1 | <?php |
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2 | |||
3 | namespace Elgg; |
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4 | |||
5 | use Elgg\Di\DiContainer; |
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6 | use Elgg\HooksRegistrationService\Event as HrsEvent; |
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7 | use Elgg\HooksRegistrationService\Hook as HrsHook; |
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8 | |||
9 | /** |
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10 | * Helpers for providing callable-based APIs |
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11 | * |
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12 | * getType() uses code from Zend\Code\Reflection\ParameterReflection::detectType. |
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13 | * https://github.com/zendframework/zend-code/blob/master/src/Reflection/ParameterReflection.php |
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14 | * |
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15 | * @copyright 2005-2016 Zend Technologies USA Inc. (http://www.zend.com) |
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16 | * @license http://framework.zend.com/license/new-bsd New BSD License |
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17 | * |
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18 | * @internal |
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19 | */ |
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20 | class HandlersService { |
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21 | |||
22 | /** |
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23 | * Keeps track of already reported deprecated arguments callback messages |
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24 | * |
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25 | * @var array |
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26 | */ |
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27 | private $deprecated_args_msgs = []; |
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28 | |||
29 | /** |
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30 | * Call the handler with the hook/event object |
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31 | * |
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32 | * @param callable $callable Callable |
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33 | * @param mixed $object Event object |
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34 | * @param array $args Arguments for legacy events/hooks |
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35 | * |
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36 | * @return array [success, result, object] |
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37 | */ |
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38 | 1103 | public function call($callable, $object, $args) { |
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39 | 1103 | $original = $callable; |
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40 | |||
41 | 1103 | $callable = $this->resolveCallable($callable); |
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42 | 1103 | if (!is_callable($callable)) { |
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43 | 3 | $type = is_string($object) ? $object : $object::EVENT_TYPE; |
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44 | 3 | $description = $type . " [{$args[0]}, {$args[1]}]"; |
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45 | 3 | $msg = "Handler for $description is not callable: " . $this->describeCallable($original); |
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46 | 3 | _elgg_services()->logger->warning($msg); |
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47 | |||
48 | 3 | return [false, null, $object]; |
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49 | } |
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50 | |||
51 | 1101 | $use_object = $this->acceptsObject($callable); |
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52 | 1101 | if ($use_object) { |
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53 | 1045 | if (is_string($object)) { |
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54 | 907 | switch ($object) { |
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55 | 907 | case 'hook' : |
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56 | 634 | $object = new HrsHook(elgg(), $args[0], $args[1], $args[2], $args[3]); |
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57 | 634 | break; |
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58 | |||
59 | 618 | case 'event' : |
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60 | 618 | $object = new HrsEvent(elgg(), $args[0], $args[1], $args[2]); |
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61 | 618 | break; |
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62 | |||
63 | case 'middleware' : |
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64 | case 'controller' : |
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65 | case 'action' : |
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66 | $object = new Request(elgg(), $args[0]); |
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67 | break; |
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68 | } |
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69 | } |
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70 | |||
71 | 1045 | $result = call_user_func($callable, $object); |
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72 | } else { |
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73 | // legacy arguments |
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74 | 248 | if ($this->getParamTypeForCallable($callable) !== null) { |
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75 | 59 | $described_callback = $this->describeCallable($callable); |
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76 | 59 | $msg = "Using legacy style hook and event callback arguments is deprecated. Used by: {$described_callback} for [{$args[0]}, {$args[1]}]."; |
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77 | |||
78 | 59 | $msg_hash = md5($msg); |
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79 | 59 | if (!in_array($msg_hash, $this->deprecated_args_msgs)) { |
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80 | 57 | elgg_deprecated_notice($msg, "3.1"); |
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81 | 57 | $this->deprecated_args_msgs[] = $msg_hash; |
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82 | } |
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83 | } |
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84 | |||
85 | 248 | $result = call_user_func_array($callable, $args); |
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86 | } |
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87 | |||
88 | 1089 | return [true, $result, $object]; |
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89 | } |
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90 | |||
91 | /** |
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92 | * Test is callback is callable |
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93 | * Unlike is_callable(), this function also tests invokable classes |
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94 | * |
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95 | * @see is_callable() |
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96 | * |
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97 | * @param mixed $callback Callable |
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98 | * @return bool |
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99 | */ |
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100 | 1 | public function isCallable($callback) { |
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101 | 1 | $callback = $this->resolveCallable($callback); |
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102 | 1 | return $callback && is_callable($callback); |
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103 | } |
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104 | |||
105 | /** |
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106 | * Get the reflection interface for a callable |
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107 | * |
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108 | * @param callable $callable Callable |
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109 | * |
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110 | * @return \ReflectionFunctionAbstract |
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111 | */ |
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112 | 1105 | public function getReflector($callable) { |
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113 | 1105 | if (is_string($callable)) { |
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114 | 780 | if (false !== strpos($callable, '::')) { |
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115 | 11 | $callable = explode('::', $callable); |
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116 | } else { |
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117 | // function |
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118 | 775 | return new \ReflectionFunction($callable); |
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119 | } |
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120 | } |
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121 | 680 | if (is_array($callable)) { |
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122 | 380 | return new \ReflectionMethod($callable[0], $callable[1]); |
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123 | } |
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124 | 465 | if ($callable instanceof \Closure) { |
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125 | 287 | return new \ReflectionFunction($callable); |
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126 | } |
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127 | 252 | if (is_object($callable)) { |
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128 | 252 | return new \ReflectionMethod($callable, '__invoke'); |
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129 | } |
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130 | |||
131 | throw new \InvalidArgumentException('invalid $callable'); |
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132 | } |
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133 | |||
134 | /** |
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135 | * Resolve a callable, possibly instantiating a class name |
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136 | * |
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137 | * @param callable|string $callable Callable or class name |
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138 | * |
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139 | * @return callable|null |
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140 | */ |
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141 | 1104 | private function resolveCallable($callable) { |
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142 | 1104 | if (is_callable($callable)) { |
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143 | 986 | return $callable; |
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144 | } |
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145 | |||
146 | 253 | if (is_string($callable) |
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147 | 253 | && preg_match(DiContainer::CLASS_NAME_PATTERN_53, $callable) |
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148 | 253 | && class_exists($callable)) { |
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149 | // @todo Eventually a more advanced DIC could auto-inject dependencies |
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150 | 250 | $callable = new $callable; |
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151 | } |
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152 | |||
153 | 253 | return is_callable($callable) ? $callable : null; |
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154 | } |
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155 | |||
156 | /** |
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157 | * Should we pass this callable a Hook/Event object instead of the 2.0 arguments? |
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158 | * |
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159 | * @param callable $callable Callable |
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160 | * |
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161 | * @return bool |
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162 | */ |
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163 | 1101 | private function acceptsObject($callable) { |
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164 | // note: caching string callables didn't help any |
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165 | 1101 | $type = (string) $this->getParamTypeForCallable($callable); |
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166 | 1101 | if (0 === strpos($type, 'Elgg\\')) { |
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167 | // probably right. We can just assume and let PHP handle it |
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168 | 1045 | return true; |
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169 | } |
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170 | |||
171 | 248 | return false; |
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172 | } |
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173 | |||
174 | /** |
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175 | * Get the type for a parameter of a callable |
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176 | * |
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177 | * @param callable $callable Callable |
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178 | * @param int $index Index of argument |
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179 | * |
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180 | * @return null|string Empty string = no type, null = no parameter |
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181 | */ |
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182 | 1105 | public function getParamTypeForCallable($callable, $index = 0) { |
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183 | 1105 | $params = $this->getReflector($callable)->getParameters(); |
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184 | 1105 | if (!isset($params[$index])) { |
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185 | 196 | return null; |
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186 | } |
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187 | |||
188 | 1078 | return $this->getType($params[$index]); |
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189 | } |
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190 | |||
191 | /** |
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192 | * Get the type of a parameter |
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193 | * |
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194 | * @param \ReflectionParameter $param Parameter |
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195 | * |
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196 | * @return string |
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197 | */ |
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198 | 1078 | public function getType(\ReflectionParameter $param) { |
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199 | // @copyright Copyright (c) 2005-2016 Zend Technologies USA Inc. (http://www.zend.com) |
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200 | // @license http://framework.zend.com/license/new-bsd New BSD License |
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201 | |||
202 | 1078 | if (method_exists($param, 'getType') |
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203 | 1078 | && ($type = $param->getType()) |
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204 | 1078 | && $type->isBuiltin()) { |
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205 | 4 | return (string) $type; |
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206 | } |
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207 | |||
208 | // can be dropped when dropping PHP7 support: |
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209 | 1078 | if ($param->isArray()) { |
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210 | return 'array'; |
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211 | } |
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212 | |||
213 | // can be dropped when dropping PHP7 support: |
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214 | 1078 | if ($param->isCallable()) { |
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215 | return 'callable'; |
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216 | } |
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217 | |||
218 | // ReflectionParameter::__toString() doesn't require loading class |
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219 | 1078 | if (preg_match('~\[\s\<\w+?>\s([\S]+)~s', (string) $param, $m)) { |
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220 | 1078 | if ($m[1][0] !== '$') { |
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221 | 1049 | return $m[1]; |
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222 | } |
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223 | } |
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224 | |||
225 | 63 | return ''; |
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226 | } |
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227 | |||
228 | /** |
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229 | * Get a string description of a callback |
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230 | * |
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231 | * E.g. "function_name", "Static::method", "(ClassName)->method", "(Closure path/to/file.php:23)" |
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232 | * |
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233 | * @param mixed $callable Callable |
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234 | * @param string $file_root If provided, it will be removed from the beginning of file names |
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235 | * @return string |
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236 | */ |
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237 | 67 | public function describeCallable($callable, $file_root = '') { |
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238 | 67 | if (is_string($callable)) { |
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239 | 6 | return $callable; |
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240 | } |
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241 | 65 | if (is_array($callable) && array_keys($callable) === [0, 1] && is_string($callable[1])) { |
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242 | 17 | if (is_string($callable[0])) { |
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243 | 2 | return "{$callable[0]}::{$callable[1]}"; |
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244 | } |
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245 | 15 | return "(" . get_class($callable[0]) . ")->{$callable[1]}"; |
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246 | } |
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247 | 54 | if ($callable instanceof \Closure) { |
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248 | 54 | $ref = new \ReflectionFunction($callable); |
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249 | 54 | $file = $ref->getFileName(); |
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250 | 54 | $line = $ref->getStartLine(); |
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251 | |||
252 | 54 | if ($file_root && 0 === strpos($file, $file_root)) { |
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253 | 4 | $file = substr($file, strlen($file_root)); |
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254 | } |
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255 | |||
256 | 54 | return "(Closure {$file}:{$line})"; |
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257 | } |
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258 | if (is_object($callable)) { |
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259 | return "(" . get_class($callable) . ")->__invoke()"; |
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260 | } |
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261 | return print_r($callable, true); |
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262 | } |
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263 | |||
264 | /** |
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265 | * Get a string that uniquely identifies a callback across requests (for caching) |
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266 | * |
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267 | * @param callable $callable Callable |
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268 | * |
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269 | * @return string Empty if cannot uniquely identify this callable |
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270 | */ |
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271 | public function fingerprintCallable($callable) { |
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272 | if (is_string($callable)) { |
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273 | return $callable; |
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274 | } |
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275 | if (is_array($callable)) { |
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276 | if (is_string($callable[0])) { |
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277 | return "{$callable[0]}::{$callable[1]}"; |
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278 | } |
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279 | return get_class($callable[0]) . "::{$callable[1]}"; |
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280 | } |
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281 | if ($callable instanceof \Closure) { |
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282 | return ''; |
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283 | } |
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284 | if (is_object($callable)) { |
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285 | return get_class($callable) . "::__invoke"; |
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286 | } |
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287 | // this should not happen |
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288 | return ''; |
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289 | } |
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290 | } |
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291 |