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<?php |
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/** |
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* This file is part of byrokrat\autogiro. |
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* |
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* byrokrat\autogiro is free software: you can redistribute it and/or |
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* modify it under the terms of the GNU General Public License as published |
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* by the Free Software Foundation, either version 3 of the License, or |
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* (at your option) any later version. |
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* |
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* byrokrat\autogiro is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with byrokrat\autogiro. If not, see <http://www.gnu.org/licenses/>. |
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* |
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* Copyright 2016 Hannes Forsgård |
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*/ |
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declare(strict_types = 1); |
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namespace byrokrat\autogiro; |
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use byrokrat\autogiro\Tree\Node; |
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use byrokrat\autogiro\Exception\LogicException; |
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/** |
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* Tool to enumerate tree nodes of specified types |
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*/ |
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class Enumerator |
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{ |
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/** |
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* @var callable[] |
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*/ |
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private $callbacks = []; |
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/** |
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* Magic method to register enumeration callbacks |
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* |
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* Usage: $enumerator->onNodeType($callback); |
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* |
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* @param string $name Node type to capure prefixed with on (eg onNodeType) |
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* @param array $args First argument must be a capure callback |
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* |
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* @throws LogicException If node type or callback is not specified |
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*/ |
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public function __call(string $name, array $args) |
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{ |
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if (!preg_match('/^on[a-zA-Z0-9_]+$/', $name)) { |
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throw new LogicException("Unknown method $name"); |
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} |
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if (!isset($args[0]) || !is_callable($args[0])) { |
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throw new LogicException('Enumeration callback must be callable'); |
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} |
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$this->on(substr($name, 2), $args[0]); |
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} |
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/** |
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* Register a callback for node type |
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*/ |
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public function on(string $nodeType, callable $callback) |
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{ |
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$this->callbacks[$nodeType] = $callback; |
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} |
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/** |
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* Enumerate nodes in tree |
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*/ |
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public function enumerate(Node $tree) |
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{ |
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$this->dispatch($tree); |
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foreach ($tree->getChildren() as $child) { |
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$this->enumerate($child); |
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} |
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} |
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/** |
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* Invoke callback registered with node type |
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*/ |
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private function dispatch(Node $node) |
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{ |
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if (isset($this->callbacks[$node->getType()])) { |
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$this->callbacks[$node->getType()]($node); |
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} |
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} |
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} |
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byrokrat /
autogiro
