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RedHat 9 (Linux i386) - man page for pod::inputobjects (redhat section 3pm)

Pod::InputObjects(3pm)			   Perl Programmers Reference Guide		       Pod::InputObjects(3pm)

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 para- graph, 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 com- mand 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 cor- responding 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 pass- ing 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::Parse- Tree 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 sepa- rate 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 sepa- rate 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 impera- tive that you invoke the parent method from within your own method, otherwise parse-tree storage will not be reclaimed upon destruction!
SEE ALSO
See Pod::Parser, Pod::Select
AUTHOR
Brad Appleton <bradapp@enteract.com> perl v5.8.0 2002-06-01 Pod::InputObjects(3pm)


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