home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Chip 2000 May
/
Chip_2000-05_cd1.bin
/
zkuste
/
Perl
/
ActivePerl-5.6.0.613.msi
/
䆊䌷䈹䈙䏵-䞅䞆䞀㡆䞃䄦䠥
/
_fac03926a0e0460d382d310a03a736e0
< prev
next >
Wrap
Text File
|
2000-03-23
|
18KB
|
386 lines
<HTML>
<HEAD>
<TITLE>Pod::InputObjects - objects representing POD input paragraphs, commands, etc.</TITLE>
<LINK REL="stylesheet" HREF="../../Active.css" TYPE="text/css">
<LINK REV="made" HREF="mailto:">
</HEAD>
<BODY>
<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%>
<TR><TD CLASS=block VALIGN=MIDDLE WIDTH=100% BGCOLOR="#cccccc">
<STRONG><P CLASS=block> Pod::InputObjects - objects representing POD input paragraphs, commands, etc.</P></STRONG>
</TD></TR>
</TABLE>
<A NAME="__index__"></A>
<!-- INDEX BEGIN -->
<UL>
<LI><A HREF="#name">NAME</A></LI><LI><A HREF="#supportedplatforms">SUPPORTED PLATFORMS</A></LI>
<LI><A HREF="#synopsis">SYNOPSIS</A></LI>
<LI><A HREF="#requires">REQUIRES</A></LI>
<LI><A HREF="#exports">EXPORTS</A></LI>
<LI><A HREF="#description">DESCRIPTION</A></LI>
<LI><A HREF="#pod::inputsource"><STRONG>Pod::InputSource</STRONG></A></LI>
<UL>
<LI><A HREF="#new()"><STRONG>new()</STRONG></A></LI>
<LI><A HREF="#name()"><STRONG>name()</STRONG></A></LI>
<LI><A HREF="#handle()"><STRONG>handle()</STRONG></A></LI>
<LI><A HREF="#was_cutting()"><STRONG>was_cutting()</STRONG></A></LI>
</UL>
<LI><A HREF="#pod::paragraph"><STRONG>Pod::Paragraph</STRONG></A></LI>
<UL>
<LI><A HREF="#new()"><STRONG>new()</STRONG></A></LI>
<LI><A HREF="#cmd_name()"><STRONG>cmd_name()</STRONG></A></LI>
<LI><A HREF="#text()"><STRONG>text()</STRONG></A></LI>
<LI><A HREF="#raw_text()"><STRONG>raw_text()</STRONG></A></LI>
<LI><A HREF="#cmd_prefix()"><STRONG>cmd_prefix()</STRONG></A></LI>
<LI><A HREF="#cmd_separator()"><STRONG>cmd_separator()</STRONG></A></LI>
<LI><A HREF="#parse_tree()"><STRONG>parse_tree()</STRONG></A></LI>
<LI><A HREF="#file_line()"><STRONG>file_line()</STRONG></A></LI>
</UL>
<LI><A HREF="#pod::interiorsequence"><STRONG>Pod::InteriorSequence</STRONG></A></LI>
<UL>
<LI><A HREF="#new()"><STRONG>new()</STRONG></A></LI>
<LI><A HREF="#cmd_name()"><STRONG>cmd_name()</STRONG></A></LI>
<LI><A HREF="#prepend()"><STRONG>prepend()</STRONG></A></LI>
<LI><A HREF="#append()"><STRONG>append()</STRONG></A></LI>
<LI><A HREF="#nested()"><STRONG>nested()</STRONG></A></LI>
<LI><A HREF="#raw_text()"><STRONG>raw_text()</STRONG></A></LI>
<LI><A HREF="#left_delimiter()"><STRONG>left_delimiter()</STRONG></A></LI>
<LI><A HREF="#right_delimiter()"><STRONG>right_delimiter()</STRONG></A></LI>
<LI><A HREF="#parse_tree()"><STRONG>parse_tree()</STRONG></A></LI>
<LI><A HREF="#file_line()"><STRONG>file_line()</STRONG></A></LI>
<LI><A HREF="#destroy()"><STRONG>DESTROY()</STRONG></A></LI>
</UL>
<LI><A HREF="#pod::parsetree"><STRONG>Pod::ParseTree</STRONG></A></LI>
<UL>
<LI><A HREF="#new()"><STRONG>new()</STRONG></A></LI>
<LI><A HREF="#top()"><STRONG>top()</STRONG></A></LI>
<LI><A HREF="#children()"><STRONG>children()</STRONG></A></LI>
<LI><A HREF="#prepend()"><STRONG>prepend()</STRONG></A></LI>
<LI><A HREF="#append()"><STRONG>append()</STRONG></A></LI>
<LI><A HREF="#raw_text()"><STRONG>raw_text()</STRONG></A></LI>
<LI><A HREF="#destroy()"><STRONG>DESTROY()</STRONG></A></LI>
</UL>
<LI><A HREF="#see also">SEE ALSO</A></LI>
<LI><A HREF="#author">AUTHOR</A></LI>
</UL>
<!-- INDEX END -->
<HR>
<P>
<H1><A NAME="name">NAME</A></H1>
<P>Pod::InputObjects - objects representing POD input paragraphs, commands, etc.</P>
<P>
<HR>
<H1><A NAME="supportedplatforms">SUPPORTED PLATFORMS</A></H1>
<UL>
<LI>Linux</LI>
<LI>Solaris</LI>
<LI>Windows</LI>
</UL>
<HR>
<H1><A NAME="synopsis">SYNOPSIS</A></H1>
<PRE>
use Pod::InputObjects;</PRE>
<P>
<HR>
<H1><A NAME="requires">REQUIRES</A></H1>
<P>perl5.004, Carp</P>
<P>
<HR>
<H1><A NAME="exports">EXPORTS</A></H1>
<P>Nothing.</P>
<P>
<HR>
<H1><A NAME="description">DESCRIPTION</A></H1>
<P>This module defines some basic input objects used by <STRONG>Pod::Parser</STRONG> when
reading and parsing POD text from an input source. The following objects
are defined:</P>
<DL>
<DT><STRONG><A NAME="item_Pod%3A%3AParagraph"><STRONG>Pod::Paragraph</STRONG></A></STRONG><BR>
<DD>
An object corresponding to a paragraph of POD input text. It may be a
plain paragraph, a verbatim paragraph, or a command paragraph (see
<A HREF="../../lib/Pod/perlpod.html">the perlpod manpage</A>).
<P></P>
<DT><STRONG><A NAME="item_Pod%3A%3AInteriorSequence"><STRONG>Pod::InteriorSequence</STRONG></A></STRONG><BR>
<DD>
An object corresponding to an interior sequence command from the POD
input text (see <A HREF="../../lib/Pod/perlpod.html">the perlpod manpage</A>).
<P></P>
<DT><STRONG><A NAME="item_Pod%3A%3AParseTree"><STRONG>Pod::ParseTree</STRONG></A></STRONG><BR>
<DD>
An object corresponding to a tree of parsed POD text. Each ``node'' in
a parse-tree (or <EM>ptree</EM>) is either a text-string or a reference to
a <STRONG>Pod::InteriorSequence</STRONG> object. The nodes appear in the parse-tree
in they order in which they were parsed from left-to-right.
<P></P></DL>
<P>Each of these input objects are described in further detail in the
sections which follow.</P>
<P>
<HR>
<H1><A NAME="pod::paragraph"><STRONG>Pod::Paragraph</STRONG></A></H1>
<P>An object representing a paragraph of POD input text.
It has the following methods/attributes:</P>
<P>
<H2><A NAME="new()"><STRONG>new()</STRONG></A></H2>
<PRE>
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);</PRE>
<P>This is a class method that constructs a <A HREF="#item_Pod%3A%3AParagraph"><CODE>Pod::Paragraph</CODE></A> object and
returns a reference to the new paragraph object. It may be given one or
two keyword arguments. The <CODE>-text</CODE> keyword indicates the corresponding
text of the POD paragraph. The <CODE>-name</CODE> keyword indicates the name of
the corresponding POD command, such as <CODE>head1</CODE> or <CODE>item</CODE> (it should
<EM>not</EM> contain the <CODE>=</CODE> prefix); this is needed only if the POD
paragraph corresponds to a command paragraph. The <CODE>-file</CODE> and <CODE>-line</CODE>
keywords indicate the filename and line number corresponding to the
beginning of the paragraph</P>
<P>
<H2><A NAME="cmd_name()"><STRONG>cmd_name()</STRONG></A></H2>
<PRE>
my $para_cmd = $pod_para->cmd_name();</PRE>
<P>If this paragraph is a command paragraph, then this method will return
the name of the command (<EM>without</EM> any leading <CODE>=</CODE> prefix).</P>
<P>
<H2><A NAME="text()"><STRONG>text()</STRONG></A></H2>
<PRE>
my $para_text = $pod_para->text();</PRE>
<P>This method will return the corresponding text of the paragraph.</P>
<P>
<H2><A NAME="raw_text()"><STRONG>raw_text()</STRONG></A></H2>
<PRE>
my $raw_pod_para = $pod_para->raw_text();</PRE>
<P>This method will return the <EM>raw</EM> text of the POD paragraph, exactly
as it appeared in the input.</P>
<P>
<H2><A NAME="cmd_prefix()"><STRONG>cmd_prefix()</STRONG></A></H2>
<PRE>
my $prefix = $pod_para->cmd_prefix();</PRE>
<P>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 ``=='').</P>
<P>
<H2><A NAME="cmd_separator()"><STRONG>cmd_separator()</STRONG></A></H2>
<PRE>
my $separator = $pod_para->cmd_separator();</PRE>
<P>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).</P>
<P>
<H2><A NAME="parse_tree()"><STRONG>parse_tree()</STRONG></A></H2>
<PRE>
my $ptree = $pod_parser->parse_text( $pod_para->text() );
$pod_para->parse_tree( $ptree );
$ptree = $pod_para->parse_tree();</PRE>
<P>This method will get/set the corresponding parse-tree of the paragraph's text.</P>
<P>
<H2><A NAME="file_line()"><STRONG>file_line()</STRONG></A></H2>
<PRE>
my ($filename, $line_number) = $pod_para->file_line();
my $position = $pod_para->file_line();</PRE>
<P>Returns the current filename and line number for the paragraph
object. If called in an array 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.</P>
<P>
<HR>
<H1><A NAME="pod::interiorsequence"><STRONG>Pod::InteriorSequence</STRONG></A></H1>
<P>An object representing a POD interior sequence command.
It has the following methods/attributes:</P>
<P>
<H2><A NAME="new()"><STRONG>new()</STRONG></A></H2>
<PRE>
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);</PRE>
<PRE>
my $pod_seq4 = new Pod::InteriorSequence(-name => $cmd, $ptree);
my $pod_seq5 = new Pod::InteriorSequence($cmd, $ptree);</PRE>
<P>This is a class method that constructs a <A HREF="#item_Pod%3A%3AInteriorSequence"><CODE>Pod::InteriorSequence</CODE></A> object
and returns a reference to the new interior sequence object. It should
be given two keyword arguments. The <CODE>-ldelim</CODE> keyword indicates the
corresponding left-delimiter of the interior sequence (e.g. '<').
The <CODE>-name</CODE> keyword indicates the name of the corresponding interior
sequence command, such as <CODE>I</CODE> or <CODE>B</CODE> or <CODE>C</CODE>. The <CODE>-file</CODE> and
<CODE>-line</CODE> keywords indicate the filename and line number corresponding
to the beginning of the interior sequence. If the <CODE>$ptree</CODE> argument is
given, it must be the last argument, and it must be either string, or
else an array-ref suitable for passing to <STRONG>Pod::ParseTree::new</STRONG> (or
it may be a reference to an Pod::ParseTree object).</P>
<P>
<H2><A NAME="cmd_name()"><STRONG>cmd_name()</STRONG></A></H2>
<PRE>
my $seq_cmd = $pod_seq->cmd_name();</PRE>
<P>The name of the interior sequence command.</P>
<P>
<H2><A NAME="prepend()"><STRONG>prepend()</STRONG></A></H2>
<PRE>
$pod_seq->prepend($text);
$pod_seq1->prepend($pod_seq2);</PRE>
<P>Prepends the given string or parse-tree or sequence object to the parse-tree
of this interior sequence.</P>
<P>
<H2><A NAME="append()"><STRONG>append()</STRONG></A></H2>
<PRE>
$pod_seq->append($text);
$pod_seq1->append($pod_seq2);</PRE>
<P>Appends the given string or parse-tree or sequence object to the parse-tree
of this interior sequence.</P>
<P>
<H2><A NAME="nested()"><STRONG>nested()</STRONG></A></H2>
<PRE>
$outer_seq = $pod_seq->nested || print "not nested";</PRE>
<P>If this interior sequence is nested inside of another interior
sequence, then the outer/parent sequence that contains it is
returned. Otherwise <A HREF="../../lib/Pod/perlfunc.html#item_undef"><CODE>undef</CODE></A> is returned.</P>
<P>
<H2><A NAME="raw_text()"><STRONG>raw_text()</STRONG></A></H2>
<PRE>
my $seq_raw_text = $pod_seq->raw_text();</PRE>
<P>This method will return the <EM>raw</EM> text of the POD interior sequence,
exactly as it appeared in the input.</P>
<P>
<H2><A NAME="left_delimiter()"><STRONG>left_delimiter()</STRONG></A></H2>
<PRE>
my $ldelim = $pod_seq->left_delimiter();</PRE>
<P>The leftmost delimiter beginning the argument text to the interior
sequence (should be ``<'').</P>
<P>
<H2><A NAME="right_delimiter()"><STRONG>right_delimiter()</STRONG></A></H2>
<P>The rightmost delimiter beginning the argument text to the interior
sequence (should be ``>'').</P>
<P>
<H2><A NAME="parse_tree()"><STRONG>parse_tree()</STRONG></A></H2>
<PRE>
my $ptree = $pod_parser->parse_text($paragraph_text);
$pod_seq->parse_tree( $ptree );
$ptree = $pod_seq->parse_tree();</PRE>
<P>This method will get/set the corresponding parse-tree of the interior
sequence's text.</P>
<P>
<H2><A NAME="file_line()"><STRONG>file_line()</STRONG></A></H2>
<PRE>
my ($filename, $line_number) = $pod_seq->file_line();
my $position = $pod_seq->file_line();</PRE>
<P>Returns the current filename and line number for the interior sequence
object. If called in an array 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.</P>
<P>
<H2><A NAME="destroy()"><STRONG>DESTROY()</STRONG></A></H2>
<P>This method performs any necessary cleanup for the interior-sequence.
If you override this method then it is <STRONG>imperative</STRONG> that you invoke
the parent method from within your own method, otherwise
<EM>interior-sequence storage will not be reclaimed upon destruction!</EM></P>
<P>
<HR>
<H1><A NAME="pod::parsetree"><STRONG>Pod::ParseTree</STRONG></A></H1>
<P>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 <STRONG>Pod::InteriorSequence</STRONG> objects (in order of
appearance). A <STRONG>Pod::ParseTree</STRONG> 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).</P>
<P>
<H2><A NAME="new()"><STRONG>new()</STRONG></A></H2>
<PRE>
my $ptree1 = Pod::ParseTree->new;
my $ptree2 = new Pod::ParseTree;
my $ptree4 = Pod::ParseTree->new($array_ref);
my $ptree3 = new Pod::ParseTree($array_ref);</PRE>
<P>This is a class method that constructs a <CODE>Pod::Parse_tree</CODE> 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.</P>
<P>
<H2><A NAME="top()"><STRONG>top()</STRONG></A></H2>
<PRE>
my $top_node = $ptree->top();
$ptree->top( $top_node );
$ptree->top( @children );</PRE>
<P>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 <STRONG>Pod::ParseTree</STRONG>. 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.</P>
<P>
<H2><A NAME="children()"><STRONG>children()</STRONG></A></H2>
<P>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 <STRONG>Pod::InteriorSequence</STRONG>.
Otherwise, if arguments are given, they are treated as the new list of
children for the top node.</P>
<P>
<H2><A NAME="prepend()"><STRONG>prepend()</STRONG></A></H2>
<P>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 <EM>before</EM>
the current one.</P>
<P>
<H2><A NAME="append()"><STRONG>append()</STRONG></A></H2>
<P>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 <EM>after</EM>
the current one.</P>
<P>
<H2><A NAME="raw_text()"><STRONG>raw_text()</STRONG></A></H2>
<PRE>
my $ptree_raw_text = $ptree->raw_text();</PRE>
<P>This method will return the <EM>raw</EM> text of the POD parse-tree
exactly as it appeared in the input.</P>
<P>
<H2><A NAME="destroy()"><STRONG>DESTROY()</STRONG></A></H2>
<P>This method performs any necessary cleanup for the parse-tree.
If you override this method then it is <STRONG>imperative</STRONG>
that you invoke the parent method from within your own method,
otherwise <EM>parse-tree storage will not be reclaimed upon destruction!</EM></P>
<P>
<HR>
<H1><A NAME="see also">SEE ALSO</A></H1>
<P>See <A HREF="../../lib/Pod/Parser.html">the Pod::Parser manpage</A>, <A HREF="../../lib/Pod/Select.html">the Pod::Select manpage</A></P>
<P>
<HR>
<H1><A NAME="author">AUTHOR</A></H1>
<P>Brad Appleton <<A HREF="mailto:bradapp@enteract.com">bradapp@enteract.com</A>></P>
<TABLE BORDER=0 CELLPADDING=0 CELLSPACING=0 WIDTH=100%>
<TR><TD CLASS=block VALIGN=MIDDLE WIDTH=100% BGCOLOR="#cccccc">
<STRONG><P CLASS=block> Pod::InputObjects - objects representing POD input paragraphs, commands, etc.</P></STRONG>
</TD></TR>
</TABLE>
</BODY>
</HTML>