Pod::InputObjectsPerl Programmers Reference Pod::InputObjects(3p)NAMEPod::InputObjects - objects representing POD input para-
graphs, 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:
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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 para-
graph. 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 para-
graph.
$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 = $pod_para->cmd_prefix();
If this paragraph is a command paragraph, then this method
will return the prefix used to denote the command (which
should be the string "=" or "==").
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$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 para-
graph 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.
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'<'). 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 inte-
rior 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();
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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 inte-
rior 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);
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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. Other-
wise, 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();
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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
Please report bugs using <http://rt.cpan.org>.
Brad Appleton <bradapp@enteract.com>
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