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<?php |
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declare(strict_types=1); |
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namespace Overblog\GraphQLBundle\ExpressionLanguage; |
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use Symfony\Component\ExpressionLanguage\Expression; |
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use Symfony\Component\ExpressionLanguage\ExpressionLanguage as BaseExpressionLanguage; |
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use Symfony\Component\ExpressionLanguage\Lexer; |
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use Symfony\Component\ExpressionLanguage\SyntaxError; |
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use Symfony\Component\ExpressionLanguage\Token; |
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use function array_merge; |
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use function strlen; |
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use function strpos; |
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use function substr; |
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class ExpressionLanguage extends BaseExpressionLanguage |
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{ |
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// TODO (murtukov): make names conditional |
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public const KNOWN_NAMES = ['value', 'args', 'context', 'info', 'object', 'validator', 'errors', 'childrenComplexity', 'typeName', 'fieldName']; |
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public const EXPRESSION_TRIGGER = '@='; |
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public array $globalNames = []; |
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public function addGlobalName(string $index, string $name): void |
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{ |
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$this->globalNames[$index] = $name; |
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} |
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public function getGlobalNames(): array |
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{ |
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return array_values($this->globalNames); |
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} |
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/** |
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* @param string|Expression $expression |
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* |
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* @return string |
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*/ |
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public function compile($expression, array $names = []) |
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{ |
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return parent::compile($expression, array_merge($names, $this->globalNames)); |
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} |
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/** |
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* Checks if expression string containst specific variable. |
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* |
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* Argument can be either an Expression object or a string with or |
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* without a prefix |
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* |
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* @param string $name - name of the searched variable (needle) |
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* @param string|Expression $expression - expression to search in (haystack) |
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* |
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* @throws SyntaxError |
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*/ |
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public static function expressionContainsVar(string $name, $expression): bool |
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{ |
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foreach (static::extractExpressionVarNames($expression) as $varName) { |
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if ($name === $varName) { |
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return true; |
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} |
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} |
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return false; |
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} |
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/** |
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* @param string|Expression $expression - expression to search in (haystack) |
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* |
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* @throws SyntaxError |
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*/ |
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public static function extractExpressionVarNames($expression): iterable |
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{ |
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if ($expression instanceof Expression) { |
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$expression = $expression->__toString(); |
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} elseif (self::stringHasTrigger($expression)) { |
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$expression = self::unprefixExpression($expression); |
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} |
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/** @var string $expression */ |
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$stream = (new Lexer())->tokenize($expression); |
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$current = &$stream->current; |
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$isProperty = false; |
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$varNames = []; |
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while (!$stream->isEOF()) { |
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if ('.' === $current->value) { |
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$isProperty = true; |
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} elseif (Token::NAME_TYPE === $current->type) { |
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if (!$isProperty) { |
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$name = $current->value; |
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// Also check that it's not a function's name |
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$stream->next(); |
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if ('(' !== $current->value) { |
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$varNames[] = $name; |
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} |
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continue; |
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} else { |
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$isProperty = false; |
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} |
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} |
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$stream->next(); |
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} |
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return $varNames; |
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} |
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/** |
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* Checks if value is a string and has the expression trigger prefix. |
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* |
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* @param mixed $value |
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*/ |
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public static function isStringWithTrigger($value): bool |
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{ |
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if (is_string($value)) { |
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return self::stringHasTrigger($value); |
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} |
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return false; |
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} |
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/** |
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* Checks if a string has the expression trigger prefix. |
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*/ |
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public static function stringHasTrigger(string $maybeExpression): bool |
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{ |
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return 0 === strpos($maybeExpression, self::EXPRESSION_TRIGGER); |
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} |
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/** |
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* Removes the expression trigger prefix from a string. If no prefix found, |
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* returns the initial string. |
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* |
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* @param string $expression - String expression with a trigger prefix |
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* |
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* @return string |
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*/ |
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public static function unprefixExpression(string $expression) |
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{ |
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$string = substr($expression, strlen(self::EXPRESSION_TRIGGER)); |
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return '' !== $string ? $string : $expression; |
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} |
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} |
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overblog /
GraphQLBundle
