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<?php declare(strict_types = 1); |
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namespace Apicart\FQL\Tokenizer; |
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use Apicart\FQL\Token\Token\GroupBegin; |
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use Apicart\FQL\Value\Token; |
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use RuntimeException; |
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abstract class AbstractTokenExtractor |
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{ |
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/** |
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* Return the token at the given $position of the $string. |
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* |
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* @throws RuntimeException On PCRE regex error |
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*/ |
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507 |
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final public function extract(string $string, int $position): Token |
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{ |
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$byteOffset = $this->getByteOffset($string, $position); |
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foreach ($this->getExpressionTypeMap() as $expression => $type) { |
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$success = preg_match($expression, $string, $matches, 0, $byteOffset); |
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if ($success === false) { |
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throw new RuntimeException('PCRE regex error code: ' . preg_last_error()); |
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} |
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if ($success === 0) { |
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continue; |
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} |
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if (isset($matches['domain'])) { |
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$matches['domain'] = trim($matches['domain'], "'"); |
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} |
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return $this->createToken($type, $position, $matches); |
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} |
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return new Token(Tokenizer::TOKEN_BAILOUT, mb_substr($string, $position, 1), $position); |
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} |
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/** |
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* Return a map of regular expressions to token types. |
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* |
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* The returned map must be an array where key is a regular expression |
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* and value is a corresponding token type. Regular expression must define |
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* named capturing group 'lexeme' that identifies part of the input string |
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* recognized as token. |
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*/ |
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abstract protected function getExpressionTypeMap(): array; |
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/** |
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* Create a term type token by the given parameters. |
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* |
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* @throw RuntimeException If token could not be created from the given $matches data |
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*/ |
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abstract protected function createTermToken(int $position, array $data): Token; |
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74 |
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/** |
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* Create an instance of Group token by the given parameters. |
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*/ |
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protected function createGroupBeginToken(int $position, array $data): GroupBegin |
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{ |
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return new GroupBegin($data['lexeme'], $position, $data['delimiter'], $data['domain']); |
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} |
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506 |
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88 |
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private function createToken(int $type, int $position, array $data): Token |
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{ |
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if ($type === Tokenizer::TOKEN_GROUP_BEGIN) { |
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return $this->createGroupBeginToken($position, $data); |
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} |
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if ($type === Tokenizer::TOKEN_TERM) { |
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return $this->createTermToken($position, $data); |
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} |
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return new Token($type, $data['lexeme'], $position); |
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} |
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/** |
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* Return the offset of the given $position in the input $string, in bytes. |
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* |
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* Offset in bytes is needed for preg_match $offset parameter. |
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*/ |
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private function getByteOffset(string $string, int $position): int |
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{ |
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return strlen(mb_substr($string, 0, $position)); |
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} |
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} |
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apicart /
fql
