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<?php |
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namespace Digia\GraphQL\Language\Reader; |
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use Digia\GraphQL\Error\SyntaxErrorException; |
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use Digia\GraphQL\Language\Token; |
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use Digia\GraphQL\Language\TokenKindEnum; |
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use function Digia\GraphQL\Language\charCodeAt; |
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use function Digia\GraphQL\Language\printCharCode; |
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use function Digia\GraphQL\Language\sliceString; |
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use function Digia\GraphQL\Language\uniCharCode; |
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/** |
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* Class StringReader |
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* |
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* @package Digia\GraphQL\Language\Reader |
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* Reads a string token from the source file. |
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* "([^"\\\u000A\u000D]|(\\(u[0-9a-fA-F]{4}|["\\/bfnrt])))*" |
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*/ |
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class StringReader extends AbstractReader |
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{ |
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/** |
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* @inheritdoc |
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*/ |
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public function read(int $code, int $pos, int $line, int $col, Token $prev): Token |
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{ |
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$body = $this->lexer->getBody(); |
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$bodyLength = mb_strlen($body); |
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$start = $pos; |
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$pos = $start + 1; |
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$chunkStart = $pos; |
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$value = ''; |
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while ($pos < $bodyLength && ($code = charCodeAt($body, $pos)) !== null && !$this->isLineTerminator($code)) { |
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// Closing Quote (") |
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if ($code === 34) { |
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$value .= sliceString($body, $chunkStart, $pos); |
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return new Token(TokenKindEnum::STRING, $start, $pos + 1, $line, $col, $prev, $value); |
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} |
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if ($this->isSourceCharacter($code)) { |
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throw new SyntaxErrorException( |
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$this->lexer->getSource(), |
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$pos, |
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sprintf('Invalid character within String: %s', printCharCode($code)) |
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); |
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} |
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++$pos; |
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if ($code === 92) { |
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// \ |
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$value .= sliceString($body, $chunkStart, $pos + 1); |
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$code = charCodeAt($body, $pos); |
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switch ($code) { |
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case 34: |
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$value .= '"'; |
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break; |
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case 47: |
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$value .= '/'; |
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break; |
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case 92: |
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$value .= '\\'; |
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break; |
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case 98: |
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$value .= '\b'; |
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break; |
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case 102: |
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$value .= '\f'; |
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break; |
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case 110: |
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$value .= '\n'; |
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break; |
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case 114: |
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$value .= '\r'; |
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break; |
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case 116: |
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$value .= '\t'; |
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break; |
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case 117: |
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// u |
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$charCode = uniCharCode( |
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charCodeAt($body, $pos + 1), |
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charCodeAt($body, $pos + 2), |
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charCodeAt($body, $pos + 3), |
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charCodeAt($body, $pos + 4) |
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); |
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if ($charCode < 0) { |
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throw new SyntaxErrorException( |
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$this->lexer->getSource(), |
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$pos, |
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sprintf( |
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'Invalid character escape sequence: \\u%s', |
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sliceString($body, $pos + 1, $pos + 5) |
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) |
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); |
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} |
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$value .= chr($charCode); |
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$pos += 4; |
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break; |
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default: |
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throw new SyntaxErrorException( |
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$this->lexer->getSource(), |
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$pos, |
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sprintf('Invalid character escape sequence: \\%s', chr($code)) |
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); |
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} |
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++$pos; |
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$chunkStart = $pos; |
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} |
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} |
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117
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throw new SyntaxErrorException($this->lexer->getSource(), $pos, 'Unterminated string.'); |
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} |
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/** |
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* @inheritdoc |
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*/ |
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public function supportsReader(int $code, int $pos): bool |
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{ |
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$body = $this->lexer->getBody(); |
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return $code === 34 && charCodeAt($body, $pos + 1) !== 34; |
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} |
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/** |
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* @param int $code |
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* @return bool |
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*/ |
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protected function isLineTerminator(int $code): bool |
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{ |
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return $code === 0x000a || $code === 0x000d; |
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} |
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/** |
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* @param int $code |
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141
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* @return bool |
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*/ |
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protected function isSourceCharacter(int $code): bool |
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{ |
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return $code < 0x0020 && $code !== 0x0009; |
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} |
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} |
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digiaonline /
graphql-php
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