1: <?php
  2: 
  3: /**
  4:  * This file is part of the Nette Framework (https://nette.org)
  5:  * Copyright (c) 2004 David Grudl (https://davidgrudl.com)
  6:  */
  7: 
  8: namespace Nette\Utils;
  9: 
 10: use Nette;
 11: 
 12: 
 13: /**
 14:  * PHP callable tools.
 15:  *
 16:  * @author     David Grudl
 17:  */
 18: class Callback
 19: {
 20: 
 21:     /**
 22:      * @param  mixed   class, object, callable
 23:      * @param  string  method
 24:      * @return \Closure
 25:      */
 26:     public static function closure($callable, $m = NULL)
 27:     {
 28:         if ($m !== NULL) {
 29:             $callable = array($callable, $m);
 30:         } elseif ($callable instanceof \Closure) {
 31:             return $callable;
 32:         }
 33: 
 34:         self::check($callable, TRUE);
 35:         $_callable_ = $callable;
 36:         return function () use ($_callable_) {
 37:             Callback::check($_callable_);
 38:             return call_user_func_array($_callable_, func_get_args());
 39:         };
 40:     }
 41: 
 42: 
 43:     /**
 44:      * Invokes callback.
 45:      * @return mixed
 46:      */
 47:     public static function invoke($callable)
 48:     {
 49:         self::check($callable);
 50:         return call_user_func_array($callable, array_slice(func_get_args(), 1));
 51:     }
 52: 
 53: 
 54:     /**
 55:      * Invokes callback with an array of parameters.
 56:      * @return mixed
 57:      */
 58:     public static function invokeArgs($callable, array $args = array())
 59:     {
 60:         self::check($callable);
 61:         return call_user_func_array($callable, $args);
 62:     }
 63: 
 64: 
 65:     /**
 66:      * Invokes internal PHP function with own error handler.
 67:      * @return mixed
 68:      * @internal
 69:      */
 70:     public static function invokeSafe($function, array $args, $onError)
 71:     {
 72:         $prev = set_error_handler(function ($severity, $message, $file) use ($onError, & $prev) {
 73:             if ($file === __FILE__ && $onError($message, $severity) !== FALSE) {
 74:                 return;
 75:             } elseif ($prev) {
 76:                 return call_user_func_array($prev, func_get_args());
 77:             }
 78:             return FALSE;
 79:         });
 80: 
 81:         try {
 82:             $res = call_user_func_array($function, $args);
 83:             restore_error_handler();
 84:             return $res;
 85: 
 86:         } catch (\Exception $e) {
 87:             restore_error_handler();
 88:             throw $e;
 89:         }
 90:     }
 91: 
 92: 
 93:     /**
 94:      * @return callable
 95:      */
 96:     public static function check($callable, $syntax = FALSE)
 97:     {
 98:         if (!is_callable($callable, $syntax)) {
 99:             throw new Nette\InvalidArgumentException($syntax
100:                 ? 'Given value is not a callable type.'
101:                 : sprintf("Callback '%s' is not callable.", self::toString($callable))
102:             );
103:         }
104:         return $callable;
105:     }
106: 
107: 
108:     /**
109:      * @return string
110:      */
111:     public static function toString($callable)
112:     {
113:         if ($callable instanceof \Closure) {
114:             if ($inner = self::unwrap($callable)) {
115:                 return '{closure ' . self::toString($inner) . '}';
116:             }
117:             return '{closure}';
118:         } elseif (is_string($callable) && $callable[0] === "\0") {
119:             return '{lambda}';
120:         } else {
121:             is_callable($callable, TRUE, $textual);
122:             return $textual;
123:         }
124:     }
125: 
126: 
127:     /**
128:      * @return Nette\Reflection\GlobalFunction|Nette\Reflection\Method
129:      */
130:     public static function toReflection($callable)
131:     {
132:         if ($callable instanceof \Closure && $inner = self::unwrap($callable)) {
133:             $callable = $inner;
134:         } elseif ($callable instanceof Nette\Callback) {
135:             $callable = $callable->getNative();
136:         }
137: 
138:         if (is_string($callable) && strpos($callable, '::')) {
139:             return new Nette\Reflection\Method($callable);
140:         } elseif (is_array($callable)) {
141:             return new Nette\Reflection\Method($callable[0], $callable[1]);
142:         } elseif (is_object($callable) && !$callable instanceof \Closure) {
143:             return new Nette\Reflection\Method($callable, '__invoke');
144:         } else {
145:             return new Nette\Reflection\GlobalFunction($callable);
146:         }
147:     }
148: 
149: 
150:     /**
151:      * @return bool
152:      */
153:     public static function isStatic($callable)
154:     {
155:         return is_array($callable) ? is_string($callable[0]) : is_string($callable);
156:     }
157: 
158: 
159:     /**
160:      * Unwraps closure created by self::closure(), used i.e. by ObjectMixin in PHP < 5.4
161:      * @internal
162:      * @return callable
163:      */
164:     public static function unwrap(\Closure $closure)
165:     {
166:         $rm = new \ReflectionFunction($closure);
167:         $vars = $rm->getStaticVariables();
168:         return isset($vars['_callable_']) ? $vars['_callable_'] : NULL;
169:     }
170: 
171: }
172: