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-dev
 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:  */
 53: class SimplePie_Parser
 54: {
 55:     var $error_code;
 56:     var $error_string;
 57:     var $current_line;
 58:     var $current_column;
 59:     var $current_byte;
 60:     var $separator = ' ';
 61:     var $namespace = array('');
 62:     var $element = array('');
 63:     var $xml_base = array('');
 64:     var $xml_base_explicit = array(false);
 65:     var $xml_lang = array('');
 66:     var $data = array();
 67:     var $datas = array(array());
 68:     var $current_xhtml_construct = -1;
 69:     var $encoding;
 70:     protected $registry;
 71: 
 72:     public function set_registry(SimplePie_Registry &$registry)
 73:     {
 74:         $this->registry = &$registry;
 75:     }
 76: 
 77:     public function parse(&$data, $encoding)
 78:     {
 79:         // Use UTF-8 if we get passed US-ASCII, as every US-ASCII character is a UTF-8 character
 80:         if (strtoupper($encoding) === 'US-ASCII')
 81:         {
 82:             $this->encoding = 'UTF-8';
 83:         }
 84:         else
 85:         {
 86:             $this->encoding = $encoding;
 87:         }
 88: 
 89:         // Strip BOM:
 90:         // UTF-32 Big Endian BOM
 91:         if (substr($data, 0, 4) === "\x00\x00\xFE\xFF")
 92:         {
 93:             $data = substr($data, 4);
 94:         }
 95:         // UTF-32 Little Endian BOM
 96:         elseif (substr($data, 0, 4) === "\xFF\xFE\x00\x00")
 97:         {
 98:             $data = substr($data, 4);
 99:         }
100:         // UTF-16 Big Endian BOM
101:         elseif (substr($data, 0, 2) === "\xFE\xFF")
102:         {
103:             $data = substr($data, 2);
104:         }
105:         // UTF-16 Little Endian BOM
106:         elseif (substr($data, 0, 2) === "\xFF\xFE")
107:         {
108:             $data = substr($data, 2);
109:         }
110:         // UTF-8 BOM
111:         elseif (substr($data, 0, 3) === "\xEF\xBB\xBF")
112:         {
113:             $data = substr($data, 3);
114:         }
115: 
116:         if (substr($data, 0, 5) === '<?xml' && strspn(substr($data, 5, 1), "\x09\x0A\x0D\x20") && ($pos = strpos($data, '?>')) !== false)
117:         {
118:             $declaration = $this->registry->create('XML_Declaration_Parser', array(substr($data, 5, $pos - 5)));
119:             if ($declaration->parse())
120:             {
121:                 $data = substr($data, $pos + 2);
122:                 $data = '<?xml version="' . $declaration->version . '" encoding="' . $encoding . '" standalone="' . (($declaration->standalone) ? 'yes' : 'no') . '"?>' . $data;
123:             }
124:             else
125:             {
126:                 $this->error_string = 'SimplePie bug! Please report this!';
127:                 return false;
128:             }
129:         }
130: 
131:         $return = true;
132: 
133:         static $xml_is_sane = null;
134:         if ($xml_is_sane === null)
135:         {
136:             $parser_check = xml_parser_create();
137:             xml_parse_into_struct($parser_check, '<foo>&amp;</foo>', $values);
138:             xml_parser_free($parser_check);
139:             $xml_is_sane = isset($values[0]['value']);
140:         }
141: 
142:         // Create the parser
143:         if ($xml_is_sane)
144:         {
145:             $xml = xml_parser_create_ns($this->encoding, $this->separator);
146:             xml_parser_set_option($xml, XML_OPTION_SKIP_WHITE, 1);
147:             xml_parser_set_option($xml, XML_OPTION_CASE_FOLDING, 0);
148:             xml_set_object($xml, $this);
149:             xml_set_character_data_handler($xml, 'cdata');
150:             xml_set_element_handler($xml, 'tag_open', 'tag_close');
151: 
152:             // Parse!
153:             if (!xml_parse($xml, $data, true))
154:             {
155:                 $this->error_code = xml_get_error_code($xml);
156:                 $this->error_string = xml_error_string($this->error_code);
157:                 $return = false;
158:             }
159:             $this->current_line = xml_get_current_line_number($xml);
160:             $this->current_column = xml_get_current_column_number($xml);
161:             $this->current_byte = xml_get_current_byte_index($xml);
162:             xml_parser_free($xml);
163:             return $return;
164:         }
165:         else
166:         {
167:             libxml_clear_errors();
168:             $xml = new XMLReader();
169:             $xml->xml($data);
170:             while (@$xml->read())
171:             {
172:                 switch ($xml->nodeType)
173:                 {
174: 
175:                     case constant('XMLReader::END_ELEMENT'):
176:                         if ($xml->namespaceURI !== '')
177:                         {
178:                             $tagName = $xml->namespaceURI . $this->separator . $xml->localName;
179:                         }
180:                         else
181:                         {
182:                             $tagName = $xml->localName;
183:                         }
184:                         $this->tag_close(null, $tagName);
185:                         break;
186:                     case constant('XMLReader::ELEMENT'):
187:                         $empty = $xml->isEmptyElement;
188:                         if ($xml->namespaceURI !== '')
189:                         {
190:                             $tagName = $xml->namespaceURI . $this->separator . $xml->localName;
191:                         }
192:                         else
193:                         {
194:                             $tagName = $xml->localName;
195:                         }
196:                         $attributes = array();
197:                         while ($xml->moveToNextAttribute())
198:                         {
199:                             if ($xml->namespaceURI !== '')
200:                             {
201:                                 $attrName = $xml->namespaceURI . $this->separator . $xml->localName;
202:                             }
203:                             else
204:                             {
205:                                 $attrName = $xml->localName;
206:                             }
207:                             $attributes[$attrName] = $xml->value;
208:                         }
209:                         $this->tag_open(null, $tagName, $attributes);
210:                         if ($empty)
211:                         {
212:                             $this->tag_close(null, $tagName);
213:                         }
214:                         break;
215:                     case constant('XMLReader::TEXT'):
216: 
217:                     case constant('XMLReader::CDATA'):
218:                         $this->cdata(null, $xml->value);
219:                         break;
220:                 }
221:             }
222:             if ($error = libxml_get_last_error())
223:             {
224:                 $this->error_code = $error->code;
225:                 $this->error_string = $error->message;
226:                 $this->current_line = $error->line;
227:                 $this->current_column = $error->column;
228:                 return false;
229:             }
230:             else
231:             {
232:                 return true;
233:             }
234:         }
235:     }
236: 
237:     public function get_error_code()
238:     {
239:         return $this->error_code;
240:     }
241: 
242:     public function get_error_string()
243:     {
244:         return $this->error_string;
245:     }
246: 
247:     public function get_current_line()
248:     {
249:         return $this->current_line;
250:     }
251: 
252:     public function get_current_column()
253:     {
254:         return $this->current_column;
255:     }
256: 
257:     public function get_current_byte()
258:     {
259:         return $this->current_byte;
260:     }
261: 
262:     public function get_data()
263:     {
264:         return $this->data;
265:     }
266: 
267:     public function tag_open($parser, $tag, $attributes)
268:     {
269:         list($this->namespace[], $this->element[]) = $this->split_ns($tag);
270: 
271:         $attribs = array();
272:         foreach ($attributes as $name => $value)
273:         {
274:             list($attrib_namespace, $attribute) = $this->split_ns($name);
275:             $attribs[$attrib_namespace][$attribute] = $value;
276:         }
277: 
278:         if (isset($attribs[SIMPLEPIE_NAMESPACE_XML]['base']))
279:         {
280:             $this->xml_base[] = $this->registry->call('Misc', 'absolutize_url', array($attribs[SIMPLEPIE_NAMESPACE_XML]['base'], end($this->xml_base)));
281:             $this->xml_base_explicit[] = true;
282:         }
283:         else
284:         {
285:             $this->xml_base[] = end($this->xml_base);
286:             $this->xml_base_explicit[] = end($this->xml_base_explicit);
287:         }
288: 
289:         if (isset($attribs[SIMPLEPIE_NAMESPACE_XML]['lang']))
290:         {
291:             $this->xml_lang[] = $attribs[SIMPLEPIE_NAMESPACE_XML]['lang'];
292:         }
293:         else
294:         {
295:             $this->xml_lang[] = end($this->xml_lang);
296:         }
297: 
298:         if ($this->current_xhtml_construct >= 0)
299:         {
300:             $this->current_xhtml_construct++;
301:             if (end($this->namespace) === SIMPLEPIE_NAMESPACE_XHTML)
302:             {
303:                 $this->data['data'] .= '<' . end($this->element);
304:                 if (isset($attribs['']))
305:                 {
306:                     foreach ($attribs[''] as $name => $value)
307:                     {
308:                         $this->data['data'] .= ' ' . $name . '="' . htmlspecialchars($value, ENT_COMPAT, $this->encoding) . '"';
309:                     }
310:                 }
311:                 $this->data['data'] .= '>';
312:             }
313:         }
314:         else
315:         {
316:             $this->datas[] =& $this->data;
317:             $this->data =& $this->data['child'][end($this->namespace)][end($this->element)][];
318:             $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));
319:             if ((end($this->namespace) === SIMPLEPIE_NAMESPACE_ATOM_03 && in_array(end($this->element), array('title', 'tagline', 'copyright', 'info', 'summary', 'content')) && isset($attribs['']['mode']) && $attribs['']['mode'] === 'xml')
320:             || (end($this->namespace) === SIMPLEPIE_NAMESPACE_ATOM_10 && in_array(end($this->element), array('rights', 'subtitle', 'summary', 'info', 'title', 'content')) && isset($attribs['']['type']) && $attribs['']['type'] === 'xhtml'))
321:             {
322:                 $this->current_xhtml_construct = 0;
323:             }
324:         }
325:     }
326: 
327:     public function cdata($parser, $cdata)
328:     {
329:         if ($this->current_xhtml_construct >= 0)
330:         {
331:             $this->data['data'] .= htmlspecialchars($cdata, ENT_QUOTES, $this->encoding);
332:         }
333:         else
334:         {
335:             $this->data['data'] .= $cdata;
336:         }
337:     }
338: 
339:     public function tag_close($parser, $tag)
340:     {
341:         if ($this->current_xhtml_construct >= 0)
342:         {
343:             $this->current_xhtml_construct--;
344:             if (end($this->namespace) === SIMPLEPIE_NAMESPACE_XHTML && !in_array(end($this->element), array('area', 'base', 'basefont', 'br', 'col', 'frame', 'hr', 'img', 'input', 'isindex', 'link', 'meta', 'param')))
345:             {
346:                 $this->data['data'] .= '</' . end($this->element) . '>';
347:             }
348:         }
349:         if ($this->current_xhtml_construct === -1)
350:         {
351:             $this->data =& $this->datas[count($this->datas) - 1];
352:             array_pop($this->datas);
353:         }
354: 
355:         array_pop($this->element);
356:         array_pop($this->namespace);
357:         array_pop($this->xml_base);
358:         array_pop($this->xml_base_explicit);
359:         array_pop($this->xml_lang);
360:     }
361: 
362:     public function split_ns($string)
363:     {
364:         static $cache = array();
365:         if (!isset($cache[$string]))
366:         {
367:             if ($pos = strpos($string, $this->separator))
368:             {
369:                 static $separator_length;
370:                 if (!$separator_length)
371:                 {
372:                     $separator_length = strlen($this->separator);
373:                 }
374:                 $namespace = substr($string, 0, $pos);
375:                 $local_name = substr($string, $pos + $separator_length);
376:                 if (strtolower($namespace) === SIMPLEPIE_NAMESPACE_ITUNES)
377:                 {
378:                     $namespace = SIMPLEPIE_NAMESPACE_ITUNES;
379:                 }
380: 
381:                 // Normalize the Media RSS namespaces
382:                 if ($namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG ||
383:                     $namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG2 ||
384:                     $namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG3 ||
385:                     $namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG4 ||
386:                     $namespace === SIMPLEPIE_NAMESPACE_MEDIARSS_WRONG5 )
387:                 {
388:                     $namespace = SIMPLEPIE_NAMESPACE_MEDIARSS;
389:                 }
390:                 $cache[$string] = array($namespace, $local_name);
391:             }
392:             else
393:             {
394:                 $cache[$string] = array('', $string);
395:             }
396:         }
397:         return $cache[$string];
398:     }
399: }
400: