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<?php |
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/** |
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* DeferredCallChain |
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* |
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* @package php-deferred-callchain |
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* @author Jean Claveau |
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*/ |
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namespace JClaveau\Async; |
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/** |
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*/ |
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class DeferredCallChain implements \JsonSerializable, \ArrayAccess |
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{ |
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/** @var */ |
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protected $stack = []; |
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/** |
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*/ |
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public static function new_() |
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{ |
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return new static; |
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} |
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/** |
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* ArrayAccess interface |
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*/ |
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public function &offsetGet($key) |
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{ |
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$this->stack[] = [ |
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'entry' => $key, |
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]; |
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return $this; |
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} |
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/** |
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* @param string $method |
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* @param array $arguments |
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* |
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* @return $this |
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*/ |
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public final function __call($method, array $arguments) |
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{ |
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$this->stack[] = [ |
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'method' => $method, |
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'arguments' => $arguments, |
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]; |
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return $this; |
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} |
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/** |
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* For implementing JsonSerializable interface. |
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* |
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* @see https://secure.php.net/manual/en/jsonserializable.jsonserialize.php |
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*/ |
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public function jsonSerialize() |
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{ |
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return $this->stack; |
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} |
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/** |
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*/ |
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public function __toString() |
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{ |
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$string = '(new ' . get_called_class() . ')'; |
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foreach ($this->stack as $i => $call) { |
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if (isset($call['method'])) { |
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$string .= '->'; |
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$string .= $call['method'].'('; |
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$string .= implode(', ', array_map(function($argument) { |
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return var_export($argument, true); |
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}, $call['arguments'])); |
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$string .= ')'; |
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} |
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else { |
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$string .= '[' . var_export($call['entry'], true) . ']'; |
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} |
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} |
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return $string; |
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} |
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/** |
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* Invoking the instance produces the call of the stack |
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*/ |
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public function __invoke($target) |
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{ |
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$out = $target; |
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foreach ($this->stack as $i => $call) { |
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try { |
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if (isset($call['method'])) { |
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$out = call_user_func_array([$out, $call['method']], $call['arguments']); |
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} |
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else { |
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$out = $out[ $call['entry'] ]; |
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} |
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} |
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catch (\Exception $e) { |
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// Throw $e with the good stack (usage exception) |
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throw $e; |
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} |
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} |
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return $out; |
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} |
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/** |
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* ArrayAccess interface |
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*/ |
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public function offsetSet($offset, $value) |
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{ |
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throw new \BadMethodCallException( |
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"not implemented" |
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); |
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} |
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/** |
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* ArrayAccess interface |
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*/ |
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public function offsetExists($offset) |
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{ |
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throw new \BadMethodCallException( |
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"not implemented" |
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); |
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} |
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/** |
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* ArrayAccess interface |
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*/ |
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public function offsetUnset($offset) |
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{ |
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throw new \BadMethodCallException( |
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"not implemented" |
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); |
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} |
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/**/ |
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} |
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jclaveau /
php-deferred-callchain
