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<?php |
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/** |
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* This file is part of Railt package. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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declare(strict_types=1); |
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namespace Railt\SDL\Frontend\AST\Value; |
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use Railt\Parser\Ast\LeafInterface; |
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/** |
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* Class StringValue |
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*/ |
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class StringValueNode extends AbstractAstValueNode |
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{ |
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/** |
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* @var string |
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*/ |
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private const UTF_SEQUENCE_PATTERN = '/(?<!\\\\)\\\\u([0-9a-f]{4})/ui'; |
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/** |
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* @var string |
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*/ |
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private const CHAR_SEQUENCE_PATTERN = '/(?<!\\\\)\\\\(b|f|n|r|t)/u'; |
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/** |
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* @return string |
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*/ |
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private function getStringValue(): string |
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{ |
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/** @var LeafInterface $leaf */ |
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$leaf = $this->getChild(0); |
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return $leaf->getValue(1); |
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} |
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/** |
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* @return string |
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*/ |
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public function parse(): string |
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{ |
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// "..." |
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$result = $this->getStringValue(); |
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// Encode slashes to special "pattern" chars |
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$result = $this->encodeSlashes($result); |
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// Transform utf char \uXXXX -> X |
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$result = $this->renderUtfSequences($result); |
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// Transform special chars |
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$result = $this->renderSpecialCharacters($result); |
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// Decode special patterns to source chars (rollback) |
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$result = $this->decodeSlashes($result); |
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return $result; |
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} |
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/** |
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* @param string $value |
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* @return string |
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*/ |
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private function encodeSlashes(string $value): string |
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{ |
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return \str_replace(['\\\\', '\\"'], ["\0", '"'], $value); |
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} |
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/** |
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* Method for parsing and decode utf-8 character |
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* sequences like "\uXXXX" type. |
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* |
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* @see http://facebook.github.io/graphql/October2016/#sec-String-Value |
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* @param string $body |
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* @return string |
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*/ |
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private function renderUtfSequences(string $body): string |
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{ |
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$callee = function (array $matches): string { |
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[$char, $code] = [$matches[0], $matches[1]]; |
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try { |
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return $this->forwardRenderUtfSequences($code); |
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} catch (\Error | \ErrorException $error) { |
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return $this->fallbackRenderUtfSequences($char); |
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} |
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}; |
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return @\preg_replace_callback(self::UTF_SEQUENCE_PATTERN, $callee, $body) ?? $body; |
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} |
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/** |
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* @param string $body |
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* @return string |
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*/ |
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private function forwardRenderUtfSequences(string $body): string |
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{ |
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return \mb_convert_encoding(\pack('H*', $body), 'UTF-8', 'UCS-2BE'); |
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} |
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/** |
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* @param string $body |
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* @return string |
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*/ |
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private function fallbackRenderUtfSequences(string $body): string |
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{ |
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try { |
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if (\function_exists('\\json_decode')) { |
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$result = @\json_decode('{"char": "' . $body . '"}')->char; |
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if (\json_last_error() === \JSON_ERROR_NONE) { |
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$body = $result; |
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} |
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} |
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} finally { |
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return $body; |
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} |
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} |
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/** |
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* Method for parsing special control characters. |
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* |
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* @see http://facebook.github.io/graphql/October2016/#sec-String-Value |
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* @param string $body |
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* @return string |
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*/ |
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private function renderSpecialCharacters(string $body): string |
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{ |
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$callee = function (array $matches): string { |
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[$char, $code] = [$matches[0], $matches[1]]; |
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switch ($code) { |
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case 'b': |
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return "\u{0008}"; |
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case 'f': |
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return "\u{000C}"; |
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case 'n': |
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return "\u{000A}"; |
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case 'r': |
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return "\u{000D}"; |
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case 't': |
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return "\u{0009}"; |
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} |
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return $char; |
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}; |
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return @\preg_replace_callback(self::CHAR_SEQUENCE_PATTERN, $callee, $body) ?? $body; |
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} |
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/** |
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* @param string $value |
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* @return string |
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*/ |
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private function decodeSlashes(string $value): string |
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{ |
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return \str_replace("\0", '\\', $value); |
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} |
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} |
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railt /
sdl
Loading history...
This check marks access to variables or properties that have not been declared yet. While PHP has no explicit notion of declaring a variable, accessing it before a value is assigned to it is most likely a bug.