Verzeichnisstruktur phpBB-3.1.0
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- 27.10.2014
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TokenStream.php
001 <?php
002
003 /*
004 * This file is part of Twig.
005 *
006 * (c) 2009 Fabien Potencier
007 * (c) 2009 Armin Ronacher
008 *
009 * For the full copyright and license information, please view the LICENSE
010 * file that was distributed with this source code.
011 */
012
013 /**
014 * Represents a token stream.
015 *
016 * @author Fabien Potencier <fabien@symfony.com>
017 */
018 class Twig_TokenStream
019 {
020 protected $tokens;
021 protected $current;
022 protected $filename;
023
024 /**
025 * Constructor.
026 *
027 * @param array $tokens An array of tokens
028 * @param string $filename The name of the filename which tokens are associated with
029 */
030 public function __construct(array $tokens, $filename = null)
031 {
032 $this->tokens = $tokens;
033 $this->current = 0;
034 $this->filename = $filename;
035 }
036
037 /**
038 * Returns a string representation of the token stream.
039 *
040 * @return string
041 */
042 public function __toString()
043 {
044 return implode("\n", $this->tokens);
045 }
046
047 public function injectTokens(array $tokens)
048 {
049 $this->tokens = array_merge(array_slice($this->tokens, 0, $this->current), $tokens, array_slice($this->tokens, $this->current));
050 }
051
052 /**
053 * Sets the pointer to the next token and returns the old one.
054 *
055 * @return Twig_Token
056 */
057 public function next()
058 {
059 if (!isset($this->tokens[++$this->current])) {
060 throw new Twig_Error_Syntax('Unexpected end of template', $this->tokens[$this->current - 1]->getLine(), $this->filename);
061 }
062
063 return $this->tokens[$this->current - 1];
064 }
065
066 /**
067 * Tests a token and returns it or throws a syntax error.
068 *
069 * @return Twig_Token
070 */
071 public function expect($type, $value = null, $message = null)
072 {
073 $token = $this->tokens[$this->current];
074 if (!$token->test($type, $value)) {
075 $line = $token->getLine();
076 throw new Twig_Error_Syntax(sprintf('%sUnexpected token "%s" of value "%s" ("%s" expected%s)',
077 $message ? $message.'. ' : '',
078 Twig_Token::typeToEnglish($token->getType(), $line), $token->getValue(),
079 Twig_Token::typeToEnglish($type, $line), $value ? sprintf(' with value "%s"', $value) : ''),
080 $line,
081 $this->filename
082 );
083 }
084 $this->next();
085
086 return $token;
087 }
088
089 /**
090 * Looks at the next token.
091 *
092 * @param integer $number
093 *
094 * @return Twig_Token
095 */
096 public function look($number = 1)
097 {
098 if (!isset($this->tokens[$this->current + $number])) {
099 throw new Twig_Error_Syntax('Unexpected end of template', $this->tokens[$this->current + $number - 1]->getLine(), $this->filename);
100 }
101
102 return $this->tokens[$this->current + $number];
103 }
104
105 /**
106 * Tests the current token
107 *
108 * @return bool
109 */
110 public function test($primary, $secondary = null)
111 {
112 return $this->tokens[$this->current]->test($primary, $secondary);
113 }
114
115 /**
116 * Checks if end of stream was reached
117 *
118 * @return bool
119 */
120 public function isEOF()
121 {
122 return $this->tokens[$this->current]->getType() === Twig_Token::EOF_TYPE;
123 }
124
125 /**
126 * Gets the current token
127 *
128 * @return Twig_Token
129 */
130 public function getCurrent()
131 {
132 return $this->tokens[$this->current];
133 }
134
135 /**
136 * Gets the filename associated with this stream
137 *
138 * @return string
139 */
140 public function getFilename()
141 {
142 return $this->filename;
143 }
144 }
145