131 lines
3.4 KiB
PHP
131 lines
3.4 KiB
PHP
<?php
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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 Twig;
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use 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 = $token->getLine();
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throw new SyntaxError(\sprintf('%sUnexpected token "%s"%s ("%s" expected%s).',
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$message ? $message.'. ' : '',
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Token::typeToEnglish($token->getType()),
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$token->getValue() ? \sprintf(' of value "%s"', $token->getValue()) : '',
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Token::typeToEnglish($type), $value ? \sprintf(' with value "%s"', $value) : ''),
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$line,
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$this->source
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);
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}
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$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 /* Token::EOF_TYPE */ -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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