NAME

Parse::LexEvent - Generator of event-oriented lexical analyzers (1.00 alpha)

SYNOPSIS

use Parse::LexEvent;

sub string {
  print $_[0]->name, ": $_[1]\n";
}
sub comment {
  print $_[0]->name, ": $_[1]\n";
}
sub remainder {
  print $_[0]->name, ": $_[1]\n";
}

$lexer = Parse::LexEvent->new()->configure(
     From => \*DATA,
     Tokens =>
       [
        Type => 'Simple', Name => 'ccomment', Handler => 'comment',
             Regex => '//.*\n',
        Type => 'Delimited', Name => 'comment', Handler => 'comment',
             Start => '/[*]', End => '[*]/',
        Type => 'Quoted', Name => 'squotes', Handler => 'string', Quote => qq!\'!,
        Type => 'Quoted', Name => 'dquotes', Handler => 'string', Quote => qq!\"!,
        Type => 'Simple', Name => 'remainder',
             Regex => '(?s:[^/\'\"]+)', ReadMore => 1,
       ]
    )->parse();
__END__
/*
  C comment
*/
// C++ comment
var d = "string in double quotes";
var s = 'string in single quotes';
var i = 10;
var y = 100;

DESCRIPTION

Parse::LexEvent generates lexical analyzers in the fashion of Parse::Lex, but the generated analyzers emit an event at the finish of recognition of each token. This event corresponds to the call of a procedure whose name is that of the token. It is possible to give a different name to this procedure by making use of the Handler parameter when defining a token.

An application using Parse::LexEvent must define the required procedures. These procedures take the token object as first argument and the recognized character string as the second.

Parse::LexEvent inherits from Parse::ALex and possesses all the methods described in the documentation of the Parse::Lex class, except for the methods analyze(), every() next(), and nextis().

Methods

parse()

This method runs the analysis of data specified by from().

EXAMPLES

cparser.pl - This analyzer recognizes three types of structures: C ou C++ comments, strings within quotation marks, and the rest. It emits an event specific to each. You can use it, for example, to analyze C, C++ or Javascript programs.

SEE ALSO

Parse::Lex, Parse::Token.

AUTHOR

Philippe Verdret.

COPYRIGHT

Copyright (c) 1999 Philippe Verdret. All rights reserved. This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.