Complex classes like TemplateParser 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 TemplateParser, and based on these observations, apply Extract Interface, too.
1 | <?php |
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25 | class TemplateParser |
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26 | { |
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27 | |||
28 | /** |
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29 | * The following two constants are used for tracking whether we are currently |
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30 | * parsing ViewHelper arguments or not. This is used to parse arrays only as |
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31 | * ViewHelper argument. |
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32 | */ |
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33 | const CONTEXT_INSIDE_VIEWHELPER_ARGUMENTS = 1; |
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34 | const CONTEXT_OUTSIDE_VIEWHELPER_ARGUMENTS = 2; |
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35 | |||
36 | /** |
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37 | * Whether or not the escaping interceptors are active |
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38 | * |
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39 | * @var boolean |
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40 | */ |
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41 | protected $escapingEnabled = true; |
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42 | |||
43 | /** |
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44 | * @var Configuration |
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45 | */ |
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46 | protected $configuration; |
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47 | |||
48 | /** |
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49 | * @var array |
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50 | */ |
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51 | protected $settings; |
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52 | |||
53 | /** |
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54 | * @var RenderingContextInterface |
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55 | */ |
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56 | protected $renderingContext; |
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57 | |||
58 | /** |
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59 | * @var integer |
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60 | */ |
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61 | protected $pointerLineNumber = 1; |
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62 | |||
63 | /** |
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64 | * @var integer |
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65 | */ |
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66 | protected $pointerLineCharacter = 1; |
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67 | |||
68 | /** |
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69 | * @var string |
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70 | */ |
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71 | protected $pointerTemplateCode = null; |
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72 | |||
73 | /** |
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74 | * @var ParsedTemplateInterface[] |
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75 | */ |
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76 | protected $parsedTemplates = []; |
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77 | |||
78 | /** |
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79 | * @param RenderingContextInterface $renderingContext |
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80 | * @return void |
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81 | */ |
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82 | public function setRenderingContext(RenderingContextInterface $renderingContext) |
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83 | { |
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84 | $this->renderingContext = $renderingContext; |
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85 | $this->configuration = $renderingContext->buildParserConfiguration(); |
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86 | } |
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87 | |||
88 | /** |
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89 | * Returns an array of current line number, character in line and reference template code; |
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90 | * for extraction when catching parser-related Exceptions during parsing. |
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91 | * |
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92 | * @return array |
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93 | */ |
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94 | public function getCurrentParsingPointers() |
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95 | { |
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96 | return [$this->pointerLineNumber, $this->pointerLineCharacter, $this->pointerTemplateCode]; |
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97 | } |
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98 | |||
99 | /** |
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100 | * @return boolean |
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101 | */ |
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102 | public function isEscapingEnabled() |
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103 | { |
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104 | return $this->escapingEnabled; |
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105 | } |
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106 | |||
107 | /** |
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108 | * @param boolean $escapingEnabled |
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109 | * @return void |
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110 | */ |
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111 | public function setEscapingEnabled($escapingEnabled) |
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112 | { |
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113 | $this->escapingEnabled = (boolean) $escapingEnabled; |
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114 | } |
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115 | |||
116 | /** |
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117 | * Parses a given template string and returns a parsed template object. |
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118 | * |
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119 | * The resulting ParsedTemplate can then be rendered by calling evaluate() on it. |
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120 | * |
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121 | * Normally, you should use a subclass of AbstractTemplateView instead of calling the |
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122 | * TemplateParser directly. |
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123 | * |
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124 | * @param string $templateString The template to parse as a string |
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125 | * @param string|null $templateIdentifier If the template has an identifying string it can be passed here to improve error reporting. |
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126 | * @return ParsingState Parsed template |
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127 | * @throws Exception |
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128 | */ |
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129 | public function parse($templateString, $templateIdentifier = null) |
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130 | { |
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131 | if (!is_string($templateString)) { |
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132 | throw new Exception('Parse requires a template string as argument, ' . gettype($templateString) . ' given.', 1224237899); |
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133 | } |
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134 | try { |
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135 | $this->reset(); |
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136 | |||
137 | $templateString = $this->preProcessTemplateSource($templateString); |
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138 | |||
139 | $splitTemplate = $this->splitTemplateAtDynamicTags($templateString); |
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140 | $parsingState = $this->buildObjectTree($splitTemplate, self::CONTEXT_OUTSIDE_VIEWHELPER_ARGUMENTS); |
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141 | } catch (Exception $error) { |
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142 | throw $this->createParsingRelatedExceptionWithContext($error, $templateIdentifier); |
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143 | } |
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144 | $this->parsedTemplates[$templateIdentifier] = $parsingState; |
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145 | return $parsingState; |
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146 | } |
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147 | |||
148 | /** |
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149 | * @param \Exception $error |
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150 | * @param string $templateIdentifier |
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151 | * @throws \Exception |
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152 | */ |
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153 | public function createParsingRelatedExceptionWithContext(\Exception $error, $templateIdentifier) |
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171 | |||
172 | /** |
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173 | * @param string $templateIdentifier |
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174 | * @param \Closure $templateSourceClosure Closure which returns the template source if needed |
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175 | * @return ParsedTemplateInterface |
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176 | */ |
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177 | public function getOrParseAndStoreTemplate($templateIdentifier, $templateSourceClosure) |
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178 | { |
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179 | $compiler = $this->renderingContext->getTemplateCompiler(); |
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180 | if (isset($this->parsedTemplates[$templateIdentifier])) { |
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181 | $parsedTemplate = $this->parsedTemplates[$templateIdentifier]; |
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182 | } elseif ($compiler->has($templateIdentifier)) { |
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183 | $parsedTemplate = $compiler->get($templateIdentifier); |
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184 | if ($parsedTemplate instanceof UncompilableTemplateInterface) { |
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185 | $parsedTemplate = $this->parseTemplateSource($templateIdentifier, $templateSourceClosure); |
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186 | } |
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187 | } else { |
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188 | $parsedTemplate = $this->parseTemplateSource($templateIdentifier, $templateSourceClosure); |
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189 | try { |
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190 | $compiler->store($templateIdentifier, $parsedTemplate); |
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191 | } catch (StopCompilingException $stop) { |
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192 | $this->renderingContext->getErrorHandler()->handleCompilerError($stop); |
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193 | $parsedTemplate->setCompilable(false); |
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194 | $compiler->store($templateIdentifier, $parsedTemplate); |
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195 | } |
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196 | } |
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197 | return $parsedTemplate; |
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198 | } |
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199 | |||
200 | /** |
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201 | * @param string $templateIdentifier |
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202 | * @param \Closure $templateSourceClosure |
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203 | * @return ParsedTemplateInterface |
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204 | */ |
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205 | protected function parseTemplateSource($templateIdentifier, $templateSourceClosure) |
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206 | { |
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207 | $parsedTemplate = $this->parse( |
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208 | $templateSourceClosure($this, $this->renderingContext->getTemplatePaths()), |
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209 | $templateIdentifier |
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210 | ); |
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211 | $parsedTemplate->setIdentifier($templateIdentifier); |
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212 | $this->parsedTemplates[$templateIdentifier] = $parsedTemplate; |
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213 | return $parsedTemplate; |
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214 | } |
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215 | |||
216 | /** |
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217 | * Pre-process the template source, making all registered TemplateProcessors |
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218 | * do what they need to do with the template source before it is parsed. |
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219 | * |
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220 | * @param string $templateSource |
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221 | * @return string |
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222 | */ |
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223 | protected function preProcessTemplateSource($templateSource) |
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224 | { |
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225 | foreach ($this->renderingContext->getTemplateProcessors() as $templateProcessor) { |
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226 | $templateSource = $templateProcessor->preProcessSource($templateSource); |
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227 | } |
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228 | return $templateSource; |
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229 | } |
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230 | |||
231 | /** |
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232 | * Resets the parser to its default values. |
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233 | * |
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234 | * @return void |
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235 | */ |
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236 | protected function reset() |
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237 | { |
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238 | $this->escapingEnabled = true; |
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239 | $this->pointerLineNumber = 1; |
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240 | $this->pointerLineCharacter = 1; |
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241 | } |
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242 | |||
243 | /** |
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244 | * Splits the template string on all dynamic tags found. |
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245 | * |
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246 | * @param string $templateString Template string to split. |
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247 | * @return array Splitted template |
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248 | */ |
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249 | protected function splitTemplateAtDynamicTags($templateString) |
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250 | { |
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251 | return preg_split(Patterns::$SPLIT_PATTERN_TEMPLATE_DYNAMICTAGS, $templateString, -1, PREG_SPLIT_DELIM_CAPTURE | PREG_SPLIT_NO_EMPTY); |
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252 | } |
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253 | |||
254 | /** |
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255 | * Build object tree from the split template |
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256 | * |
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257 | * @param array $splitTemplate The split template, so that every tag with a namespace declaration is already a seperate array element. |
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258 | * @param integer $context one of the CONTEXT_* constants, defining whether we are inside or outside of ViewHelper arguments currently. |
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259 | * @return ParsingState |
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260 | * @throws Exception |
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261 | */ |
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262 | protected function buildObjectTree(array $splitTemplate, $context) |
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263 | { |
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264 | $state = $this->getParsingState(); |
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265 | $previousBlock = ''; |
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266 | |||
267 | foreach ($splitTemplate as $templateElement) { |
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268 | if ($context === self::CONTEXT_OUTSIDE_VIEWHELPER_ARGUMENTS) { |
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269 | // Store a neat reference to the outermost chunk of Fluid template code. |
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270 | // Don't store the reference if parsing ViewHelper arguments object tree; |
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271 | // we want the reference code to contain *all* of the ViewHelper call. |
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272 | $this->pointerTemplateCode = $templateElement; |
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273 | } |
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274 | $this->pointerLineNumber += substr_count($templateElement, PHP_EOL); |
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275 | $this->pointerLineCharacter = strlen(substr($previousBlock, strrpos($previousBlock, PHP_EOL))) + 1; |
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276 | $previousBlock = $templateElement; |
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277 | $matchedVariables = []; |
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278 | |||
279 | if (preg_match(Patterns::$SCAN_PATTERN_TEMPLATE_VIEWHELPERTAG, $templateElement, $matchedVariables) > 0) { |
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280 | if ($this->openingViewHelperTagHandler( |
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281 | $state, |
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282 | $matchedVariables['NamespaceIdentifier'], |
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283 | $matchedVariables['MethodIdentifier'], |
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284 | $matchedVariables['Attributes'], |
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285 | ($matchedVariables['Selfclosing'] === '' ? false : true), |
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286 | $templateElement |
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287 | )) { |
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288 | continue; |
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289 | } |
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290 | } elseif (preg_match(Patterns::$SCAN_PATTERN_TEMPLATE_CLOSINGVIEWHELPERTAG, $templateElement, $matchedVariables) > 0) { |
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291 | if ($this->closingViewHelperTagHandler( |
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292 | $state, |
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293 | $matchedVariables['NamespaceIdentifier'], |
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294 | $matchedVariables['MethodIdentifier'] |
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295 | )) { |
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296 | continue; |
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297 | } |
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298 | } |
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299 | $this->textAndShorthandSyntaxHandler($state, $templateElement, $context); |
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300 | } |
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301 | |||
302 | if ($state->countNodeStack() !== 1) { |
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303 | throw new Exception( |
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304 | 'Not all tags were closed!', |
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305 | 1238169398 |
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306 | ); |
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307 | } |
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308 | return $state; |
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309 | } |
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310 | /** |
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311 | * Handles an opening or self-closing view helper tag. |
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312 | * |
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313 | * @param ParsingState $state Current parsing state |
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314 | * @param string $namespaceIdentifier Namespace identifier - being looked up in $this->namespaces |
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315 | * @param string $methodIdentifier Method identifier |
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316 | * @param string $arguments Arguments string, not yet parsed |
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317 | * @param boolean $selfclosing true, if the tag is a self-closing tag. |
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318 | * @param string $templateElement The template code containing the ViewHelper call |
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319 | * @return NodeInterface|null |
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320 | */ |
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321 | protected function openingViewHelperTagHandler(ParsingState $state, $namespaceIdentifier, $methodIdentifier, $arguments, $selfclosing, $templateElement) |
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322 | { |
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323 | $viewHelperNode = $this->initializeViewHelperAndAddItToStack( |
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324 | $state, |
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325 | $namespaceIdentifier, |
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326 | $methodIdentifier, |
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327 | $this->parseArguments($arguments) |
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328 | ); |
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329 | |||
330 | if ($viewHelperNode) { |
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331 | $viewHelperNode->setPointerTemplateCode($templateElement); |
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332 | if ($selfclosing === true) { |
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333 | $state->popNodeFromStack(); |
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334 | $this->callInterceptor($viewHelperNode, InterceptorInterface::INTERCEPT_CLOSING_VIEWHELPER, $state); |
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335 | // This needs to be called here because closingViewHelperTagHandler() is not triggered for self-closing tags |
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336 | $state->getNodeFromStack()->addChildNode($viewHelperNode); |
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337 | } |
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338 | } |
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339 | |||
340 | return $viewHelperNode; |
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341 | } |
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342 | |||
343 | /** |
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344 | * Initialize the given ViewHelper and adds it to the current node and to |
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345 | * the stack. |
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346 | * |
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347 | * @param ParsingState $state Current parsing state |
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348 | * @param string $namespaceIdentifier Namespace identifier - being looked up in $this->namespaces |
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349 | * @param string $methodIdentifier Method identifier |
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350 | * @param array $argumentsObjectTree Arguments object tree |
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351 | * @return null|NodeInterface An instance of ViewHelperNode if identity was valid - NULL if the namespace/identity was not registered |
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352 | * @throws Exception |
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353 | */ |
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354 | protected function initializeViewHelperAndAddItToStack(ParsingState $state, $namespaceIdentifier, $methodIdentifier, $argumentsObjectTree) |
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355 | { |
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356 | $viewHelperResolver = $this->renderingContext->getViewHelperResolver(); |
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357 | if (!$viewHelperResolver->isNamespaceValid($namespaceIdentifier)) { |
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358 | return null; |
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359 | } |
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360 | try { |
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361 | $currentViewHelperNode = new ViewHelperNode( |
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362 | $this->renderingContext, |
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363 | $namespaceIdentifier, |
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364 | $methodIdentifier, |
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365 | $argumentsObjectTree, |
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366 | $state |
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367 | ); |
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368 | |||
369 | $this->callInterceptor($currentViewHelperNode, InterceptorInterface::INTERCEPT_OPENING_VIEWHELPER, $state); |
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370 | $viewHelper = $currentViewHelperNode->getUninitializedViewHelper(); |
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371 | $viewHelper::postParseEvent($currentViewHelperNode, $argumentsObjectTree, $state->getVariableContainer()); |
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372 | $state->pushNodeToStack($currentViewHelperNode); |
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373 | return $currentViewHelperNode; |
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374 | } catch (\TYPO3Fluid\Fluid\Core\ViewHelper\Exception $error) { |
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375 | $this->textHandler( |
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376 | $state, |
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377 | $this->renderingContext->getErrorHandler()->handleViewHelperError($error) |
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378 | ); |
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379 | } catch (Exception $error) { |
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380 | $this->textHandler( |
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381 | $state, |
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382 | $this->renderingContext->getErrorHandler()->handleParserError($error) |
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383 | ); |
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384 | } |
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385 | return null; |
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386 | } |
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387 | |||
388 | /** |
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389 | * Handles a closing view helper tag |
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390 | * |
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391 | * @param ParsingState $state The current parsing state |
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392 | * @param string $namespaceIdentifier Namespace identifier for the closing tag. |
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393 | * @param string $methodIdentifier Method identifier. |
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394 | * @return boolean whether the viewHelper was found and added to the stack or not |
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395 | * @throws Exception |
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396 | */ |
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397 | protected function closingViewHelperTagHandler(ParsingState $state, $namespaceIdentifier, $methodIdentifier) |
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398 | { |
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399 | $viewHelperResolver = $this->renderingContext->getViewHelperResolver(); |
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400 | if (!$viewHelperResolver->isNamespaceValid($namespaceIdentifier)) { |
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401 | return false; |
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402 | } |
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403 | $lastStackElement = $state->popNodeFromStack(); |
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404 | if (!($lastStackElement instanceof ViewHelperNode)) { |
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405 | throw new Exception('You closed a templating tag which you never opened!', 1224485838); |
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406 | } |
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407 | $actualViewHelperClassName = $viewHelperResolver->resolveViewHelperClassName($namespaceIdentifier, $methodIdentifier); |
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408 | $expectedViewHelperClassName = $lastStackElement->getViewHelperClassName(); |
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409 | if ($actualViewHelperClassName !== $expectedViewHelperClassName) { |
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410 | throw new Exception( |
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411 | 'Templating tags not properly nested. Expected: ' . $expectedViewHelperClassName . '; Actual: ' . |
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412 | $actualViewHelperClassName, |
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413 | 1224485398 |
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414 | ); |
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415 | } |
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416 | $this->callInterceptor($lastStackElement, InterceptorInterface::INTERCEPT_CLOSING_VIEWHELPER, $state); |
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417 | $state->getNodeFromStack()->addChildNode($lastStackElement); |
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418 | |||
419 | return true; |
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420 | } |
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421 | |||
422 | /** |
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423 | * Handles the appearance of an object accessor (like {posts.author.email}). |
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424 | * Creates a new instance of \TYPO3Fluid\Fluid\ObjectAccessorNode. |
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425 | * |
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426 | * Handles ViewHelpers as well which are in the shorthand syntax. |
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427 | * |
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428 | * @param ParsingState $state The current parsing state |
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429 | * @param string $objectAccessorString String which identifies which objects to fetch |
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430 | * @param string $delimiter |
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431 | * @param string $viewHelperString |
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432 | * @param string $additionalViewHelpersString |
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433 | * @return void |
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434 | */ |
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435 | protected function objectAccessorHandler(ParsingState $state, $objectAccessorString, $delimiter, $viewHelperString, $additionalViewHelpersString) |
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436 | { |
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437 | $viewHelperString .= $additionalViewHelpersString; |
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438 | $numberOfViewHelpers = 0; |
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439 | |||
440 | // The following post-processing handles a case when there is only a ViewHelper, and no Object Accessor. |
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441 | // Resolves bug #5107. |
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442 | if (strlen($delimiter) === 0 && strlen($viewHelperString) > 0) { |
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443 | $viewHelperString = $objectAccessorString . $viewHelperString; |
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444 | $objectAccessorString = ''; |
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445 | } |
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446 | |||
447 | // ViewHelpers |
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448 | $matches = []; |
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449 | if (strlen($viewHelperString) > 0 && preg_match_all(Patterns::$SPLIT_PATTERN_SHORTHANDSYNTAX_VIEWHELPER, $viewHelperString, $matches, PREG_SET_ORDER) > 0) { |
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450 | // The last ViewHelper has to be added first for correct chaining. |
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451 | foreach (array_reverse($matches) as $singleMatch) { |
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452 | if (strlen($singleMatch['ViewHelperArguments']) > 0) { |
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453 | $arguments = $this->recursiveArrayHandler($singleMatch['ViewHelperArguments']); |
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454 | } else { |
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455 | $arguments = []; |
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456 | } |
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457 | $viewHelperNode = $this->initializeViewHelperAndAddItToStack($state, $singleMatch['NamespaceIdentifier'], $singleMatch['MethodIdentifier'], $arguments); |
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458 | if ($viewHelperNode) { |
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459 | $numberOfViewHelpers++; |
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460 | } |
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461 | } |
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462 | } |
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463 | |||
464 | // Object Accessor |
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465 | if (strlen($objectAccessorString) > 0) { |
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466 | $node = new ObjectAccessorNode($objectAccessorString); |
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467 | $this->callInterceptor($node, InterceptorInterface::INTERCEPT_OBJECTACCESSOR, $state); |
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468 | $state->getNodeFromStack()->addChildNode($node); |
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469 | } |
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470 | |||
471 | // Close ViewHelper Tags if needed. |
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472 | for ($i = 0; $i < $numberOfViewHelpers; $i++) { |
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473 | $node = $state->popNodeFromStack(); |
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474 | $this->callInterceptor($node, InterceptorInterface::INTERCEPT_CLOSING_VIEWHELPER, $state); |
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475 | $state->getNodeFromStack()->addChildNode($node); |
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476 | } |
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477 | } |
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478 | |||
479 | /** |
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480 | * Call all interceptors registered for a given interception point. |
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481 | * |
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482 | * @param NodeInterface $node The syntax tree node which can be modified by the interceptors. |
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483 | * @param integer $interceptionPoint the interception point. One of the \TYPO3Fluid\Fluid\Core\Parser\InterceptorInterface::INTERCEPT_* constants. |
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484 | * @param ParsingState $state the parsing state |
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485 | * @return void |
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486 | */ |
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487 | protected function callInterceptor(NodeInterface & $node, $interceptionPoint, ParsingState $state) |
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488 | { |
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489 | if ($this->configuration === null) { |
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490 | return; |
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491 | } |
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492 | if ($this->escapingEnabled) { |
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493 | /** @var $interceptor InterceptorInterface */ |
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494 | foreach ($this->configuration->getEscapingInterceptors($interceptionPoint) as $interceptor) { |
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495 | $node = $interceptor->process($node, $interceptionPoint, $state); |
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496 | } |
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497 | } |
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498 | |||
499 | /** @var $interceptor InterceptorInterface */ |
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500 | foreach ($this->configuration->getInterceptors($interceptionPoint) as $interceptor) { |
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501 | $node = $interceptor->process($node, $interceptionPoint, $state); |
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502 | } |
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503 | } |
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504 | |||
505 | /** |
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506 | * Parse arguments of a given tag, and build up the Arguments Object Tree |
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507 | * for each argument. |
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508 | * Returns an associative array, where the key is the name of the argument, |
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509 | * and the value is a single Argument Object Tree. |
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510 | * |
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511 | * @param string $argumentsString All arguments as string |
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512 | * @return array An associative array of objects, where the key is the argument name. |
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513 | */ |
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514 | protected function parseArguments($argumentsString) |
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530 | |||
531 | /** |
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532 | * Build up an argument object tree for the string in $argumentString. |
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533 | * This builds up the tree for a single argument value. |
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534 | * |
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535 | * This method also does some performance optimizations, so in case |
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536 | * no { or < is found, then we just return a TextNode. |
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537 | * |
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538 | * @param string $argumentString |
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539 | * @return SyntaxTree\NodeInterface the corresponding argument object tree. |
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540 | */ |
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541 | protected function buildArgumentObjectTree($argumentString) |
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542 | { |
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543 | if (strpos($argumentString, '{') === false && strpos($argumentString, '<') === false) { |
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544 | if (is_numeric($argumentString)) { |
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545 | return new NumericNode($argumentString); |
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546 | } |
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553 | |||
554 | /** |
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555 | * Removes escapings from a given argument string and trims the outermost |
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556 | * quotes. |
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557 | * |
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558 | * This method is meant as a helper for regular expression results. |
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559 | * |
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560 | * @param string $quotedValue Value to unquote |
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561 | * @return string Unquoted value |
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562 | */ |
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563 | public function unquoteString($quotedValue) |
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573 | |||
574 | /** |
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575 | * Handler for everything which is not a ViewHelperNode. |
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576 | * |
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577 | * This includes Text, array syntax, and object accessor syntax. |
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578 | * |
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579 | * @param ParsingState $state Current parsing state |
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580 | * @param string $text Text to process |
||
581 | * @param integer $context one of the CONTEXT_* constants, defining whether we are inside or outside of ViewHelper arguments currently. |
||
582 | * @return void |
||
583 | */ |
||
584 | protected function textAndShorthandSyntaxHandler(ParsingState $state, $text, $context) |
||
646 | |||
647 | /** |
||
648 | * Handler for array syntax. This creates the array object recursively and |
||
649 | * adds it to the current node. |
||
650 | * |
||
651 | * @param ParsingState $state The current parsing state |
||
652 | * @param NodeInterface[] $arrayText The array as string. |
||
653 | * @return void |
||
654 | */ |
||
655 | protected function arrayHandler(ParsingState $state, $arrayText) |
||
660 | |||
661 | /** |
||
662 | * Recursive function which takes the string representation of an array and |
||
663 | * builds an object tree from it. |
||
664 | * |
||
665 | * Deals with the following value types: |
||
666 | * - Numbers (Integers and Floats) |
||
667 | * - Strings |
||
668 | * - Variables |
||
669 | * - sub-arrays |
||
670 | * |
||
671 | * @param string $arrayText Array text |
||
672 | * @return NodeInterface[] the array node built up |
||
673 | * @throws Exception |
||
674 | */ |
||
675 | protected function recursiveArrayHandler($arrayText) |
||
696 | |||
697 | /** |
||
698 | * Text node handler |
||
699 | * |
||
700 | * @param ParsingState $state |
||
701 | * @param string $text |
||
702 | * @return void |
||
703 | */ |
||
704 | protected function textHandler(ParsingState $state, $text) |
||
710 | |||
711 | /** |
||
712 | * @return ParsingState |
||
713 | */ |
||
714 | protected function getParsingState() |
||
724 | } |
||
725 |
This check looks for parameters that are defined as one type in their type hint or doc comment but seem to be used as a narrower type, i.e an implementation of an interface or a subclass.
Consider changing the type of the parameter or doing an instanceof check before assuming your parameter is of the expected type.