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
 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:             $this->xml_base[] = $this->registry->call('Misc', 'absolutize_url', array($attribs[SIMPLEPIE_NAMESPACE_XML]['base'], end($this->xml_base)));
282:             $this->xml_base_explicit[] = true;
283:         }
284:         else
285:         {
286:             $this->xml_base[] = end($this->xml_base);
287:             $this->xml_base_explicit[] = end($this->xml_base_explicit);
288:         }
289: 
290:         if (isset($attribs[SIMPLEPIE_NAMESPACE_XML]['lang']))
291:         {
292:             $this->xml_lang[] = $attribs[SIMPLEPIE_NAMESPACE_XML]['lang'];
293:         }
294:         else
295:         {
296:             $this->xml_lang[] = end($this->xml_lang);
297:         }
298: 
299:         if ($this->current_xhtml_construct >= 0)
300:         {
301:             $this->current_xhtml_construct++;
302:             if (end($this->namespace) === SIMPLEPIE_NAMESPACE_XHTML)
303:             {
304:                 $this->data['data'] .= '<' . end($this->element);
305:                 if (isset($attribs['']))
306:                 {
307:                     foreach ($attribs[''] as $name => $value)
308:                     {
309:                         $this->data['data'] .= ' ' . $name . '="' . htmlspecialchars($value, ENT_COMPAT, $this->encoding) . '"';
310:                     }
311:                 }
312:                 $this->data['data'] .= '>';
313:             }
314:         }
315:         else
316:         {
317:             $this->datas[] =& $this->data;
318:             $this->data =& $this->data['child'][end($this->namespace)][end($this->element)][];
319:             $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));
320:             if ((end($this->namespace) === SIMPLEPIE_NAMESPACE_ATOM_03 && in_array(end($this->element), array('title', 'tagline', 'copyright', 'info', 'summary', 'content')) && isset($attribs['']['mode']) && $attribs['']['mode'] === 'xml')
321:             || (end($this->namespace) === SIMPLEPIE_NAMESPACE_ATOM_10 && in_array(end($this->element), array('rights', 'subtitle', 'summary', 'info', 'title', 'content')) && isset($attribs['']['type']) && $attribs['']['type'] === 'xhtml')
322:             || (end($this->namespace) === SIMPLEPIE_NAMESPACE_RSS_20 && in_array(end($this->element), array('title')))
323:             || (end($this->namespace) === SIMPLEPIE_NAMESPACE_RSS_090 && in_array(end($this->element), array('title')))
324:             || (end($this->namespace) === SIMPLEPIE_NAMESPACE_RSS_10 && in_array(end($this->element), array('title'))))
325:             {
326:                 $this->current_xhtml_construct = 0;
327:             }
328:         }
329:     }
330: 
331:     public function cdata($parser, $cdata)
332:     {
333:         if ($this->current_xhtml_construct >= 0)
334:         {
335:             $this->data['data'] .= htmlspecialchars($cdata, ENT_QUOTES, $this->encoding);
336:         }
337:         else
338:         {
339:             $this->data['data'] .= $cdata;
340:         }
341:     }
342: 
343:     public function tag_close($parser, $tag)
344:     {
345:         if ($this->current_xhtml_construct >= 0)
346:         {
347:             $this->current_xhtml_construct--;
348:             if (end($this->namespace) === SIMPLEPIE_NAMESPACE_XHTML && !in_array(end($this->element), array('area', 'base', 'basefont', 'br', 'col', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param')))
349:             {
350:                 $this->data['data'] .= '</' . end($this->element) . '>';
351:             }
352:         }
353:         if ($this->current_xhtml_construct === -1)
354:         {
355:             $this->data =& $this->datas[count($this->datas) - 1];
356:             array_pop($this->datas);
357:         }
358: 
359:         array_pop($this->element);
360:         array_pop($this->namespace);
361:         array_pop($this->xml_base);
362:         array_pop($this->xml_base_explicit);
363:         array_pop($this->xml_lang);
364:     }
365: 
366:     public function split_ns($string)
367:     {
368:         static $cache = array();
369:         if (!isset($cache[$string]))
370:         {
371:             if ($pos = strpos($string, $this->separator))
372:             {
373:                 static $separator_length;
374:                 if (!$separator_length)
375:                 {
376:                     $separator_length = strlen($this->separator);
377:                 }
378:                 $namespace = substr($string, 0, $pos);
379:                 $local_name = substr($string, $pos + $separator_length);
380:                 if (strtolower($namespace) === SIMPLEPIE_NAMESPACE_ITUNES)
381:                 {
382:                     $namespace = SIMPLEPIE_NAMESPACE_ITUNES;
383:                 }
384: 
385:                 // Normalize the Media RSS namespaces
386:                 if ($namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG ||
387:                     $namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG2 ||
388:                     $namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG3 ||
389:                     $namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG4 ||
390:                     $namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG5 )
391:                 {
392:                     $namespace = SIMPLEPIE_NAMESPACE_MEDIARSS;
393:                 }
394:                 $cache[$string] = array($namespace, $local_name);
395:             }
396:             else
397:             {
398:                 $cache[$string] = array('', $string);
399:             }
400:         }
401:         return $cache[$string];
402:     }
403: }
404: