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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2019 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\TextFormatter\Configurator; |
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use RuntimeException; |
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use s9e\TextFormatter\Configurator\RecursiveParser\MatcherInterface; |
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class RecursiveParser |
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{ |
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/** |
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* @var array Callback associated with each match name |
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*/ |
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protected $callbacks = []; |
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/** |
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* @var array Groups associated with each match name |
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*/ |
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protected $matchGroups = []; |
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/** |
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* @var string Regexp used to match input |
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*/ |
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protected $regexp; |
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/** |
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* Parse given string |
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* |
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* @param string $str |
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* @param string $restrict Pipe-separated list of allowed matches (ignored if empty) |
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* @return mixed |
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*/ |
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public function parse(string $str, string $restrict = '') |
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{ |
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$regexp = $this->regexp; |
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if ($restrict !== '') |
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{ |
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// Restrict matches to given list and numbered arguments |
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$regexp = preg_replace('(\\(\\?<(?!(?:' . $restrict . '|\\w+\\d+)>))', '(*FAIL)$0', $regexp); |
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} |
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preg_match($regexp, $str, $m); |
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if (!isset($m['MARK'])) |
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{ |
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throw new RuntimeException('Cannot parse ' . var_export($str, true)); |
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} |
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$name = $m['MARK']; |
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$args = $this->getArguments($m, $name); |
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return [ |
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'groups' => $this->matchGroups[$name] ?? [], |
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'match' => $name, |
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'value' => call_user_func_array($this->callbacks[$name], $args) |
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]; |
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} |
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/** |
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* Set the list of matchers used by this parser |
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* |
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* @param MatcherInterface[] |
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* @return void |
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*/ |
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public function setMatchers(array $matchers): void |
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{ |
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$groupMatches = []; |
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$this->matchGroups = []; |
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$this->regexp = '(^(?:'; |
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foreach ($this->getMatchersConfig($matchers) as $matchName => $matchConfig) |
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{ |
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foreach ($matchConfig['groups'] as $group) |
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{ |
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$groupMatches[$group][] = $matchName; |
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} |
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$regexp = $matchConfig['regexp']; |
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$regexp = $this->insertCaptureNames($matchName , $regexp); |
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$regexp = str_replace(' ', '\\s*', $regexp); |
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$regexp = '(?<' . $matchName . '>' . $regexp . '(*:' . $matchName . '))'; |
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$this->regexp .= $regexp . '|'; |
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$this->callbacks[$matchName] = $matchConfig['callback']; |
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$this->matchGroups[$matchName] = $matchConfig['groups']; |
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} |
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foreach ($groupMatches as $group => $names) |
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{ |
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$this->regexp .= '(?<' . $group . '>(?&' . implode(')|(?&', $names) . '))|'; |
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} |
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$this->regexp = substr($this->regexp, 0, -1) . ')$)s'; |
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} |
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/** |
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* Get the list of arguments produced by a regexp's match |
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* |
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* @param string[] $matches Regexp matches |
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* @param string $name Regexp name |
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* @return string[] |
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*/ |
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protected function getArguments(array $matches, string $name): array |
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{ |
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$args = []; |
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$i = 0; |
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while (isset($matches[$name . $i])) |
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{ |
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$args[] = $matches[$name . $i]; |
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++$i; |
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} |
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return $args; |
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} |
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/** |
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* Collect, normalize, sort and return the config for all matchers |
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* |
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* @param MatcherInterface[] $matchers |
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* @return array |
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*/ |
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protected function getMatchersConfig(array $matchers): array |
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{ |
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$matchersConfig = []; |
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foreach ($matchers as $matcher) |
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{ |
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foreach ($matcher->getMatchers() as $matchName => $matchConfig) |
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{ |
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if (is_string($matchConfig)) |
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{ |
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$matchConfig = ['regexp' => $matchConfig]; |
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} |
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$parts = explode(':', $matchName); |
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$matchName = array_pop($parts); |
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$matchConfig += [ |
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'callback' => [$matcher, 'parse' . $matchName], |
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'groups' => [], |
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'order' => 0 |
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]; |
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$matchConfig['groups'] = array_unique(array_merge($matchConfig['groups'], $parts)); |
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sort($matchConfig['groups']); |
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$matchersConfig[$matchName] = $matchConfig; |
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} |
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} |
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uasort($matchersConfig, 'static::sortMatcherConfig'); |
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return $matchersConfig; |
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} |
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/** |
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* Insert capture names into given regexp |
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* |
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* @param string $name Name of the regexp, used to name captures |
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* @param string $regexp Original regexp |
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* @return string Modified regexp |
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*/ |
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protected function insertCaptureNames(string $name, string $regexp): string |
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{ |
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$i = 0; |
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return preg_replace_callback( |
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'((?<!\\\\)\\((?!\\?))', |
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function ($m) use (&$i, $name) |
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{ |
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return '(?<' . $name . $i++ . '>'; |
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}, |
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$regexp |
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); |
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} |
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/** |
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* Compare two matchers' config |
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* |
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* @param array $a |
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* @param array $b |
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* @return integer |
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*/ |
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protected static function sortMatcherConfig(array $a, array $b): int |
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{ |
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return $a['order'] - $b['order']; |
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} |
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} |
s9e /
TextFormatter
