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Lexer.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 * Lexes a template string.
015 *
016 * @author Fabien Potencier <fabien@symfony.com>
017 */
018 class Twig_Lexer implements Twig_LexerInterface
019 {
020 protected $tokens;
021 protected $code;
022 protected $cursor;
023 protected $lineno;
024 protected $end;
025 protected $state;
026 protected $states;
027 protected $brackets;
028 protected $env;
029 protected $filename;
030 protected $options;
031 protected $regexes;
032 protected $position;
033 protected $positions;
034 protected $currentVarBlockLine;
035
036 const STATE_DATA = 0;
037 const STATE_BLOCK = 1;
038 const STATE_VAR = 2;
039 const STATE_STRING = 3;
040 const STATE_INTERPOLATION = 4;
041
042 const REGEX_NAME = '/[a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*/A';
043 const REGEX_NUMBER = '/[0-9]+(?:\.[0-9]+)?/A';
044 const REGEX_STRING = '/"([^#"\\\\]*(?:\\\\.[^#"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\'/As';
045 const REGEX_DQ_STRING_DELIM = '/"/A';
046 const REGEX_DQ_STRING_PART = '/[^#"\\\\]*(?:(?:\\\\.|#(?!\{))[^#"\\\\]*)*/As';
047 const PUNCTUATION = '()[]{}?:.,|';
048
049 public function __construct(Twig_Environment $env, array $options = array())
050 {
051 $this->env = $env;
052
053 $this->options = array_merge(array(
054 'tag_comment' => array('{#', '#}'),
055 'tag_block' => array('{%', '%}'),
056 'tag_variable' => array('{{', '}}'),
057 'whitespace_trim' => '-',
058 'interpolation' => array('#{', '}'),
059 ), $options);
060
061 $this->regexes = array(
062 'lex_var' => '/\s*'.preg_quote($this->options['whitespace_trim'].$this->options['tag_variable'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_variable'][1], '/').'/A',
063 'lex_block' => '/\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')\n?/A',
064 'lex_raw_data' => '/('.preg_quote($this->options['tag_block'][0].$this->options['whitespace_trim'], '/').'|'.preg_quote($this->options['tag_block'][0], '/').')\s*(?:end%s)\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')/s',
065 'operator' => $this->getOperatorRegex(),
066 'lex_comment' => '/(?:'.preg_quote($this->options['whitespace_trim'], '/').preg_quote($this->options['tag_comment'][1], '/').'\s*|'.preg_quote($this->options['tag_comment'][1], '/').')\n?/s',
067 'lex_block_raw' => '/\s*(raw|verbatim)\s*(?:'.preg_quote($this->options['whitespace_trim'].$this->options['tag_block'][1], '/').'\s*|\s*'.preg_quote($this->options['tag_block'][1], '/').')/As',
068 'lex_block_line' => '/\s*line\s+(\d+)\s*'.preg_quote($this->options['tag_block'][1], '/').'/As',
069 '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',
070 'interpolation_start' => '/'.preg_quote($this->options['interpolation'][0], '/').'\s*/A',
071 'interpolation_end' => '/\s*'.preg_quote($this->options['interpolation'][1], '/').'/A',
072 );
073 }
074
075 /**
076 * {@inheritdoc}
077 */
078 public function tokenize($code, $filename = null)
079 {
080 if (function_exists('mb_internal_encoding') && ((int) ini_get('mbstring.func_overload')) & 2) {
081 $mbEncoding = mb_internal_encoding();
082 mb_internal_encoding('ASCII');
083 } else {
084 $mbEncoding = null;
085 }
086
087 $this->code = str_replace(array("\r\n", "\r"), "\n", $code);
088 $this->filename = $filename;
089 $this->cursor = 0;
090 $this->lineno = 1;
091 $this->end = strlen($this->code);
092 $this->tokens = array();
093 $this->state = self::STATE_DATA;
094 $this->states = array();
095 $this->brackets = array();
096 $this->position = -1;
097
098 // find all token starts in one go
099 preg_match_all($this->regexes['lex_tokens_start'], $this->code, $matches, PREG_OFFSET_CAPTURE);
100 $this->positions = $matches;
101
102 while ($this->cursor < $this->end) {
103 // dispatch to the lexing functions depending
104 // on the current state
105 switch ($this->state) {
106 case self::STATE_DATA:
107 $this->lexData();
108 break;
109
110 case self::STATE_BLOCK:
111 $this->lexBlock();
112 break;
113
114 case self::STATE_VAR:
115 $this->lexVar();
116 break;
117
118 case self::STATE_STRING:
119 $this->lexString();
120 break;
121
122 case self::STATE_INTERPOLATION:
123 $this->lexInterpolation();
124 break;
125 }
126 }
127
128 $this->pushToken(Twig_Token::EOF_TYPE);
129
130 if (!empty($this->brackets)) {
131 list($expect, $lineno) = array_pop($this->brackets);
132 throw new Twig_Error_Syntax(sprintf('Unclosed "%s".', $expect), $lineno, $this->filename);
133 }
134
135 if ($mbEncoding) {
136 mb_internal_encoding($mbEncoding);
137 }
138
139 return new Twig_TokenStream($this->tokens, $this->filename);
140 }
141
142 protected function lexData()
143 {
144 // if no matches are left we return the rest of the template as simple text token
145 if ($this->position == count($this->positions[0]) - 1) {
146 $this->pushToken(Twig_Token::TEXT_TYPE, substr($this->code, $this->cursor));
147 $this->cursor = $this->end;
148
149 return;
150 }
151
152 // Find the first token after the current cursor
153 $position = $this->positions[0][++$this->position];
154 while ($position[1] < $this->cursor) {
155 if ($this->position == count($this->positions[0]) - 1) {
156 return;
157 }
158 $position = $this->positions[0][++$this->position];
159 }
160
161 // push the template text first
162 $text = $textContent = substr($this->code, $this->cursor, $position[1] - $this->cursor);
163 if (isset($this->positions[2][$this->position][0])) {
164 $text = rtrim($text);
165 }
166 $this->pushToken(Twig_Token::TEXT_TYPE, $text);
167 $this->moveCursor($textContent.$position[0]);
168
169 switch ($this->positions[1][$this->position][0]) {
170 case $this->options['tag_comment'][0]:
171 $this->lexComment();
172 break;
173
174 case $this->options['tag_block'][0]:
175 // raw data?
176 if (preg_match($this->regexes['lex_block_raw'], $this->code, $match, null, $this->cursor)) {
177 $this->moveCursor($match[0]);
178 $this->lexRawData($match[1]);
179 // {% line \d+ %}
180 } elseif (preg_match($this->regexes['lex_block_line'], $this->code, $match, null, $this->cursor)) {
181 $this->moveCursor($match[0]);
182 $this->lineno = (int) $match[1];
183 } else {
184 $this->pushToken(Twig_Token::BLOCK_START_TYPE);
185 $this->pushState(self::STATE_BLOCK);
186 $this->currentVarBlockLine = $this->lineno;
187 }
188 break;
189
190 case $this->options['tag_variable'][0]:
191 $this->pushToken(Twig_Token::VAR_START_TYPE);
192 $this->pushState(self::STATE_VAR);
193 $this->currentVarBlockLine = $this->lineno;
194 break;
195 }
196 }
197
198 protected function lexBlock()
199 {
200 if (empty($this->brackets) && preg_match($this->regexes['lex_block'], $this->code, $match, null, $this->cursor)) {
201 $this->pushToken(Twig_Token::BLOCK_END_TYPE);
202 $this->moveCursor($match[0]);
203 $this->popState();
204 } else {
205 $this->lexExpression();
206 }
207 }
208
209 protected function lexVar()
210 {
211 if (empty($this->brackets) && preg_match($this->regexes['lex_var'], $this->code, $match, null, $this->cursor)) {
212 $this->pushToken(Twig_Token::VAR_END_TYPE);
213 $this->moveCursor($match[0]);
214 $this->popState();
215 } else {
216 $this->lexExpression();
217 }
218 }
219
220 protected function lexExpression()
221 {
222 // whitespace
223 if (preg_match('/\s+/A', $this->code, $match, null, $this->cursor)) {
224 $this->moveCursor($match[0]);
225
226 if ($this->cursor >= $this->end) {
227 throw new Twig_Error_Syntax(sprintf('Unclosed "%s".', $this->state === self::STATE_BLOCK ? 'block' : 'variable'), $this->currentVarBlockLine, $this->filename);
228 }
229 }
230
231 // operators
232 if (preg_match($this->regexes['operator'], $this->code, $match, null, $this->cursor)) {
233 $this->pushToken(Twig_Token::OPERATOR_TYPE, preg_replace('/\s+/', ' ', $match[0]));
234 $this->moveCursor($match[0]);
235 }
236 // names
237 elseif (preg_match(self::REGEX_NAME, $this->code, $match, null, $this->cursor)) {
238 $this->pushToken(Twig_Token::NAME_TYPE, $match[0]);
239 $this->moveCursor($match[0]);
240 }
241 // numbers
242 elseif (preg_match(self::REGEX_NUMBER, $this->code, $match, null, $this->cursor)) {
243 $number = (float) $match[0]; // floats
244 if (ctype_digit($match[0]) && $number <= PHP_INT_MAX) {
245 $number = (int) $match[0]; // integers lower than the maximum
246 }
247 $this->pushToken(Twig_Token::NUMBER_TYPE, $number);
248 $this->moveCursor($match[0]);
249 }
250 // punctuation
251 elseif (false !== strpos(self::PUNCTUATION, $this->code[$this->cursor])) {
252 // opening bracket
253 if (false !== strpos('([{', $this->code[$this->cursor])) {
254 $this->brackets[] = array($this->code[$this->cursor], $this->lineno);
255 }
256 // closing bracket
257 elseif (false !== strpos(')]}', $this->code[$this->cursor])) {
258 if (empty($this->brackets)) {
259 throw new Twig_Error_Syntax(sprintf('Unexpected "%s".', $this->code[$this->cursor]), $this->lineno, $this->filename);
260 }
261
262 list($expect, $lineno) = array_pop($this->brackets);
263 if ($this->code[$this->cursor] != strtr($expect, '([{', ')]}')) {
264 throw new Twig_Error_Syntax(sprintf('Unclosed "%s".', $expect), $lineno, $this->filename);
265 }
266 }
267
268 $this->pushToken(Twig_Token::PUNCTUATION_TYPE, $this->code[$this->cursor]);
269 ++$this->cursor;
270 }
271 // strings
272 elseif (preg_match(self::REGEX_STRING, $this->code, $match, null, $this->cursor)) {
273 $this->pushToken(Twig_Token::STRING_TYPE, stripcslashes(substr($match[0], 1, -1)));
274 $this->moveCursor($match[0]);
275 }
276 // opening double quoted string
277 elseif (preg_match(self::REGEX_DQ_STRING_DELIM, $this->code, $match, null, $this->cursor)) {
278 $this->brackets[] = array('"', $this->lineno);
279 $this->pushState(self::STATE_STRING);
280 $this->moveCursor($match[0]);
281 }
282 // unlexable
283 else {
284 throw new Twig_Error_Syntax(sprintf('Unexpected character "%s".', $this->code[$this->cursor]), $this->lineno, $this->filename);
285 }
286 }
287
288 protected function lexRawData($tag)
289 {
290 if ('raw' === $tag) {
291 @trigger_error(sprintf('Twig Tag "raw" is deprecated since version 1.21. Use "verbatim" instead in %s at line %d.', $this->filename, $this->lineno), E_USER_DEPRECATED);
292 }
293
294 if (!preg_match(str_replace('%s', $tag, $this->regexes['lex_raw_data']), $this->code, $match, PREG_OFFSET_CAPTURE, $this->cursor)) {
295 throw new Twig_Error_Syntax(sprintf('Unexpected end of file: Unclosed "%s" block.', $tag), $this->lineno, $this->filename);
296 }
297
298 $text = substr($this->code, $this->cursor, $match[0][1] - $this->cursor);
299 $this->moveCursor($text.$match[0][0]);
300
301 if (false !== strpos($match[1][0], $this->options['whitespace_trim'])) {
302 $text = rtrim($text);
303 }
304
305 $this->pushToken(Twig_Token::TEXT_TYPE, $text);
306 }
307
308 protected function lexComment()
309 {
310 if (!preg_match($this->regexes['lex_comment'], $this->code, $match, PREG_OFFSET_CAPTURE, $this->cursor)) {
311 throw new Twig_Error_Syntax('Unclosed comment.', $this->lineno, $this->filename);
312 }
313
314 $this->moveCursor(substr($this->code, $this->cursor, $match[0][1] - $this->cursor).$match[0][0]);
315 }
316
317 protected function lexString()
318 {
319 if (preg_match($this->regexes['interpolation_start'], $this->code, $match, null, $this->cursor)) {
320 $this->brackets[] = array($this->options['interpolation'][0], $this->lineno);
321 $this->pushToken(Twig_Token::INTERPOLATION_START_TYPE);
322 $this->moveCursor($match[0]);
323 $this->pushState(self::STATE_INTERPOLATION);
324 } elseif (preg_match(self::REGEX_DQ_STRING_PART, $this->code, $match, null, $this->cursor) && strlen($match[0]) > 0) {
325 $this->pushToken(Twig_Token::STRING_TYPE, stripcslashes($match[0]));
326 $this->moveCursor($match[0]);
327 } elseif (preg_match(self::REGEX_DQ_STRING_DELIM, $this->code, $match, null, $this->cursor)) {
328 list($expect, $lineno) = array_pop($this->brackets);
329 if ($this->code[$this->cursor] != '"') {
330 throw new Twig_Error_Syntax(sprintf('Unclosed "%s".', $expect), $lineno, $this->filename);
331 }
332
333 $this->popState();
334 ++$this->cursor;
335 }
336 }
337
338 protected function lexInterpolation()
339 {
340 $bracket = end($this->brackets);
341 if ($this->options['interpolation'][0] === $bracket[0] && preg_match($this->regexes['interpolation_end'], $this->code, $match, null, $this->cursor)) {
342 array_pop($this->brackets);
343 $this->pushToken(Twig_Token::INTERPOLATION_END_TYPE);
344 $this->moveCursor($match[0]);
345 $this->popState();
346 } else {
347 $this->lexExpression();
348 }
349 }
350
351 protected function pushToken($type, $value = '')
352 {
353 // do not push empty text tokens
354 if (Twig_Token::TEXT_TYPE === $type && '' === $value) {
355 return;
356 }
357
358 $this->tokens[] = new Twig_Token($type, $value, $this->lineno);
359 }
360
361 protected function moveCursor($text)
362 {
363 $this->cursor += strlen($text);
364 $this->lineno += substr_count($text, "\n");
365 }
366
367 protected function getOperatorRegex()
368 {
369 $operators = array_merge(
370 array('='),
371 array_keys($this->env->getUnaryOperators()),
372 array_keys($this->env->getBinaryOperators())
373 );
374
375 $operators = array_combine($operators, array_map('strlen', $operators));
376 arsort($operators);
377
378 $regex = array();
379 foreach ($operators as $operator => $length) {
380 // an operator that ends with a character must be followed by
381 // a whitespace or a parenthesis
382 if (ctype_alpha($operator[$length - 1])) {
383 $r = preg_quote($operator, '/').'(?=[\s()])';
384 } else {
385 $r = preg_quote($operator, '/');
386 }
387
388 // an operator with a space can be any amount of whitespaces
389 $r = preg_replace('/\s+/', '\s+', $r);
390
391 $regex[] = $r;
392 }
393
394 return '/'.implode('|', $regex).'/A';
395 }
396
397 protected function pushState($state)
398 {
399 $this->states[] = $this->state;
400 $this->state = $state;
401 }
402
403 protected function popState()
404 {
405 if (0 === count($this->states)) {
406 throw new Exception('Cannot pop state without a previous state');
407 }
408
409 $this->state = array_pop($this->states);
410 }
411 }
412