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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) 2004-2016, Ryan Parman, Sam 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 * @copyright 2004-2016 Ryan Parman, Sam Sneddon, Ryan McCue 37 * @author Ryan Parman 38 * @author Sam Sneddon 39 * @author Ryan McCue 40 * @link http://simplepie.org/ SimplePie 41 * @license http://www.opensource.org/licenses/bsd-license.php BSD License 42 */ 43 44 45 /** 46 * Parses the XML Declaration 47 * 48 * @package SimplePie 49 * @subpackage Parsing 50 */ 51 class SimplePie_XML_Declaration_Parser 52 { 53 /** 54 * XML Version 55 * 56 * @access public 57 * @var string 58 */ 59 var $version = '1.0'; 60 61 /** 62 * Encoding 63 * 64 * @access public 65 * @var string 66 */ 67 var $encoding = 'UTF-8'; 68 69 /** 70 * Standalone 71 * 72 * @access public 73 * @var bool 74 */ 75 var $standalone = false; 76 77 /** 78 * Current state of the state machine 79 * 80 * @access private 81 * @var string 82 */ 83 var $state = 'before_version_name'; 84 85 /** 86 * Input data 87 * 88 * @access private 89 * @var string 90 */ 91 var $data = ''; 92 93 /** 94 * Input data length (to avoid calling strlen() everytime this is needed) 95 * 96 * @access private 97 * @var int 98 */ 99 var $data_length = 0; 100 101 /** 102 * Current position of the pointer 103 * 104 * @var int 105 * @access private 106 */ 107 var $position = 0; 108 109 /** 110 * Create an instance of the class with the input data 111 * 112 * @access public 113 * @param string $data Input data 114 */ 115 public function __construct($data) 116 { 117 $this->data = $data; 118 $this->data_length = strlen($this->data); 119 } 120 121 /** 122 * Parse the input data 123 * 124 * @access public 125 * @return bool true on success, false on failure 126 */ 127 public function parse() 128 { 129 while ($this->state && $this->state !== 'emit' && $this->has_data()) 130 { 131 $state = $this->state; 132 $this->$state(); 133 } 134 $this->data = ''; 135 if ($this->state === 'emit') 136 { 137 return true; 138 } 139 140 $this->version = ''; 141 $this->encoding = ''; 142 $this->standalone = ''; 143 return false; 144 } 145 146 /** 147 * Check whether there is data beyond the pointer 148 * 149 * @access private 150 * @return bool true if there is further data, false if not 151 */ 152 public function has_data() 153 { 154 return (bool) ($this->position < $this->data_length); 155 } 156 157 /** 158 * Advance past any whitespace 159 * 160 * @return int Number of whitespace characters passed 161 */ 162 public function skip_whitespace() 163 { 164 $whitespace = strspn($this->data, "\x09\x0A\x0D\x20", $this->position); 165 $this->position += $whitespace; 166 return $whitespace; 167 } 168 169 /** 170 * Read value 171 */ 172 public function get_value() 173 { 174 $quote = substr($this->data, $this->position, 1); 175 if ($quote === '"' || $quote === "'") 176 { 177 $this->position++; 178 $len = strcspn($this->data, $quote, $this->position); 179 if ($this->has_data()) 180 { 181 $value = substr($this->data, $this->position, $len); 182 $this->position += $len + 1; 183 return $value; 184 } 185 } 186 return false; 187 } 188 189 public function before_version_name() 190 { 191 if ($this->skip_whitespace()) 192 { 193 $this->state = 'version_name'; 194 } 195 else 196 { 197 $this->state = false; 198 } 199 } 200 201 public function version_name() 202 { 203 if (substr($this->data, $this->position, 7) === 'version') 204 { 205 $this->position += 7; 206 $this->skip_whitespace(); 207 $this->state = 'version_equals'; 208 } 209 else 210 { 211 $this->state = false; 212 } 213 } 214 215 public function version_equals() 216 { 217 if (substr($this->data, $this->position, 1) === '=') 218 { 219 $this->position++; 220 $this->skip_whitespace(); 221 $this->state = 'version_value'; 222 } 223 else 224 { 225 $this->state = false; 226 } 227 } 228 229 public function version_value() 230 { 231 if ($this->version = $this->get_value()) 232 { 233 $this->skip_whitespace(); 234 if ($this->has_data()) 235 { 236 $this->state = 'encoding_name'; 237 } 238 else 239 { 240 $this->state = 'emit'; 241 } 242 } 243 else 244 { 245 $this->state = false; 246 } 247 } 248 249 public function encoding_name() 250 { 251 if (substr($this->data, $this->position, 8) === 'encoding') 252 { 253 $this->position += 8; 254 $this->skip_whitespace(); 255 $this->state = 'encoding_equals'; 256 } 257 else 258 { 259 $this->state = 'standalone_name'; 260 } 261 } 262 263 public function encoding_equals() 264 { 265 if (substr($this->data, $this->position, 1) === '=') 266 { 267 $this->position++; 268 $this->skip_whitespace(); 269 $this->state = 'encoding_value'; 270 } 271 else 272 { 273 $this->state = false; 274 } 275 } 276 277 public function encoding_value() 278 { 279 if ($this->encoding = $this->get_value()) 280 { 281 $this->skip_whitespace(); 282 if ($this->has_data()) 283 { 284 $this->state = 'standalone_name'; 285 } 286 else 287 { 288 $this->state = 'emit'; 289 } 290 } 291 else 292 { 293 $this->state = false; 294 } 295 } 296 297 public function standalone_name() 298 { 299 if (substr($this->data, $this->position, 10) === 'standalone') 300 { 301 $this->position += 10; 302 $this->skip_whitespace(); 303 $this->state = 'standalone_equals'; 304 } 305 else 306 { 307 $this->state = false; 308 } 309 } 310 311 public function standalone_equals() 312 { 313 if (substr($this->data, $this->position, 1) === '=') 314 { 315 $this->position++; 316 $this->skip_whitespace(); 317 $this->state = 'standalone_value'; 318 } 319 else 320 { 321 $this->state = false; 322 } 323 } 324 325 public function standalone_value() 326 { 327 if ($standalone = $this->get_value()) 328 { 329 switch ($standalone) 330 { 331 case 'yes': 332 $this->standalone = true; 333 break; 334 335 case 'no': 336 $this->standalone = false; 337 break; 338 339 default: 340 $this->state = false; 341 return; 342 } 343 344 $this->skip_whitespace(); 345 if ($this->has_data()) 346 { 347 $this->state = false; 348 } 349 else 350 { 351 $this->state = 'emit'; 352 } 353 } 354 else 355 { 356 $this->state = false; 357 } 358 } 359 }
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