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<?php |
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/** |
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* @package s9e\RegexpBuilder |
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* @copyright Copyright (c) 2016 The s9e Authors |
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License |
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*/ |
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namespace s9e\RegexpBuilder\Passes; |
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/** |
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* Replaces (?:aax|bbx) with (?:aa|bb)x |
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*/ |
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class MergeSuffix extends AbstractPass |
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{ |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function canRun(array $strings) |
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{ |
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return (count($strings) > 1 && $this->hasMatchingSuffix($strings)); |
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} |
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/** |
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* {@inheritdoc} |
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*/ |
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protected function runPass(array $strings) |
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{ |
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$newString = []; |
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while ($this->hasMatchingSuffix($strings)) |
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{ |
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array_unshift($newString, end($strings[0])); |
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$strings = $this->pop($strings); |
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} |
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array_unshift($newString, $strings); |
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return [$newString]; |
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} |
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/** |
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* Test whether all given strings have the same last element |
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* |
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* @param array[] $strings |
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* @return bool |
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*/ |
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protected function hasMatchingSuffix(array $strings) |
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{ |
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$suffix = end($strings[1]); |
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foreach ($strings as $string) |
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{ |
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if (end($string) !== $suffix) |
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{ |
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return false; |
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} |
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} |
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return ($suffix !== false); |
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} |
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/** |
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* Remove the last element of every string |
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* |
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* @param array[] $strings Original strings |
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* @return array[] Processed strings |
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*/ |
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protected function pop(array $strings) |
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{ |
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$cnt = count($strings); |
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$i = $cnt; |
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while (--$i >= 0) |
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{ |
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array_pop($strings[$i]); |
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} |
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// Remove empty elements then prepend one back at the start of the array if applicable |
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$strings = array_filter($strings); |
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if (count($strings) < $cnt) |
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{ |
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array_unshift($strings, []); |
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} |
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return $strings; |
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} |
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} |
s9e /
RegexpBuilder
