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Pod::Simple::PullParser(3pm)



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!". If the document starts with:

             =head1 Name

             Hoo::Boy::W00t -- Stuff B<w00t> yeah!

           Then you'll need to pass the "nocase" option in order to recognize
           "Name":

             $parser->get_title(nocase => 1);

           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 document starts with:

             =head1 Name

             Hoo::Boy::W00t -- Stuff B<w00t> yeah!

           Then you'll need to pass the "nocase" option in order to recognize
           "Name":

             $parser->get_short_title(nocase => 1);

           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. To recognize a "=head1
           Author\n\nParagraph\n" section, pass the "nocase" option:

             $parser->get_author(nocase => 1);

           (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 DESCRIPTION\n\nParagraph...\n" section, assuming that
           that section isn't terribly long. To recognize a "=head1
           Description\n\nParagraph\n" section, pass the "nocase" option:

             $parser->get_description(nocase => 1);

       $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!! To recognize a "=head1
           Version\n\n[BIG BLOCK]\n" section, pass the "nocase" option:

             $parser->get_version(nocase => 1);


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(3)

       Pod::Simple::PullParserToken(3) -- and its subclasses
       Pod::Simple::PullParserStartToken(3),
       Pod::Simple::PullParserTextToken(3),
       and Pod::Simple::PullParserEndToken(3).

       HTML::TokeParser(3), which inspired this.


SUPPORT

       Questions or discussion about POD and Pod::Simple should be sent to the
       pod-people@perl.org mail list. Send an empty email to
       pod-people-subscribe@perl.org to subscribe.

       This module is managed in an open GitHub repository,
       <https://github.com/perl-pod/pod-simple/>. Feel free to fork and
       contribute, or to clone <git://github.com/perl-pod/pod-simple.git> and
       send patches!

       Patches against Pod::Simple are welcome. Please send bug reports to
       <bug-pod-simple@rt.cpan.org>.


COPYRIGHT AND DISCLAIMERS

       Copyright (c) 2002 Sean M. Burke.

       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

       Pod::Simple was created by Sean M. Burke <sburke@cpan.org>.  But don't
       bother him, he's retired.

       Pod::Simple is maintained by:

       o   Allison Randal "allison@perl.org"

       o   Hans Dieter Pearcey "hdp@cpan.org"

       o   David E. Wheeler "dwheeler@cpan.org"



perl v5.24.0                      2016-03-01      Pod::Simple::PullParser(3pm)

perl 5.24 - Generated Sun Nov 20 13:17:40 CST 2016
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