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<?php |
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/** |
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* @file |
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* Grafizzi\Graph\Filter\StringFilter: a component of the Grafizzi library. |
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* |
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* (c) 2012 Frédéric G. MARAND <[email protected]> |
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* |
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* Grafizzi is free software: you can redistribute it and/or modify it under the |
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* terms of the GNU Lesser General Public License as published by the Free |
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* Software Foundation, either version 3 of the License, or (at your option) any |
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* later version. |
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* |
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* Grafizzi is distributed in the hope that it will be useful, but WITHOUT ANY |
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR |
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* A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more |
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* details. |
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* |
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* You should have received a copy of the GNU Lesser General Public License |
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* along with Grafizzi, in the COPYING.LESSER.txt file. If not, see |
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* <http://www.gnu.org/licenses/> |
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*/ |
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namespace Grafizzi\Graph\Filter; |
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/** |
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* A Grafizzi filter that also outputs its result to the passed-in string. |
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* |
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* Since it has to be passed by reference, the argument to use is like: |
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* array('out' => &$some_string). |
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*/ |
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class StringFilter extends AbstractFilter implements FilterInterface { |
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/** |
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* The reference to the variable in which to copy the result. |
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* |
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* @var string |
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*/ |
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public $string = null; |
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/** |
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* An optional callable to be invoked on the data. |
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* |
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* @var callable |
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* It receives the input and returns its after filtering. |
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*/ |
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public $callback = null; |
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/** |
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* @param array $args |
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* $args[0] is the only used element in this array. |
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* @throws \InvalidArgumentException |
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*/ |
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public function __construct(array $args = array()) { |
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if (isset($args['out'])) { |
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$this->string = &$args['out']; |
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} |
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if (isset($args['callback'])) { |
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if (is_callable($args['callback'])) { |
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$this->callback = $args['callback']; |
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} |
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else { |
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throw new \InvalidArgumentException("Invalid callback passed to " . __CLASS__); |
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} |
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} |
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3 |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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3 |
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public function filter($input) { |
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/** @var string $stdout */ |
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$stdout = isset($this->callback) |
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? call_user_func($this->callback, $input) |
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: $input; |
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if (isset($this->string)) { |
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$this->string = $stdout; |
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} |
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$ret = array($stdout, null); |
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return $ret; |
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} |
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} |
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FGM /
grafizzi
