Pod::Simple::PullParserPerl Programmers Reference GuPod::Simple::PullParser(3)NAMEPod::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@cpan.org"
perl v5.10.1 2009-02-12 Pod::Simple::PullParser(3)
