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<?php /* * This file is part of the Symfony package. * * (c) Fabien Potencier <fabien@symfony.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ namespace Symfony\Component\ExpressionLanguage; /** * Represents a token stream. * * @author Fabien Potencier <fabien@symfony.com> */ class TokenStream { public $current; private $tokens; private $position = 0; private $expression; public function __construct(array $tokens, string $expression = '') { $this->tokens = $tokens; $this->current = $tokens[0]; $this->expression = $expression; } /** * Returns a string representation of the token stream. * * @return string */ public function __toString() { return implode("\n", $this->tokens); } /** * Sets the pointer to the next token and returns the old one. */ public function next() { ++$this->position; if (!isset($this->tokens[$this->position])) { throw new SyntaxError('Unexpected end of expression', $this->current->cursor, $this->expression); } $this->current = $this->tokens[$this->position]; } /** * Tests a token. * * @param array|int $type The type to test * @param string|null $value The token value * @param string|null $message The syntax error message */ public function expect($type, $value = null, $message = null) { $token = $this->current; if (!$token->test($type, $value)) { throw new SyntaxError(sprintf('%sUnexpected token "%s" of value "%s" ("%s" expected%s)', $message ? $message.'. ' : '', $token->type, $token->value, $type, $value ? sprintf(' with value "%s"', $value) : ''), $token->cursor, $this->expression); } $this->next(); } /** * Checks if end of stream was reached. * * @return bool */ public function isEOF() { return Token::EOF_TYPE === $this->current->type; } /** * @internal * * @return string */ public function getExpression() { return $this->expression; } }
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