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1 <?php |
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2 /** |
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3 * SimplePie |
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4 * |
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5 * A PHP-Based RSS and Atom Feed Framework. |
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6 * Takes the hard work out of managing a complete RSS/Atom solution. |
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7 * |
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8 * Copyright (c) 2004-2012, Ryan Parman, Geoffrey Sneddon, Ryan McCue, and contributors |
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9 * All rights reserved. |
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10 * |
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11 * Redistribution and use in source and binary forms, with or without modification, are |
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12 * permitted provided that the following conditions are met: |
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13 * |
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14 * * Redistributions of source code must retain the above copyright notice, this list of |
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15 * conditions and the following disclaimer. |
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16 * |
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17 * * Redistributions in binary form must reproduce the above copyright notice, this list |
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18 * of conditions and the following disclaimer in the documentation and/or other materials |
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19 * provided with the distribution. |
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20 * |
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21 * * Neither the name of the SimplePie Team nor the names of its contributors may be used |
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22 * to endorse or promote products derived from this software without specific prior |
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23 * written permission. |
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24 * |
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25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS |
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26 * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY |
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27 * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS |
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28 * AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
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29 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR |
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30 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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31 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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32 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
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33 * POSSIBILITY OF SUCH DAMAGE. |
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34 * |
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35 * @package SimplePie |
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36 * @version 1.3.1 |
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37 * @copyright 2004-2012 Ryan Parman, Geoffrey Sneddon, Ryan McCue |
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38 * @author Ryan Parman |
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39 * @author Geoffrey Sneddon |
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40 * @author Ryan McCue |
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41 * @link http://simplepie.org/ SimplePie |
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42 * @license http://www.opensource.org/licenses/bsd-license.php BSD License |
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43 */ |
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44 |
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45 |
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46 /** |
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47 * Parses the XML Declaration |
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48 * |
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49 * @package SimplePie |
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50 * @subpackage Parsing |
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51 */ |
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52 class SimplePie_XML_Declaration_Parser |
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53 { |
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54 /** |
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55 * XML Version |
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56 * |
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57 * @access public |
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58 * @var string |
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59 */ |
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60 var $version = '1.0'; |
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61 |
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62 /** |
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63 * Encoding |
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64 * |
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65 * @access public |
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66 * @var string |
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67 */ |
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68 var $encoding = 'UTF-8'; |
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69 |
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70 /** |
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71 * Standalone |
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72 * |
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73 * @access public |
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74 * @var bool |
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75 */ |
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76 var $standalone = false; |
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77 |
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78 /** |
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79 * Current state of the state machine |
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80 * |
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81 * @access private |
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82 * @var string |
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83 */ |
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84 var $state = 'before_version_name'; |
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85 |
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86 /** |
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87 * Input data |
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88 * |
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89 * @access private |
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90 * @var string |
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91 */ |
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92 var $data = ''; |
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93 |
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94 /** |
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95 * Input data length (to avoid calling strlen() everytime this is needed) |
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96 * |
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97 * @access private |
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98 * @var int |
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99 */ |
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100 var $data_length = 0; |
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101 |
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102 /** |
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103 * Current position of the pointer |
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104 * |
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105 * @var int |
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106 * @access private |
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107 */ |
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108 var $position = 0; |
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109 |
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110 /** |
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111 * Create an instance of the class with the input data |
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112 * |
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113 * @access public |
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114 * @param string $data Input data |
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115 */ |
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116 public function __construct($data) |
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117 { |
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118 $this->data = $data; |
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119 $this->data_length = strlen($this->data); |
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120 } |
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121 |
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122 /** |
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123 * Parse the input data |
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124 * |
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125 * @access public |
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126 * @return bool true on success, false on failure |
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127 */ |
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128 public function parse() |
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129 { |
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130 while ($this->state && $this->state !== 'emit' && $this->has_data()) |
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131 { |
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132 $state = $this->state; |
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133 $this->$state(); |
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134 } |
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135 $this->data = ''; |
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136 if ($this->state === 'emit') |
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137 { |
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138 return true; |
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139 } |
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140 else |
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141 { |
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142 $this->version = ''; |
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143 $this->encoding = ''; |
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144 $this->standalone = ''; |
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145 return false; |
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146 } |
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147 } |
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148 |
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149 /** |
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150 * Check whether there is data beyond the pointer |
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151 * |
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152 * @access private |
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153 * @return bool true if there is further data, false if not |
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154 */ |
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155 public function has_data() |
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156 { |
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157 return (bool) ($this->position < $this->data_length); |
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158 } |
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159 |
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160 /** |
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161 * Advance past any whitespace |
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162 * |
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163 * @return int Number of whitespace characters passed |
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164 */ |
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165 public function skip_whitespace() |
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166 { |
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167 $whitespace = strspn($this->data, "\x09\x0A\x0D\x20", $this->position); |
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168 $this->position += $whitespace; |
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169 return $whitespace; |
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170 } |
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171 |
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172 /** |
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173 * Read value |
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174 */ |
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175 public function get_value() |
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176 { |
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177 $quote = substr($this->data, $this->position, 1); |
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178 if ($quote === '"' || $quote === "'") |
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179 { |
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180 $this->position++; |
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181 $len = strcspn($this->data, $quote, $this->position); |
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182 if ($this->has_data()) |
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183 { |
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184 $value = substr($this->data, $this->position, $len); |
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185 $this->position += $len + 1; |
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186 return $value; |
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187 } |
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188 } |
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189 return false; |
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190 } |
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191 |
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192 public function before_version_name() |
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193 { |
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194 if ($this->skip_whitespace()) |
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195 { |
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196 $this->state = 'version_name'; |
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197 } |
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198 else |
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199 { |
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200 $this->state = false; |
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201 } |
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202 } |
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203 |
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204 public function version_name() |
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205 { |
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206 if (substr($this->data, $this->position, 7) === 'version') |
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207 { |
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208 $this->position += 7; |
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209 $this->skip_whitespace(); |
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210 $this->state = 'version_equals'; |
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211 } |
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212 else |
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213 { |
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214 $this->state = false; |
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215 } |
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216 } |
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217 |
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218 public function version_equals() |
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219 { |
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220 if (substr($this->data, $this->position, 1) === '=') |
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221 { |
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222 $this->position++; |
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223 $this->skip_whitespace(); |
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224 $this->state = 'version_value'; |
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225 } |
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226 else |
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227 { |
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228 $this->state = false; |
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229 } |
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230 } |
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231 |
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232 public function version_value() |
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233 { |
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234 if ($this->version = $this->get_value()) |
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235 { |
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236 $this->skip_whitespace(); |
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237 if ($this->has_data()) |
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238 { |
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239 $this->state = 'encoding_name'; |
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240 } |
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241 else |
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242 { |
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243 $this->state = 'emit'; |
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244 } |
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245 } |
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246 else |
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247 { |
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248 $this->state = false; |
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249 } |
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250 } |
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251 |
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252 public function encoding_name() |
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253 { |
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254 if (substr($this->data, $this->position, 8) === 'encoding') |
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255 { |
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256 $this->position += 8; |
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257 $this->skip_whitespace(); |
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258 $this->state = 'encoding_equals'; |
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259 } |
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260 else |
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261 { |
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262 $this->state = 'standalone_name'; |
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263 } |
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264 } |
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265 |
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266 public function encoding_equals() |
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267 { |
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268 if (substr($this->data, $this->position, 1) === '=') |
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269 { |
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270 $this->position++; |
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271 $this->skip_whitespace(); |
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272 $this->state = 'encoding_value'; |
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273 } |
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274 else |
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275 { |
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276 $this->state = false; |
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277 } |
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278 } |
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279 |
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280 public function encoding_value() |
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281 { |
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282 if ($this->encoding = $this->get_value()) |
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283 { |
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284 $this->skip_whitespace(); |
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285 if ($this->has_data()) |
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286 { |
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287 $this->state = 'standalone_name'; |
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288 } |
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289 else |
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290 { |
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291 $this->state = 'emit'; |
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292 } |
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293 } |
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294 else |
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295 { |
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296 $this->state = false; |
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297 } |
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298 } |
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299 |
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300 public function standalone_name() |
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301 { |
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302 if (substr($this->data, $this->position, 10) === 'standalone') |
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303 { |
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304 $this->position += 10; |
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305 $this->skip_whitespace(); |
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306 $this->state = 'standalone_equals'; |
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307 } |
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308 else |
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309 { |
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310 $this->state = false; |
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311 } |
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312 } |
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313 |
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314 public function standalone_equals() |
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315 { |
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316 if (substr($this->data, $this->position, 1) === '=') |
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317 { |
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318 $this->position++; |
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319 $this->skip_whitespace(); |
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320 $this->state = 'standalone_value'; |
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321 } |
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322 else |
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323 { |
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324 $this->state = false; |
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325 } |
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326 } |
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327 |
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328 public function standalone_value() |
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329 { |
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330 if ($standalone = $this->get_value()) |
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331 { |
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332 switch ($standalone) |
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333 { |
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334 case 'yes': |
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335 $this->standalone = true; |
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336 break; |
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337 |
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338 case 'no': |
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339 $this->standalone = false; |
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340 break; |
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341 |
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342 default: |
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343 $this->state = false; |
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344 return; |
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345 } |
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346 |
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347 $this->skip_whitespace(); |
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348 if ($this->has_data()) |
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349 { |
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350 $this->state = false; |
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351 } |
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352 else |
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353 { |
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354 $this->state = 'emit'; |
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355 } |
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356 } |
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357 else |
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358 { |
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359 $this->state = false; |
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360 } |
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361 } |
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362 } |