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-associative 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 '\\' litterals (Thanks to Denis Barbier to catch this one) 1.05 Sun Nov 4 20:32:32 CET 2001