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 18:55:47 CET 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
