149 lines
3.7 KiB
PHP
149 lines
3.7 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) 2009 Fabien Potencier
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* (c) 2009 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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/**
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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 Twig_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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/**
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* @param array $tokens An array of tokens
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* @param Twig_Source $source
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*/
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public function __construct(array $tokens, Twig_Source $source = null)
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{
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$this->tokens = $tokens;
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$this->source = $source ?: new Twig_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, $this->current));
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}
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/**
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* Sets the pointer to the next token and returns the old one.
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*
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* @return Twig_Token
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*/
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public function next()
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{
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if (!isset($this->tokens[++$this->current])) {
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throw new Twig_Error_Syntax('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 Twig_Token|null The next token if the condition is true, null otherwise
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*/
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public function nextIf($primary, $secondary = null)
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{
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if ($this->tokens[$this->current]->test($primary, $secondary)) {
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return $this->next();
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}
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}
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/**
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* Tests a token and returns it or throws a syntax error.
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*
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* @return Twig_Token
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*/
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public function expect($type, $value = null, $message = null)
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{
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$token = $this->tokens[$this->current];
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if (!$token->test($type, $value)) {
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$line = $token->getLine();
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throw new Twig_Error_Syntax(sprintf('%sUnexpected token "%s" of value "%s" ("%s" expected%s).',
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$message ? $message.'. ' : '',
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Twig_Token::typeToEnglish($token->getType()), $token->getValue(),
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Twig_Token::typeToEnglish($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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* @param int $number
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*
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* @return Twig_Token
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*/
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public function look($number = 1)
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{
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if (!isset($this->tokens[$this->current + $number])) {
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throw new Twig_Error_Syntax('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 + $number];
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}
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/**
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* Tests the current token.
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*
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* @return bool
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*/
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public function test($primary, $secondary = null)
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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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* @return bool
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*/
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public function isEOF()
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{
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return $this->tokens[$this->current]->getType() === Twig_Token::EOF_TYPE;
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}
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/**
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* @return Twig_Token
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*/
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public function getCurrent()
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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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* @return Twig_Source
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*
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* @internal
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*/
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public function getSourceContext()
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{
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return $this->source;
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}
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}
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