1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
|
<?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.
*/
namespace ElementorDeps\Twig;
use ElementorDeps\Twig\Error\SyntaxError;
/**
* @author Fabien Potencier <[email protected]>
*/
class Lexer
{
private $isInitialized = \false;
private $tokens;
private $code;
private $cursor;
private $lineno;
private $end;
private $state;
private $states;
private $brackets;
private $env;
private $source;
private $options;
private $regexes;
private $position;
private $positions;
private $currentVarBlockLine;
public const STATE_DATA = 0;
public const STATE_BLOCK = 1;
public const STATE_VAR = 2;
public const STATE_STRING = 3;
public const STATE_INTERPOLATION = 4;
public const REGEX_NAME = '/[a-zA-Z_\\x7f-\\xff][a-zA-Z0-9_\\x7f-\\xff]*/A';
public const REGEX_NUMBER = '/[0-9]+(?:\\.[0-9]+)?([Ee][\\+\\-][0-9]+)?/A';
public const REGEX_STRING = '/"([^#"\\\\]*(?:\\\\.[^#"\\\\]*)*)"|\'([^\'\\\\]*(?:\\\\.[^\'\\\\]*)*)\'/As';
public const REGEX_DQ_STRING_DELIM = '/"/A';
public const REGEX_DQ_STRING_PART = '/[^#"\\\\]*(?:(?:\\\\.|#(?!\\{))[^#"\\\\]*)*/As';
public const PUNCTUATION = '()[]{}?:.,|';
public function __construct(Environment $env, array $options = [])
{
$this->env = $env;
$this->options = \array_merge(['tag_comment' => ['{#', '#}'], 'tag_block' => ['{%', '%}'], 'tag_variable' => ['{{', '}}'], 'whitespace_trim' => '-', 'whitespace_line_trim' => '~', 'whitespace_line_chars' => ' \\t\\0\\x0B', 'interpolation' => ['#{', '}']], $options);
}
private function initialize()
{
if ($this->isInitialized) {
return;
}
// when PHP 7.3 is the min version, we will be able to remove the '#' part in preg_quote as it's part of the default
$this->regexes = [
// }}
'lex_var' => '{
\\s*
(?:' . \preg_quote($this->options['whitespace_trim'] . $this->options['tag_variable'][1], '#') . '\\s*' . '|' . \preg_quote($this->options['whitespace_line_trim'] . $this->options['tag_variable'][1], '#') . '[' . $this->options['whitespace_line_chars'] . ']*' . '|' . \preg_quote($this->options['tag_variable'][1], '#') . ')
}Ax',
// %}
'lex_block' => '{
\\s*
(?:' . \preg_quote($this->options['whitespace_trim'] . $this->options['tag_block'][1], '#') . '\\s*\\n?' . '|' . \preg_quote($this->options['whitespace_line_trim'] . $this->options['tag_block'][1], '#') . '[' . $this->options['whitespace_line_chars'] . ']*' . '|' . \preg_quote($this->options['tag_block'][1], '#') . '\\n?' . ')
}Ax',
// {% endverbatim %}
'lex_raw_data' => '{' . \preg_quote($this->options['tag_block'][0], '#') . '(' . $this->options['whitespace_trim'] . '|' . $this->options['whitespace_line_trim'] . ')?\\s*endverbatim\\s*' . '(?:' . \preg_quote($this->options['whitespace_trim'] . $this->options['tag_block'][1], '#') . '\\s*' . '|' . \preg_quote($this->options['whitespace_line_trim'] . $this->options['tag_block'][1], '#') . '[' . $this->options['whitespace_line_chars'] . ']*' . '|' . \preg_quote($this->options['tag_block'][1], '#') . ')
}sx',
'operator' => $this->getOperatorRegex(),
// #}
'lex_comment' => '{
(?:' . \preg_quote($this->options['whitespace_trim'] . $this->options['tag_comment'][1], '#') . '\\s*\\n?' . '|' . \preg_quote($this->options['whitespace_line_trim'] . $this->options['tag_comment'][1], '#') . '[' . $this->options['whitespace_line_chars'] . ']*' . '|' . \preg_quote($this->options['tag_comment'][1], '#') . '\\n?' . ')
}sx',
// verbatim %}
'lex_block_raw' => '{
\\s*verbatim\\s*
(?:' . \preg_quote($this->options['whitespace_trim'] . $this->options['tag_block'][1], '#') . '\\s*' . '|' . \preg_quote($this->options['whitespace_line_trim'] . $this->options['tag_block'][1], '#') . '[' . $this->options['whitespace_line_chars'] . ']*' . '|' . \preg_quote($this->options['tag_block'][1], '#') . ')
}Asx',
'lex_block_line' => '{\\s*line\\s+(\\d+)\\s*' . \preg_quote($this->options['tag_block'][1], '#') . '}As',
// {{ or {% or {#
'lex_tokens_start' => '{
(' . \preg_quote($this->options['tag_variable'][0], '#') . '|' . \preg_quote($this->options['tag_block'][0], '#') . '|' . \preg_quote($this->options['tag_comment'][0], '#') . ')(' . \preg_quote($this->options['whitespace_trim'], '#') . '|' . \preg_quote($this->options['whitespace_line_trim'], '#') . ')?
}sx',
'interpolation_start' => '{' . \preg_quote($this->options['interpolation'][0], '#') . '\\s*}A',
'interpolation_end' => '{\\s*' . \preg_quote($this->options['interpolation'][1], '#') . '}A',
];
$this->isInitialized = \true;
}
public function tokenize(Source $source) : TokenStream
{
$this->initialize();
$this->source = $source;
$this->code = \str_replace(["\r\n", "\r"], "\n", $source->getCode());
$this->cursor = 0;
$this->lineno = 1;
$this->end = \strlen($this->code);
$this->tokens = [];
$this->state = self::STATE_DATA;
$this->states = [];
$this->brackets = [];
$this->position = -1;
// find all token starts in one go
\preg_match_all($this->regexes['lex_tokens_start'], $this->code, $matches, \PREG_OFFSET_CAPTURE);
$this->positions = $matches;
while ($this->cursor < $this->end) {
// dispatch to the lexing functions depending
// on the current state
switch ($this->state) {
case self::STATE_DATA:
$this->lexData();
break;
case self::STATE_BLOCK:
$this->lexBlock();
break;
case self::STATE_VAR:
$this->lexVar();
break;
case self::STATE_STRING:
$this->lexString();
break;
case self::STATE_INTERPOLATION:
$this->lexInterpolation();
break;
}
}
$this->pushToken(
/* Token::EOF_TYPE */
-1
);
if (!empty($this->brackets)) {
[$expect, $lineno] = \array_pop($this->brackets);
throw new SyntaxError(\sprintf('Unclosed "%s".', $expect), $lineno, $this->source);
}
return new TokenStream($this->tokens, $this->source);
}
private function lexData() : void
{
// if no matches are left we return the rest of the template as simple text token
if ($this->position == \count($this->positions[0]) - 1) {
$this->pushToken(
/* Token::TEXT_TYPE */
0,
\substr($this->code, $this->cursor)
);
$this->cursor = $this->end;
return;
}
// Find the first token after the current cursor
$position = $this->positions[0][++$this->position];
while ($position[1] < $this->cursor) {
if ($this->position == \count($this->positions[0]) - 1) {
return;
}
$position = $this->positions[0][++$this->position];
}
// push the template text first
$text = $textContent = \substr($this->code, $this->cursor, $position[1] - $this->cursor);
// trim?
if (isset($this->positions[2][$this->position][0])) {
if ($this->options['whitespace_trim'] === $this->positions[2][$this->position][0]) {
// whitespace_trim detected ({%-, {{- or {#-)
$text = \rtrim($text);
} elseif ($this->options['whitespace_line_trim'] === $this->positions[2][$this->position][0]) {
// whitespace_line_trim detected ({%~, {{~ or {#~)
// don't trim \r and \n
$text = \rtrim($text, " \t\x00\v");
}
}
$this->pushToken(
/* Token::TEXT_TYPE */
0,
$text
);
$this->moveCursor($textContent . $position[0]);
switch ($this->positions[1][$this->position][0]) {
case $this->options['tag_comment'][0]:
$this->lexComment();
break;
case $this->options['tag_block'][0]:
// raw data?
if (\preg_match($this->regexes['lex_block_raw'], $this->code, $match, 0, $this->cursor)) {
$this->moveCursor($match[0]);
$this->lexRawData();
// {% line \d+ %}
} elseif (\preg_match($this->regexes['lex_block_line'], $this->code, $match, 0, $this->cursor)) {
$this->moveCursor($match[0]);
$this->lineno = (int) $match[1];
} else {
$this->pushToken(
/* Token::BLOCK_START_TYPE */
1
);
$this->pushState(self::STATE_BLOCK);
$this->currentVarBlockLine = $this->lineno;
}
break;
case $this->options['tag_variable'][0]:
$this->pushToken(
/* Token::VAR_START_TYPE */
2
);
$this->pushState(self::STATE_VAR);
$this->currentVarBlockLine = $this->lineno;
break;
}
}
private function lexBlock() : void
{
if (empty($this->brackets) && \preg_match($this->regexes['lex_block'], $this->code, $match, 0, $this->cursor)) {
$this->pushToken(
/* Token::BLOCK_END_TYPE */
3
);
$this->moveCursor($match[0]);
$this->popState();
} else {
$this->lexExpression();
}
}
private function lexVar() : void
{
if (empty($this->brackets) && \preg_match($this->regexes['lex_var'], $this->code, $match, 0, $this->cursor)) {
$this->pushToken(
/* Token::VAR_END_TYPE */
4
);
$this->moveCursor($match[0]);
$this->popState();
} else {
$this->lexExpression();
}
}
private function lexExpression() : void
{
// whitespace
if (\preg_match('/\\s+/A', $this->code, $match, 0, $this->cursor)) {
$this->moveCursor($match[0]);
if ($this->cursor >= $this->end) {
throw new SyntaxError(\sprintf('Unclosed "%s".', self::STATE_BLOCK === $this->state ? 'block' : 'variable'), $this->currentVarBlockLine, $this->source);
}
}
// spread operator
if ('.' === $this->code[$this->cursor] && $this->cursor + 2 < $this->end && '.' === $this->code[$this->cursor + 1] && '.' === $this->code[$this->cursor + 2]) {
$this->pushToken(Token::SPREAD_TYPE, '...');
$this->moveCursor('...');
} elseif ('=' === $this->code[$this->cursor] && $this->cursor + 1 < $this->end && '>' === $this->code[$this->cursor + 1]) {
$this->pushToken(Token::ARROW_TYPE, '=>');
$this->moveCursor('=>');
} elseif (\preg_match($this->regexes['operator'], $this->code, $match, 0, $this->cursor)) {
$this->pushToken(
/* Token::OPERATOR_TYPE */
8,
\preg_replace('/\\s+/', ' ', $match[0])
);
$this->moveCursor($match[0]);
} elseif (\preg_match(self::REGEX_NAME, $this->code, $match, 0, $this->cursor)) {
$this->pushToken(
/* Token::NAME_TYPE */
5,
$match[0]
);
$this->moveCursor($match[0]);
} elseif (\preg_match(self::REGEX_NUMBER, $this->code, $match, 0, $this->cursor)) {
$number = (float) $match[0];
// floats
if (\ctype_digit($match[0]) && $number <= \PHP_INT_MAX) {
$number = (int) $match[0];
// integers lower than the maximum
}
$this->pushToken(
/* Token::NUMBER_TYPE */
6,
$number
);
$this->moveCursor($match[0]);
} elseif (\str_contains(self::PUNCTUATION, $this->code[$this->cursor])) {
// opening bracket
if (\str_contains('([{', $this->code[$this->cursor])) {
$this->brackets[] = [$this->code[$this->cursor], $this->lineno];
} elseif (\str_contains(')]}', $this->code[$this->cursor])) {
if (empty($this->brackets)) {
throw new SyntaxError(\sprintf('Unexpected "%s".', $this->code[$this->cursor]), $this->lineno, $this->source);
}
[$expect, $lineno] = \array_pop($this->brackets);
if ($this->code[$this->cursor] != \strtr($expect, '([{', ')]}')) {
throw new SyntaxError(\sprintf('Unclosed "%s".', $expect), $lineno, $this->source);
}
}
$this->pushToken(
/* Token::PUNCTUATION_TYPE */
9,
$this->code[$this->cursor]
);
++$this->cursor;
} elseif (\preg_match(self::REGEX_STRING, $this->code, $match, 0, $this->cursor)) {
$this->pushToken(
/* Token::STRING_TYPE */
7,
\stripcslashes(\substr($match[0], 1, -1))
);
$this->moveCursor($match[0]);
} elseif (\preg_match(self::REGEX_DQ_STRING_DELIM, $this->code, $match, 0, $this->cursor)) {
$this->brackets[] = ['"', $this->lineno];
$this->pushState(self::STATE_STRING);
$this->moveCursor($match[0]);
} else {
throw new SyntaxError(\sprintf('Unexpected character "%s".', $this->code[$this->cursor]), $this->lineno, $this->source);
}
}
private function lexRawData() : void
{
if (!\preg_match($this->regexes['lex_raw_data'], $this->code, $match, \PREG_OFFSET_CAPTURE, $this->cursor)) {
throw new SyntaxError('Unexpected end of file: Unclosed "verbatim" block.', $this->lineno, $this->source);
}
$text = \substr($this->code, $this->cursor, $match[0][1] - $this->cursor);
$this->moveCursor($text . $match[0][0]);
// trim?
if (isset($match[1][0])) {
if ($this->options['whitespace_trim'] === $match[1][0]) {
// whitespace_trim detected ({%-, {{- or {#-)
$text = \rtrim($text);
} else {
// whitespace_line_trim detected ({%~, {{~ or {#~)
// don't trim \r and \n
$text = \rtrim($text, " \t\x00\v");
}
}
$this->pushToken(
/* Token::TEXT_TYPE */
0,
$text
);
}
private function lexComment() : void
{
if (!\preg_match($this->regexes['lex_comment'], $this->code, $match, \PREG_OFFSET_CAPTURE, $this->cursor)) {
throw new SyntaxError('Unclosed comment.', $this->lineno, $this->source);
}
$this->moveCursor(\substr($this->code, $this->cursor, $match[0][1] - $this->cursor) . $match[0][0]);
}
private function lexString() : void
{
if (\preg_match($this->regexes['interpolation_start'], $this->code, $match, 0, $this->cursor)) {
$this->brackets[] = [$this->options['interpolation'][0], $this->lineno];
$this->pushToken(
/* Token::INTERPOLATION_START_TYPE */
10
);
$this->moveCursor($match[0]);
$this->pushState(self::STATE_INTERPOLATION);
} elseif (\preg_match(self::REGEX_DQ_STRING_PART, $this->code, $match, 0, $this->cursor) && '' !== $match[0]) {
$this->pushToken(
/* Token::STRING_TYPE */
7,
\stripcslashes($match[0])
);
$this->moveCursor($match[0]);
} elseif (\preg_match(self::REGEX_DQ_STRING_DELIM, $this->code, $match, 0, $this->cursor)) {
[$expect, $lineno] = \array_pop($this->brackets);
if ('"' != $this->code[$this->cursor]) {
throw new SyntaxError(\sprintf('Unclosed "%s".', $expect), $lineno, $this->source);
}
$this->popState();
++$this->cursor;
} else {
// unlexable
throw new SyntaxError(\sprintf('Unexpected character "%s".', $this->code[$this->cursor]), $this->lineno, $this->source);
}
}
private function lexInterpolation() : void
{
$bracket = \end($this->brackets);
if ($this->options['interpolation'][0] === $bracket[0] && \preg_match($this->regexes['interpolation_end'], $this->code, $match, 0, $this->cursor)) {
\array_pop($this->brackets);
$this->pushToken(
/* Token::INTERPOLATION_END_TYPE */
11
);
$this->moveCursor($match[0]);
$this->popState();
} else {
$this->lexExpression();
}
}
private function pushToken($type, $value = '') : void
{
// do not push empty text tokens
if (0 === $type && '' === $value) {
return;
}
$this->tokens[] = new Token($type, $value, $this->lineno);
}
private function moveCursor($text) : void
{
$this->cursor += \strlen($text);
$this->lineno += \substr_count($text, "\n");
}
private function getOperatorRegex() : string
{
$operators = \array_merge(['='], \array_keys($this->env->getUnaryOperators()), \array_keys($this->env->getBinaryOperators()));
$operators = \array_combine($operators, \array_map('strlen', $operators));
\arsort($operators);
$regex = [];
foreach ($operators as $operator => $length) {
// an operator that ends with a character must be followed by
// a whitespace, a parenthesis, an opening map [ or sequence {
$r = \preg_quote($operator, '/');
if (\ctype_alpha($operator[$length - 1])) {
$r .= '(?=[\\s()\\[{])';
}
// an operator that begins with a character must not have a dot or pipe before
if (\ctype_alpha($operator[0])) {
$r = '(?<![\\.\\|])' . $r;
}
// an operator with a space can be any amount of whitespaces
$r = \preg_replace('/\\s+/', '\\s+', $r);
$regex[] = $r;
}
return '/' . \implode('|', $regex) . '/A';
}
private function pushState($state) : void
{
$this->states[] = $this->state;
$this->state = $state;
}
private function popState() : void
{
if (0 === \count($this->states)) {
throw new \LogicException('Cannot pop state without a previous state.');
}
$this->state = \array_pop($this->states);
}
}
|