Complex classes like AbstractDiff often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes. You can also have a look at the cohesion graph to spot any un-connected, or weakly-connected components.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use AbstractDiff, and based on these observations, apply Extract Interface, too.
1 | <?php |
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8 | abstract class AbstractDiff |
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9 | { |
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10 | /** |
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11 | * @var array |
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12 | * |
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13 | * @deprecated since 0.1.0 |
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14 | */ |
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15 | public static $defaultSpecialCaseTags = array('strong', 'b', 'i', 'big', 'small', 'u', 'sub', 'sup', 'strike', 's', 'p'); |
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16 | |||
17 | /** |
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18 | * @var array |
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19 | * |
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20 | * @deprecated since 0.1.0 |
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21 | */ |
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22 | public static $defaultSpecialCaseChars = array('.', ',', '(', ')', '\''); |
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23 | |||
24 | /** |
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25 | * @var bool |
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26 | * |
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27 | * @deprecated since 0.1.0 |
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28 | */ |
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29 | public static $defaultGroupDiffs = true; |
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30 | |||
31 | /** |
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32 | * @var HtmlDiffConfig |
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33 | */ |
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34 | protected $config; |
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35 | |||
36 | /** |
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37 | * @var string |
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38 | */ |
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39 | protected $content; |
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40 | |||
41 | /** |
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42 | * @var string |
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43 | */ |
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44 | protected $oldText; |
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45 | |||
46 | /** |
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47 | * @var string |
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48 | */ |
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49 | protected $newText; |
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50 | |||
51 | /** |
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52 | * @var array |
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53 | */ |
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54 | protected $oldWords = array(); |
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55 | |||
56 | /** |
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57 | * @var array |
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58 | */ |
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59 | protected $newWords = array(); |
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60 | |||
61 | /** |
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62 | * @var DiffCache[] |
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63 | */ |
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64 | protected $diffCaches = array(); |
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65 | |||
66 | /** |
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67 | * @var \HTMLPurifier |
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68 | */ |
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69 | protected $purifier; |
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70 | |||
71 | /** |
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72 | * @var \HTMLPurifier_Config|null |
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73 | */ |
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74 | protected $purifierConfig = null; |
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75 | |||
76 | /** |
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77 | * @see array_slice_cached(); |
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78 | * @var bool |
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79 | */ |
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80 | protected $resetCache = false; |
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81 | |||
82 | /** |
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83 | * AbstractDiff constructor. |
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84 | * |
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85 | * @param string $oldText |
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86 | * @param string $newText |
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87 | * @param string $encoding |
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88 | * @param null|array $specialCaseTags |
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89 | * @param null|bool $groupDiffs |
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90 | */ |
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91 | 15 | public function __construct($oldText, $newText, $encoding = 'UTF-8', $specialCaseTags = null, $groupDiffs = null) |
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92 | { |
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93 | 15 | mb_substitute_character(0x20); |
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94 | |||
95 | 15 | $this->setConfig(HtmlDiffConfig::create()->setEncoding($encoding)); |
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96 | |||
97 | 15 | if ($specialCaseTags !== null) { |
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98 | 14 | $this->config->setSpecialCaseTags($specialCaseTags); |
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99 | } |
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100 | |||
101 | 15 | if ($groupDiffs !== null) { |
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102 | $this->config->setGroupDiffs($groupDiffs); |
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103 | } |
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104 | |||
105 | 15 | $this->oldText = $oldText; |
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106 | 15 | $this->newText = $newText; |
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107 | 15 | $this->content = ''; |
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108 | 15 | } |
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109 | |||
110 | /** |
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111 | * @return bool|string |
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112 | */ |
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113 | abstract public function build(); |
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114 | |||
115 | /** |
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116 | * Initializes HTMLPurifier with cache location. |
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117 | * |
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118 | * @param null|string $defaultPurifierSerializerCache |
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119 | */ |
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120 | 15 | public function initPurifier($defaultPurifierSerializerCache = null) |
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121 | { |
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122 | 15 | if (null !== $this->purifierConfig) { |
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123 | 2 | $HTMLPurifierConfig = $this->purifierConfig; |
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124 | } else { |
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125 | 15 | $HTMLPurifierConfig = \HTMLPurifier_Config::createDefault(); |
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126 | } |
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127 | |||
128 | // Cache.SerializerPath defaults to Null and sets |
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129 | // the location to inside the vendor HTMLPurifier library |
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130 | // under the DefinitionCache/Serializer folder. |
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131 | 15 | if (!is_null($defaultPurifierSerializerCache)) { |
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132 | 2 | $HTMLPurifierConfig->set('Cache.SerializerPath', $defaultPurifierSerializerCache); |
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133 | } |
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134 | |||
135 | 15 | $this->purifier = new \HTMLPurifier($HTMLPurifierConfig); |
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136 | 15 | } |
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137 | |||
138 | /** |
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139 | * Prepare (purify) the HTML |
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140 | * |
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141 | * @return void |
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142 | */ |
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143 | 15 | protected function prepare() |
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150 | |||
151 | /** |
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152 | * @return DiffCache|null |
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153 | */ |
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154 | protected function getDiffCache() |
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155 | { |
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156 | if (!$this->hasDiffCache()) { |
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157 | return null; |
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158 | } |
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159 | |||
160 | $hash = spl_object_hash($this->getConfig()->getCacheProvider()); |
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161 | |||
162 | if (!array_key_exists($hash, $this->diffCaches)) { |
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163 | $this->diffCaches[$hash] = new DiffCache($this->getConfig()->getCacheProvider()); |
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164 | } |
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165 | |||
166 | return $this->diffCaches[$hash]; |
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167 | } |
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168 | |||
169 | /** |
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170 | * @return bool |
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171 | */ |
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172 | 15 | protected function hasDiffCache() |
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176 | |||
177 | /** |
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178 | * @return HtmlDiffConfig |
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179 | */ |
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180 | 15 | public function getConfig() |
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184 | |||
185 | /** |
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186 | * @param HtmlDiffConfig $config |
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187 | * |
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188 | * @return AbstractDiff |
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189 | */ |
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190 | 15 | public function setConfig(HtmlDiffConfig $config) |
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196 | |||
197 | /** |
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198 | * @return int |
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199 | * |
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200 | * @deprecated since 0.1.0 |
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201 | */ |
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202 | public function getMatchThreshold() |
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203 | { |
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204 | return $this->config->getMatchThreshold(); |
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205 | } |
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206 | |||
207 | /** |
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208 | * @param int $matchThreshold |
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209 | * |
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210 | * @return AbstractDiff |
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211 | * |
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212 | * @deprecated since 0.1.0 |
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213 | */ |
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214 | public function setMatchThreshold($matchThreshold) |
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215 | { |
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216 | $this->config->setMatchThreshold($matchThreshold); |
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217 | |||
218 | return $this; |
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219 | } |
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220 | |||
221 | /** |
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222 | * @param array $chars |
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223 | * |
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224 | * @deprecated since 0.1.0 |
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225 | */ |
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226 | public function setSpecialCaseChars(array $chars) |
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227 | { |
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228 | $this->config->setSpecialCaseChars($chars); |
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229 | } |
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230 | |||
231 | /** |
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232 | * @return array|null |
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233 | * |
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234 | * @deprecated since 0.1.0 |
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235 | */ |
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236 | public function getSpecialCaseChars() |
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237 | { |
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238 | return $this->config->getSpecialCaseChars(); |
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239 | } |
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240 | |||
241 | /** |
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242 | * @param string $char |
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243 | * |
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244 | * @deprecated since 0.1.0 |
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245 | */ |
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246 | public function addSpecialCaseChar($char) |
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247 | { |
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248 | $this->config->addSpecialCaseChar($char); |
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249 | } |
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250 | |||
251 | /** |
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252 | * @param string $char |
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253 | * |
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254 | * @deprecated since 0.1.0 |
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255 | */ |
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256 | public function removeSpecialCaseChar($char) |
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257 | { |
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258 | $this->config->removeSpecialCaseChar($char); |
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259 | } |
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260 | |||
261 | /** |
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262 | * @param array $tags |
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263 | * |
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264 | * @deprecated since 0.1.0 |
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265 | */ |
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266 | public function setSpecialCaseTags(array $tags = array()) |
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267 | { |
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268 | $this->config->setSpecialCaseChars($tags); |
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269 | } |
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270 | |||
271 | /** |
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272 | * @param string $tag |
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273 | * |
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274 | * @deprecated since 0.1.0 |
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275 | */ |
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276 | public function addSpecialCaseTag($tag) |
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277 | { |
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278 | $this->config->addSpecialCaseTag($tag); |
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279 | } |
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280 | |||
281 | /** |
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282 | * @param string $tag |
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283 | * |
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284 | * @deprecated since 0.1.0 |
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285 | */ |
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286 | public function removeSpecialCaseTag($tag) |
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287 | { |
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288 | $this->config->removeSpecialCaseTag($tag); |
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289 | } |
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290 | |||
291 | /** |
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292 | * @return array|null |
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293 | * |
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294 | * @deprecated since 0.1.0 |
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295 | */ |
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296 | public function getSpecialCaseTags() |
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297 | { |
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298 | return $this->config->getSpecialCaseTags(); |
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299 | } |
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300 | |||
301 | /** |
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302 | * @return string |
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303 | */ |
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304 | public function getOldHtml() |
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308 | |||
309 | /** |
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310 | * @return string |
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311 | */ |
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312 | public function getNewHtml() |
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316 | |||
317 | /** |
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318 | * @return string |
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319 | */ |
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320 | public function getDifference() |
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324 | |||
325 | /** |
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326 | * Clears the diff content. |
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327 | * |
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328 | * @return void |
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329 | */ |
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330 | public function clearContent() |
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334 | |||
335 | /** |
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336 | * @param bool $boolean |
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337 | * |
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338 | * @return $this |
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339 | * |
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340 | * @deprecated since 0.1.0 |
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341 | */ |
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342 | public function setGroupDiffs($boolean) |
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343 | { |
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344 | $this->config->setGroupDiffs($boolean); |
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345 | |||
346 | return $this; |
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347 | } |
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348 | |||
349 | /** |
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350 | * @return bool |
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351 | * |
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352 | * @deprecated since 0.1.0 |
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353 | */ |
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354 | 15 | public function isGroupDiffs() |
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355 | { |
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356 | 15 | return $this->config->isGroupDiffs(); |
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357 | } |
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358 | |||
359 | /** |
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360 | * @param \HTMLPurifier_Config $config |
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361 | */ |
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362 | 2 | public function setHTMLPurifierConfig(\HTMLPurifier_Config $config) |
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366 | |||
367 | /** |
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368 | * @param string $tag |
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369 | * |
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370 | * @return string |
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371 | */ |
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372 | protected function getOpeningTag($tag) |
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376 | |||
377 | /** |
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378 | * @param string $tag |
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379 | * |
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380 | * @return string |
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381 | */ |
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382 | protected function getClosingTag($tag) |
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386 | |||
387 | /** |
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388 | * @param string $str |
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389 | * @param string $start |
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390 | * @param string $end |
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391 | * |
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392 | * @return string |
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393 | */ |
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394 | protected function getStringBetween($str, $start, $end) |
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395 | { |
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396 | $expStr = explode($start, $str, 2); |
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397 | if (count($expStr) > 1) { |
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398 | $expStr = explode($end, $expStr[ 1 ]); |
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399 | if (count($expStr) > 1) { |
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400 | array_pop($expStr); |
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401 | |||
402 | return implode($end, $expStr); |
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403 | } |
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404 | } |
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405 | |||
406 | return ''; |
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407 | } |
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408 | |||
409 | /** |
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410 | * @param string $html |
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411 | * |
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412 | * @return string |
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413 | */ |
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414 | 15 | protected function purifyHtml($html) |
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427 | |||
428 | 15 | protected function splitInputsToWords() |
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433 | |||
434 | /** |
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435 | * @param array $oldWords |
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436 | */ |
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437 | 15 | protected function setOldWords(array $oldWords) |
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442 | |||
443 | /** |
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444 | * @param array $newWords |
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445 | */ |
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446 | 15 | protected function setNewWords(array $newWords) |
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451 | |||
452 | /** |
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453 | * @param string $text |
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454 | * |
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455 | * @return bool |
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456 | */ |
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457 | 15 | protected function isPartOfWord($text) |
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461 | |||
462 | /** |
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463 | * @param array $characterString |
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464 | * |
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465 | * @return array |
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466 | */ |
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467 | 15 | protected function convertHtmlToListOfWords($characterString) |
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468 | { |
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469 | 15 | $mode = 'character'; |
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470 | 15 | $current_word = ''; |
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471 | 15 | $words = array(); |
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472 | 15 | foreach ($characterString as $i => $character) { |
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473 | switch ($mode) { |
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474 | 15 | case 'character': |
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475 | 15 | if ($this->isStartOfTag($character)) { |
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476 | 14 | if ($current_word != '') { |
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477 | 13 | $words[] = $current_word; |
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478 | } |
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479 | |||
480 | 14 | $current_word = '<'; |
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481 | 14 | $mode = 'tag'; |
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482 | 15 | } elseif (preg_match("/\s/", $character)) { |
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483 | 13 | if ($current_word !== '') { |
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484 | 13 | $words[] = $current_word; |
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485 | } |
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486 | 13 | $current_word = preg_replace('/\s+/S', ' ', $character); |
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487 | 13 | $mode = 'whitespace'; |
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488 | } else { |
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489 | if ( |
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490 | 15 | (ctype_alnum($character) && (strlen($current_word) == 0 || $this->isPartOfWord($current_word))) || |
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491 | 15 | (in_array($character, $this->config->getSpecialCaseChars()) && isset($characterString[$i + 1]) && $this->isPartOfWord($characterString[$i + 1])) |
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492 | ) { |
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493 | 15 | $current_word .= $character; |
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494 | } else { |
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495 | 15 | $words[] = $current_word; |
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496 | 15 | $current_word = $character; |
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497 | } |
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498 | } |
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499 | 15 | break; |
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500 | 15 | case 'tag' : |
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501 | 15 | if ($this->isEndOfTag($character)) { |
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502 | 15 | $current_word .= '>'; |
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503 | 15 | $words[] = $current_word; |
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504 | 15 | $current_word = ''; |
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505 | |||
506 | 15 | if (!preg_match('[^\s]', $character)) { |
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507 | 15 | $mode = 'whitespace'; |
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508 | } else { |
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509 | 15 | $mode = 'character'; |
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510 | } |
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511 | } else { |
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512 | 15 | $current_word .= $character; |
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513 | } |
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514 | 15 | break; |
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515 | 15 | case 'whitespace': |
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516 | 15 | if ($this->isStartOfTag($character)) { |
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517 | 13 | if ($current_word !== '') { |
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518 | 13 | $words[] = $current_word; |
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519 | } |
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520 | 13 | $current_word = '<'; |
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521 | 13 | $mode = 'tag'; |
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522 | 15 | } elseif (preg_match("/\s/", $character)) { |
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523 | 11 | $current_word .= $character; |
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524 | 11 | $current_word = preg_replace('/\s+/S', ' ', $current_word); |
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525 | } else { |
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526 | 15 | if ($current_word != '') { |
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527 | 13 | $words[] = $current_word; |
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528 | } |
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529 | 15 | $current_word = $character; |
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530 | 15 | $mode = 'character'; |
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531 | } |
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532 | 15 | break; |
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533 | default: |
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534 | 15 | break; |
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535 | } |
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536 | } |
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537 | 15 | if ($current_word != '') { |
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538 | $words[] = $current_word; |
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539 | } |
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540 | |||
541 | 15 | return $words; |
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542 | } |
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543 | |||
544 | /** |
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545 | * @param string $val |
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546 | * |
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547 | * @return bool |
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548 | */ |
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549 | 15 | protected function isStartOfTag($val) |
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553 | |||
554 | /** |
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555 | * @param string $val |
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556 | * |
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557 | * @return bool |
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558 | */ |
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559 | 15 | protected function isEndOfTag($val) |
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563 | |||
564 | /** |
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565 | * @param string $value |
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566 | * |
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567 | * @return bool |
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568 | */ |
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569 | protected function isWhiteSpace($value) |
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573 | |||
574 | /** |
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575 | * @param string $value |
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576 | * |
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577 | * @return array |
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578 | */ |
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579 | 15 | protected function explode($value) |
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584 | } |
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585 |
Overly long lines are hard to read on any screen. Most code styles therefor impose a maximum limit on the number of characters in a line.