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Pod::Simple::PullParser(3perl) Perl Programmers Reference Guide Pod::Simple::PullParser(3perl)
NAME
Pod::Simple::PullParser -- a pull-parser interface to parsing Pod
SYNOPSIS
my $parser = SomePodProcessor->new;
$parser->set_source( "whatever.pod" );
$parser->run;
Or:
my $parser = SomePodProcessor->new;
$parser->set_source( $some_filehandle_object );
$parser->run;
Or:
my $parser = SomePodProcessor->new;
$parser->set_source( \$document_source );
$parser->run;
Or:
my $parser = SomePodProcessor->new;
$parser->set_source( \@document_lines );
$parser->run;
And elsewhere:
require 5;
package SomePodProcessor;
use strict;
use base qw(Pod::Simple::PullParser);
sub run {
my $self = shift;
Token:
while(my $token = $self->get_token) {
...process each token...
}
}
DESCRIPTION
This class is for using Pod::Simple to build a Pod processor -- but one that uses an
interface based on a stream of token objects, instead of based on events.
This is a subclass of Pod::Simple and inherits all its methods.
A subclass of Pod::Simple::PullParser should define a "run" method that calls "$token =
$parser->get_token" to pull tokens.
See the source for Pod::Simple::RTF for an example of a formatter that uses
Pod::Simple::PullParser.
METHODS
my $token = $parser->get_token
This returns the next token object (which will be of a subclass of
Pod::Simple::PullParserToken), or undef if the parser-stream has hit the end of the
document.
$parser->unget_token( $token )
$parser->unget_token( $token1, $token2, ... )
This restores the token object(s) to the front of the parser stream.
The source has to be set before you can parse anything. The lowest-level way is to call
"set_source":
$parser->set_source( $filename )
$parser->set_source( $filehandle_object )
$parser->set_source( \$document_source )
$parser->set_source( \@document_lines )
Or you can call these methods, which Pod::Simple::PullParser has defined to work just like
Pod::Simple's same-named methods:
$parser->parse_file(...)
$parser->parse_string_document(...)
$parser->filter(...)
$parser->parse_from_file(...)
For those to work, the Pod-processing subclass of Pod::Simple::PullParser has to have
defined a $parser->run method -- so it is advised that all Pod::Simple::PullParser
subclasses do so. See the Synopsis above, or the source for Pod::Simple::RTF.
Authors of formatter subclasses might find these methods useful to call on a parser object
that you haven't started pulling tokens from yet:
my $title_string = $parser->get_title
This tries to get the title string out of $parser, by getting some tokens, and
scanning them for the title, and then ungetting them so that you can process the
token-stream from the beginning.
For example, suppose you have a document that starts out:
=head1 NAME
Hoo::Boy::Wowza -- Stuff B<wow> yeah!
$parser->get_title on that document will return "Hoo::Boy::Wowza -- Stuff wow yeah!".
In cases where get_title can't find the title, it will return empty-string ("").
my $title_string = $parser->get_short_title
This is just like get_title, except that it returns just the modulename, if the title
seems to be of the form "SomeModuleName -- description".
For example, suppose you have a document that starts out:
=head1 NAME
Hoo::Boy::Wowza -- Stuff B<wow> yeah!
then $parser->get_short_title on that document will return "Hoo::Boy::Wowza".
But if the document starts out:
=head1 NAME
Hooboy, stuff B<wow> yeah!
then $parser->get_short_title on that document will return "Hooboy, stuff wow yeah!".
If the title can't be found, then get_short_title returns empty-string ("").
$author_name = $parser->get_author
This works like get_title except that it returns the contents of the "=head1
AUTHOR\n\nParagraph...\n" section, assuming that that section isn't terribly long.
(This method tolerates "AUTHORS" instead of "AUTHOR" too.)
$description_name = $parser->get_description
This works like get_title except that it returns the contents of the "=head1
PARAGRAPH\n\nParagraph...\n" section, assuming that that section isn't terribly long.
$version_block = $parser->get_version
This works like get_title except that it returns the contents of the "=head1
VERSION\n\n[BIG BLOCK]\n" block. Note that this does NOT return the module's
$VERSION!!
NOTE
You don't actually have to define a "run" method. If you're writing a Pod-formatter
class, you should define a "run" just so that users can call "parse_file" etc, but you
don't have to.
And if you're not writing a formatter class, but are instead just writing a program that
does something simple with a Pod::PullParser object (and not an object of a subclass),
then there's no reason to bother subclassing to add a "run" method.
SEE ALSO
Pod::Simple
Pod::Simple::PullParserToken -- and its subclasses Pod::Simple::PullParserStartToken,
Pod::Simple::PullParserTextToken, and Pod::Simple::PullParserEndToken.
HTML::TokeParser, which inspired this.
COPYRIGHT AND DISCLAIMERS
Copyright (c) 2002 Sean M. Burke. All rights reserved.
This library is free software; you can redistribute it and/or modify it under the same
terms as Perl itself.
This program is distributed in the hope that it will be useful, but without any warranty;
without even the implied warranty of merchantability or fitness for a particular purpose.
AUTHOR
Sean M. Burke "sburke AT cpan.org"
perl v5.10.0 2011-06-30 Pod::Simple::PullParser(3perl)
Generated by $Id: phpMan.php,v 4.49 2006/02/26 13:18:18 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2012-05-25 01:16 @38.107.179.236 Crawled by CCBot/1.0 (+http://www.commoncrawl.org/bot.html)