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<?php declare(strict_types=1); |
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/** |
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* @package s9e\RegexpBuilder |
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* @copyright Copyright (c) 2016-2022 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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abstract class AbstractPass implements PassInterface |
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{ |
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/** |
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* @var bool Whether the current set of strings is optional |
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*/ |
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protected $isOptional; |
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/** |
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* {@inheritdoc} |
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*/ |
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public function run(array $strings): array |
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{ |
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$strings = $this->beforeRun($strings); |
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if ($this->canRun($strings)) |
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{ |
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$strings = $this->runPass($strings); |
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} |
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$strings = $this->afterRun($strings); |
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return $strings; |
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} |
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/** |
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* Process the list of strings after the pass is run |
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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 afterRun(array $strings): array |
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{ |
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if ($this->isOptional && $strings[0] !== []) |
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{ |
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array_unshift($strings, []); |
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} |
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return $strings; |
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} |
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/** |
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* Prepare the list of strings before the pass is run |
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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 beforeRun(array $strings): array |
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{ |
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$this->isOptional = (isset($strings[0]) && $strings[0] === []); |
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if ($this->isOptional) |
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{ |
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array_shift($strings); |
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} |
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return $strings; |
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} |
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/** |
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* Test whether this pass can be run on a given list of strings |
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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 canRun(array $strings): bool |
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{ |
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return true; |
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} |
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/** |
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* Run this pass on a list of strings |
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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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abstract protected function runPass(array $strings): array; |
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/** |
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* Test whether given string has an optional suffix |
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* |
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* @param array $string |
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* @return bool |
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*/ |
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protected function hasOptionalSuffix(array $string): bool |
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{ |
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$suffix = end($string); |
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return (is_array($suffix) && $suffix[0] === []); |
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} |
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/** |
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* Test whether given string contains a single alternation made of single values |
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* |
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* @param array $string |
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* @return bool |
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*/ |
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protected function isCharacterClassString(array $string): bool |
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{ |
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return ($this->isSingleAlternationString($string) && $this->isSingleCharStringList($string[0])); |
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} |
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/** |
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* Test whether given string contains one single element that is an alternation |
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* |
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* @param array $string |
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* @return bool |
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*/ |
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protected function isSingleAlternationString(array $string): bool |
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{ |
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return (count($string) === 1 && is_array($string[0])); |
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} |
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/** |
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* Test whether given string contains a single character value |
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* |
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* @param array $string |
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* @return bool |
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*/ |
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protected function isSingleCharString(array $string): bool |
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{ |
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return (count($string) === 1 && !is_array($string[0])); |
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} |
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/** |
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* Test whether given list of strings contains nothing but single-char strings |
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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 isSingleCharStringList(array $strings): bool |
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{ |
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foreach ($strings as $string) |
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{ |
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if (!$this->isSingleCharString($string)) |
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{ |
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return false; |
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} |
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} |
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1 |
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return true; |
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} |
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} |
s9e /
RegexpBuilder
