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933 lines
28 KiB
933 lines
28 KiB
#############################################################################
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# Pod/InputObjects.pm -- package which defines objects for input streams
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# and paragraphs and commands when parsing POD docs.
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#
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# Copyright (C) 1996-2000 by Bradford Appleton. All rights reserved.
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# This file is part of "PodParser". PodParser is free software;
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# you can redistribute it and/or modify it under the same terms
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# as Perl itself.
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#############################################################################
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package Pod::InputObjects;
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use vars qw($VERSION);
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$VERSION = 1.13; ## Current version of this package
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require 5.005; ## requires this Perl version or later
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#############################################################################
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=head1 NAME
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Pod::InputObjects - objects representing POD input paragraphs, commands, etc.
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=head1 SYNOPSIS
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use Pod::InputObjects;
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=head1 REQUIRES
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perl5.004, Carp
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=head1 EXPORTS
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Nothing.
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=head1 DESCRIPTION
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This module defines some basic input objects used by B<Pod::Parser> when
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reading and parsing POD text from an input source. The following objects
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are defined:
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=over 4
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=begin __PRIVATE__
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=item package B<Pod::InputSource>
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An object corresponding to a source of POD input text. It is mostly a
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wrapper around a filehandle or C<IO::Handle>-type object (or anything
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that implements the C<getline()> method) which keeps track of some
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additional information relevant to the parsing of PODs.
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=end __PRIVATE__
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=item package B<Pod::Paragraph>
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An object corresponding to a paragraph of POD input text. It may be a
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plain paragraph, a verbatim paragraph, or a command paragraph (see
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L<perlpod>).
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=item package B<Pod::InteriorSequence>
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An object corresponding to an interior sequence command from the POD
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input text (see L<perlpod>).
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=item package B<Pod::ParseTree>
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An object corresponding to a tree of parsed POD text. Each "node" in
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a parse-tree (or I<ptree>) is either a text-string or a reference to
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a B<Pod::InteriorSequence> object. The nodes appear in the parse-tree
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in the order in which they were parsed from left-to-right.
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=back
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Each of these input objects are described in further detail in the
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sections which follow.
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=cut
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#############################################################################
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use strict;
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#use diagnostics;
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#use Carp;
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#############################################################################
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package Pod::InputSource;
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##---------------------------------------------------------------------------
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=begin __PRIVATE__
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=head1 B<Pod::InputSource>
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This object corresponds to an input source or stream of POD
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documentation. When parsing PODs, it is necessary to associate and store
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certain context information with each input source. All of this
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information is kept together with the stream itself in one of these
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C<Pod::InputSource> objects. Each such object is merely a wrapper around
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an C<IO::Handle> object of some kind (or at least something that
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implements the C<getline()> method). They have the following
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methods/attributes:
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=end __PRIVATE__
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=cut
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##---------------------------------------------------------------------------
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=begin __PRIVATE__
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=head2 B<new()>
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my $pod_input1 = Pod::InputSource->new(-handle => $filehandle);
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my $pod_input2 = new Pod::InputSource(-handle => $filehandle,
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-name => $name);
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my $pod_input3 = new Pod::InputSource(-handle => \*STDIN);
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my $pod_input4 = Pod::InputSource->new(-handle => \*STDIN,
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-name => "(STDIN)");
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This is a class method that constructs a C<Pod::InputSource> object and
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returns a reference to the new input source object. It takes one or more
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keyword arguments in the form of a hash. The keyword C<-handle> is
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required and designates the corresponding input handle. The keyword
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C<-name> is optional and specifies the name associated with the input
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handle (typically a file name).
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=end __PRIVATE__
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=cut
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sub new {
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## Determine if we were called via an object-ref or a classname
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my $this = shift;
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my $class = ref($this) || $this;
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## Any remaining arguments are treated as initial values for the
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## hash that is used to represent this object. Note that we default
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## certain values by specifying them *before* the arguments passed.
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## If they are in the argument list, they will override the defaults.
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my $self = { -name => '(unknown)',
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-handle => undef,
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-was_cutting => 0,
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@_ };
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## Bless ourselves into the desired class and perform any initialization
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bless $self, $class;
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return $self;
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}
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##---------------------------------------------------------------------------
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=begin __PRIVATE__
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=head2 B<name()>
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my $filename = $pod_input->name();
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$pod_input->name($new_filename_to_use);
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This method gets/sets the name of the input source (usually a filename).
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If no argument is given, it returns a string containing the name of
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the input source; otherwise it sets the name of the input source to the
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contents of the given argument.
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=end __PRIVATE__
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=cut
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sub name {
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(@_ > 1) and $_[0]->{'-name'} = $_[1];
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return $_[0]->{'-name'};
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}
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## allow 'filename' as an alias for 'name'
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*filename = \&name;
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##---------------------------------------------------------------------------
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=begin __PRIVATE__
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=head2 B<handle()>
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my $handle = $pod_input->handle();
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Returns a reference to the handle object from which input is read (the
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one used to contructed this input source object).
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=end __PRIVATE__
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=cut
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sub handle {
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return $_[0]->{'-handle'};
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}
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##---------------------------------------------------------------------------
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=begin __PRIVATE__
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=head2 B<was_cutting()>
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print "Yes.\n" if ($pod_input->was_cutting());
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The value of the C<cutting> state (that the B<cutting()> method would
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have returned) immediately before any input was read from this input
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stream. After all input from this stream has been read, the C<cutting>
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state is restored to this value.
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=end __PRIVATE__
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=cut
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sub was_cutting {
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(@_ > 1) and $_[0]->{-was_cutting} = $_[1];
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return $_[0]->{-was_cutting};
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}
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##---------------------------------------------------------------------------
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#############################################################################
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package Pod::Paragraph;
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##---------------------------------------------------------------------------
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=head1 B<Pod::Paragraph>
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An object representing a paragraph of POD input text.
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It has the following methods/attributes:
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=cut
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##---------------------------------------------------------------------------
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=head2 Pod::Paragraph-E<gt>B<new()>
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my $pod_para1 = Pod::Paragraph->new(-text => $text);
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my $pod_para2 = Pod::Paragraph->new(-name => $cmd,
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-text => $text);
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my $pod_para3 = new Pod::Paragraph(-text => $text);
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my $pod_para4 = new Pod::Paragraph(-name => $cmd,
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-text => $text);
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my $pod_para5 = Pod::Paragraph->new(-name => $cmd,
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-text => $text,
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-file => $filename,
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-line => $line_number);
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This is a class method that constructs a C<Pod::Paragraph> object and
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returns a reference to the new paragraph object. It may be given one or
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two keyword arguments. The C<-text> keyword indicates the corresponding
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text of the POD paragraph. The C<-name> keyword indicates the name of
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the corresponding POD command, such as C<head1> or C<item> (it should
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I<not> contain the C<=> prefix); this is needed only if the POD
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paragraph corresponds to a command paragraph. The C<-file> and C<-line>
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keywords indicate the filename and line number corresponding to the
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beginning of the paragraph
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=cut
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sub new {
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## Determine if we were called via an object-ref or a classname
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my $this = shift;
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my $class = ref($this) || $this;
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## Any remaining arguments are treated as initial values for the
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## hash that is used to represent this object. Note that we default
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## certain values by specifying them *before* the arguments passed.
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## If they are in the argument list, they will override the defaults.
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my $self = {
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-name => undef,
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-text => (@_ == 1) ? $_[0] : undef,
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-file => '<unknown-file>',
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-line => 0,
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-prefix => '=',
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-separator => ' ',
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-ptree => [],
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@_
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};
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## Bless ourselves into the desired class and perform any initialization
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bless $self, $class;
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return $self;
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}
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##---------------------------------------------------------------------------
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=head2 $pod_para-E<gt>B<cmd_name()>
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my $para_cmd = $pod_para->cmd_name();
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If this paragraph is a command paragraph, then this method will return
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the name of the command (I<without> any leading C<=> prefix).
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=cut
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sub cmd_name {
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(@_ > 1) and $_[0]->{'-name'} = $_[1];
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return $_[0]->{'-name'};
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}
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## let name() be an alias for cmd_name()
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*name = \&cmd_name;
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##---------------------------------------------------------------------------
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=head2 $pod_para-E<gt>B<text()>
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my $para_text = $pod_para->text();
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This method will return the corresponding text of the paragraph.
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=cut
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sub text {
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(@_ > 1) and $_[0]->{'-text'} = $_[1];
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return $_[0]->{'-text'};
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}
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##---------------------------------------------------------------------------
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=head2 $pod_para-E<gt>B<raw_text()>
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my $raw_pod_para = $pod_para->raw_text();
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This method will return the I<raw> text of the POD paragraph, exactly
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as it appeared in the input.
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=cut
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sub raw_text {
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return $_[0]->{'-text'} unless (defined $_[0]->{'-name'});
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return $_[0]->{'-prefix'} . $_[0]->{'-name'} .
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$_[0]->{'-separator'} . $_[0]->{'-text'};
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}
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##---------------------------------------------------------------------------
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=head2 $pod_para-E<gt>B<cmd_prefix()>
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my $prefix = $pod_para->cmd_prefix();
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If this paragraph is a command paragraph, then this method will return
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the prefix used to denote the command (which should be the string "="
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or "==").
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=cut
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sub cmd_prefix {
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return $_[0]->{'-prefix'};
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}
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##---------------------------------------------------------------------------
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=head2 $pod_para-E<gt>B<cmd_separator()>
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my $separator = $pod_para->cmd_separator();
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If this paragraph is a command paragraph, then this method will return
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the text used to separate the command name from the rest of the
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paragraph (if any).
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=cut
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sub cmd_separator {
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return $_[0]->{'-separator'};
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}
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##---------------------------------------------------------------------------
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=head2 $pod_para-E<gt>B<parse_tree()>
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my $ptree = $pod_parser->parse_text( $pod_para->text() );
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$pod_para->parse_tree( $ptree );
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$ptree = $pod_para->parse_tree();
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This method will get/set the corresponding parse-tree of the paragraph's text.
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=cut
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sub parse_tree {
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(@_ > 1) and $_[0]->{'-ptree'} = $_[1];
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return $_[0]->{'-ptree'};
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}
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## let ptree() be an alias for parse_tree()
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*ptree = \&parse_tree;
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##---------------------------------------------------------------------------
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=head2 $pod_para-E<gt>B<file_line()>
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my ($filename, $line_number) = $pod_para->file_line();
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my $position = $pod_para->file_line();
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Returns the current filename and line number for the paragraph
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object. If called in a list context, it returns a list of two
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elements: first the filename, then the line number. If called in
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a scalar context, it returns a string containing the filename, followed
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by a colon (':'), followed by the line number.
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=cut
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sub file_line {
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my @loc = ($_[0]->{'-file'} || '<unknown-file>',
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$_[0]->{'-line'} || 0);
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return (wantarray) ? @loc : join(':', @loc);
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}
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##---------------------------------------------------------------------------
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#############################################################################
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package Pod::InteriorSequence;
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##---------------------------------------------------------------------------
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=head1 B<Pod::InteriorSequence>
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An object representing a POD interior sequence command.
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It has the following methods/attributes:
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=cut
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##---------------------------------------------------------------------------
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=head2 Pod::InteriorSequence-E<gt>B<new()>
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my $pod_seq1 = Pod::InteriorSequence->new(-name => $cmd
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-ldelim => $delimiter);
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my $pod_seq2 = new Pod::InteriorSequence(-name => $cmd,
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-ldelim => $delimiter);
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my $pod_seq3 = new Pod::InteriorSequence(-name => $cmd,
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-ldelim => $delimiter,
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-file => $filename,
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-line => $line_number);
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my $pod_seq4 = new Pod::InteriorSequence(-name => $cmd, $ptree);
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my $pod_seq5 = new Pod::InteriorSequence($cmd, $ptree);
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This is a class method that constructs a C<Pod::InteriorSequence> object
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and returns a reference to the new interior sequence object. It should
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be given two keyword arguments. The C<-ldelim> keyword indicates the
|
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corresponding left-delimiter of the interior sequence (e.g. 'E<lt>').
|
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The C<-name> keyword indicates the name of the corresponding interior
|
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sequence command, such as C<I> or C<B> or C<C>. The C<-file> and
|
|
C<-line> keywords indicate the filename and line number corresponding
|
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to the beginning of the interior sequence. If the C<$ptree> argument is
|
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given, it must be the last argument, and it must be either string, or
|
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else an array-ref suitable for passing to B<Pod::ParseTree::new> (or
|
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it may be a reference to an Pod::ParseTree object).
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=cut
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sub new {
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|
## Determine if we were called via an object-ref or a classname
|
|
my $this = shift;
|
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my $class = ref($this) || $this;
|
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|
|
## See if first argument has no keyword
|
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if (((@_ <= 2) or (@_ % 2)) and $_[0] !~ /^-\w/) {
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## Yup - need an implicit '-name' before first parameter
|
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unshift @_, '-name';
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}
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## See if odd number of args
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if ((@_ % 2) != 0) {
|
|
## Yup - need an implicit '-ptree' before the last parameter
|
|
splice @_, $#_, 0, '-ptree';
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|
}
|
|
|
|
## Any remaining arguments are treated as initial values for the
|
|
## hash that is used to represent this object. Note that we default
|
|
## certain values by specifying them *before* the arguments passed.
|
|
## If they are in the argument list, they will override the defaults.
|
|
my $self = {
|
|
-name => (@_ == 1) ? $_[0] : undef,
|
|
-file => '<unknown-file>',
|
|
-line => 0,
|
|
-ldelim => '<',
|
|
-rdelim => '>',
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|
@_
|
|
};
|
|
|
|
## Initialize contents if they havent been already
|
|
my $ptree = $self->{'-ptree'} || new Pod::ParseTree();
|
|
if ( ref $ptree =~ /^(ARRAY)?$/ ) {
|
|
## We have an array-ref, or a normal scalar. Pass it as an
|
|
## an argument to the ptree-constructor
|
|
$ptree = new Pod::ParseTree($1 ? [$ptree] : $ptree);
|
|
}
|
|
$self->{'-ptree'} = $ptree;
|
|
|
|
## Bless ourselves into the desired class and perform any initialization
|
|
bless $self, $class;
|
|
return $self;
|
|
}
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
=head2 $pod_seq-E<gt>B<cmd_name()>
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|
|
my $seq_cmd = $pod_seq->cmd_name();
|
|
|
|
The name of the interior sequence command.
|
|
|
|
=cut
|
|
|
|
sub cmd_name {
|
|
(@_ > 1) and $_[0]->{'-name'} = $_[1];
|
|
return $_[0]->{'-name'};
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|
}
|
|
|
|
## let name() be an alias for cmd_name()
|
|
*name = \&cmd_name;
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
## Private subroutine to set the parent pointer of all the given
|
|
## children that are interior-sequences to be $self
|
|
|
|
sub _set_child2parent_links {
|
|
my ($self, @children) = @_;
|
|
## Make sure any sequences know who their parent is
|
|
for (@children) {
|
|
next unless (length and ref and ref ne 'SCALAR');
|
|
if (UNIVERSAL::isa($_, 'Pod::InteriorSequence') or
|
|
UNIVERSAL::can($_, 'nested'))
|
|
{
|
|
$_->nested($self);
|
|
}
|
|
}
|
|
}
|
|
|
|
## Private subroutine to unset child->parent links
|
|
|
|
sub _unset_child2parent_links {
|
|
my $self = shift;
|
|
$self->{'-parent_sequence'} = undef;
|
|
my $ptree = $self->{'-ptree'};
|
|
for (@$ptree) {
|
|
next unless (length and ref and ref ne 'SCALAR');
|
|
$_->_unset_child2parent_links()
|
|
if UNIVERSAL::isa($_, 'Pod::InteriorSequence');
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|
}
|
|
}
|
|
|
|
##---------------------------------------------------------------------------
|
|
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|
=head2 $pod_seq-E<gt>B<prepend()>
|
|
|
|
$pod_seq->prepend($text);
|
|
$pod_seq1->prepend($pod_seq2);
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|
|
|
Prepends the given string or parse-tree or sequence object to the parse-tree
|
|
of this interior sequence.
|
|
|
|
=cut
|
|
|
|
sub prepend {
|
|
my $self = shift;
|
|
$self->{'-ptree'}->prepend(@_);
|
|
_set_child2parent_links($self, @_);
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|
return $self;
|
|
}
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
=head2 $pod_seq-E<gt>B<append()>
|
|
|
|
$pod_seq->append($text);
|
|
$pod_seq1->append($pod_seq2);
|
|
|
|
Appends the given string or parse-tree or sequence object to the parse-tree
|
|
of this interior sequence.
|
|
|
|
=cut
|
|
|
|
sub append {
|
|
my $self = shift;
|
|
$self->{'-ptree'}->append(@_);
|
|
_set_child2parent_links($self, @_);
|
|
return $self;
|
|
}
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
=head2 $pod_seq-E<gt>B<nested()>
|
|
|
|
$outer_seq = $pod_seq->nested || print "not nested";
|
|
|
|
If this interior sequence is nested inside of another interior
|
|
sequence, then the outer/parent sequence that contains it is
|
|
returned. Otherwise C<undef> is returned.
|
|
|
|
=cut
|
|
|
|
sub nested {
|
|
my $self = shift;
|
|
(@_ == 1) and $self->{'-parent_sequence'} = shift;
|
|
return $self->{'-parent_sequence'} || undef;
|
|
}
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
=head2 $pod_seq-E<gt>B<raw_text()>
|
|
|
|
my $seq_raw_text = $pod_seq->raw_text();
|
|
|
|
This method will return the I<raw> text of the POD interior sequence,
|
|
exactly as it appeared in the input.
|
|
|
|
=cut
|
|
|
|
sub raw_text {
|
|
my $self = shift;
|
|
my $text = $self->{'-name'} . $self->{'-ldelim'};
|
|
for ( $self->{'-ptree'}->children ) {
|
|
$text .= (ref $_) ? $_->raw_text : $_;
|
|
}
|
|
$text .= $self->{'-rdelim'};
|
|
return $text;
|
|
}
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
=head2 $pod_seq-E<gt>B<left_delimiter()>
|
|
|
|
my $ldelim = $pod_seq->left_delimiter();
|
|
|
|
The leftmost delimiter beginning the argument text to the interior
|
|
sequence (should be "<").
|
|
|
|
=cut
|
|
|
|
sub left_delimiter {
|
|
(@_ > 1) and $_[0]->{'-ldelim'} = $_[1];
|
|
return $_[0]->{'-ldelim'};
|
|
}
|
|
|
|
## let ldelim() be an alias for left_delimiter()
|
|
*ldelim = \&left_delimiter;
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
=head2 $pod_seq-E<gt>B<right_delimiter()>
|
|
|
|
The rightmost delimiter beginning the argument text to the interior
|
|
sequence (should be ">").
|
|
|
|
=cut
|
|
|
|
sub right_delimiter {
|
|
(@_ > 1) and $_[0]->{'-rdelim'} = $_[1];
|
|
return $_[0]->{'-rdelim'};
|
|
}
|
|
|
|
## let rdelim() be an alias for right_delimiter()
|
|
*rdelim = \&right_delimiter;
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
=head2 $pod_seq-E<gt>B<parse_tree()>
|
|
|
|
my $ptree = $pod_parser->parse_text($paragraph_text);
|
|
$pod_seq->parse_tree( $ptree );
|
|
$ptree = $pod_seq->parse_tree();
|
|
|
|
This method will get/set the corresponding parse-tree of the interior
|
|
sequence's text.
|
|
|
|
=cut
|
|
|
|
sub parse_tree {
|
|
(@_ > 1) and $_[0]->{'-ptree'} = $_[1];
|
|
return $_[0]->{'-ptree'};
|
|
}
|
|
|
|
## let ptree() be an alias for parse_tree()
|
|
*ptree = \&parse_tree;
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
=head2 $pod_seq-E<gt>B<file_line()>
|
|
|
|
my ($filename, $line_number) = $pod_seq->file_line();
|
|
my $position = $pod_seq->file_line();
|
|
|
|
Returns the current filename and line number for the interior sequence
|
|
object. If called in a list context, it returns a list of two
|
|
elements: first the filename, then the line number. If called in
|
|
a scalar context, it returns a string containing the filename, followed
|
|
by a colon (':'), followed by the line number.
|
|
|
|
=cut
|
|
|
|
sub file_line {
|
|
my @loc = ($_[0]->{'-file'} || '<unknown-file>',
|
|
$_[0]->{'-line'} || 0);
|
|
return (wantarray) ? @loc : join(':', @loc);
|
|
}
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
=head2 Pod::InteriorSequence::B<DESTROY()>
|
|
|
|
This method performs any necessary cleanup for the interior-sequence.
|
|
If you override this method then it is B<imperative> that you invoke
|
|
the parent method from within your own method, otherwise
|
|
I<interior-sequence storage will not be reclaimed upon destruction!>
|
|
|
|
=cut
|
|
|
|
sub DESTROY {
|
|
## We need to get rid of all child->parent pointers throughout the
|
|
## tree so their reference counts will go to zero and they can be
|
|
## garbage-collected
|
|
_unset_child2parent_links(@_);
|
|
}
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
#############################################################################
|
|
|
|
package Pod::ParseTree;
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
=head1 B<Pod::ParseTree>
|
|
|
|
This object corresponds to a tree of parsed POD text. As POD text is
|
|
scanned from left to right, it is parsed into an ordered list of
|
|
text-strings and B<Pod::InteriorSequence> objects (in order of
|
|
appearance). A B<Pod::ParseTree> object corresponds to this list of
|
|
strings and sequences. Each interior sequence in the parse-tree may
|
|
itself contain a parse-tree (since interior sequences may be nested).
|
|
|
|
=cut
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
=head2 Pod::ParseTree-E<gt>B<new()>
|
|
|
|
my $ptree1 = Pod::ParseTree->new;
|
|
my $ptree2 = new Pod::ParseTree;
|
|
my $ptree4 = Pod::ParseTree->new($array_ref);
|
|
my $ptree3 = new Pod::ParseTree($array_ref);
|
|
|
|
This is a class method that constructs a C<Pod::Parse_tree> object and
|
|
returns a reference to the new parse-tree. If a single-argument is given,
|
|
it must be a reference to an array, and is used to initialize the root
|
|
(top) of the parse tree.
|
|
|
|
=cut
|
|
|
|
sub new {
|
|
## Determine if we were called via an object-ref or a classname
|
|
my $this = shift;
|
|
my $class = ref($this) || $this;
|
|
|
|
my $self = (@_ == 1 and ref $_[0]) ? $_[0] : [];
|
|
|
|
## Bless ourselves into the desired class and perform any initialization
|
|
bless $self, $class;
|
|
return $self;
|
|
}
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
=head2 $ptree-E<gt>B<top()>
|
|
|
|
my $top_node = $ptree->top();
|
|
$ptree->top( $top_node );
|
|
$ptree->top( @children );
|
|
|
|
This method gets/sets the top node of the parse-tree. If no arguments are
|
|
given, it returns the topmost node in the tree (the root), which is also
|
|
a B<Pod::ParseTree>. If it is given a single argument that is a reference,
|
|
then the reference is assumed to a parse-tree and becomes the new top node.
|
|
Otherwise, if arguments are given, they are treated as the new list of
|
|
children for the top node.
|
|
|
|
=cut
|
|
|
|
sub top {
|
|
my $self = shift;
|
|
if (@_ > 0) {
|
|
@{ $self } = (@_ == 1 and ref $_[0]) ? ${ @_ } : @_;
|
|
}
|
|
return $self;
|
|
}
|
|
|
|
## let parse_tree() & ptree() be aliases for the 'top' method
|
|
*parse_tree = *ptree = \⊤
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
=head2 $ptree-E<gt>B<children()>
|
|
|
|
This method gets/sets the children of the top node in the parse-tree.
|
|
If no arguments are given, it returns the list (array) of children
|
|
(each of which should be either a string or a B<Pod::InteriorSequence>.
|
|
Otherwise, if arguments are given, they are treated as the new list of
|
|
children for the top node.
|
|
|
|
=cut
|
|
|
|
sub children {
|
|
my $self = shift;
|
|
if (@_ > 0) {
|
|
@{ $self } = (@_ == 1 and ref $_[0]) ? ${ @_ } : @_;
|
|
}
|
|
return @{ $self };
|
|
}
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
=head2 $ptree-E<gt>B<prepend()>
|
|
|
|
This method prepends the given text or parse-tree to the current parse-tree.
|
|
If the first item on the parse-tree is text and the argument is also text,
|
|
then the text is prepended to the first item (not added as a separate string).
|
|
Otherwise the argument is added as a new string or parse-tree I<before>
|
|
the current one.
|
|
|
|
=cut
|
|
|
|
use vars qw(@ptree); ## an alias used for performance reasons
|
|
|
|
sub prepend {
|
|
my $self = shift;
|
|
local *ptree = $self;
|
|
for (@_) {
|
|
next unless length;
|
|
if (@ptree and !(ref $ptree[0]) and !(ref $_)) {
|
|
$ptree[0] = $_ . $ptree[0];
|
|
}
|
|
else {
|
|
unshift @ptree, $_;
|
|
}
|
|
}
|
|
}
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
=head2 $ptree-E<gt>B<append()>
|
|
|
|
This method appends the given text or parse-tree to the current parse-tree.
|
|
If the last item on the parse-tree is text and the argument is also text,
|
|
then the text is appended to the last item (not added as a separate string).
|
|
Otherwise the argument is added as a new string or parse-tree I<after>
|
|
the current one.
|
|
|
|
=cut
|
|
|
|
sub append {
|
|
my $self = shift;
|
|
local *ptree = $self;
|
|
for (@_) {
|
|
next unless length;
|
|
if (@ptree and !(ref $ptree[-1]) and !(ref $_)) {
|
|
$ptree[-1] .= $_;
|
|
}
|
|
else {
|
|
push @ptree, $_;
|
|
}
|
|
}
|
|
}
|
|
|
|
=head2 $ptree-E<gt>B<raw_text()>
|
|
|
|
my $ptree_raw_text = $ptree->raw_text();
|
|
|
|
This method will return the I<raw> text of the POD parse-tree
|
|
exactly as it appeared in the input.
|
|
|
|
=cut
|
|
|
|
sub raw_text {
|
|
my $self = shift;
|
|
my $text = "";
|
|
for ( @$self ) {
|
|
$text .= (ref $_) ? $_->raw_text : $_;
|
|
}
|
|
return $text;
|
|
}
|
|
|
|
##---------------------------------------------------------------------------
|
|
|
|
## Private routines to set/unset child->parent links
|
|
|
|
sub _unset_child2parent_links {
|
|
my $self = shift;
|
|
local *ptree = $self;
|
|
for (@ptree) {
|
|
next unless (length and ref and ref ne 'SCALAR');
|
|
$_->_unset_child2parent_links()
|
|
if UNIVERSAL::isa($_, 'Pod::InteriorSequence');
|
|
}
|
|
}
|
|
|
|
sub _set_child2parent_links {
|
|
## nothing to do, Pod::ParseTrees cant have parent pointers
|
|
}
|
|
|
|
=head2 Pod::ParseTree::B<DESTROY()>
|
|
|
|
This method performs any necessary cleanup for the parse-tree.
|
|
If you override this method then it is B<imperative>
|
|
that you invoke the parent method from within your own method,
|
|
otherwise I<parse-tree storage will not be reclaimed upon destruction!>
|
|
|
|
=cut
|
|
|
|
sub DESTROY {
|
|
## We need to get rid of all child->parent pointers throughout the
|
|
## tree so their reference counts will go to zero and they can be
|
|
## garbage-collected
|
|
_unset_child2parent_links(@_);
|
|
}
|
|
|
|
#############################################################################
|
|
|
|
=head1 SEE ALSO
|
|
|
|
See L<Pod::Parser>, L<Pod::Select>
|
|
|
|
=head1 AUTHOR
|
|
|
|
Brad Appleton E<lt>[email protected]<gt>
|
|
|
|
=cut
|
|
|
|
1;
|