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  1: <?php
  2: 
  3: /**
  4:  * This file is part of the Nette Framework (http://nette.org)
  5:  * Copyright (c) 2004 David Grudl (http://davidgrudl.com)
  6:  */
  7: 
  8: namespace Nette\Utils;
  9: 
 10: use Nette;
 11: 
 12: 
 13: /**
 14:  * PHP callable tools.
 15:  */
 16: class Callback
 17: {
 18: 
 19:     /**
 20:      * @param  mixed   class, object, callable
 21:      * @param  string  method
 22:      * @return \Closure
 23:      */
 24:     public static function closure($callable, $m = NULL)
 25:     {
 26:         if ($m !== NULL) {
 27:             $callable = array($callable, $m);
 28: 
 29:         } elseif (is_string($callable) && count($tmp = explode('::', $callable)) === 2) {
 30:             $callable = $tmp;
 31: 
 32:         } elseif ($callable instanceof \Closure) {
 33:             return $callable;
 34: 
 35:         } elseif (is_object($callable)) {
 36:             $callable = array($callable, '__invoke');
 37:         }
 38: 
 39:         if (PHP_VERSION_ID >= 50400) {
 40:             if (is_string($callable) && function_exists($callable)) {
 41:                 $r = new \ReflectionFunction($callable);
 42:                 return $r->getClosure();
 43: 
 44:             } elseif (is_array($callable) && method_exists($callable[0], $callable[1])) {
 45:                 $r = new \ReflectionMethod($callable[0], $callable[1]);
 46:                 return $r->getClosure($callable[0]);
 47:             }
 48:         }
 49: 
 50:         self::check($callable);
 51:         $_callable_ = $callable;
 52:         return function () use ($_callable_) {
 53:             return call_user_func_array($_callable_, func_get_args());
 54:         };
 55:     }
 56: 
 57: 
 58:     /**
 59:      * Invokes callback.
 60:      * @return mixed
 61:      */
 62:     public static function invoke($callable)
 63:     {
 64:         self::check($callable);
 65:         return call_user_func_array($callable, array_slice(func_get_args(), 1));
 66:     }
 67: 
 68: 
 69:     /**
 70:      * Invokes callback with an array of parameters.
 71:      * @return mixed
 72:      */
 73:     public static function invokeArgs($callable, array $args = array())
 74:     {
 75:         self::check($callable);
 76:         return call_user_func_array($callable, $args);
 77:     }
 78: 
 79: 
 80:     /**
 81:      * Invokes internal PHP function with own error handler.
 82:      * @param  string
 83:      * @return mixed
 84:      */
 85:     public static function invokeSafe($function, array $args, $onError)
 86:     {
 87:         $prev = set_error_handler(function ($severity, $message, $file, $line, $context = NULL, $stack = NULL) use ($onError, & $prev, $function) {
 88:             if ($file === '' && defined('HHVM_VERSION')) { // https://github.com/facebook/hhvm/issues/4625
 89:                 $file = $stack[1]['file'];
 90:             }
 91:             if ($file === __FILE__ && $onError(str_replace("$function(): ", '', $message), $severity) !== FALSE) {
 92:                 return;
 93:             } elseif ($prev) {
 94:                 return call_user_func_array($prev, func_get_args());
 95:             }
 96:             return FALSE;
 97:         });
 98: 
 99:         try {
100:             $res = call_user_func_array($function, $args);
101:             restore_error_handler();
102:             return $res;
103: 
104:         } catch (\Exception $e) {
105:             restore_error_handler();
106:             throw $e;
107:         }
108:     }
109: 
110: 
111:     /**
112:      * @return callable
113:      */
114:     public static function check($callable, $syntax = FALSE)
115:     {
116:         if (!is_callable($callable, $syntax)) {
117:             throw new Nette\InvalidArgumentException($syntax
118:                 ? 'Given value is not a callable type.'
119:                 : sprintf("Callback '%s' is not callable.", self::toString($callable))
120:             );
121:         }
122:         return $callable;
123:     }
124: 
125: 
126:     /**
127:      * @return string
128:      */
129:     public static function toString($callable)
130:     {
131:         if ($callable instanceof \Closure) {
132:             $inner = self::unwrap($callable);
133:             return '{closure' . ($inner instanceof \Closure ? '}' : ' ' . self::toString($inner) . '}');
134:         } elseif (is_string($callable) && $callable[0] === "\0") {
135:             return '{lambda}';
136:         } else {
137:             is_callable($callable, TRUE, $textual);
138:             return $textual;
139:         }
140:     }
141: 
142: 
143:     /**
144:      * @return \ReflectionMethod|\ReflectionFunction
145:      */
146:     public static function toReflection($callable)
147:     {
148:         if ($callable instanceof \Closure) {
149:             $callable = self::unwrap($callable);
150:         } elseif ($callable instanceof Nette\Callback) {
151:             $callable = $callable->getNative();
152:         }
153: 
154:         $class = class_exists('Nette\Reflection\Method') ? 'Nette\Reflection\Method' : 'ReflectionMethod';
155:         if (is_string($callable) && strpos($callable, '::')) {
156:             return new $class($callable);
157:         } elseif (is_array($callable)) {
158:             return new $class($callable[0], $callable[1]);
159:         } elseif (is_object($callable) && !$callable instanceof \Closure) {
160:             return new $class($callable, '__invoke');
161:         } else {
162:             $class = class_exists('Nette\Reflection\GlobalFunction') ? 'Nette\Reflection\GlobalFunction' : 'ReflectionFunction';
163:             return new $class($callable);
164:         }
165:     }
166: 
167: 
168:     /**
169:      * @return bool
170:      */
171:     public static function isStatic($callable)
172:     {
173:         return is_array($callable) ? is_string($callable[0]) : is_string($callable);
174:     }
175: 
176: 
177:     /**
178:      * Unwraps closure created by self::closure()
179:      * @internal
180:      * @return callable
181:      */
182:     public static function unwrap(\Closure $closure)
183:     {
184:         $r = new \ReflectionFunction($closure);
185:         if (substr($r->getName(), -1) === '}') {
186:             $vars = $r->getStaticVariables();
187:             return isset($vars['_callable_']) ? $vars['_callable_'] : $closure;
188: 
189:         } elseif ($obj = $r->getClosureThis()) {
190:             return array($obj, $r->getName());
191: 
192:         } elseif ($class = $r->getClosureScopeClass()) {
193:             return array($class->getName(), $r->getName());
194: 
195:         } else {
196:             return $r->getName();
197:         }
198:     }
199: 
200: }
201: 
Nette 2.3.4 API API documentation generated by ApiGen 2.8.0