Parse::LexEvent(3) User Contributed Perl Documentation Parse::LexEvent(3)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.
perl v5.14.0 2010-03-26 Parse::LexEvent(3)
