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<?php |
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declare(strict_types=1); |
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namespace Remorhaz\Lexer\Runtime\Token; |
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use function array_shift; |
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use function array_unshift; |
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use function count; |
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final class MatcherSelector implements MatcherSelectorInterface |
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{ |
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/** |
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* @var TokenMatcherInterface[] |
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* @psalm-var array<string,TokenMatcherInterface> |
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*/ |
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private $matchers; |
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/** |
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* @var string[] |
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* @psalm-var array<int,string> |
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*/ |
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private $matcherKeys = []; |
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/** |
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* @param TokenMatcherInterface[] $matchers |
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* @psalm-param array<string,TokenMatcherInterface> $matchers |
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* @param string $startMatcherKey |
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*/ |
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public function __construct(array $matchers, string $startMatcherKey) |
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{ |
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$this->matchers = $matchers; |
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$this->setMatcher($startMatcherKey); |
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} |
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/** |
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* @param string $matcherKey |
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* @return TokenMatcherInterface |
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* @psalm-pure |
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*/ |
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private function getMatcherByKey(string $matcherKey): TokenMatcherInterface |
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{ |
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if (isset($this->matchers[$matcherKey])) { |
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return $this->matchers[$matcherKey]; |
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} |
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throw new Exception\MatcherNotFoundException($matcherKey); |
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} |
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/** |
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* {@inheritDoc} |
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* |
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* @return TokenMatcherInterface |
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* @psalm-pure |
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*/ |
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public function getMatcher(): TokenMatcherInterface |
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{ |
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if (!isset($this->matcherKeys[0])) { |
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throw new Exception\MatcherKeyNotFoundException(); |
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} |
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return $this->getMatcherByKey($this->matcherKeys[0]); |
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} |
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/** |
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* {@inheritDoc} |
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* |
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* @param string $matcherKey |
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*/ |
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public function setMatcher(string $matcherKey): void |
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{ |
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if (!isset($this->matchers[$matcherKey])) { |
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throw new Exception\MatcherNotFoundException($matcherKey); |
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} |
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array_unshift($this->matcherKeys, $matcherKey); |
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} |
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/** |
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* {@inheritDoc} |
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*/ |
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public function restoreMatcher(): void |
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{ |
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if (count($this->matcherKeys) == 1) { |
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throw new Exception\MatcherNotRestoredException(); |
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} |
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array_shift($this->matcherKeys); |
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} |
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} |
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remorhaz /
php-lexer-runtime
