Complex classes like AbstractFileDecorator 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 AbstractFileDecorator, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 18 | abstract class AbstractFileDecorator extends File |
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| 19 | { |
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| 20 | /** |
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| 21 | * The CodeSniffer file |
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| 22 | * |
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| 23 | * @var File |
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| 24 | */ |
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| 25 | private $baseFile; |
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| 26 | |||
| 27 | /** |
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| 28 | * File constructor. |
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| 29 | * |
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| 30 | * @param File $baseFile CodeSniffer file |
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| 31 | */ |
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| 32 | public function __construct(File $baseFile) |
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| 38 | |||
| 39 | /** |
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| 40 | * Returns the wrapped classes method result. |
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| 41 | * |
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| 42 | * @param string $method |
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| 43 | * @param array $args |
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| 44 | * |
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| 45 | * @return mixed |
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| 46 | */ |
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| 47 | public function __call(string $method, array $args = []) |
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| 51 | |||
| 52 | /** |
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| 53 | * Records an error against a specific token in the file. |
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| 54 | * |
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| 55 | * @param string $error The error message. |
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| 56 | * @param int $stackPtr The stack position where the error occurred. |
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| 57 | * @param string $code A violation code unique to the sniff message. |
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| 58 | * @param array $data Replacements for the error message. |
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| 59 | * @param int $severity The severity level for this error. A value of 0 |
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| 60 | * will be converted into the default severity level. |
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| 61 | * @param boolean $fixable Can the error be fixed by the sniff? |
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| 62 | * |
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| 63 | * @return boolean |
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| 64 | */ |
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| 65 | public function addError( |
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| 75 | |||
| 76 | /** |
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| 77 | * Records an error against a specific line in the file. |
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| 78 | * |
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| 79 | * @param string $error The error message. |
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| 80 | * @param int $line The line on which the error occurred. |
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| 81 | * @param string $code A violation code unique to the sniff message. |
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| 82 | * @param array $data Replacements for the error message. |
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| 83 | * @param int $severity The severity level for this error. A value of 0 |
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| 84 | * will be converted into the default severity level. |
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| 85 | * |
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| 86 | * @return boolean |
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| 87 | */ |
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| 88 | public function addErrorOnLine( |
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| 97 | |||
| 98 | /** |
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| 99 | * Records a fixable error against a specific token in the file. |
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| 100 | * |
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| 101 | * Returns true if the error was recorded and should be fixed. |
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| 102 | * |
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| 103 | * @param string $error The error message. |
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| 104 | * @param int $stackPtr The stack position where the error occurred. |
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| 105 | * @param string $code A violation code unique to the sniff message. |
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| 106 | * @param array $data Replacements for the error message. |
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| 107 | * @param int $severity The severity level for this error. A value of 0 |
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| 108 | * will be converted into the default severity level. |
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| 109 | * |
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| 110 | * @return boolean |
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| 111 | */ |
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| 112 | public function addFixableError( |
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| 121 | |||
| 122 | /** |
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| 123 | * Records a fixable warning against a specific token in the file. |
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| 124 | * |
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| 125 | * Returns true if the warning was recorded and should be fixed. |
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| 126 | * |
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| 127 | * @param string $warning The error message. |
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| 128 | * @param int $stackPtr The stack position where the error occurred. |
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| 129 | * @param string $code A violation code unique to the sniff message. |
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| 130 | * @param array $data Replacements for the warning message. |
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| 131 | * @param int $severity The severity level for this warning. A value of 0 |
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| 132 | * will be converted into the default severity level. |
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| 133 | * |
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| 134 | * @return boolean |
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| 135 | */ |
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| 136 | public function addFixableWarning( |
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| 145 | |||
| 146 | /** |
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| 147 | * Adds an error to the error stack. |
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| 148 | * |
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| 149 | * @param boolean $error Is this an error message? |
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| 150 | * @param string $message The text of the message. |
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| 151 | * @param int $line The line on which the message occurred. |
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| 152 | * @param int $column The column at which the message occurred. |
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| 153 | * @param string $code A violation code unique to the sniff message. |
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| 154 | * @param array $data Replacements for the message. |
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| 155 | * @param int $severity The severity level for this message. A value of 0 |
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| 156 | * will be converted into the default severity level. |
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| 157 | * @param boolean $fixable Can the problem be fixed by the sniff? |
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| 158 | * |
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| 159 | * @return boolean |
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| 160 | */ |
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| 161 | protected function addMessage($error, $message, $line, $column, $code, $data, $severity, $fixable) |
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| 165 | |||
| 166 | /** |
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| 167 | * Records a warning against a specific token in the file. |
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| 168 | * |
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| 169 | * @param string $warning The error message. |
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| 170 | * @param int $stackPtr The stack position where the error occurred. |
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| 171 | * @param string $code A violation code unique to the sniff message. |
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| 172 | * @param array $data Replacements for the warning message. |
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| 173 | * @param int $severity The severity level for this warning. A value of 0 |
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| 174 | * will be converted into the default severity level. |
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| 175 | * @param boolean $fixable Can the warning be fixed by the sniff? |
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| 176 | * |
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| 177 | * @return boolean |
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| 178 | */ |
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| 179 | public function addWarning( |
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| 189 | |||
| 190 | /** |
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| 191 | * Records a warning against a specific token in the file. |
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| 192 | * |
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| 193 | * @param string $warning The error message. |
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| 194 | * @param int $line The line on which the warning occurred. |
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| 195 | * @param string $code A violation code unique to the sniff message. |
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| 196 | * @param array $data Replacements for the warning message. |
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| 197 | * @param int $severity The severity level for this warning. A value of 0 will |
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| 198 | * will be converted into the default severity level. |
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| 199 | * |
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| 200 | * @return boolean |
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| 201 | */ |
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| 202 | public function addWarningOnLine( |
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| 211 | |||
| 212 | /** |
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| 213 | * Remove vars stored in this file that are no longer required. |
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| 214 | * |
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| 215 | * @return void |
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| 216 | */ |
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| 217 | public function cleanUp() |
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| 221 | |||
| 222 | /** |
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| 223 | * Disables caching of this file. |
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| 224 | * |
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| 225 | * @return void |
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| 226 | */ |
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| 227 | public function disableCaching() |
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| 231 | |||
| 232 | /** |
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| 233 | * Returns the position of the last non-whitespace token in a statement. |
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| 234 | * |
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| 235 | * @param int $start The position to start searching from in the token stack. |
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| 236 | * @param int|array $ignore Token types that should not be considered stop points. |
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| 237 | * |
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| 238 | * @return int |
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| 239 | */ |
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| 240 | public function findEndOfStatement($start, $ignore = null) |
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| 244 | |||
| 245 | /** |
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| 246 | * Returns the name of the class that the specified class extends. |
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| 247 | * (works for classes, anonymous classes and interfaces) |
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| 248 | * |
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| 249 | * Returns FALSE on error or if there is no extended class name. |
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| 250 | * |
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| 251 | * @param int $stackPtr The stack position of the class. |
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| 252 | * |
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| 253 | * @return string|false |
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| 254 | */ |
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| 255 | public function findExtendedClassName($stackPtr) |
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| 259 | |||
| 260 | /** |
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| 261 | * Returns the position of the first token on a line, matching given type. |
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| 262 | * |
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| 263 | * Returns false if no token can be found. |
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| 264 | * |
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| 265 | * @param int|array $types The type(s) of tokens to search for. |
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| 266 | * @param int $start The position to start searching from in the |
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| 267 | * token stack. The first token matching on |
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| 268 | * this line before this token will be returned. |
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| 269 | * @param bool $exclude If true, find the token that is NOT of |
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| 270 | * the types specified in $types. |
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| 271 | * @param string $value The value that the token must be equal to. |
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| 272 | * If value is omitted, tokens with any value will |
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| 273 | * be returned. |
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| 274 | * |
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| 275 | * @return int | bool |
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| 276 | */ |
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| 277 | public function findFirstOnLine($types, $start, $exclude = false, $value = null) |
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| 281 | |||
| 282 | /** |
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| 283 | * Returns the names of the interfaces that the specified class implements. |
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| 284 | * |
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| 285 | * Returns FALSE on error or if there are no implemented interface names. |
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| 286 | * |
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| 287 | * @param int $stackPtr The stack position of the class. |
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| 288 | * |
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| 289 | * @return array|false |
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| 290 | */ |
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| 291 | public function findImplementedInterfaceNames($stackPtr) |
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| 295 | |||
| 296 | /** |
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| 297 | * Returns the position of the next specified token(s). |
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| 298 | * |
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| 299 | * If a value is specified, the next token of the specified type(s) |
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| 300 | * containing the specified value will be returned. |
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| 301 | * |
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| 302 | * Returns false if no token can be found. |
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| 303 | * |
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| 304 | * @param int|array $types The type(s) of tokens to search for. |
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| 305 | * @param int $start The position to start searching from in the |
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| 306 | * token stack. |
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| 307 | * @param int $end The end position to fail if no token is found. |
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| 308 | * if not specified or null, end will default to |
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| 309 | * the end of the token stack. |
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| 310 | * @param bool $exclude If true, find the next token that is NOT of |
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| 311 | * a type specified in $types. |
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| 312 | * @param string $value The value that the token(s) must be equal to. |
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| 313 | * If value is omitted, tokens with any value will |
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| 314 | * be returned. |
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| 315 | * @param bool $local If true, tokens outside the current statement |
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| 316 | * will not be checked. i.e., checking will stop |
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| 317 | * at the next semi-colon found. |
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| 318 | * |
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| 319 | * @return int|bool |
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| 320 | * @see findPrevious() |
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| 321 | */ |
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| 322 | public function findNext( |
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| 332 | |||
| 333 | /** |
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| 334 | * Returns the position of the previous specified token(s). |
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| 335 | * |
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| 336 | * If a value is specified, the previous token of the specified type(s) |
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| 337 | * containing the specified value will be returned. |
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| 338 | * |
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| 339 | * Returns false if no token can be found. |
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| 340 | * |
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| 341 | * @param int|array $types The type(s) of tokens to search for. |
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| 342 | * @param int $start The position to start searching from in the |
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| 343 | * token stack. |
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| 344 | * @param int $end The end position to fail if no token is found. |
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| 345 | * if not specified or null, end will default to |
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| 346 | * the start of the token stack. |
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| 347 | * @param bool $exclude If true, find the previous token that is NOT of |
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| 348 | * the types specified in $types. |
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| 349 | * @param string $value The value that the token(s) must be equal to. |
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| 350 | * If value is omitted, tokens with any value will |
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| 351 | * be returned. |
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| 352 | * @param bool $local If true, tokens outside the current statement |
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| 353 | * will not be checked. IE. checking will stop |
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| 354 | * at the previous semi-colon found. |
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| 355 | * |
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| 356 | * @return int|bool |
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| 357 | * @see findNext() |
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| 358 | */ |
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| 359 | public function findPrevious( |
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| 369 | |||
| 370 | /** |
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| 371 | * Returns the position of the first non-whitespace token in a statement. |
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| 372 | * |
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| 373 | * @param int $start The position to start searching from in the token stack. |
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| 374 | * @param int|array $ignore Token types that should not be considered stop points. |
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| 375 | * |
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| 376 | * @return int |
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| 377 | */ |
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| 378 | public function findStartOfStatement($start, $ignore = null) |
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| 382 | |||
| 383 | /** |
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| 384 | * Returns the original file for this decorator |
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| 385 | * |
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| 386 | * @return File The original file wrapper. |
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| 387 | */ |
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| 388 | public function getBaseFile(): File |
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| 392 | |||
| 393 | /** |
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| 394 | * Returns the visibility and implementation properties of a class. |
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| 395 | * |
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| 396 | * The format of the array is: |
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| 397 | * <code> |
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| 398 | * array( |
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| 399 | * 'is_abstract' => false, // true if the abstract keyword was found. |
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| 400 | * 'is_final' => false, // true if the final keyword was found. |
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| 401 | * ); |
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| 402 | * </code> |
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| 403 | * |
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| 404 | * @param int $stackPtr The position in the stack of the T_CLASS token to |
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| 405 | * acquire the properties for. |
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| 406 | * |
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| 407 | * @return array |
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| 408 | * @throws \PHP_CodeSniffer\Exceptions\TokenizerException If the specified position is not a |
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| 409 | * T_CLASS token. |
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| 410 | */ |
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| 411 | public function getClassProperties($stackPtr) |
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| 415 | |||
| 416 | /** |
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| 417 | * Return the position of the condition for the passed token. |
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| 418 | * |
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| 419 | * Returns FALSE if the token does not have the condition. |
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| 420 | * |
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| 421 | * @param int $stackPtr The position of the token we are checking. |
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| 422 | * @param int $type The type of token to search for. |
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| 423 | * |
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| 424 | * @return int |
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| 425 | */ |
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| 426 | public function getCondition($stackPtr, $type) |
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| 430 | |||
| 431 | /** |
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| 432 | * Returns the declaration names for classes, interfaces, traits, and functions. |
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| 433 | * |
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| 434 | * @param int $stackPtr The position of the declaration token which |
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| 435 | * declared the class, interface, trait, or function. |
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| 436 | * |
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| 437 | * @return string|null The name of the class, interface, trait, or function; |
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| 438 | * or NULL if the function or class is anonymous. |
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| 439 | * @throws \PHP_CodeSniffer\Exceptions\RuntimeException If the specified token is not of type |
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| 440 | * T_FUNCTION, T_CLASS, T_ANON_CLASS, |
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| 441 | * T_CLOSURE, T_TRAIT, or T_INTERFACE. |
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| 442 | */ |
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| 443 | public function getDeclarationName($stackPtr) |
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| 447 | |||
| 448 | /** |
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| 449 | * Returns the number of errors raised. |
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| 450 | * |
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| 451 | * @return int |
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| 452 | */ |
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| 453 | public function getErrorCount() |
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| 457 | |||
| 458 | /** |
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| 459 | * Returns the errors raised from processing this file. |
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| 460 | * |
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| 461 | * @return array |
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| 462 | */ |
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| 463 | public function getErrors() |
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| 467 | |||
| 468 | /** |
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| 469 | * Returns the absolute filename of this file. |
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| 470 | * |
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| 471 | * @return string |
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| 472 | */ |
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| 473 | public function getFilename() |
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| 477 | |||
| 478 | /** |
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| 479 | * Returns the number of fixable errors/warnings raised. |
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| 480 | * |
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| 481 | * @return int |
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| 482 | */ |
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| 483 | public function getFixableCount() |
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| 487 | |||
| 488 | /** |
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| 489 | * Returns the number of fixed errors/warnings. |
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| 490 | * |
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| 491 | * @return int |
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| 492 | */ |
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| 493 | public function getFixedCount() |
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| 497 | |||
| 498 | /** |
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| 499 | * Returns the list of ignored lines. |
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| 500 | * |
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| 501 | * @return array |
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| 502 | */ |
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| 503 | public function getIgnoredLines() |
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| 507 | |||
| 508 | /** |
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| 509 | * Returns the visibility and implementation properties of the class member |
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| 510 | * variable found at the specified position in the stack. |
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| 511 | * |
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| 512 | * The format of the array is: |
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| 513 | * |
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| 514 | * <code> |
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| 515 | * array( |
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| 516 | * 'scope' => 'public', // public protected or protected. |
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| 517 | * 'scope_specified' => false, // true if the scope was explicitely specified. |
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| 518 | * 'is_static' => false, // true if the static keyword was found. |
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| 519 | * ); |
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| 520 | * </code> |
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| 521 | * |
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| 522 | * @param int $stackPtr The position in the stack of the T_VARIABLE token to |
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| 523 | * acquire the properties for. |
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| 524 | * |
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| 525 | * @return array |
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| 526 | * @throws \PHP_CodeSniffer\Exceptions\TokenizerException If the specified position is not a |
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| 527 | * T_VARIABLE token, or if the position is not |
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| 528 | * a class member variable. |
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| 529 | */ |
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| 530 | public function getMemberProperties($stackPtr) |
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| 534 | |||
| 535 | /** |
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| 536 | * Returns the method parameters for the specified function token. |
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| 537 | * |
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| 538 | * Each parameter is in the following format: |
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| 539 | * |
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| 540 | * <code> |
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| 541 | * 0 => array( |
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| 542 | * 'name' => '$var', // The variable name. |
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| 543 | * 'token' => integer, // The stack pointer to the variable name. |
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| 544 | * 'content' => string, // The full content of the variable definition. |
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| 545 | * 'pass_by_reference' => boolean, // Is the variable passed by reference? |
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| 546 | * 'variable_length' => boolean, // Is the param of variable length through use of `...` ? |
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| 547 | * 'type_hint' => string, // The type hint for the variable. |
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| 548 | * 'type_hint_token' => integer, // The stack pointer to the type hint |
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| 549 | * // or false if there is no type hint. |
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| 550 | * 'nullable_type' => boolean, // Is the variable using a nullable type? |
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| 551 | * ) |
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| 552 | * </code> |
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| 553 | * |
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| 554 | * Parameters with default values have an additional array index of |
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| 555 | * 'default' with the value of the default as a string. |
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| 556 | * |
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| 557 | * @param int $stackPtr The position in the stack of the function token |
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| 558 | * to acquire the parameters for. |
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| 559 | * |
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| 560 | * @return array |
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| 561 | * @throws \PHP_CodeSniffer\Exceptions\TokenizerException If the specified $stackPtr is not of |
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| 562 | * type T_FUNCTION or T_CLOSURE. |
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| 563 | */ |
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| 564 | public function getMethodParameters($stackPtr) |
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| 568 | |||
| 569 | |||
| 570 | /** |
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| 571 | * Returns the visibility and implementation properties of a method. |
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| 572 | * |
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| 573 | * The format of the array is: |
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| 574 | * <code> |
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| 575 | * array( |
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| 576 | * 'scope' => 'public', // public protected or protected |
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| 577 | * 'scope_specified' => true, // true is scope keyword was found. |
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| 578 | * 'return_type' => '', // the return type of the method. |
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| 579 | * 'return_type_token' => integer, // The stack pointer to the start of the return type |
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| 580 | * // or false if there is no return type. |
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| 581 | * 'nullable_return_type' => false, // true if the return type is nullable. |
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| 582 | * 'is_abstract' => false, // true if the abstract keyword was found. |
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| 583 | * 'is_final' => false, // true if the final keyword was found. |
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| 584 | * 'is_static' => false, // true if the static keyword was found. |
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| 585 | * ); |
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| 586 | * </code> |
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| 587 | * |
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| 588 | * @param int $stackPtr The position in the stack of the function token to |
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| 589 | * acquire the properties for. |
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| 590 | * |
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| 591 | * @return array |
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| 592 | * @throws \PHP_CodeSniffer\Exceptions\TokenizerException If the specified position is not a |
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| 593 | * T_FUNCTION token. |
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| 594 | */ |
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| 595 | public function getMethodProperties($stackPtr) |
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| 599 | |||
| 600 | /** |
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| 601 | * Returns the metrics found while processing this file. |
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| 602 | * |
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| 603 | * @return array |
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| 604 | */ |
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| 605 | public function getMetrics() |
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| 609 | |||
| 610 | /** |
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| 611 | * Returns the number of successes recorded. |
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| 612 | * |
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| 613 | * @return int |
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| 614 | */ |
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| 615 | public function getSuccessCount() |
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| 619 | |||
| 620 | /** |
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| 621 | * Returns the token stack for this file. |
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| 622 | * |
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| 623 | * @return array |
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| 624 | */ |
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| 625 | public function getTokens() |
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| 629 | |||
| 630 | /** |
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| 631 | * Returns the content of the tokens from the specified start position in |
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| 632 | * the token stack for the specified length. |
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| 633 | * |
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| 634 | * @param int $start The position to start from in the token stack. |
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| 635 | * @param int $length The length of tokens to traverse from the start pos. |
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| 636 | * @param int $origContent Whether the original content or the tab replaced |
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| 637 | * content should be used. |
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| 638 | * |
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| 639 | * @return string The token contents. |
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| 640 | */ |
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| 641 | public function getTokensAsString($start, $length, $origContent = false) |
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| 645 | |||
| 646 | /** |
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| 647 | * Returns the number of warnings raised. |
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| 648 | * |
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| 649 | * @return int |
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| 650 | */ |
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| 651 | public function getWarningCount() |
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| 655 | |||
| 656 | /** |
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| 657 | * Returns the warnings raised from processing this file. |
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| 658 | * |
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| 659 | * @return array |
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| 660 | */ |
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| 661 | public function getWarnings() |
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| 665 | |||
| 666 | /** |
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| 667 | * Determine if the passed token has a condition of one of the passed types. |
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| 668 | * |
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| 669 | * @param int $stackPtr The position of the token we are checking. |
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| 670 | * @param int|array $types The type(s) of tokens to search for. |
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| 671 | * |
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| 672 | * @return boolean |
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| 673 | */ |
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| 674 | public function hasCondition($stackPtr, $types) |
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| 678 | |||
| 679 | /** |
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| 680 | * Determine if the passed token is a reference operator. |
||
| 681 | * |
||
| 682 | * Returns true if the specified token position represents a reference. |
||
| 683 | * Returns false if the token represents a bitwise operator. |
||
| 684 | * |
||
| 685 | * @param int $stackPtr The position of the T_BITWISE_AND token. |
||
| 686 | * |
||
| 687 | * @return boolean |
||
| 688 | */ |
||
| 689 | public function isReference($stackPtr) |
||
| 693 | |||
| 694 | /** |
||
| 695 | * Tokenizes the file and prepares it for the test run. |
||
| 696 | * |
||
| 697 | * @return void |
||
| 698 | */ |
||
| 699 | public function parse() |
||
| 703 | |||
| 704 | /** |
||
| 705 | * Starts the stack traversal and tells listeners when tokens are found. |
||
| 706 | * |
||
| 707 | * @return void |
||
| 708 | */ |
||
| 709 | public function process() |
||
| 713 | |||
| 714 | /** |
||
| 715 | * Record a metric about the file being examined. |
||
| 716 | * |
||
| 717 | * @param int $stackPtr The stack position where the metric was recorded. |
||
| 718 | * @param string $metric The name of the metric being recorded. |
||
| 719 | * @param string $value The value of the metric being recorded. |
||
| 720 | * |
||
| 721 | * @return boolean |
||
| 722 | */ |
||
| 723 | public function recordMetric($stackPtr, $metric, $value) |
||
| 727 | |||
| 728 | /** |
||
| 729 | * Reloads the content of the file. |
||
| 730 | * |
||
| 731 | * By default, we have no idea where our content comes from, so we can't do anything. |
||
| 732 | * |
||
| 733 | * @return void |
||
| 734 | */ |
||
| 735 | public function reloadContent() |
||
| 739 | |||
| 740 | /** |
||
| 741 | * Set the content of the file. |
||
| 742 | * |
||
| 743 | * Setting the content also calculates the EOL char being used. |
||
| 744 | * |
||
| 745 | * @param string $content The file content. |
||
| 746 | * |
||
| 747 | * @return void |
||
| 748 | */ |
||
| 749 | public function setContent($content) |
||
| 753 | |||
| 754 | /** |
||
| 755 | * We need to clone the properties of the base file to this. A magic getter on inherited props does not work. |
||
| 756 | * |
||
| 757 | * @param File $baseFile |
||
| 758 | * |
||
| 759 | * @return void |
||
| 760 | */ |
||
| 761 | private function takeProperties(File $baseFile): void |
||
| 769 | } |
Let’s assume that you have a directory layout like this:
. |-- OtherDir | |-- Bar.php | `-- Foo.php `-- SomeDir `-- Foo.phpand let’s assume the following content of
Bar.php:If both files
OtherDir/Foo.phpandSomeDir/Foo.phpare loaded in the same runtime, you will see a PHP error such as the following:PHP Fatal error: Cannot use SomeDir\Foo as Foo because the name is already in use in OtherDir/Foo.phpHowever, as
OtherDir/Foo.phpdoes not necessarily have to be loaded and the error is only triggered if it is loaded beforeOtherDir/Bar.php, this problem might go unnoticed for a while. In order to prevent this error from surfacing, you must import the namespace with a different alias: