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<?php |
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|
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/* |
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* This file is part of Twig. |
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* |
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* (c) Fabien Potencier |
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* (c) Armin Ronacher |
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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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namespace ElementorDeps\Twig; |
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|
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use ElementorDeps\Twig\Error\SyntaxError; |
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/** |
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* Represents a token stream. |
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* |
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* @author Fabien Potencier <fabien@symfony.com> |
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*/ |
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final class TokenStream |
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{ |
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private $tokens; |
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private $current = 0; |
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private $source; |
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public function __construct(array $tokens, ?Source $source = null) |
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{ |
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$this->tokens = $tokens; |
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$this->source = $source ?: new Source('', ''); |
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} |
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public function __toString() |
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{ |
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return \implode("\n", $this->tokens); |
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} |
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public function injectTokens(array $tokens) |
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{ |
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$this->tokens = \array_merge(\array_slice($this->tokens, 0, $this->current), $tokens, \array_slice($this->tokens, $this->current)); |
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} |
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/** |
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* Sets the pointer to the next token and returns the old one. |
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*/ |
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public function next() : Token |
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{ |
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if (!isset($this->tokens[++$this->current])) { |
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throw new SyntaxError('Unexpected end of template.', $this->tokens[$this->current - 1]->getLine(), $this->source); |
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} |
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return $this->tokens[$this->current - 1]; |
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} |
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/** |
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* Tests a token, sets the pointer to the next one and returns it or throws a syntax error. |
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* |
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* @return Token|null The next token if the condition is true, null otherwise |
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*/ |
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public function nextIf($primary, $secondary = null) |
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{ |
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return $this->tokens[$this->current]->test($primary, $secondary) ? $this->next() : null; |
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} |
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/** |
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* Tests a token and returns it or throws a syntax error. |
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*/ |
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public function expect($type, $value = null, ?string $message = null) : Token |
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{ |
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$token = $this->tokens[$this->current]; |
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if (!$token->test($type, $value)) { |
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$line = $token->getLine(); |
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throw new SyntaxError(\sprintf('%sUnexpected token "%s"%s ("%s" expected%s).', $message ? $message . '. ' : '', Token::typeToEnglish($token->getType()), $token->getValue() ? \sprintf(' of value "%s"', $token->getValue()) : '', Token::typeToEnglish($type), $value ? \sprintf(' with value "%s"', $value) : ''), $line, $this->source); |
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} |
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$this->next(); |
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return $token; |
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} |
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/** |
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* Looks at the next token. |
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*/ |
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public function look(int $number = 1) : Token |
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{ |
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if (!isset($this->tokens[$this->current + $number])) { |
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throw new SyntaxError('Unexpected end of template.', $this->tokens[$this->current + $number - 1]->getLine(), $this->source); |
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} |
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return $this->tokens[$this->current + $number]; |
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} |
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/** |
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* Tests the current token. |
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*/ |
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public function test($primary, $secondary = null) : bool |
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{ |
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return $this->tokens[$this->current]->test($primary, $secondary); |
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} |
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/** |
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* Checks if end of stream was reached. |
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*/ |
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public function isEOF() : bool |
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{ |
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return -1 === $this->tokens[$this->current]->getType(); |
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} |
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public function getCurrent() : Token |
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{ |
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return $this->tokens[$this->current]; |
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} |
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/** |
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* Gets the source associated with this stream. |
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* |
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* @internal |
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*/ |
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public function getSourceContext() : Source |
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{ |
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return $this->source; |
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} |
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} |
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