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Release of version 1.61 of Parse::RecDescent
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DESCRIPTION
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),
* The ability to retrieve the generated parsing code.
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 an optional parser compiler to generate
separate parsing modules with no construction run-time overhead.
AUTHOR
Damian Conway (
[email protected])
COPYRIGHT
Copyright (c) 1997-1998, 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 1.61
- Added <token:...> directive for supporting (future) token-stream
parsing (see pod)
- Added feature that data is consumed if passed as a reference
(see pod)
- Fixed bug in autogenerated errors: now ignores directives
- Modified behaviour of <defer> directive so that deferred
actions only executed if total parse succeeds (i.e. returns
a defined value)
- Made error messages "anti-deferred". That is, only those
errors invoked in paths that eventually caused a parse
to fail are printed - see documentation.
- Miscellaneous fixes for Text::Balanced subroutines
- Made private namespaces inherit Parse::RecDescent namespace
(leads to more intuitive behaviour when calling methods
of $thisparser)
- *** NON-BACKWARDS COMPATIBLE CHANGE! ***
Changed the behaviour of token separator specification.
Now uses <skip:...> directive. See pod for new details.
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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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