1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
|
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
<title>Modifying document data</title>
<link rel="stylesheet" href="../pugixml.css" type="text/css">
<meta name="generator" content="DocBook XSL Stylesheets V1.75.2">
<link rel="home" href="../manual.html" title="pugixml 1.2">
<link rel="up" href="../manual.html" title="pugixml 1.2">
<link rel="prev" href="access.html" title="Accessing document data">
<link rel="next" href="saving.html" title="Saving document">
</head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF">
<table width="100%"><tr>
<td>
<a href="http://pugixml.org/">pugixml 1.2</a> manual |
<a href="../manual.html">Overview</a> |
<a href="install.html">Installation</a> |
Document:
<a href="dom.html">Object model</a> · <a href="loading.html">Loading</a> · <a href="access.html">Accessing</a> · <b>Modifying</b> · <a href="saving.html">Saving</a> |
<a href="xpath.html">XPath</a> |
<a href="apiref.html">API Reference</a> |
<a href="toc.html">Table of Contents</a>
</td>
<td width="*" align="right"><div class="spirit-nav">
<a accesskey="p" href="access.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../manual.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../manual.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="saving.html"><img src="../images/next.png" alt="Next"></a>
</div></td>
</tr></table>
<hr>
<div class="section">
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
<a name="manual.modify"></a><a class="link" href="modify.html" title="Modifying document data"> Modifying document data</a>
</h2></div></div></div>
<div class="toc"><dl>
<dt><span class="section"><a href="modify.html#manual.modify.nodedata"> Setting node data</a></span></dt>
<dt><span class="section"><a href="modify.html#manual.modify.attrdata"> Setting attribute data</a></span></dt>
<dt><span class="section"><a href="modify.html#manual.modify.add"> Adding nodes/attributes</a></span></dt>
<dt><span class="section"><a href="modify.html#manual.modify.remove"> Removing nodes/attributes</a></span></dt>
<dt><span class="section"><a href="modify.html#manual.modify.text"> Working with text contents</a></span></dt>
<dt><span class="section"><a href="modify.html#manual.modify.clone"> Cloning nodes/attributes</a></span></dt>
</dl></div>
<p>
The document in pugixml is fully mutable: you can completely change the document
structure and modify the data of nodes/attributes. This section provides documentation
for the relevant functions. All functions take care of memory management and
structural integrity themselves, so they always result in structurally valid
tree - however, it is possible to create an invalid XML tree (for example,
by adding two attributes with the same name or by setting attribute/node name
to empty/invalid string). Tree modification is optimized for performance and
for memory consumption, so if you have enough memory you can create documents
from scratch with pugixml and later save them to file/stream instead of relying
on error-prone manual text writing and without too much overhead.
</p>
<p>
All member functions that change node/attribute data or structure are non-constant
and thus can not be called on constant handles. However, you can easily convert
constant handle to non-constant one by simple assignment: <code class="computeroutput"><span class="keyword">void</span>
<span class="identifier">foo</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span><span class="special">&</span> <span class="identifier">n</span><span class="special">)</span>
<span class="special">{</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">nc</span> <span class="special">=</span> <span class="identifier">n</span><span class="special">;</span> <span class="special">}</span></code>, so const-correctness
here mainly provides additional documentation.
</p>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="manual.modify.nodedata"></a><a class="link" href="modify.html#manual.modify.nodedata" title="Setting node data"> Setting node data</a>
</h3></div></div></div>
<a name="xml_node::set_name"></a><a name="xml_node::set_value"></a><p>
As discussed before, nodes can have name and value, both of which are strings.
Depending on node type, name or value may be absent. <a class="link" href="dom.html#node_document">node_document</a>
nodes do not have a name or value, <a class="link" href="dom.html#node_element">node_element</a>
and <a class="link" href="dom.html#node_declaration">node_declaration</a> nodes always
have a name but never have a value, <a class="link" href="dom.html#node_pcdata">node_pcdata</a>,
<a class="link" href="dom.html#node_cdata">node_cdata</a>, <a class="link" href="dom.html#node_comment">node_comment</a>
and <a class="link" href="dom.html#node_doctype">node_doctype</a> nodes never have a name
but always have a value (it may be empty though), <a class="link" href="dom.html#node_pi">node_pi</a>
nodes always have a name and a value (again, value may be empty). In order
to set node's name or value, you can use the following functions:
</p>
<pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">set_name</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="keyword">bool</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">set_value</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">rhs</span><span class="special">);</span>
</pre>
<p>
Both functions try to set the name/value to the specified string, and return
the operation result. The operation fails if the node can not have name or
value (for instance, when trying to call <code class="computeroutput"><span class="identifier">set_name</span></code>
on a <a class="link" href="dom.html#node_pcdata">node_pcdata</a> node), if the node handle
is null, or if there is insufficient memory to handle the request. The provided
string is copied into document managed memory and can be destroyed after
the function returns (for example, you can safely pass stack-allocated buffers
to these functions). The name/value content is not verified, so take care
to use only valid XML names, or the document may become malformed.
</p>
<p>
There is no equivalent of <a class="link" href="access.html#xml_node::child_value">child_value</a>
function for modifying text children of the node.
</p>
<p>
This is an example of setting node name and value (<a href="../samples/modify_base.cpp" target="_top">samples/modify_base.cpp</a>):
</p>
<p>
</p>
<pre class="programlisting"><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">node</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">child</span><span class="special">(</span><span class="string">"node"</span><span class="special">);</span>
<span class="comment">// change node name
</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">set_name</span><span class="special">(</span><span class="string">"notnode"</span><span class="special">);</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">", new node name: "</span> <span class="special"><<</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">name</span><span class="special">()</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
<span class="comment">// change comment text
</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">last_child</span><span class="special">().</span><span class="identifier">set_value</span><span class="special">(</span><span class="string">"useless comment"</span><span class="special">);</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">", new comment text: "</span> <span class="special"><<</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">last_child</span><span class="special">().</span><span class="identifier">value</span><span class="special">()</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
<span class="comment">// we can't change value of the element or name of the comment
</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">set_value</span><span class="special">(</span><span class="string">"1"</span><span class="special">)</span> <span class="special"><<</span> <span class="string">", "</span> <span class="special"><<</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">last_child</span><span class="special">().</span><span class="identifier">set_name</span><span class="special">(</span><span class="string">"2"</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
</pre>
<p>
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="manual.modify.attrdata"></a><a class="link" href="modify.html#manual.modify.attrdata" title="Setting attribute data"> Setting attribute data</a>
</h3></div></div></div>
<a name="xml_attribute::set_name"></a><a name="xml_attribute::set_value"></a><p>
All attributes have name and value, both of which are strings (value may
be empty). You can set them with the following functions:
</p>
<pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">xml_attribute</span><span class="special">::</span><span class="identifier">set_name</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="keyword">bool</span> <span class="identifier">xml_attribute</span><span class="special">::</span><span class="identifier">set_value</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">rhs</span><span class="special">);</span>
</pre>
<p>
Both functions try to set the name/value to the specified string, and return
the operation result. The operation fails if the attribute handle is null,
or if there is insufficient memory to handle the request. The provided string
is copied into document managed memory and can be destroyed after the function
returns (for example, you can safely pass stack-allocated buffers to these
functions). The name/value content is not verified, so take care to use only
valid XML names, or the document may become malformed.
</p>
<p>
In addition to string functions, several functions are provided for handling
attributes with numbers and booleans as values:
</p>
<pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">xml_attribute</span><span class="special">::</span><span class="identifier">set_value</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="keyword">bool</span> <span class="identifier">xml_attribute</span><span class="special">::</span><span class="identifier">set_value</span><span class="special">(</span><span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="keyword">bool</span> <span class="identifier">xml_attribute</span><span class="special">::</span><span class="identifier">set_value</span><span class="special">(</span><span class="keyword">double</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="keyword">bool</span> <span class="identifier">xml_attribute</span><span class="special">::</span><span class="identifier">set_value</span><span class="special">(</span><span class="keyword">bool</span> <span class="identifier">rhs</span><span class="special">);</span>
</pre>
<p>
The above functions convert the argument to string and then call the base
<code class="computeroutput"><span class="identifier">set_value</span></code> function. Integers
are converted to a decimal form, floating-point numbers are converted to
either decimal or scientific form, depending on the number magnitude, boolean
values are converted to either <code class="computeroutput"><span class="string">"true"</span></code>
or <code class="computeroutput"><span class="string">"false"</span></code>.
</p>
<div class="caution"><table border="0" summary="Caution">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Caution]" src="../images/caution.png"></td>
<th align="left">Caution</th>
</tr>
<tr><td align="left" valign="top"><p>
Number conversion functions depend on current C locale as set with <code class="computeroutput"><span class="identifier">setlocale</span></code>, so may generate unexpected
results if the locale is different from <code class="computeroutput"><span class="string">"C"</span></code>.
</p></td></tr>
</table></div>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
There are no portable 64-bit types in C++, so there is no corresponding
<code class="computeroutput"><span class="identifier">set_value</span></code> function. If
your platform has a 64-bit integer, you can easily write such a function
yourself.
</p></td></tr>
</table></div>
<a name="xml_attribute::assign"></a><p>
For convenience, all <code class="computeroutput"><span class="identifier">set_value</span></code>
functions have the corresponding assignment operators:
</p>
<pre class="programlisting"><span class="identifier">xml_attribute</span><span class="special">&</span> <span class="identifier">xml_attribute</span><span class="special">::</span><span class="keyword">operator</span><span class="special">=(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="identifier">xml_attribute</span><span class="special">&</span> <span class="identifier">xml_attribute</span><span class="special">::</span><span class="keyword">operator</span><span class="special">=(</span><span class="keyword">int</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="identifier">xml_attribute</span><span class="special">&</span> <span class="identifier">xml_attribute</span><span class="special">::</span><span class="keyword">operator</span><span class="special">=(</span><span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="identifier">xml_attribute</span><span class="special">&</span> <span class="identifier">xml_attribute</span><span class="special">::</span><span class="keyword">operator</span><span class="special">=(</span><span class="keyword">double</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="identifier">xml_attribute</span><span class="special">&</span> <span class="identifier">xml_attribute</span><span class="special">::</span><span class="keyword">operator</span><span class="special">=(</span><span class="keyword">bool</span> <span class="identifier">rhs</span><span class="special">);</span>
</pre>
<p>
These operators simply call the right <code class="computeroutput"><span class="identifier">set_value</span></code>
function and return the attribute they're called on; the return value of
<code class="computeroutput"><span class="identifier">set_value</span></code> is ignored, so
errors are ignored.
</p>
<p>
This is an example of setting attribute name and value (<a href="../samples/modify_base.cpp" target="_top">samples/modify_base.cpp</a>):
</p>
<p>
</p>
<pre class="programlisting"><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_attribute</span> <span class="identifier">attr</span> <span class="special">=</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"id"</span><span class="special">);</span>
<span class="comment">// change attribute name/value
</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">attr</span><span class="special">.</span><span class="identifier">set_name</span><span class="special">(</span><span class="string">"key"</span><span class="special">)</span> <span class="special"><<</span> <span class="string">", "</span> <span class="special"><<</span> <span class="identifier">attr</span><span class="special">.</span><span class="identifier">set_value</span><span class="special">(</span><span class="string">"345"</span><span class="special">);</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">", new attribute: "</span> <span class="special"><<</span> <span class="identifier">attr</span><span class="special">.</span><span class="identifier">name</span><span class="special">()</span> <span class="special"><<</span> <span class="string">"="</span> <span class="special"><<</span> <span class="identifier">attr</span><span class="special">.</span><span class="identifier">value</span><span class="special">()</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
<span class="comment">// we can use numbers or booleans
</span><span class="identifier">attr</span><span class="special">.</span><span class="identifier">set_value</span><span class="special">(</span><span class="number">1.234</span><span class="special">);</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"new attribute value: "</span> <span class="special"><<</span> <span class="identifier">attr</span><span class="special">.</span><span class="identifier">value</span><span class="special">()</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
<span class="comment">// we can also use assignment operators for more concise code
</span><span class="identifier">attr</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">;</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="string">"final attribute value: "</span> <span class="special"><<</span> <span class="identifier">attr</span><span class="special">.</span><span class="identifier">value</span><span class="special">()</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
</pre>
<p>
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="manual.modify.add"></a><a class="link" href="modify.html#manual.modify.add" title="Adding nodes/attributes"> Adding nodes/attributes</a>
</h3></div></div></div>
<a name="xml_node::prepend_attribute"></a><a name="xml_node::append_attribute"></a><a name="xml_node::insert_attribute_after"></a><a name="xml_node::insert_attribute_before"></a><a name="xml_node::prepend_child"></a><a name="xml_node::append_child"></a><a name="xml_node::insert_child_after"></a><a name="xml_node::insert_child_before"></a><p>
Nodes and attributes do not exist without a document tree, so you can't create
them without adding them to some document. A node or attribute can be created
at the end of node/attribute list or before/after some other node:
</p>
<pre class="programlisting"><span class="identifier">xml_attribute</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">append_attribute</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">name</span><span class="special">);</span>
<span class="identifier">xml_attribute</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">prepend_attribute</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">name</span><span class="special">);</span>
<span class="identifier">xml_attribute</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">insert_attribute_after</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">name</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">xml_attribute</span><span class="special">&</span> <span class="identifier">attr</span><span class="special">);</span>
<span class="identifier">xml_attribute</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">insert_attribute_before</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">name</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">xml_attribute</span><span class="special">&</span> <span class="identifier">attr</span><span class="special">);</span>
<span class="identifier">xml_node</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">append_child</span><span class="special">(</span><span class="identifier">xml_node_type</span> <span class="identifier">type</span> <span class="special">=</span> <span class="identifier">node_element</span><span class="special">);</span>
<span class="identifier">xml_node</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">prepend_child</span><span class="special">(</span><span class="identifier">xml_node_type</span> <span class="identifier">type</span> <span class="special">=</span> <span class="identifier">node_element</span><span class="special">);</span>
<span class="identifier">xml_node</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">insert_child_after</span><span class="special">(</span><span class="identifier">xml_node_type</span> <span class="identifier">type</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">xml_node</span><span class="special">&</span> <span class="identifier">node</span><span class="special">);</span>
<span class="identifier">xml_node</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">insert_child_before</span><span class="special">(</span><span class="identifier">xml_node_type</span> <span class="identifier">type</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">xml_node</span><span class="special">&</span> <span class="identifier">node</span><span class="special">);</span>
<span class="identifier">xml_node</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">append_child</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">name</span><span class="special">);</span>
<span class="identifier">xml_node</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">prepend_child</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">name</span><span class="special">);</span>
<span class="identifier">xml_node</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">insert_child_after</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">name</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">xml_node</span><span class="special">&</span> <span class="identifier">node</span><span class="special">);</span>
<span class="identifier">xml_node</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">insert_child_before</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">name</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">xml_node</span><span class="special">&</span> <span class="identifier">node</span><span class="special">);</span>
</pre>
<p>
<code class="computeroutput"><span class="identifier">append_attribute</span></code> and <code class="computeroutput"><span class="identifier">append_child</span></code> create a new node/attribute
at the end of the corresponding list of the node the method is called on;
<code class="computeroutput"><span class="identifier">prepend_attribute</span></code> and <code class="computeroutput"><span class="identifier">prepend_child</span></code> create a new node/attribute
at the beginning of the list; <code class="computeroutput"><span class="identifier">insert_attribute_after</span></code>,
<code class="computeroutput"><span class="identifier">insert_attribute_before</span></code>,
<code class="computeroutput"><span class="identifier">insert_child_after</span></code> and <code class="computeroutput"><span class="identifier">insert_attribute_before</span></code> add the node/attribute
before or after the specified node/attribute.
</p>
<p>
Attribute functions create an attribute with the specified name; you can
specify the empty name and change the name later if you want to. Node functions
with the <code class="computeroutput"><span class="identifier">type</span></code> argument create
the node with the specified type; since node type can't be changed, you have
to know the desired type beforehand. Also note that not all types can be
added as children; see below for clarification. Node functions with the
<code class="computeroutput"><span class="identifier">name</span></code> argument create the
element node (<a class="link" href="dom.html#node_element">node_element</a>) with the
specified name.
</p>
<p>
All functions return the handle to the created object on success, and null
handle on failure. There are several reasons for failure:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
Adding fails if the target node is null;
</li>
<li class="listitem">
Only <a class="link" href="dom.html#node_element">node_element</a> nodes can contain
attributes, so attribute adding fails if node is not an element;
</li>
<li class="listitem">
Only <a class="link" href="dom.html#node_document">node_document</a> and <a class="link" href="dom.html#node_element">node_element</a>
nodes can contain children, so child node adding fails if the target
node is not an element or a document;
</li>
<li class="listitem">
<a class="link" href="dom.html#node_document">node_document</a> and <a class="link" href="dom.html#node_null">node_null</a>
nodes can not be inserted as children, so passing <a class="link" href="dom.html#node_document">node_document</a>
or <a class="link" href="dom.html#node_null">node_null</a> value as <code class="computeroutput"><span class="identifier">type</span></code> results in operation failure;
</li>
<li class="listitem">
<a class="link" href="dom.html#node_declaration">node_declaration</a> nodes can only
be added as children of the document node; attempt to insert declaration
node as a child of an element node fails;
</li>
<li class="listitem">
Adding node/attribute results in memory allocation, which may fail;
</li>
<li class="listitem">
Insertion functions fail if the specified node or attribute is null or
is not in the target node's children/attribute list.
</li>
</ul></div>
<p>
Even if the operation fails, the document remains in consistent state, but
the requested node/attribute is not added.
</p>
<div class="caution"><table border="0" summary="Caution">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Caution]" src="../images/caution.png"></td>
<th align="left">Caution</th>
</tr>
<tr><td align="left" valign="top"><p>
attribute() and child() functions do not add attributes or nodes to the
tree, so code like <code class="computeroutput"><span class="identifier">node</span><span class="special">.</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"id"</span><span class="special">)</span> <span class="special">=</span> <span class="number">123</span><span class="special">;</span></code> will not do anything if <code class="computeroutput"><span class="identifier">node</span></code> does not have an attribute with
name <code class="computeroutput"><span class="string">"id"</span></code>. Make sure
you're operating with existing attributes/nodes by adding them if necessary.
</p></td></tr>
</table></div>
<p>
This is an example of adding new attributes/nodes to the document (<a href="../samples/modify_add.cpp" target="_top">samples/modify_add.cpp</a>):
</p>
<p>
</p>
<pre class="programlisting"><span class="comment">// add node with some name
</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">node</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">append_child</span><span class="special">(</span><span class="string">"node"</span><span class="special">);</span>
<span class="comment">// add description node with text child
</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">descr</span> <span class="special">=</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">append_child</span><span class="special">(</span><span class="string">"description"</span><span class="special">);</span>
<span class="identifier">descr</span><span class="special">.</span><span class="identifier">append_child</span><span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">node_pcdata</span><span class="special">).</span><span class="identifier">set_value</span><span class="special">(</span><span class="string">"Simple node"</span><span class="special">);</span>
<span class="comment">// add param node before the description
</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">param</span> <span class="special">=</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">insert_child_before</span><span class="special">(</span><span class="string">"param"</span><span class="special">,</span> <span class="identifier">descr</span><span class="special">);</span>
<span class="comment">// add attributes to param node
</span><span class="identifier">param</span><span class="special">.</span><span class="identifier">append_attribute</span><span class="special">(</span><span class="string">"name"</span><span class="special">)</span> <span class="special">=</span> <span class="string">"version"</span><span class="special">;</span>
<span class="identifier">param</span><span class="special">.</span><span class="identifier">append_attribute</span><span class="special">(</span><span class="string">"value"</span><span class="special">)</span> <span class="special">=</span> <span class="number">1.1</span><span class="special">;</span>
<span class="identifier">param</span><span class="special">.</span><span class="identifier">insert_attribute_after</span><span class="special">(</span><span class="string">"type"</span><span class="special">,</span> <span class="identifier">param</span><span class="special">.</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"name"</span><span class="special">))</span> <span class="special">=</span> <span class="string">"float"</span><span class="special">;</span>
</pre>
<p>
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="manual.modify.remove"></a><a class="link" href="modify.html#manual.modify.remove" title="Removing nodes/attributes"> Removing nodes/attributes</a>
</h3></div></div></div>
<a name="xml_node::remove_attribute"></a><a name="xml_node::remove_child"></a><p>
If you do not want your document to contain some node or attribute, you can
remove it with one of the following functions:
</p>
<pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">remove_attribute</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">xml_attribute</span><span class="special">&</span> <span class="identifier">a</span><span class="special">);</span>
<span class="keyword">bool</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">remove_child</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">xml_node</span><span class="special">&</span> <span class="identifier">n</span><span class="special">);</span>
</pre>
<p>
<code class="computeroutput"><span class="identifier">remove_attribute</span></code> removes
the attribute from the attribute list of the node, and returns the operation
result. <code class="computeroutput"><span class="identifier">remove_child</span></code> removes
the child node with the entire subtree (including all descendant nodes and
attributes) from the document, and returns the operation result. Removing
fails if one of the following is true:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
The node the function is called on is null;
</li>
<li class="listitem">
The attribute/node to be removed is null;
</li>
<li class="listitem">
The attribute/node to be removed is not in the node's attribute/child
list.
</li>
</ul></div>
<p>
Removing the attribute or node invalidates all handles to the same underlying
object, and also invalidates all iterators pointing to the same object. Removing
node also invalidates all past-the-end iterators to its attribute or child
node list. Be careful to ensure that all such handles and iterators either
do not exist or are not used after the attribute/node is removed.
</p>
<p>
If you want to remove the attribute or child node by its name, two additional
helper functions are available:
</p>
<pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">remove_attribute</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">name</span><span class="special">);</span>
<span class="keyword">bool</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">remove_child</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">name</span><span class="special">);</span>
</pre>
<p>
These functions look for the first attribute or child with the specified
name, and then remove it, returning the result. If there is no attribute
or child with such name, the function returns <code class="computeroutput"><span class="keyword">false</span></code>;
if there are two nodes with the given name, only the first node is deleted.
If you want to delete all nodes with the specified name, you can use code
like this: <code class="computeroutput"><span class="keyword">while</span> <span class="special">(</span><span class="identifier">node</span><span class="special">.</span><span class="identifier">remove_child</span><span class="special">(</span><span class="string">"tool"</span><span class="special">))</span> <span class="special">;</span></code>.
</p>
<p>
This is an example of removing attributes/nodes from the document (<a href="../samples/modify_remove.cpp" target="_top">samples/modify_remove.cpp</a>):
</p>
<p>
</p>
<pre class="programlisting"><span class="comment">// remove description node with the whole subtree
</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">node</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">child</span><span class="special">(</span><span class="string">"node"</span><span class="special">);</span>
<span class="identifier">node</span><span class="special">.</span><span class="identifier">remove_child</span><span class="special">(</span><span class="string">"description"</span><span class="special">);</span>
<span class="comment">// remove id attribute
</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">param</span> <span class="special">=</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">child</span><span class="special">(</span><span class="string">"param"</span><span class="special">);</span>
<span class="identifier">param</span><span class="special">.</span><span class="identifier">remove_attribute</span><span class="special">(</span><span class="string">"value"</span><span class="special">);</span>
<span class="comment">// we can also remove nodes/attributes by handles
</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_attribute</span> <span class="identifier">id</span> <span class="special">=</span> <span class="identifier">param</span><span class="special">.</span><span class="identifier">attribute</span><span class="special">(</span><span class="string">"name"</span><span class="special">);</span>
<span class="identifier">param</span><span class="special">.</span><span class="identifier">remove_attribute</span><span class="special">(</span><span class="identifier">id</span><span class="special">);</span>
</pre>
<p>
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="manual.modify.text"></a><a class="link" href="modify.html#manual.modify.text" title="Working with text contents"> Working with text contents</a>
</h3></div></div></div>
<p>
pugixml provides a special class, <code class="computeroutput"><span class="identifier">xml_text</span></code>,
to work with text contents stored as a value of some node, i.e. <code class="computeroutput"><span class="special"><</span><span class="identifier">node</span><span class="special">><</span><span class="identifier">description</span><span class="special">></span><span class="identifier">This</span> <span class="identifier">is</span> <span class="identifier">a</span> <span class="identifier">node</span><span class="special"></</span><span class="identifier">description</span><span class="special">></</span><span class="identifier">node</span><span class="special">></span></code>.
Working with text objects to retrieve data is described in <a class="link" href="access.html#manual.access.text" title="Working with text contents">the
documentation for accessing document data</a>; this section describes
the modification interface of <code class="computeroutput"><span class="identifier">xml_text</span></code>.
</p>
<a name="xml_text::set"></a><p>
Once you have an <code class="computeroutput"><span class="identifier">xml_text</span></code>
object, you can set the text contents using the following function:
</p>
<pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">xml_text</span><span class="special">::</span><span class="identifier">set</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">rhs</span><span class="special">);</span>
</pre>
<p>
This function tries to set the contents to the specified string, and returns
the operation result. The operation fails if the text object was retrieved
from a node that can not have a value and is not an element node (i.e. it
is a <a class="link" href="dom.html#node_declaration">node_declaration</a> node), if the
text object is empty, or if there is insufficient memory to handle the request.
The provided string is copied into document managed memory and can be destroyed
after the function returns (for example, you can safely pass stack-allocated
buffers to this function). Note that if the text object was retrieved from
an element node, this function creates the PCDATA child node if necessary
(i.e. if the element node does not have a PCDATA/CDATA child already).
</p>
<a name="xml_text::set_value"></a><p>
In addition to a string function, several functions are provided for handling
text with numbers and booleans as contents:
</p>
<pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">xml_text</span><span class="special">::</span><span class="identifier">set</span><span class="special">(</span><span class="keyword">int</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="keyword">bool</span> <span class="identifier">xml_text</span><span class="special">::</span><span class="identifier">set</span><span class="special">(</span><span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="keyword">bool</span> <span class="identifier">xml_text</span><span class="special">::</span><span class="identifier">set</span><span class="special">(</span><span class="keyword">double</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="keyword">bool</span> <span class="identifier">xml_text</span><span class="special">::</span><span class="identifier">set</span><span class="special">(</span><span class="keyword">bool</span> <span class="identifier">rhs</span><span class="special">);</span>
</pre>
<p>
The above functions convert the argument to string and then call the base
<code class="computeroutput"><span class="identifier">set</span></code> function. These functions
have the same semantics as similar <code class="computeroutput"><span class="identifier">xml_attribute</span></code>
functions. You can <a class="link" href="modify.html#xml_attribute::set_value">refer to documentation
for the attribute functions</a> for details.
</p>
<a name="xml_text::assign"></a><p>
For convenience, all <code class="computeroutput"><span class="identifier">set</span></code>
functions have the corresponding assignment operators:
</p>
<pre class="programlisting"><span class="identifier">xml_text</span><span class="special">&</span> <span class="identifier">xml_text</span><span class="special">::</span><span class="keyword">operator</span><span class="special">=(</span><span class="keyword">const</span> <span class="identifier">char_t</span><span class="special">*</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="identifier">xml_text</span><span class="special">&</span> <span class="identifier">xml_text</span><span class="special">::</span><span class="keyword">operator</span><span class="special">=(</span><span class="keyword">int</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="identifier">xml_text</span><span class="special">&</span> <span class="identifier">xml_text</span><span class="special">::</span><span class="keyword">operator</span><span class="special">=(</span><span class="keyword">unsigned</span> <span class="keyword">int</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="identifier">xml_text</span><span class="special">&</span> <span class="identifier">xml_text</span><span class="special">::</span><span class="keyword">operator</span><span class="special">=(</span><span class="keyword">double</span> <span class="identifier">rhs</span><span class="special">);</span>
<span class="identifier">xml_text</span><span class="special">&</span> <span class="identifier">xml_text</span><span class="special">::</span><span class="keyword">operator</span><span class="special">=(</span><span class="keyword">bool</span> <span class="identifier">rhs</span><span class="special">);</span>
</pre>
<p>
These operators simply call the right <code class="computeroutput"><span class="identifier">set</span></code>
function and return the attribute they're called on; the return value of
<code class="computeroutput"><span class="identifier">set</span></code> is ignored, so errors
are ignored.
</p>
<p>
This is an example of using <code class="computeroutput"><span class="identifier">xml_text</span></code>
object to modify text contents (<a href="../samples/text.cpp" target="_top">samples/text.cpp</a>):
</p>
<p>
</p>
<pre class="programlisting"><span class="comment">// change project version
</span><span class="identifier">project</span><span class="special">.</span><span class="identifier">child</span><span class="special">(</span><span class="string">"version"</span><span class="special">).</span><span class="identifier">text</span><span class="special">()</span> <span class="special">=</span> <span class="number">1.2</span><span class="special">;</span>
<span class="comment">// add description element and set the contents
</span><span class="comment">// note that we do not have to explicitly add the node_pcdata child
</span><span class="identifier">project</span><span class="special">.</span><span class="identifier">append_child</span><span class="special">(</span><span class="string">"description"</span><span class="special">).</span><span class="identifier">text</span><span class="special">().</span><span class="identifier">set</span><span class="special">(</span><span class="string">"a test project"</span><span class="special">);</span>
</pre>
<p>
</p>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="manual.modify.clone"></a><a class="link" href="modify.html#manual.modify.clone" title="Cloning nodes/attributes"> Cloning nodes/attributes</a>
</h3></div></div></div>
<a name="xml_node::prepend_copy"></a><a name="xml_node::append_copy"></a><a name="xml_node::insert_copy_after"></a><a name="xml_node::insert_copy_before"></a><p>
With the help of previously described functions, it is possible to create
trees with any contents and structure, including cloning the existing data.
However since this is an often needed operation, pugixml provides built-in
node/attribute cloning facilities. Since nodes and attributes do not exist
without a document tree, you can't create a standalone copy - you have to
immediately insert it somewhere in the tree. For this, you can use one of
the following functions:
</p>
<pre class="programlisting"><span class="identifier">xml_attribute</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">append_copy</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">xml_attribute</span><span class="special">&</span> <span class="identifier">proto</span><span class="special">);</span>
<span class="identifier">xml_attribute</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">prepend_copy</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">xml_attribute</span><span class="special">&</span> <span class="identifier">proto</span><span class="special">);</span>
<span class="identifier">xml_attribute</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">insert_copy_after</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">xml_attribute</span><span class="special">&</span> <span class="identifier">proto</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">xml_attribute</span><span class="special">&</span> <span class="identifier">attr</span><span class="special">);</span>
<span class="identifier">xml_attribute</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">insert_copy_before</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">xml_attribute</span><span class="special">&</span> <span class="identifier">proto</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">xml_attribute</span><span class="special">&</span> <span class="identifier">attr</span><span class="special">);</span>
<span class="identifier">xml_node</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">append_copy</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">xml_node</span><span class="special">&</span> <span class="identifier">proto</span><span class="special">);</span>
<span class="identifier">xml_node</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">prepend_copy</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">xml_node</span><span class="special">&</span> <span class="identifier">proto</span><span class="special">);</span>
<span class="identifier">xml_node</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">insert_copy_after</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">xml_node</span><span class="special">&</span> <span class="identifier">proto</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">xml_node</span><span class="special">&</span> <span class="identifier">node</span><span class="special">);</span>
<span class="identifier">xml_node</span> <span class="identifier">xml_node</span><span class="special">::</span><span class="identifier">insert_copy_before</span><span class="special">(</span><span class="keyword">const</span> <span class="identifier">xml_node</span><span class="special">&</span> <span class="identifier">proto</span><span class="special">,</span> <span class="keyword">const</span> <span class="identifier">xml_node</span><span class="special">&</span> <span class="identifier">node</span><span class="special">);</span>
</pre>
<p>
These functions mirror the structure of <code class="computeroutput"><span class="identifier">append_child</span></code>,
<code class="computeroutput"><span class="identifier">prepend_child</span></code>, <code class="computeroutput"><span class="identifier">insert_child_before</span></code> and related functions
- they take the handle to the prototype object, which is to be cloned, insert
a new attribute/node at the appropriate place, and then copy the attribute
data or the whole node subtree to the new object. The functions return the
handle to the resulting duplicate object, or null handle on failure.
</p>
<p>
The attribute is copied along with the name and value; the node is copied
along with its type, name and value; additionally attribute list and all
children are recursively cloned, resulting in the deep subtree clone. The
prototype object can be a part of the same document, or a part of any other
document.
</p>
<p>
The failure conditions resemble those of <code class="computeroutput"><span class="identifier">append_child</span></code>,
<code class="computeroutput"><span class="identifier">insert_child_before</span></code> and related
functions, <a class="link" href="modify.html#xml_node::append_child">consult their documentation
for more information</a>. There are additional caveats specific to cloning
functions:
</p>
<div class="itemizedlist"><ul class="itemizedlist" type="disc">
<li class="listitem">
Cloning null handles results in operation failure;
</li>
<li class="listitem">
Node cloning starts with insertion of the node of the same type as that
of the prototype; for this reason, cloning functions can not be directly
used to clone entire documents, since <a class="link" href="dom.html#node_document">node_document</a>
is not a valid insertion type. The example below provides a workaround.
</li>
<li class="listitem">
It is possible to copy a subtree as a child of some node inside this
subtree, i.e. <code class="computeroutput"><span class="identifier">node</span><span class="special">.</span><span class="identifier">append_copy</span><span class="special">(</span><span class="identifier">node</span><span class="special">.</span><span class="identifier">parent</span><span class="special">().</span><span class="identifier">parent</span><span class="special">());</span></code>.
This is a valid operation, and it results in a clone of the subtree in
the state before cloning started, i.e. no infinite recursion takes place.
</li>
</ul></div>
<p>
This is an example with one possible implementation of include tags in XML
(<a href="../samples/include.cpp" target="_top">samples/include.cpp</a>). It illustrates
node cloning and usage of other document modification functions:
</p>
<p>
</p>
<pre class="programlisting"><span class="keyword">bool</span> <span class="identifier">load_preprocess</span><span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_document</span><span class="special">&</span> <span class="identifier">doc</span><span class="special">,</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">path</span><span class="special">);</span>
<span class="keyword">bool</span> <span class="identifier">preprocess</span><span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">node</span><span class="special">)</span>
<span class="special">{</span>
<span class="keyword">for</span> <span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">child</span> <span class="special">=</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">first_child</span><span class="special">();</span> <span class="identifier">child</span><span class="special">;</span> <span class="special">)</span>
<span class="special">{</span>
<span class="keyword">if</span> <span class="special">(</span><span class="identifier">child</span><span class="special">.</span><span class="identifier">type</span><span class="special">()</span> <span class="special">==</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">node_pi</span> <span class="special">&&</span> <span class="identifier">strcmp</span><span class="special">(</span><span class="identifier">child</span><span class="special">.</span><span class="identifier">name</span><span class="special">(),</span> <span class="string">"include"</span><span class="special">)</span> <span class="special">==</span> <span class="number">0</span><span class="special">)</span>
<span class="special">{</span>
<span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">include</span> <span class="special">=</span> <span class="identifier">child</span><span class="special">;</span>
<span class="comment">// load new preprocessed document (note: ideally this should handle relative paths)
</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">path</span> <span class="special">=</span> <span class="identifier">include</span><span class="special">.</span><span class="identifier">value</span><span class="special">();</span>
<span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_document</span> <span class="identifier">doc</span><span class="special">;</span>
<span class="keyword">if</span> <span class="special">(!</span><span class="identifier">load_preprocess</span><span class="special">(</span><span class="identifier">doc</span><span class="special">,</span> <span class="identifier">path</span><span class="special">))</span> <span class="keyword">return</span> <span class="keyword">false</span><span class="special">;</span>
<span class="comment">// insert the comment marker above include directive
</span> <span class="identifier">node</span><span class="special">.</span><span class="identifier">insert_child_before</span><span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">node_comment</span><span class="special">,</span> <span class="identifier">include</span><span class="special">).</span><span class="identifier">set_value</span><span class="special">(</span><span class="identifier">path</span><span class="special">);</span>
<span class="comment">// copy the document above the include directive (this retains the original order!)
</span> <span class="keyword">for</span> <span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_node</span> <span class="identifier">ic</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">first_child</span><span class="special">();</span> <span class="identifier">ic</span><span class="special">;</span> <span class="identifier">ic</span> <span class="special">=</span> <span class="identifier">ic</span><span class="special">.</span><span class="identifier">next_sibling</span><span class="special">())</span>
<span class="special">{</span>
<span class="identifier">node</span><span class="special">.</span><span class="identifier">insert_copy_before</span><span class="special">(</span><span class="identifier">ic</span><span class="special">,</span> <span class="identifier">include</span><span class="special">);</span>
<span class="special">}</span>
<span class="comment">// remove the include node and move to the next child
</span> <span class="identifier">child</span> <span class="special">=</span> <span class="identifier">child</span><span class="special">.</span><span class="identifier">next_sibling</span><span class="special">();</span>
<span class="identifier">node</span><span class="special">.</span><span class="identifier">remove_child</span><span class="special">(</span><span class="identifier">include</span><span class="special">);</span>
<span class="special">}</span>
<span class="keyword">else</span>
<span class="special">{</span>
<span class="keyword">if</span> <span class="special">(!</span><span class="identifier">preprocess</span><span class="special">(</span><span class="identifier">child</span><span class="special">))</span> <span class="keyword">return</span> <span class="keyword">false</span><span class="special">;</span>
<span class="identifier">child</span> <span class="special">=</span> <span class="identifier">child</span><span class="special">.</span><span class="identifier">next_sibling</span><span class="special">();</span>
<span class="special">}</span>
<span class="special">}</span>
<span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span>
<span class="special">}</span>
<span class="keyword">bool</span> <span class="identifier">load_preprocess</span><span class="special">(</span><span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_document</span><span class="special">&</span> <span class="identifier">doc</span><span class="special">,</span> <span class="keyword">const</span> <span class="keyword">char</span><span class="special">*</span> <span class="identifier">path</span><span class="special">)</span>
<span class="special">{</span>
<span class="identifier">pugi</span><span class="special">::</span><span class="identifier">xml_parse_result</span> <span class="identifier">result</span> <span class="special">=</span> <span class="identifier">doc</span><span class="special">.</span><span class="identifier">load_file</span><span class="special">(</span><span class="identifier">path</span><span class="special">,</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">parse_default</span> <span class="special">|</span> <span class="identifier">pugi</span><span class="special">::</span><span class="identifier">parse_pi</span><span class="special">);</span> <span class="comment">// for <?include?>
</span>
<span class="keyword">return</span> <span class="identifier">result</span> <span class="special">?</span> <span class="identifier">preprocess</span><span class="special">(</span><span class="identifier">doc</span><span class="special">)</span> <span class="special">:</span> <span class="keyword">false</span><span class="special">;</span>
<span class="special">}</span>
</pre>
<p>
</p>
</div>
</div>
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
<td align="left"></td>
<td align="right"><div class="copyright-footer">Copyright © 2012 Arseny Kapoulkine<p>
Distributed under the MIT License
</p>
</div></td>
</tr></table>
<hr>
<table width="100%"><tr>
<td>
<a href="http://pugixml.org/">pugixml 1.2</a> manual |
<a href="../manual.html">Overview</a> |
<a href="install.html">Installation</a> |
Document:
<a href="dom.html">Object model</a> · <a href="loading.html">Loading</a> · <a href="access.html">Accessing</a> · <b>Modifying</b> · <a href="saving.html">Saving</a> |
<a href="xpath.html">XPath</a> |
<a href="apiref.html">API Reference</a> |
<a href="toc.html">Table of Contents</a>
</td>
<td width="*" align="right"><div class="spirit-nav">
<a accesskey="p" href="access.html"><img src="../images/prev.png" alt="Prev"></a><a accesskey="u" href="../manual.html"><img src="../images/up.png" alt="Up"></a><a accesskey="h" href="../manual.html"><img src="../images/home.png" alt="Home"></a><a accesskey="n" href="saving.html"><img src="../images/next.png" alt="Next"></a>
</div></td>
</tr></table>
</body>
</html>
|
