NAME¶
HTML::PullParser - Alternative HTML::Parser interface
SYNOPSIS¶
use HTML::PullParser;
$p = HTML::PullParser->new(file => "index.html",
start => 'event, tagname, @attr',
end => 'event, tagname',
ignore_elements => [qw(script style)],
) || die "Can't open: $!";
while (my $token = $p->get_token) {
#...do something with $token
}
DESCRIPTION¶
The HTML::PullParser is an alternative interface to the HTML::Parser class. It
basically turns the HTML::Parser inside out. You associate a file (or any
IO::Handle object or string) with the parser at construction time and then
repeatedly call $parser->get_token to obtain the tags and text found in the
parsed document.
The following methods are provided:
- $p = HTML::PullParser->new( file => $file, %options
)
- $p = HTML::PullParser->new( doc => \$doc, %options
)
- A "HTML::PullParser" can be made to parse from
either a file or a literal document based on whether the "file"
or "doc" option is passed to the parser's constructor.
The "file" passed in can either be a file name or a file handle
object. If a file name is passed, and it can't be opened for reading, then
the constructor will return an undefined value and $! will tell you why it
failed. Otherwise the argument is taken to be some object that the
"HTML::PullParser" can read() from when it needs more
data. The stream will be read() until EOF, but not closed.
A "doc" can be passed plain or as a reference to a scalar. If a
reference is passed then the value of this scalar should not be changed
before all tokens have been extracted.
Next the information to be returned for the different token types must be
set up. This is done by simply associating an argspec (as defined in
HTML::Parser) with the events you have an interest in. For instance, if
you want "start" tokens to be reported as the string 'S'
followed by the tagname and the attributes you might pass an
"start"-option like this:
$p = HTML::PullParser->new(
doc => $document_to_parse,
start => '"S", tagname, @attr',
end => '"E", tagname',
);
At last other "HTML::Parser" options, like
"ignore_tags", and "unbroken_text", can be passed in.
Note that you should not use the event_h options to set up parser
handlers. That would confuse the inner logic of
"HTML::PullParser".
- $token = $p->get_token
- This method will return the next token found in the
HTML document, or "undef" at the end of the document. The token
is returned as an array reference. The content of this array match the
argspec set up during "HTML::PullParser" construction.
- $p->unget_token( @tokens )
- If you find out you have read too many tokens you can push
them back, so that they are returned again the next time $p->get_token
is called.
EXAMPLES¶
The 'eg/hform' script shows how we might parse the form section of
HTML::Documents using HTML::PullParser.
SEE ALSO¶
HTML::Parser, HTML::TokeParser
COPYRIGHT¶
Copyright 1998-2001 Gisle Aas.
This library is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.