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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 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.
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