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Rats! 1.13.3 (Default branch)
05-14-2008
Rats! is a parser generator for C-like languages(though currently it only generates parsers in Java). It has been designed so that grammars are concise and easily extensible. To this end, grammars are organized into modules that can be easily changed by adding, removing, or modifying alternatives in individual productions and composed with each other through module parameters. Furthermore, it relies on ordered choices to avoid ambiguities, supports syntactic predicates for unlimited lookahead, and integrates lexing with parsing. Finally, it has extensive support for automatically generating abstract syntax trees, thus greatly reducing the need for explicit semantic actions.License: GNU General Public License (GPL)Changes:|
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TAP::Parser::Multiplexer(3pm) Perl Programmers Reference Guide TAP::Parser::Multiplexer(3pm) NAME
TAP::Parser::Multiplexer - Multiplex multiple TAP::Parsers VERSION
Version 3.26 SYNOPSIS
use TAP::Parser::Multiplexer; my $mux = TAP::Parser::Multiplexer->new; $mux->add( $parser1, $stash1 ); $mux->add( $parser2, $stash2 ); while ( my ( $parser, $stash, $result ) = $mux->next ) { # do stuff } DESCRIPTION
"TAP::Parser::Multiplexer" gathers input from multiple TAP::Parsers. Internally it calls select on the input file handles for those parsers to wait for one or more of them to have input available. See TAP::Harness for an example of its use. METHODS
Class Methods "new" my $mux = TAP::Parser::Multiplexer->new; Returns a new "TAP::Parser::Multiplexer" object. Instance Methods "add" $mux->add( $parser, $stash ); Add a TAP::Parser to the multiplexer. $stash is an optional opaque reference that will be returned from "next" along with the parser and the next result. "parsers" my $count = $mux->parsers; Returns the number of parsers. Parsers are removed from the multiplexer when their input is exhausted. "next" Return a result from the next available parser. Returns a list containing the parser from which the result came, the stash that corresponds with that parser and the result. my ( $parser, $stash, $result ) = $mux->next; If $result is undefined the corresponding parser has reached the end of its input (and will automatically be removed from the multiplexer). When all parsers are exhausted an empty list will be returned. if ( my ( $parser, $stash, $result ) = $mux->next ) { if ( ! defined $result ) { # End of this parser } else { # Process result } } else { # All parsers finished } See Also TAP::Parser TAP::Harness perl v5.18.2 2014-01-06 TAP::Parser::Multiplexer(3pm)