Merge pull request #1255 from marauder2k9-torque/torquescript-generateCompiler

TorqueScript Generate compiler

Engine/bin/bison-flex/FlexLexer.h

@@ -0,0 +1,220 @@
+// -*-C++-*-
+// FlexLexer.h -- define interfaces for lexical analyzer classes generated
+// by flex
+
+// Copyright (c) 1993 The Regents of the University of California.
+// All rights reserved.
+//
+// This code is derived from software contributed to Berkeley by
+// Kent Williams and Tom Epperly.
+//
+//  Redistribution and use in source and binary forms, with or without
+//  modification, are permitted provided that the following conditions
+//  are met:
+
+//  1. Redistributions of source code must retain the above copyright
+//  notice, this list of conditions and the following disclaimer.
+//  2. Redistributions in binary form must reproduce the above copyright
+//  notice, this list of conditions and the following disclaimer in the
+//  documentation and/or other materials provided with the distribution.
+
+//  Neither the name of the University nor the names of its contributors
+//  may be used to endorse or promote products derived from this software
+//  without specific prior written permission.
+
+//  THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
+//  IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
+//  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+//  PURPOSE.
+
+// This file defines FlexLexer, an abstract class which specifies the
+// external interface provided to flex C++ lexer objects, and yyFlexLexer,
+// which defines a particular lexer class.
+//
+// If you want to create multiple lexer classes, you use the -P flag
+// to rename each yyFlexLexer to some other xxFlexLexer.  You then
+// include <FlexLexer.h> in your other sources once per lexer class:
+//
+//      #undef yyFlexLexer
+//      #define yyFlexLexer xxFlexLexer
+//      #include <FlexLexer.h>
+//
+//      #undef yyFlexLexer
+//      #define yyFlexLexer zzFlexLexer
+//      #include <FlexLexer.h>
+//      ...
+
+#ifndef __FLEX_LEXER_H
+// Never included before - need to define base class.
+#define __FLEX_LEXER_H
+
+#include <iostream>
+
+extern "C++" {
+
+struct yy_buffer_state;
+typedef int yy_state_type;
+
+class FlexLexer
+{
+public:
+  virtual ~FlexLexer()        { }
+
+  const char* YYText() const  { return yytext; }
+  int YYLeng()        const   { return yyleng; }
+
+  virtual void
+  yy_switch_to_buffer( yy_buffer_state* new_buffer ) = 0;
+  virtual yy_buffer_state* yy_create_buffer( std::istream* s, int size ) = 0;
+  virtual yy_buffer_state* yy_create_buffer( std::istream& s, int size ) = 0;
+  virtual void yy_delete_buffer( yy_buffer_state* b ) = 0;
+  virtual void yyrestart( std::istream* s ) = 0;
+  virtual void yyrestart( std::istream& s ) = 0;
+
+  virtual int yylex() = 0;
+
+  // Call yylex with new input/output sources.
+  int yylex( std::istream& new_in, std::ostream& new_out )
+  {
+    switch_streams( new_in, new_out );
+    return yylex();
+  }
+
+  int yylex( std::istream* new_in, std::ostream* new_out = 0)
+  {
+    switch_streams( new_in, new_out );
+    return yylex();
+  }
+
+  // Switch to new input/output streams.  A nil stream pointer
+  // indicates "keep the current one".
+  virtual void switch_streams( std::istream* new_in,
+                               std::ostream* new_out ) = 0;
+  virtual void switch_streams( std::istream& new_in,
+                               std::ostream& new_out ) = 0;
+
+  int lineno() const          { return yylineno; }
+
+  int debug() const           { return yy_flex_debug; }
+  void set_debug( int flag )  { yy_flex_debug = flag; }
+
+protected:
+  char* yytext;
+  int yyleng;
+  int yylineno;       // only maintained if you use %option yylineno
+  int yy_flex_debug;  // only has effect with -d or "%option debug"
+};
+
+}
+#endif // FLEXLEXER_H
+
+#if defined(yyFlexLexer) || ! defined(yyFlexLexerOnce)
+// Either this is the first time through (yyFlexLexerOnce not defined),
+// or this is a repeated include to define a different flavor of
+// yyFlexLexer, as discussed in the flex manual.
+# define yyFlexLexerOnce
+
+extern "C++" {
+
+class yyFlexLexer : public FlexLexer {
+public:
+  // arg_yyin and arg_yyout default to the cin and cout, but we
+  // only make that assignment when initializing in yylex().
+  yyFlexLexer( std::istream& arg_yyin, std::ostream& arg_yyout );
+  yyFlexLexer( std::istream* arg_yyin = 0, std::ostream* arg_yyout = 0 );
+private:
+  void ctor_common();
+
+public:
+
+  virtual ~yyFlexLexer();
+
+  void yy_switch_to_buffer( yy_buffer_state* new_buffer );
+  yy_buffer_state* yy_create_buffer( std::istream* s, int size );
+  yy_buffer_state* yy_create_buffer( std::istream& s, int size );
+  void yy_delete_buffer( yy_buffer_state* b );
+  void yyrestart( std::istream* s );
+  void yyrestart( std::istream& s );
+
+  void yypush_buffer_state( yy_buffer_state* new_buffer );
+  void yypop_buffer_state();
+
+  virtual int yylex();
+  virtual void switch_streams( std::istream& new_in, std::ostream& new_out );
+  virtual void switch_streams( std::istream* new_in = 0, std::ostream* new_out = 0 );
+  virtual int yywrap();
+
+protected:
+  virtual int LexerInput( char* buf, int max_size );
+  virtual void LexerOutput( const char* buf, int size );
+  virtual void LexerError( const char* msg );
+
+  void yyunput( int c, char* buf_ptr );
+  int yyinput();
+
+  void yy_load_buffer_state();
+  void yy_init_buffer( yy_buffer_state* b, std::istream& s );
+  void yy_flush_buffer( yy_buffer_state* b );
+
+  int yy_start_stack_ptr;
+  int yy_start_stack_depth;
+  int* yy_start_stack;
+
+  void yy_push_state( int new_state );
+  void yy_pop_state();
+  int yy_top_state();
+
+  yy_state_type yy_get_previous_state();
+  yy_state_type yy_try_NUL_trans( yy_state_type current_state );
+  int yy_get_next_buffer();
+
+  std::istream yyin;  // input source for default LexerInput
+  std::ostream yyout; // output sink for default LexerOutput
+
+  // yy_hold_char holds the character lost when yytext is formed.
+  char yy_hold_char;
+
+  // Number of characters read into yy_ch_buf.
+  int yy_n_chars;
+
+  // Points to current character in buffer.
+  char* yy_c_buf_p;
+
+  int yy_init;                // whether we need to initialize
+  int yy_start;               // start state number
+
+  // Flag which is used to allow yywrap()'s to do buffer switches
+  // instead of setting up a fresh yyin.  A bit of a hack ...
+  int yy_did_buffer_switch_on_eof;
+
+
+  size_t yy_buffer_stack_top; /**< index of top of stack. */
+  size_t yy_buffer_stack_max; /**< capacity of stack. */
+  yy_buffer_state ** yy_buffer_stack; /**< Stack as an array. */
+  void yyensure_buffer_stack(void);
+
+  // The following are not always needed, but may be depending
+  // on use of certain flex features (like REJECT or yymore()).
+
+  yy_state_type yy_last_accepting_state;
+  char* yy_last_accepting_cpos;
+
+  yy_state_type* yy_state_buf;
+  yy_state_type* yy_state_ptr;
+
+  char* yy_full_match;
+  int* yy_full_state;
+  int yy_full_lp;
+
+  int yy_lp;
+  int yy_looking_for_trail_begin;
+
+  int yy_more_flag;
+  int yy_more_len;
+  int yy_more_offset;
+  int yy_prev_more_offset;
+};
+
+}
+
+#endif // yyFlexLexer || ! yyFlexLexerOnce

Engine/bin/bison-flex/README.md

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+# WinFlexBison - Flex and Bison for Microsoft Windows
+
+WinFlexBison is a Windows port of [Flex (the fast lexical analyser)](https://github.com/westes/flex/) and [GNU Bison (parser generator)](https://www.gnu.org/software/bison/).
+Both win_flex and win_bison are based on upstream sources but depend on system libraries only.
+
+**NOTE**:
+* 2.4.x versions include GNU Bison version 2.7
+* 2.5.x versions include GNU Bison version 3.x.x
+
+## License
+Flex uses a [BSD license](flex/src/COPYING), GNU Bison is [licensed under the GNU General Public License (GPLv3+)](bison/src/COPYING).  
+All build scripts in WinFlexBison are distributed under GPLv3+. See [COPYING](COPYING) for details.
+
+All documentation, especially those under custom_build_rules/doc, is distributed under the GNU Free Documentation License (FDL 1.3+).
+
+## Build status
+Bison 3.x (master) [![Build status](https://ci.appveyor.com/api/projects/status/58lcjnr0mb9uc8c8/branch/master?svg=true)](https://ci.appveyor.com/project/lexxmark/winflexbison/branch/master) and, for compatibility reasons, Bison 2.7 (bison2.7) [![Build status](https://ci.appveyor.com/api/projects/status/58lcjnr0mb9uc8c8/branch/bison2.7?svg=true)](https://ci.appveyor.com/project/lexxmark/winflexbison/branch/bison2.7)
+
+## Downloads
+https://github.com/lexxmark/winflexbison/releases provides stable versions.
+To test non-released development versions see the artifacts provided by CI under "Build status".
+
+## Changelog
+The release page includes the full Changelog but you may also see the [changelog.md](changelog.md) file.
+
+## Build requirements
+* Visual Studio 2017 or newer
+* optional: CMake (when building with CMake)
+
+## HowTo
+You may use win_flex and win_bison directly on the command line or [use them via CustomBuildRules in VisualStudio](custom_build_rules/README.md).
+
+## Example flex/bison files
+See https://github.com/meyerd/flex-bison-example

Engine/bin/bison-flex/changelog.md

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+## Changelog
+
+**NOTE**:
+  * 2.4.x versions include bison version 2.7
+  * 2.5.x versions include bison version 3.x
+  
+### version 2.5.25
+  * upgrade win_bison to version 3.8.2
+  * upgrade m4 to version 1.4.19
+
+### version 2.5.24
+  * upgrade win_bison to version 3.7.4
+  * upgrade m4 to version 1.4.18
+  * upgrade gnulib
+  * removed VS2015 support
+  * fixed win_bison --update option (renaming opened file)
+
+### version 2.5.23
+  * upgrade win_bison to version 3.7.1
+
+### version 2.5.22
+  * upgrade win_bison to version 3.5.0
+
+### version 2.5.21
+  * avoid _m4eof lines in generated bison code while printing warnings
+
+### version 2.5.20
+  * recovered invoking win_bison from different folders
+
+### version 2.5.19
+  * upgrade win_bison to version 3.4.1
+  
+### version 2.5.18
+  * upgrade win_bison to version 3.3.2
+
+### version 2.5.17
+  * upgrade win_bison to version 3.3.1
+
+### version 2.5.16
+  * upgrade win_bison to version 3.1
+  * write output flex/bison files in binary mode "wb" that means use '\n' EOL not '\r\n'
+  * documentation about how to use the custom build-rules is now included
+
+### versions 2.4.12/2.5.15
+  * upgrade win_bison to version 3.0.5
+
+### versions 2.4.12/2.5.14
+  * revert to Visual Studio 2015 due to false positive virus alarms for win_flex.exe
+
+### versions 2.4.11/2.5.13
+  * fixed VS 2017 compilation errors in location.cc
+
+### versions 2.4.11/2.5.12
+  * migrate to Visual Studio 2017
+
+### versions 2.4.10/2.5.11
+  * upgrade win_flex to version 2.6.4
+  * fixed compilation warnings
+
+### versions 2.4.9/2.5.10
+  * data folder was up to dated for bison 3.0.4
+
+### versions 2.4.9/2.5.9
+  * recovered --header-file win_flex option
+
+### versions 2.4.8/2.5.8
+  * fixed outdated FlexLexer.h file
+
+### versions 2.4.7/2.5.7
+  * upgrade win_flex to version 2.6.3
+  * fixed compilation warnings
+
+### versions 2.4.6/2.5.6
+  * upgrade win_bison to version 3.0.4
+  * win_bison v2.7 is unchanged
+  * add separate custom build rules
+    * for win_bison `custom_build_rules\win_bison_only`
+    * and win_flex `custom_build_rules\win_flex_only`
+
+### versions 2.4.5/2.5.5
+  * fix missing Additional Options in custom build rules
+  * fix incorrect "----header-file" option in flex custom build rules
+  * add some extra flex options to Visual Studio property pages:
+     1. Prefix (--prefix="...")
+     2. C++ Class Name (--yyclass="...")
+
+###versions 2.4.4/2.5.4
+  * fix silent errors in custom build rules
+  * add some flex/bison options to Visual Studio property pages:
+  * Bison:
+     1. Output File Name (--output="...")
+     2. Defines File Name (--defines="...")
+     3. Debug (--debug)
+     4. Verbose (--verbose)
+     5. No lines (--no-lines)
+     6. File Prefix (--file-prefix="...")
+     7. Graph File (--graph="...")
+     8. Warnings (--warnings="...")
+     9. Report (--report="...")
+     10. Report File Name (--report-file="...")
+
+  * Flex:
+     1. Output File Name (--outfile="...")
+     2. Header File Name (--header-file="...")
+     3. Windows compatibility mode (--wincompat)
+     4. Case-insensitive mode (--case-insensitive)
+     5. Lex-compatibility mode (--lex-compat)
+     6. Start Condition Stacks (--stack)
+     7. Bison Bridge Mode (--bison-bridge)
+     8. No #line Directives (--noline)
+     9. Generate Reentrant Scanner (--reentrant)
+     10. Generate C++ Scanner (--c++)
+     11. Debug Mode (--debug)
+
+### versions 2.4.3/2.5.3
+  * fix incorrect #line directives in win_flex.exe
+see https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=542482
+
+### versions 2.4.2/2.5.2
+  * backport parallel invocations of win_bison version 2.7
+  * win_bison of version 3.0 is unchanged
+
+### versions 2.4.1/2.5.1
+  * remove XSI extention syntax for fprintf function (not implemented in windows)
+  * this fixes Graphviz files generation for bison
+
+**NOTE**:
+  * 2.4.x versions will include bison version 2.7
+  * 2.5.x versions will include bison version 3.0
+
+### version 2.5
+  * upgrade win_bison to version 3.0 and make temporary win_bison's files process unique (so parallel invocations of win_bison are possible)
+
+**NOTE**: Several deprecated features were removed in bison 3.0 so this version can break your projects.
+Please see http://savannah.gnu.org/forum/forum.php?forum_id=7663
+For the reason of compatibility I don't change win_flex_bison-latest.zip to refer to win_flex_bison-2.5.zip file.
+It still refer to win_flex_bison-2.4.zip
+
+### version 2.4
+  * fix problem with "m4_syscmd is not implemented" message.
+  * Now win_bison should output correct diagnostic and error messages.
+
+### version 2.3
+  * hide __attribute__ construction for non GCC compilers
+
+### version 2.2
+  * added --wincompat option to win_flex (this option changes `<unistd.h>` unix include with `<io.h>` windows analog
+  also `isatty/fileno` functions changed to `_isatty/_fileno`)
+fixed two "'<' : signed/unsigned mismatch" warnings in win_flex generated file
+
+### version 2.1
+  * fixed crash when execute win_bison.exe under WindowsXP (argv[0] don't have full application path)
+  * added win_flex_bison-latest.zip package to freeze download link
+
+### version 2.0
+  * upgrade win_bison to version 2.7 and win_flex to version 2.5.37
+
+### version 1.2
+  * fixed win_flex.exe #line directives (some #line directives in output file were with unescaped backslashes)
+
+### version 1.1
+  * fixed win_flex.exe parallel invocations (now all temporary files are process specific)
+  * added FLEX_TMP_DIR environment variable support to redirect temporary files folder
+  * added '.exe' to program name in win_flex.exe --version output (CMake support)
+  * fixed win_bison.exe to use "/data" subfolder related to executable path rather than current working directory
+  * added BISON_PKGDATADIR environment variable to redirect "/data" subfolder to a different place

Engine/bin/bison-flex/custom_build_rules/README.md

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+
+How to setup custom build rules for Visual Studio 2010 and up.
+---------------
+
+First of all you should have the necessary files.
+Custom Build rules are separated into a file triplet of `.xml`, `.targets` and `.props`.
+
+You find the custom build rules for win_flex_bison in the **custom_build_rules** directory of the win_flex_bison archive.
+
+You may choose to install one of the following rule set
+
+* the combined rules - [alternative download][1]:
+    * [win_flex_bison_custom_build.props  ](win_flex_bison/win_flex_bison_custom_build.props)
+    * [win_flex_bison_custom_build.targets](win_flex_bison/win_flex_bison_custom_build.targets)
+    * [win_flex_bison_custom_build.xml    ](win_flex_bison/win_flex_bison_custom_build.xml)
+
+* flex only rules   - [alternative download][2]:
+    * [win_flex_custom_build.props        ](win_flex_only/win_flex_custom_build.props)
+    * [win_flex_custom_build.targets      ](win_flex_only/win_flex_custom_build.targets)
+    * [win_flex_custom_build.xml          ](win_flex_only/win_flex_custom_build.xml)
+
+* bison only rules  - [alternative download][3]:
+    * [win_bison_custom_build.props  ](win_bison_only/win_bison_custom_build.props)
+    * [win_bison_custom_build.targets](win_bison_only/win_bison_custom_build.targets)
+    * [win_bison_custom_build.xml    ](win_bison_only/win_bison_custom_build.xml)
+
+This documentation uses the combined rule-set but can be used for all rule-sets.
+
+[1]: https://sourceforge.net/projects/winflexbison/files/win_flex_bison_custom_build_rules.zip/download "Combined build rules for Bison and Flex"
+[2]: https://sourceforge.net/projects/winflexbison/files/win_flex_custom_build_rules.zip/download "Build rules for Flex only"
+[3]: https://sourceforge.net/projects/winflexbison/files/win_bison_custom_build_rules.zip/download "Build rules for Bison only"
+
+----
+
+Launch Visual Studio and open an VC/VC++ project.
+Open context menu for project item in Solution Explorer panel and select "**Build Customizations...**" menu item.
+(Note: newer VS versions have this below sub-menu "**Build Dependencies...**".)
+
+![Build Customizations in Solution Explorer](docs/1.png)
+
+----
+
+In popup dialog "Visual C++ Build Customization Files" press "**Find Existing...**" button.
+
+![Customization Files](docs/2.png)
+
+----
+
+In Open File dialog select "**win_flex_bison_custom_build.targets**" file and press "Open".
+(Note: you may have to switch the file filter to "(*.*) all files".)
+
+----
+
+You will see "Add Search Path?" message box, press "Yes".
+
+![Adding Search Path](docs/3.png)
+
+----
+
+In "Visual C++ Build Customization Files" dialog check just added item **win_flex_bison_custom_build** and press "OK".
+
+![activate custom build rule](docs/4.png)
+
+----
+
+Now you can add flex and bison files to the project...
+
+![project with flex and bison files added](docs/5.png)
+
+... and build.
+In build output you should see something like this:
+
+~~~~
+
+1>------ Rebuild All started: Project: ConsoleApplication1, Configuration: Debug Win32 ------
+1>  Process sample bison file
+1>  Process sample flex file
+1>  stdafx.cpp
+1>  ConsoleApplication1.cpp
+1>  Generating Code...
+1>  ConsoleApplication1.vcxproj -> C:\Users\ConsoleApplication1\Debug\ConsoleApplication1.exe
+========== Rebuild All: 1 succeeded, 0 failed, 0 skipped ==========
+
+~~~~
+
+-----
+
+For **sample.y** bison file there are two output files: **sample.tab.h** and **sample.tab.cpp**.
+For **sample.l** flex file you'll got **sample.flex.cpp**.
+
+Now you can add them to the project and build. (*Don't forget to exclude cpp files from using precompiled headers*)
+
+![Include generated files into Solution](docs/6.png)
+
+~~~~
+
+1>------ Build started: Project: ConsoleApplication1, Configuration: Debug Win32 ------
+1>  Process sample bison file
+1>  Process sample flex file
+1>  sample.tab.cpp
+1>  sample.flex.cpp
+1>  Generating Code...
+1>  ConsoleApplication1.vcxproj -> C:\Users\ConsoleApplication1\Debug\ConsoleApplication1.exe
+========== Build: 1 succeeded, 0 failed, 0 up-to-date, 0 skipped ==========
+
+~~~~
+
+----
+
+If your flex/bison file is incorrect and you've got an error. But you don't see actual error message, something like this:
+
+~~~~
+
+1>------ Build started: Project: ConsoleApplication2, Configuration: Debug Win32 ------
+1>  Process "grammar.y" bison file
+1>C:...\custom_build_rules\win_flex_bison_custom_build.targets(55,5): error MSB3721: The command "
+1>C:...\custom_build_rules\win_flex_bison_custom_build.targets(55,5): error MSB3721: start /B /WAIT /D "C:...\ConsoleApplication2\ConsoleApplication2\" win_bison.exe --output="grammar.tab.cpp" --defines="grammar.tab.h" --graph="1.dot" "grammar.y"
+1>C:...\custom_build_rules\win_flex_bison_custom_build.targets(55,5): error MSB3721: exit /b %errorlevel%" exited with code 1.
+========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
+
+~~~~
+
+You can change Build Output Verbosity from "Minimal" to "Normal" in "Options" dialog
+
+![Verbosity](docs/Verbosity.png)
+
+Then you will see more detailed output:
+
+~~~~
+
+1>BisonTarget:
+1>  Process "grammar.y" bison file
+1>  grammar.y:51.1-4: error: invalid directive: '%sdw'
+1>C:...\custom_build_rules\win_flex_bison_custom_build.targets(55,5): error MSB3721: The command "
+1>C:...\custom_build_rules\win_flex_bison_custom_build.targets(55,5): error MSB3721: start /B /WAIT /D "C:...\ConsoleApplication2\" win_bison.exe --output="grammar.tab.cpp" --defines="grammar.tab.h" --graph="1.dot" "grammar.y"
+1>C:...\custom_build_rules\win_flex_bison_custom_build.targets(55,5): error MSB3721: exit /b %errorlevel%" exited with code 1.
+1>
+1>Build FAILED.
+1>
+1>Time Elapsed 00:00:01.21
+========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
+
+~~~~
+
+----
+
+Also you can tune some flex/bison options in files properties dialog:
+
+![Opening File Properties](docs/Properties.png)
+![Property Page for Flex sources](docs/FlexProperties.png)
+![Property Page for Bison sources](docs/BisonProperties.png)
+
+----
+
+
+To debug your scanner or parser you can set break points right into **sample.y** or **sample.l** code.
+
+![Debugging Flex source files](docs/Flex_debuging.png)
+
+----
+
+
+To use the Visual C++ Code editor for Flex/Bison files instead of the text editor adjust your editor settings as follows:
+
+* click **Options** on the **Tools** menu, expand the **Text Editor** node and select **File Extension**
+* type extension **`l`** in the **Extension** field and choose **Microsoft Visual C++** in the **Editor** drop-down field, click **Add**
+* do the same for the extension **`y`**
+
+You now have syntax highlighting, code-completion and show definition options in your Flex/Bison source.
+
+----
+
+Enjoy!

Engine/bin/bison-flex/custom_build_rules/win_bison_only/win_bison_custom_build.props

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup
+    Condition="'$(BisonBeforeTargets)' == '' and '$(BisonAfterTargets)' == '' and '$(ConfigurationType)' != 'Makefile'">
+    <BisonBeforeTargets>Midl</BisonBeforeTargets>
+    <BisonAfterTargets>CustomBuild</BisonAfterTargets>
+  </PropertyGroup>
+  <PropertyGroup>
+    <BisonDependsOn
+      Condition="'$(ConfigurationType)' != 'Makefile'">_SelectedFiles;$(BisonDependsOn)</BisonDependsOn>
+  </PropertyGroup>
+  <ItemDefinitionGroup>
+    <Bison>
+      <OutputFile>%(Filename).tab.cpp</OutputFile>
+      <DefinesFile>%(Filename).tab.h</DefinesFile>
+      <CommandLineTemplate>
+start /B /WAIT /D "%(RootDir)%(Directory)" win_bison.exe [AllOptions] [AdditionalOptions] "%(Filename)%(Extension)"
+exit /b %errorlevel%</CommandLineTemplate>
+      <Outputs>%(RootDir)%(Directory)%(OutputFile);%(RootDir)%(Directory)%(DefinesFile);</Outputs>
+      <ExecutionDescription>Process "%(Filename)%(Extension)" bison file</ExecutionDescription>
+    </Bison>
+  </ItemDefinitionGroup>
+</Project>

Engine/bin/bison-flex/custom_build_rules/win_bison_only/win_bison_custom_build.targets

@@ -0,0 +1,91 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <PropertyPageSchema
+      Include="$(MSBuildThisFileDirectory)$(MSBuildThisFileName).xml" />
+    <AvailableItemName
+      Include="Bison">
+      <Targets>BisonTarget</Targets>
+    </AvailableItemName>
+  </ItemGroup>
+  <UsingTask
+    TaskName="Bison"
+    TaskFactory="XamlTaskFactory"
+    AssemblyName="Microsoft.Build.Tasks.v4.0">
+    <Task>$(MSBuildThisFileDirectory)$(MSBuildThisFileName).xml</Task>
+  </UsingTask>
+  <Target
+    Name="BisonTarget"
+    BeforeTargets="$(BisonBeforeTargets)"
+    AfterTargets="$(BisonAfterTargets)"
+    Condition="'@(Bison)' != ''"
+    DependsOnTargets="$(BisonDependsOn);ComputeBisonOutput"
+    Outputs="%(Bison.Outputs)"
+    Inputs="%(Bison.Identity);%(Bison.AdditionalDependencies);$(MSBuildProjectFile)">
+    <ItemGroup
+      Condition="'@(SelectedFiles)' != ''">
+      <Bison
+        Remove="@(Bison)"
+        Condition="'%(Identity)' != '@(SelectedFiles)'" />
+    </ItemGroup>
+    <ItemGroup>
+      <Bison_tlog
+        Include="%(Bison.Outputs)"
+        Condition="'%(Bison.Outputs)' != '' and '%(Bison.ExcludedFromBuild)' != 'true'">
+        <Source>@(Bison, '|')</Source>
+      </Bison_tlog>
+    </ItemGroup>
+    <Message
+      Importance="High"
+      Text="%(Bison.ExecutionDescription)" />
+    <WriteLinesToFile
+      Condition="'@(Bison_tlog)' != '' and '%(Bison_tlog.ExcludedFromBuild)' != 'true'"
+      File="$(IntDir)$(ProjectName).write.1.tlog"
+      Lines="^%(Bison_tlog.Source);@(Bison_tlog-&gt;'%(Fullpath)')" />
+    <Bison
+      Condition="'@(Bison)' != '' and '%(Bison.ExcludedFromBuild)' != 'true'"
+      CommandLineTemplate="%(Bison.CommandLineTemplate)"
+      OutputFile="%(Bison.OutputFile)"
+      DefinesFile="%(Bison.DefinesFile)"
+      Debug="%(Bison.Debug)"
+      Verbose="%(Bison.Verbose)"
+      NoLines="%(Bison.NoLines)"
+      FilePrefix="%(Bison.FilePrefix)"
+      GraphFile="%(Bison.GraphFile)"
+      Warnings="%(Bison.Warnings)"
+      Report="%(Bison.Report)"
+      ReportFile="%(Bison.ReportFile)"
+      AdditionalOptions="%(Bison.AdditionalOptions)"
+      Inputs="%(Bison.Identity)" />
+  </Target>
+  <PropertyGroup>
+    <ComputeLinkInputsTargets>
+            $(ComputeLinkInputsTargets);
+            ComputeBisonOutput;
+          </ComputeLinkInputsTargets>
+    <ComputeLibInputsTargets>
+            $(ComputeLibInputsTargets);
+            ComputeBisonOutput;
+          </ComputeLibInputsTargets>
+  </PropertyGroup>
+  <Target
+    Name="ComputeBisonOutput"
+    Condition="'@(Bison)' != ''">
+    <ItemGroup>
+      <BisonDirsToMake
+        Condition="'@(Bison)' != '' and '%(Bison.ExcludedFromBuild)' != 'true'"
+        Include="%(Bison.Outputs)" />
+      <Link
+        Include="%(BisonDirsToMake.Identity)"
+        Condition="'%(Extension)'=='.obj' or '%(Extension)'=='.res' or '%(Extension)'=='.rsc' or '%(Extension)'=='.lib'" />
+      <Lib
+        Include="%(BisonDirsToMake.Identity)"
+        Condition="'%(Extension)'=='.obj' or '%(Extension)'=='.res' or '%(Extension)'=='.rsc' or '%(Extension)'=='.lib'" />
+      <ImpLib
+        Include="%(BisonDirsToMake.Identity)"
+        Condition="'%(Extension)'=='.obj' or '%(Extension)'=='.res' or '%(Extension)'=='.rsc' or '%(Extension)'=='.lib'" />
+    </ItemGroup>
+    <MakeDir
+      Directories="@(BisonDirsToMake-&gt;'%(RootDir)%(Directory)')" />
+  </Target>
+</Project>

Engine/bin/bison-flex/custom_build_rules/win_bison_only/win_bison_custom_build.xml

@@ -0,0 +1,281 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ProjectSchemaDefinitions xmlns="clr-namespace:Microsoft.Build.Framework.XamlTypes;assembly=Microsoft.Build.Framework" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:sys="clr-namespace:System;assembly=mscorlib" xmlns:transformCallback="Microsoft.Cpp.Dev10.ConvertPropertyCallback">
+  <Rule
+    Name="Bison"
+    PageTemplate="tool"
+    DisplayName="Bison files"
+    SwitchPrefix="--"
+    Order="200">
+    <Rule.DataSource>
+      <DataSource
+        Persistence="ProjectFile"
+        ItemType="Bison" />
+    </Rule.DataSource>
+    <Rule.Categories>
+      <Category
+        Name="General">
+        <Category.DisplayName>
+          <sys:String>General</sys:String>
+        </Category.DisplayName>
+      </Category>
+      <Category
+        Name="Bison Options">
+        <Category.DisplayName>
+          <sys:String>Bison Options</sys:String>
+        </Category.DisplayName>
+      </Category>
+      <Category
+        Name="Command Line"
+        Subtype="CommandLine">
+        <Category.DisplayName>
+          <sys:String>Command Line</sys:String>
+        </Category.DisplayName>
+      </Category>
+    </Rule.Categories>
+
+    <StringListProperty
+      Name="OutputFile"
+      Category="Bison Options"
+      IsRequired="true"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Bison-Options.html#Bison-Options"
+      DisplayName="Output File Name"
+      Description="Specify the file for the parser implementation file. --output=value"
+      Switch="output=&quot;[value]&quot;"
+      />
+
+    <StringListProperty
+      Name="DefinesFile"
+      Category="Bison Options"
+      Subtype="file"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Bison-Options.html#Bison-Options"
+      DisplayName="Defines File Name"
+      Description="Pretend that %defines was specified, i.e., write an extra output file containing macro definitions for the token type names defined in the grammar, as well as a few other declarations. --defines=value"
+      Switch="defines=&quot;[value]&quot;"
+      />
+    
+    <BoolProperty
+      Name="Debug"
+      Category="Bison Options"
+      DisplayName="Debug"
+      Description="In the parser implementation file, define the macro YYDEBUG to 1 if it is not already defined, so that the debugging facilities are compiled. (--debug)"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Enabling-Traces.html#Enabling-Traces"
+      Switch="debug" />
+    
+    <BoolProperty
+      Name="Verbose"
+      Category="Bison Options"
+      DisplayName="Verbose"
+      Description="Write an extra output file containing verbose descriptions of the parser states and what is done for each type of lookahead token in that state. (--verbose)"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Understanding.html#Understanding"
+      Switch="verbose" />
+
+    <BoolProperty
+      Name="NoLines"
+      Category="Bison Options"
+      DisplayName="No lines"
+      Description="Don’t put any #line preprocessor commands in the parser implementation file. (--no-lines)"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Bison-Options.html#Bison-Options"
+      Switch="no-lines" />
+
+    <StringListProperty
+      Name="FilePrefix"
+      Category="Bison Options"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Bison-Options.html#Bison-Options"
+      DisplayName="File Prefix"
+      Description="Pretend that %file-prefix was specified, i.e., specify prefix to use for all Bison output file names. --file-prefix=prefix"
+      Switch="file-prefix=&quot;[value]&quot;"
+      />
+
+    <StringListProperty
+      Name="GraphFile"
+      Category="Bison Options"
+      Subtype="file"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Bison-Options.html#Bison-Options"
+      DisplayName="Graph File"
+      Description="Output a graphical representation of the parser’s automaton computed by Bison, in Graphviz DOT format. --graph=file"
+      Switch="graph=&quot;[value]&quot;"
+      />
+
+    <EnumProperty
+      Name="Warnings"
+      Category="Bison Options"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Bison-Options.html#Bison-Options"
+      DisplayName="Warnings"
+      Description="Output warnings falling in category. (--warnings=category)">
+
+      <EnumValue
+        Name="midrule-values"
+        DisplayName="midrule-values"
+        Switch="warnings=midrule-values"/>
+      <EnumValue
+        Name="yacc"
+        DisplayName="yacc"
+        Switch="warnings=yacc"/>
+      <EnumValue
+        Name="conflicts-sr"
+        DisplayName="conflicts-sr"
+        Switch="warnings=conflicts-sr"/>
+      <EnumValue
+        Name="conflicts-rr"
+        DisplayName="conflicts-rr"
+        Switch="warnings=conflicts-rr"/>
+      <EnumValue
+        Name="other"
+        DisplayName="other"
+        Switch="warnings=other"/>
+      <EnumValue
+        Name="all"
+        DisplayName="all"
+        Switch="warnings=all"/>
+      <EnumValue
+        Name="none"
+        DisplayName="none"
+        Switch="warnings=none"/>
+      <EnumValue
+        Name="error"
+        DisplayName="error"
+        Switch="warnings=error"/>
+    </EnumProperty>
+
+    <EnumProperty
+      Name="Report"
+      Category="Bison Options"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Bison-Options.html#Bison-Options"
+      DisplayName="Report"
+      Description="Write an extra output file containing verbose description of the comma separated list of things. (--report=things)">
+      
+      <EnumValue
+        Name="state"
+        DisplayName="state"
+        Switch="report=state"/>
+      <EnumValue
+        Name="itemset"
+        DisplayName="itemset"
+        Switch="report=itemset"/>
+      <EnumValue
+        Name="lookahead"
+        DisplayName="lookahead"
+        Switch="report=lookahead"/>
+      <EnumValue
+        Name="solved"
+        DisplayName="solved"
+        Switch="report=solved"/>
+      <EnumValue
+        Name="all"
+        DisplayName="all"
+        Switch="report=all"/>
+      <EnumValue
+        Name="none"
+        DisplayName="none"
+        Switch="report=none"/>
+    </EnumProperty>
+
+    <StringListProperty
+      Name="ReportFile"
+      Category="Bison Options"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Bison-Options.html#Bison-Options"
+      DisplayName="Report File Name"
+      Description="Specify the file for the verbose description. --report-file=value"
+      Switch="report-file=&quot;[value]&quot;"
+      />
+
+    <StringListProperty
+      Name="Inputs"
+      Category="Command Line"
+      IsRequired="true"
+      Switch=" ">
+      <StringListProperty.DataSource>
+        <DataSource
+          Persistence="ProjectFile"
+          ItemType="Bison"
+          SourceType="Item" />
+      </StringListProperty.DataSource>
+    </StringListProperty>
+    <StringProperty
+      Name="CommandLineTemplate"
+      DisplayName="Command Line"
+      Visible="False"
+      IncludeInCommandLine="False" />
+    <DynamicEnumProperty
+      Name="BisonBeforeTargets"
+      Category="General"
+      EnumProvider="Targets"
+      IncludeInCommandLine="False">
+      <DynamicEnumProperty.DisplayName>
+        <sys:String>Execute Before</sys:String>
+      </DynamicEnumProperty.DisplayName>
+      <DynamicEnumProperty.Description>
+        <sys:String>Specifies the targets for the build customization to run before.</sys:String>
+      </DynamicEnumProperty.Description>
+      <DynamicEnumProperty.ProviderSettings>
+        <NameValuePair
+          Name="Exclude"
+          Value="^BisonBeforeTargets|^Compute" />
+      </DynamicEnumProperty.ProviderSettings>
+      <DynamicEnumProperty.DataSource>
+        <DataSource
+          Persistence="ProjectFile"
+          HasConfigurationCondition="true" />
+      </DynamicEnumProperty.DataSource>
+    </DynamicEnumProperty>
+    <DynamicEnumProperty
+      Name="BisonAfterTargets"
+      Category="General"
+      EnumProvider="Targets"
+      IncludeInCommandLine="False">
+      <DynamicEnumProperty.DisplayName>
+        <sys:String>Execute After</sys:String>
+      </DynamicEnumProperty.DisplayName>
+      <DynamicEnumProperty.Description>
+        <sys:String>Specifies the targets for the build customization to run after.</sys:String>
+      </DynamicEnumProperty.Description>
+      <DynamicEnumProperty.ProviderSettings>
+        <NameValuePair
+          Name="Exclude"
+          Value="^BisonAfterTargets|^Compute" />
+      </DynamicEnumProperty.ProviderSettings>
+      <DynamicEnumProperty.DataSource>
+        <DataSource
+          Persistence="ProjectFile"
+          ItemType=""
+          HasConfigurationCondition="true" />
+      </DynamicEnumProperty.DataSource>
+    </DynamicEnumProperty>
+    <StringListProperty
+      Name="Outputs"
+      DisplayName="Outputs"
+      Visible="False"
+      IncludeInCommandLine="False" />
+    <StringProperty
+      Name="ExecutionDescription"
+      DisplayName="Execution Description"
+      Visible="False"
+      IncludeInCommandLine="False" />
+    <StringListProperty
+      Name="AdditionalDependencies"
+      DisplayName="Additional Dependencies"
+      IncludeInCommandLine="False"
+      Visible="false" />
+    <StringProperty
+      Subtype="AdditionalOptions"
+      Name="AdditionalOptions"
+      Category="Command Line">
+      <StringProperty.DisplayName>
+        <sys:String>Additional Options</sys:String>
+      </StringProperty.DisplayName>
+      <StringProperty.Description>
+        <sys:String>Additional Options</sys:String>
+      </StringProperty.Description>
+    </StringProperty>
+  </Rule>
+  <ItemType
+    Name="Bison"
+    DisplayName="Bison files" />
+  <FileExtension
+    Name="*.y"
+    ContentType="Bison" />
+  <ContentType
+    Name="Bison"
+    DisplayName="Bison files"
+    ItemType="Bison" />
+  </ProjectSchemaDefinitions>

Engine/bin/bison-flex/custom_build_rules/win_flex_bison/win_flex_bison_custom_build.props

@@ -0,0 +1,43 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup
+    Condition="'$(BisonBeforeTargets)' == '' and '$(BisonAfterTargets)' == '' and '$(ConfigurationType)' != 'Makefile'">
+    <BisonBeforeTargets>Midl</BisonBeforeTargets>
+    <BisonAfterTargets>CustomBuild</BisonAfterTargets>
+  </PropertyGroup>
+  <PropertyGroup>
+    <BisonDependsOn
+      Condition="'$(ConfigurationType)' != 'Makefile'">_SelectedFiles;$(BisonDependsOn)</BisonDependsOn>
+  </PropertyGroup>
+  <ItemDefinitionGroup>
+    <Bison>
+      <OutputFile>%(Filename).tab.cpp</OutputFile>
+      <DefinesFile>%(Filename).tab.h</DefinesFile>
+      <CommandLineTemplate>
+start /B /WAIT /D "%(RootDir)%(Directory)" win_bison.exe [AllOptions] [AdditionalOptions] "%(Filename)%(Extension)"
+exit /b %errorlevel%</CommandLineTemplate>
+      <Outputs>%(RootDir)%(Directory)%(OutputFile);%(RootDir)%(Directory)%(DefinesFile);</Outputs>
+      <ExecutionDescription>Process "%(Filename)%(Extension)" bison file</ExecutionDescription>
+    </Bison>
+  </ItemDefinitionGroup>
+  <PropertyGroup
+    Condition="'$(FlexBeforeTargets)' == '' and '$(FlexAfterTargets)' == '' and '$(ConfigurationType)' != 'Makefile'">
+    <FlexBeforeTargets>Midl</FlexBeforeTargets>
+    <FlexAfterTargets>CustomBuild</FlexAfterTargets>
+  </PropertyGroup>
+  <PropertyGroup>
+    <FlexDependsOn
+      Condition="'$(ConfigurationType)' != 'Makefile'">_SelectedFiles;$(FlexDependsOn)</FlexDependsOn>
+  </PropertyGroup>
+  <ItemDefinitionGroup>
+    <Flex>
+      <OutputFile>%(Filename).flex.cpp</OutputFile>
+      <Wincompat>true</Wincompat>
+      <CommandLineTemplate>
+start /B /WAIT /D "%(RootDir)%(Directory)" win_flex.exe [AllOptions] [AdditionalOptions] "%(Filename)%(Extension)"
+exit /b %errorlevel%</CommandLineTemplate>
+      <Outputs>%(RootDir)%(Directory)%(OutputFile);</Outputs>
+      <ExecutionDescription>Process "%(Filename)%(Extension)" flex file</ExecutionDescription>
+    </Flex>
+  </ItemDefinitionGroup>
+</Project>

Engine/bin/bison-flex/custom_build_rules/win_flex_bison/win_flex_bison_custom_build.targets

@@ -0,0 +1,178 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <PropertyPageSchema
+      Include="$(MSBuildThisFileDirectory)$(MSBuildThisFileName).xml" />
+    <AvailableItemName
+      Include="Bison">
+      <Targets>BisonTarget</Targets>
+    </AvailableItemName>
+    <AvailableItemName
+      Include="Flex">
+      <Targets>FlexTarget</Targets>
+    </AvailableItemName>
+  </ItemGroup>
+  <UsingTask
+    TaskName="Bison"
+    TaskFactory="XamlTaskFactory"
+    AssemblyName="Microsoft.Build.Tasks.v4.0">
+    <Task>$(MSBuildThisFileDirectory)$(MSBuildThisFileName).xml</Task>
+  </UsingTask>
+  <UsingTask
+    TaskName="Flex"
+    TaskFactory="XamlTaskFactory"
+    AssemblyName="Microsoft.Build.Tasks.v4.0">
+    <Task>$(MSBuildThisFileDirectory)$(MSBuildThisFileName).xml</Task>
+  </UsingTask>
+  <Target
+    Name="BisonTarget"
+    BeforeTargets="$(BisonBeforeTargets)"
+    AfterTargets="$(BisonAfterTargets)"
+    Condition="'@(Bison)' != ''"
+    DependsOnTargets="$(BisonDependsOn);ComputeBisonOutput"
+    Outputs="%(Bison.Outputs)"
+    Inputs="%(Bison.Identity);%(Bison.AdditionalDependencies);$(MSBuildProjectFile)">
+    <ItemGroup
+      Condition="'@(SelectedFiles)' != ''">
+      <Bison
+        Remove="@(Bison)"
+        Condition="'%(Identity)' != '@(SelectedFiles)'" />
+    </ItemGroup>
+    <ItemGroup>
+      <Bison_tlog
+        Include="%(Bison.Outputs)"
+        Condition="'%(Bison.Outputs)' != '' and '%(Bison.ExcludedFromBuild)' != 'true'">
+        <Source>@(Bison, '|')</Source>
+      </Bison_tlog>
+    </ItemGroup>
+    <Message
+      Importance="High"
+      Text="%(Bison.ExecutionDescription)" />
+    <WriteLinesToFile
+      Condition="'@(Bison_tlog)' != '' and '%(Bison_tlog.ExcludedFromBuild)' != 'true'"
+      File="$(IntDir)$(ProjectName).write.1.tlog"
+      Lines="^%(Bison_tlog.Source);@(Bison_tlog-&gt;'%(Fullpath)')" />
+    <Bison
+      Condition="'@(Bison)' != '' and '%(Bison.ExcludedFromBuild)' != 'true'"
+      CommandLineTemplate="%(Bison.CommandLineTemplate)"
+      OutputFile="%(Bison.OutputFile)"
+      DefinesFile="%(Bison.DefinesFile)"
+      Debug="%(Bison.Debug)"
+      Verbose="%(Bison.Verbose)"
+      NoLines="%(Bison.NoLines)"
+      FilePrefix="%(Bison.FilePrefix)"
+      GraphFile="%(Bison.GraphFile)"
+      Warnings="%(Bison.Warnings)"
+      Report="%(Bison.Report)"
+      ReportFile="%(Bison.ReportFile)"
+      AdditionalOptions="%(Bison.AdditionalOptions)"
+      Inputs="%(Bison.Identity)" />
+  </Target>
+  <PropertyGroup>
+    <ComputeLinkInputsTargets>
+            $(ComputeLinkInputsTargets);
+            ComputeBisonOutput;
+          </ComputeLinkInputsTargets>
+    <ComputeLibInputsTargets>
+            $(ComputeLibInputsTargets);
+            ComputeBisonOutput;
+          </ComputeLibInputsTargets>
+  </PropertyGroup>
+  <Target
+    Name="ComputeBisonOutput"
+    Condition="'@(Bison)' != ''">
+    <ItemGroup>
+      <BisonDirsToMake
+        Condition="'@(Bison)' != '' and '%(Bison.ExcludedFromBuild)' != 'true'"
+        Include="%(Bison.Outputs)" />
+      <Link
+        Include="%(BisonDirsToMake.Identity)"
+        Condition="'%(Extension)'=='.obj' or '%(Extension)'=='.res' or '%(Extension)'=='.rsc' or '%(Extension)'=='.lib'" />
+      <Lib
+        Include="%(BisonDirsToMake.Identity)"
+        Condition="'%(Extension)'=='.obj' or '%(Extension)'=='.res' or '%(Extension)'=='.rsc' or '%(Extension)'=='.lib'" />
+      <ImpLib
+        Include="%(BisonDirsToMake.Identity)"
+        Condition="'%(Extension)'=='.obj' or '%(Extension)'=='.res' or '%(Extension)'=='.rsc' or '%(Extension)'=='.lib'" />
+    </ItemGroup>
+    <MakeDir
+      Directories="@(BisonDirsToMake-&gt;'%(RootDir)%(Directory)')" />
+  </Target>
+  <Target
+    Name="FlexTarget"
+    BeforeTargets="$(FlexBeforeTargets)"
+    AfterTargets="$(FlexAfterTargets)"
+    Condition="'@(Flex)' != ''"
+    DependsOnTargets="$(FlexDependsOn);ComputeFlexOutput"
+    Outputs="%(Flex.Outputs)"
+    Inputs="%(Flex.Identity);%(Flex.AdditionalDependencies);$(MSBuildProjectFile)">
+    <ItemGroup
+      Condition="'@(SelectedFiles)' != ''">
+      <Flex
+        Remove="@(Flex)"
+        Condition="'%(Identity)' != '@(SelectedFiles)'" />
+    </ItemGroup>
+    <ItemGroup>
+      <Flex_tlog
+        Include="%(Flex.Outputs)"
+        Condition="'%(Flex.Outputs)' != '' and '%(Flex.ExcludedFromBuild)' != 'true'">
+        <Source>@(Flex, '|')</Source>
+      </Flex_tlog>
+    </ItemGroup>
+    <Message
+      Importance="High"
+      Text="%(Flex.ExecutionDescription)" />
+    <WriteLinesToFile
+      Condition="'@(Flex_tlog)' != '' and '%(Flex_tlog.ExcludedFromBuild)' != 'true'"
+      File="$(IntDir)$(ProjectName).write.1.tlog"
+      Lines="^%(Flex_tlog.Source);@(Flex_tlog-&gt;'%(Fullpath)')" />
+    <Flex
+      Condition="'@(Flex)' != '' and '%(Flex.ExcludedFromBuild)' != 'true'"
+      CommandLineTemplate="%(Flex.CommandLineTemplate)"
+      OutputFile="%(Flex.OutputFile)"
+      HeaderFile="%(Flex.HeaderFile)"
+      Prefix="%(Flex.Prefix)"
+      Wincompat="%(Flex.Wincompat)"
+      CaseInsensitive="%(Flex.CaseInsensitive)"
+      LexCompat="%(Flex.LexCompat)"
+      Stack="%(Flex.Stack)"
+      BisonBridge="%(Flex.BisonBridge)"
+      Noline="%(Flex.Noline)"
+      Reentrant="%(Flex.Reentrant)"
+      Cpp="%(Flex.Cpp)"
+      CppClassName="%(Flex.CppClassName)"
+      Debug="%(Flex.Debug)"
+      AdditionalOptions="%(Flex.AdditionalOptions)"
+      Inputs="%(Flex.Identity)" />
+  </Target>
+  <PropertyGroup>
+    <ComputeLinkInputsTargets>
+            $(ComputeLinkInputsTargets);
+            ComputeFlexOutput;
+          </ComputeLinkInputsTargets>
+    <ComputeLibInputsTargets>
+            $(ComputeLibInputsTargets);
+            ComputeFlexOutput;
+          </ComputeLibInputsTargets>
+  </PropertyGroup>
+  <Target
+    Name="ComputeFlexOutput"
+    Condition="'@(Flex)' != ''">
+    <ItemGroup>
+      <FlexDirsToMake
+        Condition="'@(Flex)' != '' and '%(Flex.ExcludedFromBuild)' != 'true'"
+        Include="%(Flex.Outputs)" />
+      <Link
+        Include="%(FlexDirsToMake.Identity)"
+        Condition="'%(Extension)'=='.obj' or '%(Extension)'=='.res' or '%(Extension)'=='.rsc' or '%(Extension)'=='.lib'" />
+      <Lib
+        Include="%(FlexDirsToMake.Identity)"
+        Condition="'%(Extension)'=='.obj' or '%(Extension)'=='.res' or '%(Extension)'=='.rsc' or '%(Extension)'=='.lib'" />
+      <ImpLib
+        Include="%(FlexDirsToMake.Identity)"
+        Condition="'%(Extension)'=='.obj' or '%(Extension)'=='.res' or '%(Extension)'=='.rsc' or '%(Extension)'=='.lib'" />
+    </ItemGroup>
+    <MakeDir
+      Directories="@(FlexDirsToMake-&gt;'%(RootDir)%(Directory)')" />
+  </Target>
+</Project>

Engine/bin/bison-flex/custom_build_rules/win_flex_bison/win_flex_bison_custom_build.xml

@@ -0,0 +1,521 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ProjectSchemaDefinitions xmlns="clr-namespace:Microsoft.Build.Framework.XamlTypes;assembly=Microsoft.Build.Framework" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:sys="clr-namespace:System;assembly=mscorlib" xmlns:transformCallback="Microsoft.Cpp.Dev10.ConvertPropertyCallback">
+  <Rule
+    Name="Bison"
+    PageTemplate="tool"
+    DisplayName="Bison files"
+    SwitchPrefix="--"
+    Order="200">
+    <Rule.DataSource>
+      <DataSource
+        Persistence="ProjectFile"
+        ItemType="Bison" />
+    </Rule.DataSource>
+    <Rule.Categories>
+      <Category
+        Name="General">
+        <Category.DisplayName>
+          <sys:String>General</sys:String>
+        </Category.DisplayName>
+      </Category>
+      <Category
+        Name="Bison Options">
+        <Category.DisplayName>
+          <sys:String>Bison Options</sys:String>
+        </Category.DisplayName>
+      </Category>
+      <Category
+        Name="Command Line"
+        Subtype="CommandLine">
+        <Category.DisplayName>
+          <sys:String>Command Line</sys:String>
+        </Category.DisplayName>
+      </Category>
+    </Rule.Categories>
+
+    <StringListProperty
+      Name="OutputFile"
+      Category="Bison Options"
+      IsRequired="true"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Bison-Options.html#Bison-Options"
+      DisplayName="Output File Name"
+      Description="Specify the file for the parser implementation file. --output=value"
+      Switch="output=&quot;[value]&quot;"
+      />
+
+    <StringListProperty
+      Name="DefinesFile"
+      Category="Bison Options"
+      Subtype="file"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Bison-Options.html#Bison-Options"
+      DisplayName="Defines File Name"
+      Description="Pretend that %defines was specified, i.e., write an extra output file containing macro definitions for the token type names defined in the grammar, as well as a few other declarations. --defines=value"
+      Switch="defines=&quot;[value]&quot;"
+      />
+    
+    <BoolProperty
+      Name="Debug"
+      Category="Bison Options"
+      DisplayName="Debug"
+      Description="In the parser implementation file, define the macro YYDEBUG to 1 if it is not already defined, so that the debugging facilities are compiled. (--debug)"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Enabling-Traces.html#Enabling-Traces"
+      Switch="debug" />
+    
+    <BoolProperty
+      Name="Verbose"
+      Category="Bison Options"
+      DisplayName="Verbose"
+      Description="Write an extra output file containing verbose descriptions of the parser states and what is done for each type of lookahead token in that state. (--verbose)"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Understanding.html#Understanding"
+      Switch="verbose" />
+
+    <BoolProperty
+      Name="NoLines"
+      Category="Bison Options"
+      DisplayName="No lines"
+      Description="Don’t put any #line preprocessor commands in the parser implementation file. (--no-lines)"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Bison-Options.html#Bison-Options"
+      Switch="no-lines" />
+
+    <StringListProperty
+      Name="FilePrefix"
+      Category="Bison Options"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Bison-Options.html#Bison-Options"
+      DisplayName="File Prefix"
+      Description="Pretend that %file-prefix was specified, i.e., specify prefix to use for all Bison output file names. --file-prefix=prefix"
+      Switch="file-prefix=&quot;[value]&quot;"
+      />
+
+    <StringListProperty
+      Name="GraphFile"
+      Category="Bison Options"
+      Subtype="file"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Bison-Options.html#Bison-Options"
+      DisplayName="Graph File"
+      Description="Output a graphical representation of the parser’s automaton computed by Bison, in Graphviz DOT format. --graph=file"
+      Switch="graph=&quot;[value]&quot;"
+      />
+
+    <EnumProperty
+      Name="Warnings"
+      Category="Bison Options"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Bison-Options.html#Bison-Options"
+      DisplayName="Warnings"
+      Description="Output warnings falling in category. (--warnings=category)">
+
+      <EnumValue
+        Name="midrule-values"
+        DisplayName="midrule-values"
+        Switch="warnings=midrule-values"/>
+      <EnumValue
+        Name="yacc"
+        DisplayName="yacc"
+        Switch="warnings=yacc"/>
+      <EnumValue
+        Name="conflicts-sr"
+        DisplayName="conflicts-sr"
+        Switch="warnings=conflicts-sr"/>
+      <EnumValue
+        Name="conflicts-rr"
+        DisplayName="conflicts-rr"
+        Switch="warnings=conflicts-rr"/>
+      <EnumValue
+        Name="other"
+        DisplayName="other"
+        Switch="warnings=other"/>
+      <EnumValue
+        Name="all"
+        DisplayName="all"
+        Switch="warnings=all"/>
+      <EnumValue
+        Name="none"
+        DisplayName="none"
+        Switch="warnings=none"/>
+      <EnumValue
+        Name="error"
+        DisplayName="error"
+        Switch="warnings=error"/>
+    </EnumProperty>
+
+    <EnumProperty
+      Name="Report"
+      Category="Bison Options"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Bison-Options.html#Bison-Options"
+      DisplayName="Report"
+      Description="Write an extra output file containing verbose description of the comma separated list of things. (--report=things)">
+      
+      <EnumValue
+        Name="state"
+        DisplayName="state"
+        Switch="report=state"/>
+      <EnumValue
+        Name="itemset"
+        DisplayName="itemset"
+        Switch="report=itemset"/>
+      <EnumValue
+        Name="lookahead"
+        DisplayName="lookahead"
+        Switch="report=lookahead"/>
+      <EnumValue
+        Name="solved"
+        DisplayName="solved"
+        Switch="report=solved"/>
+      <EnumValue
+        Name="all"
+        DisplayName="all"
+        Switch="report=all"/>
+      <EnumValue
+        Name="none"
+        DisplayName="none"
+        Switch="report=none"/>
+    </EnumProperty>
+
+    <StringListProperty
+      Name="ReportFile"
+      Category="Bison Options"
+      HelpUrl="https://www.gnu.org/software/bison/manual/html_node/Bison-Options.html#Bison-Options"
+      DisplayName="Report File Name"
+      Description="Specify the file for the verbose description. --report-file=value"
+      Switch="report-file=&quot;[value]&quot;"
+      />
+
+    <StringListProperty
+      Name="Inputs"
+      Category="Command Line"
+      IsRequired="true"
+      Switch=" ">
+      <StringListProperty.DataSource>
+        <DataSource
+          Persistence="ProjectFile"
+          ItemType="Bison"
+          SourceType="Item" />
+      </StringListProperty.DataSource>
+    </StringListProperty>
+    <StringProperty
+      Name="CommandLineTemplate"
+      DisplayName="Command Line"
+      Visible="False"
+      IncludeInCommandLine="False" />
+    <DynamicEnumProperty
+      Name="BisonBeforeTargets"
+      Category="General"
+      EnumProvider="Targets"
+      IncludeInCommandLine="False">
+      <DynamicEnumProperty.DisplayName>
+        <sys:String>Execute Before</sys:String>
+      </DynamicEnumProperty.DisplayName>
+      <DynamicEnumProperty.Description>
+        <sys:String>Specifies the targets for the build customization to run before.</sys:String>
+      </DynamicEnumProperty.Description>
+      <DynamicEnumProperty.ProviderSettings>
+        <NameValuePair
+          Name="Exclude"
+          Value="^BisonBeforeTargets|^Compute" />
+      </DynamicEnumProperty.ProviderSettings>
+      <DynamicEnumProperty.DataSource>
+        <DataSource
+          Persistence="ProjectFile"
+          HasConfigurationCondition="true" />
+      </DynamicEnumProperty.DataSource>
+    </DynamicEnumProperty>
+    <DynamicEnumProperty
+      Name="BisonAfterTargets"
+      Category="General"
+      EnumProvider="Targets"
+      IncludeInCommandLine="False">
+      <DynamicEnumProperty.DisplayName>
+        <sys:String>Execute After</sys:String>
+      </DynamicEnumProperty.DisplayName>
+      <DynamicEnumProperty.Description>
+        <sys:String>Specifies the targets for the build customization to run after.</sys:String>
+      </DynamicEnumProperty.Description>
+      <DynamicEnumProperty.ProviderSettings>
+        <NameValuePair
+          Name="Exclude"
+          Value="^BisonAfterTargets|^Compute" />
+      </DynamicEnumProperty.ProviderSettings>
+      <DynamicEnumProperty.DataSource>
+        <DataSource
+          Persistence="ProjectFile"
+          ItemType=""
+          HasConfigurationCondition="true" />
+      </DynamicEnumProperty.DataSource>
+    </DynamicEnumProperty>
+    <StringListProperty
+      Name="Outputs"
+      DisplayName="Outputs"
+      Visible="False"
+      IncludeInCommandLine="False" />
+    <StringProperty
+      Name="ExecutionDescription"
+      DisplayName="Execution Description"
+      Visible="False"
+      IncludeInCommandLine="False" />
+    <StringListProperty
+      Name="AdditionalDependencies"
+      DisplayName="Additional Dependencies"
+      IncludeInCommandLine="False"
+      Visible="false" />
+    <StringProperty
+      Subtype="AdditionalOptions"
+      Name="AdditionalOptions"
+      Category="Command Line">
+      <StringProperty.DisplayName>
+        <sys:String>Additional Options</sys:String>
+      </StringProperty.DisplayName>
+      <StringProperty.Description>
+        <sys:String>Additional Options</sys:String>
+      </StringProperty.Description>
+    </StringProperty>
+  </Rule>
+  <ItemType
+    Name="Bison"
+    DisplayName="Bison files" />
+  <FileExtension
+    Name="*.y"
+    ContentType="Bison" />
+  <ContentType
+    Name="Bison"
+    DisplayName="Bison files"
+    ItemType="Bison" />
+  <Rule
+    Name="Flex"
+    PageTemplate="tool"
+    DisplayName="Flex files"
+    SwitchPrefix="--"
+    Order="200">
+    <Rule.DataSource>
+      <DataSource
+        Persistence="ProjectFile"
+        ItemType="Flex" />
+    </Rule.DataSource>
+    <Rule.Categories>
+      <Category
+        Name="General">
+        <Category.DisplayName>
+          <sys:String>General</sys:String>
+        </Category.DisplayName>
+      </Category>
+      <Category
+        Name="Flex Options">
+        <Category.DisplayName>
+          <sys:String>Flex Options</sys:String>
+        </Category.DisplayName>
+      </Category>
+      <Category
+        Name="Command Line"
+        Subtype="CommandLine">
+        <Category.DisplayName>
+          <sys:String>Command Line</sys:String>
+        </Category.DisplayName>
+      </Category>
+    </Rule.Categories>
+
+    <StringListProperty
+      Name="OutputFile"
+      Category="Flex Options"
+      IsRequired="true"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      DisplayName="Output File Name"
+      Description="Directs flex to write the scanner to the file ‘FILE’ instead of ‘lex.yy.c’. --outfile=value"
+      Switch="outfile=&quot;[value]&quot;"
+      />
+
+    <StringListProperty
+      Name="HeaderFile"
+      Category="Flex Options"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      DisplayName="Header File Name"
+      Description="Instructs flex to write a C header to ‘FILE’. This file contains function prototypes, extern variables, and types used by the scanner. Only the external API is exported by the header file.         (--header-file=value)"
+      Switch="header-file=&quot;[value]&quot;"
+      />
+
+    <StringListProperty
+      Name="Prefix"
+      Category="Flex Options"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      DisplayName="Prefix"
+      Description="Changes the default ‘yy’ prefix used by flex for all globally-visible variable and function names to instead be ‘PREFIX’. For example, ‘--prefix=foo’ changes the name of yytext to footext. It also changes the name of the default output file from lex.yy.c to lex.foo.c.         (--prefix=value)"
+      Switch="prefix=&quot;[value]&quot;"
+      />
+
+	  <BoolProperty
+      Name="Wincompat"
+      Category="Flex Options"
+      DisplayName="Windows compatibility mode"
+      Description="This option changes 'unistd.h' unix header with windows analog 'io.h' and replaces isatty/fileno functions to safe windows analogs _isatty/_fileno.            (--wincompat)"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      Switch="wincompat" />
+
+  <BoolProperty
+      Name="CaseInsensitive"
+      Category="Flex Options"
+      DisplayName="Case-insensitive mode"
+      Description="Instructs flex to generate a case-insensitive scanner. The case of letters given in the flex input patterns will be ignored, and tokens in the input will be matched regardless of case. The matched text given in yytext will have the preserved case (i.e., it will not be folded).            (--case-insensitive)"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      Switch="case-insensitive" />
+
+    <BoolProperty
+      Name="LexCompat"
+      Category="Flex Options"
+      DisplayName="Lex-compatibility mode"
+      Description="Turns on maximum compatibility with the original AT&amp;T lex implementation. Note that this does not mean full compatibility. Use of this option costs a considerable amount of performance, and it cannot be used with the ‘--c++’, ‘--full’, ‘--fast’, ‘-Cf’, or ‘-CF’ options.            (--lex-compat)"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      Switch="lex-compat" />
+
+    <BoolProperty
+      Name="Stack"
+      Category="Flex Options"
+      DisplayName="Start Condition Stacks"
+      Description="Enables the use of start condition stacks.            (--stack)"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      Switch="stack" />
+
+    <BoolProperty
+      Name="BisonBridge"
+      Category="Flex Options"
+      DisplayName="Bison Bridge Mode"
+      Description="Instructs flex to generate a C scanner that is meant to be called by a GNU bison parser. The scanner has minor API changes for bison compatibility. In particular, the declaration of yylex is modified to take an additional parameter, yylval.            (--bison-bridge)"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      Switch="bison-bridge" />
+
+    <BoolProperty
+      Name="Noline"
+      Category="Flex Options"
+      DisplayName="No #line Directives"
+      Description="Instructs flex not to generate #line directives.            (--noline)"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      Switch="noline" />
+
+    <BoolProperty
+       Name="Reentrant"
+       Category="Flex Options"
+       DisplayName="Generate Reentrant Scanner"
+       Description="Instructs flex to generate a reentrant C scanner. The generated scanner may safely be used in a multi-threaded environment. The API for a reentrant scanner is different than for a non-reentrant scanner.            (--reentrant)"
+       HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+       Switch="reentrant" />
+
+    <BoolProperty
+       Name="Cpp"
+       Category="Flex Options"
+       DisplayName="Generate C++ Scanner"
+       Description="Specifies that you want flex to generate a C++ scanner class.           (--c++)"
+       HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+       Switch="c++" />
+
+    <StringListProperty
+      Name="CppClassName"
+      Category="Flex Options"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      DisplayName="C++ Class Name"
+      Description="Only applies when generating a C++ scanner (the ‘--c++’ option). It informs flex that you have derived NAME as a subclass of yyFlexLexer, so flex will place your actions in the member function foo::yylex() instead of yyFlexLexer::yylex(). It also generates a yyFlexLexer::yylex() member function that emits a run-time error (by invoking yyFlexLexer::LexerError()) if called.         (--yyclass=value)"
+      Switch="yyclass=&quot;[value]&quot;" />
+
+	   <BoolProperty
+       Name="Debug"
+       Category="Flex Options"
+       DisplayName="Debug Mode"
+       Description="Makes the generated scanner run in debug mode. Whenever a pattern is recognized and the global variable yy_flex_debug is non-zero (which is the default), the scanner will write to ‘stderr’ a line of the form: -accepting rule at line 53 ('the matched text').           (--debug)"
+       HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+       Switch="debug" />
+
+    <StringListProperty
+      Name="Inputs"
+      Category="Command Line"
+      IsRequired="true"
+      Switch=" ">
+      <StringListProperty.DataSource>
+        <DataSource
+          Persistence="ProjectFile"
+          ItemType="Flex"
+          SourceType="Item" />
+      </StringListProperty.DataSource>
+    </StringListProperty>
+    <StringProperty
+      Name="CommandLineTemplate"
+      DisplayName="Command Line"
+      Visible="False"
+      IncludeInCommandLine="False" />
+    <DynamicEnumProperty
+      Name="FlexBeforeTargets"
+      Category="General"
+      EnumProvider="Targets"
+      IncludeInCommandLine="False">
+      <DynamicEnumProperty.DisplayName>
+        <sys:String>Execute Before</sys:String>
+      </DynamicEnumProperty.DisplayName>
+      <DynamicEnumProperty.Description>
+        <sys:String>Specifies the targets for the build customization to run before.</sys:String>
+      </DynamicEnumProperty.Description>
+      <DynamicEnumProperty.ProviderSettings>
+        <NameValuePair
+          Name="Exclude"
+          Value="^FlexBeforeTargets|^Compute" />
+      </DynamicEnumProperty.ProviderSettings>
+      <DynamicEnumProperty.DataSource>
+        <DataSource
+          Persistence="ProjectFile"
+          HasConfigurationCondition="true" />
+      </DynamicEnumProperty.DataSource>
+    </DynamicEnumProperty>
+    <DynamicEnumProperty
+      Name="FlexAfterTargets"
+      Category="General"
+      EnumProvider="Targets"
+      IncludeInCommandLine="False">
+      <DynamicEnumProperty.DisplayName>
+        <sys:String>Execute After</sys:String>
+      </DynamicEnumProperty.DisplayName>
+      <DynamicEnumProperty.Description>
+        <sys:String>Specifies the targets for the build customization to run after.</sys:String>
+      </DynamicEnumProperty.Description>
+      <DynamicEnumProperty.ProviderSettings>
+        <NameValuePair
+          Name="Exclude"
+          Value="^FlexAfterTargets|^Compute" />
+      </DynamicEnumProperty.ProviderSettings>
+      <DynamicEnumProperty.DataSource>
+        <DataSource
+          Persistence="ProjectFile"
+          ItemType=""
+          HasConfigurationCondition="true" />
+      </DynamicEnumProperty.DataSource>
+    </DynamicEnumProperty>
+    <StringListProperty
+      Name="Outputs"
+      DisplayName="Outputs"
+      Visible="False"
+      IncludeInCommandLine="False" />
+    <StringProperty
+      Name="ExecutionDescription"
+      DisplayName="Execution Description"
+      Visible="False"
+      IncludeInCommandLine="False" />
+    <StringListProperty
+      Name="AdditionalDependencies"
+      DisplayName="Additional Dependencies"
+      IncludeInCommandLine="False"
+      Visible="false" />
+    <StringProperty
+      Subtype="AdditionalOptions"
+      Name="AdditionalOptions"
+      Category="Command Line">
+      <StringProperty.DisplayName>
+        <sys:String>Additional Options</sys:String>
+      </StringProperty.DisplayName>
+      <StringProperty.Description>
+        <sys:String>Additional Options</sys:String>
+      </StringProperty.Description>
+    </StringProperty>
+  </Rule>
+  <ItemType
+    Name="Flex"
+    DisplayName="Flex files" />
+  <FileExtension
+    Name="*.l"
+    ContentType="Flex" />
+  <ContentType
+    Name="Flex"
+    DisplayName="Flex files"
+    ItemType="Flex" />
+  </ProjectSchemaDefinitions>

Engine/bin/bison-flex/custom_build_rules/win_flex_only/win_flex_custom_build.props

@@ -0,0 +1,23 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup
+    Condition="'$(FlexBeforeTargets)' == '' and '$(FlexAfterTargets)' == '' and '$(ConfigurationType)' != 'Makefile'">
+    <FlexBeforeTargets>Midl</FlexBeforeTargets>
+    <FlexAfterTargets>CustomBuild</FlexAfterTargets>
+  </PropertyGroup>
+  <PropertyGroup>
+    <FlexDependsOn
+      Condition="'$(ConfigurationType)' != 'Makefile'">_SelectedFiles;$(FlexDependsOn)</FlexDependsOn>
+  </PropertyGroup>
+  <ItemDefinitionGroup>
+    <Flex>
+      <OutputFile>%(Filename).flex.cpp</OutputFile>
+      <Wincompat>true</Wincompat>
+      <CommandLineTemplate>
+start /B /WAIT /D "%(RootDir)%(Directory)" win_flex.exe [AllOptions] [AdditionalOptions] "%(Filename)%(Extension)"
+exit /b %errorlevel%</CommandLineTemplate>
+      <Outputs>%(RootDir)%(Directory)%(OutputFile);</Outputs>
+      <ExecutionDescription>Process "%(Filename)%(Extension)" flex file</ExecutionDescription>
+    </Flex>
+  </ItemDefinitionGroup>
+</Project>

Engine/bin/bison-flex/custom_build_rules/win_flex_only/win_flex_custom_build.targets

@@ -0,0 +1,94 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <PropertyPageSchema
+      Include="$(MSBuildThisFileDirectory)$(MSBuildThisFileName).xml" />
+    <AvailableItemName
+      Include="Flex">
+      <Targets>FlexTarget</Targets>
+    </AvailableItemName>
+  </ItemGroup>
+  <UsingTask
+    TaskName="Flex"
+    TaskFactory="XamlTaskFactory"
+    AssemblyName="Microsoft.Build.Tasks.v4.0">
+    <Task>$(MSBuildThisFileDirectory)$(MSBuildThisFileName).xml</Task>
+  </UsingTask>
+  <Target
+    Name="FlexTarget"
+    BeforeTargets="$(FlexBeforeTargets)"
+    AfterTargets="$(FlexAfterTargets)"
+    Condition="'@(Flex)' != ''"
+    DependsOnTargets="$(FlexDependsOn);ComputeFlexOutput"
+    Outputs="%(Flex.Outputs)"
+    Inputs="%(Flex.Identity);%(Flex.AdditionalDependencies);$(MSBuildProjectFile)">
+    <ItemGroup
+      Condition="'@(SelectedFiles)' != ''">
+      <Flex
+        Remove="@(Flex)"
+        Condition="'%(Identity)' != '@(SelectedFiles)'" />
+    </ItemGroup>
+    <ItemGroup>
+      <Flex_tlog
+        Include="%(Flex.Outputs)"
+        Condition="'%(Flex.Outputs)' != '' and '%(Flex.ExcludedFromBuild)' != 'true'">
+        <Source>@(Flex, '|')</Source>
+      </Flex_tlog>
+    </ItemGroup>
+    <Message
+      Importance="High"
+      Text="%(Flex.ExecutionDescription)" />
+    <WriteLinesToFile
+      Condition="'@(Flex_tlog)' != '' and '%(Flex_tlog.ExcludedFromBuild)' != 'true'"
+      File="$(IntDir)$(ProjectName).write.1.tlog"
+      Lines="^%(Flex_tlog.Source);@(Flex_tlog-&gt;'%(Fullpath)')" />
+    <Flex
+      Condition="'@(Flex)' != '' and '%(Flex.ExcludedFromBuild)' != 'true'"
+      CommandLineTemplate="%(Flex.CommandLineTemplate)"
+      OutputFile="%(Flex.OutputFile)"
+      HeaderFile="%(Flex.HeaderFile)"
+      Prefix="%(Flex.Prefix)"
+      Wincompat="%(Flex.Wincompat)"
+      CaseInsensitive="%(Flex.CaseInsensitive)"
+      LexCompat="%(Flex.LexCompat)"
+      Stack="%(Flex.Stack)"
+      BisonBridge="%(Flex.BisonBridge)"
+      Noline="%(Flex.Noline)"
+      Reentrant="%(Flex.Reentrant)"
+      Cpp="%(Flex.Cpp)"
+      CppClassName="%(Flex.CppClassName)"
+      Debug="%(Flex.Debug)"
+      AdditionalOptions="%(Flex.AdditionalOptions)"
+      Inputs="%(Flex.Identity)" />
+  </Target>
+  <PropertyGroup>
+    <ComputeLinkInputsTargets>
+            $(ComputeLinkInputsTargets);
+            ComputeFlexOutput;
+          </ComputeLinkInputsTargets>
+    <ComputeLibInputsTargets>
+            $(ComputeLibInputsTargets);
+            ComputeFlexOutput;
+          </ComputeLibInputsTargets>
+  </PropertyGroup>
+  <Target
+    Name="ComputeFlexOutput"
+    Condition="'@(Flex)' != ''">
+    <ItemGroup>
+      <FlexDirsToMake
+        Condition="'@(Flex)' != '' and '%(Flex.ExcludedFromBuild)' != 'true'"
+        Include="%(Flex.Outputs)" />
+      <Link
+        Include="%(FlexDirsToMake.Identity)"
+        Condition="'%(Extension)'=='.obj' or '%(Extension)'=='.res' or '%(Extension)'=='.rsc' or '%(Extension)'=='.lib'" />
+      <Lib
+        Include="%(FlexDirsToMake.Identity)"
+        Condition="'%(Extension)'=='.obj' or '%(Extension)'=='.res' or '%(Extension)'=='.rsc' or '%(Extension)'=='.lib'" />
+      <ImpLib
+        Include="%(FlexDirsToMake.Identity)"
+        Condition="'%(Extension)'=='.obj' or '%(Extension)'=='.res' or '%(Extension)'=='.rsc' or '%(Extension)'=='.lib'" />
+    </ItemGroup>
+    <MakeDir
+      Directories="@(FlexDirsToMake-&gt;'%(RootDir)%(Directory)')" />
+  </Target>
+</Project>

Engine/bin/bison-flex/custom_build_rules/win_flex_only/win_flex_custom_build.xml

@@ -0,0 +1,243 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ProjectSchemaDefinitions xmlns="clr-namespace:Microsoft.Build.Framework.XamlTypes;assembly=Microsoft.Build.Framework" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:sys="clr-namespace:System;assembly=mscorlib" xmlns:transformCallback="Microsoft.Cpp.Dev10.ConvertPropertyCallback">
+  <Rule
+    Name="Flex"
+    PageTemplate="tool"
+    DisplayName="Flex files"
+    SwitchPrefix="--"
+    Order="200">
+    <Rule.DataSource>
+      <DataSource
+        Persistence="ProjectFile"
+        ItemType="Flex" />
+    </Rule.DataSource>
+    <Rule.Categories>
+      <Category
+        Name="General">
+        <Category.DisplayName>
+          <sys:String>General</sys:String>
+        </Category.DisplayName>
+      </Category>
+      <Category
+        Name="Flex Options">
+        <Category.DisplayName>
+          <sys:String>Flex Options</sys:String>
+        </Category.DisplayName>
+      </Category>
+      <Category
+        Name="Command Line"
+        Subtype="CommandLine">
+        <Category.DisplayName>
+          <sys:String>Command Line</sys:String>
+        </Category.DisplayName>
+      </Category>
+    </Rule.Categories>
+
+    <StringListProperty
+      Name="OutputFile"
+      Category="Flex Options"
+      IsRequired="true"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      DisplayName="Output File Name"
+      Description="Directs flex to write the scanner to the file ‘FILE’ instead of ‘lex.yy.c’. --outfile=value"
+      Switch="outfile=&quot;[value]&quot;"
+      />
+
+    <StringListProperty
+      Name="HeaderFile"
+      Category="Flex Options"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      DisplayName="Header File Name"
+      Description="Instructs flex to write a C header to ‘FILE’. This file contains function prototypes, extern variables, and types used by the scanner. Only the external API is exported by the header file.         (--header-file=value)"
+      Switch="header-file=&quot;[value]&quot;"
+      />
+
+    <StringListProperty
+      Name="Prefix"
+      Category="Flex Options"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      DisplayName="Prefix"
+      Description="Changes the default ‘yy’ prefix used by flex for all globally-visible variable and function names to instead be ‘PREFIX’. For example, ‘--prefix=foo’ changes the name of yytext to footext. It also changes the name of the default output file from lex.yy.c to lex.foo.c.         (--prefix=value)"
+      Switch="prefix=&quot;[value]&quot;"
+      />
+
+	  <BoolProperty
+      Name="Wincompat"
+      Category="Flex Options"
+      DisplayName="Windows compatibility mode"
+      Description="This option changes 'unistd.h' unix header with windows analog 'io.h' and replaces isatty/fileno functions to safe windows analogs _isatty/_fileno.            (--wincompat)"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      Switch="wincompat" />
+
+  <BoolProperty
+      Name="CaseInsensitive"
+      Category="Flex Options"
+      DisplayName="Case-insensitive mode"
+      Description="Instructs flex to generate a case-insensitive scanner. The case of letters given in the flex input patterns will be ignored, and tokens in the input will be matched regardless of case. The matched text given in yytext will have the preserved case (i.e., it will not be folded).            (--case-insensitive)"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      Switch="case-insensitive" />
+
+    <BoolProperty
+      Name="LexCompat"
+      Category="Flex Options"
+      DisplayName="Lex-compatibility mode"
+      Description="Turns on maximum compatibility with the original AT&amp;T lex implementation. Note that this does not mean full compatibility. Use of this option costs a considerable amount of performance, and it cannot be used with the ‘--c++’, ‘--full’, ‘--fast’, ‘-Cf’, or ‘-CF’ options.            (--lex-compat)"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      Switch="lex-compat" />
+
+    <BoolProperty
+      Name="Stack"
+      Category="Flex Options"
+      DisplayName="Start Condition Stacks"
+      Description="Enables the use of start condition stacks.            (--stack)"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      Switch="stack" />
+
+    <BoolProperty
+      Name="BisonBridge"
+      Category="Flex Options"
+      DisplayName="Bison Bridge Mode"
+      Description="Instructs flex to generate a C scanner that is meant to be called by a GNU bison parser. The scanner has minor API changes for bison compatibility. In particular, the declaration of yylex is modified to take an additional parameter, yylval.            (--bison-bridge)"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      Switch="bison-bridge" />
+
+    <BoolProperty
+      Name="Noline"
+      Category="Flex Options"
+      DisplayName="No #line Directives"
+      Description="Instructs flex not to generate #line directives.            (--noline)"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      Switch="noline" />
+
+    <BoolProperty
+       Name="Reentrant"
+       Category="Flex Options"
+       DisplayName="Generate Reentrant Scanner"
+       Description="Instructs flex to generate a reentrant C scanner. The generated scanner may safely be used in a multi-threaded environment. The API for a reentrant scanner is different than for a non-reentrant scanner.            (--reentrant)"
+       HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+       Switch="reentrant" />
+
+    <BoolProperty
+       Name="Cpp"
+       Category="Flex Options"
+       DisplayName="Generate C++ Scanner"
+       Description="Specifies that you want flex to generate a C++ scanner class.           (--c++)"
+       HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+       Switch="c++" />
+
+    <StringListProperty
+      Name="CppClassName"
+      Category="Flex Options"
+      HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+      DisplayName="C++ Class Name"
+      Description="Only applies when generating a C++ scanner (the ‘--c++’ option). It informs flex that you have derived NAME as a subclass of yyFlexLexer, so flex will place your actions in the member function foo::yylex() instead of yyFlexLexer::yylex(). It also generates a yyFlexLexer::yylex() member function that emits a run-time error (by invoking yyFlexLexer::LexerError()) if called.         (--yyclass=value)"
+      Switch="yyclass=&quot;[value]&quot;" />
+
+	   <BoolProperty
+       Name="Debug"
+       Category="Flex Options"
+       DisplayName="Debug Mode"
+       Description="Makes the generated scanner run in debug mode. Whenever a pattern is recognized and the global variable yy_flex_debug is non-zero (which is the default), the scanner will write to ‘stderr’ a line of the form: -accepting rule at line 53 ('the matched text').           (--debug)"
+       HelpUrl="https://westes.github.io/flex/manual/Scanner-Options.html#Scanner-Options"
+       Switch="debug" />
+
+    <StringListProperty
+      Name="Inputs"
+      Category="Command Line"
+      IsRequired="true"
+      Switch=" ">
+      <StringListProperty.DataSource>
+        <DataSource
+          Persistence="ProjectFile"
+          ItemType="Flex"
+          SourceType="Item" />
+      </StringListProperty.DataSource>
+    </StringListProperty>
+    <StringProperty
+      Name="CommandLineTemplate"
+      DisplayName="Command Line"
+      Visible="False"
+      IncludeInCommandLine="False" />
+    <DynamicEnumProperty
+      Name="FlexBeforeTargets"
+      Category="General"
+      EnumProvider="Targets"
+      IncludeInCommandLine="False">
+      <DynamicEnumProperty.DisplayName>
+        <sys:String>Execute Before</sys:String>
+      </DynamicEnumProperty.DisplayName>
+      <DynamicEnumProperty.Description>
+        <sys:String>Specifies the targets for the build customization to run before.</sys:String>
+      </DynamicEnumProperty.Description>
+      <DynamicEnumProperty.ProviderSettings>
+        <NameValuePair
+          Name="Exclude"
+          Value="^FlexBeforeTargets|^Compute" />
+      </DynamicEnumProperty.ProviderSettings>
+      <DynamicEnumProperty.DataSource>
+        <DataSource
+          Persistence="ProjectFile"
+          HasConfigurationCondition="true" />
+      </DynamicEnumProperty.DataSource>
+    </DynamicEnumProperty>
+    <DynamicEnumProperty
+      Name="FlexAfterTargets"
+      Category="General"
+      EnumProvider="Targets"
+      IncludeInCommandLine="False">
+      <DynamicEnumProperty.DisplayName>
+        <sys:String>Execute After</sys:String>
+      </DynamicEnumProperty.DisplayName>
+      <DynamicEnumProperty.Description>
+        <sys:String>Specifies the targets for the build customization to run after.</sys:String>
+      </DynamicEnumProperty.Description>
+      <DynamicEnumProperty.ProviderSettings>
+        <NameValuePair
+          Name="Exclude"
+          Value="^FlexAfterTargets|^Compute" />
+      </DynamicEnumProperty.ProviderSettings>
+      <DynamicEnumProperty.DataSource>
+        <DataSource
+          Persistence="ProjectFile"
+          ItemType=""
+          HasConfigurationCondition="true" />
+      </DynamicEnumProperty.DataSource>
+    </DynamicEnumProperty>
+    <StringListProperty
+      Name="Outputs"
+      DisplayName="Outputs"
+      Visible="False"
+      IncludeInCommandLine="False" />
+    <StringProperty
+      Name="ExecutionDescription"
+      DisplayName="Execution Description"
+      Visible="False"
+      IncludeInCommandLine="False" />
+    <StringListProperty
+      Name="AdditionalDependencies"
+      DisplayName="Additional Dependencies"
+      IncludeInCommandLine="False"
+      Visible="false" />
+    <StringProperty
+      Subtype="AdditionalOptions"
+      Name="AdditionalOptions"
+      Category="Command Line">
+      <StringProperty.DisplayName>
+        <sys:String>Additional Options</sys:String>
+      </StringProperty.DisplayName>
+      <StringProperty.Description>
+        <sys:String>Additional Options</sys:String>
+      </StringProperty.Description>
+    </StringProperty>
+  </Rule>
+  <ItemType
+    Name="Flex"
+    DisplayName="Flex files" />
+  <FileExtension
+    Name="*.l"
+    ContentType="Flex" />
+  <ContentType
+    Name="Flex"
+    DisplayName="Flex files"
+    ItemType="Flex" />
+  </ProjectSchemaDefinitions>

Engine/bin/bison-flex/data/README.md

@@ -0,0 +1,227 @@
+This directory contains data needed by Bison.
+
+# Directory Content
+## Skeletons
+Bison skeletons: the general shapes of the different parser kinds, that are
+specialized for specific grammars by the bison program.
+
+Currently, the supported skeletons are:
+
+- yacc.c
+  It used to be named bison.simple: it corresponds to C Yacc
+  compatible LALR(1) parsers.
+
+- lalr1.cc
+  Produces a C++ parser class.
+
+- lalr1.java
+  Produces a Java parser class.
+
+- glr.c
+  A Generalized LR C parser based on Bison's LALR(1) tables.
+
+- glr.cc
+  A Generalized LR C++ parser.  Actually a C++ wrapper around glr.c.
+
+These skeletons are the only ones supported by the Bison team.  Because the
+interface between skeletons and the bison program is not finished, *we are
+not bound to it*.  In particular, Bison is not mature enough for us to
+consider that "foreign skeletons" are supported.
+
+## m4sugar
+This directory contains M4sugar, sort of an extended library for M4, which
+is used by Bison to instantiate the skeletons.
+
+## xslt
+This directory contains XSLT programs that transform Bison's XML output into
+various formats.
+
+- bison.xsl
+  A library of routines used by the other XSLT programs.
+
+- xml2dot.xsl
+  Conversion into GraphViz's dot format.
+
+- xml2text.xsl
+  Conversion into text.
+
+- xml2xhtml.xsl
+  Conversion into XHTML.
+
+# Implementation Notes About the Skeletons
+
+"Skeleton" in Bison parlance means "backend": a skeleton is fed by the bison
+executable with LR tables, facts about the symbols, etc. and they generate
+the output (say parser.cc, parser.hh, location.hh, etc.).  They are only in
+charge of generating the parser and its auxiliary files, they do not
+generate the XML output, the parser.output reports, nor the graphical
+rendering.
+
+The bits of information passing from bison to the backend is named
+"muscles".  Muscles are passed to M4 via its standard input: it's a set of
+m4 definitions.  To see them, use `--trace=muscles`.
+
+Except for muscles, whose names are generated by bison, the skeletons have
+no constraint at all on the macro names: there is no technical/theoretical
+limitation, as long as you generate the output, you can do what you want.
+However, of course, that would be a bad idea if, say, the C and C++
+skeletons used different approaches and had completely different
+implementations.  That would be a maintenance nightmare.
+
+Below, we document some of the macros that we use in several of the
+skeletons.  If you are to write a new skeleton, please, implement them for
+your language.  Overall, be sure to follow the same patterns as the existing
+skeletons.
+
+## Vocabulary
+
+We use "formal arguments", or "formals" for short, to denote the declared
+parameters of a function (e.g., `int argc, const char **argv`).  Yes, this
+is somewhat contradictory with `param` in the `%param` directives.
+
+We use "effective arguments", or "args" for short, to denote the values
+passed in function calls (e.g., `argc, argv`).
+
+## Symbols
+
+### `b4_symbol(NUM, FIELD)`
+In order to unify the handling of the various aspects of symbols (tag, type
+name, whether terminal, etc.), bison.exe defines one macro per (token,
+field), where field can `has_id`, `id`, etc.: see
+`prepare_symbol_definitions()` in `src/output.c`.
+
+NUM can be:
+- `empty` to denote the "empty" pseudo-symbol when it exists,
+- `eof`, `error`, or `undef`
+- a symbol number.
+
+FIELD can be:
+
+- `has_id`: 0 or 1
+  Whether the symbol has an `id`.
+
+- `id`: string (e.g., `exp`, `NUM`, or `TOK_NUM` with api.token.prefix)
+  If `has_id`, the name of the token kind (prefixed by api.token.prefix if
+  defined), otherwise empty.  Guaranteed to be usable as a C identifier.
+  This is used to define the token kind (i.e., the enum used by the return
+  value of yylex).  Should be named `token_kind`.
+
+- `tag`: string
+  A human readable representation of the symbol.  Can be `'foo'`,
+  `'foo.id'`, `'"foo"'` etc.
+
+- `code`: integer
+  The token code associated to the token kind `id`.
+  The external number as used by yylex.  Can be ASCII code when a character,
+  some number chosen by bison, or some user number in the case of `%token
+  FOO <NUM>`.  Corresponds to `yychar` in `yacc.c`.
+
+- `is_token`: 0 or 1
+  Whether this is a terminal symbol.
+
+- `kind_base`: string (e.g., `YYSYMBOL_exp`, `YYSYMBOL_NUM`)
+  The base of the symbol kind, i.e., the enumerator of this symbol (token or
+  nonterminal) which is mapped to its `number`.
+
+- `kind`: string
+  Same as `kind_base`, but possibly with a prefix in some languages.  E.g.,
+  EOF's `kind_base` and `kind` are `YYSYMBOL_YYEOF` in C, but are
+  `S_YYEMPTY` and `symbol_kind::S_YYEMPTY` in C++.
+
+- `number`: integer
+  The code associated to the `kind`.
+  The internal number (computed from the external number by yytranslate).
+  Corresponds to yytoken in yacc.c.  This is the same number that serves as
+  key in b4_symbol(NUM, FIELD).
+
+  In bison, symbols are first assigned increasing numbers in order of
+  appearance (but tokens first, then nterms).  After grammar reduction,
+  unused nterms are then renumbered to appear last (i.e., first tokens, then
+  used nterms and finally unused nterms).  This final number NUM is the one
+  contained in this field, and it is the one used as key in `b4_symbol(NUM,
+  FIELD)`.
+
+  The code of the rule actions, however, is emitted before we know what
+  symbols are unused, so they use the original numbers.  To avoid confusion,
+  they actually use "orig NUM" instead of just "NUM".  bison also emits
+  definitions for `b4_symbol(orig NUM, number)` that map from original
+  numbers to the new ones.  `b4_symbol` actually resolves `orig NUM` in the
+  other case, i.e., `b4_symbol(orig 42, tag)` would return the tag of the
+  symbols whose original number was 42.
+
+- `has_type`: 0, 1
+  Whether has a semantic value.
+
+- `type_tag`: string
+  When api.value.type=union, the generated name for the union member.
+  yytype_INT etc. for symbols that has_id, otherwise yytype_1 etc.
+
+- `type`: string
+  If it has a semantic value, its type tag, or, if variant are used,
+  its type.
+  In the case of api.value.type=union, type is the real type (e.g. int).
+
+- `slot`: string
+  If it has a semantic value, the name of the union member (i.e., bounces to
+  either `type_tag` or `type`).  It would be better to fix our mess and
+  always use `type` for the true type of the member, and `type_tag` for the
+  name of the union member.
+
+- `has_printer`: 0, 1
+- `printer`: string
+- `printer_file`: string
+- `printer_line`: integer
+- `printer_loc`: location
+  If the symbol has a printer, everything about it.
+
+- `has_destructor`, `destructor`, `destructor_file`, `destructor_line`, `destructor_loc`
+  Likewise.
+
+### `b4_symbol_value(VAL, [SYMBOL-NUM], [TYPE-TAG])`
+Expansion of $$, $1, $<TYPE-TAG>3, etc.
+
+The semantic value from a given VAL.
+- `VAL`: some semantic value storage (typically a union).  e.g., `yylval`
+- `SYMBOL-NUM`: the symbol number from which we extract the type tag.
+- `TYPE-TAG`, the user forced the `<TYPE-TAG>`.
+
+The result can be used safely, it is put in parens to avoid nasty precedence
+issues.
+
+### `b4_lhs_value(SYMBOL-NUM, [TYPE])`
+Expansion of `$$` or `$<TYPE>$`, for symbol `SYMBOL-NUM`.
+
+### `b4_rhs_data(RULE-LENGTH, POS)`
+The data corresponding to the symbol `#POS`, where the current rule has
+`RULE-LENGTH` symbols on RHS.
+
+### `b4_rhs_value(RULE-LENGTH, POS, SYMBOL-NUM, [TYPE])`
+Expansion of `$<TYPE>POS`, where the current rule has `RULE-LENGTH` symbols
+on RHS.
+
+<!--
+
+Local Variables:
+mode: markdown
+fill-column: 76
+ispell-dictionary: "american"
+End:
+
+Copyright (C) 2002, 2008-2015, 2018-2021 Free Software Foundation, Inc.
+
+This file is part of GNU Bison.
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+-->

Engine/bin/bison-flex/data/bison-default.css

@@ -0,0 +1,61 @@
+/* Default styling rules for Bison when doing terminal output.
+   Copyright (C) 2019-2021 Free Software Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* This is an experimental feature.  The class names may change in the
+   future.  */
+
+/* Diagnostics.  */
+.warning   { color: purple; }
+.error     { color: red; }
+.note      { color: cyan; }
+
+.fixit-insert { color: green; }
+
+/* Semantic values in Bison's own parser traces.  */
+.value     { color: green; }
+
+/* "Sections" in traces (--trace).  */
+.trace0    { color: green; }
+
+/* Syntax error messages.  */
+.expected   { color: green; }
+.unexpected { color: red; }
+
+
+/* Counterexamples.  */
+
+/* Cex: point in rule.  */
+.cex-dot { color: red; }
+
+/* Cex: coloring various rules.  */
+.cex-0   { color: yellow; }
+.cex-1   { color: green; }
+.cex-2   { color: blue; }
+.cex-3   { color: purple; }
+.cex-4   { color: violet; }
+.cex-5   { color: orange; }
+.cex-6   { color: brown; }
+.cex-7   { color: mauve; }
+.cex-8   { color: #013220; } /* Dark green. */
+.cex-9   { color: #e75480; } /* Dark pink. */
+.cex-10  { color: cyan; }
+.cex-11  { color: orange; }
+
+/* Cex: derivation rewriting steps.  */
+.cex-step { font-style: italic; }
+
+/* Cex: leaves of a derivation.  */
+.cex-leaf { font-weight: 600; }

Engine/bin/bison-flex/data/local.mk

@@ -0,0 +1,58 @@
+## Copyright (C) 2002, 2005-2015, 2018-2021 Free Software Foundation,
+## Inc.
+
+## This program is free software: you can redistribute it and/or modify
+## it under the terms of the GNU General Public License as published by
+## the Free Software Foundation, either version 3 of the License, or
+## (at your option) any later version.
+##
+## This program is distributed in the hope that it will be useful,
+## but WITHOUT ANY WARRANTY; without even the implied warranty of
+## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+## GNU General Public License for more details.
+##
+## You should have received a copy of the GNU General Public License
+## along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+dist_pkgdata_DATA =                             \
+  data/README.md                                \
+  data/bison-default.css
+
+skeletonsdir = $(pkgdatadir)/skeletons
+dist_skeletons_DATA =                           \
+  data/skeletons/bison.m4                       \
+  data/skeletons/c++-skel.m4                    \
+  data/skeletons/c++.m4                         \
+  data/skeletons/c-like.m4                      \
+  data/skeletons/c-skel.m4                      \
+  data/skeletons/c.m4                           \
+  data/skeletons/glr.c                          \
+  data/skeletons/glr.cc                         \
+  data/skeletons/glr2.cc                        \
+  data/skeletons/java-skel.m4                   \
+  data/skeletons/java.m4                        \
+  data/skeletons/lalr1.cc                       \
+  data/skeletons/lalr1.java                     \
+  data/skeletons/location.cc                    \
+  data/skeletons/stack.hh                       \
+  data/skeletons/traceon.m4                     \
+  data/skeletons/variant.hh                     \
+  data/skeletons/yacc.c
+
+# Experimental support for the D language.
+dist_skeletons_DATA +=                          \
+  data/skeletons/d-skel.m4                      \
+  data/skeletons/d.m4                           \
+  data/skeletons/lalr1.d
+
+m4sugardir = $(pkgdatadir)/m4sugar
+dist_m4sugar_DATA =                             \
+  data/m4sugar/foreach.m4                       \
+  data/m4sugar/m4sugar.m4
+
+xsltdir = $(pkgdatadir)/xslt
+dist_xslt_DATA =                                \
+  data/xslt/bison.xsl                           \
+  data/xslt/xml2dot.xsl                         \
+  data/xslt/xml2text.xsl                        \
+  data/xslt/xml2xhtml.xsl

Engine/bin/bison-flex/data/m4sugar/foreach.m4

@@ -0,0 +1,362 @@
+#                                                  -*- Autoconf -*-
+# This file is part of Autoconf.
+# foreach-based replacements for recursive functions.
+# Speeds up GNU M4 1.4.x by avoiding quadratic $@ recursion, but penalizes
+# GNU M4 1.6 by requiring more memory and macro expansions.
+#
+# Copyright (C) 2008-2017, 2020 Free Software Foundation, Inc.
+
+# This file is part of Autoconf.  This program is free
+# software; you can redistribute it and/or modify it under the
+# terms of the GNU General Public License as published by the
+# Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# Under Section 7 of GPL version 3, you are granted additional
+# permissions described in the Autoconf Configure Script Exception,
+# version 3.0, as published by the Free Software Foundation.
+#
+# You should have received a copy of the GNU General Public License
+# and a copy of the Autoconf Configure Script Exception along with
+# this program; see the files COPYINGv3 and COPYING.EXCEPTION
+# respectively.  If not, see <https://www.gnu.org/licenses/>.
+
+# Written by Eric Blake.
+
+# In M4 1.4.x, every byte of $@ is rescanned.  This means that an
+# algorithm on n arguments that recurses with one less argument each
+# iteration will scan n * (n + 1) / 2 arguments, for O(n^2) time.  In
+# M4 1.6, this was fixed so that $@ is only scanned once, then
+# back-references are made to information stored about the scan.
+# Thus, n iterations need only scan n arguments, for O(n) time.
+# Additionally, in M4 1.4.x, recursive algorithms did not clean up
+# memory very well, requiring O(n^2) memory rather than O(n) for n
+# iterations.
+#
+# This file is designed to overcome the quadratic nature of $@
+# recursion by writing a variant of m4_foreach that uses m4_for rather
+# than $@ recursion to operate on the list.  This involves more macro
+# expansions, but avoids the need to rescan a quadratic number of
+# arguments, making these replacements very attractive for M4 1.4.x.
+# On the other hand, in any version of M4, expanding additional macros
+# costs additional time; therefore, in M4 1.6, where $@ recursion uses
+# fewer macros, these replacements actually pessimize performance.
+# Additionally, the use of $10 to mean the tenth argument violates
+# POSIX; although all versions of m4 1.4.x support this meaning, a
+# future m4 version may switch to take it as the first argument
+# concatenated with a literal 0, so the implementations in this file
+# are not future-proof.  Thus, this file is conditionally included as
+# part of m4_init(), only when it is detected that M4 probably has
+# quadratic behavior (ie. it lacks the macro __m4_version__).
+#
+# Please keep this file in sync with m4sugar.m4.
+
+# _m4_foreach(PRE, POST, IGNORED, ARG...)
+# ---------------------------------------
+# Form the common basis of the m4_foreach and m4_map macros.  For each
+# ARG, expand PRE[ARG]POST[].  The IGNORED argument makes recursion
+# easier, and must be supplied rather than implicit.
+#
+# This version minimizes the number of times that $@ is evaluated by
+# using m4_for to generate a boilerplate into _m4_f then passing $@ to
+# that temporary macro.  Thus, the recursion is done in m4_for without
+# reparsing any user input, and is not quadratic.  For an idea of how
+# this works, note that m4_foreach(i,[1,2],[i]) calls
+#   _m4_foreach([m4_define([i],],[)i],[],[1],[2])
+# which defines _m4_f:
+#   $1[$4]$2[]$1[$5]$2[]_m4_popdef([_m4_f])
+# then calls _m4_f([m4_define([i],],[)i],[],[1],[2]) for a net result:
+#   m4_define([i],[1])i[]m4_define([i],[2])i[]_m4_popdef([_m4_f]).
+m4_define([_m4_foreach],
+[m4_if([$#], [3], [],
+       [m4_pushdef([_m4_f], _m4_for([4], [$#], [1],
+   [$0_([1], [2],], [)])[_m4_popdef([_m4_f])])_m4_f($@)])])
+
+m4_define([_m4_foreach_],
+[[$$1[$$3]$$2[]]])
+
+# m4_case(SWITCH, VAL1, IF-VAL1, VAL2, IF-VAL2, ..., DEFAULT)
+# -----------------------------------------------------------
+# Find the first VAL that SWITCH matches, and expand the corresponding
+# IF-VAL.  If there are no matches, expand DEFAULT.
+#
+# Use m4_for to create a temporary macro in terms of a boilerplate
+# m4_if with final cleanup.  If $# is even, we have DEFAULT; if it is
+# odd, then rounding the last $# up in the temporary macro is
+# harmless.  For example, both m4_case(1,2,3,4,5) and
+# m4_case(1,2,3,4,5,6) result in the intermediate _m4_case being
+#   m4_if([$1],[$2],[$3],[$1],[$4],[$5],_m4_popdef([_m4_case])[$6])
+m4_define([m4_case],
+[m4_if(m4_eval([$# <= 2]), [1], [$2],
+[m4_pushdef([_$0], [m4_if(]_m4_for([2], m4_eval([($# - 1) / 2 * 2]), [2],
+     [_$0_(], [)])[_m4_popdef(
+	 [_$0])]m4_dquote($m4_eval([($# + 1) & ~1]))[)])_$0($@)])])
+
+m4_define([_m4_case_],
+[$0_([1], [$1], m4_incr([$1]))])
+
+m4_define([_m4_case__],
+[[[$$1],[$$2],[$$3],]])
+
+# m4_bmatch(SWITCH, RE1, VAL1, RE2, VAL2, ..., DEFAULT)
+# -----------------------------------------------------
+# m4 equivalent of
+#
+# if (SWITCH =~ RE1)
+#   VAL1;
+# elif (SWITCH =~ RE2)
+#   VAL2;
+# elif ...
+#   ...
+# else
+#   DEFAULT
+#
+# We build the temporary macro _m4_b:
+#   m4_define([_m4_b], _m4_defn([_m4_bmatch]))_m4_b([$1], [$2], [$3])...
+#   _m4_b([$1], [$m-1], [$m])_m4_b([], [], [$m+1]_m4_popdef([_m4_b]))
+# then invoke m4_unquote(_m4_b($@)), for concatenation with later text.
+m4_define([m4_bmatch],
+[m4_if([$#], 0, [m4_fatal([$0: too few arguments: $#])],
+       [$#], 1, [m4_fatal([$0: too few arguments: $#: $1])],
+       [$#], 2, [$2],
+       [m4_pushdef([_m4_b], [m4_define([_m4_b],
+  _m4_defn([_$0]))]_m4_for([3], m4_eval([($# + 1) / 2 * 2 - 1]),
+  [2], [_$0_(], [)])[_m4_b([], [],]m4_dquote([$]m4_eval(
+  [($# + 1) / 2 * 2]))[_m4_popdef([_m4_b]))])m4_unquote(_m4_b($@))])])
+
+m4_define([_m4_bmatch],
+[m4_if(m4_bregexp([$1], [$2]), [-1], [], [[$3]m4_define([$0])])])
+
+m4_define([_m4_bmatch_],
+[$0_([1], m4_decr([$1]), [$1])])
+
+m4_define([_m4_bmatch__],
+[[_m4_b([$$1], [$$2], [$$3])]])
+
+
+# m4_cond(TEST1, VAL1, IF-VAL1, TEST2, VAL2, IF-VAL2, ..., [DEFAULT])
+# -------------------------------------------------------------------
+# Similar to m4_if, except that each TEST is expanded when encountered.
+# If the expansion of TESTn matches the string VALn, the result is IF-VALn.
+# The result is DEFAULT if no tests passed.  This macro allows
+# short-circuiting of expensive tests, where it pays to arrange quick
+# filter tests to run first.
+#
+# m4_cond already guarantees either 3*n or 3*n + 1 arguments, 1 <= n.
+# We only have to speed up _m4_cond, by building the temporary _m4_c:
+#   m4_define([_m4_c], _m4_defn([m4_unquote]))_m4_c([m4_if(($1), [($2)],
+#   [[$3]m4_define([_m4_c])])])_m4_c([m4_if(($4), [($5)],
+#   [[$6]m4_define([_m4_c])])])..._m4_c([m4_if(($m-2), [($m-1)],
+#   [[$m]m4_define([_m4_c])])])_m4_c([[$m+1]]_m4_popdef([_m4_c]))
+# We invoke m4_unquote(_m4_c($@)), for concatenation with later text.
+m4_define([_m4_cond],
+[m4_pushdef([_m4_c], [m4_define([_m4_c],
+  _m4_defn([m4_unquote]))]_m4_for([2], m4_eval([$# / 3 * 3 - 1]), [3],
+  [$0_(], [)])[_m4_c(]m4_dquote(m4_dquote(
+  [$]m4_eval([$# / 3 * 3 + 1])))[_m4_popdef([_m4_c]))])m4_unquote(_m4_c($@))])
+
+m4_define([_m4_cond_],
+[$0_(m4_decr([$1]), [$1], m4_incr([$1]))])
+
+m4_define([_m4_cond__],
+[[_m4_c([m4_if(($$1), [($$2)], [[$$3]m4_define([_m4_c])])])]])
+
+# m4_bpatsubsts(STRING, RE1, SUBST1, RE2, SUBST2, ...)
+# ----------------------------------------------------
+# m4 equivalent of
+#
+#   $_ = STRING;
+#   s/RE1/SUBST1/g;
+#   s/RE2/SUBST2/g;
+#   ...
+#
+# m4_bpatsubsts already validated an odd number of arguments; we only
+# need to speed up _m4_bpatsubsts.  To avoid nesting, we build the
+# temporary _m4_p:
+#   m4_define([_m4_p], [$1])m4_define([_m4_p],
+#   m4_bpatsubst(m4_dquote(_m4_defn([_m4_p])), [$2], [$3]))m4_define([_m4_p],
+#   m4_bpatsubst(m4_dquote(_m4_defn([_m4_p])), [$4], [$5]))m4_define([_m4_p],...
+#   m4_bpatsubst(m4_dquote(_m4_defn([_m4_p])), [$m-1], [$m]))m4_unquote(
+#   _m4_defn([_m4_p])_m4_popdef([_m4_p]))
+m4_define([_m4_bpatsubsts],
+[m4_pushdef([_m4_p], [m4_define([_m4_p],
+  ]m4_dquote([$]1)[)]_m4_for([3], [$#], [2], [$0_(],
+  [)])[m4_unquote(_m4_defn([_m4_p])_m4_popdef([_m4_p]))])_m4_p($@)])
+
+m4_define([_m4_bpatsubsts_],
+[$0_(m4_decr([$1]), [$1])])
+
+m4_define([_m4_bpatsubsts__],
+[[m4_define([_m4_p],
+m4_bpatsubst(m4_dquote(_m4_defn([_m4_p])), [$$1], [$$2]))]])
+
+# m4_shiftn(N, ...)
+# -----------------
+# Returns ... shifted N times.  Useful for recursive "varargs" constructs.
+#
+# m4_shiftn already validated arguments; we only need to speed up
+# _m4_shiftn.  If N is 3, then we build the temporary _m4_s, defined as
+#   ,[$5],[$6],...,[$m]_m4_popdef([_m4_s])
+# before calling m4_shift(_m4_s($@)).
+m4_define([_m4_shiftn],
+[m4_if(m4_incr([$1]), [$#], [], [m4_pushdef([_m4_s],
+  _m4_for(m4_eval([$1 + 2]), [$#], [1],
+  [[,]m4_dquote($], [)])[_m4_popdef([_m4_s])])m4_shift(_m4_s($@))])])
+
+# m4_do(STRING, ...)
+# ------------------
+# This macro invokes all its arguments (in sequence, of course).  It is
+# useful for making your macros more structured and readable by dropping
+# unnecessary dnl's and have the macros indented properly.
+#
+# Here, we use the temporary macro _m4_do, defined as
+#   $1[]$2[]...[]$n[]_m4_popdef([_m4_do])
+m4_define([m4_do],
+[m4_if([$#], [0], [],
+       [m4_pushdef([_$0], _m4_for([1], [$#], [1],
+		   [$], [[[]]])[_m4_popdef([_$0])])_$0($@)])])
+
+# m4_dquote_elt(ARGS)
+# -------------------
+# Return ARGS as an unquoted list of double-quoted arguments.
+#
+# _m4_foreach to the rescue.
+m4_define([m4_dquote_elt],
+[m4_if([$#], [0], [], [[[$1]]_m4_foreach([,m4_dquote(], [)], $@)])])
+
+# m4_reverse(ARGS)
+# ----------------
+# Output ARGS in reverse order.
+#
+# Invoke _m4_r($@) with the temporary _m4_r built as
+#   [$m], [$m-1], ..., [$2], [$1]_m4_popdef([_m4_r])
+m4_define([m4_reverse],
+[m4_if([$#], [0], [], [$#], [1], [[$1]],
+[m4_pushdef([_m4_r], [[$$#]]_m4_for(m4_decr([$#]), [1], [-1],
+    [[, ]m4_dquote($], [)])[_m4_popdef([_m4_r])])_m4_r($@)])])
+
+
+# m4_map_args_pair(EXPRESSION, [END-EXPR = EXPRESSION], ARG...)
+# -------------------------------------------------------------
+# Perform a pairwise grouping of consecutive ARGs, by expanding
+# EXPRESSION([ARG1], [ARG2]).  If there are an odd number of ARGs, the
+# final argument is expanded with END-EXPR([ARGn]).
+#
+# Build the temporary macro _m4_map_args_pair, with the $2([$m+1])
+# only output if $# is odd:
+#   $1([$3], [$4])[]$1([$5], [$6])[]...$1([$m-1],
+#   [$m])[]m4_default([$2], [$1])([$m+1])[]_m4_popdef([_m4_map_args_pair])
+m4_define([m4_map_args_pair],
+[m4_if([$#], [0], [m4_fatal([$0: too few arguments: $#])],
+       [$#], [1], [m4_fatal([$0: too few arguments: $#: $1])],
+       [$#], [2], [],
+       [$#], [3], [m4_default([$2], [$1])([$3])[]],
+       [m4_pushdef([_$0], _m4_for([3],
+   m4_eval([$# / 2 * 2 - 1]), [2], [_$0_(], [)])_$0_end(
+   [1], [2], [$#])[_m4_popdef([_$0])])_$0($@)])])
+
+m4_define([_m4_map_args_pair_],
+[$0_([1], [$1], m4_incr([$1]))])
+
+m4_define([_m4_map_args_pair__],
+[[$$1([$$2], [$$3])[]]])
+
+m4_define([_m4_map_args_pair_end],
+[m4_if(m4_eval([$3 & 1]), [1], [[m4_default([$$2], [$$1])([$$3])[]]])])
+
+# m4_join(SEP, ARG1, ARG2...)
+# ---------------------------
+# Produce ARG1SEPARG2...SEPARGn.  Avoid back-to-back SEP when a given ARG
+# is the empty string.  No expansion is performed on SEP or ARGs.
+#
+# Use a self-modifying separator, since we don't know how many
+# arguments might be skipped before a separator is first printed, but
+# be careful if the separator contains $.  _m4_foreach to the rescue.
+m4_define([m4_join],
+[m4_pushdef([_m4_sep], [m4_define([_m4_sep], _m4_defn([m4_echo]))])]dnl
+[_m4_foreach([_$0([$1],], [)], $@)_m4_popdef([_m4_sep])])
+
+m4_define([_m4_join],
+[m4_if([$2], [], [], [_m4_sep([$1])[$2]])])
+
+# m4_joinall(SEP, ARG1, ARG2...)
+# ------------------------------
+# Produce ARG1SEPARG2...SEPARGn.  An empty ARG results in back-to-back SEP.
+# No expansion is performed on SEP or ARGs.
+#
+# A bit easier than m4_join.  _m4_foreach to the rescue.
+m4_define([m4_joinall],
+[[$2]m4_if(m4_eval([$# <= 2]), [1], [],
+	   [_m4_foreach([$1], [], m4_shift($@))])])
+
+# m4_list_cmp(A, B)
+# -----------------
+# Compare the two lists of integer expressions A and B.
+#
+# m4_list_cmp takes care of any side effects; we only override
+# _m4_list_cmp_raw, where we can safely expand lists multiple times.
+# First, insert padding so that both lists are the same length; the
+# trailing +0 is necessary to handle a missing list.  Next, create a
+# temporary macro to perform pairwise comparisons until an inequality
+# is found.  For example, m4_list_cmp([1], [1,2]) creates _m4_cmp as
+#   m4_if(m4_eval([($1) != ($3)]), [1], [m4_cmp([$1], [$3])],
+#         m4_eval([($2) != ($4)]), [1], [m4_cmp([$2], [$4])],
+#         [0]_m4_popdef([_m4_cmp]))
+# then calls _m4_cmp([1+0], [0*2], [1], [2+0])
+m4_define([_m4_list_cmp_raw],
+[m4_if([$1], [$2], 0,
+       [_m4_list_cmp($1+0_m4_list_pad(m4_count($1), m4_count($2)),
+		     $2+0_m4_list_pad(m4_count($2), m4_count($1)))])])
+
+m4_define([_m4_list_pad],
+[m4_if(m4_eval($1 < $2), [1],
+       [_m4_for(m4_incr([$1]), [$2], [1], [,0*])])])
+
+m4_define([_m4_list_cmp],
+[m4_pushdef([_m4_cmp], [m4_if(]_m4_for(
+   [1], m4_eval([$# >> 1]), [1], [$0_(], [,]m4_eval([$# >> 1])[)])[
+      [0]_m4_popdef([_m4_cmp]))])_m4_cmp($@)])
+
+m4_define([_m4_list_cmp_],
+[$0_([$1], m4_eval([$1 + $2]))])
+
+m4_define([_m4_list_cmp__],
+[[m4_eval([($$1) != ($$2)]), [1], [m4_cmp([$$1], [$$2])],
+]])
+
+# m4_max(EXPR, ...)
+# m4_min(EXPR, ...)
+# -----------------
+# Return the decimal value of the maximum (or minimum) in a series of
+# integer expressions.
+#
+# _m4_foreach to the rescue; we only need to replace _m4_minmax.  Here,
+# we need a temporary macro to track the best answer so far, so that
+# the foreach expression is tractable.
+m4_define([_m4_minmax],
+[m4_pushdef([_m4_best], m4_eval([$2]))_m4_foreach(
+  [m4_define([_m4_best], $1(_m4_best,], [))], m4_shift($@))]dnl
+[_m4_best[]_m4_popdef([_m4_best])])
+
+# m4_set_add_all(SET, VALUE...)
+# -----------------------------
+# Add each VALUE into SET.  This is O(n) in the number of VALUEs, and
+# can be faster than calling m4_set_add for each VALUE.
+#
+# _m4_foreach to the rescue.  If no deletions have occurred, then
+# avoid the speed penalty of m4_set_add.
+m4_define([m4_set_add_all],
+[m4_if([$#], [0], [], [$#], [1], [],
+       [m4_define([_m4_set_size($1)], m4_eval(m4_set_size([$1])
+	  + m4_len(_m4_foreach(m4_ifdef([_m4_set_cleanup($1)],
+  [[m4_set_add]], [[_$0]])[([$1],], [)], $@))))])])
+
+m4_define([_m4_set_add_all],
+[m4_ifdef([_m4_set([$1],$2)], [],
+	  [m4_define([_m4_set([$1],$2)],
+		     [1])m4_pushdef([_m4_set([$1])], [$2])-])])

Engine/bin/bison-flex/data/skeletons/c++-skel.m4

@@ -0,0 +1,27 @@
+                                                            -*- Autoconf -*-
+
+# C++ skeleton dispatching for Bison.
+
+# Copyright (C) 2006-2007, 2009-2015, 2018-2021 Free Software
+# Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+b4_glr_if(             [m4_define([b4_used_skeleton], [b4_skeletonsdir/[glr.cc]])])
+b4_nondeterministic_if([m4_define([b4_used_skeleton], [b4_skeletonsdir/[glr.cc]])])
+
+m4_define_default([b4_used_skeleton], [b4_skeletonsdir/[lalr1.cc]])
+m4_define_default([b4_skeleton], ["b4_basename(b4_used_skeleton)"])
+
+m4_include(b4_used_skeleton)

Engine/bin/bison-flex/data/skeletons/c++.m4

@@ -0,0 +1,778 @@
+                                                            -*- Autoconf -*-
+
+# C++ skeleton for Bison
+
+# Copyright (C) 2002-2021 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+# Sanity checks, before defaults installed by c.m4.
+b4_percent_define_ifdef([[api.value.union.name]],
+  [b4_complain_at(b4_percent_define_get_loc([[api.value.union.name]]),
+                  [named %union is invalid in C++])])
+
+b4_percent_define_default([[api.symbol.prefix]], [[S_]])
+
+m4_include(b4_skeletonsdir/[c.m4])
+
+b4_percent_define_check_kind([api.namespace], [code], [deprecated])
+b4_percent_define_check_kind([api.parser.class], [code], [deprecated])
+
+
+## ----- ##
+## C++.  ##
+## ----- ##
+
+# b4_comment(TEXT, [PREFIX])
+# --------------------------
+# Put TEXT in comment. Prefix all the output lines with PREFIX.
+m4_define([b4_comment],
+[_b4_comment([$1], [$2// ], [$2// ])])
+
+
+# b4_inline(hh|cc)
+# ----------------
+# Expand to `inline\n  ` if $1 is hh.
+m4_define([b4_inline],
+[m4_case([$1],
+  [cc], [],
+  [hh], [[inline
+  ]],
+  [m4_fatal([$0: invalid argument: $1])])])
+
+
+# b4_cxx_portability
+# ------------------
+m4_define([b4_cxx_portability],
+[#if defined __cplusplus
+# define YY_CPLUSPLUS __cplusplus
+#else
+# define YY_CPLUSPLUS 199711L
+#endif
+
+// Support move semantics when possible.
+#if 201103L <= YY_CPLUSPLUS
+# define YY_MOVE           std::move
+# define YY_MOVE_OR_COPY   move
+# define YY_MOVE_REF(Type) Type&&
+# define YY_RVREF(Type)    Type&&
+# define YY_COPY(Type)     Type
+#else
+# define YY_MOVE
+# define YY_MOVE_OR_COPY   copy
+# define YY_MOVE_REF(Type) Type&
+# define YY_RVREF(Type)    const Type&
+# define YY_COPY(Type)     const Type&
+#endif
+
+// Support noexcept when possible.
+#if 201103L <= YY_CPLUSPLUS
+# define YY_NOEXCEPT noexcept
+# define YY_NOTHROW
+#else
+# define YY_NOEXCEPT
+# define YY_NOTHROW throw ()
+#endif
+
+// Support constexpr when possible.
+#if 201703 <= YY_CPLUSPLUS
+# define YY_CONSTEXPR constexpr
+#else
+# define YY_CONSTEXPR
+#endif[]dnl
+])
+
+
+## ---------------- ##
+## Default values.  ##
+## ---------------- ##
+
+b4_percent_define_default([[api.parser.class]], [[parser]])
+
+# Don't do that so that we remember whether we're using a user
+# request, or the default value.
+#
+# b4_percent_define_default([[api.location.type]], [[location]])
+
+b4_percent_define_default([[api.filename.type]], [[const std::string]])
+# Make it a warning for those who used betas of Bison 3.0.
+b4_percent_define_default([[api.namespace]], m4_defn([b4_prefix]))
+
+b4_percent_define_default([[define_location_comparison]],
+                          [m4_if(b4_percent_define_get([[filename_type]]),
+                                 [std::string], [[true]], [[false]])])
+
+
+
+## ----------- ##
+## Namespace.  ##
+## ----------- ##
+
+m4_define([b4_namespace_ref], [b4_percent_define_get([[api.namespace]])])
+
+
+# Don't permit an empty b4_namespace_ref.  Any '::parser::foo' appended to it
+# would compile as an absolute reference with 'parser' in the global namespace.
+# b4_namespace_open would open an anonymous namespace and thus establish
+# internal linkage.  This would compile.  However, it's cryptic, and internal
+# linkage for the parser would be specified in all translation units that
+# include the header, which is always generated.  If we ever need to permit
+# internal linkage somehow, surely we can find a cleaner approach.
+m4_if(m4_bregexp(b4_namespace_ref, [^[	 ]*$]), [-1], [],
+[b4_complain_at(b4_percent_define_get_loc([[api.namespace]]),
+                [[namespace reference is empty]])])
+
+# Instead of assuming the C++ compiler will do it, Bison should reject any
+# invalid b4_namespace_ref that would be converted to a valid
+# b4_namespace_open.  The problem is that Bison doesn't always output
+# b4_namespace_ref to uncommented code but should reserve the ability to do so
+# in future releases without risking breaking any existing user grammars.
+# Specifically, don't allow empty names as b4_namespace_open would just convert
+# those into anonymous namespaces, and that might tempt some users.
+m4_if(m4_bregexp(b4_namespace_ref, [::[	 ]*::]), [-1], [],
+[b4_complain_at(b4_percent_define_get_loc([[api.namespace]]),
+                [[namespace reference has consecutive "::"]])])
+m4_if(m4_bregexp(b4_namespace_ref, [::[	 ]*$]), [-1], [],
+[b4_complain_at(b4_percent_define_get_loc([[api.namespace]]),
+                [[namespace reference has a trailing "::"]])])
+
+m4_define([b4_namespace_open],
+[b4_user_code([b4_percent_define_get_syncline([[api.namespace]])dnl
+[namespace ]m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref),
+                                                [^\(.\)[	 ]*::], [\1])),
+                         [::], [ { namespace ])[ {]])])
+
+m4_define([b4_namespace_close],
+[b4_user_code([b4_percent_define_get_syncline([[api.namespace]])dnl
+m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref[ ]),
+                                    [^\(.\)[	 ]*\(::\)?\([^][:]\|:[^:]\)*],
+                                    [\1])),
+             [::\([^][:]\|:[^:]\)*], [} ])[} // ]b4_namespace_ref])])
+
+
+## ------------- ##
+## Token kinds.  ##
+## ------------- ##
+
+
+# b4_token_enums
+# --------------
+# Output the definition of the token kinds.
+m4_define([b4_token_enums],
+[[enum token_kind_type
+      {
+        ]b4_symbol([-2], [id])[ = -2,
+]b4_symbol_foreach([b4_token_enum])dnl
+[      };]dnl
+])
+
+
+
+## -------------- ##
+## Symbol kinds.  ##
+## -------------- ##
+
+# b4_declare_symbol_enum
+# ----------------------
+# The definition of the symbol internal numbers as an enum.
+# Defining YYEMPTY here is important: it forces the compiler
+# to use a signed type, which matters for yytoken.
+m4_define([b4_declare_symbol_enum],
+[[enum symbol_kind_type
+      {
+        YYNTOKENS = ]b4_tokens_number[, ///< Number of tokens.
+        ]b4_symbol(empty, kind_base)[ = -2,
+]b4_symbol_foreach([      b4_symbol_enum])dnl
+[      };]])
+
+
+
+## ----------------- ##
+## Semantic Values.  ##
+## ----------------- ##
+
+
+
+# b4_value_type_declare
+# ---------------------
+# Declare value_type.
+m4_define([b4_value_type_declare],
+[b4_value_type_setup[]dnl
+[    /// Symbol semantic values.
+]m4_bmatch(b4_percent_define_get_kind([[api.value.type]]),
+[code],
+[[    typedef ]b4_percent_define_get([[api.value.type]])[ value_type;]],
+[m4_bmatch(b4_percent_define_get([[api.value.type]]),
+[union\|union-directive],
+[[    union value_type
+    {
+]b4_user_union_members[
+    };]])])dnl
+])
+
+
+# b4_public_types_declare
+# -----------------------
+# Define the public types: token, semantic value, location, and so forth.
+# Depending on %define token_lex, may be output in the header or source file.
+m4_define([b4_public_types_declare],
+[b4_glr2_cc_if(
+[b4_value_type_declare],
+[[#ifdef ]b4_api_PREFIX[STYPE
+# ifdef __GNUC__
+#  pragma GCC message "bison: do not #define ]b4_api_PREFIX[STYPE in C++, use %define api.value.type"
+# endif
+    typedef ]b4_api_PREFIX[STYPE value_type;
+#else
+]b4_value_type_declare[
+#endif
+    /// Backward compatibility (Bison 3.8).
+    typedef value_type semantic_type;
+]])[]b4_locations_if([
+    /// Symbol locations.
+    typedef b4_percent_define_get([[api.location.type]],
+                                  [[location]]) location_type;])[
+
+    /// Syntax errors thrown from user actions.
+    struct syntax_error : std::runtime_error
+    {
+      syntax_error (]b4_locations_if([const location_type& l, ])[const std::string& m)
+        : std::runtime_error (m)]b4_locations_if([
+        , location (l)])[
+      {}
+
+      syntax_error (const syntax_error& s)
+        : std::runtime_error (s.what ())]b4_locations_if([
+        , location (s.location)])[
+      {}
+
+      ~syntax_error () YY_NOEXCEPT YY_NOTHROW;]b4_locations_if([
+
+      location_type location;])[
+    };
+
+    /// Token kinds.
+    struct token
+    {
+      ]b4_token_enums[]b4_glr2_cc_if([], [[
+      /// Backward compatibility alias (Bison 3.6).
+      typedef token_kind_type yytokentype;]])[
+    };
+
+    /// Token kind, as returned by yylex.
+    typedef token::token_kind_type token_kind_type;]b4_glr2_cc_if([], [[
+
+    /// Backward compatibility alias (Bison 3.6).
+    typedef token_kind_type token_type;]])[
+
+    /// Symbol kinds.
+    struct symbol_kind
+    {
+      ]b4_declare_symbol_enum[
+    };
+
+    /// (Internal) symbol kind.
+    typedef symbol_kind::symbol_kind_type symbol_kind_type;
+
+    /// The number of tokens.
+    static const symbol_kind_type YYNTOKENS = symbol_kind::YYNTOKENS;
+]])
+
+
+# b4_symbol_type_define
+# ---------------------
+# Define symbol_type, the external type for symbols used for symbol
+# constructors.
+m4_define([b4_symbol_type_define],
+[[    /// A complete symbol.
+    ///
+    /// Expects its Base type to provide access to the symbol kind
+    /// via kind ().
+    ///
+    /// Provide access to semantic value]b4_locations_if([ and location])[.
+    template <typename Base>
+    struct basic_symbol : Base
+    {
+      /// Alias to Base.
+      typedef Base super_type;
+
+      /// Default constructor.
+      basic_symbol () YY_NOEXCEPT
+        : value ()]b4_locations_if([
+        , location ()])[
+      {}
+
+#if 201103L <= YY_CPLUSPLUS
+      /// Move constructor.
+      basic_symbol (basic_symbol&& that)
+        : Base (std::move (that))
+        , value (]b4_variant_if([], [std::move (that.value)]))b4_locations_if([
+        , location (std::move (that.location))])[
+      {]b4_variant_if([
+        b4_symbol_variant([this->kind ()], [value], [move],
+                          [std::move (that.value)])
+      ])[}
+#endif
+
+      /// Copy constructor.
+      basic_symbol (const basic_symbol& that);]b4_variant_if([[
+
+      /// Constructors for typed symbols.
+]b4_type_foreach([b4_basic_symbol_constructor_define], [
+])], [[
+      /// Constructor for valueless symbols.
+      basic_symbol (typename Base::kind_type t]b4_locations_if([,
+                    YY_MOVE_REF (location_type) l])[);
+
+      /// Constructor for symbols with semantic value.
+      basic_symbol (typename Base::kind_type t,
+                    YY_RVREF (value_type) v]b4_locations_if([,
+                    YY_RVREF (location_type) l])[);
+]])[
+      /// Destroy the symbol.
+      ~basic_symbol ()
+      {
+        clear ();
+      }
+
+]b4_glr2_cc_if([[
+      /// Copy assignment.
+      basic_symbol& operator= (const basic_symbol& that)
+      {
+        Base::operator= (that);]b4_variant_if([[
+        ]b4_symbol_variant([this->kind ()], [value], [copy],
+                           [that.value])], [[
+        value = that.value]])[;]b4_locations_if([[
+        location = that.location;]])[
+        return *this;
+      }
+
+      /// Move assignment.
+      basic_symbol& operator= (basic_symbol&& that)
+      {
+        Base::operator= (std::move (that));]b4_variant_if([[
+        ]b4_symbol_variant([this->kind ()], [value], [move],
+                           [std::move (that.value)])], [[
+        value = std::move (that.value)]])[;]b4_locations_if([[
+        location = std::move (that.location);]])[
+        return *this;
+      }
+]])[
+
+      /// Destroy contents, and record that is empty.
+      void clear () YY_NOEXCEPT
+      {]b4_variant_if([[
+        // User destructor.
+        symbol_kind_type yykind = this->kind ();
+        basic_symbol<Base>& yysym = *this;
+        (void) yysym;
+        switch (yykind)
+        {
+]b4_symbol_foreach([b4_symbol_destructor])dnl
+[       default:
+          break;
+        }
+
+        // Value type destructor.
+]b4_symbol_variant([[yykind]], [[value]], [[template destroy]])])[
+        Base::clear ();
+      }
+
+]b4_parse_error_bmatch(
+[custom\|detailed],
+[[      /// The user-facing name of this symbol.
+      const char *name () const YY_NOEXCEPT
+      {
+        return ]b4_parser_class[::symbol_name (this->kind ());
+      }]],
+[simple],
+[[#if ]b4_api_PREFIX[DEBUG || ]b4_token_table_flag[
+      /// The user-facing name of this symbol.
+      const char *name () const YY_NOEXCEPT
+      {
+        return ]b4_parser_class[::symbol_name (this->kind ());
+      }
+#endif // #if ]b4_api_PREFIX[DEBUG || ]b4_token_table_flag[
+]],
+[verbose],
+[[      /// The user-facing name of this symbol.
+      std::string name () const YY_NOEXCEPT
+      {
+        return ]b4_parser_class[::symbol_name (this->kind ());
+      }]])[]b4_glr2_cc_if([], [[
+
+      /// Backward compatibility (Bison 3.6).
+      symbol_kind_type type_get () const YY_NOEXCEPT;]])[
+
+      /// Whether empty.
+      bool empty () const YY_NOEXCEPT;
+
+      /// Destructive move, \a s is emptied into this.
+      void move (basic_symbol& s);
+
+      /// The semantic value.
+      value_type value;]b4_locations_if([
+
+      /// The location.
+      location_type location;])[
+
+    private:
+#if YY_CPLUSPLUS < 201103L
+      /// Assignment operator.
+      basic_symbol& operator= (const basic_symbol& that);
+#endif
+    };
+
+    /// Type access provider for token (enum) based symbols.
+    struct by_kind
+    {
+      /// The symbol kind as needed by the constructor.
+      typedef token_kind_type kind_type;
+
+      /// Default constructor.
+      by_kind () YY_NOEXCEPT;
+
+#if 201103L <= YY_CPLUSPLUS
+      /// Move constructor.
+      by_kind (by_kind&& that) YY_NOEXCEPT;
+#endif
+
+      /// Copy constructor.
+      by_kind (const by_kind& that) YY_NOEXCEPT;
+
+      /// Constructor from (external) token numbers.
+      by_kind (kind_type t) YY_NOEXCEPT;
+
+]b4_glr2_cc_if([[
+      /// Copy assignment.
+      by_kind& operator= (const by_kind& that);
+
+      /// Move assignment.
+      by_kind& operator= (by_kind&& that);
+]])[
+
+      /// Record that this symbol is empty.
+      void clear () YY_NOEXCEPT;
+
+      /// Steal the symbol kind from \a that.
+      void move (by_kind& that);
+
+      /// The (internal) type number (corresponding to \a type).
+      /// \a empty when empty.
+      symbol_kind_type kind () const YY_NOEXCEPT;]b4_glr2_cc_if([], [[
+
+      /// Backward compatibility (Bison 3.6).
+      symbol_kind_type type_get () const YY_NOEXCEPT;]])[
+
+      /// The symbol kind.
+      /// \a ]b4_symbol_prefix[YYEMPTY when empty.
+      symbol_kind_type kind_;
+    };]b4_glr2_cc_if([], [[
+
+    /// Backward compatibility for a private implementation detail (Bison 3.6).
+    typedef by_kind by_type;]])[
+
+    /// "External" symbols: returned by the scanner.
+    struct symbol_type : basic_symbol<by_kind>
+    {]b4_variant_if([[
+      /// Superclass.
+      typedef basic_symbol<by_kind> super_type;
+
+      /// Empty symbol.
+      symbol_type () YY_NOEXCEPT {}
+
+      /// Constructor for valueless symbols, and symbols from each type.
+]b4_type_foreach([_b4_symbol_constructor_define])dnl
+    ])[};
+]])
+
+
+# b4_public_types_define(hh|cc)
+# -----------------------------
+# Provide the implementation needed by the public types.
+m4_define([b4_public_types_define],
+[[  // basic_symbol.
+  template <typename Base>
+  ]b4_parser_class[::basic_symbol<Base>::basic_symbol (const basic_symbol& that)
+    : Base (that)
+    , value (]b4_variant_if([], [that.value]))b4_locations_if([
+    , location (that.location)])[
+  {]b4_variant_if([
+    b4_symbol_variant([this->kind ()], [value], [copy],
+                      [YY_MOVE (that.value)])
+  ])[}
+
+]b4_variant_if([], [[
+  /// Constructor for valueless symbols.
+  template <typename Base>
+  ]b4_parser_class[::basic_symbol<Base>::basic_symbol (]b4_join(
+          [typename Base::kind_type t],
+          b4_locations_if([YY_MOVE_REF (location_type) l]))[)
+    : Base (t)
+    , value ()]b4_locations_if([
+    , location (l)])[
+  {}
+
+  template <typename Base>
+  ]b4_parser_class[::basic_symbol<Base>::basic_symbol (]b4_join(
+          [typename Base::kind_type t],
+          [YY_RVREF (value_type) v],
+          b4_locations_if([YY_RVREF (location_type) l]))[)
+    : Base (t)
+    , value (]b4_variant_if([], [YY_MOVE (v)])[)]b4_locations_if([
+    , location (YY_MOVE (l))])[
+  {]b4_variant_if([[
+    (void) v;
+    ]b4_symbol_variant([this->kind ()], [value], [YY_MOVE_OR_COPY], [YY_MOVE (v)])])[}]])[
+
+]b4_glr2_cc_if([], [[
+  template <typename Base>
+  ]b4_parser_class[::symbol_kind_type
+  ]b4_parser_class[::basic_symbol<Base>::type_get () const YY_NOEXCEPT
+  {
+    return this->kind ();
+  }
+]])[
+
+  template <typename Base>
+  bool
+  ]b4_parser_class[::basic_symbol<Base>::empty () const YY_NOEXCEPT
+  {
+    return this->kind () == ]b4_symbol(empty, kind)[;
+  }
+
+  template <typename Base>
+  void
+  ]b4_parser_class[::basic_symbol<Base>::move (basic_symbol& s)
+  {
+    super_type::move (s);
+    ]b4_variant_if([b4_symbol_variant([this->kind ()], [value], [move],
+                                      [YY_MOVE (s.value)])],
+                   [value = YY_MOVE (s.value);])[]b4_locations_if([
+    location = YY_MOVE (s.location);])[
+  }
+
+  // by_kind.
+  ]b4_inline([$1])b4_parser_class[::by_kind::by_kind () YY_NOEXCEPT
+    : kind_ (]b4_symbol(empty, kind)[)
+  {}
+
+#if 201103L <= YY_CPLUSPLUS
+  ]b4_inline([$1])b4_parser_class[::by_kind::by_kind (by_kind&& that) YY_NOEXCEPT
+    : kind_ (that.kind_)
+  {
+    that.clear ();
+  }
+#endif
+
+  ]b4_inline([$1])b4_parser_class[::by_kind::by_kind (const by_kind& that) YY_NOEXCEPT
+    : kind_ (that.kind_)
+  {}
+
+  ]b4_inline([$1])b4_parser_class[::by_kind::by_kind (token_kind_type t) YY_NOEXCEPT
+    : kind_ (yytranslate_ (t))
+  {}
+
+]b4_glr2_cc_if([[
+  ]b4_inline([$1])]b4_parser_class[::by_kind&
+  b4_parser_class[::by_kind::by_kind::operator= (const by_kind& that)
+  {
+    kind_ = that.kind_;
+    return *this;
+  }
+
+  ]b4_inline([$1])]b4_parser_class[::by_kind&
+  b4_parser_class[::by_kind::by_kind::operator= (by_kind&& that)
+  {
+    kind_ = that.kind_;
+    that.clear ();
+    return *this;
+  }
+]])[
+
+  ]b4_inline([$1])[void
+  ]b4_parser_class[::by_kind::clear () YY_NOEXCEPT
+  {
+    kind_ = ]b4_symbol(empty, kind)[;
+  }
+
+  ]b4_inline([$1])[void
+  ]b4_parser_class[::by_kind::move (by_kind& that)
+  {
+    kind_ = that.kind_;
+    that.clear ();
+  }
+
+  ]b4_inline([$1])[]b4_parser_class[::symbol_kind_type
+  ]b4_parser_class[::by_kind::kind () const YY_NOEXCEPT
+  {
+    return kind_;
+  }
+
+]b4_glr2_cc_if([], [[
+  ]b4_inline([$1])[]b4_parser_class[::symbol_kind_type
+  ]b4_parser_class[::by_kind::type_get () const YY_NOEXCEPT
+  {
+    return this->kind ();
+  }
+]])[
+]])
+
+
+# b4_token_constructor_define
+# ----------------------------
+# Define make_FOO for all the token kinds.
+# Use at class-level.  Redefined in variant.hh.
+m4_define([b4_token_constructor_define], [])
+
+
+# b4_yytranslate_define(cc|hh)
+# ----------------------------
+# Define yytranslate_.  Sometimes used in the header file ($1=hh),
+# sometimes in the cc file.
+m4_define([b4_yytranslate_define],
+[  b4_inline([$1])b4_parser_class[::symbol_kind_type
+  ]b4_parser_class[::yytranslate_ (int t) YY_NOEXCEPT
+  {
+]b4_api_token_raw_if(
+[[    return static_cast<symbol_kind_type> (t);]],
+[[    // YYTRANSLATE[TOKEN-NUM] -- Symbol number corresponding to
+    // TOKEN-NUM as returned by yylex.
+    static
+    const ]b4_int_type_for([b4_translate])[
+    translate_table[] =
+    {
+  ]b4_translate[
+    };
+    // Last valid token kind.
+    const int code_max = ]b4_code_max[;
+
+    if (t <= 0)
+      return symbol_kind::]b4_symbol_prefix[YYEOF;
+    else if (t <= code_max)
+      return static_cast <symbol_kind_type> (translate_table[t]);
+    else
+      return symbol_kind::]b4_symbol_prefix[YYUNDEF;]])[
+  }
+]])
+
+
+# b4_lhs_value([TYPE])
+# --------------------
+m4_define([b4_lhs_value],
+[b4_symbol_value([yyval], [$1])])
+
+
+# b4_rhs_value(RULE-LENGTH, POS, [TYPE])
+# --------------------------------------
+# FIXME: Dead code.
+m4_define([b4_rhs_value],
+[b4_symbol_value([yysemantic_stack_@{($1) - ($2)@}], [$3])])
+
+
+# b4_lhs_location()
+# -----------------
+# Expansion of @$.
+m4_define([b4_lhs_location],
+[(yyloc)])
+
+
+# b4_rhs_location(RULE-LENGTH, POS)
+# ---------------------------------
+# Expansion of @POS, where the current rule has RULE-LENGTH symbols
+# on RHS.
+m4_define([b4_rhs_location],
+[(yylocation_stack_@{($1) - ($2)@})])
+
+
+# b4_parse_param_decl
+# -------------------
+# Extra formal arguments of the constructor.
+# Change the parameter names from "foo" into "foo_yyarg", so that
+# there is no collision bw the user chosen attribute name, and the
+# argument name in the constructor.
+m4_define([b4_parse_param_decl],
+[m4_ifset([b4_parse_param],
+          [m4_map_sep([b4_parse_param_decl_1], [, ], [b4_parse_param])])])
+
+m4_define([b4_parse_param_decl_1],
+[$1_yyarg])
+
+
+
+# b4_parse_param_cons
+# -------------------
+# Extra initialisations of the constructor.
+m4_define([b4_parse_param_cons],
+          [m4_ifset([b4_parse_param],
+                    [
+      b4_cc_constructor_calls(b4_parse_param)])])
+m4_define([b4_cc_constructor_calls],
+          [m4_map_sep([b4_cc_constructor_call], [,
+      ], [$@])])
+m4_define([b4_cc_constructor_call],
+          [$2 ($2_yyarg)])
+
+# b4_parse_param_vars
+# -------------------
+# Extra instance variables.
+m4_define([b4_parse_param_vars],
+          [m4_ifset([b4_parse_param],
+                    [
+    // User arguments.
+b4_cc_var_decls(b4_parse_param)])])
+m4_define([b4_cc_var_decls],
+          [m4_map_sep([b4_cc_var_decl], [
+], [$@])])
+m4_define([b4_cc_var_decl],
+          [    $1;])
+
+
+## ---------##
+## Values.  ##
+## ---------##
+
+# b4_yylloc_default_define
+# ------------------------
+# Define YYLLOC_DEFAULT.
+m4_define([b4_yylloc_default_define],
+[[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
+   If N is 0, then set CURRENT to the empty location which ends
+   the previous symbol: RHS[0] (always defined).  */
+
+# ifndef YYLLOC_DEFAULT
+#  define YYLLOC_DEFAULT(Current, Rhs, N)                               \
+    do                                                                  \
+      if (N)                                                            \
+        {                                                               \
+          (Current).begin  = YYRHSLOC (Rhs, 1).begin;                   \
+          (Current).end    = YYRHSLOC (Rhs, N).end;                     \
+        }                                                               \
+      else                                                              \
+        {                                                               \
+          (Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end;      \
+        }                                                               \
+    while (false)
+# endif
+]])
+
+## -------- ##
+## Checks.  ##
+## -------- ##
+
+b4_token_ctor_if([b4_variant_if([],
+  [b4_fatal_at(b4_percent_define_get_loc(api.token.constructor),
+               [cannot use '%s' without '%s'],
+               [%define api.token.constructor],
+               [%define api.value.type variant]))])])

Engine/bin/bison-flex/data/skeletons/c-like.m4

@@ -0,0 +1,72 @@
+                                                            -*- Autoconf -*-
+
+# Common code for C-like languages (C, C++, Java, etc.)
+
+# Copyright (C) 2012-2015, 2018-2021 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+
+# _b4_comment(TEXT, OPEN, CONTINUE, END)
+# --------------------------------------
+# Put TEXT in comment.  Avoid trailing spaces: don't indent empty lines.
+# Avoid adding indentation to the first line, as the indentation comes
+# from OPEN.  That's why we don't patsubst([$1], [^\(.\)], [   \1]).
+# Turn "*/" in TEXT into "* /" so that we don't unexpectedly close
+# the comments before its end.
+#
+# Prefix all the output lines with PREFIX.
+m4_define([_b4_comment],
+[$2[]b4_gsub(m4_expand([$1]),
+            [[*]/], [*\\/],
+            [/[*]], [/\\*],
+            [
+\(.\)], [
+$3\1])$4])
+
+
+# b4_comment(TEXT, [PREFIX])
+# --------------------------
+# Put TEXT in comment.  Prefix all the output lines with PREFIX.
+m4_define([b4_comment],
+[_b4_comment([$1], [$2/* ], [$2   ], [  */])])
+
+
+
+
+# _b4_dollar_dollar(VALUE, SYMBOL-NUM, FIELD, DEFAULT-FIELD)
+# ----------------------------------------------------------
+# If FIELD (or DEFAULT-FIELD) is non-null, return "VALUE.FIELD",
+# otherwise just VALUE.  Be sure to pass "(VALUE)" if VALUE is a
+# pointer.
+m4_define([_b4_dollar_dollar],
+[b4_symbol_value([$1],
+                 [$2],
+                 m4_if([$3], [[]],
+                       [[$4]], [[$3]]))])
+
+# b4_dollar_pushdef(VALUE-POINTER, SYMBOL-NUM, [TYPE_TAG], LOCATION)
+# b4_dollar_popdef
+# ------------------------------------------------------------------
+# Define b4_dollar_dollar for VALUE-POINTER and DEFAULT-FIELD,
+# and b4_at_dollar for LOCATION.
+m4_define([b4_dollar_pushdef],
+[m4_pushdef([b4_dollar_dollar],
+            [_b4_dollar_dollar([$1], [$2], m4_dquote($][1), [$3])])dnl
+m4_pushdef([b4_at_dollar], [$4])dnl
+])
+m4_define([b4_dollar_popdef],
+[m4_popdef([b4_at_dollar])dnl
+m4_popdef([b4_dollar_dollar])dnl
+])

Engine/bin/bison-flex/data/skeletons/c-skel.m4

@@ -0,0 +1,27 @@
+                                                            -*- Autoconf -*-
+
+# C skeleton dispatching for Bison.
+
+# Copyright (C) 2006-2007, 2009-2015, 2018-2021 Free Software
+# Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+b4_glr_if(             [m4_define([b4_used_skeleton], [b4_skeletonsdir/[glr.c]])])
+b4_nondeterministic_if([m4_define([b4_used_skeleton], [b4_skeletonsdir/[glr.c]])])
+
+m4_define_default([b4_used_skeleton], [b4_skeletonsdir/[yacc.c]])
+m4_define_default([b4_skeleton], ["b4_basename(b4_used_skeleton)"])
+
+m4_include(b4_used_skeleton)

Engine/bin/bison-flex/data/skeletons/d-skel.m4

@@ -0,0 +1,26 @@
+                                                            -*- Autoconf -*-
+
+# D skeleton dispatching for Bison.
+
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+b4_glr_if(             [b4_complain([%%glr-parser not supported for D])])
+b4_nondeterministic_if([b4_complain([%%nondeterministic-parser not supported for D])])
+
+m4_define_default([b4_used_skeleton], [b4_skeletonsdir/[lalr1.d]])
+m4_define_default([b4_skeleton], ["b4_basename(b4_used_skeleton)"])
+
+m4_include(b4_used_skeleton)

Engine/bin/bison-flex/data/skeletons/d.m4

@@ -0,0 +1,628 @@
+                                                            -*- Autoconf -*-
+
+# D language support for Bison
+
+# Copyright (C) 2018-2021 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+
+m4_include(b4_skeletonsdir/[c-like.m4])
+
+
+# b4_symbol_action(SYMBOL-NUM, ACTION)
+# ------------------------------------
+# Run the action ACTION ("destructor" or "printer") for SYMBOL-NUM.
+m4_define([b4_symbol_action],
+[b4_symbol_if([$1], [has_$2],
+[b4_dollar_pushdef([yyval],
+                   [$1],
+                   [],
+                   [yyloc])dnl
+    _b4_symbol_case([$1])[]dnl
+b4_syncline([b4_symbol([$1], [$2_line])], [b4_symbol([$1], [$2_file])])dnl
+b4_symbol([$1], [$2])
+b4_syncline([@oline@], [@ofile@])dnl
+        break;
+
+b4_dollar_popdef[]dnl
+])])
+
+
+# b4_use(EXPR)
+# ------------
+# Pacify the compiler about some maybe unused value.
+m4_define([b4_use],
+[])
+
+
+# b4_sync_start(LINE, FILE)
+# -------------------------
+m4_define([b4_sync_start], [[#]line $1 $2])
+
+
+# b4_list2(LIST1, LIST2)
+# ----------------------
+# Join two lists with a comma if necessary.
+m4_define([b4_list2],
+          [$1[]m4_ifval(m4_quote($1), [m4_ifval(m4_quote($2), [[, ]])])[]$2])
+
+
+# b4_percent_define_get3(DEF, PRE, POST, NOT)
+# -------------------------------------------
+# Expand to the value of DEF surrounded by PRE and POST if it's %define'ed,
+# otherwise NOT.
+m4_define([b4_percent_define_get3],
+          [m4_ifval(m4_quote(b4_percent_define_get([$1])),
+                [$2[]b4_percent_define_get([$1])[]$3], [$4])])
+
+# b4_percent_define_if_get2(ARG1, ARG2, DEF, NOT)
+# -----------------------------------------------
+# Expand to the value of DEF if ARG1 or ARG2 are %define'ed,
+# otherwise NOT.
+m4_define([b4_percent_define_if_get2],
+          [m4_ifval(m4_quote(b4_percent_define_get([$1])),
+                [$3], [m4_ifval(m4_quote(b4_percent_define_get([$2])),
+                      [$3], [$4])])])
+
+# b4_percent_define_class_before_interface(CLASS, INTERFACE)
+# ----------------------------------------------------------
+# Expand to a ', ' if both a class and an interface have been %define'ed
+m4_define([b4_percent_define_class_before_interface],
+          [m4_ifval(m4_quote(b4_percent_define_get([$1])),
+                [m4_ifval(m4_quote(b4_percent_define_get([$2])),
+                      [, ])])])
+
+
+# b4_flag_value(BOOLEAN-FLAG)
+# ---------------------------
+m4_define([b4_flag_value], [b4_flag_if([$1], [true], [false])])
+
+
+# b4_parser_class_declaration
+# ---------------------------
+# The declaration of the parser class ("class YYParser"), with all its
+# qualifiers/annotations.
+b4_percent_define_default([[api.parser.abstract]], [[false]])
+b4_percent_define_default([[api.parser.final]],    [[false]])
+b4_percent_define_default([[api.parser.public]],   [[false]])
+
+m4_define([b4_parser_class_declaration],
+[b4_percent_define_get3([api.parser.annotations], [], [ ])dnl
+b4_percent_define_flag_if([api.parser.public],   [public ])dnl
+b4_percent_define_flag_if([api.parser.abstract], [abstract ])dnl
+b4_percent_define_flag_if([api.parser.final],    [final ])dnl
+[class ]b4_parser_class[]dnl
+b4_percent_define_if_get2([api.parser.extends], [api.parser.implements], [ : ])dnl
+b4_percent_define_get([api.parser.extends])dnl
+b4_percent_define_class_before_interface([api.parser.extends], [api.parser.implements])dnl
+b4_percent_define_get([api.parser.implements])])
+
+
+# b4_lexer_if(TRUE, FALSE)
+# ------------------------
+m4_define([b4_lexer_if],
+[b4_percent_code_ifdef([[lexer]], [$1], [$2])])
+
+
+# b4_position_type_if(TRUE, FALSE)
+# --------------------------------
+m4_define([b4_position_type_if],
+[b4_percent_define_ifdef([[position_type]], [$1], [$2])])
+
+
+# b4_location_type_if(TRUE, FALSE)
+# --------------------------------
+m4_define([b4_location_type_if],
+[b4_percent_define_ifdef([[location_type]], [$1], [$2])])
+
+
+# b4_identification
+# -----------------
+m4_define([b4_identification],
+[[/** Version number for the Bison executable that generated this parser.  */
+  public static immutable string yy_bison_version = "]b4_version_string[";
+
+  /** Name of the skeleton that generated this parser.  */
+  public static immutable string yy_bison_skeleton = ]b4_skeleton[;
+]])
+
+
+## ------------ ##
+## Data types.  ##
+## ------------ ##
+
+# b4_int_type(MIN, MAX)
+# ---------------------
+# Return the smallest int type able to handle numbers ranging from
+# MIN to MAX (included).
+m4_define([b4_int_type],
+[m4_if(b4_ints_in($@,   [-128],   [127]), [1], [byte],
+       b4_ints_in($@, [-32768], [32767]), [1], [short],
+                                               [int])])
+
+# b4_int_type_for(NAME)
+# ---------------------
+# Return the smallest int type able to handle numbers ranging from
+# `NAME_min' to `NAME_max' (included).
+m4_define([b4_int_type_for],
+[b4_int_type($1_min, $1_max)])
+
+# b4_null
+# -------
+m4_define([b4_null], [null])
+
+
+# b4_integral_parser_table_define(NAME, DATA, COMMENT)
+#-----------------------------------------------------
+# Define "yy<TABLE-NAME>" whose contents is CONTENT.
+m4_define([b4_integral_parser_table_define],
+[m4_ifvaln([$3], [b4_comment([$3], [  ])])dnl
+private static immutable b4_int_type_for([$2])[[]] yy$1_ =
+@{
+  $2
+@};dnl
+])
+
+
+## ------------- ##
+## Token kinds.  ##
+## ------------- ##
+
+m4_define([b4_symbol(-2, id)],  [[YYEMPTY]])
+b4_percent_define_default([[api.token.raw]], [[true]])
+
+# b4_token_enum(TOKEN-NAME, TOKEN-NUMBER)
+# ---------------------------------------
+# Output the definition of this token as an enum.
+m4_define([b4_token_enum],
+[b4_token_format([  %s = %s,
+], [$1])])
+
+# b4_token_enums
+# --------------
+# Output the definition of the tokens as enums.
+m4_define([b4_token_enums],
+[/* Token kinds.  */
+public enum TokenKind {
+  ]b4_symbol(empty, id)[ = -2,
+b4_symbol_foreach([b4_token_enum])dnl
+}
+])
+
+# b4_symbol_translate(STRING)
+# ---------------------------
+# Used by "bison" in the array of symbol names to mark those that
+# require translation.
+m4_define([b4_symbol_translate],
+[[_($1)]])
+
+
+# _b4_token_constructor_define(SYMBOL-NUM)
+# ----------------------------------------
+# Define Symbol.FOO for SYMBOL-NUM.
+m4_define([_b4_token_constructor_define],
+[b4_token_visible_if([$1],
+[[
+    static auto ]b4_symbol([$1], [id])[(]b4_symbol_if([$1], [has_type],
+[b4_union_if([b4_symbol([$1], [type]],
+[[typeof(YYSemanticType.]b4_symbol([$1], [type])[]])) [val]])dnl
+[]b4_locations_if([b4_symbol_if([$1], [has_type], [[, ]])[Location l]])[)
+    {
+      return Symbol(TokenKind.]b4_symbol([$1], [id])[]b4_symbol_if([$1], [has_type],
+      [[, val]])[]b4_locations_if([[, l]])[);
+    }]])])
+
+# b4_token_constructor_define
+# ---------------------------
+# Define Symbol.FOO for each token kind FOO.
+m4_define([b4_token_constructor_define],
+[[
+    /* Implementation of token constructors for each symbol type visible to
+     * the user. The code generates static methods that have the same names
+     * as the TokenKinds.
+     */]b4_symbol_foreach([_b4_token_constructor_define])dnl
+])
+
+## -------------- ##
+## Symbol kinds.  ##
+## -------------- ##
+
+# b4_symbol_kind(NUM)
+# -------------------
+m4_define([b4_symbol_kind],
+[SymbolKind.b4_symbol_kind_base($@)])
+
+
+# b4_symbol_enum(SYMBOL-NUM)
+# --------------------------
+# Output the definition of this symbol as an enum.
+m4_define([b4_symbol_enum],
+[m4_format([    %-30s %s],
+           m4_format([[%s = %s,]],
+                     b4_symbol([$1], [kind_base]),
+                     [$1]),
+           [b4_symbol_tag_comment([$1])])])
+
+
+# b4_declare_symbol_enum
+# ----------------------
+# The definition of the symbol internal numbers as an enum.
+# Defining YYEMPTY here is important: it forces the compiler
+# to use a signed type, which matters for yytoken.
+m4_define([b4_declare_symbol_enum],
+[[  /* Symbol kinds.  */
+  struct SymbolKind
+  {
+    enum
+    {
+    ]b4_symbol(empty, kind_base)[ = -2,  /* No symbol.  */
+]b4_symbol_foreach([b4_symbol_enum])dnl
+[    }
+
+    private int yycode_;
+    alias yycode_ this;
+
+    this(int code)
+    {
+      yycode_ = code;
+    }
+
+    /* Return YYSTR after stripping away unnecessary quotes and
+     backslashes, so that it's suitable for yyerror.  The heuristic is
+     that double-quoting is unnecessary unless the string contains an
+     apostrophe, a comma, or backslash (other than backslash-backslash).
+     YYSTR is taken from yytname.  */
+    final void toString(W)(W sink) const
+    if (isOutputRange!(W, char))
+    {
+      immutable string[] yy_sname = @{
+  ]b4_symbol_names[
+      @};]b4_has_translations_if([[
+      /* YYTRANSLATABLE[SYMBOL-NUM] -- Whether YY_SNAME[SYMBOL-NUM] is
+        internationalizable.  */
+      immutable ]b4_int_type_for([b4_translatable])[[] yytranslatable = @{
+  ]b4_translatable[
+      @};]])[
+
+      put(sink, yy_sname[yycode_]);
+    }
+  }
+]])
+
+
+# b4_case(ID, CODE, [COMMENTS])
+# -----------------------------
+m4_define([b4_case], [    case $1:m4_ifval([$3], [ b4_comment([$3])])
+$2
+      break;])
+
+
+## ---------------- ##
+## Default values.  ##
+## ---------------- ##
+
+m4_define([b4_yystype], [b4_percent_define_get([[stype]])])
+b4_percent_define_default([[stype]], [[YYSemanticType]])])
+
+# %name-prefix
+m4_define_default([b4_prefix], [[YY]])
+
+b4_percent_define_default([[api.parser.class]], [b4_prefix[]Parser])])
+m4_define([b4_parser_class], [b4_percent_define_get([[api.parser.class]])])
+
+#b4_percent_define_default([[location_type]], [Location])])
+m4_define([b4_location_type], b4_percent_define_ifdef([[location_type]],[b4_percent_define_get([[location_type]])],[YYLocation]))
+
+#b4_percent_define_default([[position_type]], [Position])])
+m4_define([b4_position_type], b4_percent_define_ifdef([[position_type]],[b4_percent_define_get([[position_type]])],[YYPosition]))
+
+
+## ---------------- ##
+## api.value.type.  ##
+## ---------------- ##
+
+
+# ---------------------- #
+# api.value.type=union.  #
+# ---------------------- #
+
+# b4_symbol_type_register(SYMBOL-NUM)
+# -----------------------------------
+# Symbol SYMBOL-NUM has a type (for union) instead of a type-tag.
+# Extend the definition of %union's body (b4_union_members) with a
+# field of that type, and extend the symbol's "type" field to point to
+# the field name, instead of the type name.
+m4_define([b4_symbol_type_register],
+[m4_define([b4_symbol($1, type_tag)],
+           [b4_symbol_if([$1], [has_id],
+                         [b4_symbol([$1], [id])],
+                         [yykind_[]b4_symbol([$1], [number])])])dnl
+m4_append([b4_union_members],
+m4_expand([m4_format([  %-40s %s],
+                     m4_expand([b4_symbol([$1], [type]) b4_symbol([$1], [type_tag]);]),
+                     [b4_symbol_tag_comment([$1])])]))
+])
+
+
+# b4_type_define_tag(SYMBOL1-NUM, ...)
+# ------------------------------------
+# For the batch of symbols SYMBOL1-NUM... (which all have the same
+# type), enhance the %union definition for each of them, and set
+# there "type" field to the field tag name, instead of the type name.
+m4_define([b4_type_define_tag],
+[b4_symbol_if([$1], [has_type],
+              [m4_map([b4_symbol_type_register], [$@])])
+])
+
+
+# b4_symbol_value_union(VAL, SYMBOL-NUM, [TYPE])
+# ----------------------------------------------
+# Same of b4_symbol_value, but when api.value.type=union.
+m4_define([b4_symbol_value_union],
+[m4_ifval([$3],
+          [(*($3*)(&$1))],
+          [m4_ifval([$2],
+                    [b4_symbol_if([$2], [has_type],
+                                  [($1.b4_symbol([$2], [type_tag]))],
+                                  [$1])],
+                    [$1])])])
+
+
+# b4_value_type_setup_union
+# -------------------------
+# Setup support for api.value.type=union.  Symbols are defined with a
+# type instead of a union member name: build the corresponding union,
+# and give the symbols their tag.
+m4_define([b4_value_type_setup_union],
+[m4_define([b4_union_members])
+b4_type_foreach([b4_type_define_tag])
+m4_copy_force([b4_symbol_value_union], [b4_symbol_value])
+])
+
+
+# _b4_value_type_setup_keyword
+# ----------------------------
+# api.value.type is defined with a keyword/string syntax.  Check if
+# that is properly defined, and prepare its use.
+m4_define([_b4_value_type_setup_keyword],
+[b4_percent_define_check_values([[[[api.value.type]],
+                                  [[none]],
+                                  [[union]],
+                                  [[union-directive]],
+                                  [[yystype]]]])dnl
+m4_case(b4_percent_define_get([[api.value.type]]),
+        [union],   [b4_value_type_setup_union])])
+
+
+# b4_value_type_setup
+# -------------------
+# Check if api.value.type is properly defined, and possibly prepare
+# its use.
+b4_define_silent([b4_value_type_setup],
+[
+# Define default value.
+b4_percent_define_ifdef([[api.value.type]], [],
+[# %union => api.value.type=union-directive
+m4_ifdef([b4_union_members],
+[m4_define([b4_percent_define_kind(api.value.type)], [keyword])
+m4_define([b4_percent_define(api.value.type)], [union-directive])],
+[# no tag seen => api.value.type={int}
+m4_if(b4_tag_seen_flag, 0,
+[m4_define([b4_percent_define_kind(api.value.type)], [code])
+m4_define([b4_percent_define(api.value.type)], [int])],
+[# otherwise api.value.type=yystype
+m4_define([b4_percent_define_kind(api.value.type)], [keyword])
+m4_define([b4_percent_define(api.value.type)], [yystype])])])])
+
+# Set up.
+m4_bmatch(b4_percent_define_get_kind([[api.value.type]]),
+   [keyword], [_b4_value_type_setup_keyword])
+])
+
+
+## ----------------- ##
+## Semantic Values.  ##
+## ----------------- ##
+
+
+# b4_symbol_value(VAL, [SYMBOL-NUM], [TYPE-TAG])
+# ----------------------------------------------
+# See README.  FIXME: factor in c-like?
+m4_define([b4_symbol_value],
+[m4_ifval([$3],
+          [($1.$3)],
+          [m4_ifval([$2],
+                    [b4_symbol_if([$2], [has_type],
+                                  [($1.b4_symbol([$2], [type]))],
+                                  [$1])],
+                    [$1])])])
+
+# b4_lhs_value(SYMBOL-NUM, [TYPE])
+# --------------------------------
+# See README.
+m4_define([b4_lhs_value],
+[b4_symbol_value([yyval], [$1], [$2])])
+
+
+# b4_rhs_value(RULE-LENGTH, POS, SYMBOL-NUM, [TYPE])
+# --------------------------------------------------
+# See README.
+#
+# In this simple implementation, %token and %type have class names
+# between the angle brackets.
+m4_define([b4_rhs_value],
+[b4_symbol_value([(yystack.valueAt (b4_subtract([$1], [$2])))], [$3], [$4])])
+
+
+# b4_lhs_location()
+# -----------------
+# Expansion of @$.
+m4_define([b4_lhs_location],
+[(yyloc)])
+
+
+# b4_rhs_location(RULE-LENGTH, POS)
+# ---------------------------------
+# Expansion of @POS, where the current rule has RULE-LENGTH symbols
+# on RHS.
+m4_define([b4_rhs_location],
+[yystack.locationAt (b4_subtract($@))])
+
+
+# b4_lex_param
+# b4_parse_param
+# --------------
+# If defined, b4_lex_param arrives double quoted, but below we prefer
+# it to be single quoted.  Same for b4_parse_param.
+
+# TODO: should be in bison.m4
+m4_define_default([b4_lex_param], [[]]))
+m4_define([b4_lex_param], b4_lex_param))
+m4_define([b4_parse_param], b4_parse_param))
+
+# b4_lex_param_decl
+# -------------------
+# Extra formal arguments of the constructor.
+m4_define([b4_lex_param_decl],
+[m4_ifset([b4_lex_param],
+          [b4_remove_comma([$1],
+                           b4_param_decls(b4_lex_param))],
+          [$1])])
+
+m4_define([b4_param_decls],
+          [m4_map([b4_param_decl], [$@])])
+m4_define([b4_param_decl], [, $1])
+
+m4_define([b4_remove_comma], [m4_ifval(m4_quote($1), [$1, ], [])m4_shift2($@)])
+
+
+
+# b4_parse_param_decl
+# -------------------
+# Extra formal arguments of the constructor.
+m4_define([b4_parse_param_decl],
+[m4_ifset([b4_parse_param],
+          [b4_remove_comma([$1],
+                           b4_param_decls(b4_parse_param))],
+          [$1])])
+
+
+
+# b4_lex_param_call
+# -------------------
+# Delegating the lexer parameters to the lexer constructor.
+m4_define([b4_lex_param_call],
+          [m4_ifset([b4_lex_param],
+                    [b4_remove_comma([$1],
+                                     b4_param_calls(b4_lex_param))],
+                    [$1])])
+m4_define([b4_param_calls],
+          [m4_map([b4_param_call], [$@])])
+m4_define([b4_param_call], [, $2])
+
+
+
+# b4_parse_param_cons
+# -------------------
+# Extra initialisations of the constructor.
+m4_define([b4_parse_param_cons],
+          [m4_ifset([b4_parse_param],
+                    [b4_constructor_calls(b4_parse_param)])])
+
+m4_define([b4_constructor_calls],
+          [m4_map([b4_constructor_call], [$@])])
+m4_define([b4_constructor_call],
+          [this.$2 = $2;
+          ])
+
+
+
+# b4_parse_param_vars
+# -------------------
+# Extra instance variables.
+m4_define([b4_parse_param_vars],
+          [m4_ifset([b4_parse_param],
+                    [
+    /* User arguments.  */
+b4_var_decls(b4_parse_param)])])
+
+m4_define([b4_var_decls],
+          [m4_map_sep([b4_var_decl], [
+], [$@])])
+m4_define([b4_var_decl],
+          [    protected $1;])
+
+
+# b4_public_types_declare
+# -----------------------
+# Define the public types: token, semantic value, location, and so forth.
+# Depending on %define token_lex, may be output in the header or source file.
+m4_define([b4_public_types_declare],
+[[
+alias Symbol = ]b4_parser_class[.Symbol;
+alias Value = ]b4_yystype[;]b4_locations_if([[
+alias Location = ]b4_location_type[;
+alias Position = ]b4_position_type[;]b4_push_if([[
+alias PUSH_MORE = ]b4_parser_class[.YYPUSH_MORE;
+alias ABORT = ]b4_parser_class[.YYABORT;
+alias ACCEPT = ]b4_parser_class[.YYACCEPT;]])[]])[
+]])
+
+
+# b4_basic_symbol_constructor_define
+# ----------------------------------
+# Create Symbol struct constructors for all the visible types.
+m4_define([b4_basic_symbol_constructor_define],
+[b4_token_visible_if([$1],
+[[    this(TokenKind token]b4_symbol_if([$1], [has_type],
+[[, ]b4_union_if([], [[typeof(YYSemanticType.]])b4_symbol([$1], [type])dnl
+[]b4_union_if([], [[) ]])[ val]])[]b4_locations_if([[, Location loc]])[)
+    {
+      kind = yytranslate_(token);]b4_union_if([b4_symbol_if([$1], [has_type], [[
+      static foreach (member; __traits(allMembers, YYSemanticType))
+      {
+        static if (is(typeof(mixin("value_." ~ member)) == ]b4_symbol([$1], [type])[))
+        {
+          mixin("value_." ~ member ~ " = val;");
+        }
+      }]])], [b4_symbol_if([$1], [has_type], [[
+      value_.]b4_symbol([$1], [type])[ = val;]])])[]b4_locations_if([
+      location_ = loc;])[
+    }
+]])])
+
+
+# b4_symbol_type_define
+# ---------------------
+# Define symbol_type, the external type for symbols used for symbol
+# constructors.
+m4_define([b4_symbol_type_define],
+[[
+  /**
+    * A complete symbol
+    */
+  struct Symbol
+  {
+    private SymbolKind kind;
+    private Value value_;]b4_locations_if([[
+    private Location location_;]])[
+
+]b4_type_foreach([b4_basic_symbol_constructor_define])[
+    SymbolKind token() { return kind; }
+    Value value() { return value_; }]b4_locations_if([[
+    Location location() { return location_; }]])[
+]b4_token_ctor_if([b4_token_constructor_define])[
+  }
+]])

Engine/bin/bison-flex/data/skeletons/glr.cc

@@ -0,0 +1,397 @@
+# C++ GLR skeleton for Bison
+
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+
+# This skeleton produces a C++ class that encapsulates a C glr parser.
+# This is in order to reduce the maintenance burden.  The glr.c
+# skeleton is clean and pure enough so that there are no real
+# problems.  The C++ interface is the same as that of lalr1.cc.  In
+# fact, glr.c can replace yacc.c without the user noticing any
+# difference, and similarly for glr.cc replacing lalr1.cc.
+#
+# The passing of parse-params
+#
+#   The additional arguments are stored as members of the parser
+#   object, yyparser.  The C routines need to carry yyparser
+#   throughout the C parser; that's easy: make yyparser an
+#   additional parse-param.  But because the C++ skeleton needs to
+#   know the "real" original parse-param, we save them
+#   (b4_parse_param_orig).  Note that b4_parse_param is overquoted
+#   (and c.m4 strips one level of quotes).  This is a PITA, and
+#   explains why there are so many levels of quotes.
+#
+# The locations
+#
+#   We use location.cc just like lalr1.cc, but because glr.c stores
+#   the locations in a union, the position and location classes
+#   must not have a constructor.  Therefore, contrary to lalr1.cc, we
+#   must not define "b4_location_constructors".  As a consequence the
+#   user must initialize the first positions (in particular the
+#   filename member).
+
+# We require a pure interface.
+m4_define([b4_pure_flag], [1])
+
+m4_include(b4_skeletonsdir/[c++.m4])
+b4_bison_locations_if([m4_include(b4_skeletonsdir/[location.cc])])
+
+m4_define([b4_parser_class],
+          [b4_percent_define_get([[api.parser.class]])])
+
+# Save the parse parameters.
+m4_define([b4_parse_param_orig], m4_defn([b4_parse_param]))
+
+# b4_parse_param_wrap
+# -------------------
+# New ones.
+m4_ifset([b4_parse_param],
+[m4_define([b4_parse_param_wrap],
+           [[b4_namespace_ref::b4_parser_class[& yyparser], [[yyparser]]],]
+m4_defn([b4_parse_param]))],
+[m4_define([b4_parse_param_wrap],
+           [[b4_namespace_ref::b4_parser_class[& yyparser], [[yyparser]]]])
+])
+
+
+# b4_yy_symbol_print_define
+# -------------------------
+# Bypass the default implementation to generate the "yy_symbol_print"
+# and "yy_symbol_value_print" functions.
+m4_define([b4_yy_symbol_print_define],
+[[/*--------------------.
+| Print this symbol.  |
+`--------------------*/
+
+static void
+yy_symbol_print (FILE *, ]b4_namespace_ref::b4_parser_class[::symbol_kind_type yytoken,
+                 const ]b4_namespace_ref::b4_parser_class[::value_type *yyvaluep]b4_locations_if([[,
+                 const ]b4_namespace_ref::b4_parser_class[::location_type *yylocationp]])[]b4_user_formals[)
+{
+]b4_parse_param_use[]dnl
+[  yyparser.yy_symbol_print_ (yytoken, yyvaluep]b4_locations_if([, yylocationp])[);
+}
+]])[
+
+# Hijack the initial action to initialize the locations.
+]b4_bison_locations_if([m4_define([b4_initial_action],
+[yylloc.initialize ();]m4_ifdef([b4_initial_action], [
+m4_defn([b4_initial_action])]))])[
+
+# Hijack the post prologue to declare yyerror.
+]m4_append([b4_post_prologue],
+[b4_syncline([@oline@], [@ofile@])dnl
+[static void
+yyerror (]b4_locations_if([[const ]b4_namespace_ref::b4_parser_class[::location_type *yylocationp,
+         ]])[]m4_ifset([b4_parse_param], [b4_formals(b4_parse_param),
+         ])[const char* msg);]])[
+
+# Inserted before the epilogue to define implementations (yyerror, parser member
+# functions etc.).
+]m4_define([b4_glr_cc_pre_epilogue],
+[b4_syncline([@oline@], [@ofile@])dnl
+[
+/*------------------.
+| Report an error.  |
+`------------------*/
+
+static void
+yyerror (]b4_locations_if([[const ]b4_namespace_ref::b4_parser_class[::location_type *yylocationp,
+         ]])[]m4_ifset([b4_parse_param], [b4_formals(b4_parse_param),
+         ])[const char* msg)
+{
+]b4_parse_param_use[]dnl
+[  yyparser.error (]b4_locations_if([[*yylocationp, ]])[msg);
+}
+
+
+]b4_namespace_open[
+]dnl In this section, the parse params are the original parse_params.
+m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
+[  /// Build a parser object.
+  ]b4_parser_class::b4_parser_class[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
+    :])[
+#if ]b4_api_PREFIX[DEBUG
+    ]m4_ifset([b4_parse_param], [  ], [ :])[yycdebug_ (&std::cerr)]m4_ifset([b4_parse_param], [,])[
+#endif]b4_parse_param_cons[
+  {}
+
+  ]b4_parser_class::~b4_parser_class[ ()
+  {}
+
+  ]b4_parser_class[::syntax_error::~syntax_error () YY_NOEXCEPT YY_NOTHROW
+  {}
+
+  int
+  ]b4_parser_class[::operator() ()
+  {
+    return parse ();
+  }
+
+  int
+  ]b4_parser_class[::parse ()
+  {
+    return ::yy_parse_impl (*this]b4_user_args[);
+  }
+
+#if ]b4_api_PREFIX[DEBUG
+  /*--------------------.
+  | Print this symbol.  |
+  `--------------------*/
+
+  void
+  ]b4_parser_class[::yy_symbol_value_print_ (symbol_kind_type yykind,
+                           const value_type* yyvaluep]b4_locations_if([[,
+                           const location_type* yylocationp]])[) const
+  {]b4_locations_if([[
+    YY_USE (yylocationp);]])[
+    YY_USE (yyvaluep);
+    std::ostream& yyo = debug_stream ();
+    std::ostream& yyoutput = yyo;
+    YY_USE (yyoutput);
+    ]b4_symbol_actions([printer])[
+  }
+
+
+  void
+  ]b4_parser_class[::yy_symbol_print_ (symbol_kind_type yykind,
+                           const value_type* yyvaluep]b4_locations_if([[,
+                           const location_type* yylocationp]])[) const
+  {
+    *yycdebug_ << (yykind < YYNTOKENS ? "token" : "nterm")
+               << ' ' << yysymbol_name (yykind) << " ("]b4_locations_if([[
+               << *yylocationp << ": "]])[;
+    yy_symbol_value_print_ (yykind, yyvaluep]b4_locations_if([[, yylocationp]])[);
+    *yycdebug_ << ')';
+  }
+
+  std::ostream&
+  ]b4_parser_class[::debug_stream () const
+  {
+    return *yycdebug_;
+  }
+
+  void
+  ]b4_parser_class[::set_debug_stream (std::ostream& o)
+  {
+    yycdebug_ = &o;
+  }
+
+
+  ]b4_parser_class[::debug_level_type
+  ]b4_parser_class[::debug_level () const
+  {
+    return yydebug;
+  }
+
+  void
+  ]b4_parser_class[::set_debug_level (debug_level_type l)
+  {
+    // Actually, it is yydebug which is really used.
+    yydebug = l;
+  }
+
+#endif
+]m4_popdef([b4_parse_param])dnl
+b4_namespace_close[]dnl
+])
+
+
+m4_define([b4_define_symbol_kind],
+[m4_format([#define %-15s %s],
+           b4_symbol($][1, kind_base),
+           b4_namespace_ref[::]b4_parser_class[::symbol_kind::]b4_symbol($1, kind_base))
+])
+
+# b4_glr_cc_setup
+# ---------------
+# Setup redirections for glr.c: Map the names used in c.m4 to the ones used
+# in c++.m4.
+m4_define([b4_glr_cc_setup],
+[[]b4_attribute_define[
+]b4_null_define[
+
+// This skeleton is based on C, yet compiles it as C++.
+// So expect warnings about C style casts.
+#if defined __clang__ && 306 <= __clang_major__ * 100 + __clang_minor__
+# pragma clang diagnostic ignored "-Wold-style-cast"
+#elif defined __GNUC__ && 406 <= __GNUC__ * 100 + __GNUC_MINOR__
+# pragma GCC diagnostic ignored "-Wold-style-cast"
+#endif
+
+// On MacOS, PTRDIFF_MAX is defined as long long, which Clang's
+// -pedantic reports as being a C++11 extension.
+#if defined __APPLE__ && YY_CPLUSPLUS < 201103L \
+    && defined __clang__ && 4 <= __clang_major__
+# pragma clang diagnostic ignored "-Wc++11-long-long"
+#endif
+
+#undef ]b4_symbol(empty, [id])[
+#define ]b4_symbol(empty, [id])[ ]b4_namespace_ref[::]b4_parser_class[::token::]b4_symbol(empty, [id])[
+#undef ]b4_symbol(eof, [id])[
+#define ]b4_symbol(eof, [id])[ ]b4_namespace_ref[::]b4_parser_class[::token::]b4_symbol(eof, [id])[
+#undef ]b4_symbol(error, [id])[
+#define ]b4_symbol(error, [id])[ ]b4_namespace_ref[::]b4_parser_class[::token::]b4_symbol(error, [id])[
+
+#ifndef ]b4_api_PREFIX[STYPE
+# define ]b4_api_PREFIX[STYPE ]b4_namespace_ref[::]b4_parser_class[::value_type
+#endif
+#ifndef ]b4_api_PREFIX[LTYPE
+# define ]b4_api_PREFIX[LTYPE ]b4_namespace_ref[::]b4_parser_class[::location_type
+#endif
+
+typedef ]b4_namespace_ref[::]b4_parser_class[::symbol_kind_type yysymbol_kind_t;
+
+// Expose C++ symbol kinds to C.
+]b4_define_symbol_kind(-2)dnl
+b4_symbol_foreach([b4_define_symbol_kind])])[
+]])
+
+
+m4_define([b4_undef_symbol_kind],
+[[#undef ]b4_symbol($1, kind_base)[
+]])
+
+
+# b4_glr_cc_cleanup
+# -----------------
+# Remove redirections for glr.c.
+m4_define([b4_glr_cc_cleanup],
+[[#undef ]b4_symbol(empty, [id])[
+#undef ]b4_symbol(eof, [id])[
+#undef ]b4_symbol(error, [id])[
+
+]b4_undef_symbol_kind(-2)dnl
+b4_symbol_foreach([b4_undef_symbol_kind])dnl
+])
+
+
+# b4_shared_declarations(hh|cc)
+# -----------------------------
+# Declaration that might either go into the header (if --header, $1 = hh)
+# or in the implementation file.
+m4_define([b4_shared_declarations],
+[m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_orig]))dnl
+b4_percent_code_get([[requires]])[
+#include <iostream>
+#include <stdexcept>
+#include <string>
+
+]b4_cxx_portability[
+]m4_ifdef([b4_location_include],
+          [[# include ]b4_location_include])[
+]b4_variant_if([b4_variant_includes])[
+
+// Whether we are compiled with exception support.
+#ifndef YY_EXCEPTIONS
+# if defined __GNUC__ && !defined __EXCEPTIONS
+#  define YY_EXCEPTIONS 0
+# else
+#  define YY_EXCEPTIONS 1
+# endif
+#endif
+
+]b4_YYDEBUG_define[
+
+]b4_namespace_open[
+
+]b4_bison_locations_if([m4_ifndef([b4_location_file],
+                                  [b4_location_define])])[
+
+  /// A Bison parser.
+  class ]b4_parser_class[
+  {
+  public:
+]b4_public_types_declare[
+
+    /// Build a parser object.
+    ]b4_parser_class[ (]b4_parse_param_decl[);
+    virtual ~]b4_parser_class[ ();
+
+    /// Parse.  An alias for parse ().
+    /// \returns  0 iff parsing succeeded.
+    int operator() ();
+
+    /// Parse.
+    /// \returns  0 iff parsing succeeded.
+    virtual int parse ();
+
+#if ]b4_api_PREFIX[DEBUG
+    /// The current debugging stream.
+    std::ostream& debug_stream () const;
+    /// Set the current debugging stream.
+    void set_debug_stream (std::ostream &);
+
+    /// Type for debugging levels.
+    typedef int debug_level_type;
+    /// The current debugging level.
+    debug_level_type debug_level () const;
+    /// Set the current debugging level.
+    void set_debug_level (debug_level_type l);
+#endif
+
+    /// Report a syntax error.]b4_locations_if([[
+    /// \param loc    where the syntax error is found.]])[
+    /// \param msg    a description of the syntax error.
+    virtual void error (]b4_locations_if([[const location_type& loc, ]])[const std::string& msg);
+
+# if ]b4_api_PREFIX[DEBUG
+  public:
+    /// \brief Report a symbol value on the debug stream.
+    /// \param yykind       The symbol kind.
+    /// \param yyvaluep     Its semantic value.]b4_locations_if([[
+    /// \param yylocationp  Its location.]])[
+    virtual void yy_symbol_value_print_ (symbol_kind_type yykind,
+                                         const value_type* yyvaluep]b4_locations_if([[,
+                                         const location_type* yylocationp]])[) const;
+    /// \brief Report a symbol on the debug stream.
+    /// \param yykind       The symbol kind.
+    /// \param yyvaluep     Its semantic value.]b4_locations_if([[
+    /// \param yylocationp  Its location.]])[
+    virtual void yy_symbol_print_ (symbol_kind_type yykind,
+                                   const value_type* yyvaluep]b4_locations_if([[,
+                                   const location_type* yylocationp]])[) const;
+  private:
+    /// Debug stream.
+    std::ostream* yycdebug_;
+#endif
+
+]b4_parse_param_vars[
+  };
+
+]b4_namespace_close[
+
+]b4_percent_code_get([[provides]])[
+]m4_popdef([b4_parse_param])dnl
+])[
+
+]b4_header_if(
+[b4_output_begin([b4_spec_header_file])
+b4_copyright([Skeleton interface for Bison GLR parsers in C++],
+             [2002-2015, 2018-2021])[
+// C++ GLR parser skeleton written by Akim Demaille.
+
+]b4_disclaimer[
+]b4_cpp_guard_open([b4_spec_mapped_header_file])[
+]b4_shared_declarations[
+]b4_cpp_guard_close([b4_spec_mapped_header_file])[
+]b4_output_end])
+
+# Let glr.c (and b4_shared_declarations) believe that the user
+# arguments include the parser itself.
+m4_pushdef([b4_parse_param], m4_defn([b4_parse_param_wrap]))
+m4_include(b4_skeletonsdir/[glr.c])
+m4_popdef([b4_parse_param])

Engine/bin/bison-flex/data/skeletons/java-skel.m4

@@ -0,0 +1,27 @@
+                                                            -*- Autoconf -*-
+
+# Java skeleton dispatching for Bison.
+
+# Copyright (C) 2007, 2009-2015, 2018-2021 Free Software Foundation,
+# Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+b4_glr_if(             [b4_complain([%%glr-parser not supported for Java])])
+b4_nondeterministic_if([b4_complain([%%nondeterministic-parser not supported for Java])])
+
+m4_define_default([b4_used_skeleton], [b4_skeletonsdir/[lalr1.java]])
+m4_define_default([b4_skeleton], ["b4_basename(b4_used_skeleton)"])
+
+m4_include(b4_used_skeleton)

Engine/bin/bison-flex/data/skeletons/java.m4

@@ -0,0 +1,502 @@
+                                                            -*- Autoconf -*-
+
+# Java language support for Bison
+
+# Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+m4_include(b4_skeletonsdir/[c-like.m4])
+
+
+# b4_list2(LIST1, LIST2)
+# ----------------------
+# Join two lists with a comma if necessary.
+m4_define([b4_list2],
+          [$1[]m4_ifval(m4_quote($1), [m4_ifval(m4_quote($2), [[, ]])])[]$2])
+
+
+# b4_percent_define_get3(DEF, PRE, POST, NOT)
+# -------------------------------------------
+# Expand to the value of DEF surrounded by PRE and POST if it's %define'ed,
+# otherwise NOT.
+m4_define([b4_percent_define_get3],
+          [m4_ifval(m4_quote(b4_percent_define_get([$1])),
+                [$2[]b4_percent_define_get([$1])[]$3], [$4])])
+
+
+
+# b4_flag_value(BOOLEAN-FLAG)
+# ---------------------------
+m4_define([b4_flag_value], [b4_flag_if([$1], [true], [false])])
+
+
+# b4_parser_class_declaration
+# ---------------------------
+# The declaration of the parser class ("class YYParser"), with all its
+# qualifiers/annotations.
+b4_percent_define_default([[api.parser.abstract]], [[false]])
+b4_percent_define_default([[api.parser.final]],    [[false]])
+b4_percent_define_default([[api.parser.public]],   [[false]])
+b4_percent_define_default([[api.parser.strictfp]], [[false]])
+
+m4_define([b4_parser_class_declaration],
+[b4_percent_define_get3([api.parser.annotations], [], [ ])dnl
+b4_percent_define_flag_if([api.parser.public],   [public ])dnl
+b4_percent_define_flag_if([api.parser.abstract], [abstract ])dnl
+b4_percent_define_flag_if([api.parser.final],    [final ])dnl
+b4_percent_define_flag_if([api.parser.strictfp], [strictfp ])dnl
+[class ]b4_parser_class[]dnl
+b4_percent_define_get3([api.parser.extends], [ extends ])dnl
+b4_percent_define_get3([api.parser.implements], [ implements ])])
+
+
+# b4_lexer_if(TRUE, FALSE)
+# ------------------------
+m4_define([b4_lexer_if],
+[b4_percent_code_ifdef([[lexer]], [$1], [$2])])
+
+
+# b4_identification
+# -----------------
+m4_define([b4_identification],
+[[  /** Version number for the Bison executable that generated this parser.  */
+  public static final String bisonVersion = "]b4_version_string[";
+
+  /** Name of the skeleton that generated this parser.  */
+  public static final String bisonSkeleton = ]b4_skeleton[;
+]])
+
+
+## ------------ ##
+## Data types.  ##
+## ------------ ##
+
+# b4_int_type(MIN, MAX)
+# ---------------------
+# Return the smallest int type able to handle numbers ranging from
+# MIN to MAX (included).
+m4_define([b4_int_type],
+[m4_if(b4_ints_in($@,   [-128],   [127]), [1], [byte],
+       b4_ints_in($@, [-32768], [32767]), [1], [short],
+                                               [int])])
+
+# b4_int_type_for(NAME)
+# ---------------------
+# Return the smallest int type able to handle numbers ranging from
+# 'NAME_min' to 'NAME_max' (included).
+m4_define([b4_int_type_for],
+[b4_int_type($1_min, $1_max)])
+
+# b4_null
+# -------
+m4_define([b4_null], [null])
+
+
+# b4_typed_parser_table_define(TYPE, NAME, DATA, COMMENT)
+# -------------------------------------------------------
+# We use intermediate functions (e.g., yypact_init) to work around the
+# 64KB limit for JVM methods.  See
+# https://lists.gnu.org/r/help-bison/2008-11/msg00004.html.
+m4_define([b4_typed_parser_table_define],
+[m4_ifval([$4], [b4_comment([$4])
+  ])dnl
+[private static final ]$1[[] yy$2_ = yy$2_init();
+  private static final ]$1[[] yy$2_init()
+  {
+    return new ]$1[[]
+    {
+  ]$3[
+    };
+  }]])
+
+
+# b4_integral_parser_table_define(NAME, DATA, COMMENT)
+#-----------------------------------------------------
+m4_define([b4_integral_parser_table_define],
+[b4_typed_parser_table_define([b4_int_type_for([$2])], [$1], [$2], [$3])])
+
+
+## ------------- ##
+## Token kinds.  ##
+## ------------- ##
+
+
+# b4_token_enum(TOKEN-NUM)
+# ------------------------
+# Output the definition of this token as an enum.
+m4_define([b4_token_enum],
+[b4_token_visible_if([$1],
+    [m4_format([[    /** Token %s, to be returned by the scanner.  */
+    static final int %s = %s%s;
+]],
+               b4_symbol([$1], [tag]),
+               b4_symbol([$1], [id]),
+               b4_symbol([$1], b4_api_token_raw_if([[number]], [[code]])))])])
+
+
+# b4_token_enums
+# --------------
+# Output the definition of the tokens (if there are) as enums.
+m4_define([b4_token_enums],
+[b4_any_token_visible_if([    /* Token kinds.  */
+b4_symbol_foreach([b4_token_enum])])])
+
+
+
+## -------------- ##
+## Symbol kinds.  ##
+## -------------- ##
+
+
+# b4_symbol_kind(NUM)
+# -------------------
+m4_define([b4_symbol_kind],
+[SymbolKind.b4_symbol_kind_base($@)])
+
+
+# b4_symbol_enum(SYMBOL-NUM)
+# --------------------------
+# Output the definition of this symbol as an enum.
+m4_define([b4_symbol_enum],
+[m4_format([    %-30s %s],
+           m4_format([[%s(%s)%s]],
+                     b4_symbol([$1], [kind_base]),
+                     [$1],
+                     m4_if([$1], b4_last_symbol, [[;]], [[,]])),
+           [b4_symbol_tag_comment([$1])])])
+
+
+# b4_declare_symbol_enum
+# ----------------------
+# The definition of the symbol internal numbers as an enum.
+m4_define([b4_declare_symbol_enum],
+[[  public enum SymbolKind
+  {
+]b4_symbol_foreach([b4_symbol_enum])[
+
+    private final int yycode_;
+
+    SymbolKind (int n) {
+      this.yycode_ = n;
+    }
+
+    private static final SymbolKind[] values_ = {
+      ]m4_map_args_sep([b4_symbol_kind(], [)], [,
+      ], b4_symbol_numbers)[
+    };
+
+    static final SymbolKind get(int code) {
+      return values_[code];
+    }
+
+    public final int getCode() {
+      return this.yycode_;
+    }
+
+]b4_parse_error_bmatch(
+[simple\|verbose],
+[[    /* Return YYSTR after stripping away unnecessary quotes and
+       backslashes, so that it's suitable for yyerror.  The heuristic is
+       that double-quoting is unnecessary unless the string contains an
+       apostrophe, a comma, or backslash (other than backslash-backslash).
+       YYSTR is taken from yytname.  */
+    private static String yytnamerr_(String yystr)
+    {
+      if (yystr.charAt (0) == '"')
+        {
+          StringBuffer yyr = new StringBuffer();
+          strip_quotes: for (int i = 1; i < yystr.length(); i++)
+            switch (yystr.charAt(i))
+              {
+              case '\'':
+              case ',':
+                break strip_quotes;
+
+              case '\\':
+                if (yystr.charAt(++i) != '\\')
+                  break strip_quotes;
+                /* Fall through.  */
+              default:
+                yyr.append(yystr.charAt(i));
+                break;
+
+              case '"':
+                return yyr.toString();
+              }
+        }
+      return yystr;
+    }
+
+    /* YYTNAME[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
+       First, the terminals, then, starting at \a YYNTOKENS_, nonterminals.  */
+    ]b4_typed_parser_table_define([String], [tname], [b4_tname])[
+
+    /* The user-facing name of this symbol.  */
+    public final String getName() {
+      return yytnamerr_(yytname_[yycode_]);
+    }
+]],
+[custom\|detailed],
+[[    /* YYNAMES_[SYMBOL-NUM] -- String name of the symbol SYMBOL-NUM.
+       First, the terminals, then, starting at \a YYNTOKENS_, nonterminals.  */
+    ]b4_typed_parser_table_define([String], [names], [b4_symbol_names])[
+
+    /* The user-facing name of this symbol.  */
+    public final String getName() {
+      return yynames_[yycode_];
+    }]])[
+  };
+]])])
+
+
+
+# b4_case(ID, CODE, [COMMENTS])
+# -----------------------------
+# We need to fool Java's stupid unreachable code detection.
+m4_define([b4_case],
+[  case $1:m4_ifval([$3], [ b4_comment([$3])])
+  if (yyn == $1)
+    $2;
+  break;
+])
+
+
+# b4_predicate_case(LABEL, CONDITIONS)
+# ------------------------------------
+m4_define([b4_predicate_case],
+[  case $1:
+     if (! ($2)) YYERROR;
+    break;
+])
+
+
+## -------- ##
+## Checks.  ##
+## -------- ##
+
+b4_percent_define_check_kind([[api.value.type]],    [code], [deprecated])
+
+b4_percent_define_check_kind([[annotations]],       [code], [deprecated])
+b4_percent_define_check_kind([[extends]],           [code], [deprecated])
+b4_percent_define_check_kind([[implements]],        [code], [deprecated])
+b4_percent_define_check_kind([[init_throws]],       [code], [deprecated])
+b4_percent_define_check_kind([[lex_throws]],        [code], [deprecated])
+b4_percent_define_check_kind([[api.parser.class]],  [code], [deprecated])
+b4_percent_define_check_kind([[throws]],            [code], [deprecated])
+
+
+
+## ---------------- ##
+## Default values.  ##
+## ---------------- ##
+
+m4_define([b4_yystype], [b4_percent_define_get([[api.value.type]])])
+b4_percent_define_default([[api.value.type]], [[Object]])
+b4_percent_define_default([[api.symbol.prefix]], [[S_]])
+
+# b4_api_prefix, b4_api_PREFIX
+# ----------------------------
+# Corresponds to %define api.prefix
+b4_percent_define_default([[api.prefix]], [[YY]])
+m4_define([b4_api_prefix],
+[b4_percent_define_get([[api.prefix]])])
+m4_define([b4_api_PREFIX],
+[m4_toupper(b4_api_prefix)])
+
+# b4_prefix
+# ---------
+# If the %name-prefix is not given, it is api.prefix.
+m4_define_default([b4_prefix], [b4_api_prefix])
+
+b4_percent_define_default([[api.parser.class]], [b4_prefix[]Parser])
+m4_define([b4_parser_class], [b4_percent_define_get([[api.parser.class]])])
+
+b4_percent_define_default([[lex_throws]], [[java.io.IOException]])
+m4_define([b4_lex_throws], [b4_percent_define_get([[lex_throws]])])
+
+b4_percent_define_default([[throws]], [])
+m4_define([b4_throws], [b4_percent_define_get([[throws]])])
+
+b4_percent_define_default([[init_throws]], [])
+m4_define([b4_init_throws], [b4_percent_define_get([[init_throws]])])
+
+b4_percent_define_default([[api.location.type]], [Location])
+m4_define([b4_location_type], [b4_percent_define_get([[api.location.type]])])
+
+b4_percent_define_default([[api.position.type]], [Position])
+m4_define([b4_position_type], [b4_percent_define_get([[api.position.type]])])
+
+
+## ----------------- ##
+## Semantic Values.  ##
+## ----------------- ##
+
+
+# b4_symbol_translate(STRING)
+# ---------------------------
+# Used by "bison" in the array of symbol names to mark those that
+# require translation.
+m4_define([b4_symbol_translate],
+[[i18n($1)]])
+
+
+# b4_trans(STRING)
+# ----------------
+# Translate a string if i18n is enabled.  Avoid collision with b4_translate.
+m4_define([b4_trans],
+[b4_has_translations_if([i18n($1)], [$1])])
+
+
+
+# b4_symbol_value(VAL, [SYMBOL-NUM], [TYPE-TAG])
+# ----------------------------------------------
+# See README.
+m4_define([b4_symbol_value],
+[m4_ifval([$3],
+          [(($3)($1))],
+          [m4_ifval([$2],
+                    [b4_symbol_if([$2], [has_type],
+                                  [((b4_symbol([$2], [type]))($1))],
+                                  [$1])],
+                    [$1])])])
+
+
+# b4_lhs_value([SYMBOL-NUM], [TYPE])
+# ----------------------------------
+# See README.
+m4_define([b4_lhs_value], [yyval])
+
+
+# b4_rhs_data(RULE-LENGTH, POS)
+# -----------------------------
+# See README.
+m4_define([b4_rhs_data],
+[yystack.valueAt (b4_subtract($@))])
+
+# b4_rhs_value(RULE-LENGTH, POS, SYMBOL-NUM, [TYPE])
+# --------------------------------------------------
+# See README.
+#
+# In this simple implementation, %token and %type have class names
+# between the angle brackets.
+m4_define([b4_rhs_value],
+[b4_symbol_value([b4_rhs_data([$1], [$2])], [$3], [$4])])
+
+
+# b4_lhs_location()
+# -----------------
+# Expansion of @$.
+m4_define([b4_lhs_location],
+[(yyloc)])
+
+
+# b4_rhs_location(RULE-LENGTH, POS)
+# ---------------------------------
+# Expansion of @POS, where the current rule has RULE-LENGTH symbols
+# on RHS.
+m4_define([b4_rhs_location],
+[yystack.locationAt (b4_subtract($@))])
+
+
+# b4_lex_param
+# b4_parse_param
+# --------------
+# If defined, b4_lex_param arrives double quoted, but below we prefer
+# it to be single quoted.  Same for b4_parse_param.
+
+# TODO: should be in bison.m4
+m4_define_default([b4_lex_param], [[]])
+m4_define([b4_lex_param], b4_lex_param)
+m4_define([b4_parse_param], b4_parse_param)
+
+# b4_lex_param_decl
+# -----------------
+# Extra formal arguments of the constructor.
+m4_define([b4_lex_param_decl],
+[m4_ifset([b4_lex_param],
+          [b4_remove_comma([$1],
+                           b4_param_decls(b4_lex_param))],
+          [$1])])
+
+m4_define([b4_param_decls],
+          [m4_map([b4_param_decl], [$@])])
+m4_define([b4_param_decl], [, $1])
+
+m4_define([b4_remove_comma], [m4_ifval(m4_quote($1), [$1, ], [])m4_shift2($@)])
+
+
+
+# b4_parse_param_decl
+# -------------------
+# Extra formal arguments of the constructor.
+m4_define([b4_parse_param_decl],
+[m4_ifset([b4_parse_param],
+          [b4_remove_comma([$1],
+                           b4_param_decls(b4_parse_param))],
+          [$1])])
+
+
+
+# b4_lex_param_call
+# -----------------
+# Delegating the lexer parameters to the lexer constructor.
+m4_define([b4_lex_param_call],
+          [m4_ifset([b4_lex_param],
+                    [b4_remove_comma([$1],
+                                     b4_param_calls(b4_lex_param))],
+                    [$1])])
+m4_define([b4_param_calls],
+          [m4_map([b4_param_call], [$@])])
+m4_define([b4_param_call], [, $2])
+
+
+
+# b4_parse_param_cons
+# -------------------
+# Extra initialisations of the constructor.
+m4_define([b4_parse_param_cons],
+          [m4_ifset([b4_parse_param],
+                    [b4_constructor_calls(b4_parse_param)])])
+
+m4_define([b4_constructor_calls],
+          [m4_map([b4_constructor_call], [$@])])
+m4_define([b4_constructor_call],
+          [this.$2 = $2;
+          ])
+
+
+
+# b4_parse_param_vars
+# -------------------
+# Extra instance variables.
+m4_define([b4_parse_param_vars],
+          [m4_ifset([b4_parse_param],
+                    [
+    /* User arguments.  */
+b4_var_decls(b4_parse_param)])])
+
+m4_define([b4_var_decls],
+          [m4_map_sep([b4_var_decl], [
+], [$@])])
+m4_define([b4_var_decl],
+          [    protected final $1;])
+
+
+
+# b4_maybe_throws(THROWS)
+# -----------------------
+# Expand to either an empty string or "throws THROWS".
+m4_define([b4_maybe_throws],
+          [m4_ifval($1, [ throws $1])])

Engine/bin/bison-flex/data/skeletons/location.cc

@@ -0,0 +1,380 @@
+# C++ skeleton for Bison
+
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+m4_pushdef([b4_copyright_years],
+           [2002-2015, 2018-2021])
+
+
+# b4_location_file
+# ----------------
+# Name of the file containing the position/location class,
+# if we want this file.
+b4_percent_define_check_file([b4_location_file],
+                             [[api.location.file]],
+                             b4_header_if([[location.hh]]))
+
+# b4_location_include
+# -------------------
+# If location.hh is to be generated, the name under which should it be
+# included.
+#
+# b4_location_path
+# ----------------
+# The path to use for the CPP guard.
+m4_ifdef([b4_location_file],
+[m4_define([b4_location_include],
+           [b4_percent_define_get([[api.location.include]],
+                                  ["b4_location_file"])])
+ m4_define([b4_location_path],
+           b4_percent_define_get([[api.location.include]],
+                                 ["b4_mapped_dir_prefix[]b4_location_file"]))
+ m4_define([b4_location_path],
+           m4_substr(m4_defn([b4_location_path]), 1, m4_eval(m4_len(m4_defn([b4_location_path])) - 2)))
+ ])
+
+
+# b4_position_file
+# ----------------
+# Name of the file containing the position class, if we want this file.
+b4_header_if(
+  [b4_required_version_if(
+    [30200], [],
+    [m4_ifdef([b4_location_file],
+              [m4_define([b4_position_file], [position.hh])])])])
+
+
+
+# b4_location_define
+# ------------------
+# Define the position and location classes.
+m4_define([b4_location_define],
+[[  /// A point in a source file.
+  class position
+  {
+  public:
+    /// Type for file name.
+    typedef ]b4_percent_define_get([[api.filename.type]])[ filename_type;
+    /// Type for line and column numbers.
+    typedef int counter_type;
+]m4_ifdef([b4_location_constructors], [[
+    /// Construct a position.
+    explicit position (filename_type* f = YY_NULLPTR,
+                       counter_type l = ]b4_location_initial_line[,
+                       counter_type c = ]b4_location_initial_column[)
+      : filename (f)
+      , line (l)
+      , column (c)
+    {}
+
+]])[
+    /// Initialization.
+    void initialize (filename_type* fn = YY_NULLPTR,
+                     counter_type l = ]b4_location_initial_line[,
+                     counter_type c = ]b4_location_initial_column[)
+    {
+      filename = fn;
+      line = l;
+      column = c;
+    }
+
+    /** \name Line and Column related manipulators
+     ** \{ */
+    /// (line related) Advance to the COUNT next lines.
+    void lines (counter_type count = 1)
+    {
+      if (count)
+        {
+          column = ]b4_location_initial_column[;
+          line = add_ (line, count, ]b4_location_initial_line[);
+        }
+    }
+
+    /// (column related) Advance to the COUNT next columns.
+    void columns (counter_type count = 1)
+    {
+      column = add_ (column, count, ]b4_location_initial_column[);
+    }
+    /** \} */
+
+    /// File name to which this position refers.
+    filename_type* filename;
+    /// Current line number.
+    counter_type line;
+    /// Current column number.
+    counter_type column;
+
+  private:
+    /// Compute max (min, lhs+rhs).
+    static counter_type add_ (counter_type lhs, counter_type rhs, counter_type min)
+    {
+      return lhs + rhs < min ? min : lhs + rhs;
+    }
+  };
+
+  /// Add \a width columns, in place.
+  inline position&
+  operator+= (position& res, position::counter_type width)
+  {
+    res.columns (width);
+    return res;
+  }
+
+  /// Add \a width columns.
+  inline position
+  operator+ (position res, position::counter_type width)
+  {
+    return res += width;
+  }
+
+  /// Subtract \a width columns, in place.
+  inline position&
+  operator-= (position& res, position::counter_type width)
+  {
+    return res += -width;
+  }
+
+  /// Subtract \a width columns.
+  inline position
+  operator- (position res, position::counter_type width)
+  {
+    return res -= width;
+  }
+]b4_percent_define_flag_if([[define_location_comparison]], [[
+  /// Compare two position objects.
+  inline bool
+  operator== (const position& pos1, const position& pos2)
+  {
+    return (pos1.line == pos2.line
+            && pos1.column == pos2.column
+            && (pos1.filename == pos2.filename
+                || (pos1.filename && pos2.filename
+                    && *pos1.filename == *pos2.filename)));
+  }
+
+  /// Compare two position objects.
+  inline bool
+  operator!= (const position& pos1, const position& pos2)
+  {
+    return !(pos1 == pos2);
+  }
+]])[
+  /** \brief Intercept output stream redirection.
+   ** \param ostr the destination output stream
+   ** \param pos a reference to the position to redirect
+   */
+  template <typename YYChar>
+  std::basic_ostream<YYChar>&
+  operator<< (std::basic_ostream<YYChar>& ostr, const position& pos)
+  {
+    if (pos.filename)
+      ostr << *pos.filename << ':';
+    return ostr << pos.line << '.' << pos.column;
+  }
+
+  /// Two points in a source file.
+  class location
+  {
+  public:
+    /// Type for file name.
+    typedef position::filename_type filename_type;
+    /// Type for line and column numbers.
+    typedef position::counter_type counter_type;
+]m4_ifdef([b4_location_constructors], [
+    /// Construct a location from \a b to \a e.
+    location (const position& b, const position& e)
+      : begin (b)
+      , end (e)
+    {}
+
+    /// Construct a 0-width location in \a p.
+    explicit location (const position& p = position ())
+      : begin (p)
+      , end (p)
+    {}
+
+    /// Construct a 0-width location in \a f, \a l, \a c.
+    explicit location (filename_type* f,
+                       counter_type l = ]b4_location_initial_line[,
+                       counter_type c = ]b4_location_initial_column[)
+      : begin (f, l, c)
+      , end (f, l, c)
+    {}
+
+])[
+    /// Initialization.
+    void initialize (filename_type* f = YY_NULLPTR,
+                     counter_type l = ]b4_location_initial_line[,
+                     counter_type c = ]b4_location_initial_column[)
+    {
+      begin.initialize (f, l, c);
+      end = begin;
+    }
+
+    /** \name Line and Column related manipulators
+     ** \{ */
+  public:
+    /// Reset initial location to final location.
+    void step ()
+    {
+      begin = end;
+    }
+
+    /// Extend the current location to the COUNT next columns.
+    void columns (counter_type count = 1)
+    {
+      end += count;
+    }
+
+    /// Extend the current location to the COUNT next lines.
+    void lines (counter_type count = 1)
+    {
+      end.lines (count);
+    }
+    /** \} */
+
+
+  public:
+    /// Beginning of the located region.
+    position begin;
+    /// End of the located region.
+    position end;
+  };
+
+  /// Join two locations, in place.
+  inline location&
+  operator+= (location& res, const location& end)
+  {
+    res.end = end.end;
+    return res;
+  }
+
+  /// Join two locations.
+  inline location
+  operator+ (location res, const location& end)
+  {
+    return res += end;
+  }
+
+  /// Add \a width columns to the end position, in place.
+  inline location&
+  operator+= (location& res, location::counter_type width)
+  {
+    res.columns (width);
+    return res;
+  }
+
+  /// Add \a width columns to the end position.
+  inline location
+  operator+ (location res, location::counter_type width)
+  {
+    return res += width;
+  }
+
+  /// Subtract \a width columns to the end position, in place.
+  inline location&
+  operator-= (location& res, location::counter_type width)
+  {
+    return res += -width;
+  }
+
+  /// Subtract \a width columns to the end position.
+  inline location
+  operator- (location res, location::counter_type width)
+  {
+    return res -= width;
+  }
+]b4_percent_define_flag_if([[define_location_comparison]], [[
+  /// Compare two location objects.
+  inline bool
+  operator== (const location& loc1, const location& loc2)
+  {
+    return loc1.begin == loc2.begin && loc1.end == loc2.end;
+  }
+
+  /// Compare two location objects.
+  inline bool
+  operator!= (const location& loc1, const location& loc2)
+  {
+    return !(loc1 == loc2);
+  }
+]])[
+  /** \brief Intercept output stream redirection.
+   ** \param ostr the destination output stream
+   ** \param loc a reference to the location to redirect
+   **
+   ** Avoid duplicate information.
+   */
+  template <typename YYChar>
+  std::basic_ostream<YYChar>&
+  operator<< (std::basic_ostream<YYChar>& ostr, const location& loc)
+  {
+    location::counter_type end_col
+      = 0 < loc.end.column ? loc.end.column - 1 : 0;
+    ostr << loc.begin;
+    if (loc.end.filename
+        && (!loc.begin.filename
+            || *loc.begin.filename != *loc.end.filename))
+      ostr << '-' << loc.end.filename << ':' << loc.end.line << '.' << end_col;
+    else if (loc.begin.line < loc.end.line)
+      ostr << '-' << loc.end.line << '.' << end_col;
+    else if (loc.begin.column < end_col)
+      ostr << '-' << end_col;
+    return ostr;
+  }
+]])
+
+
+m4_ifdef([b4_position_file], [[
+]b4_output_begin([b4_dir_prefix], [b4_position_file])[
+]b4_generated_by[
+// Starting with Bison 3.2, this file is useless: the structure it
+// used to define is now defined in "]b4_location_file[".
+//
+// To get rid of this file:
+// 1. add '%require "3.2"' (or newer) to your grammar file
+// 2. remove references to this file from your build system
+// 3. if you used to include it, include "]b4_location_file[" instead.
+
+#include ]b4_location_include[
+]b4_output_end[
+]])
+
+
+m4_ifdef([b4_location_file], [[
+]b4_output_begin([b4_dir_prefix], [b4_location_file])[
+]b4_copyright([Locations for Bison parsers in C++])[
+/**
+ ** \file ]b4_location_path[
+ ** Define the ]b4_namespace_ref[::location class.
+ */
+
+]b4_cpp_guard_open([b4_location_path])[
+
+# include <iostream>
+# include <string>
+
+]b4_null_define[
+
+]b4_namespace_open[
+]b4_location_define[
+]b4_namespace_close[
+]b4_cpp_guard_close([b4_location_path])[
+]b4_output_end[
+]])
+
+
+m4_popdef([b4_copyright_years])

Engine/bin/bison-flex/data/skeletons/stack.hh

@@ -0,0 +1,157 @@
+# C++ skeleton for Bison
+
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+
+# b4_stack_file
+# -------------
+# Name of the file containing the stack class, if we want this file.
+b4_header_if([b4_required_version_if([30200], [],
+                                     [m4_define([b4_stack_file], [stack.hh])])])
+
+
+# b4_stack_define
+# ---------------
+m4_define([b4_stack_define],
+[[    /// A stack with random access from its top.
+    template <typename T, typename S = std::vector<T> >
+    class stack
+    {
+    public:
+      // Hide our reversed order.
+      typedef typename S::iterator iterator;
+      typedef typename S::const_iterator const_iterator;
+      typedef typename S::size_type size_type;
+      typedef typename std::ptrdiff_t index_type;
+
+      stack (size_type n = 200) YY_NOEXCEPT
+        : seq_ (n)
+      {}
+
+#if 201103L <= YY_CPLUSPLUS
+      /// Non copyable.
+      stack (const stack&) = delete;
+      /// Non copyable.
+      stack& operator= (const stack&) = delete;
+#endif
+
+      /// Random access.
+      ///
+      /// Index 0 returns the topmost element.
+      const T&
+      operator[] (index_type i) const
+      {
+        return seq_[size_type (size () - 1 - i)];
+      }
+
+      /// Random access.
+      ///
+      /// Index 0 returns the topmost element.
+      T&
+      operator[] (index_type i)
+      {
+        return seq_[size_type (size () - 1 - i)];
+      }
+
+      /// Steal the contents of \a t.
+      ///
+      /// Close to move-semantics.
+      void
+      push (YY_MOVE_REF (T) t)
+      {
+        seq_.push_back (T ());
+        operator[] (0).move (t);
+      }
+
+      /// Pop elements from the stack.
+      void
+      pop (std::ptrdiff_t n = 1) YY_NOEXCEPT
+      {
+        for (; 0 < n; --n)
+          seq_.pop_back ();
+      }
+
+      /// Pop all elements from the stack.
+      void
+      clear () YY_NOEXCEPT
+      {
+        seq_.clear ();
+      }
+
+      /// Number of elements on the stack.
+      index_type
+      size () const YY_NOEXCEPT
+      {
+        return index_type (seq_.size ());
+      }
+
+      /// Iterator on top of the stack (going downwards).
+      const_iterator
+      begin () const YY_NOEXCEPT
+      {
+        return seq_.begin ();
+      }
+
+      /// Bottom of the stack.
+      const_iterator
+      end () const YY_NOEXCEPT
+      {
+        return seq_.end ();
+      }
+
+      /// Present a slice of the top of a stack.
+      class slice
+      {
+      public:
+        slice (const stack& stack, index_type range) YY_NOEXCEPT
+          : stack_ (stack)
+          , range_ (range)
+        {}
+
+        const T&
+        operator[] (index_type i) const
+        {
+          return stack_[range_ - i];
+        }
+
+      private:
+        const stack& stack_;
+        index_type range_;
+      };
+
+    private:
+#if YY_CPLUSPLUS < 201103L
+      /// Non copyable.
+      stack (const stack&);
+      /// Non copyable.
+      stack& operator= (const stack&);
+#endif
+      /// The wrapped container.
+      S seq_;
+    };
+]])
+
+m4_ifdef([b4_stack_file],
+[b4_output_begin([b4_dir_prefix], [b4_stack_file])[
+]b4_generated_by[
+// Starting with Bison 3.2, this file is useless: the structure it
+// used to define is now defined with the parser itself.
+//
+// To get rid of this file:
+// 1. add '%require "3.2"' (or newer) to your grammar file
+// 2. remove references to this file from your build system.
+]b4_output_end[
+]])

Engine/bin/bison-flex/data/skeletons/traceon.m4

@@ -0,0 +1,2 @@
+dnl GNU M4 treats -dV in a position-independent manner.
+m4_debugmode(V)m4_traceon()dnl

Engine/bin/bison-flex/data/skeletons/variant.hh

@@ -0,0 +1,525 @@
+# C++ skeleton for Bison
+
+# Copyright (C) 2002-2015, 2018-2021 Free Software Foundation, Inc.
+
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+
+## --------- ##
+## variant.  ##
+## --------- ##
+
+# b4_assert
+# ---------
+# The name of YY_ASSERT.
+m4_define([b4_assert],
+          [b4_api_PREFIX[]_ASSERT])
+
+
+# b4_symbol_variant(YYTYPE, YYVAL, ACTION, [ARGS])
+# ------------------------------------------------
+# Run some ACTION ("build", or "destroy") on YYVAL of symbol type
+# YYTYPE.
+m4_define([b4_symbol_variant],
+[m4_pushdef([b4_dollar_dollar],
+            [$2.$3< $][3 > (m4_shift3($@))])dnl
+switch ($1)
+    {
+b4_type_foreach([_b4_type_action])[]dnl
+      default:
+        break;
+    }
+m4_popdef([b4_dollar_dollar])dnl
+])
+
+
+# _b4_char_sizeof_counter
+# -----------------------
+# A counter used by _b4_char_sizeof_dummy to create fresh symbols.
+m4_define([_b4_char_sizeof_counter],
+[0])
+
+# _b4_char_sizeof_dummy
+# ---------------------
+# At each call return a new C++ identifier.
+m4_define([_b4_char_sizeof_dummy],
+[m4_define([_b4_char_sizeof_counter], m4_incr(_b4_char_sizeof_counter))dnl
+dummy[]_b4_char_sizeof_counter])
+
+
+# b4_char_sizeof(SYMBOL-NUMS)
+# ---------------------------
+# To be mapped on the list of type names to produce:
+#
+#    char dummy1[sizeof (type_name_1)];
+#    char dummy2[sizeof (type_name_2)];
+#
+# for defined type names.
+m4_define([b4_char_sizeof],
+[b4_symbol_if([$1], [has_type],
+[
+m4_map([      b4_symbol_tag_comment], [$@])dnl
+      char _b4_char_sizeof_dummy@{sizeof (b4_symbol([$1], [type]))@};
+])])
+
+
+# b4_variant_includes
+# -------------------
+# The needed includes for variants support.
+m4_define([b4_variant_includes],
+[b4_parse_assert_if([[#include <typeinfo>
+#ifndef ]b4_assert[
+# include <cassert>
+# define ]b4_assert[ assert
+#endif
+]])])
+
+
+
+## -------------------------- ##
+## Adjustments for variants.  ##
+## -------------------------- ##
+
+
+# b4_value_type_declare
+# ---------------------
+# Define value_type.
+m4_define([b4_value_type_declare],
+[[  /// A buffer to store and retrieve objects.
+  ///
+  /// Sort of a variant, but does not keep track of the nature
+  /// of the stored data, since that knowledge is available
+  /// via the current parser state.
+  class value_type
+  {
+  public:
+    /// Type of *this.
+    typedef value_type self_type;
+
+    /// Empty construction.
+    value_type () YY_NOEXCEPT
+      : yyraw_ ()]b4_parse_assert_if([
+      , yytypeid_ (YY_NULLPTR)])[
+    {}
+
+    /// Construct and fill.
+    template <typename T>
+    value_type (YY_RVREF (T) t)]b4_parse_assert_if([
+      : yytypeid_ (&typeid (T))])[
+    {]b4_parse_assert_if([[
+      ]b4_assert[ (sizeof (T) <= size);]])[
+      new (yyas_<T> ()) T (YY_MOVE (t));
+    }
+
+#if 201103L <= YY_CPLUSPLUS
+    /// Non copyable.
+    value_type (const self_type&) = delete;
+    /// Non copyable.
+    self_type& operator= (const self_type&) = delete;
+#endif
+
+    /// Destruction, allowed only if empty.
+    ~value_type () YY_NOEXCEPT
+    {]b4_parse_assert_if([
+      ]b4_assert[ (!yytypeid_);
+    ])[}
+
+# if 201103L <= YY_CPLUSPLUS
+    /// Instantiate a \a T in here from \a t.
+    template <typename T, typename... U>
+    T&
+    emplace (U&&... u)
+    {]b4_parse_assert_if([[
+      ]b4_assert[ (!yytypeid_);
+      ]b4_assert[ (sizeof (T) <= size);
+      yytypeid_ = & typeid (T);]])[
+      return *new (yyas_<T> ()) T (std::forward <U>(u)...);
+    }
+# else
+    /// Instantiate an empty \a T in here.
+    template <typename T>
+    T&
+    emplace ()
+    {]b4_parse_assert_if([[
+      ]b4_assert[ (!yytypeid_);
+      ]b4_assert[ (sizeof (T) <= size);
+      yytypeid_ = & typeid (T);]])[
+      return *new (yyas_<T> ()) T ();
+    }
+
+    /// Instantiate a \a T in here from \a t.
+    template <typename T>
+    T&
+    emplace (const T& t)
+    {]b4_parse_assert_if([[
+      ]b4_assert[ (!yytypeid_);
+      ]b4_assert[ (sizeof (T) <= size);
+      yytypeid_ = & typeid (T);]])[
+      return *new (yyas_<T> ()) T (t);
+    }
+# endif
+
+    /// Instantiate an empty \a T in here.
+    /// Obsolete, use emplace.
+    template <typename T>
+    T&
+    build ()
+    {
+      return emplace<T> ();
+    }
+
+    /// Instantiate a \a T in here from \a t.
+    /// Obsolete, use emplace.
+    template <typename T>
+    T&
+    build (const T& t)
+    {
+      return emplace<T> (t);
+    }
+
+    /// Accessor to a built \a T.
+    template <typename T>
+    T&
+    as () YY_NOEXCEPT
+    {]b4_parse_assert_if([[
+      ]b4_assert[ (yytypeid_);
+      ]b4_assert[ (*yytypeid_ == typeid (T));
+      ]b4_assert[ (sizeof (T) <= size);]])[
+      return *yyas_<T> ();
+    }
+
+    /// Const accessor to a built \a T (for %printer).
+    template <typename T>
+    const T&
+    as () const YY_NOEXCEPT
+    {]b4_parse_assert_if([[
+      ]b4_assert[ (yytypeid_);
+      ]b4_assert[ (*yytypeid_ == typeid (T));
+      ]b4_assert[ (sizeof (T) <= size);]])[
+      return *yyas_<T> ();
+    }
+
+    /// Swap the content with \a that, of same type.
+    ///
+    /// Both variants must be built beforehand, because swapping the actual
+    /// data requires reading it (with as()), and this is not possible on
+    /// unconstructed variants: it would require some dynamic testing, which
+    /// should not be the variant's responsibility.
+    /// Swapping between built and (possibly) non-built is done with
+    /// self_type::move ().
+    template <typename T>
+    void
+    swap (self_type& that) YY_NOEXCEPT
+    {]b4_parse_assert_if([[
+      ]b4_assert[ (yytypeid_);
+      ]b4_assert[ (*yytypeid_ == *that.yytypeid_);]])[
+      std::swap (as<T> (), that.as<T> ());
+    }
+
+    /// Move the content of \a that to this.
+    ///
+    /// Destroys \a that.
+    template <typename T>
+    void
+    move (self_type& that)
+    {
+# if 201103L <= YY_CPLUSPLUS
+      emplace<T> (std::move (that.as<T> ()));
+# else
+      emplace<T> ();
+      swap<T> (that);
+# endif
+      that.destroy<T> ();
+    }
+
+# if 201103L <= YY_CPLUSPLUS
+    /// Move the content of \a that to this.
+    template <typename T>
+    void
+    move (self_type&& that)
+    {
+      emplace<T> (std::move (that.as<T> ()));
+      that.destroy<T> ();
+    }
+#endif
+
+    /// Copy the content of \a that to this.
+    template <typename T>
+    void
+    copy (const self_type& that)
+    {
+      emplace<T> (that.as<T> ());
+    }
+
+    /// Destroy the stored \a T.
+    template <typename T>
+    void
+    destroy ()
+    {
+      as<T> ().~T ();]b4_parse_assert_if([
+      yytypeid_ = YY_NULLPTR;])[
+    }
+
+  private:
+#if YY_CPLUSPLUS < 201103L
+    /// Non copyable.
+    value_type (const self_type&);
+    /// Non copyable.
+    self_type& operator= (const self_type&);
+#endif
+
+    /// Accessor to raw memory as \a T.
+    template <typename T>
+    T*
+    yyas_ () YY_NOEXCEPT
+    {
+      void *yyp = yyraw_;
+      return static_cast<T*> (yyp);
+     }
+
+    /// Const accessor to raw memory as \a T.
+    template <typename T>
+    const T*
+    yyas_ () const YY_NOEXCEPT
+    {
+      const void *yyp = yyraw_;
+      return static_cast<const T*> (yyp);
+     }
+
+    /// An auxiliary type to compute the largest semantic type.
+    union union_type
+    {]b4_type_foreach([b4_char_sizeof])[    };
+
+    /// The size of the largest semantic type.
+    enum { size = sizeof (union_type) };
+
+    /// A buffer to store semantic values.
+    union
+    {
+      /// Strongest alignment constraints.
+      long double yyalign_me_;
+      /// A buffer large enough to store any of the semantic values.
+      char yyraw_[size];
+    };]b4_parse_assert_if([
+
+    /// Whether the content is built: if defined, the name of the stored type.
+    const std::type_info *yytypeid_;])[
+  };
+]])
+
+
+# How the semantic value is extracted when using variants.
+
+# b4_symbol_value(VAL, SYMBOL-NUM, [TYPE])
+# ----------------------------------------
+# See README.
+m4_define([b4_symbol_value],
+[m4_ifval([$3],
+          [$1.as< $3 > ()],
+          [m4_ifval([$2],
+                    [b4_symbol_if([$2], [has_type],
+                                  [$1.as < b4_symbol([$2], [type]) > ()],
+                                  [$1])],
+                    [$1])])])
+
+# b4_symbol_value_template(VAL, SYMBOL-NUM, [TYPE])
+# -------------------------------------------------
+# Same as b4_symbol_value, but used in a template method.
+m4_define([b4_symbol_value_template],
+[m4_ifval([$3],
+          [$1.template as< $3 > ()],
+          [m4_ifval([$2],
+                    [b4_symbol_if([$2], [has_type],
+                                  [$1.template as < b4_symbol([$2], [type]) > ()],
+                                  [$1])],
+                    [$1])])])
+
+
+
+## ------------- ##
+## make_SYMBOL.  ##
+## ------------- ##
+
+
+# _b4_includes_tokens(SYMBOL-NUM...)
+# ----------------------------------
+# Expands to non-empty iff one of the SYMBOL-NUM denotes
+# a token.
+m4_define([_b4_is_token],
+          [b4_symbol_if([$1], [is_token], [1])])
+m4_define([_b4_includes_tokens],
+          [m4_map([_b4_is_token], [$@])])
+
+
+# _b4_token_maker_define(SYMBOL-NUM)
+# ----------------------------------
+# Declare make_SYMBOL for SYMBOL-NUM.  Use at class-level.
+m4_define([_b4_token_maker_define],
+[b4_token_visible_if([$1],
+[#if 201103L <= YY_CPLUSPLUS
+      static
+      symbol_type
+      make_[]_b4_symbol([$1], [id]) (b4_join(
+                 b4_symbol_if([$1], [has_type],
+                 [b4_symbol([$1], [type]) v]),
+                 b4_locations_if([location_type l])))
+      {
+        return symbol_type (b4_join([token::b4_symbol([$1], [id])],
+                                    b4_symbol_if([$1], [has_type], [std::move (v)]),
+                                    b4_locations_if([std::move (l)])));
+      }
+#else
+      static
+      symbol_type
+      make_[]_b4_symbol([$1], [id]) (b4_join(
+                 b4_symbol_if([$1], [has_type],
+                 [const b4_symbol([$1], [type])& v]),
+                 b4_locations_if([const location_type& l])))
+      {
+        return symbol_type (b4_join([token::b4_symbol([$1], [id])],
+                                    b4_symbol_if([$1], [has_type], [v]),
+                                    b4_locations_if([l])));
+      }
+#endif
+])])
+
+
+# b4_token_kind(SYMBOL-NUM)
+# -------------------------
+# Some tokens don't have an ID.
+m4_define([b4_token_kind],
+[b4_symbol_if([$1], [has_id],
+              [token::b4_symbol([$1], [id])],
+              [b4_symbol([$1], [code])])])
+
+
+# _b4_tok_in(SYMBOL-NUM, ...)
+# ---------------------------
+# See b4_tok_in below.  The SYMBOL-NUMs... are tokens only.
+#
+# We iterate over the tokens to group them by "range" of token numbers (not
+# symbols numbers!).
+#
+# b4_fst is the start of that range.
+# b4_prev is the previous value.
+# b4_val is the current value.
+# If b4_val is the successor of b4_prev in token numbers, update the latter,
+#   otherwise emit the code for range b4_fst .. b4_prev.
+# $1 is also used as a terminator in the foreach, but it will not be printed.
+#
+m4_define([_b4_tok_in],
+[m4_pushdef([b4_prev], [$1])dnl
+m4_pushdef([b4_fst], [$1])dnl
+m4_pushdef([b4_sep], [])dnl
+m4_foreach([b4_val], m4_dquote(m4_shift($@, $1)),
+           [m4_if(b4_symbol(b4_val, [code]), m4_eval(b4_symbol(b4_prev, [code]) + 1), [],
+                  [b4_sep[]m4_if(b4_fst, b4_prev,
+                         [tok == b4_token_kind(b4_fst)],
+                         [(b4_token_kind(b4_fst) <= tok && tok <= b4_token_kind(b4_prev))])[]dnl
+m4_define([b4_fst], b4_val)dnl
+m4_define([b4_sep], [
+                   || ])])dnl
+m4_define([b4_prev], b4_val)])dnl
+m4_popdef([b4_sep])dnl
+m4_popdef([b4_fst])dnl
+m4_popdef([b4_prev])dnl
+])
+
+
+# _b4_filter_tokens(SYMBOL-NUM, ...)
+# ----------------------------------
+# Expand as the list of tokens amongst SYMBOL-NUM.
+m4_define([_b4_filter_tokens],
+[m4_pushdef([b4_sep])dnl
+m4_foreach([b4_val], [$@],
+           [b4_symbol_if(b4_val, [is_token], [b4_sep[]b4_val[]m4_define([b4_sep], [,])])])dnl
+m4_popdef([b4_sep])dnl
+])
+
+
+# b4_tok_in(SYMBOL-NUM, ...)
+# ---------------------------
+# A C++ conditional that checks that `tok` is a member of this list of symbol
+# numbers.
+m4_define([b4_tok_in],
+          [_$0(_b4_filter_tokens($@))])
+
+
+
+
+# _b4_symbol_constructor_define(SYMBOL-NUM...)
+# --------------------------------------------
+# Define a symbol_type constructor common to all the SYMBOL-NUM (they
+# have the same type).  Use at class-level.
+m4_define([_b4_symbol_constructor_define],
+[m4_ifval(_b4_includes_tokens($@),
+[[#if 201103L <= YY_CPLUSPLUS
+      symbol_type (]b4_join(
+          [int tok],
+          b4_symbol_if([$1], [has_type],
+                       [b4_symbol([$1], [type]) v]),
+          b4_locations_if([location_type l]))[)
+        : super_type (]b4_join([token_kind_type (tok)],
+                               b4_symbol_if([$1], [has_type], [std::move (v)]),
+                               b4_locations_if([std::move (l)]))[)
+#else
+      symbol_type (]b4_join(
+          [int tok],
+          b4_symbol_if([$1], [has_type],
+                       [const b4_symbol([$1], [type])& v]),
+          b4_locations_if([const location_type& l]))[)
+        : super_type (]b4_join([token_kind_type (tok)],
+                               b4_symbol_if([$1], [has_type], [v]),
+                               b4_locations_if([l]))[)
+#endif
+      {]b4_parse_assert_if([[
+#if !defined _MSC_VER || defined __clang__
+        ]b4_assert[ (]b4_tok_in($@)[);
+#endif
+      ]])[}
+]])])
+
+
+# b4_basic_symbol_constructor_define(SYMBOL-NUM)
+# ----------------------------------------------
+# Generate a constructor for basic_symbol from given type.
+m4_define([b4_basic_symbol_constructor_define],
+[[#if 201103L <= YY_CPLUSPLUS
+      basic_symbol (]b4_join(
+          [typename Base::kind_type t],
+          b4_symbol_if([$1], [has_type], [b4_symbol([$1], [type])&& v]),
+          b4_locations_if([location_type&& l]))[)
+        : Base (t)]b4_symbol_if([$1], [has_type], [
+        , value (std::move (v))])[]b4_locations_if([
+        , location (std::move (l))])[
+      {}
+#else
+      basic_symbol (]b4_join(
+          [typename Base::kind_type t],
+          b4_symbol_if([$1], [has_type], [const b4_symbol([$1], [type])& v]),
+          b4_locations_if([const location_type& l]))[)
+        : Base (t)]b4_symbol_if([$1], [has_type], [
+        , value (v)])[]b4_locations_if([
+        , location (l)])[
+      {}
+#endif
+]])
+
+
+# b4_token_constructor_define
+# ---------------------------
+# Define the overloaded versions of make_FOO for all the token kinds.
+m4_define([b4_token_constructor_define],
+[    // Implementation of make_symbol for each token kind.
+b4_symbol_foreach([_b4_token_maker_define])])

Engine/bin/bison-flex/data/xslt/bison.xsl

@@ -0,0 +1,105 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+    bison.xsl - common templates for Bison XSLT.
+
+    Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.
+
+    This file is part of Bison, the GNU Compiler Compiler.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+  -->
+
+<xsl:stylesheet version="1.0"
+  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+  xmlns:bison="https://www.gnu.org/software/bison/">
+
+<xsl:key
+  name="bison:symbolByName"
+  match="/bison-xml-report/grammar/nonterminals/nonterminal"
+  use="@name"
+/>
+<xsl:key
+  name="bison:symbolByName"
+  match="/bison-xml-report/grammar/terminals/terminal"
+  use="@name"
+/>
+<xsl:key
+  name="bison:ruleByNumber"
+  match="/bison-xml-report/grammar/rules/rule"
+  use="@number"
+/>
+<xsl:key
+  name="bison:ruleByLhs"
+  match="/bison-xml-report/grammar/rules/rule[
+         @usefulness != 'useless-in-grammar']"
+  use="lhs"
+/>
+<xsl:key
+  name="bison:ruleByRhs"
+  match="/bison-xml-report/grammar/rules/rule[
+         @usefulness != 'useless-in-grammar']"
+  use="rhs/symbol"
+/>
+
+<!-- For the specified state, output: #sr-conflicts,#rr-conflicts -->
+<xsl:template match="state" mode="bison:count-conflicts">
+  <xsl:variable name="transitions" select="actions/transitions"/>
+  <xsl:variable name="reductions" select="actions/reductions"/>
+  <xsl:variable
+    name="terminals"
+    select="
+      $transitions/transition[@type='shift']/@symbol
+      | $reductions/reduction/@symbol
+    "
+  />
+  <xsl:variable name="conflict-data">
+    <xsl:for-each select="$terminals">
+      <xsl:variable name="name" select="."/>
+      <xsl:if test="generate-id($terminals[. = $name][1]) = generate-id(.)">
+        <xsl:variable
+          name="shift-count"
+          select="count($transitions/transition[@symbol=$name])"
+        />
+        <xsl:variable
+          name="reduce-count"
+          select="count($reductions/reduction[@symbol=$name])"
+        />
+        <xsl:if test="$shift-count > 0 and $reduce-count > 0">
+          <xsl:text>s</xsl:text>
+        </xsl:if>
+        <xsl:if test="$reduce-count > 1">
+          <xsl:text>r</xsl:text>
+        </xsl:if>
+      </xsl:if>
+    </xsl:for-each>
+  </xsl:variable>
+  <xsl:value-of select="string-length(translate($conflict-data, 'r', ''))"/>
+  <xsl:text>,</xsl:text>
+  <xsl:value-of select="string-length(translate($conflict-data, 's', ''))"/>
+</xsl:template>
+
+<xsl:template name="space">
+  <xsl:param name="repeat">0</xsl:param>
+  <xsl:param name="fill" select="' '"/>
+  <xsl:if test="number($repeat) &gt;= 1">
+    <xsl:call-template name="space">
+      <xsl:with-param name="repeat" select="$repeat - 1"/>
+      <xsl:with-param name="fill" select="$fill"/>
+    </xsl:call-template>
+    <xsl:value-of select="$fill"/>
+  </xsl:if>
+</xsl:template>
+
+</xsl:stylesheet>

Engine/bin/bison-flex/data/xslt/xml2dot.xsl

@@ -0,0 +1,401 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+    xml2dot.xsl - transform Bison XML Report into DOT.
+
+    Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.
+
+    This file is part of Bison, the GNU Compiler Compiler.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+    Written by Wojciech Polak <polak@gnu.org>.
+  -->
+
+<xsl:stylesheet version="1.0"
+  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+  xmlns:bison="https://www.gnu.org/software/bison/">
+
+<xsl:import href="bison.xsl"/>
+<xsl:output method="text" encoding="UTF-8" indent="no"/>
+
+<xsl:template match="/">
+  <xsl:apply-templates select="bison-xml-report"/>
+</xsl:template>
+
+<xsl:template match="bison-xml-report">
+  <xsl:text>// Generated by GNU Bison </xsl:text>
+  <xsl:value-of select="@version"/>
+  <xsl:text>.&#10;</xsl:text>
+  <xsl:text>// Report bugs to &lt;</xsl:text>
+  <xsl:value-of select="@bug-report"/>
+  <xsl:text>&gt;.&#10;</xsl:text>
+  <xsl:text>// Home page: &lt;</xsl:text>
+  <xsl:value-of select="@url"/>
+  <xsl:text>&gt;.&#10;&#10;</xsl:text>
+  <xsl:apply-templates select="automaton">
+    <xsl:with-param name="filename" select="filename"/>
+  </xsl:apply-templates>
+</xsl:template>
+
+<xsl:template match="automaton">
+  <xsl:param name="filename"/>
+  <xsl:text>digraph "</xsl:text>
+  <xsl:call-template name="escape">
+    <xsl:with-param name="subject" select="$filename"/>
+  </xsl:call-template>
+  <xsl:text>"&#10;{
+  node [fontname = courier, shape = box, colorscheme = paired6]
+  edge [fontname = courier]
+
+</xsl:text>
+  <xsl:apply-templates select="state"/>
+  <xsl:text>}&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template match="automaton/state">
+  <xsl:call-template name="output-node">
+    <xsl:with-param name="number" select="@number"/>
+    <xsl:with-param name="label">
+      <xsl:apply-templates select="itemset/item"/>
+    </xsl:with-param>
+  </xsl:call-template>
+  <xsl:apply-templates select="actions/transitions"/>
+  <xsl:apply-templates select="actions/reductions">
+    <xsl:with-param name="staten">
+      <xsl:value-of select="@number"/>
+    </xsl:with-param>
+  </xsl:apply-templates>
+</xsl:template>
+
+<xsl:template match="actions/reductions">
+  <xsl:param name="staten"/>
+  <xsl:for-each select='reduction'>
+    <!-- These variables are needed because the current context can't be
+         referred to directly in XPath expressions. -->
+    <xsl:variable name="rul">
+      <xsl:value-of select="@rule"/>
+    </xsl:variable>
+    <xsl:variable name="ena">
+      <xsl:value-of select="@enabled"/>
+    </xsl:variable>
+    <!-- The foreach's body is protected by this, so that we are actually
+         going to iterate once per reduction rule, and not per lookahead. -->
+    <xsl:if test='not(preceding-sibling::*[@rule=$rul and @enabled=$ena])'>
+      <xsl:variable name="rule">
+        <xsl:choose>
+          <!-- The acceptation state is referred to as 'accept' in the XML, but
+               just as '0' in the DOT. -->
+          <xsl:when test="@rule='accept'">
+            <xsl:text>0</xsl:text>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:value-of select="@rule"/>
+          </xsl:otherwise>
+        </xsl:choose>
+      </xsl:variable>
+
+      <!-- The edge's beginning -->
+      <xsl:call-template name="reduction-edge-start">
+        <xsl:with-param name="state" select="$staten"/>
+        <xsl:with-param name="rule" select="$rule"/>
+        <xsl:with-param name="enabled" select="@enabled"/>
+      </xsl:call-template>
+
+      <!-- The edge's tokens -->
+      <!-- Don't show labels for the default action. In other cases, there will
+           always be at least one token, so 'label="[]"' will not occur. -->
+      <xsl:if test='$rule!=0 and not(../reduction[@enabled=$ena and @rule=$rule and @symbol="$default"])'>
+        <xsl:text>label="[</xsl:text>
+        <xsl:for-each select='../reduction[@enabled=$ena and @rule=$rule]'>
+          <xsl:call-template name="escape">
+            <xsl:with-param name="subject" select="@symbol"/>
+          </xsl:call-template>
+          <xsl:if test="position() != last ()">
+            <xsl:text>, </xsl:text>
+          </xsl:if>
+        </xsl:for-each>
+        <xsl:text>]", </xsl:text>
+      </xsl:if>
+
+      <!-- The edge's end -->
+      <xsl:text>style=solid]&#10;</xsl:text>
+
+      <!-- The diamond representing the reduction -->
+      <xsl:call-template name="reduction-node">
+        <xsl:with-param name="state" select="$staten"/>
+        <xsl:with-param name="rule" select="$rule"/>
+        <xsl:with-param name="color">
+          <xsl:choose>
+            <xsl:when test='@enabled="true"'>
+              <xsl:text>3</xsl:text>
+            </xsl:when>
+            <xsl:otherwise>
+              <xsl:text>5</xsl:text>
+            </xsl:otherwise>
+          </xsl:choose>
+        </xsl:with-param>
+      </xsl:call-template>
+    </xsl:if>
+  </xsl:for-each>
+</xsl:template>
+
+<xsl:template match="actions/transitions">
+  <xsl:apply-templates select="transition"/>
+</xsl:template>
+
+<xsl:template match="item">
+  <xsl:param name="prev-rule-number"
+    select="preceding-sibling::item[1]/@rule-number"/>
+  <xsl:apply-templates select="key('bison:ruleByNumber', @rule-number)">
+    <xsl:with-param name="dot" select="@dot"/>
+    <xsl:with-param name="num" select="@rule-number"/>
+    <xsl:with-param name="prev-lhs"
+      select="key('bison:ruleByNumber', $prev-rule-number)/lhs[text()]"
+   />
+  </xsl:apply-templates>
+  <xsl:apply-templates select="lookaheads"/>
+</xsl:template>
+
+<xsl:template match="rule">
+  <xsl:param name="dot"/>
+  <xsl:param name="num"/>
+  <xsl:param name="prev-lhs"/>
+  <xsl:text>&#10;</xsl:text>
+  <xsl:choose>
+    <xsl:when test="$num &lt; 10">
+      <xsl:text>  </xsl:text>
+    </xsl:when>
+    <xsl:when test="$num &lt; 100">
+      <xsl:text> </xsl:text>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:text></xsl:text>
+    </xsl:otherwise>
+  </xsl:choose>
+  <xsl:value-of select="$num"/>
+  <xsl:text> </xsl:text>
+  <xsl:choose>
+  <xsl:when test="$prev-lhs = lhs[text()]">
+      <xsl:call-template name="lpad">
+        <xsl:with-param name="str" select="'|'"/>
+        <xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 1"/>
+      </xsl:call-template>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:value-of select="lhs"/>
+      <xsl:text>:</xsl:text>
+    </xsl:otherwise>
+  </xsl:choose>
+  <xsl:if test="$dot = 0">
+    <xsl:text> .</xsl:text>
+  </xsl:if>
+
+  <!-- RHS -->
+  <xsl:for-each select="rhs/symbol|rhs/empty">
+    <xsl:apply-templates select="."/>
+    <xsl:if test="$dot = position()">
+      <xsl:text> .</xsl:text>
+    </xsl:if>
+  </xsl:for-each>
+</xsl:template>
+
+<xsl:template match="symbol">
+  <xsl:text> </xsl:text>
+  <xsl:value-of select="."/>
+</xsl:template>
+
+<xsl:template match="empty">
+  <xsl:text> %empty</xsl:text>
+</xsl:template>
+
+<xsl:template match="lookaheads">
+  <xsl:text>  [</xsl:text>
+  <xsl:apply-templates select="symbol"/>
+  <xsl:text>]</xsl:text>
+</xsl:template>
+
+<xsl:template match="lookaheads/symbol">
+  <xsl:value-of select="."/>
+  <xsl:if test="position() != last()">
+    <xsl:text>, </xsl:text>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template name="reduction-edge-start">
+  <xsl:param name="state"/>
+  <xsl:param name="rule"/>
+  <xsl:param name="enabled"/>
+
+  <xsl:text>  </xsl:text>
+  <xsl:value-of select="$state"/>
+  <xsl:text> -> "</xsl:text>
+  <xsl:value-of select="$state"/>
+  <xsl:text>R</xsl:text>
+  <xsl:value-of select="$rule"/>
+  <xsl:if test='$enabled = "false"'>
+    <xsl:text>d</xsl:text>
+  </xsl:if>
+  <xsl:text>" [</xsl:text>
+</xsl:template>
+
+<xsl:template name="reduction-node">
+  <xsl:param name="state"/>
+  <xsl:param name="rule"/>
+  <xsl:param name="color"/>
+
+  <xsl:text> "</xsl:text>
+  <xsl:value-of select="$state"/>
+  <xsl:text>R</xsl:text>
+  <xsl:value-of select="$rule"/>
+  <xsl:if test="$color = 5">
+    <xsl:text>d</xsl:text>
+  </xsl:if>
+  <xsl:text>" [label="</xsl:text>
+  <xsl:choose>
+  <xsl:when test="$rule = 0">
+    <xsl:text>Acc", fillcolor=1</xsl:text>
+  </xsl:when>
+  <xsl:otherwise>
+    <xsl:text>R</xsl:text>
+    <xsl:value-of select="$rule"/>
+    <xsl:text>", fillcolor=</xsl:text>
+    <xsl:value-of select="$color"/>
+  </xsl:otherwise>
+  </xsl:choose>
+  <xsl:text>, shape=diamond, style=filled]&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template match="transition">
+  <xsl:call-template name="output-edge">
+    <xsl:with-param name="src" select="../../../@number"/>
+    <xsl:with-param name="dst" select="@state"/>
+    <xsl:with-param name="style">
+      <xsl:choose>
+        <xsl:when test="@symbol = 'error'">
+          <xsl:text>dotted</xsl:text>
+        </xsl:when>
+        <xsl:when test="@type = 'shift'">
+          <xsl:text>solid</xsl:text>
+        </xsl:when>
+        <xsl:otherwise>
+          <xsl:text>dashed</xsl:text>
+        </xsl:otherwise>
+      </xsl:choose>
+    </xsl:with-param>
+    <xsl:with-param name="label">
+      <xsl:if test="not(@symbol = 'error')">
+        <xsl:value-of select="@symbol"/>
+      </xsl:if>
+    </xsl:with-param>
+  </xsl:call-template>
+</xsl:template>
+
+<xsl:template name="output-node">
+  <xsl:param name="number"/>
+  <xsl:param name="label"/>
+  <xsl:text>  </xsl:text>
+  <xsl:value-of select="$number"/>
+  <xsl:text> [label="</xsl:text>
+  <xsl:text>State </xsl:text>
+  <xsl:value-of select="$number"/>
+  <xsl:text>\n</xsl:text>
+  <xsl:call-template name="escape">
+    <xsl:with-param name="subject" select="$label"/>
+  </xsl:call-template>
+  <xsl:text>\l"]&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template name="output-edge">
+  <xsl:param name="src"/>
+  <xsl:param name="dst"/>
+  <xsl:param name="style"/>
+  <xsl:param name="label"/>
+  <xsl:text>  </xsl:text>
+  <xsl:value-of select="$src"/>
+  <xsl:text> -> </xsl:text>
+  <xsl:value-of select="$dst"/>
+  <xsl:text> [style=</xsl:text>
+  <xsl:value-of select="$style"/>
+  <xsl:if test="$label and $label != ''">
+    <xsl:text> label="</xsl:text>
+    <xsl:call-template name="escape">
+      <xsl:with-param name="subject" select="$label"/>
+    </xsl:call-template>
+    <xsl:text>"</xsl:text>
+  </xsl:if>
+  <xsl:text>]&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template name="escape">
+  <xsl:param name="subject"/> <!-- required -->
+  <xsl:call-template name="string-replace">
+    <xsl:with-param name="subject">
+      <xsl:call-template name="string-replace">
+        <xsl:with-param name="subject">
+          <xsl:call-template name="string-replace">
+            <xsl:with-param name="subject" select="$subject"/>
+            <xsl:with-param name="search" select="'\'"/>
+            <xsl:with-param name="replace" select="'\\'"/>
+          </xsl:call-template>
+        </xsl:with-param>
+        <xsl:with-param name="search" select="'&quot;'"/>
+        <xsl:with-param name="replace" select="'\&quot;'"/>
+      </xsl:call-template>
+    </xsl:with-param>
+    <xsl:with-param name="search" select="'&#10;'"/>
+    <xsl:with-param name="replace" select="'\l'"/>
+  </xsl:call-template>
+</xsl:template>
+
+<xsl:template name="string-replace">
+  <xsl:param name="subject"/>
+  <xsl:param name="search"/>
+  <xsl:param name="replace"/>
+  <xsl:choose>
+    <xsl:when test="contains($subject, $search)">
+      <xsl:variable name="before" select="substring-before($subject, $search)"/>
+      <xsl:variable name="after" select="substring-after($subject, $search)"/>
+      <xsl:value-of select="$before"/>
+      <xsl:value-of select="$replace"/>
+      <xsl:call-template name="string-replace">
+        <xsl:with-param name="subject" select="$after"/>
+        <xsl:with-param name="search" select="$search"/>
+        <xsl:with-param name="replace" select="$replace"/>
+      </xsl:call-template>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:value-of select="$subject"/>
+    </xsl:otherwise>
+  </xsl:choose>
+</xsl:template>
+
+<xsl:template name="lpad">
+  <xsl:param name="str" select="''"/>
+  <xsl:param name="pad" select="0"/>
+  <xsl:variable name="diff" select="$pad - string-length($str)" />
+  <xsl:choose>
+    <xsl:when test="$diff &lt; 0">
+      <xsl:value-of select="$str"/>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:call-template name="space">
+        <xsl:with-param name="repeat" select="$diff"/>
+      </xsl:call-template>
+      <xsl:value-of select="$str"/>
+    </xsl:otherwise>
+  </xsl:choose>
+</xsl:template>
+
+</xsl:stylesheet>

Engine/bin/bison-flex/data/xslt/xml2text.xsl

@@ -0,0 +1,572 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+    xml2text.xsl - transform Bison XML Report into plain text.
+
+    Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.
+
+    This file is part of Bison, the GNU Compiler Compiler.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+    Written by Wojciech Polak <polak@gnu.org>.
+  -->
+
+<xsl:stylesheet version="1.0"
+  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+  xmlns:bison="https://www.gnu.org/software/bison/">
+
+<xsl:import href="bison.xsl"/>
+<xsl:output method="text" encoding="UTF-8" indent="no"/>
+
+<xsl:template match="/">
+  <xsl:apply-templates select="bison-xml-report"/>
+</xsl:template>
+
+<xsl:template match="bison-xml-report">
+  <xsl:apply-templates select="grammar" mode="reductions"/>
+  <xsl:apply-templates select="grammar" mode="useless-in-parser"/>
+  <xsl:apply-templates select="automaton" mode="conflicts"/>
+  <xsl:apply-templates select="grammar"/>
+  <xsl:apply-templates select="automaton"/>
+</xsl:template>
+
+<xsl:template match="grammar" mode="reductions">
+  <xsl:apply-templates select="nonterminals" mode="useless-in-grammar"/>
+  <xsl:apply-templates select="terminals" mode="unused-in-grammar"/>
+  <xsl:apply-templates select="rules" mode="useless-in-grammar"/>
+</xsl:template>
+
+<xsl:template match="nonterminals" mode="useless-in-grammar">
+  <xsl:if test="nonterminal[@usefulness='useless-in-grammar']">
+    <xsl:text>Nonterminals useless in grammar&#10;&#10;</xsl:text>
+    <xsl:for-each select="nonterminal[@usefulness='useless-in-grammar']">
+      <xsl:text>    </xsl:text>
+      <xsl:value-of select="@name"/>
+      <xsl:text>&#10;</xsl:text>
+    </xsl:for-each>
+    <xsl:text>&#10;&#10;</xsl:text>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="terminals" mode="unused-in-grammar">
+  <xsl:if test="terminal[@usefulness='unused-in-grammar']">
+    <xsl:text>Terminals unused in grammar&#10;&#10;</xsl:text>
+    <xsl:for-each select="terminal[@usefulness='unused-in-grammar']">
+      <xsl:sort select="@symbol-number" data-type="number"/>
+      <xsl:text>    </xsl:text>
+      <xsl:value-of select="@name"/>
+      <xsl:text>&#10;</xsl:text>
+    </xsl:for-each>
+    <xsl:text>&#10;&#10;</xsl:text>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="rules" mode="useless-in-grammar">
+  <xsl:variable name="set" select="rule[@usefulness='useless-in-grammar']"/>
+  <xsl:if test="$set">
+    <xsl:text>Rules useless in grammar&#10;</xsl:text>
+    <xsl:call-template name="style-rule-set">
+      <xsl:with-param name="rule-set" select="$set"/>
+    </xsl:call-template>
+    <xsl:text>&#10;&#10;</xsl:text>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="grammar" mode="useless-in-parser">
+  <xsl:variable
+    name="set" select="rules/rule[@usefulness='useless-in-parser']"
+  />
+  <xsl:if test="$set">
+    <xsl:text>Rules useless in parser due to conflicts&#10;</xsl:text>
+    <xsl:call-template name="style-rule-set">
+      <xsl:with-param name="rule-set" select="$set"/>
+    </xsl:call-template>
+    <xsl:text>&#10;&#10;</xsl:text>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="grammar">
+  <xsl:text>Grammar&#10;</xsl:text>
+  <xsl:call-template name="style-rule-set">
+    <xsl:with-param
+      name="rule-set" select="rules/rule[@usefulness!='useless-in-grammar']"
+    />
+  </xsl:call-template>
+  <xsl:text>&#10;&#10;</xsl:text>
+  <xsl:apply-templates select="terminals"/>
+  <xsl:apply-templates select="nonterminals"/>
+</xsl:template>
+
+<xsl:template name="style-rule-set">
+  <xsl:param name="rule-set"/>
+  <xsl:for-each select="$rule-set">
+    <xsl:apply-templates select=".">
+      <xsl:with-param name="pad" select="'3'"/>
+      <xsl:with-param name="prev-lhs">
+        <xsl:if test="position()>1">
+          <xsl:variable name="position" select="position()"/>
+          <xsl:value-of select="$rule-set[$position - 1]/lhs"/>
+        </xsl:if>
+      </xsl:with-param>
+    </xsl:apply-templates>
+  </xsl:for-each>
+</xsl:template>
+
+<xsl:template match="grammar/terminals">
+  <xsl:text>Terminals, with rules where they appear&#10;&#10;</xsl:text>
+  <xsl:apply-templates select="terminal"/>
+  <xsl:text>&#10;&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template match="grammar/nonterminals">
+  <xsl:text>Nonterminals, with rules where they appear&#10;&#10;</xsl:text>
+  <xsl:apply-templates select="nonterminal[@usefulness!='useless-in-grammar']"/>
+</xsl:template>
+
+<xsl:template match="terminal">
+  <xsl:text>    </xsl:text>
+  <xsl:value-of select="@name"/>
+  <xsl:call-template name="line-wrap">
+    <xsl:with-param name="first-line-length">
+      <xsl:choose>
+        <xsl:when test="string-length(@name) &gt; 66">0</xsl:when>
+        <xsl:otherwise>
+          <xsl:value-of select="66 - string-length(@name)" />
+        </xsl:otherwise>
+      </xsl:choose>
+    </xsl:with-param>
+    <xsl:with-param name="line-length" select="66" />
+    <xsl:with-param name="text">
+      <xsl:if test="string-length(@type) != 0">
+        <xsl:value-of select="concat(' &lt;', @type, '&gt;')"/>
+      </xsl:if>
+      <xsl:value-of select="concat(' (', @token-number, ')')"/>
+      <xsl:for-each select="key('bison:ruleByRhs', @name)">
+        <xsl:value-of select="concat(' ', @number)"/>
+      </xsl:for-each>
+    </xsl:with-param>
+  </xsl:call-template>
+</xsl:template>
+
+<xsl:template match="nonterminal">
+  <xsl:text>    </xsl:text>
+  <xsl:value-of select="@name"/>
+  <xsl:if test="string-length(@type) != 0">
+    <xsl:value-of select="concat(' &lt;', @type, '&gt;')"/>
+  </xsl:if>
+  <xsl:value-of select="concat(' (', @symbol-number, ')')"/>
+  <xsl:text>&#10;</xsl:text>
+  <xsl:variable name="output">
+    <xsl:call-template name="line-wrap">
+      <xsl:with-param name="line-length" select="66" />
+      <xsl:with-param name="text">
+        <xsl:text>        </xsl:text>
+        <xsl:if test="key('bison:ruleByLhs', @name)">
+          <xsl:text>on@left:</xsl:text>
+          <xsl:for-each select="key('bison:ruleByLhs', @name)">
+            <xsl:value-of select="concat(' ', @number)"/>
+          </xsl:for-each>
+        </xsl:if>
+        <xsl:if test="key('bison:ruleByRhs', @name)">
+          <xsl:if test="key('bison:ruleByLhs', @name)">
+            <xsl:text>&#10;        </xsl:text>
+          </xsl:if>
+          <xsl:text>on@right:</xsl:text>
+          <xsl:for-each select="key('bison:ruleByRhs', @name)">
+            <xsl:value-of select="concat(' ', @number)"/>
+          </xsl:for-each>
+        </xsl:if>
+      </xsl:with-param>
+    </xsl:call-template>
+  </xsl:variable>
+  <xsl:value-of select="translate($output, '@', ' ')" />
+</xsl:template>
+
+<xsl:template match="automaton" mode="conflicts">
+  <xsl:variable name="conflict-report">
+    <xsl:apply-templates select="state" mode="conflicts"/>
+  </xsl:variable>
+  <xsl:if test="string-length($conflict-report) != 0">
+    <xsl:value-of select="$conflict-report"/>
+    <xsl:text>&#10;&#10;</xsl:text>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="state" mode="conflicts">
+  <xsl:variable name="conflict-counts">
+    <xsl:apply-templates select="." mode="bison:count-conflicts" />
+  </xsl:variable>
+  <xsl:variable
+    name="sr-count" select="substring-before($conflict-counts, ',')"
+  />
+  <xsl:variable
+    name="rr-count" select="substring-after($conflict-counts, ',')"
+  />
+  <xsl:if test="$sr-count > 0 or $rr-count > 0">
+    <xsl:value-of select="concat('State ', @number, ' conflicts:')"/>
+    <xsl:if test="$sr-count > 0">
+      <xsl:value-of select="concat(' ', $sr-count, ' shift/reduce')"/>
+      <xsl:if test="$rr-count > 0">
+        <xsl:value-of select="(',')"/>
+      </xsl:if>
+    </xsl:if>
+    <xsl:if test="$rr-count > 0">
+      <xsl:value-of select="concat(' ', $rr-count, ' reduce/reduce')"/>
+    </xsl:if>
+    <xsl:value-of select="'&#10;'"/>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="automaton">
+  <xsl:apply-templates select="state">
+    <xsl:with-param name="pad" select="'3'"/>
+  </xsl:apply-templates>
+</xsl:template>
+
+<xsl:template match="automaton/state">
+  <xsl:param name="pad"/>
+  <xsl:text>&#10;&#10;</xsl:text>
+  <xsl:text>State </xsl:text>
+  <xsl:value-of select="@number"/>
+  <xsl:text>&#10;&#10;</xsl:text>
+  <xsl:apply-templates select="itemset/item">
+    <xsl:with-param name="pad" select="$pad"/>
+  </xsl:apply-templates>
+  <xsl:apply-templates select="actions/transitions">
+    <xsl:with-param name="type" select="'shift'"/>
+  </xsl:apply-templates>
+  <xsl:apply-templates select="actions/errors"/>
+  <xsl:apply-templates select="actions/reductions"/>
+  <xsl:apply-templates select="actions/transitions">
+    <xsl:with-param name="type" select="'goto'"/>
+  </xsl:apply-templates>
+  <xsl:apply-templates select="solved-conflicts"/>
+</xsl:template>
+
+<xsl:template match="actions/transitions">
+  <xsl:param name="type"/>
+  <xsl:if test="transition[@type = $type]">
+    <xsl:text>&#10;</xsl:text>
+    <xsl:apply-templates select="transition[@type = $type]">
+      <xsl:with-param name="pad">
+        <xsl:call-template name="max-width-symbol">
+          <xsl:with-param name="node" select="transition[@type = $type]"/>
+        </xsl:call-template>
+      </xsl:with-param>
+    </xsl:apply-templates>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="actions/errors">
+  <xsl:if test="error">
+    <xsl:text>&#10;</xsl:text>
+    <xsl:apply-templates select="error">
+      <xsl:with-param name="pad">
+        <xsl:call-template name="max-width-symbol">
+          <xsl:with-param name="node" select="error"/>
+        </xsl:call-template>
+      </xsl:with-param>
+    </xsl:apply-templates>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="actions/reductions">
+  <xsl:if test="reduction">
+    <xsl:text>&#10;</xsl:text>
+    <xsl:apply-templates select="reduction">
+      <xsl:with-param name="pad">
+        <xsl:call-template name="max-width-symbol">
+          <xsl:with-param name="node" select="reduction"/>
+        </xsl:call-template>
+      </xsl:with-param>
+    </xsl:apply-templates>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="item">
+  <xsl:param name="pad"/>
+  <xsl:param name="prev-rule-number"
+             select="preceding-sibling::item[1]/@rule-number"/>
+  <xsl:apply-templates
+    select="key('bison:ruleByNumber', current()/@rule-number)"
+  >
+    <xsl:with-param name="itemset" select="'true'"/>
+    <xsl:with-param name="pad" select="$pad"/>
+    <xsl:with-param
+      name="prev-lhs"
+      select="key('bison:ruleByNumber', $prev-rule-number)/lhs[text()]"
+   />
+    <xsl:with-param name="dot" select="@dot"/>
+    <xsl:with-param name="lookaheads">
+      <xsl:apply-templates select="lookaheads"/>
+    </xsl:with-param>
+  </xsl:apply-templates>
+</xsl:template>
+
+<xsl:template match="rule">
+  <xsl:param name="itemset"/>
+  <xsl:param name="pad"/>
+  <xsl:param name="prev-lhs"/>
+  <xsl:param name="dot"/>
+  <xsl:param name="lookaheads"/>
+
+  <xsl:if test="$itemset != 'true' and not($prev-lhs = lhs[text()])">
+    <xsl:text>&#10;</xsl:text>
+  </xsl:if>
+
+  <xsl:text>  </xsl:text>
+  <xsl:call-template name="lpad">
+    <xsl:with-param name="str" select="string(@number)"/>
+    <xsl:with-param name="pad" select="number($pad)"/>
+  </xsl:call-template>
+  <xsl:text> </xsl:text>
+
+  <!-- LHS -->
+  <xsl:choose>
+    <xsl:when test="$itemset != 'true' and $prev-lhs = lhs[text()]">
+      <xsl:call-template name="lpad">
+        <xsl:with-param name="str" select="'|'"/>
+        <xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 1"/>
+      </xsl:call-template>
+    </xsl:when>
+    <xsl:when test="$itemset = 'true' and $prev-lhs = lhs[text()]">
+      <xsl:call-template name="lpad">
+        <xsl:with-param name="str" select="'|'"/>
+        <xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 1"/>
+      </xsl:call-template>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:value-of select="lhs"/>
+      <xsl:text>:</xsl:text>
+    </xsl:otherwise>
+  </xsl:choose>
+
+  <!-- RHS -->
+  <xsl:for-each select="rhs/*">
+    <xsl:if test="position() = $dot + 1">
+      <xsl:text> •</xsl:text>
+    </xsl:if>
+    <xsl:apply-templates select="."/>
+    <xsl:if test="position() = last() and position() = $dot">
+      <xsl:text> •</xsl:text>
+    </xsl:if>
+  </xsl:for-each>
+  <xsl:if test="$lookaheads">
+    <xsl:value-of select="$lookaheads"/>
+  </xsl:if>
+
+  <xsl:text>&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template match="symbol">
+  <xsl:text> </xsl:text>
+  <xsl:value-of select="."/>
+</xsl:template>
+
+<xsl:template match="empty">
+  <xsl:text> %empty</xsl:text>
+</xsl:template>
+
+<xsl:template match="lookaheads">
+  <xsl:text>  [</xsl:text>
+  <xsl:apply-templates select="symbol"/>
+  <xsl:text>]</xsl:text>
+</xsl:template>
+
+<xsl:template match="lookaheads/symbol">
+  <xsl:value-of select="."/>
+  <xsl:if test="position() != last()">
+    <xsl:text>, </xsl:text>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="transition">
+  <xsl:param name="pad"/>
+  <xsl:text>    </xsl:text>
+  <xsl:call-template name="rpad">
+    <xsl:with-param name="str" select="string(@symbol)"/>
+    <xsl:with-param name="pad" select="number($pad) + 2"/>
+  </xsl:call-template>
+  <xsl:choose>
+    <xsl:when test="@type = 'shift'">
+      <xsl:text>shift, and go to state </xsl:text>
+      <xsl:value-of select="@state"/>
+    </xsl:when>
+    <xsl:when test="@type = 'goto'">
+      <xsl:text>go to state </xsl:text>
+      <xsl:value-of select="@state"/>
+    </xsl:when>
+  </xsl:choose>
+  <xsl:text>&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template match="error">
+  <xsl:param name="pad"/>
+  <xsl:text>    </xsl:text>
+  <xsl:call-template name="rpad">
+    <xsl:with-param name="str" select="string(@symbol)"/>
+    <xsl:with-param name="pad" select="number($pad) + 2"/>
+  </xsl:call-template>
+  <xsl:text>error</xsl:text>
+  <xsl:text> (</xsl:text>
+  <xsl:value-of select="text()"/>
+  <xsl:text>)</xsl:text>
+  <xsl:text>&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template match="reduction">
+  <xsl:param name="pad"/>
+  <xsl:text>    </xsl:text>
+  <xsl:call-template name="rpad">
+    <xsl:with-param name="str" select="string(@symbol)"/>
+    <xsl:with-param name="pad" select="number($pad) + 2"/>
+  </xsl:call-template>
+  <xsl:if test="@enabled = 'false'">
+    <xsl:text>[</xsl:text>
+  </xsl:if>
+  <xsl:choose>
+    <xsl:when test="@rule = 'accept'">
+      <xsl:text>accept</xsl:text>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:text>reduce using rule </xsl:text>
+      <xsl:value-of select="@rule"/>
+      <xsl:text> (</xsl:text>
+      <xsl:value-of
+          select="key('bison:ruleByNumber', current()/@rule)/lhs[text()]"/>
+      <xsl:text>)</xsl:text>
+    </xsl:otherwise>
+  </xsl:choose>
+  <xsl:if test="@enabled = 'false'">
+    <xsl:text>]</xsl:text>
+  </xsl:if>
+  <xsl:text>&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template match="solved-conflicts">
+  <xsl:if test="resolution">
+    <xsl:text>&#10;</xsl:text>
+    <xsl:apply-templates select="resolution"/>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="resolution">
+  <xsl:text>    Conflict between rule </xsl:text>
+  <xsl:value-of select="@rule"/>
+  <xsl:text> and token </xsl:text>
+  <xsl:value-of select="@symbol"/>
+  <xsl:text> resolved as </xsl:text>
+  <xsl:if test="@type = 'error'">
+    <xsl:text>an </xsl:text>
+  </xsl:if>
+  <xsl:value-of select="@type"/>
+  <xsl:text> (</xsl:text>
+  <xsl:value-of select="."/>
+  <xsl:text>).&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template name="max-width-symbol">
+  <xsl:param name="node"/>
+  <xsl:variable name="longest">
+    <xsl:for-each select="$node">
+      <xsl:sort data-type="number" select="string-length(@symbol)"
+                order="descending"/>
+      <xsl:if test="position() = 1">
+        <xsl:value-of select="string-length(@symbol)"/>
+      </xsl:if>
+    </xsl:for-each>
+  </xsl:variable>
+  <xsl:value-of select="$longest"/>
+</xsl:template>
+
+<xsl:template name="lpad">
+  <xsl:param name="str" select="''"/>
+  <xsl:param name="pad" select="0"/>
+  <xsl:variable name="diff" select="$pad - string-length($str)" />
+  <xsl:choose>
+    <xsl:when test="$diff &lt; 0">
+      <xsl:value-of select="$str"/>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:call-template name="space">
+        <xsl:with-param name="repeat" select="$diff"/>
+      </xsl:call-template>
+      <xsl:value-of select="$str"/>
+    </xsl:otherwise>
+  </xsl:choose>
+</xsl:template>
+
+<xsl:template name="rpad">
+  <xsl:param name="str" select="''"/>
+  <xsl:param name="pad" select="0"/>
+  <xsl:variable name="diff" select="$pad - string-length($str)"/>
+  <xsl:choose>
+    <xsl:when test="$diff &lt; 0">
+      <xsl:value-of select="$str"/>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:value-of select="$str"/>
+      <xsl:call-template name="space">
+        <xsl:with-param name="repeat" select="$diff"/>
+      </xsl:call-template>
+    </xsl:otherwise>
+  </xsl:choose>
+</xsl:template>
+
+<xsl:template name="line-wrap">
+  <xsl:param name="line-length"/> <!-- required -->
+  <xsl:param name="first-line-length" select="$line-length"/>
+  <xsl:param name="text"/> <!-- required -->
+  <xsl:choose>
+    <xsl:when test="normalize-space($text) = ''" />
+    <xsl:when test="string-length($text) &lt;= $first-line-length">
+      <xsl:value-of select="concat($text, '&#10;')" />
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:variable name="break-pos">
+        <xsl:call-template name="ws-search">
+          <xsl:with-param name="text" select="$text" />
+          <xsl:with-param name="start" select="$first-line-length+1" />
+        </xsl:call-template>
+      </xsl:variable>
+      <xsl:value-of select="substring($text, 1, $break-pos - 1)" />
+      <xsl:text>&#10;</xsl:text>
+      <xsl:call-template name="line-wrap">
+        <xsl:with-param name="line-length" select="$line-length" />
+        <xsl:with-param
+          name="text" select="concat('    ', substring($text, $break-pos+1))"
+        />
+      </xsl:call-template>
+    </xsl:otherwise>
+  </xsl:choose>
+</xsl:template>
+
+<xsl:template name="ws-search">
+  <xsl:param name="text"/> <!-- required -->
+  <xsl:param name="start"/> <!-- required -->
+  <xsl:variable name="search-text" select="substring($text, $start)" />
+  <xsl:choose>
+    <xsl:when test="not(contains($search-text, ' '))">
+      <xsl:value-of select="string-length($text)+1" />
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:value-of
+        select="$start + string-length(substring-before($search-text, ' '))"
+      />
+    </xsl:otherwise>
+  </xsl:choose>
+</xsl:template>
+
+</xsl:stylesheet>

Engine/bin/bison-flex/data/xslt/xml2xhtml.xsl

@@ -0,0 +1,765 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<!--
+    xml2html.xsl - transform Bison XML Report into XHTML.
+
+    Copyright (C) 2007-2015, 2018-2021 Free Software Foundation, Inc.
+
+    This file is part of Bison, the GNU Compiler Compiler.
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+    Written by Wojciech Polak <polak@gnu.org>.
+  -->
+
+<xsl:stylesheet version="1.0"
+  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+  xmlns="http://www.w3.org/1999/xhtml"
+  xmlns:bison="https://www.gnu.org/software/bison/">
+
+<xsl:import href="bison.xsl"/>
+
+<xsl:output method="xml" encoding="UTF-8"
+            doctype-public="-//W3C//DTD XHTML 1.0 Strict//EN"
+            doctype-system="http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"
+            indent="yes"/>
+
+<xsl:template match="/">
+  <html>
+    <head>
+      <meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>
+      <title>
+        <xsl:value-of select="bison-xml-report/filename"/>
+        <xsl:text> - GNU Bison XML Automaton Report</xsl:text>
+      </title>
+      <style type="text/css"><![CDATA[
+      body {
+        font-family: "Nimbus Sans L", Arial, sans-serif;
+        font-size: 9pt;
+      }
+      a:link {
+        color: #1f00ff;
+        text-decoration: none;
+      }
+      a:visited {
+        color: #1f00ff;
+        text-decoration: none;
+      }
+      a:hover {
+        color: red;
+      }
+      #menu a {
+        text-decoration: underline;
+      }
+      .i {
+        font-style: italic;
+      }
+      .pre {
+        font-family: monospace;
+        white-space: pre;
+      }
+      ol.decimal {
+        list-style-type: decimal;
+      }
+      ol.lower-alpha {
+        list-style-type: lower-alpha;
+      }
+      .dot {
+        color: #cc0000;
+      }
+      #footer {
+        margin-top: 3.5em;
+        font-size: 7pt;
+      }
+      ]]></style>
+    </head>
+    <body>
+      <xsl:apply-templates select="bison-xml-report"/>
+      <xsl:text>&#10;&#10;</xsl:text>
+      <div id="footer"><hr />This document was generated using
+      <a href="https://www.gnu.org/software/bison/" title="GNU Bison">
+      GNU Bison <xsl:value-of select="/bison-xml-report/@version"/></a>
+      XML Automaton Report.<br />
+      <!-- default copying notice -->
+      Verbatim copying and distribution of this entire page is
+      permitted in any medium, provided this notice is preserved.</div>
+    </body>
+  </html>
+</xsl:template>
+
+<xsl:template match="bison-xml-report">
+  <h1>GNU Bison XML Automaton Report</h1>
+  <p>
+    input grammar: <span class="i"><xsl:value-of select="filename"/></span>
+  </p>
+
+  <xsl:text>&#10;&#10;</xsl:text>
+  <h3>Table of Contents</h3>
+  <ul id="menu">
+    <li>
+      <a href="#reductions">Reductions</a>
+      <ul class="lower-alpha">
+        <li><a href="#nonterminals_useless_in_grammar">Nonterminals useless in grammar</a></li>
+        <li><a href="#terminals_unused_in_grammar">Terminals unused in grammar</a></li>
+        <li><a href="#rules_useless_in_grammar">Rules useless in grammar</a></li>
+        <xsl:if test="grammar/rules/rule[@usefulness='useless-in-parser']">
+          <li><a href="#rules_useless_in_parser">Rules useless in parser due to conflicts</a></li>
+        </xsl:if>
+      </ul>
+    </li>
+    <li><a href="#conflicts">Conflicts</a></li>
+    <li>
+      <a href="#grammar">Grammar</a>
+      <ul class="lower-alpha">
+        <li><a href="#grammar">Itemset</a></li>
+        <li><a href="#terminals">Terminal symbols</a></li>
+        <li><a href="#nonterminals">Nonterminal symbols</a></li>
+      </ul>
+    </li>
+    <li><a href="#automaton">Automaton</a></li>
+  </ul>
+  <xsl:apply-templates select="grammar" mode="reductions"/>
+  <xsl:apply-templates select="grammar" mode="useless-in-parser"/>
+  <xsl:apply-templates select="automaton" mode="conflicts"/>
+  <xsl:apply-templates select="grammar"/>
+  <xsl:apply-templates select="automaton"/>
+</xsl:template>
+
+<xsl:template match="grammar" mode="reductions">
+  <h2>
+    <a name="reductions"/>
+    <xsl:text> Reductions</xsl:text>
+  </h2>
+  <xsl:apply-templates select="nonterminals" mode="useless-in-grammar"/>
+  <xsl:apply-templates select="terminals" mode="unused-in-grammar"/>
+  <xsl:apply-templates select="rules" mode="useless-in-grammar"/>
+</xsl:template>
+
+<xsl:template match="nonterminals" mode="useless-in-grammar">
+  <h3>
+    <a name="nonterminals_useless_in_grammar"/>
+    <xsl:text> Nonterminals useless in grammar</xsl:text>
+  </h3>
+  <xsl:text>&#10;&#10;</xsl:text>
+  <xsl:if test="nonterminal[@usefulness='useless-in-grammar']">
+    <p class="pre">
+      <xsl:for-each select="nonterminal[@usefulness='useless-in-grammar']">
+        <xsl:text>   </xsl:text>
+        <xsl:value-of select="@name"/>
+        <xsl:text>&#10;</xsl:text>
+      </xsl:for-each>
+      <xsl:text>&#10;&#10;</xsl:text>
+    </p>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="terminals" mode="unused-in-grammar">
+  <h3>
+    <a name="terminals_unused_in_grammar"/>
+    <xsl:text> Terminals unused in grammar</xsl:text>
+  </h3>
+  <xsl:text>&#10;&#10;</xsl:text>
+  <xsl:if test="terminal[@usefulness='unused-in-grammar']">
+    <p class="pre">
+      <xsl:for-each select="terminal[@usefulness='unused-in-grammar']">
+        <xsl:sort select="@symbol-number" data-type="number"/>
+        <xsl:text>   </xsl:text>
+        <xsl:value-of select="@name"/>
+        <xsl:text>&#10;</xsl:text>
+      </xsl:for-each>
+      <xsl:text>&#10;&#10;</xsl:text>
+    </p>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="rules" mode="useless-in-grammar">
+  <h3>
+    <a name="rules_useless_in_grammar"/>
+    <xsl:text> Rules useless in grammar</xsl:text>
+  </h3>
+  <xsl:text>&#10;</xsl:text>
+  <xsl:variable name="set" select="rule[@usefulness='useless-in-grammar']"/>
+  <xsl:if test="$set">
+    <p class="pre">
+      <xsl:call-template name="style-rule-set">
+        <xsl:with-param name="rule-set" select="$set"/>
+      </xsl:call-template>
+      <xsl:text>&#10;&#10;</xsl:text>
+    </p>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="grammar" mode="useless-in-parser">
+  <xsl:variable
+    name="set" select="rules/rule[@usefulness='useless-in-parser']"
+  />
+  <xsl:if test="$set">
+    <h2>
+      <a name="rules_useless_in_parser"/>
+      <xsl:text> Rules useless in parser due to conflicts</xsl:text>
+    </h2>
+    <xsl:text>&#10;</xsl:text>
+    <p class="pre">
+      <xsl:call-template name="style-rule-set">
+        <xsl:with-param name="rule-set" select="$set"/>
+      </xsl:call-template>
+    </p>
+    <xsl:text>&#10;&#10;</xsl:text>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="grammar">
+  <h2>
+    <a name="grammar"/>
+    <xsl:text> Grammar</xsl:text>
+  </h2>
+  <xsl:text>&#10;</xsl:text>
+  <p class="pre">
+    <xsl:call-template name="style-rule-set">
+      <xsl:with-param name="anchor" select="'true'" />
+      <xsl:with-param
+        name="rule-set" select="rules/rule[@usefulness!='useless-in-grammar']"
+      />
+    </xsl:call-template>
+  </p>
+  <xsl:text>&#10;&#10;</xsl:text>
+  <xsl:apply-templates select="terminals"/>
+  <xsl:apply-templates select="nonterminals"/>
+</xsl:template>
+
+<xsl:template name="style-rule-set">
+  <xsl:param name="anchor"/>
+  <xsl:param name="rule-set"/>
+  <xsl:for-each select="$rule-set">
+    <xsl:apply-templates select=".">
+      <xsl:with-param name="anchor" select="$anchor"/>
+      <xsl:with-param name="pad" select="'3'"/>
+      <xsl:with-param name="prev-lhs">
+        <xsl:if test="position()>1">
+          <xsl:variable name="position" select="position()"/>
+          <xsl:value-of select="$rule-set[$position - 1]/lhs"/>
+        </xsl:if>
+      </xsl:with-param>
+    </xsl:apply-templates>
+  </xsl:for-each>
+</xsl:template>
+
+<xsl:template match="automaton" mode="conflicts">
+  <h2>
+    <a name="conflicts"/>
+    <xsl:text> Conflicts</xsl:text>
+  </h2>
+  <xsl:text>&#10;&#10;</xsl:text>
+  <xsl:variable name="conflict-report">
+    <xsl:apply-templates select="state" mode="conflicts"/>
+  </xsl:variable>
+  <xsl:if test="string-length($conflict-report) != 0">
+    <p class="pre">
+      <xsl:copy-of select="$conflict-report"/>
+      <xsl:text>&#10;&#10;</xsl:text>
+    </p>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="state" mode="conflicts">
+  <xsl:variable name="conflict-counts">
+    <xsl:apply-templates select="." mode="bison:count-conflicts" />
+  </xsl:variable>
+  <xsl:variable
+    name="sr-count" select="substring-before($conflict-counts, ',')"
+  />
+  <xsl:variable
+    name="rr-count" select="substring-after($conflict-counts, ',')"
+  />
+  <xsl:if test="$sr-count > 0 or $rr-count > 0">
+    <a>
+      <xsl:attribute name="href">
+        <xsl:value-of select="concat('#state_', @number)"/>
+      </xsl:attribute>
+      <xsl:value-of select="concat('State ', @number)"/>
+    </a>
+    <xsl:text> conflicts:</xsl:text>
+    <xsl:if test="$sr-count > 0">
+      <xsl:value-of select="concat(' ', $sr-count, ' shift/reduce')"/>
+      <xsl:if test="$rr-count > 0">
+        <xsl:value-of select="(',')"/>
+      </xsl:if>
+    </xsl:if>
+    <xsl:if test="$rr-count > 0">
+      <xsl:value-of select="concat(' ', $rr-count, ' reduce/reduce')"/>
+    </xsl:if>
+    <xsl:value-of select="'&#10;'"/>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="grammar/terminals">
+  <h3>
+    <a name="terminals"/>
+    <xsl:text> Terminals, with rules where they appear</xsl:text>
+  </h3>
+  <xsl:text>&#10;&#10;</xsl:text>
+  <ul>
+    <xsl:text>&#10;</xsl:text>
+    <xsl:apply-templates select="terminal"/>
+  </ul>
+  <xsl:text>&#10;&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template match="grammar/nonterminals">
+  <h3>
+    <a name="nonterminals"/>
+    <xsl:text> Nonterminals, with rules where they appear</xsl:text>
+  </h3>
+  <xsl:text>&#10;&#10;</xsl:text>
+  <ul>
+    <xsl:text>&#10;</xsl:text>
+    <xsl:apply-templates
+      select="nonterminal[@usefulness!='useless-in-grammar']"
+    />
+  </ul>
+</xsl:template>
+
+<xsl:template match="terminal">
+  <xsl:text>  </xsl:text>
+  <li>
+    <b><xsl:value-of select="@name"/></b>
+    <xsl:if test="string-length(@type) != 0">
+      <xsl:value-of select="concat(' &lt;', @type, '&gt;')"/>
+    </xsl:if>
+    <xsl:value-of select="concat(' (', @token-number, ')')"/>
+    <xsl:for-each select="key('bison:ruleByRhs', @name)">
+      <xsl:apply-templates select="." mode="number-link"/>
+    </xsl:for-each>
+  </li>
+  <xsl:text>&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template match="nonterminal">
+  <xsl:text>  </xsl:text>
+  <li>
+    <b><xsl:value-of select="@name"/></b>
+    <xsl:if test="string-length(@type) != 0">
+      <xsl:value-of select="concat(' &lt;', @type, '&gt;')"/>
+    </xsl:if>
+    <xsl:value-of select="concat(' (', @symbol-number, ')')"/>
+    <xsl:text>&#10;    </xsl:text>
+    <ul>
+      <xsl:text>&#10;</xsl:text>
+      <xsl:if test="key('bison:ruleByLhs', @name)">
+        <xsl:text>      </xsl:text>
+        <li>
+          <xsl:text>on left:</xsl:text>
+          <xsl:for-each select="key('bison:ruleByLhs', @name)">
+            <xsl:apply-templates select="." mode="number-link"/>
+          </xsl:for-each>
+        </li>
+        <xsl:text>&#10;</xsl:text>
+      </xsl:if>
+      <xsl:if test="key('bison:ruleByRhs', @name)">
+        <xsl:text>      </xsl:text>
+        <li>
+          <xsl:text>on right:</xsl:text>
+          <xsl:for-each select="key('bison:ruleByRhs', @name)">
+            <xsl:apply-templates select="." mode="number-link"/>
+          </xsl:for-each>
+        </li>
+        <xsl:text>&#10;</xsl:text>
+      </xsl:if>
+    <xsl:text>    </xsl:text>
+    </ul>
+    <xsl:text>&#10;  </xsl:text>
+  </li>
+  <xsl:text>&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template match="rule" mode="number-link">
+  <xsl:text> </xsl:text>
+  <a>
+    <xsl:attribute name="href">
+      <xsl:value-of select="concat('#rule_', @number)"/>
+    </xsl:attribute>
+    <xsl:value-of select="@number"/>
+  </a>
+</xsl:template>
+
+<xsl:template match="automaton">
+  <h2>
+    <a name="automaton"/>
+    <xsl:text> Automaton</xsl:text>
+  </h2>
+  <xsl:apply-templates select="state">
+    <xsl:with-param name="pad" select="'3'"/>
+  </xsl:apply-templates>
+</xsl:template>
+
+<xsl:template match="automaton/state">
+  <xsl:param name="pad"/>
+  <xsl:text>&#10;&#10;</xsl:text>
+  <h3>
+    <a>
+      <xsl:attribute name="name">
+        <xsl:value-of select="concat('state_', @number)"/>
+      </xsl:attribute>
+    </a>
+    <xsl:text>State </xsl:text>
+    <xsl:value-of select="@number"/>
+  </h3>
+  <xsl:text>&#10;&#10;</xsl:text>
+  <p class="pre">
+    <xsl:apply-templates select="itemset/item">
+      <xsl:with-param name="pad" select="$pad"/>
+    </xsl:apply-templates>
+    <xsl:apply-templates select="actions/transitions">
+      <xsl:with-param name="type" select="'shift'"/>
+    </xsl:apply-templates>
+    <xsl:apply-templates select="actions/errors"/>
+    <xsl:apply-templates select="actions/reductions"/>
+    <xsl:apply-templates select="actions/transitions">
+      <xsl:with-param name="type" select="'goto'"/>
+    </xsl:apply-templates>
+    <xsl:apply-templates select="solved-conflicts"/>
+  </p>
+</xsl:template>
+
+<xsl:template match="actions/transitions">
+  <xsl:param name="type"/>
+  <xsl:if test="transition[@type = $type]">
+    <xsl:text>&#10;</xsl:text>
+    <xsl:apply-templates select="transition[@type = $type]">
+      <xsl:with-param name="pad">
+        <xsl:call-template name="max-width-symbol">
+          <xsl:with-param name="node" select="transition[@type = $type]"/>
+        </xsl:call-template>
+      </xsl:with-param>
+    </xsl:apply-templates>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="actions/errors">
+  <xsl:if test="error">
+    <xsl:text>&#10;</xsl:text>
+    <xsl:apply-templates select="error">
+      <xsl:with-param name="pad">
+        <xsl:call-template name="max-width-symbol">
+          <xsl:with-param name="node" select="error"/>
+        </xsl:call-template>
+      </xsl:with-param>
+    </xsl:apply-templates>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="actions/reductions">
+  <xsl:if test="reduction">
+    <xsl:text>&#10;</xsl:text>
+    <xsl:apply-templates select="reduction">
+      <xsl:with-param name="pad">
+        <xsl:call-template name="max-width-symbol">
+          <xsl:with-param name="node" select="reduction"/>
+        </xsl:call-template>
+      </xsl:with-param>
+    </xsl:apply-templates>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="item">
+  <xsl:param name="pad"/>
+  <xsl:param name="prev-rule-number"
+             select="preceding-sibling::item[1]/@rule-number"/>
+  <xsl:apply-templates
+    select="key('bison:ruleByNumber', current()/@rule-number)"
+  >
+    <xsl:with-param name="itemset" select="'true'"/>
+    <xsl:with-param name="pad" select="$pad"/>
+    <xsl:with-param name="prev-lhs"
+      select="key('bison:ruleByNumber', $prev-rule-number)/lhs[text()]"
+   />
+    <xsl:with-param name="dot" select="@dot"/>
+    <xsl:with-param name="lookaheads">
+      <xsl:apply-templates select="lookaheads"/>
+    </xsl:with-param>
+  </xsl:apply-templates>
+</xsl:template>
+
+<!--
+anchor = 'true': define as an <a> anchor.
+itemset = 'true': show the items.
+ -->
+<xsl:template match="rule">
+  <xsl:param name="anchor"/>
+  <xsl:param name="itemset"/>
+  <xsl:param name="pad"/>
+  <xsl:param name="prev-lhs"/>
+  <xsl:param name="dot"/>
+  <xsl:param name="lookaheads"/>
+
+  <xsl:if test="$itemset != 'true' and not($prev-lhs = lhs[text()])">
+    <xsl:text>&#10;</xsl:text>
+  </xsl:if>
+
+  <xsl:text>  </xsl:text>
+
+  <xsl:choose>
+    <xsl:when test="$anchor = 'true'">
+      <a>
+        <xsl:attribute name="name">
+          <xsl:value-of select="concat('rule_', @number)"/>
+        </xsl:attribute>
+        <xsl:call-template name="lpad">
+          <xsl:with-param name="str" select="string(@number)"/>
+          <xsl:with-param name="pad" select="number($pad)"/>
+        </xsl:call-template>
+      </a>
+    </xsl:when>
+    <xsl:otherwise>
+      <a>
+        <xsl:attribute name="href">
+          <xsl:value-of select="concat('#rule_', @number)"/>
+        </xsl:attribute>
+        <xsl:call-template name="lpad">
+          <xsl:with-param name="str" select="string(@number)"/>
+          <xsl:with-param name="pad" select="number($pad)"/>
+        </xsl:call-template>
+      </a>
+    </xsl:otherwise>
+  </xsl:choose>
+  <xsl:text> </xsl:text>
+
+  <!-- LHS -->
+  <xsl:choose>
+    <xsl:when test="$prev-lhs = lhs[text()]">
+      <xsl:call-template name="lpad">
+        <xsl:with-param name="str" select="'|'"/>
+        <xsl:with-param name="pad" select="number(string-length(lhs[text()])) + 2"/>
+      </xsl:call-template>
+    </xsl:when>
+    <xsl:otherwise>
+      <span class="i">
+        <xsl:value-of select="lhs"/>
+      </span>
+      <xsl:text> &#8594;</xsl:text>
+    </xsl:otherwise>
+  </xsl:choose>
+
+  <!-- RHS -->
+  <xsl:for-each select="rhs/*">
+    <xsl:if test="position() = $dot + 1">
+      <xsl:text> </xsl:text>
+      <span class="dot">&#x2022;</span>
+    </xsl:if>
+    <xsl:apply-templates select="."/>
+    <xsl:if test="position() = last() and position() = $dot">
+      <xsl:text> </xsl:text>
+      <span class="dot">&#x2022;</span>
+    </xsl:if>
+  </xsl:for-each>
+  <xsl:if test="$lookaheads">
+    <xsl:value-of select="$lookaheads"/>
+  </xsl:if>
+
+  <xsl:text>&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template match="symbol">
+  <xsl:text> </xsl:text>
+  <xsl:choose>
+    <xsl:when test="name(key('bison:symbolByName', .)) = 'nonterminal'">
+      <span class="i"><xsl:value-of select="."/></span>
+    </xsl:when>
+    <xsl:otherwise>
+      <b><xsl:value-of select="."/></b>
+    </xsl:otherwise>
+  </xsl:choose>
+</xsl:template>
+
+<xsl:template match="empty">
+  <xsl:text> %empty</xsl:text>
+</xsl:template>
+
+<xsl:template match="lookaheads">
+  <xsl:text>  [</xsl:text>
+  <xsl:apply-templates select="symbol"/>
+  <xsl:text>]</xsl:text>
+</xsl:template>
+
+<xsl:template match="lookaheads/symbol">
+  <xsl:value-of select="."/>
+  <xsl:if test="position() != last()">
+    <xsl:text>, </xsl:text>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="transition">
+  <xsl:param name="pad"/>
+  <xsl:text>    </xsl:text>
+  <xsl:call-template name="rpad">
+    <xsl:with-param name="str" select="string(@symbol)"/>
+    <xsl:with-param name="pad" select="number($pad) + 2"/>
+  </xsl:call-template>
+  <xsl:choose>
+    <xsl:when test="@type = 'shift'">
+      <a>
+        <xsl:attribute name="href">
+          <xsl:value-of select="concat('#state_', @state)"/>
+        </xsl:attribute>
+        <xsl:value-of select="concat('shift, and go to state ', @state)"/>
+      </a>
+    </xsl:when>
+    <xsl:when test="@type = 'goto'">
+      <a>
+        <xsl:attribute name="href">
+          <xsl:value-of select="concat('#state_', @state)"/>
+        </xsl:attribute>
+        <xsl:value-of select="concat('go to state ', @state)"/>
+      </a>
+    </xsl:when>
+  </xsl:choose>
+  <xsl:text>&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template match="error">
+  <xsl:param name="pad"/>
+  <xsl:text>    </xsl:text>
+  <xsl:call-template name="rpad">
+    <xsl:with-param name="str" select="string(@symbol)"/>
+    <xsl:with-param name="pad" select="number($pad) + 2"/>
+  </xsl:call-template>
+  <xsl:text>error</xsl:text>
+  <xsl:text> (</xsl:text>
+  <xsl:value-of select="text()"/>
+  <xsl:text>)</xsl:text>
+  <xsl:text>&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template match="reduction">
+  <xsl:param name="pad"/>
+  <xsl:text>    </xsl:text>
+  <xsl:call-template name="rpad">
+    <xsl:with-param name="str" select="string(@symbol)"/>
+    <xsl:with-param name="pad" select="number($pad) + 2"/>
+  </xsl:call-template>
+  <xsl:if test="@enabled = 'false'">
+    <xsl:text>[</xsl:text>
+  </xsl:if>
+  <xsl:choose>
+    <xsl:when test="@rule = 'accept'">
+      <xsl:text>accept</xsl:text>
+    </xsl:when>
+    <xsl:otherwise>
+      <a>
+        <xsl:attribute name="href">
+          <xsl:value-of select="concat('#rule_', @rule)"/>
+        </xsl:attribute>
+        <xsl:value-of select="concat('reduce using rule ', @rule)"/>
+      </a>
+      <xsl:text> (</xsl:text>
+      <xsl:value-of
+        select="key('bison:ruleByNumber', current()/@rule)/lhs[text()]"
+      />
+      <xsl:text>)</xsl:text>
+    </xsl:otherwise>
+  </xsl:choose>
+  <xsl:if test="@enabled = 'false'">
+    <xsl:text>]</xsl:text>
+  </xsl:if>
+  <xsl:text>&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template match="solved-conflicts">
+  <xsl:if test="resolution">
+    <xsl:text>&#10;</xsl:text>
+    <xsl:apply-templates select="resolution"/>
+  </xsl:if>
+</xsl:template>
+
+<xsl:template match="resolution">
+  <xsl:text>    Conflict between </xsl:text>
+  <a>
+    <xsl:attribute name="href">
+      <xsl:value-of select="concat('#rule_', @rule)"/>
+    </xsl:attribute>
+    <xsl:value-of select="concat('rule ',@rule)"/>
+  </a>
+  <xsl:text> and token </xsl:text>
+  <xsl:value-of select="@symbol"/>
+  <xsl:text> resolved as </xsl:text>
+  <xsl:if test="@type = 'error'">
+    <xsl:text>an </xsl:text>
+  </xsl:if>
+  <xsl:value-of select="@type"/>
+  <xsl:text> (</xsl:text>
+  <xsl:value-of select="."/>
+  <xsl:text>).&#10;</xsl:text>
+</xsl:template>
+
+<xsl:template name="max-width-symbol">
+  <xsl:param name="node"/>
+  <xsl:variable name="longest">
+    <xsl:for-each select="$node">
+      <xsl:sort data-type="number" select="string-length(@symbol)"
+                order="descending"/>
+      <xsl:if test="position() = 1">
+        <xsl:value-of select="string-length(@symbol)"/>
+      </xsl:if>
+    </xsl:for-each>
+  </xsl:variable>
+  <xsl:value-of select="$longest"/>
+</xsl:template>
+
+<xsl:template name="lpad">
+  <xsl:param name="str" select="''"/>
+  <xsl:param name="pad" select="0"/>
+  <xsl:variable name="diff" select="$pad - string-length($str)" />
+  <xsl:choose>
+    <xsl:when test="$diff &lt; 0">
+      <xsl:value-of select="$str"/>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:call-template name="space">
+        <xsl:with-param name="repeat" select="$diff"/>
+      </xsl:call-template>
+      <xsl:value-of select="$str"/>
+    </xsl:otherwise>
+  </xsl:choose>
+</xsl:template>
+
+<xsl:template name="rpad">
+  <xsl:param name="str" select="''"/>
+  <xsl:param name="pad" select="0"/>
+  <xsl:variable name="diff" select="$pad - string-length($str)"/>
+  <xsl:choose>
+    <xsl:when test="$diff &lt; 0">
+      <xsl:value-of select="$str"/>
+    </xsl:when>
+    <xsl:otherwise>
+      <xsl:value-of select="$str"/>
+      <xsl:call-template name="space">
+        <xsl:with-param name="repeat" select="$diff"/>
+      </xsl:call-template>
+    </xsl:otherwise>
+  </xsl:choose>
+</xsl:template>
+
+<xsl:template name="space">
+  <xsl:param name="repeat">0</xsl:param>
+  <xsl:param name="fill" select="' '"/>
+  <xsl:if test="number($repeat) &gt;= 1">
+    <xsl:call-template name="space">
+      <xsl:with-param name="repeat" select="$repeat - 1"/>
+      <xsl:with-param name="fill" select="$fill"/>
+    </xsl:call-template>
+    <xsl:value-of select="$fill"/>
+  </xsl:if>
+</xsl:template>
+
+</xsl:stylesheet>

Engine/source/console/torquescript/CMDgram.h

@@ -0,0 +1,170 @@
+/* A Bison parser, made by GNU Bison 3.8.2.  */
+
+/* Bison interface for Yacc-like parsers in C
+
+   Copyright (C) 1984, 1989-1990, 2000-2015, 2018-2021 Free Software Foundation,
+   Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+/* As a special exception, you may create a larger work that contains
+   part or all of the Bison parser skeleton and distribute that work
+   under terms of your choice, so long as that work isn't itself a
+   parser generator using the skeleton or a modified version thereof
+   as a parser skeleton.  Alternatively, if you modify or redistribute
+   the parser skeleton itself, you may (at your option) remove this
+   special exception, which will cause the skeleton and the resulting
+   Bison output files to be licensed under the GNU General Public
+   License without this special exception.
+
+   This special exception was added by the Free Software Foundation in
+   version 2.2 of Bison.  */
+
+/* DO NOT RELY ON FEATURES THAT ARE NOT DOCUMENTED in the manual,
+   especially those whose name start with YY_ or yy_.  They are
+   private implementation details that can be changed or removed.  */
+
+#ifndef YY_CMD_CMDGRAM_H_INCLUDED
+# define YY_CMD_CMDGRAM_H_INCLUDED
+/* Debug traces.  */
+#ifndef YYDEBUG
+# define YYDEBUG 0
+#endif
+#if YYDEBUG
+extern int CMDdebug;
+#endif
+
+/* Token kinds.  */
+#ifndef YYTOKENTYPE
+# define YYTOKENTYPE
+  enum yytokentype
+  {
+    YYEMPTY = -2,
+    YYEOF = 0,                     /* "end of file"  */
+    YYerror = 256,                 /* error  */
+    YYUNDEF = 257,                 /* "invalid token"  */
+    rwDEFINE = 258,                /* rwDEFINE  */
+    rwENDDEF = 259,                /* rwENDDEF  */
+    rwDECLARE = 260,               /* rwDECLARE  */
+    rwDECLARESINGLETON = 261,      /* rwDECLARESINGLETON  */
+    rwBREAK = 262,                 /* rwBREAK  */
+    rwELSE = 263,                  /* rwELSE  */
+    rwCONTINUE = 264,              /* rwCONTINUE  */
+    rwGLOBAL = 265,                /* rwGLOBAL  */
+    rwIF = 266,                    /* rwIF  */
+    rwNIL = 267,                   /* rwNIL  */
+    rwRETURN = 268,                /* rwRETURN  */
+    rwWHILE = 269,                 /* rwWHILE  */
+    rwDO = 270,                    /* rwDO  */
+    rwENDIF = 271,                 /* rwENDIF  */
+    rwENDWHILE = 272,              /* rwENDWHILE  */
+    rwENDFOR = 273,                /* rwENDFOR  */
+    rwDEFAULT = 274,               /* rwDEFAULT  */
+    rwFOR = 275,                   /* rwFOR  */
+    rwFOREACH = 276,               /* rwFOREACH  */
+    rwFOREACHSTR = 277,            /* rwFOREACHSTR  */
+    rwIN = 278,                    /* rwIN  */
+    rwDATABLOCK = 279,             /* rwDATABLOCK  */
+    rwSWITCH = 280,                /* rwSWITCH  */
+    rwCASE = 281,                  /* rwCASE  */
+    rwSWITCHSTR = 282,             /* rwSWITCHSTR  */
+    rwCASEOR = 283,                /* rwCASEOR  */
+    rwPACKAGE = 284,               /* rwPACKAGE  */
+    rwNAMESPACE = 285,             /* rwNAMESPACE  */
+    rwCLASS = 286,                 /* rwCLASS  */
+    rwASSERT = 287,                /* rwASSERT  */
+    ILLEGAL_TOKEN = 288,           /* ILLEGAL_TOKEN  */
+    CHRCONST = 289,                /* CHRCONST  */
+    INTCONST = 290,                /* INTCONST  */
+    TTAG = 291,                    /* TTAG  */
+    VAR = 292,                     /* VAR  */
+    IDENT = 293,                   /* IDENT  */
+    TYPEIDENT = 294,               /* TYPEIDENT  */
+    DOCBLOCK = 295,                /* DOCBLOCK  */
+    STRATOM = 296,                 /* STRATOM  */
+    TAGATOM = 297,                 /* TAGATOM  */
+    FLTCONST = 298,                /* FLTCONST  */
+    opINTNAME = 299,               /* opINTNAME  */
+    opINTNAMER = 300,              /* opINTNAMER  */
+    opMINUSMINUS = 301,            /* opMINUSMINUS  */
+    opPLUSPLUS = 302,              /* opPLUSPLUS  */
+    STMT_SEP = 303,                /* STMT_SEP  */
+    opSHL = 304,                   /* opSHL  */
+    opSHR = 305,                   /* opSHR  */
+    opPLASN = 306,                 /* opPLASN  */
+    opMIASN = 307,                 /* opMIASN  */
+    opMLASN = 308,                 /* opMLASN  */
+    opDVASN = 309,                 /* opDVASN  */
+    opMODASN = 310,                /* opMODASN  */
+    opANDASN = 311,                /* opANDASN  */
+    opXORASN = 312,                /* opXORASN  */
+    opORASN = 313,                 /* opORASN  */
+    opSLASN = 314,                 /* opSLASN  */
+    opSRASN = 315,                 /* opSRASN  */
+    opCAT = 316,                   /* opCAT  */
+    opEQ = 317,                    /* opEQ  */
+    opNE = 318,                    /* opNE  */
+    opGE = 319,                    /* opGE  */
+    opLE = 320,                    /* opLE  */
+    opAND = 321,                   /* opAND  */
+    opOR = 322,                    /* opOR  */
+    opSTREQ = 323,                 /* opSTREQ  */
+    opCOLONCOLON = 324,            /* opCOLONCOLON  */
+    opMDASN = 325,                 /* opMDASN  */
+    opNDASN = 326,                 /* opNDASN  */
+    opNTASN = 327,                 /* opNTASN  */
+    opSTRNE = 328,                 /* opSTRNE  */
+    UNARY = 329                    /* UNARY  */
+  };
+  typedef enum yytokentype yytoken_kind_t;
+#endif
+
+/* Value type.  */
+#if ! defined YYSTYPE && ! defined YYSTYPE_IS_DECLARED
+union YYSTYPE
+{
+#line 82 "CMDgram.y"
+
+   Token< char >           c;
+   Token< int >            i;
+   Token< const char* >    s;
+   Token< char* >          str;
+   Token< double >         f;
+   StmtNode*               stmt;
+   ExprNode*               expr;
+   SlotAssignNode*         slist;
+   VarNode*                var;
+   SlotDecl                slot;
+   InternalSlotDecl        intslot;
+   ObjectBlockDecl         odcl;
+   ObjectDeclNode*         od;
+   AssignDecl              asn;
+   IfStmtNode*             ifnode;
+
+#line 156 "CMDgram.h"
+
+};
+typedef union YYSTYPE YYSTYPE;
+# define YYSTYPE_IS_TRIVIAL 1
+# define YYSTYPE_IS_DECLARED 1
+#endif
+
+
+extern YYSTYPE CMDlval;
+
+
+int CMDparse (void);
+
+
+#endif /* !YY_CMD_CMDGRAM_H_INCLUDED  */

Engine/source/console/torquescript/CMDgram.y

@@ -8,7 +8,7 @@
 #include <stdlib.h>
 #include <stdio.h>
 #include "console/console.h"
-#include "console/compiler.h"
+#include "console/torquescript/compiler.h"
 #include "console/consoleInternal.h"
 #include "core/strings/stringFunctions.h"
 
@@ -166,7 +166,7 @@ decl_list
    :
       { $$ = nil; }
    | decl_list decl
-      { if(!gStatementList) { gStatementList = $2; } else { gStatementList->append($2); } }
+      { if(!Script::gStatementList) { Script::gStatementList = $2; } else { Script::gStatementList->append($2); } }
    ;
 
 decl

Engine/source/console/torquescript/CMDscan.l

@@ -9,7 +9,7 @@
 #include "platform/platform.h"
 #include "core/stringTable.h"
 #include "console/console.h"
-#include "console/compiler.h"
+#include "console/torquescript/compiler.h"
 #include "console/dynamicTypes.h"
 #include "core/strings/stringFunctions.h"
 
@@ -30,7 +30,7 @@ inline Token< T > MakeToken( T value, U32 lineNumber )
    return result;
 }
 
-#include "console/cmdgram.h"
+#include "console/torquescript/CMDgram.h"
 
 // HACK: C++17 and beyond can't use register keyword
 #define register

Engine/source/console/torquescript/astNodes.cpp

@@ -35,7 +35,7 @@ struct Token
    T value;
    S32 lineNumber;
 };
-#include "cmdgram.h"
+#include "CMDgram.h"
 
 namespace Compiler
 {

Engine/source/console/torquescript/bison.bat

@@ -1,6 +1,6 @@
 echo Changing to %4 ...
 cd %4
 echo Generating %2 and %3 with prefix %1.
-..\..\bin\bison\bison.exe -o %2 %3 --defines -p %1
+..\..\..\bin\bison-flex\win_bison.exe -o %2 %3 --defines -p %1 -H
 echo Renaming %2 to %5 .
 move /Y %2 %5

Engine/source/console/torquescript/cmdgram.h

@@ -1,97 +0,0 @@
-#ifndef _CMDGRAM_H_
-#define _CMDGRAM_H_
-
-typedef union {
-   Token< char >           c;
-   Token< int >            i;
-   Token< const char* >    s;
-   Token< char* >          str;
-   Token< double >         f;
-   StmtNode*               stmt;
-   ExprNode*               expr;
-   SlotAssignNode*         slist;
-   VarNode*                var;
-   SlotDecl                slot;
-   InternalSlotDecl        intslot;
-   ObjectBlockDecl         odcl;
-   ObjectDeclNode*         od;
-   AssignDecl              asn;
-   IfStmtNode*             ifnode;
-} YYSTYPE;
-#define	rwDEFINE	258
-#define	rwENDDEF	259
-#define	rwDECLARE	260
-#define	rwDECLARESINGLETON	261
-#define	rwBREAK	262
-#define	rwELSE	263
-#define	rwCONTINUE	264
-#define	rwGLOBAL	265
-#define	rwIF	266
-#define	rwNIL	267
-#define	rwRETURN	268
-#define	rwWHILE	269
-#define	rwDO	270
-#define	rwENDIF	271
-#define	rwENDWHILE	272
-#define	rwENDFOR	273
-#define	rwDEFAULT	274
-#define	rwFOR	275
-#define	rwFOREACH	276
-#define	rwFOREACHSTR	277
-#define	rwIN	278
-#define	rwDATABLOCK	279
-#define	rwSWITCH	280
-#define	rwCASE	281
-#define	rwSWITCHSTR	282
-#define	rwCASEOR	283
-#define	rwPACKAGE	284
-#define	rwNAMESPACE	285
-#define	rwCLASS	286
-#define	rwASSERT	287
-#define	ILLEGAL_TOKEN	288
-#define	CHRCONST	289
-#define	INTCONST	290
-#define	TTAG	291
-#define	VAR	292
-#define	IDENT	293
-#define	TYPEIDENT	294
-#define	DOCBLOCK	295
-#define	STRATOM	296
-#define	TAGATOM	297
-#define	FLTCONST	298
-#define	opINTNAME	299
-#define	opINTNAMER	300
-#define	opMINUSMINUS	301
-#define	opPLUSPLUS	302
-#define	STMT_SEP	303
-#define	opSHL	304
-#define	opSHR	305
-#define	opPLASN	306
-#define	opMIASN	307
-#define	opMLASN	308
-#define	opDVASN	309
-#define	opMODASN	310
-#define	opANDASN	311
-#define	opXORASN	312
-#define	opORASN	313
-#define	opSLASN	314
-#define	opSRASN	315
-#define	opCAT	316
-#define	opEQ	317
-#define	opNE	318
-#define	opGE	319
-#define	opLE	320
-#define	opAND	321
-#define	opOR	322
-#define	opSTREQ	323
-#define	opCOLONCOLON	324
-#define	opMDASN	325
-#define	opNDASN	326
-#define	opNTASN	327
-#define	opSTRNE	328
-#define	UNARY	329
-
-
-extern YYSTYPE CMDlval;
-
-#endif

Engine/source/console/torquescript/generateCompiler.bat

@@ -0,0 +1,3 @@
+
+call bison.bat CMD CMDgram.c CMDgram.y . CMDgram.cpp
+..\..\..\bin\bison-flex\win_flex -PCMD -oCMDscan.cpp CMDscan.l