| 1 | <?php |
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| 2 | |
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| 3 | /* |
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| 4 | * This file is part of Twig. |
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| 5 | * |
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| 6 | * (c) 2009 Fabien Potencier |
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| 7 | * (c) 2009 Armin Ronacher |
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| 8 | * |
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| 9 | * For the full copyright and license information, please view the LICENSE |
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| 10 | * file that was distributed with this source code. |
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| 11 | */ |
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| 12 | |
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| 13 | /** |
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| 14 | * Lexes a template string. |
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| 15 | * |
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| 16 | * @package twig |
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| 17 | * @author Fabien Potencier <fabien@symfony.com> |
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| 18 | */ |
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| 19 | class Twig_Lexer implements Twig_LexerInterface |
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| 20 | { |
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| 21 | protected $tokens; |
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| 22 | protected $code; |
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| 23 | protected $cursor; |
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| 24 | protected $lineno; |
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| 25 | protected $end; |
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| 26 | protected $state; |
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| 27 | protected $states; |
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| 28 | protected $brackets; |
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| 29 | protected $env; |
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| 30 | protected $filename; |
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| 31 | protected $options; |
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| 32 | protected $regexes; |
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| 33 | protected $position; |
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| 34 | protected $positions; |
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| 35 | |
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| 36 | const STATE_DATA = 0; |
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| 37 | const STATE_BLOCK = 1; |
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| 38 | const STATE_VAR = 2; |
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| 39 | const STATE_STRING = 3; |
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| 40 | const STATE_INTERPOLATION = 4; |
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| 41 | |
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| 42 | const REGEX_NAME = '/[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*/A'; |
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| 43 | const REGEX_NUMBER = '/[0-9]+(?:\.[0-9]+)?/A'; |
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| 44 | const REGEX_STRING = '/"([^#"\\\\]*(?:\\\\.[^#"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\'/As'; |
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| 45 | const REGEX_DQ_STRING_DELIM = '/"/A'; |
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| 46 | const REGEX_DQ_STRING_PART = '/[^#"\\\\]*(?:(?:\\\\.|#(?!\{))[^#"\\\\]*)*/As'; |
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| 47 | const PUNCTUATION = '()[]{}?:.,|'; |
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| 48 | |
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| 49 | public function __construct(Twig_Environment $env, array $options = array()) |
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| 50 | { |
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| 51 | $this->env = $env; |
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| 52 | |
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| 53 | $this->options = array_merge(array( |
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| 54 | 'tag_comment' => array('{#', '#}'), |
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| 55 | 'tag_block' => array('{%', '%}'), |
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| 56 | 'tag_variable' => array('{{', '}}'), |
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| 57 | 'whitespace_trim' => '-', |
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| 58 | 'interpolation' => array('#{', '}'), |
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| 59 | ), $options); |
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| 60 | |
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| 61 | $this->regexes = array( |
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| 62 | 'lex_var' => '/\s*'.preg_quote($this->options['whitespace_trim'].$this->options['tag_variable'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_variable'][1], '/').'/A', |
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| 63 | 'lex_block' => '/\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')\n?/A', |
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| 64 | 'lex_raw_data' => '/('.preg_quote($this->options['tag_block'][0].$this->options['whitespace_trim'], '/').'|'.preg_quote($this->options['tag_block'][0], '/').')\s*endraw\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')/s', |
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| 65 | 'operator' => $this->getOperatorRegex(), |
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| 66 | 'lex_comment' => '/(?:'.preg_quote($this->options['whitespace_trim'], '/').preg_quote($this->options['tag_comment'][1], '/').'\s*|'.preg_quote($this->options['tag_comment'][1], '/').')\n?/s', |
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| 67 | 'lex_block_raw' => '/\s*raw\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')/As', |
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| 68 | 'lex_block_line' => '/\s*line\s+(\d+)\s*'.preg_quote($this->options['tag_block'][1], '/').'/As', |
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| 69 | 'lex_tokens_start' => '/('.preg_quote($this->options['tag_variable'][0], '/').'|'.preg_quote($this->options['tag_block'][0], '/').'|'.preg_quote($this->options['tag_comment'][0], '/').')('.preg_quote($this->options['whitespace_trim'], '/').')?/s', |
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| 70 | 'interpolation_start' => '/'.preg_quote($this->options['interpolation'][0], '/').'\s*/A', |
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| 71 | 'interpolation_end' => '/\s*'.preg_quote($this->options['interpolation'][1], '/').'/A', |
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| 72 | ); |
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| 73 | } |
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| 74 | |
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| 75 | /** |
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| 76 | * Tokenizes a source code. |
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| 77 | * |
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| 78 | * @param string $code The source code |
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| 79 | * @param string $filename A unique identifier for the source code |
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| 80 | * |
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| 81 | * @return Twig_TokenStream A token stream instance |
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| 82 | */ |
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| 83 | public function tokenize($code, $filename = null) |
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| 84 | { |
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| 85 | if (function_exists('mb_internal_encoding') && ((int) ini_get('mbstring.func_overload')) & 2) { |
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| 86 | $mbEncoding = mb_internal_encoding(); |
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| 87 | mb_internal_encoding('ASCII'); |
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| 88 | } |
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| 89 | |
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| 90 | $this->code = str_replace(array("\r\n", "\r"), "\n", $code); |
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| 91 | $this->filename = $filename; |
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| 92 | $this->cursor = 0; |
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| 93 | $this->lineno = 1; |
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| 94 | $this->end = strlen($this->code); |
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| 95 | $this->tokens = array(); |
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| 96 | $this->state = self::STATE_DATA; |
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| 97 | $this->states = array(); |
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| 98 | $this->brackets = array(); |
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| 99 | $this->position = -1; |
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| 100 | |
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| 101 | // find all token starts in one go |
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| 102 | preg_match_all($this->regexes['lex_tokens_start'], $this->code, $matches, PREG_OFFSET_CAPTURE); |
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| 103 | $this->positions = $matches; |
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| 104 | |
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| 105 | while ($this->cursor < $this->end) { |
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| 106 | // dispatch to the lexing functions depending |
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| 107 | // on the current state |
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| 108 | switch ($this->state) { |
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| 109 | case self::STATE_DATA: |
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| 110 | $this->lexData(); |
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| 111 | break; |
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| 112 | |
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| 113 | case self::STATE_BLOCK: |
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| 114 | $this->lexBlock(); |
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| 115 | break; |
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| 116 | |
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| 117 | case self::STATE_VAR: |
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| 118 | $this->lexVar(); |
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| 119 | break; |
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| 120 | |
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| 121 | case self::STATE_STRING: |
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| 122 | $this->lexString(); |
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| 123 | break; |
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| 124 | |
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| 125 | case self::STATE_INTERPOLATION: |
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| 126 | $this->lexInterpolation(); |
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| 127 | break; |
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| 128 | } |
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| 129 | } |
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| 130 | |
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| 131 | $this->pushToken(Twig_Token::EOF_TYPE); |
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| 132 | |
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| 133 | if (!empty($this->brackets)) { |
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| 134 | list($expect, $lineno) = array_pop($this->brackets); |
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| 135 | throw new Twig_Error_Syntax(sprintf('Unclosed "%s"', $expect), $lineno, $this->filename); |
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| 136 | } |
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| 137 | |
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| 138 | if (isset($mbEncoding)) { |
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| 139 | mb_internal_encoding($mbEncoding); |
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| 140 | } |
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| 141 | |
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| 142 | return new Twig_TokenStream($this->tokens, $this->filename); |
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| 143 | } |
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| 144 | |
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| 145 | protected function lexData() |
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| 146 | { |
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| 147 | // if no matches are left we return the rest of the template as simple text token |
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| 148 | if ($this->position == count($this->positions[0]) - 1) { |
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| 149 | $this->pushToken(Twig_Token::TEXT_TYPE, substr($this->code, $this->cursor)); |
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| 150 | $this->cursor = $this->end; |
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| 151 | |
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| 152 | return; |
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| 153 | } |
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| 154 | |
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| 155 | // Find the first token after the current cursor |
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| 156 | $position = $this->positions[0][++$this->position]; |
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| 157 | while ($position[1] < $this->cursor) { |
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| 158 | if ($this->position == count($this->positions[0]) - 1) { |
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| 159 | return; |
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| 160 | } |
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| 161 | $position = $this->positions[0][++$this->position]; |
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| 162 | } |
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| 163 | |
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| 164 | // push the template text first |
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| 165 | $text = $textContent = substr($this->code, $this->cursor, $position[1] - $this->cursor); |
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| 166 | if (isset($this->positions[2][$this->position][0])) { |
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| 167 | $text = rtrim($text); |
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| 168 | } |
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| 169 | $this->pushToken(Twig_Token::TEXT_TYPE, $text); |
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| 170 | $this->moveCursor($textContent.$position[0]); |
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| 171 | |
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| 172 | switch ($this->positions[1][$this->position][0]) { |
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| 173 | case $this->options['tag_comment'][0]: |
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| 174 | $this->lexComment(); |
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| 175 | break; |
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| 176 | |
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| 177 | case $this->options['tag_block'][0]: |
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| 178 | // raw data? |
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| 179 | if (preg_match($this->regexes['lex_block_raw'], $this->code, $match, null, $this->cursor)) { |
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| 180 | $this->moveCursor($match[0]); |
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| 181 | $this->lexRawData(); |
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| 182 | // {% line \d+ %} |
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| 183 | } elseif (preg_match($this->regexes['lex_block_line'], $this->code, $match, null, $this->cursor)) { |
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| 184 | $this->moveCursor($match[0]); |
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| 185 | $this->lineno = (int) $match[1]; |
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| 186 | } else { |
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| 187 | $this->pushToken(Twig_Token::BLOCK_START_TYPE); |
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| 188 | $this->pushState(self::STATE_BLOCK); |
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| 189 | } |
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| 190 | break; |
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| 191 | |
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| 192 | case $this->options['tag_variable'][0]: |
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| 193 | $this->pushToken(Twig_Token::VAR_START_TYPE); |
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| 194 | $this->pushState(self::STATE_VAR); |
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| 195 | break; |
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| 196 | } |
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| 197 | } |
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| 198 | |
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| 199 | protected function lexBlock() |
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| 200 | { |
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| 201 | if (empty($this->brackets) && preg_match($this->regexes['lex_block'], $this->code, $match, null, $this->cursor)) { |
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| 202 | $this->pushToken(Twig_Token::BLOCK_END_TYPE); |
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| 203 | $this->moveCursor($match[0]); |
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| 204 | $this->popState(); |
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| 205 | } else { |
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| 206 | $this->lexExpression(); |
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| 207 | } |
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| 208 | } |
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| 209 | |
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| 210 | protected function lexVar() |
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| 211 | { |
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| 212 | if (empty($this->brackets) && preg_match($this->regexes['lex_var'], $this->code, $match, null, $this->cursor)) { |
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| 213 | $this->pushToken(Twig_Token::VAR_END_TYPE); |
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| 214 | $this->moveCursor($match[0]); |
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| 215 | $this->popState(); |
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| 216 | } else { |
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| 217 | $this->lexExpression(); |
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| 218 | } |
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| 219 | } |
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| 220 | |
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| 221 | protected function lexExpression() |
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| 222 | { |
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| 223 | // whitespace |
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| 224 | if (preg_match('/\s+/A', $this->code, $match, null, $this->cursor)) { |
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| 225 | $this->moveCursor($match[0]); |
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| 226 | |
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| 227 | if ($this->cursor >= $this->end) { |
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| 228 | throw new Twig_Error_Syntax(sprintf('Unexpected end of file: Unclosed "%s"', $this->state === self::STATE_BLOCK ? 'block' : 'variable'), $this->lineno, $this->filename); |
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| 229 | } |
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| 230 | } |
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| 231 | |
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| 232 | // operators |
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| 233 | if (preg_match($this->regexes['operator'], $this->code, $match, null, $this->cursor)) { |
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| 234 | $this->pushToken(Twig_Token::OPERATOR_TYPE, $match[0]); |
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| 235 | $this->moveCursor($match[0]); |
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| 236 | } |
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| 237 | // names |
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| 238 | elseif (preg_match(self::REGEX_NAME, $this->code, $match, null, $this->cursor)) { |
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| 239 | $this->pushToken(Twig_Token::NAME_TYPE, $match[0]); |
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| 240 | $this->moveCursor($match[0]); |
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| 241 | } |
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| 242 | // numbers |
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| 243 | elseif (preg_match(self::REGEX_NUMBER, $this->code, $match, null, $this->cursor)) { |
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| 244 | $number = (float) $match[0]; // floats |
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| 245 | if (ctype_digit($match[0]) && $number <= PHP_INT_MAX) { |
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| 246 | $number = (int) $match[0]; // integers lower than the maximum |
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| 247 | } |
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| 248 | $this->pushToken(Twig_Token::NUMBER_TYPE, $number); |
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| 249 | $this->moveCursor($match[0]); |
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| 250 | } |
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| 251 | // punctuation |
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| 252 | elseif (false !== strpos(self::PUNCTUATION, $this->code[$this->cursor])) { |
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| 253 | // opening bracket |
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| 254 | if (false !== strpos('([{', $this->code[$this->cursor])) { |
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| 255 | $this->brackets[] = array($this->code[$this->cursor], $this->lineno); |
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| 256 | } |
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| 257 | // closing bracket |
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| 258 | elseif (false !== strpos(')]}', $this->code[$this->cursor])) { |
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| 259 | if (empty($this->brackets)) { |
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| 260 | throw new Twig_Error_Syntax(sprintf('Unexpected "%s"', $this->code[$this->cursor]), $this->lineno, $this->filename); |
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| 261 | } |
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| 262 | |
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| 263 | list($expect, $lineno) = array_pop($this->brackets); |
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| 264 | if ($this->code[$this->cursor] != strtr($expect, '([{', ')]}')) { |
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| 265 | throw new Twig_Error_Syntax(sprintf('Unclosed "%s"', $expect), $lineno, $this->filename); |
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| 266 | } |
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| 267 | } |
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| 268 | |
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| 269 | $this->pushToken(Twig_Token::PUNCTUATION_TYPE, $this->code[$this->cursor]); |
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| 270 | ++$this->cursor; |
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| 271 | } |
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| 272 | // strings |
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| 273 | elseif (preg_match(self::REGEX_STRING, $this->code, $match, null, $this->cursor)) { |
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| 274 | $this->pushToken(Twig_Token::STRING_TYPE, stripcslashes(substr($match[0], 1, -1))); |
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| 275 | $this->moveCursor($match[0]); |
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| 276 | } |
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| 277 | // opening double quoted string |
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| 278 | elseif (preg_match(self::REGEX_DQ_STRING_DELIM, $this->code, $match, null, $this->cursor)) { |
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| 279 | $this->brackets[] = array('"', $this->lineno); |
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| 280 | $this->pushState(self::STATE_STRING); |
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| 281 | $this->moveCursor($match[0]); |
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| 282 | } |
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| 283 | // unlexable |
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| 284 | else { |
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| 285 | throw new Twig_Error_Syntax(sprintf('Unexpected character "%s"', $this->code[$this->cursor]), $this->lineno, $this->filename); |
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| 286 | } |
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| 287 | } |
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| 288 | |
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| 289 | protected function lexRawData() |
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| 290 | { |
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| 291 | if (!preg_match($this->regexes['lex_raw_data'], $this->code, $match, PREG_OFFSET_CAPTURE, $this->cursor)) { |
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| 292 | throw new Twig_Error_Syntax(sprintf('Unexpected end of file: Unclosed "block"'), $this->lineno, $this->filename); |
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| 293 | } |
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| 294 | |
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| 295 | $text = substr($this->code, $this->cursor, $match[0][1] - $this->cursor); |
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| 296 | $this->moveCursor($text.$match[0][0]); |
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| 297 | |
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| 298 | if (false !== strpos($match[1][0], $this->options['whitespace_trim'])) { |
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| 299 | $text = rtrim($text); |
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| 300 | } |
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| 301 | |
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| 302 | $this->pushToken(Twig_Token::TEXT_TYPE, $text); |
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| 303 | } |
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| 304 | |
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| 305 | protected function lexComment() |
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| 306 | { |
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| 307 | if (!preg_match($this->regexes['lex_comment'], $this->code, $match, PREG_OFFSET_CAPTURE, $this->cursor)) { |
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| 308 | throw new Twig_Error_Syntax('Unclosed comment', $this->lineno, $this->filename); |
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| 309 | } |
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| 310 | |
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| 311 | $this->moveCursor(substr($this->code, $this->cursor, $match[0][1] - $this->cursor).$match[0][0]); |
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| 312 | } |
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| 313 | |
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| 314 | protected function lexString() |
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| 315 | { |
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| 316 | if (preg_match($this->regexes['interpolation_start'], $this->code, $match, null, $this->cursor)) { |
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| 317 | $this->brackets[] = array($this->options['interpolation'][0], $this->lineno); |
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| 318 | $this->pushToken(Twig_Token::INTERPOLATION_START_TYPE); |
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| 319 | $this->moveCursor($match[0]); |
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| 320 | $this->pushState(self::STATE_INTERPOLATION); |
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| 321 | |
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| 322 | } elseif (preg_match(self::REGEX_DQ_STRING_PART, $this->code, $match, null, $this->cursor) && strlen($match[0]) > 0) { |
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| 323 | $this->pushToken(Twig_Token::STRING_TYPE, stripcslashes($match[0])); |
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| 324 | $this->moveCursor($match[0]); |
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| 325 | |
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| 326 | } elseif (preg_match(self::REGEX_DQ_STRING_DELIM, $this->code, $match, null, $this->cursor)) { |
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| 327 | |
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| 328 | list($expect, $lineno) = array_pop($this->brackets); |
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| 329 | if ($this->code[$this->cursor] != '"') { |
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| 330 | throw new Twig_Error_Syntax(sprintf('Unclosed "%s"', $expect), $lineno, $this->filename); |
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| 331 | } |
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| 332 | |
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| 333 | $this->popState(); |
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| 334 | ++$this->cursor; |
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| 335 | } |
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| 336 | } |
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| 337 | |
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| 338 | protected function lexInterpolation() |
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| 339 | { |
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| 340 | $bracket = end($this->brackets); |
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| 341 | if ($this->options['interpolation'][0] === $bracket[0] && preg_match($this->regexes['interpolation_end'], $this->code, $match, null, $this->cursor)) { |
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| 342 | array_pop($this->brackets); |
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| 343 | $this->pushToken(Twig_Token::INTERPOLATION_END_TYPE); |
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| 344 | $this->moveCursor($match[0]); |
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| 345 | $this->popState(); |
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| 346 | } else { |
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| 347 | $this->lexExpression(); |
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| 348 | } |
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| 349 | } |
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| 350 | |
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| 351 | protected function pushToken($type, $value = '') |
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| 352 | { |
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| 353 | // do not push empty text tokens |
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| 354 | if (Twig_Token::TEXT_TYPE === $type && '' === $value) { |
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| 355 | return; |
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| 356 | } |
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| 357 | |
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| 358 | $this->tokens[] = new Twig_Token($type, $value, $this->lineno); |
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| 359 | } |
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| 360 | |
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| 361 | protected function moveCursor($text) |
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| 362 | { |
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| 363 | $this->cursor += strlen($text); |
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| 364 | $this->lineno += substr_count($text, "\n"); |
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| 365 | } |
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| 366 | |
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| 367 | protected function getOperatorRegex() |
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| 368 | { |
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| 369 | $operators = array_merge( |
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| 370 | array('='), |
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| 371 | array_keys($this->env->getUnaryOperators()), |
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| 372 | array_keys($this->env->getBinaryOperators()) |
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| 373 | ); |
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| 374 | |
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| 375 | $operators = array_combine($operators, array_map('strlen', $operators)); |
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| 376 | arsort($operators); |
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| 377 | |
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| 378 | $regex = array(); |
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| 379 | foreach ($operators as $operator => $length) { |
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| 380 | // an operator that ends with a character must be followed by |
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| 381 | // a whitespace or a parenthesis |
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| 382 | if (ctype_alpha($operator[$length - 1])) { |
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| 383 | $regex[] = preg_quote($operator, '/').'(?=[\s()])'; |
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| 384 | } else { |
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| 385 | $regex[] = preg_quote($operator, '/'); |
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| 386 | } |
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| 387 | } |
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| 388 | |
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| 389 | return '/'.implode('|', $regex).'/A'; |
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| 390 | } |
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| 391 | |
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| 392 | protected function pushState($state) |
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| 393 | { |
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| 394 | $this->states[] = $this->state; |
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| 395 | $this->state = $state; |
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| 396 | } |
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| 397 | |
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| 398 | protected function popState() |
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| 399 | { |
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| 400 | if (0 === count($this->states)) { |
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| 401 | throw new Exception('Cannot pop state without a previous state'); |
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| 402 | } |
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| 403 | |
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| 404 | $this->state = array_pop($this->states); |
|---|
| 405 | } |
|---|
| 406 | } |
|---|