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Release of version 1.77 of Parse::RecDescent
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NAME
Parse::RecDescent - generate recursive-descent parsers
DESCRIPTION
RecDescent incrementally generates top-down recursive-descent text
parsers from simple yacc-like grammar specifications. It provides:
* Regular expressions or literal strings as terminals (tokens),
* Multiple (non-contiguous) productions for any rule,
* Repeated, optional and alternate subrules within productions,
* Late-bound (run-time dispatched) subrules
* Full access to Perl within actions specified as part of the grammar,
* Simple automated error reporting during parser generation and parsing,
* The ability to commit to, uncommit to, or reject particular
productions during a parse,
* Incremental extension of the parsing grammar (even during a parse),
* Precompilation of parser objects,
* User-definable reduce-reduce conflict resolution via
"scoring" of matching productions.
See the file "RecDescent.pod" for excruciating detail on all of this.
LIMITATIONS
* There's no support for parsing directly from an input stream.
* The generator doesn't handle left-recursion.
PREREQUISITES
Parse::RecDescent requires Text::Balanced, which is included in the
distribution.
INSTALLATION
It's all pure Perl, so just put the .pm files in their appropriate
local Perl subdirectories.
CHANGES AND FUTURE DEVELOPMENT
This readme refers to versions 1.XX.
For details of changes, refer to the file Changes.
Version 2.00 will provide a cleaner interface and better
parsing performance.
AUTHOR
Damian Conway (
[email protected])
COPYRIGHT
Copyright (c) 1997-2000, Damian Conway. All Rights Reserved.
This module is free software. It may be used, redistributed
and/or modified under the terms of the Perl Artistic License
(see
http://www.perl.com/perl/misc/Artistic.html)
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CHANGES IN VERSION 1.77
- IMPORTANT: Now requires 5.005 or better.
- Added <perl_quotelike>, <perl_codeblock>, and <perl_variable>
directives (see documentation)
- Added <autotree> directive (see documentation)
- Added %item hash (see documentation - thanks Stef!)
- Tweaked internal parser in line with changes to Text::Balanced
- Added <nocheck> directive to switch off recursion checking and
other checks in stable grammars (see documentation).
- Refined code generation WRT positional variables ($thisoffset, etc)
- Added positional entries for %item (see documentation)
- Fixed bug with (missing) start actions under precompiler (thanks Theo)
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AVAILABILITY
Parse::RecDescent has been uploaded to the CPAN
and is also available from:
http://www.csse.monash.edu.au/~damian/CPAN/Parse-RecDescent.tar.gz
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