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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 (?:ab|bb|c) with (?:[ab]b|c) |
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*/ |
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class CoalesceSingleCharacterPrefix 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 runPass(array $strings) |
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{ |
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$newStrings = []; |
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foreach ($this->getEligibleKeys($strings) as $keys) |
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{ |
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// Create a new string to hold the merged strings and replace the first element with |
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// an empty character class |
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$newString = $strings[$keys[0]]; |
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$newString[0] = []; |
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foreach ($keys as $key) |
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{ |
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$newString[0][] = [$strings[$key][0]]; |
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unset($strings[$key]); |
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} |
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$newStrings[] = $newString; |
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} |
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return array_merge($newStrings, $strings); |
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} |
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/** |
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* Filter the list of eligible keys and keep those that have at least two matches |
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* |
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* @param array[] $eligibleKeys List of lists of keys |
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* @return array[] |
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*/ |
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protected function filterEligibleKeys(array $eligibleKeys) |
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{ |
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$filteredKeys = []; |
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foreach ($eligibleKeys as $k => $keys) |
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{ |
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if (count($keys) > 1) |
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{ |
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$filteredKeys[] = $keys; |
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} |
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} |
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return $filteredKeys; |
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} |
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/** |
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* Get a list of keys of strings eligible to be merged together, grouped by suffix |
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* |
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* @param array[] $strings |
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* @return array[] |
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*/ |
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protected function getEligibleKeys(array $strings) |
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{ |
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$eligibleKeys = []; |
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foreach ($strings as $k => $string) |
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{ |
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if (!is_array($string[0]) && isset($string[1])) |
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{ |
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$suffix = serialize(array_slice($string, 1)); |
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$eligibleKeys[$suffix][] = $k; |
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} |
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} |
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return $this->filterEligibleKeys($eligibleKeys); |
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} |
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} |
s9e /
RegexpBuilder
