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  • Committer: Jacek Nykis
  • Date: 2015-01-05 16:17:05 UTC
  • Revision ID: jacek.nykis@canonical.com-20150105161705-w544l1h5mcg7u4w9
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wp-includes/SimplePie/Parser.php
 
1
<?php
 
2
/**
 
3
 * SimplePie
 
4
 *
 
5
 * A PHP-Based RSS and Atom Feed Framework.
 
6
 * Takes the hard work out of managing a complete RSS/Atom solution.
 
7
 *
 
8
 * Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors
 
9
 * All rights reserved.
 
10
 *
 
11
 * Redistribution and use in source and binary forms, with or without modification, are
 
12
 * permitted provided that the following conditions are met:
 
13
 *
 
14
 *      * Redistributions of source code must retain the above copyright notice, this list of
 
15
 *        conditions and the following disclaimer.
 
16
 *
 
17
 *      * Redistributions in binary form must reproduce the above copyright notice, this list
 
18
 *        of conditions and the following disclaimer in the documentation and/or other materials
 
19
 *        provided with the distribution.
 
20
 *
 
21
 *      * Neither the name of the SimplePie Team nor the names of its contributors may be used
 
22
 *        to endorse or promote products derived from this software without specific prior
 
23
 *        written permission.
 
24
 *
 
25
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
 
26
 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
 
27
 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS
 
28
 * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 
29
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 
30
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 
31
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 
32
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 
33
 * POSSIBILITY OF SUCH DAMAGE.
 
34
 *
 
35
 * @package SimplePie
 
36
 * @version 1.3.1
 
37
 * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue
 
38
 * @author Ryan Parman
 
39
 * @author Geoffrey Sneddon
 
40
 * @author Ryan McCue
 
41
 * @link http://simplepie.org/ SimplePie
 
42
 * @license http://www.opensource.org/licenses/bsd-license.php BSD License
 
43
 */
 
44
 
 
45
/**
 
46
 * Parses XML into something sane
 
47
 *
 
48
 *
 
49
 * This class can be overloaded with {@see SimplePie::set_parser_class()}
 
50
 *
 
51
 * @package SimplePie
 
52
 * @subpackage Parsing
 
53
 */
 
54
class SimplePie_Parser
 
55
{
 
56
        var $error_code;
 
57
        var $error_string;
 
58
        var $current_line;
 
59
        var $current_column;
 
60
        var $current_byte;
 
61
        var $separator = ' ';
 
62
        var $namespace = array('');
 
63
        var $element = array('');
 
64
        var $xml_base = array('');
 
65
        var $xml_base_explicit = array(false);
 
66
        var $xml_lang = array('');
 
67
        var $data = array();
 
68
        var $datas = array(array());
 
69
        var $current_xhtml_construct = -1;
 
70
        var $encoding;
 
71
        protected $registry;
 
72
 
 
73
        public function set_registry(SimplePie_Registry $registry)
 
74
        {
 
75
                $this->registry = $registry;
 
76
        }
 
77
 
 
78
        public function parse(&$data, $encoding)
 
79
        {
 
80
                // Use UTF-8 if we get passed US-ASCII, as every US-ASCII character is a UTF-8 character
 
81
                if (strtoupper($encoding) === 'US-ASCII')
 
82
                {
 
83
                        $this->encoding = 'UTF-8';
 
84
                }
 
85
                else
 
86
                {
 
87
                        $this->encoding = $encoding;
 
88
                }
 
89
 
 
90
                // Strip BOM:
 
91
                // UTF-32 Big Endian BOM
 
92
                if (substr($data, 0, 4) === "\x00\x00\xFE\xFF")
 
93
                {
 
94
                        $data = substr($data, 4);
 
95
                }
 
96
                // UTF-32 Little Endian BOM
 
97
                elseif (substr($data, 0, 4) === "\xFF\xFE\x00\x00")
 
98
                {
 
99
                        $data = substr($data, 4);
 
100
                }
 
101
                // UTF-16 Big Endian BOM
 
102
                elseif (substr($data, 0, 2) === "\xFE\xFF")
 
103
                {
 
104
                        $data = substr($data, 2);
 
105
                }
 
106
                // UTF-16 Little Endian BOM
 
107
                elseif (substr($data, 0, 2) === "\xFF\xFE")
 
108
                {
 
109
                        $data = substr($data, 2);
 
110
                }
 
111
                // UTF-8 BOM
 
112
                elseif (substr($data, 0, 3) === "\xEF\xBB\xBF")
 
113
                {
 
114
                        $data = substr($data, 3);
 
115
                }
 
116
 
 
117
                if (substr($data, 0, 5) === '<?xml' && strspn(substr($data, 5, 1), "\x09\x0A\x0D\x20") && ($pos = strpos($data, '?>')) !== false)
 
118
                {
 
119
                        $declaration = $this->registry->create('XML_Declaration_Parser', array(substr($data, 5, $pos - 5)));
 
120
                        if ($declaration->parse())
 
121
                        {
 
122
                                $data = substr($data, $pos + 2);
 
123
                                $data = '<?xml version="' . $declaration->version . '" encoding="' . $encoding . '" standalone="' . (($declaration->standalone) ? 'yes' : 'no') . '"?>' . $data;
 
124
                        }
 
125
                        else
 
126
                        {
 
127
                                $this->error_string = 'SimplePie bug! Please report this!';
 
128
                                return false;
 
129
                        }
 
130
                }
 
131
 
 
132
                $return = true;
 
133
 
 
134
                static $xml_is_sane = null;
 
135
                if ($xml_is_sane === null)
 
136
                {
 
137
                        $parser_check = xml_parser_create();
 
138
                        xml_parse_into_struct($parser_check, '<foo>&amp;</foo>', $values);
 
139
                        xml_parser_free($parser_check);
 
140
                        $xml_is_sane = isset($values[0]['value']);
 
141
                }
 
142
 
 
143
                // Create the parser
 
144
                if ($xml_is_sane)
 
145
                {
 
146
                        $xml = xml_parser_create_ns($this->encoding, $this->separator);
 
147
                        xml_parser_set_option($xml, XML_OPTION_SKIP_WHITE, 1);
 
148
                        xml_parser_set_option($xml, XML_OPTION_CASE_FOLDING, 0);
 
149
                        xml_set_object($xml, $this);
 
150
                        xml_set_character_data_handler($xml, 'cdata');
 
151
                        xml_set_element_handler($xml, 'tag_open', 'tag_close');
 
152
 
 
153
                        // Parse!
 
154
                        if (!xml_parse($xml, $data, true))
 
155
                        {
 
156
                                $this->error_code = xml_get_error_code($xml);
 
157
                                $this->error_string = xml_error_string($this->error_code);
 
158
                                $return = false;
 
159
                        }
 
160
                        $this->current_line = xml_get_current_line_number($xml);
 
161
                        $this->current_column = xml_get_current_column_number($xml);
 
162
                        $this->current_byte = xml_get_current_byte_index($xml);
 
163
                        xml_parser_free($xml);
 
164
                        return $return;
 
165
                }
 
166
                else
 
167
                {
 
168
                        libxml_clear_errors();
 
169
                        $xml = new XMLReader();
 
170
                        $xml->xml($data);
 
171
                        while (@$xml->read())
 
172
                        {
 
173
                                switch ($xml->nodeType)
 
174
                                {
 
175
 
 
176
                                        case constant('XMLReader::END_ELEMENT'):
 
177
                                                if ($xml->namespaceURI !== '')
 
178
                                                {
 
179
                                                        $tagName = $xml->namespaceURI . $this->separator . $xml->localName;
 
180
                                                }
 
181
                                                else
 
182
                                                {
 
183
                                                        $tagName = $xml->localName;
 
184
                                                }
 
185
                                                $this->tag_close(null, $tagName);
 
186
                                                break;
 
187
                                        case constant('XMLReader::ELEMENT'):
 
188
                                                $empty = $xml->isEmptyElement;
 
189
                                                if ($xml->namespaceURI !== '')
 
190
                                                {
 
191
                                                        $tagName = $xml->namespaceURI . $this->separator . $xml->localName;
 
192
                                                }
 
193
                                                else
 
194
                                                {
 
195
                                                        $tagName = $xml->localName;
 
196
                                                }
 
197
                                                $attributes = array();
 
198
                                                while ($xml->moveToNextAttribute())
 
199
                                                {
 
200
                                                        if ($xml->namespaceURI !== '')
 
201
                                                        {
 
202
                                                                $attrName = $xml->namespaceURI . $this->separator . $xml->localName;
 
203
                                                        }
 
204
                                                        else
 
205
                                                        {
 
206
                                                                $attrName = $xml->localName;
 
207
                                                        }
 
208
                                                        $attributes[$attrName] = $xml->value;
 
209
                                                }
 
210
                                                $this->tag_open(null, $tagName, $attributes);
 
211
                                                if ($empty)
 
212
                                                {
 
213
                                                        $this->tag_close(null, $tagName);
 
214
                                                }
 
215
                                                break;
 
216
                                        case constant('XMLReader::TEXT'):
 
217
 
 
218
                                        case constant('XMLReader::CDATA'):
 
219
                                                $this->cdata(null, $xml->value);
 
220
                                                break;
 
221
                                }
 
222
                        }
 
223
                        if ($error = libxml_get_last_error())
 
224
                        {
 
225
                                $this->error_code = $error->code;
 
226
                                $this->error_string = $error->message;
 
227
                                $this->current_line = $error->line;
 
228
                                $this->current_column = $error->column;
 
229
                                return false;
 
230
                        }
 
231
                        else
 
232
                        {
 
233
                                return true;
 
234
                        }
 
235
                }
 
236
        }
 
237
 
 
238
        public function get_error_code()
 
239
        {
 
240
                return $this->error_code;
 
241
        }
 
242
 
 
243
        public function get_error_string()
 
244
        {
 
245
                return $this->error_string;
 
246
        }
 
247
 
 
248
        public function get_current_line()
 
249
        {
 
250
                return $this->current_line;
 
251
        }
 
252
 
 
253
        public function get_current_column()
 
254
        {
 
255
                return $this->current_column;
 
256
        }
 
257
 
 
258
        public function get_current_byte()
 
259
        {
 
260
                return $this->current_byte;
 
261
        }
 
262
 
 
263
        public function get_data()
 
264
        {
 
265
                return $this->data;
 
266
        }
 
267
 
 
268
        public function tag_open($parser, $tag, $attributes)
 
269
        {
 
270
                list($this->namespace[], $this->element[]) = $this->split_ns($tag);
 
271
 
 
272
                $attribs = array();
 
273
                foreach ($attributes as $name => $value)
 
274
                {
 
275
                        list($attrib_namespace, $attribute) = $this->split_ns($name);
 
276
                        $attribs[$attrib_namespace][$attribute] = $value;
 
277
                }
 
278
 
 
279
                if (isset($attribs[SIMPLEPIE_NAMESPACE_XML]['base']))
 
280
                {
 
281
                        $base = $this->registry->call('Misc', 'absolutize_url', array($attribs[SIMPLEPIE_NAMESPACE_XML]['base'], end($this->xml_base)));
 
282
                        if ($base !== false)
 
283
                        {
 
284
                                $this->xml_base[] = $base;
 
285
                                $this->xml_base_explicit[] = true;
 
286
                        }
 
287
                }
 
288
                else
 
289
                {
 
290
                        $this->xml_base[] = end($this->xml_base);
 
291
                        $this->xml_base_explicit[] = end($this->xml_base_explicit);
 
292
                }
 
293
 
 
294
                if (isset($attribs[SIMPLEPIE_NAMESPACE_XML]['lang']))
 
295
                {
 
296
                        $this->xml_lang[] = $attribs[SIMPLEPIE_NAMESPACE_XML]['lang'];
 
297
                }
 
298
                else
 
299
                {
 
300
                        $this->xml_lang[] = end($this->xml_lang);
 
301
                }
 
302
 
 
303
                if ($this->current_xhtml_construct >= 0)
 
304
                {
 
305
                        $this->current_xhtml_construct++;
 
306
                        if (end($this->namespace) === SIMPLEPIE_NAMESPACE_XHTML)
 
307
                        {
 
308
                                $this->data['data'] .= '<' . end($this->element);
 
309
                                if (isset($attribs['']))
 
310
                                {
 
311
                                        foreach ($attribs[''] as $name => $value)
 
312
                                        {
 
313
                                                $this->data['data'] .= ' ' . $name . '="' . htmlspecialchars($value, ENT_COMPAT, $this->encoding) . '"';
 
314
                                        }
 
315
                                }
 
316
                                $this->data['data'] .= '>';
 
317
                        }
 
318
                }
 
319
                else
 
320
                {
 
321
                        $this->datas[] =& $this->data;
 
322
                        $this->data =& $this->data['child'][end($this->namespace)][end($this->element)][];
 
323
                        $this->data = array('data' => '', 'attribs' => $attribs, 'xml_base' => end($this->xml_base), 'xml_base_explicit' => end($this->xml_base_explicit), 'xml_lang' => end($this->xml_lang));
 
324
                        if ((end($this->namespace) === SIMPLEPIE_NAMESPACE_ATOM_03 && in_array(end($this->element), array('title', 'tagline', 'copyright', 'info', 'summary', 'content')) && isset($attribs['']['mode']) && $attribs['']['mode'] === 'xml')
 
325
                        || (end($this->namespace) === SIMPLEPIE_NAMESPACE_ATOM_10 && in_array(end($this->element), array('rights', 'subtitle', 'summary', 'info', 'title', 'content')) && isset($attribs['']['type']) && $attribs['']['type'] === 'xhtml')
 
326
                        || (end($this->namespace) === SIMPLEPIE_NAMESPACE_RSS_20 && in_array(end($this->element), array('title')))
 
327
                        || (end($this->namespace) === SIMPLEPIE_NAMESPACE_RSS_090 && in_array(end($this->element), array('title')))
 
328
                        || (end($this->namespace) === SIMPLEPIE_NAMESPACE_RSS_10 && in_array(end($this->element), array('title'))))
 
329
                        {
 
330
                                $this->current_xhtml_construct = 0;
 
331
                        }
 
332
                }
 
333
        }
 
334
 
 
335
        public function cdata($parser, $cdata)
 
336
        {
 
337
                if ($this->current_xhtml_construct >= 0)
 
338
                {
 
339
                        $this->data['data'] .= htmlspecialchars($cdata, ENT_QUOTES, $this->encoding);
 
340
                }
 
341
                else
 
342
                {
 
343
                        $this->data['data'] .= $cdata;
 
344
                }
 
345
        }
 
346
 
 
347
        public function tag_close($parser, $tag)
 
348
        {
 
349
                if ($this->current_xhtml_construct >= 0)
 
350
                {
 
351
                        $this->current_xhtml_construct--;
 
352
                        if (end($this->namespace) === SIMPLEPIE_NAMESPACE_XHTML && !in_array(end($this->element), array('area', 'base', 'basefont', 'br', 'col', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param')))
 
353
                        {
 
354
                                $this->data['data'] .= '</' . end($this->element) . '>';
 
355
                        }
 
356
                }
 
357
                if ($this->current_xhtml_construct === -1)
 
358
                {
 
359
                        $this->data =& $this->datas[count($this->datas) - 1];
 
360
                        array_pop($this->datas);
 
361
                }
 
362
 
 
363
                array_pop($this->element);
 
364
                array_pop($this->namespace);
 
365
                array_pop($this->xml_base);
 
366
                array_pop($this->xml_base_explicit);
 
367
                array_pop($this->xml_lang);
 
368
        }
 
369
 
 
370
        public function split_ns($string)
 
371
        {
 
372
                static $cache = array();
 
373
                if (!isset($cache[$string]))
 
374
                {
 
375
                        if ($pos = strpos($string, $this->separator))
 
376
                        {
 
377
                                static $separator_length;
 
378
                                if (!$separator_length)
 
379
                                {
 
380
                                        $separator_length = strlen($this->separator);
 
381
                                }
 
382
                                $namespace = substr($string, 0, $pos);
 
383
                                $local_name = substr($string, $pos + $separator_length);
 
384
                                if (strtolower($namespace) === SIMPLEPIE_NAMESPACE_ITUNES)
 
385
                                {
 
386
                                        $namespace = SIMPLEPIE_NAMESPACE_ITUNES;
 
387
                                }
 
388
 
 
389
                                // Normalize the Media RSS namespaces
 
390
                                if ($namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG ||
 
391
                                        $namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG2 ||
 
392
                                        $namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG3 ||
 
393
                                        $namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG4 ||
 
394
                                        $namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG5 )
 
395
                                {
 
396
                                        $namespace = SIMPLEPIE_NAMESPACE_MEDIARSS;
 
397
                                }
 
398
                                $cache[$string] = array($namespace, $local_name);
 
399
                        }
 
400
                        else
 
401
                        {
 
402
                                $cache[$string] = array('', $string);
 
403
                        }
 
404
                }
 
405
                return $cache[$string];
 
406
        }
 
407
}