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129 | .\" ======================================================================== | |
130 | .\" | |
131 | .IX Title "Pod::InputObjects 3" | |
132 | .TH Pod::InputObjects 3 "2001-09-21" "perl v5.8.8" "Perl Programmers Reference Guide" | |
133 | .SH "NAME" | |
134 | Pod::InputObjects \- objects representing POD input paragraphs, commands, etc. | |
135 | .SH "SYNOPSIS" | |
136 | .IX Header "SYNOPSIS" | |
137 | .Vb 1 | |
138 | \& use Pod::InputObjects; | |
139 | .Ve | |
140 | .SH "REQUIRES" | |
141 | .IX Header "REQUIRES" | |
142 | perl5.004, Carp | |
143 | .SH "EXPORTS" | |
144 | .IX Header "EXPORTS" | |
145 | Nothing. | |
146 | .SH "DESCRIPTION" | |
147 | .IX Header "DESCRIPTION" | |
148 | This module defines some basic input objects used by \fBPod::Parser\fR when | |
149 | reading and parsing \s-1POD\s0 text from an input source. The following objects | |
150 | are defined: | |
151 | .IP "package \fBPod::Paragraph\fR" 4 | |
152 | .IX Item "package Pod::Paragraph" | |
153 | An object corresponding to a paragraph of \s-1POD\s0 input text. It may be a | |
154 | plain paragraph, a verbatim paragraph, or a command paragraph (see | |
155 | perlpod). | |
156 | .IP "package \fBPod::InteriorSequence\fR" 4 | |
157 | .IX Item "package Pod::InteriorSequence" | |
158 | An object corresponding to an interior sequence command from the \s-1POD\s0 | |
159 | input text (see perlpod). | |
160 | .IP "package \fBPod::ParseTree\fR" 4 | |
161 | .IX Item "package Pod::ParseTree" | |
162 | An object corresponding to a tree of parsed \s-1POD\s0 text. Each \*(L"node\*(R" in | |
163 | a parse-tree (or \fIptree\fR) is either a text-string or a reference to | |
164 | a \fBPod::InteriorSequence\fR object. The nodes appear in the parse-tree | |
165 | in the order in which they were parsed from left\-to\-right. | |
166 | .PP | |
167 | Each of these input objects are described in further detail in the | |
168 | sections which follow. | |
169 | .SH "\fBPod::Paragraph\fP" | |
170 | .IX Header "Pod::Paragraph" | |
171 | An object representing a paragraph of \s-1POD\s0 input text. | |
172 | It has the following methods/attributes: | |
173 | .Sh "Pod::Paragraph\->\fB\fP\f(BInew()\fP\fB\fP" | |
174 | .IX Subsection "Pod::Paragraph->new()" | |
175 | .Vb 10 | |
176 | \& my $pod_para1 = Pod::Paragraph->new(-text => $text); | |
177 | \& my $pod_para2 = Pod::Paragraph->new(-name => $cmd, | |
178 | \& -text => $text); | |
179 | \& my $pod_para3 = new Pod::Paragraph(-text => $text); | |
180 | \& my $pod_para4 = new Pod::Paragraph(-name => $cmd, | |
181 | \& -text => $text); | |
182 | \& my $pod_para5 = Pod::Paragraph->new(-name => $cmd, | |
183 | \& -text => $text, | |
184 | \& -file => $filename, | |
185 | \& -line => $line_number); | |
186 | .Ve | |
187 | .PP | |
188 | This is a class method that constructs a \f(CW\*(C`Pod::Paragraph\*(C'\fR object and | |
189 | returns a reference to the new paragraph object. It may be given one or | |
190 | two keyword arguments. The \f(CW\*(C`\-text\*(C'\fR keyword indicates the corresponding | |
191 | text of the \s-1POD\s0 paragraph. The \f(CW\*(C`\-name\*(C'\fR keyword indicates the name of | |
192 | the corresponding \s-1POD\s0 command, such as \f(CW\*(C`head1\*(C'\fR or \f(CW\*(C`item\*(C'\fR (it should | |
193 | \&\fInot\fR contain the \f(CW\*(C`=\*(C'\fR prefix); this is needed only if the \s-1POD\s0 | |
194 | paragraph corresponds to a command paragraph. The \f(CW\*(C`\-file\*(C'\fR and \f(CW\*(C`\-line\*(C'\fR | |
195 | keywords indicate the filename and line number corresponding to the | |
196 | beginning of the paragraph | |
197 | .Sh "$pod_para\->\fB\fP\f(BIcmd_name()\fP\fB\fP" | |
198 | .IX Subsection "$pod_para->cmd_name()" | |
199 | .Vb 1 | |
200 | \& my $para_cmd = $pod_para->cmd_name(); | |
201 | .Ve | |
202 | .PP | |
203 | If this paragraph is a command paragraph, then this method will return | |
204 | the name of the command (\fIwithout\fR any leading \f(CW\*(C`=\*(C'\fR prefix). | |
205 | .Sh "$pod_para\->\fB\fP\f(BItext()\fP\fB\fP" | |
206 | .IX Subsection "$pod_para->text()" | |
207 | .Vb 1 | |
208 | \& my $para_text = $pod_para->text(); | |
209 | .Ve | |
210 | .PP | |
211 | This method will return the corresponding text of the paragraph. | |
212 | .Sh "$pod_para\->\fB\fP\f(BIraw_text()\fP\fB\fP" | |
213 | .IX Subsection "$pod_para->raw_text()" | |
214 | .Vb 1 | |
215 | \& my $raw_pod_para = $pod_para->raw_text(); | |
216 | .Ve | |
217 | .PP | |
218 | This method will return the \fIraw\fR text of the \s-1POD\s0 paragraph, exactly | |
219 | as it appeared in the input. | |
220 | .Sh "$pod_para\->\fB\fP\f(BIcmd_prefix()\fP\fB\fP" | |
221 | .IX Subsection "$pod_para->cmd_prefix()" | |
222 | .Vb 1 | |
223 | \& my $prefix = $pod_para->cmd_prefix(); | |
224 | .Ve | |
225 | .PP | |
226 | If this paragraph is a command paragraph, then this method will return | |
227 | the prefix used to denote the command (which should be the string \*(L"=\*(R" | |
228 | or \*(L"==\*(R"). | |
229 | .Sh "$pod_para\->\fB\fP\f(BIcmd_separator()\fP\fB\fP" | |
230 | .IX Subsection "$pod_para->cmd_separator()" | |
231 | .Vb 1 | |
232 | \& my $separator = $pod_para->cmd_separator(); | |
233 | .Ve | |
234 | .PP | |
235 | If this paragraph is a command paragraph, then this method will return | |
236 | the text used to separate the command name from the rest of the | |
237 | paragraph (if any). | |
238 | .Sh "$pod_para\->\fB\fP\f(BIparse_tree()\fP\fB\fP" | |
239 | .IX Subsection "$pod_para->parse_tree()" | |
240 | .Vb 3 | |
241 | \& my $ptree = $pod_parser->parse_text( $pod_para->text() ); | |
242 | \& $pod_para->parse_tree( $ptree ); | |
243 | \& $ptree = $pod_para->parse_tree(); | |
244 | .Ve | |
245 | .PP | |
246 | This method will get/set the corresponding parse-tree of the paragraph's text. | |
247 | .Sh "$pod_para\->\fB\fP\f(BIfile_line()\fP\fB\fP" | |
248 | .IX Subsection "$pod_para->file_line()" | |
249 | .Vb 2 | |
250 | \& my ($filename, $line_number) = $pod_para->file_line(); | |
251 | \& my $position = $pod_para->file_line(); | |
252 | .Ve | |
253 | .PP | |
254 | Returns the current filename and line number for the paragraph | |
255 | object. If called in a list context, it returns a list of two | |
256 | elements: first the filename, then the line number. If called in | |
257 | a scalar context, it returns a string containing the filename, followed | |
258 | by a colon (':'), followed by the line number. | |
259 | .SH "\fBPod::InteriorSequence\fP" | |
260 | .IX Header "Pod::InteriorSequence" | |
261 | An object representing a \s-1POD\s0 interior sequence command. | |
262 | It has the following methods/attributes: | |
263 | .Sh "Pod::InteriorSequence\->\fB\fP\f(BInew()\fP\fB\fP" | |
264 | .IX Subsection "Pod::InteriorSequence->new()" | |
265 | .Vb 8 | |
266 | \& my $pod_seq1 = Pod::InteriorSequence->new(-name => $cmd | |
267 | \& -ldelim => $delimiter); | |
268 | \& my $pod_seq2 = new Pod::InteriorSequence(-name => $cmd, | |
269 | \& -ldelim => $delimiter); | |
270 | \& my $pod_seq3 = new Pod::InteriorSequence(-name => $cmd, | |
271 | \& -ldelim => $delimiter, | |
272 | \& -file => $filename, | |
273 | \& -line => $line_number); | |
274 | .Ve | |
275 | .PP | |
276 | .Vb 2 | |
277 | \& my $pod_seq4 = new Pod::InteriorSequence(-name => $cmd, $ptree); | |
278 | \& my $pod_seq5 = new Pod::InteriorSequence($cmd, $ptree); | |
279 | .Ve | |
280 | .PP | |
281 | This is a class method that constructs a \f(CW\*(C`Pod::InteriorSequence\*(C'\fR object | |
282 | and returns a reference to the new interior sequence object. It should | |
283 | be given two keyword arguments. The \f(CW\*(C`\-ldelim\*(C'\fR keyword indicates the | |
284 | corresponding left-delimiter of the interior sequence (e.g. '<'). | |
285 | The \f(CW\*(C`\-name\*(C'\fR keyword indicates the name of the corresponding interior | |
286 | sequence command, such as \f(CW\*(C`I\*(C'\fR or \f(CW\*(C`B\*(C'\fR or \f(CW\*(C`C\*(C'\fR. The \f(CW\*(C`\-file\*(C'\fR and | |
287 | \&\f(CW\*(C`\-line\*(C'\fR keywords indicate the filename and line number corresponding | |
288 | to the beginning of the interior sequence. If the \f(CW$ptree\fR argument is | |
289 | given, it must be the last argument, and it must be either string, or | |
290 | else an array-ref suitable for passing to \fBPod::ParseTree::new\fR (or | |
291 | it may be a reference to a Pod::ParseTree object). | |
292 | .Sh "$pod_seq\->\fB\fP\f(BIcmd_name()\fP\fB\fP" | |
293 | .IX Subsection "$pod_seq->cmd_name()" | |
294 | .Vb 1 | |
295 | \& my $seq_cmd = $pod_seq->cmd_name(); | |
296 | .Ve | |
297 | .PP | |
298 | The name of the interior sequence command. | |
299 | .Sh "$pod_seq\->\fB\fP\f(BIprepend()\fP\fB\fP" | |
300 | .IX Subsection "$pod_seq->prepend()" | |
301 | .Vb 2 | |
302 | \& $pod_seq->prepend($text); | |
303 | \& $pod_seq1->prepend($pod_seq2); | |
304 | .Ve | |
305 | .PP | |
306 | Prepends the given string or parse-tree or sequence object to the parse-tree | |
307 | of this interior sequence. | |
308 | .Sh "$pod_seq\->\fB\fP\f(BIappend()\fP\fB\fP" | |
309 | .IX Subsection "$pod_seq->append()" | |
310 | .Vb 2 | |
311 | \& $pod_seq->append($text); | |
312 | \& $pod_seq1->append($pod_seq2); | |
313 | .Ve | |
314 | .PP | |
315 | Appends the given string or parse-tree or sequence object to the parse-tree | |
316 | of this interior sequence. | |
317 | .Sh "$pod_seq\->\fB\fP\f(BInested()\fP\fB\fP" | |
318 | .IX Subsection "$pod_seq->nested()" | |
319 | .Vb 1 | |
320 | \& $outer_seq = $pod_seq->nested || print "not nested"; | |
321 | .Ve | |
322 | .PP | |
323 | If this interior sequence is nested inside of another interior | |
324 | sequence, then the outer/parent sequence that contains it is | |
325 | returned. Otherwise \f(CW\*(C`undef\*(C'\fR is returned. | |
326 | .Sh "$pod_seq\->\fB\fP\f(BIraw_text()\fP\fB\fP" | |
327 | .IX Subsection "$pod_seq->raw_text()" | |
328 | .Vb 1 | |
329 | \& my $seq_raw_text = $pod_seq->raw_text(); | |
330 | .Ve | |
331 | .PP | |
332 | This method will return the \fIraw\fR text of the \s-1POD\s0 interior sequence, | |
333 | exactly as it appeared in the input. | |
334 | .Sh "$pod_seq\->\fB\fP\f(BIleft_delimiter()\fP\fB\fP" | |
335 | .IX Subsection "$pod_seq->left_delimiter()" | |
336 | .Vb 1 | |
337 | \& my $ldelim = $pod_seq->left_delimiter(); | |
338 | .Ve | |
339 | .PP | |
340 | The leftmost delimiter beginning the argument text to the interior | |
341 | sequence (should be \*(L"<\*(R"). | |
342 | .Sh "$pod_seq\->\fB\fP\f(BIright_delimiter()\fP\fB\fP" | |
343 | .IX Subsection "$pod_seq->right_delimiter()" | |
344 | The rightmost delimiter beginning the argument text to the interior | |
345 | sequence (should be \*(L">\*(R"). | |
346 | .Sh "$pod_seq\->\fB\fP\f(BIparse_tree()\fP\fB\fP" | |
347 | .IX Subsection "$pod_seq->parse_tree()" | |
348 | .Vb 3 | |
349 | \& my $ptree = $pod_parser->parse_text($paragraph_text); | |
350 | \& $pod_seq->parse_tree( $ptree ); | |
351 | \& $ptree = $pod_seq->parse_tree(); | |
352 | .Ve | |
353 | .PP | |
354 | This method will get/set the corresponding parse-tree of the interior | |
355 | sequence's text. | |
356 | .Sh "$pod_seq\->\fB\fP\f(BIfile_line()\fP\fB\fP" | |
357 | .IX Subsection "$pod_seq->file_line()" | |
358 | .Vb 2 | |
359 | \& my ($filename, $line_number) = $pod_seq->file_line(); | |
360 | \& my $position = $pod_seq->file_line(); | |
361 | .Ve | |
362 | .PP | |
363 | Returns the current filename and line number for the interior sequence | |
364 | object. If called in a list context, it returns a list of two | |
365 | elements: first the filename, then the line number. If called in | |
366 | a scalar context, it returns a string containing the filename, followed | |
367 | by a colon (':'), followed by the line number. | |
368 | .Sh "Pod::InteriorSequence::\fB\s-1\fP\f(BIDESTROY\s0()\fP\fB\fP" | |
369 | .IX Subsection "Pod::InteriorSequence::DESTROY()" | |
370 | This method performs any necessary cleanup for the interior\-sequence. | |
371 | If you override this method then it is \fBimperative\fR that you invoke | |
372 | the parent method from within your own method, otherwise | |
373 | \&\fIinterior-sequence storage will not be reclaimed upon destruction!\fR | |
374 | .SH "\fBPod::ParseTree\fP" | |
375 | .IX Header "Pod::ParseTree" | |
376 | This object corresponds to a tree of parsed \s-1POD\s0 text. As \s-1POD\s0 text is | |
377 | scanned from left to right, it is parsed into an ordered list of | |
378 | text-strings and \fBPod::InteriorSequence\fR objects (in order of | |
379 | appearance). A \fBPod::ParseTree\fR object corresponds to this list of | |
380 | strings and sequences. Each interior sequence in the parse-tree may | |
381 | itself contain a parse-tree (since interior sequences may be nested). | |
382 | .Sh "Pod::ParseTree\->\fB\fP\f(BInew()\fP\fB\fP" | |
383 | .IX Subsection "Pod::ParseTree->new()" | |
384 | .Vb 4 | |
385 | \& my $ptree1 = Pod::ParseTree->new; | |
386 | \& my $ptree2 = new Pod::ParseTree; | |
387 | \& my $ptree4 = Pod::ParseTree->new($array_ref); | |
388 | \& my $ptree3 = new Pod::ParseTree($array_ref); | |
389 | .Ve | |
390 | .PP | |
391 | This is a class method that constructs a \f(CW\*(C`Pod::Parse_tree\*(C'\fR object and | |
392 | returns a reference to the new parse\-tree. If a single-argument is given, | |
393 | it must be a reference to an array, and is used to initialize the root | |
394 | (top) of the parse tree. | |
395 | .Sh "$ptree\->\fB\fP\f(BItop()\fP\fB\fP" | |
396 | .IX Subsection "$ptree->top()" | |
397 | .Vb 3 | |
398 | \& my $top_node = $ptree->top(); | |
399 | \& $ptree->top( $top_node ); | |
400 | \& $ptree->top( @children ); | |
401 | .Ve | |
402 | .PP | |
403 | This method gets/sets the top node of the parse\-tree. If no arguments are | |
404 | given, it returns the topmost node in the tree (the root), which is also | |
405 | a \fBPod::ParseTree\fR. If it is given a single argument that is a reference, | |
406 | then the reference is assumed to a parse-tree and becomes the new top node. | |
407 | Otherwise, if arguments are given, they are treated as the new list of | |
408 | children for the top node. | |
409 | .Sh "$ptree\->\fB\fP\f(BIchildren()\fP\fB\fP" | |
410 | .IX Subsection "$ptree->children()" | |
411 | This method gets/sets the children of the top node in the parse\-tree. | |
412 | If no arguments are given, it returns the list (array) of children | |
413 | (each of which should be either a string or a \fBPod::InteriorSequence\fR. | |
414 | Otherwise, if arguments are given, they are treated as the new list of | |
415 | children for the top node. | |
416 | .Sh "$ptree\->\fB\fP\f(BIprepend()\fP\fB\fP" | |
417 | .IX Subsection "$ptree->prepend()" | |
418 | This method prepends the given text or parse-tree to the current parse\-tree. | |
419 | If the first item on the parse-tree is text and the argument is also text, | |
420 | then the text is prepended to the first item (not added as a separate string). | |
421 | Otherwise the argument is added as a new string or parse-tree \fIbefore\fR | |
422 | the current one. | |
423 | .Sh "$ptree\->\fB\fP\f(BIappend()\fP\fB\fP" | |
424 | .IX Subsection "$ptree->append()" | |
425 | This method appends the given text or parse-tree to the current parse\-tree. | |
426 | If the last item on the parse-tree is text and the argument is also text, | |
427 | then the text is appended to the last item (not added as a separate string). | |
428 | Otherwise the argument is added as a new string or parse-tree \fIafter\fR | |
429 | the current one. | |
430 | .Sh "$ptree\->\fB\fP\f(BIraw_text()\fP\fB\fP" | |
431 | .IX Subsection "$ptree->raw_text()" | |
432 | .Vb 1 | |
433 | \& my $ptree_raw_text = $ptree->raw_text(); | |
434 | .Ve | |
435 | .PP | |
436 | This method will return the \fIraw\fR text of the \s-1POD\s0 parse-tree | |
437 | exactly as it appeared in the input. | |
438 | .Sh "Pod::ParseTree::\fB\s-1\fP\f(BIDESTROY\s0()\fP\fB\fP" | |
439 | .IX Subsection "Pod::ParseTree::DESTROY()" | |
440 | This method performs any necessary cleanup for the parse\-tree. | |
441 | If you override this method then it is \fBimperative\fR | |
442 | that you invoke the parent method from within your own method, | |
443 | otherwise \fIparse-tree storage will not be reclaimed upon destruction!\fR | |
444 | .SH "SEE ALSO" | |
445 | .IX Header "SEE ALSO" | |
446 | See Pod::Parser, Pod::Select | |
447 | .SH "AUTHOR" | |
448 | .IX Header "AUTHOR" | |
449 | Please report bugs using <http://rt.cpan.org>. | |
450 | .PP | |
451 | Brad Appleton <bradapp@enteract.com> |