--- /dev/null
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) Fabien Potencier
+ * (c) Armin Ronacher
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+/**
+ * Represents a token stream.
+ *
+ * @final
+ *
+ * @author Fabien Potencier <fabien@symfony.com>
+ */
+class Twig_TokenStream
+{
+ protected $tokens;
+ protected $current = 0;
+ protected $filename;
+
+ private $source;
+
+ /**
+ * @param array $tokens An array of tokens
+ * @param string|null $name The name of the template which tokens are associated with
+ * @param string|null $source The source code associated with the tokens
+ */
+ public function __construct(array $tokens, $name = null, $source = null)
+ {
+ if (!$name instanceof Twig_Source) {
+ if (null !== $name || null !== $source) {
+ @trigger_error(sprintf('Passing a string as the $name argument of %s() is deprecated since version 1.27. Pass a Twig_Source instance instead.', __METHOD__), E_USER_DEPRECATED);
+ }
+ $this->source = new Twig_Source($source, $name);
+ } else {
+ $this->source = $name;
+ }
+
+ $this->tokens = $tokens;
+
+ // deprecated, not used anymore, to be removed in 2.0
+ $this->filename = $this->source->getName();
+ }
+
+ public function __toString()
+ {
+ return implode("\n", $this->tokens);
+ }
+
+ public function injectTokens(array $tokens)
+ {
+ $this->tokens = array_merge(array_slice($this->tokens, 0, $this->current), $tokens, array_slice($this->tokens, $this->current));
+ }
+
+ /**
+ * Sets the pointer to the next token and returns the old one.
+ *
+ * @return Twig_Token
+ */
+ public function next()
+ {
+ if (!isset($this->tokens[++$this->current])) {
+ throw new Twig_Error_Syntax('Unexpected end of template.', $this->tokens[$this->current - 1]->getLine(), $this->source);
+ }
+
+ return $this->tokens[$this->current - 1];
+ }
+
+ /**
+ * Tests a token, sets the pointer to the next one and returns it or throws a syntax error.
+ *
+ * @return Twig_Token|null The next token if the condition is true, null otherwise
+ */
+ public function nextIf($primary, $secondary = null)
+ {
+ if ($this->tokens[$this->current]->test($primary, $secondary)) {
+ return $this->next();
+ }
+ }
+
+ /**
+ * Tests a token and returns it or throws a syntax error.
+ *
+ * @return Twig_Token
+ */
+ public function expect($type, $value = null, $message = null)
+ {
+ $token = $this->tokens[$this->current];
+ if (!$token->test($type, $value)) {
+ $line = $token->getLine();
+ throw new Twig_Error_Syntax(sprintf('%sUnexpected token "%s" of value "%s" ("%s" expected%s).',
+ $message ? $message.'. ' : '',
+ Twig_Token::typeToEnglish($token->getType()), $token->getValue(),
+ Twig_Token::typeToEnglish($type), $value ? sprintf(' with value "%s"', $value) : ''),
+ $line,
+ $this->source
+ );
+ }
+ $this->next();
+
+ return $token;
+ }
+
+ /**
+ * Looks at the next token.
+ *
+ * @param int $number
+ *
+ * @return Twig_Token
+ */
+ public function look($number = 1)
+ {
+ if (!isset($this->tokens[$this->current + $number])) {
+ throw new Twig_Error_Syntax('Unexpected end of template.', $this->tokens[$this->current + $number - 1]->getLine(), $this->source);
+ }
+
+ return $this->tokens[$this->current + $number];
+ }
+
+ /**
+ * Tests the current token.
+ *
+ * @return bool
+ */
+ public function test($primary, $secondary = null)
+ {
+ return $this->tokens[$this->current]->test($primary, $secondary);
+ }
+
+ /**
+ * Checks if end of stream was reached.
+ *
+ * @return bool
+ */
+ public function isEOF()
+ {
+ return $this->tokens[$this->current]->getType() === Twig_Token::EOF_TYPE;
+ }
+
+ /**
+ * @return Twig_Token
+ */
+ public function getCurrent()
+ {
+ return $this->tokens[$this->current];
+ }
+
+ /**
+ * Gets the name associated with this stream (null if not defined).
+ *
+ * @return string|null
+ *
+ * @deprecated since 1.27 (to be removed in 2.0)
+ */
+ public function getFilename()
+ {
+ @trigger_error(sprintf('The %s() method is deprecated since version 1.27 and will be removed in 2.0. Use getSourceContext() instead.', __METHOD__), E_USER_DEPRECATED);
+
+ return $this->source->getName();
+ }
+
+ /**
+ * Gets the source code associated with this stream.
+ *
+ * @return string
+ *
+ * @internal Don't use this as it might be empty depending on the environment configuration
+ *
+ * @deprecated since 1.27 (to be removed in 2.0)
+ */
+ public function getSource()
+ {
+ @trigger_error(sprintf('The %s() method is deprecated since version 1.27 and will be removed in 2.0. Use getSourceContext() instead.', __METHOD__), E_USER_DEPRECATED);
+
+ return $this->source->getCode();
+ }
+
+ /**
+ * Gets the source associated with this stream.
+ *
+ * @return Twig_Source
+ *
+ * @internal
+ */
+ public function getSourceContext()
+ {
+ return $this->source;
+ }
+}