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<?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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* @package twig
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class Twig_TokenStream
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{
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protected $tokens;
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protected $current;
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protected $filename;
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/**
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* Constructor.
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*
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* @param array $tokens An array of tokens
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* @param string $filename The name of the filename which tokens are associated with
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*/
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public function __construct(array $tokens, $filename = null)
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{
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$this->tokens = $tokens;
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$this->current = 0;
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$this->filename = $filename;
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}
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/**
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* Returns a string representation of the token stream.
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*
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* @return string
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*/
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public function __toString()
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{
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return implode("\n", $this->tokens);
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}
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/**
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* Sets the pointer to the next token and returns the old one.
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*
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* @return Twig_Token
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*/
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public function next()
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{
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if (!isset($this->tokens[++$this->current])) {
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throw new Twig_Error_Syntax('Unexpected end of template', -1, $this->filename);
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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 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(), $line), $token->getValue(),
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Twig_Token::typeToEnglish($type, $line), $value ? sprintf(' with value "%s"', $value) : ''),
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$line,
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$this->filename
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);
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}
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$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 integer $number
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*
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* @return Twig_Token
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*/
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public function look($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', -1, $this->filename);
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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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* Gets the current token
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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 filename associated with this stream
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*
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* @return string
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*/
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public function getFilename()
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{
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return $this->filename;
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}
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}
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