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Pod::InputObjects(3)	       User Contributed Perl Documentation	     Pod::InputObjects(3)

NAME
       Pod::InputObjects - objects representing POD input paragraphs, commands, etc.

SYNOPSIS
	   use Pod::InputObjects;

REQUIRES
       perl5.004, Carp

EXPORTS
       Nothing.

DESCRIPTION
       This module defines some basic input objects used by Pod::Parser when reading and parsing
       POD text from an input source. The following objects are defined:

       package Pod::Paragraph
	   An object corresponding to a paragraph of POD input text. It may be a plain paragraph,
	   a verbatim paragraph, or a command paragraph (see perlpod).

       package Pod::InteriorSequence
	   An object corresponding to an interior sequence command from the POD input text (see
	   perlpod).

       package Pod::ParseTree
	   An object corresponding to a tree of parsed POD text. Each "node" in a parse-tree (or
	   ptree) is either a text-string or a reference to a Pod::InteriorSequence object. The
	   nodes appear in the parse-tree in the order in which they were parsed from left-to-
	   right.

       Each of these input objects are described in further detail in the sections which follow.

Pod::Paragraph
       An object representing a paragraph of POD input text.  It has the following
       methods/attributes:

   Pod::Paragraph->new()
	       my $pod_para1 = Pod::Paragraph->new(-text => $text);
	       my $pod_para2 = Pod::Paragraph->new(-name => $cmd,
						   -text => $text);
	       my $pod_para3 = new Pod::Paragraph(-text => $text);
	       my $pod_para4 = new Pod::Paragraph(-name => $cmd,
						  -text => $text);
	       my $pod_para5 = Pod::Paragraph->new(-name => $cmd,
						   -text => $text,
						   -file => $filename,
						   -line => $line_number);

       This is a class method that constructs a "Pod::Paragraph" object and returns a reference
       to the new paragraph object. It may be given one or two keyword arguments. The "-text"
       keyword indicates the corresponding text of the POD paragraph. The "-name" keyword
       indicates the name of the corresponding POD command, such as "head1" or "item" (it should
       not contain the "=" prefix); this is needed only if the POD paragraph corresponds to a
       command paragraph. The "-file" and "-line" keywords indicate the filename and line number
       corresponding to the beginning of the paragraph

   $pod_para->cmd_name()
	       my $para_cmd = $pod_para->cmd_name();

       If this paragraph is a command paragraph, then this method will return the name of the
       command (without any leading "=" prefix).

   $pod_para->text()
	       my $para_text = $pod_para->text();

       This method will return the corresponding text of the paragraph.

   $pod_para->raw_text()
	       my $raw_pod_para = $pod_para->raw_text();

       This method will return the raw text of the POD paragraph, exactly as it appeared in the
       input.

   $pod_para->cmd_prefix()
	       my $prefix = $pod_para->cmd_prefix();

       If this paragraph is a command paragraph, then this method will return the prefix used to
       denote the command (which should be the string "=" or "==").

   $pod_para->cmd_separator()
	       my $separator = $pod_para->cmd_separator();

       If this paragraph is a command paragraph, then this method will return the text used to
       separate the command name from the rest of the paragraph (if any).

   $pod_para->parse_tree()
	       my $ptree = $pod_parser->parse_text( $pod_para->text() );
	       $pod_para->parse_tree( $ptree );
	       $ptree = $pod_para->parse_tree();

       This method will get/set the corresponding parse-tree of the paragraph's text.

   $pod_para->file_line()
	       my ($filename, $line_number) = $pod_para->file_line();
	       my $position = $pod_para->file_line();

       Returns the current filename and line number for the paragraph 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.

Pod::InteriorSequence
       An object representing a POD interior sequence command.	It has the following
       methods/attributes:

   Pod::InteriorSequence->new()
	       my $pod_seq1 = Pod::InteriorSequence->new(-name => $cmd
							 -ldelim => $delimiter);
	       my $pod_seq2 = new Pod::InteriorSequence(-name => $cmd,
							-ldelim => $delimiter);
	       my $pod_seq3 = new Pod::InteriorSequence(-name => $cmd,
							-ldelim => $delimiter,
							-file => $filename,
							-line => $line_number);

	       my $pod_seq4 = new Pod::InteriorSequence(-name => $cmd, $ptree);
	       my $pod_seq5 = new Pod::InteriorSequence($cmd, $ptree);

       This is a class method that constructs a "Pod::InteriorSequence" object and returns a
       reference to the new interior sequence object. It should be given two keyword arguments.
       The "-ldelim" keyword indicates the corresponding left-delimiter of the interior sequence
       (e.g. '<').  The "-name" keyword indicates the name of the corresponding interior sequence
       command, such as "I" or "B" or "C". The "-file" and "-line" keywords indicate the filename
       and line number corresponding to the beginning of the interior sequence. If the $ptree
       argument is given, it must be the last argument, and it must be either string, or else an
       array-ref suitable for passing to Pod::ParseTree::new (or it may be a reference to a
       Pod::ParseTree object).

   $pod_seq->cmd_name()
	       my $seq_cmd = $pod_seq->cmd_name();

       The name of the interior sequence command.

   $pod_seq->prepend()
	       $pod_seq->prepend($text);
	       $pod_seq1->prepend($pod_seq2);

       Prepends the given string or parse-tree or sequence object to the parse-tree of this
       interior sequence.

   $pod_seq->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.

   $pod_seq->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 "undef" is returned.

   $pod_seq->raw_text()
	       my $seq_raw_text = $pod_seq->raw_text();

       This method will return the raw text of the POD interior sequence, exactly as it appeared
       in the input.

   $pod_seq->left_delimiter()
	       my $ldelim = $pod_seq->left_delimiter();

       The leftmost delimiter beginning the argument text to the interior sequence (should be
       "<").

   $pod_seq->right_delimiter()
       The rightmost delimiter beginning the argument text to the interior sequence (should be
       ">").

   $pod_seq->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.

   $pod_seq->file_line()
	       my ($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.

   Pod::InteriorSequence::DESTROY()
       This method performs any necessary cleanup for the interior-sequence.  If you override
       this method then it is imperative that you invoke the parent method from within your own
       method, otherwise interior-sequence storage will not be reclaimed upon destruction!

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 Pod::InteriorSequence objects
       (in order of appearance). A 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).

   Pod::ParseTree->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 "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.

   $ptree->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 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.

   $ptree->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 Pod::InteriorSequence.  Otherwise, if arguments are given, they are treated as the new
       list of children for the top node.

   $ptree->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 before the current one.

   $ptree->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 after the current one.

   $ptree->raw_text()
	       my $ptree_raw_text = $ptree->raw_text();

       This method will return the raw text of the POD parse-tree exactly as it appeared in the
       input.

   Pod::ParseTree::DESTROY()
       This method performs any necessary cleanup for the parse-tree.  If you override this
       method then it is imperative that you invoke the parent method from within your own
       method, otherwise parse-tree storage will not be reclaimed upon destruction!

SEE ALSO
       Pod::InputObjects is part of the Pod::Parser distribution.

       See Pod::Parser, Pod::Select

AUTHOR
       Please report bugs using <http://rt.cpan.org>.

       Brad Appleton <bradapp@enteract.com>

perl v5.16.3				    2013-06-01			     Pod::InputObjects(3)
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