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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) 2004-2009, 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-dev | |
37 | * @copyright 2004-2010 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 | * @todo phpDoc comments | |
44 | */ | |
45 | ||
46 | ||
47 | /** | |
48 | * Parses the XML Declaration | |
49 | * | |
50 | * @package SimplePie | |
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 | } |