Duplicate code is one of the most pungent code smells. A rule that is often used is to re-structure code once it is duplicated in three or more places.
Common duplication problems, and corresponding solutions are:
Complex classes like DocParser 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 DocParser, and based on these observations, apply Extract Interface, too.
1 | <?php |
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40 | final class DocParser |
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41 | { |
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42 | /** |
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43 | * An array of all valid tokens for a class name. |
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44 | * |
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45 | * @var array |
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46 | */ |
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47 | private static $classIdentifiers = array( |
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48 | DocLexer::T_IDENTIFIER, |
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49 | DocLexer::T_TRUE, |
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50 | DocLexer::T_FALSE, |
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51 | DocLexer::T_NULL |
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52 | ); |
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53 | |||
54 | /** |
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55 | * The lexer. |
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56 | * |
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57 | * @var \Doctrine\Common\Annotations\DocLexer |
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58 | */ |
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59 | private $lexer; |
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60 | |||
61 | /** |
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62 | * Current target context. |
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63 | * |
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64 | * @var string |
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65 | */ |
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66 | private $target; |
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67 | |||
68 | /** |
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69 | * Doc parser used to collect annotation target. |
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70 | * |
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71 | * @var \Doctrine\Common\Annotations\DocParser |
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72 | */ |
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73 | private static $metadataParser; |
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74 | |||
75 | /** |
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76 | * Flag to control if the current annotation is nested or not. |
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77 | * |
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78 | * @var boolean |
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79 | */ |
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80 | private $isNestedAnnotation = false; |
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81 | |||
82 | /** |
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83 | * Hashmap containing all use-statements that are to be used when parsing |
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84 | * the given doc block. |
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85 | * |
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86 | * @var array |
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87 | */ |
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88 | private $imports = array(); |
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89 | |||
90 | /** |
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91 | * This hashmap is used internally to cache results of class_exists() |
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92 | * look-ups. |
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93 | * |
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94 | * @var array |
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95 | */ |
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96 | private $classExists = array(); |
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97 | |||
98 | /** |
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99 | * Whether annotations that have not been imported should be ignored. |
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100 | * |
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101 | * @var boolean |
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102 | */ |
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103 | private $ignoreNotImportedAnnotations = false; |
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104 | |||
105 | /** |
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106 | * An array of default namespaces if operating in simple mode. |
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107 | * |
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108 | * @var array |
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109 | */ |
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110 | private $namespaces = array(); |
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111 | |||
112 | /** |
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113 | * A list with annotations that are not causing exceptions when not resolved to an annotation class. |
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114 | * |
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115 | * The names must be the raw names as used in the class, not the fully qualified |
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116 | * class names. |
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117 | * |
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118 | * @var array |
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119 | */ |
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120 | private $ignoredAnnotationNames = array(); |
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121 | |||
122 | /** |
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123 | * @var string |
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124 | */ |
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125 | private $context = ''; |
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126 | |||
127 | /** |
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128 | * Hash-map for caching annotation metadata. |
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129 | * |
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130 | * @var array |
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131 | */ |
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132 | private static $annotationMetadata = array( |
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133 | 'Doctrine\Common\Annotations\Annotation\Target' => array( |
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134 | 'is_annotation' => true, |
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135 | 'has_constructor' => true, |
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136 | 'properties' => array(), |
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137 | 'targets_literal' => 'ANNOTATION_CLASS', |
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138 | 'targets' => Target::TARGET_CLASS, |
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139 | 'default_property' => 'value', |
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140 | 'attribute_types' => array( |
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141 | 'value' => array( |
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142 | 'required' => false, |
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143 | 'type' =>'array', |
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144 | 'array_type'=>'string', |
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145 | 'value' =>'array<string>' |
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146 | ) |
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147 | ), |
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148 | ), |
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149 | 'Doctrine\Common\Annotations\Annotation\Attribute' => array( |
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150 | 'is_annotation' => true, |
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151 | 'has_constructor' => false, |
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152 | 'targets_literal' => 'ANNOTATION_ANNOTATION', |
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153 | 'targets' => Target::TARGET_ANNOTATION, |
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154 | 'default_property' => 'name', |
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155 | 'properties' => array( |
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156 | 'name' => 'name', |
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157 | 'type' => 'type', |
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158 | 'required' => 'required' |
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159 | ), |
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160 | 'attribute_types' => array( |
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161 | 'value' => array( |
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162 | 'required' => true, |
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163 | 'type' =>'string', |
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164 | 'value' =>'string' |
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165 | ), |
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166 | 'type' => array( |
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167 | 'required' =>true, |
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168 | 'type' =>'string', |
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169 | 'value' =>'string' |
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170 | ), |
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171 | 'required' => array( |
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172 | 'required' =>false, |
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173 | 'type' =>'boolean', |
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174 | 'value' =>'boolean' |
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175 | ) |
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176 | ), |
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177 | ), |
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178 | 'Doctrine\Common\Annotations\Annotation\Attributes' => array( |
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179 | 'is_annotation' => true, |
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180 | 'has_constructor' => false, |
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181 | 'targets_literal' => 'ANNOTATION_CLASS', |
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182 | 'targets' => Target::TARGET_CLASS, |
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183 | 'default_property' => 'value', |
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184 | 'properties' => array( |
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185 | 'value' => 'value' |
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186 | ), |
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187 | 'attribute_types' => array( |
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188 | 'value' => array( |
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189 | 'type' =>'array', |
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190 | 'required' =>true, |
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191 | 'array_type'=>'Doctrine\Common\Annotations\Annotation\Attribute', |
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192 | 'value' =>'array<Doctrine\Common\Annotations\Annotation\Attribute>' |
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193 | ) |
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194 | ), |
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195 | ), |
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196 | 'Doctrine\Common\Annotations\Annotation\Enum' => array( |
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197 | 'is_annotation' => true, |
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198 | 'has_constructor' => true, |
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199 | 'targets_literal' => 'ANNOTATION_PROPERTY', |
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200 | 'targets' => Target::TARGET_PROPERTY, |
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201 | 'default_property' => 'value', |
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202 | 'properties' => array( |
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203 | 'value' => 'value' |
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204 | ), |
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205 | 'attribute_types' => array( |
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206 | 'value' => array( |
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207 | 'type' => 'array', |
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208 | 'required' => true, |
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209 | ), |
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210 | 'literal' => array( |
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211 | 'type' => 'array', |
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212 | 'required' => false, |
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213 | ), |
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214 | ), |
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215 | ), |
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216 | ); |
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217 | |||
218 | /** |
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219 | * Hash-map for handle types declaration. |
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220 | * |
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221 | * @var array |
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222 | */ |
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223 | private static $typeMap = array( |
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224 | 'float' => 'double', |
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225 | 'bool' => 'boolean', |
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226 | // allow uppercase Boolean in honor of George Boole |
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227 | 'Boolean' => 'boolean', |
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228 | 'int' => 'integer', |
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229 | ); |
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230 | |||
231 | /** |
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232 | * Constructs a new DocParser. |
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233 | */ |
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234 | public function __construct() |
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238 | |||
239 | /** |
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240 | * Sets the annotation names that are ignored during the parsing process. |
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241 | * |
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242 | * The names are supposed to be the raw names as used in the class, not the |
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243 | * fully qualified class names. |
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244 | * |
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245 | * @param array $names |
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246 | * |
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247 | * @return void |
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248 | */ |
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249 | public function setIgnoredAnnotationNames(array $names) |
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253 | |||
254 | /** |
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255 | * Sets ignore on not-imported annotations. |
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256 | * |
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257 | * @param boolean $bool |
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258 | * |
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259 | * @return void |
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260 | */ |
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261 | public function setIgnoreNotImportedAnnotations($bool) |
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265 | |||
266 | /** |
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267 | * Sets the default namespaces. |
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268 | * |
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269 | * @param array $namespace |
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270 | * |
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271 | * @return void |
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272 | * |
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273 | * @throws \RuntimeException |
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274 | */ |
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275 | public function addNamespace($namespace) |
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276 | { |
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277 | if ($this->imports) { |
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278 | throw new \RuntimeException('You must either use addNamespace(), or setImports(), but not both.'); |
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279 | } |
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280 | |||
281 | $this->namespaces[] = $namespace; |
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282 | } |
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283 | |||
284 | /** |
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285 | * Sets the imports. |
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286 | * |
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287 | * @param array $imports |
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288 | * |
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289 | * @return void |
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290 | * |
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291 | * @throws \RuntimeException |
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292 | */ |
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293 | public function setImports(array $imports) |
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294 | { |
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295 | if ($this->namespaces) { |
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296 | throw new \RuntimeException('You must either use addNamespace(), or setImports(), but not both.'); |
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297 | } |
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298 | |||
299 | $this->imports = $imports; |
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300 | } |
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301 | |||
302 | /** |
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303 | * Sets current target context as bitmask. |
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304 | * |
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305 | * @param integer $target |
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306 | * |
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307 | * @return void |
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308 | */ |
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309 | public function setTarget($target) |
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313 | |||
314 | /** |
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315 | * Parses the given docblock string for annotations. |
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316 | * |
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317 | * @param string $input The docblock string to parse. |
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318 | * @param string $context The parsing context. |
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319 | * |
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320 | * @return array Array of annotations. If no annotations are found, an empty array is returned. |
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321 | */ |
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322 | public function parse($input, $context = '') |
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323 | { |
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324 | $pos = $this->findInitialTokenPosition($input); |
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325 | if ($pos === null) { |
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326 | return array(); |
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327 | } |
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328 | |||
329 | $this->context = $context; |
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330 | |||
331 | $this->lexer->setInput(trim(substr($input, $pos), '* /')); |
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332 | $this->lexer->moveNext(); |
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333 | |||
334 | return $this->Annotations(); |
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335 | } |
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336 | |||
337 | /** |
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338 | * Finds the first valid annotation |
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339 | * |
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340 | * @param string $input The docblock string to parse |
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341 | * |
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342 | * @return int|null |
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343 | */ |
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344 | private function findInitialTokenPosition($input) |
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345 | { |
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346 | $pos = 0; |
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347 | |||
348 | // search for first valid annotation |
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349 | while (($pos = strpos($input, '@', $pos)) !== false) { |
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350 | // if the @ is preceded by a space or * it is valid |
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351 | if ($pos === 0 || $input[$pos - 1] === ' ' || $input[$pos - 1] === '*') { |
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352 | return $pos; |
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353 | } |
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354 | |||
355 | $pos++; |
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356 | } |
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357 | |||
358 | return null; |
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359 | } |
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360 | |||
361 | /** |
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362 | * Attempts to match the given token with the current lookahead token. |
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363 | * If they match, updates the lookahead token; otherwise raises a syntax error. |
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364 | * |
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365 | * @param integer $token Type of token. |
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366 | * |
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367 | * @return boolean True if tokens match; false otherwise. |
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368 | */ |
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369 | private function match($token) |
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370 | { |
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371 | if ( ! $this->lexer->isNextToken($token) ) { |
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372 | $this->syntaxError($this->lexer->getLiteral($token)); |
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373 | } |
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374 | |||
375 | return $this->lexer->moveNext(); |
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376 | } |
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377 | |||
378 | /** |
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379 | * Attempts to match the current lookahead token with any of the given tokens. |
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380 | * |
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381 | * If any of them matches, this method updates the lookahead token; otherwise |
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382 | * a syntax error is raised. |
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383 | * |
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384 | * @param array $tokens |
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385 | * |
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386 | * @return boolean |
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387 | */ |
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388 | private function matchAny(array $tokens) |
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389 | { |
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390 | if ( ! $this->lexer->isNextTokenAny($tokens)) { |
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391 | $this->syntaxError(implode(' or ', array_map(array($this->lexer, 'getLiteral'), $tokens))); |
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392 | } |
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393 | |||
394 | return $this->lexer->moveNext(); |
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395 | } |
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396 | |||
397 | /** |
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398 | * Generates a new syntax error. |
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399 | * |
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400 | * @param string $expected Expected string. |
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401 | * @param array|null $token Optional token. |
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402 | * |
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403 | * @return void |
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404 | * |
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405 | * @throws AnnotationException |
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406 | */ |
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407 | private function syntaxError($expected, $token = null) |
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426 | |||
427 | /** |
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428 | * Attempts to check if a class exists or not. This never goes through the PHP autoloading mechanism |
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429 | * but uses the {@link AnnotationRegistry} to load classes. |
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430 | * |
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431 | * @param string $fqcn |
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432 | * |
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433 | * @return boolean |
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434 | */ |
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435 | private function classExists($fqcn) |
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436 | { |
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437 | if (isset($this->classExists[$fqcn])) { |
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438 | return $this->classExists[$fqcn]; |
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439 | } |
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440 | |||
441 | // first check if the class already exists, maybe loaded through another AnnotationReader |
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442 | if (class_exists($fqcn, false)) { |
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443 | return $this->classExists[$fqcn] = true; |
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444 | } |
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445 | |||
446 | // final check, does this class exist? |
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447 | return $this->classExists[$fqcn] = AnnotationRegistry::loadAnnotationClass($fqcn); |
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448 | } |
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449 | |||
450 | /** |
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451 | * Collects parsing metadata for a given annotation class |
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452 | * |
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453 | * @param string $name The annotation name |
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454 | * |
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455 | * @return void |
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456 | */ |
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457 | private function collectAnnotationMetadata($name) |
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458 | { |
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459 | if (self::$metadataParser === null) { |
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460 | self::$metadataParser = new self(); |
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461 | |||
462 | self::$metadataParser->setIgnoreNotImportedAnnotations(true); |
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463 | self::$metadataParser->setIgnoredAnnotationNames($this->ignoredAnnotationNames); |
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464 | self::$metadataParser->setImports(array( |
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465 | 'enum' => 'Doctrine\Common\Annotations\Annotation\Enum', |
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466 | 'target' => 'Doctrine\Common\Annotations\Annotation\Target', |
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467 | 'attribute' => 'Doctrine\Common\Annotations\Annotation\Attribute', |
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468 | 'attributes' => 'Doctrine\Common\Annotations\Annotation\Attributes' |
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469 | )); |
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470 | |||
471 | AnnotationRegistry::registerFile(__DIR__ . '/Annotation/Enum.php'); |
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472 | AnnotationRegistry::registerFile(__DIR__ . '/Annotation/Target.php'); |
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473 | AnnotationRegistry::registerFile(__DIR__ . '/Annotation/Attribute.php'); |
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474 | AnnotationRegistry::registerFile(__DIR__ . '/Annotation/Attributes.php'); |
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475 | } |
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476 | |||
477 | $class = new \ReflectionClass($name); |
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478 | $docComment = $class->getDocComment(); |
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479 | |||
480 | // Sets default values for annotation metadata |
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481 | $metadata = array( |
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482 | 'default_property' => null, |
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483 | 'has_constructor' => (null !== $constructor = $class->getConstructor()) && $constructor->getNumberOfParameters() > 0, |
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484 | 'properties' => array(), |
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485 | 'property_types' => array(), |
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486 | 'attribute_types' => array(), |
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487 | 'targets_literal' => null, |
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488 | 'targets' => Target::TARGET_ALL, |
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489 | 'is_annotation' => false !== strpos($docComment, '@Annotation'), |
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490 | ); |
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491 | |||
492 | // verify that the class is really meant to be an annotation |
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493 | if ($metadata['is_annotation']) { |
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494 | self::$metadataParser->setTarget(Target::TARGET_CLASS); |
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495 | |||
496 | foreach (self::$metadataParser->parse($docComment, 'class @' . $name) as $annotation) { |
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497 | if ($annotation instanceof Target) { |
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498 | $metadata['targets'] = $annotation->targets; |
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499 | $metadata['targets_literal'] = $annotation->literal; |
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500 | |||
501 | continue; |
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502 | } |
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503 | |||
504 | if ($annotation instanceof Attributes) { |
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505 | foreach ($annotation->value as $attribute) { |
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506 | $this->collectAttributeTypeMetadata($metadata, $attribute); |
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507 | } |
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508 | } |
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509 | } |
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510 | |||
511 | // if not has a constructor will inject values into public properties |
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512 | if (false === $metadata['has_constructor']) { |
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513 | // collect all public properties |
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514 | foreach ($class->getProperties(\ReflectionProperty::IS_PUBLIC) as $property) { |
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515 | $metadata['properties'][$property->name] = $property->name; |
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516 | |||
517 | if (false === ($propertyComment = $property->getDocComment())) { |
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518 | continue; |
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519 | } |
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520 | |||
521 | $attribute = new Attribute(); |
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522 | |||
523 | $attribute->required = (false !== strpos($propertyComment, '@Required')); |
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524 | $attribute->name = $property->name; |
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525 | $attribute->type = (false !== strpos($propertyComment, '@var') && preg_match('/@var\s+([^\s]+)/',$propertyComment, $matches)) |
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526 | ? $matches[1] |
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527 | : 'mixed'; |
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528 | |||
529 | $this->collectAttributeTypeMetadata($metadata, $attribute); |
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530 | |||
531 | // checks if the property has @Enum |
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532 | if (false !== strpos($propertyComment, '@Enum')) { |
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533 | $context = 'property ' . $class->name . "::\$" . $property->name; |
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534 | |||
535 | self::$metadataParser->setTarget(Target::TARGET_PROPERTY); |
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536 | |||
537 | foreach (self::$metadataParser->parse($propertyComment, $context) as $annotation) { |
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538 | if ( ! $annotation instanceof Enum) { |
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539 | continue; |
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540 | } |
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541 | |||
542 | $metadata['enum'][$property->name]['value'] = $annotation->value; |
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543 | $metadata['enum'][$property->name]['literal'] = ( ! empty($annotation->literal)) |
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544 | ? $annotation->literal |
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545 | : $annotation->value; |
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546 | } |
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547 | } |
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548 | } |
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549 | |||
550 | // choose the first property as default property |
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551 | $metadata['default_property'] = reset($metadata['properties']); |
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552 | } |
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553 | } |
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554 | |||
555 | self::$annotationMetadata[$name] = $metadata; |
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556 | } |
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557 | |||
558 | /** |
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559 | * Collects parsing metadata for a given attribute. |
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560 | * |
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561 | * @param array $metadata |
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562 | * @param Attribute $attribute |
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563 | * |
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564 | * @return void |
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565 | */ |
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566 | private function collectAttributeTypeMetadata(&$metadata, Attribute $attribute) |
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567 | { |
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568 | // handle internal type declaration |
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569 | $type = isset(self::$typeMap[$attribute->type]) |
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570 | ? self::$typeMap[$attribute->type] |
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571 | : $attribute->type; |
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572 | |||
573 | // handle the case if the property type is mixed |
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574 | if ('mixed' === $type) { |
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575 | return; |
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576 | } |
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577 | |||
578 | // Evaluate type |
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579 | switch (true) { |
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580 | // Checks if the property has array<type> |
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581 | View Code Duplication | case (false !== $pos = strpos($type, '<')): |
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582 | $arrayType = substr($type, $pos + 1, -1); |
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583 | $type = 'array'; |
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584 | |||
585 | if (isset(self::$typeMap[$arrayType])) { |
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586 | $arrayType = self::$typeMap[$arrayType]; |
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587 | } |
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588 | |||
589 | $metadata['attribute_types'][$attribute->name]['array_type'] = $arrayType; |
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590 | break; |
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591 | |||
592 | // Checks if the property has type[] |
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593 | View Code Duplication | case (false !== $pos = strrpos($type, '[')): |
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594 | $arrayType = substr($type, 0, $pos); |
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595 | $type = 'array'; |
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596 | |||
597 | if (isset(self::$typeMap[$arrayType])) { |
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598 | $arrayType = self::$typeMap[$arrayType]; |
||
599 | } |
||
600 | |||
601 | $metadata['attribute_types'][$attribute->name]['array_type'] = $arrayType; |
||
602 | break; |
||
603 | } |
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604 | |||
605 | $metadata['attribute_types'][$attribute->name]['type'] = $type; |
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606 | $metadata['attribute_types'][$attribute->name]['value'] = $attribute->type; |
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607 | $metadata['attribute_types'][$attribute->name]['required'] = $attribute->required; |
||
608 | } |
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609 | |||
610 | /** |
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611 | * Annotations ::= Annotation {[ "*" ]* [Annotation]}* |
||
612 | * |
||
613 | * @return array |
||
614 | */ |
||
615 | private function Annotations() |
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616 | { |
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617 | $annotations = array(); |
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618 | |||
619 | while (null !== $this->lexer->lookahead) { |
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620 | if (DocLexer::T_AT !== $this->lexer->lookahead['type']) { |
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621 | $this->lexer->moveNext(); |
||
622 | continue; |
||
623 | } |
||
624 | |||
625 | // make sure the @ is preceded by non-catchable pattern |
||
626 | if (null !== $this->lexer->token && $this->lexer->lookahead['position'] === $this->lexer->token['position'] + strlen($this->lexer->token['value'])) { |
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627 | $this->lexer->moveNext(); |
||
628 | continue; |
||
629 | } |
||
630 | |||
631 | // make sure the @ is followed by either a namespace separator, or |
||
632 | // an identifier token |
||
633 | if ((null === $peek = $this->lexer->glimpse()) |
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634 | || (DocLexer::T_NAMESPACE_SEPARATOR !== $peek['type'] && !in_array($peek['type'], self::$classIdentifiers, true)) |
||
635 | || $peek['position'] !== $this->lexer->lookahead['position'] + 1) { |
||
636 | $this->lexer->moveNext(); |
||
637 | continue; |
||
638 | } |
||
639 | |||
640 | $this->isNestedAnnotation = false; |
||
641 | if (false !== $annot = $this->Annotation()) { |
||
642 | $annotations[] = $annot; |
||
643 | } |
||
644 | } |
||
645 | |||
646 | return $annotations; |
||
647 | } |
||
648 | |||
649 | /** |
||
650 | * Annotation ::= "@" AnnotationName MethodCall |
||
651 | * AnnotationName ::= QualifiedName | SimpleName |
||
652 | * QualifiedName ::= NameSpacePart "\" {NameSpacePart "\"}* SimpleName |
||
653 | * NameSpacePart ::= identifier | null | false | true |
||
654 | * SimpleName ::= identifier | null | false | true |
||
655 | * |
||
656 | * @return mixed False if it is not a valid annotation. |
||
657 | * |
||
658 | * @throws AnnotationException |
||
659 | */ |
||
660 | private function Annotation() |
||
816 | |||
817 | /** |
||
818 | * MethodCall ::= ["(" [Values] ")"] |
||
819 | * |
||
820 | * @return array |
||
821 | */ |
||
822 | private function MethodCall() |
||
823 | { |
||
824 | $values = array(); |
||
825 | |||
826 | if ( ! $this->lexer->isNextToken(DocLexer::T_OPEN_PARENTHESIS)) { |
||
840 | |||
841 | /** |
||
842 | * Values ::= Array | Value {"," Value}* [","] |
||
843 | * |
||
844 | * @return array |
||
845 | */ |
||
846 | private function Values() |
||
885 | |||
886 | /** |
||
887 | * Constant ::= integer | string | float | boolean |
||
888 | * |
||
889 | * @return mixed |
||
890 | * |
||
891 | * @throws AnnotationException |
||
892 | */ |
||
893 | private function Constant() |
||
950 | |||
951 | /** |
||
952 | * Identifier ::= string |
||
953 | * |
||
954 | * @return string |
||
955 | */ |
||
956 | private function Identifier() |
||
978 | |||
979 | /** |
||
980 | * Value ::= PlainValue | FieldAssignment |
||
981 | * |
||
982 | * @return mixed |
||
983 | */ |
||
984 | private function Value() |
||
994 | |||
995 | /** |
||
996 | * PlainValue ::= integer | string | float | boolean | Array | Annotation |
||
997 | * |
||
998 | * @return mixed |
||
999 | */ |
||
1000 | private function PlainValue() |
||
1043 | |||
1044 | /** |
||
1045 | * FieldAssignment ::= FieldName "=" PlainValue |
||
1046 | * FieldName ::= identifier |
||
1047 | * |
||
1048 | * @return array |
||
1049 | */ |
||
1050 | private function FieldAssignment() |
||
1063 | |||
1064 | /** |
||
1065 | * Array ::= "{" ArrayEntry {"," ArrayEntry}* [","] "}" |
||
1066 | * |
||
1067 | * @return array |
||
1068 | */ |
||
1069 | private function Arrayx() |
||
1109 | |||
1110 | /** |
||
1111 | * ArrayEntry ::= Value | KeyValuePair |
||
1112 | * KeyValuePair ::= Key ("=" | ":") PlainValue | Constant |
||
1113 | * Key ::= string | integer | Constant |
||
1114 | * |
||
1115 | * @return array |
||
1116 | */ |
||
1117 | private function ArrayEntry() |
||
1138 | } |
||
1139 |
This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.
Consider making the comparison explicit by using
empty(..)
or! empty(...)
instead.