1Parse::LexEvent(3)    User Contributed Perl Documentation   Parse::LexEvent(3)
2
3
4

NAME

6       "Parse::LexEvent" - Generator of event-oriented lexical analyzers (1.00
7       ALPHA)
8

SYNOPSIS

10         use Parse::LexEvent;
11
12         sub string {
13           print $_[0]->name, ": $_[1]\n";
14         }
15         sub comment {
16           print $_[0]->name, ": $_[1]\n";
17         }
18         sub remainder {
19           print $_[0]->name, ": $_[1]\n";
20         }
21
22         $lexer = Parse::LexEvent->new()->configure(
23              From => \*DATA,
24              Tokens =>
25                [
26                 Type => 'Simple', Name => 'ccomment', Handler => 'comment',
27                      Regex => '//.*\n',
28                 Type => 'Delimited', Name => 'comment', Handler => 'comment',
29                      Start => '/[*]', End => '[*]/',
30                 Type => 'Quoted', Name => 'squotes', Handler => 'string', Quote => qq!\'!,
31                 Type => 'Quoted', Name => 'dquotes', Handler => 'string', Quote => qq!\"!,
32                 Type => 'Simple', Name => 'remainder',
33                      Regex => '(?s:[^/\'\"]+)', ReadMore => 1,
34                ]
35             )->parse();
36         __END__
37         /*
38           C comment
39         */
40         // C++ comment
41         var d = "string in double quotes";
42         var s = 'string in single quotes';
43         var i = 10;
44         var y = 100;
45

DESCRIPTION

47       "Parse::LexEvent" generates lexical analyzers in the fashion of
48       "Parse::Lex", but the generated analyzers emit an event at the finish
49       of recognition of each token.  This event corresponds to the call of a
50       procedure whose name is that of the token.  It is possible to give a
51       different name to this procedure by making use of the "Handler"
52       parameter when defining a token.
53
54       An application using "Parse::LexEvent" must define the required
55       procedures.  These procedures take the token object as first argument
56       and the recognized character string as the second.
57
58       "Parse::LexEvent" inherits from "Parse::ALex" and possesses all the
59       methods described in the documentation of the "Parse::Lex" class,
60       except for the methods "analyze()", "every()" "next()", and "nextis()".
61
62   Methods
63       parse()
64           This method runs the analysis of data specified by "from()".
65

EXAMPLES

67       cparser.pl - This analyzer recognizes three types of structures: C ou
68       C++ comments, strings within quotation marks, and the rest.  It emits
69       an event specific to each.  You can use it, for example, to analyze C,
70       C++ or Javascript programs.
71

SEE ALSO

73       "Parse::Lex", "Parse::Token".
74

AUTHOR

76       Philippe Verdret.
77

79       Copyright (c) 1999 Philippe Verdret. All rights reserved.  This module
80       is free software; you can redistribute it and/or modify it under the
81       same terms as Perl itself.
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85perl v5.34.0                      2022-01-21                Parse::LexEvent(3)
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