Revision history for Perl extension Yapp.

	- original version; created by h2xs 1.18

0.01  Thu Jun 25 20:02:09 1998

0.02  Never released

0.03  Never released

0.04  Never released

	- Fix installation of yapp.pl to $INST_SCRIPT

	- $VERSION is now in Yapp/Driver to check compatibility

	- Add debugging driver and debug option

	- Bug in error recovery fixed: do not shift an $error reduction

	- Add LeftValue, Curtok and Curval methods

	- Add driver version compatibility check 

0.05  Thu Jul 03 20:05:05 1998

	- Add LeftValue, Curtok and Curval methods

0.06  Tue Jul 07 20:36:17 GMT 1998

    - Error token '$error' becomes 'error' (like in yacc)

    - The '$end' token becomes ''

0.07  Never released

    - Default action become a separate entry in states hash

    - $COMPATIBLE value changed to 0.08

    - The grammar parser is now a Yapp parser module

    - Comments can be either Perl (#...\n) or C /* ... */ style

    - The parser accepts %type, %union and <type> constructs and

      almost ignore them, except checking consistency between token

      and non-terminal declarations (warnings)

    - The parser now has error recovery and consistent error line numbers

    - The parser now accepts "in rule" actions and generates pseudo

      empty rules to reduce, named @x-y, where x is a sequential

      number and y the 'dot position' in the rule for the driver

      to know how many parameters to pass to semantic action sub

    - Add "in rule" actions handling in Driver.pm

    - Empty rhs need not be the first one anymore

    - Warning if more than one empty rhs for a given lhs

0.08  Fri Jul 10 22:04:31 GMT 1998

    - Changed 'print STDERR' to 'warn' in parser.

    - Use of literal 'error' produces a warning and is treated as

      the error token

    - Add prefix 'YY' before each parser object methods to avoid

      clashes with user written methods

    - Renamed YYUserData to YYData (shorter and more consistent with

      other methods names)

    - Renamed YYLeftVal to YYSemval for same reasons

    - Modified Driver.pm so Semval(-n..n) reacts like $-n..$n in yacc

0.09  Never released

    - Changed test suite to 't/' style and add base tests for semantic

      actions/values and associativity tests

    - Check code to be (almost) Perl's -w compatible

    - Updates to pod section in Yapp.pm reflecting most of those changes

0.10  Mon Jul 13 20:53:40 GMT 1998

    - Cosmetic changes

0.11  Wed Jul 15 19:46:17 GMT 1998

    - Renamed Yapp::Parse parameters with a leading yy

    - Updated Yapp.pm pod section

0.12  Tue Jul 21 22:34:00 GMT 1998

0.13  Never released. (I'm not supersticious, but who knows...8-))

    - Renaming to Parse::Yapp for better CPAN entry...

0.14  Wed Jul 29 21:43:03 GMT 1998

    - Doc change: empty token is '', not undef (perl -w complains otherwise)

    - Bug in _ReduceGrammar: used $ruleno instead of $#{$grammar{RULES}}

      making no-terminal pointing to wrong rhs if useless rules.

0.15  Mon Aug 17 11:39:01 CEST 1998

    - YappParse.yp modified to allow empty tail section (not even \n)

    - YappParse.yp modified to diagnose lack of rules in grammar section

    - Driver.pm has been modified so there is no performance impact at

      loading when debugging is not used and to insure thread safety at

      runtime

    - Output.pm can now include driver code into the parser module to

      make it 'standalone'

    - Copyright notice in Driver has been changed to reflect its use

      if included in a standalone parser

    - A -s option has been added to yapp.pl to generate standalone parsers

    - Usage in yapp.pl reflects this new option 

    - Updated Yapp.pm pod to add Standalone Parsers item

0.16  Sun Oct 25 12:36:05 CET 1998

    - Output.pm modified not to use DATA handle, which seems broken on windows

      systems when Parse::Yapp module is untarred and Output.pm hasn't its \n

      converted to \r\n pairs.

    - Added the %expect declaration, a la bison

    - Updated Yapp.pm pod to reflect this new option

    - The core of Parse::Yapp seems very stable now so I change the status from

      alpha to beta and jump to version 0.20 directly.

0.20  Sun Dec 20 16:13:21 CET 1998

    - Added YYExpect method in Parse/Yapp/Driver.pm

    - Updated Yapp.pm pod to reflect this new method

    - Modified Makefile.PL for using current Parse::Yapp version if recompiling

      Parse/Yapp/Parse.pm from YappParse.yp ( $(PERL) -I. )

    - Modified yapp.pl to add -V option and make output default to final name

      of package, if -m option is specified. Usage updated.

    - Added missing $@ check after eval of debugging driver.

0.21  Thu Dec 24 17:55:47 GMT 1998

    - Corrected a weird bug in Lalr.pm (_SolveConflicts & _SetDefaults) about

      shift/reduce conflicts on non-associative tokens

    - Added a test in base.t to check non-associative conflicts and error

      token handling

    - Added some doc to explain YYExpect can include YYCurtok when non-associ-

      ative errors happen

0.22  Wed Mar 10 17:03:39 CET 1999

    - Moved Parse path tree under lib to be conformant with standard Perl

      modules distributions

    - Added Parse::Yapp::Options class as parent of Parse::Yapp::Grammar

      to handle various options.

    - As the Output method is not really 'public' yet, it now takes its

      arguments as hash list, like YYParse. Can break code of people not

      using the yapp.pl front-end.

      Of course, its arguments are handled by Parse::Yapp::Options

    - Added #line "inputfile" trace in generated grammar by default for input

      source line numbers (obvious reason for adding that :-).

    - Added language, linenumbers, inputfile, classname, standalone and input

      options which default to ( 'Perl', 1, undef, 'Parser', 0, undef )

    - Modified yapp.pl for new parameter list

    - Idem for t/base.t and t/calc.t

    - Modified Grammar.pm so it uses linenumbers option to know it must output

      line numbers and inputfile as the filename. If inputfile is undef, then

      use 'unkown'.

    - Added a new flag -n to yapp.pl to disable line numbers in parser output

    - Renamed yapp.pl to yapp (bored of typing .pl)

    - Wrote pod for yapp frontend (so now there's a man 1 page !)

    - Added article in copyright notice when using the standalone parser option

0.30 Sat Apr  3 15:36:58 CEST 1999

    - Corrected a silly bug in yapp front-end, calling Output method with

      inputfile parameter, which was already done with the constructor

    - Change to yapp frontend so the F<*.output> file goes to the same

      directory than the F<*.yp> source file

    - Corrected Head method in Parse::Yapp::Grammar so it returns '' if there

      is no header code, to avoid a warning with perl's -w switch

    - Same for Tail method, so no line number is output if there is no trailer

      code

    - Corrected a bug in Grammar.pm, to make useful rules useless if their lhs

      are not reachable.

0.31 Fri May  7 21:06:32 CEST 1999

    - Won some milliseconds in Driver.pm by not calling an anonymous sub if

      there is no semantic action: just get the first semantic value as result

    - Added a patch from Andy Wardley (thanks) which allow people to specify

      their own template rather than the standard one from Output.pm

    - Added option C<-b> to yapp to specify a 'shebang'. If value is an empty

      string, $Config{perlpath} is used.

1.00 Wed Oct 20 17:52:38 CEST 1999

    - Corrected a bug in Options.pm to have it run with Perl 5.6.0 

1.01 Tue Mar 28 18:50:19 CEST 2000

    - In YappParse.yp, if declaring a token with %left/%right/%nonassoc and

      later redefining it with token lost precedence/associativity. Now, it

      emits a warning

    - In Lalr.pm, _FirstSfx, incorrectly looped when epsilon was in firstset

      instead of beeing nullable (this one was weird)

    - In Driver.pm, check for a call to YYErrok after calling error routine

      to abort error recovery and continue normal parsing 

    - New method YYLexer added in Driver.pm, to get a reference to the lexer

      routine

    - In Driver.pm, $check variable was not always cleaned up

1.02 Mon May  1 13:42:03 CEST 2000

    - English corrections in README file (thanks to Donald Lancon)

	- New email address

	- Updated copyright boundaries

	- Various cleanups in Grammar.pm and Lalr.pm

1.03 Sun Nov  5 13:14:49 CEST 2000

    - In Lalr.pm, _Preds, recursivity removed

    - English corrections in Parse::Yapp pod section (thanks to Julian Trudy)

	- Updated copyright boundaries

    - Stress test added (compile and check a full C++ grammar)

1.04 Mon Feb 12 16:46:37 CET 2001

    - Bug correction in YappParse.yp _Lexer sub to accept '\\' literals

      (Thanks to Denis Barbier to catch this one)

1.05 Sun Nov  4 20:32:32 CET 2001

1.06 Wed Jun 14 2017

    - First Release In Over 15 Years, 

      How's That For Long-Term Stability?!?  :-)

    - Bug Fix, Unescaped Left Curly Braces { In Regular Expressions,

      Fatal Since Perl v5.25.1, Minor Changes In YappParse.yp & Parse.pm

    - Typo Fixes, POD Spelling & Syntax

    - Copyright Assignment Documents, Desarmenien To Braswell

1.20 Wed Jun 14 2017

    - Bug Fix, CPAN Version Dependencies Failure, 

      Enable Module Version In Parse::Yapp,

      Not Just Distribution Version In Parse::Yapp::Driver

    - Bump Version

1.21 Fri Aug 04 2017

    - Typo Fixes, POD Spelling (thanks to Gregor Herrmann)

    - Bug Fix, Missing POD Encoding (thanks to Gregor Herrmann)