1HTML::PullParser(3)   User Contributed Perl Documentation  HTML::PullParser(3)
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NAME

6       HTML::PullParser - Alternative HTML::Parser interface
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SYNOPSIS

9        use HTML::PullParser;
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11        $p = HTML::PullParser->new(file => "index.html",
12                                   start => 'event, tagname, @attr',
13                                   end   => 'event, tagname',
14                                   ignore_elements => [qw(script style)],
15                                  ) || die "Can't open: $!";
16        while (my $token = $p->get_token) {
17            #...do something with $token
18        }
19

DESCRIPTION

21       The HTML::PullParser is an alternative interface to the HTML::Parser
22       class.  It basically turns the HTML::Parser inside out.  You associate
23       a file (or any IO::Handle object or string) with the parser at
24       construction time and then repeatedly call $parser->get_token to obtain
25       the tags and text found in the parsed document.
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27       The following methods are provided:
28
29       $p = HTML::PullParser->new( file => $file, %options )
30       $p = HTML::PullParser->new( doc => \$doc, %options )
31           A "HTML::PullParser" can be made to parse from either a file or a
32           literal document based on whether the "file" or "doc" option is
33           passed to the parser's constructor.
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35           The "file" passed in can either be a file name or a file handle
36           object.  If a file name is passed, and it can't be opened for
37           reading, then the constructor will return an undefined value and $!
38           will tell you why it failed.  Otherwise the argument is taken to be
39           some object that the "HTML::PullParser" can read() from when it
40           needs more data.  The stream will be read() until EOF, but not
41           closed.
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43           A "doc" can be passed plain or as a reference to a scalar.  If a
44           reference is passed then the value of this scalar should not be
45           changed before all tokens have been extracted.
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47           Next the information to be returned for the different token types
48           must be set up.  This is done by simply associating an argspec (as
49           defined in HTML::Parser) with the events you have an interest in.
50           For instance, if you want "start" tokens to be reported as the
51           string 'S' followed by the tagname and the attributes you might
52           pass an "start"-option like this:
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54              $p = HTML::PullParser->new(
55                     doc   => $document_to_parse,
56                     start => '"S", tagname, @attr',
57                     end   => '"E", tagname',
58                   );
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60           At last other "HTML::Parser" options, like "ignore_tags", and
61           "unbroken_text", can be passed in.  Note that you should not use
62           the event_h options to set up parser handlers.  That would confuse
63           the inner logic of "HTML::PullParser".
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65       $token = $p->get_token
66           This method will return the next token found in the HTML document,
67           or "undef" at the end of the document.  The token is returned as an
68           array reference.  The content of this array match the argspec set
69           up during "HTML::PullParser" construction.
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71       $p->unget_token( @tokens )
72           If you find out you have read too many tokens you can push them
73           back, so that they are returned again the next time $p->get_token
74           is called.
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EXAMPLES

77       The 'eg/hform' script shows how we might parse the form section of
78       HTML::Documents using HTML::PullParser.
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SEE ALSO

81       HTML::Parser, HTML::TokeParser
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84       Copyright 1998-2001 Gisle Aas.
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86       This library is free software; you can redistribute it and/or modify it
87       under the same terms as Perl itself.
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91perl v5.32.0                      2020-09-10               HTML::PullParser(3)
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