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Viewing changes to wp-includes/SimplePie/XML/Declaration/Parser.php

  • 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/XML/Declaration/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
/**
 
47
 * Parses the XML Declaration
 
48
 *
 
49
 * @package SimplePie
 
50
 * @subpackage Parsing
 
51
 */
 
52
class SimplePie_XML_Declaration_Parser
 
53
{
 
54
        /**
 
55
         * XML Version
 
56
         *
 
57
         * @access public
 
58
         * @var string
 
59
         */
 
60
        var $version = '1.0';
 
61
 
 
62
        /**
 
63
         * Encoding
 
64
         *
 
65
         * @access public
 
66
         * @var string
 
67
         */
 
68
        var $encoding = 'UTF-8';
 
69
 
 
70
        /**
 
71
         * Standalone
 
72
         *
 
73
         * @access public
 
74
         * @var bool
 
75
         */
 
76
        var $standalone = false;
 
77
 
 
78
        /**
 
79
         * Current state of the state machine
 
80
         *
 
81
         * @access private
 
82
         * @var string
 
83
         */
 
84
        var $state = 'before_version_name';
 
85
 
 
86
        /**
 
87
         * Input data
 
88
         *
 
89
         * @access private
 
90
         * @var string
 
91
         */
 
92
        var $data = '';
 
93
 
 
94
        /**
 
95
         * Input data length (to avoid calling strlen() everytime this is needed)
 
96
         *
 
97
         * @access private
 
98
         * @var int
 
99
         */
 
100
        var $data_length = 0;
 
101
 
 
102
        /**
 
103
         * Current position of the pointer
 
104
         *
 
105
         * @var int
 
106
         * @access private
 
107
         */
 
108
        var $position = 0;
 
109
 
 
110
        /**
 
111
         * Create an instance of the class with the input data
 
112
         *
 
113
         * @access public
 
114
         * @param string $data Input data
 
115
         */
 
116
        public function __construct($data)
 
117
        {
 
118
                $this->data = $data;
 
119
                $this->data_length = strlen($this->data);
 
120
        }
 
121
 
 
122
        /**
 
123
         * Parse the input data
 
124
         *
 
125
         * @access public
 
126
         * @return bool true on success, false on failure
 
127
         */
 
128
        public function parse()
 
129
        {
 
130
                while ($this->state && $this->state !== 'emit' && $this->has_data())
 
131
                {
 
132
                        $state = $this->state;
 
133
                        $this->$state();
 
134
                }
 
135
                $this->data = '';
 
136
                if ($this->state === 'emit')
 
137
                {
 
138
                        return true;
 
139
                }
 
140
                else
 
141
                {
 
142
                        $this->version = '';
 
143
                        $this->encoding = '';
 
144
                        $this->standalone = '';
 
145
                        return false;
 
146
                }
 
147
        }
 
148
 
 
149
        /**
 
150
         * Check whether there is data beyond the pointer
 
151
         *
 
152
         * @access private
 
153
         * @return bool true if there is further data, false if not
 
154
         */
 
155
        public function has_data()
 
156
        {
 
157
                return (bool) ($this->position < $this->data_length);
 
158
        }
 
159
 
 
160
        /**
 
161
         * Advance past any whitespace
 
162
         *
 
163
         * @return int Number of whitespace characters passed
 
164
         */
 
165
        public function skip_whitespace()
 
166
        {
 
167
                $whitespace = strspn($this->data, "\x09\x0A\x0D\x20", $this->position);
 
168
                $this->position += $whitespace;
 
169
                return $whitespace;
 
170
        }
 
171
 
 
172
        /**
 
173
         * Read value
 
174
         */
 
175
        public function get_value()
 
176
        {
 
177
                $quote = substr($this->data, $this->position, 1);
 
178
                if ($quote === '"' || $quote === "'")
 
179
                {
 
180
                        $this->position++;
 
181
                        $len = strcspn($this->data, $quote, $this->position);
 
182
                        if ($this->has_data())
 
183
                        {
 
184
                                $value = substr($this->data, $this->position, $len);
 
185
                                $this->position += $len + 1;
 
186
                                return $value;
 
187
                        }
 
188
                }
 
189
                return false;
 
190
        }
 
191
 
 
192
        public function before_version_name()
 
193
        {
 
194
                if ($this->skip_whitespace())
 
195
                {
 
196
                        $this->state = 'version_name';
 
197
                }
 
198
                else
 
199
                {
 
200
                        $this->state = false;
 
201
                }
 
202
        }
 
203
 
 
204
        public function version_name()
 
205
        {
 
206
                if (substr($this->data, $this->position, 7) === 'version')
 
207
                {
 
208
                        $this->position += 7;
 
209
                        $this->skip_whitespace();
 
210
                        $this->state = 'version_equals';
 
211
                }
 
212
                else
 
213
                {
 
214
                        $this->state = false;
 
215
                }
 
216
        }
 
217
 
 
218
        public function version_equals()
 
219
        {
 
220
                if (substr($this->data, $this->position, 1) === '=')
 
221
                {
 
222
                        $this->position++;
 
223
                        $this->skip_whitespace();
 
224
                        $this->state = 'version_value';
 
225
                }
 
226
                else
 
227
                {
 
228
                        $this->state = false;
 
229
                }
 
230
        }
 
231
 
 
232
        public function version_value()
 
233
        {
 
234
                if ($this->version = $this->get_value())
 
235
                {
 
236
                        $this->skip_whitespace();
 
237
                        if ($this->has_data())
 
238
                        {
 
239
                                $this->state = 'encoding_name';
 
240
                        }
 
241
                        else
 
242
                        {
 
243
                                $this->state = 'emit';
 
244
                        }
 
245
                }
 
246
                else
 
247
                {
 
248
                        $this->state = false;
 
249
                }
 
250
        }
 
251
 
 
252
        public function encoding_name()
 
253
        {
 
254
                if (substr($this->data, $this->position, 8) === 'encoding')
 
255
                {
 
256
                        $this->position += 8;
 
257
                        $this->skip_whitespace();
 
258
                        $this->state = 'encoding_equals';
 
259
                }
 
260
                else
 
261
                {
 
262
                        $this->state = 'standalone_name';
 
263
                }
 
264
        }
 
265
 
 
266
        public function encoding_equals()
 
267
        {
 
268
                if (substr($this->data, $this->position, 1) === '=')
 
269
                {
 
270
                        $this->position++;
 
271
                        $this->skip_whitespace();
 
272
                        $this->state = 'encoding_value';
 
273
                }
 
274
                else
 
275
                {
 
276
                        $this->state = false;
 
277
                }
 
278
        }
 
279
 
 
280
        public function encoding_value()
 
281
        {
 
282
                if ($this->encoding = $this->get_value())
 
283
                {
 
284
                        $this->skip_whitespace();
 
285
                        if ($this->has_data())
 
286
                        {
 
287
                                $this->state = 'standalone_name';
 
288
                        }
 
289
                        else
 
290
                        {
 
291
                                $this->state = 'emit';
 
292
                        }
 
293
                }
 
294
                else
 
295
                {
 
296
                        $this->state = false;
 
297
                }
 
298
        }
 
299
 
 
300
        public function standalone_name()
 
301
        {
 
302
                if (substr($this->data, $this->position, 10) === 'standalone')
 
303
                {
 
304
                        $this->position += 10;
 
305
                        $this->skip_whitespace();
 
306
                        $this->state = 'standalone_equals';
 
307
                }
 
308
                else
 
309
                {
 
310
                        $this->state = false;
 
311
                }
 
312
        }
 
313
 
 
314
        public function standalone_equals()
 
315
        {
 
316
                if (substr($this->data, $this->position, 1) === '=')
 
317
                {
 
318
                        $this->position++;
 
319
                        $this->skip_whitespace();
 
320
                        $this->state = 'standalone_value';
 
321
                }
 
322
                else
 
323
                {
 
324
                        $this->state = false;
 
325
                }
 
326
        }
 
327
 
 
328
        public function standalone_value()
 
329
        {
 
330
                if ($standalone = $this->get_value())
 
331
                {
 
332
                        switch ($standalone)
 
333
                        {
 
334
                                case 'yes':
 
335
                                        $this->standalone = true;
 
336
                                        break;
 
337
 
 
338
                                case 'no':
 
339
                                        $this->standalone = false;
 
340
                                        break;
 
341
 
 
342
                                default:
 
343
                                        $this->state = false;
 
344
                                        return;
 
345
                        }
 
346
 
 
347
                        $this->skip_whitespace();
 
348
                        if ($this->has_data())
 
349
                        {
 
350
                                $this->state = false;
 
351
                        }
 
352
                        else
 
353
                        {
 
354
                                $this->state = 'emit';
 
355
                        }
 
356
                }
 
357
                else
 
358
                {
 
359
                        $this->state = false;
 
360
                }
 
361
        }
 
362
}