Repository navigation
Expand file tree
/
Copy pathMinify.php
More file actions
505 lines (444 loc) · 16.1 KB
/
Copy pathMinify.php
File metadata and controls
505 lines (444 loc) · 16.1 KB
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
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
<?php
/**
* Abstract minifier class
*
* Please report bugs on https://github.com/matthiasmullie/minify/issues
*
* @author Matthias Mullie <minify@mullie.eu>
* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
* @license MIT License
*/
namespace MatthiasMullie\Minify;
use MatthiasMullie\Minify\Exceptions\IOException;
use Psr\Cache\CacheItemInterface;
/**
* Abstract minifier class.
*
* Please report bugs on https://github.com/matthiasmullie/minify/issues
*
* @package Minify
* @author Matthias Mullie <minify@mullie.eu>
* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
* @license MIT License
*/
abstract class Minify
{
/**
* The data to be minified.
*
* @var string[]
*/
protected $data = array();
/**
* Array of patterns to match.
*
* @var string[]
*/
protected $patterns = array();
/**
* This array will hold content of strings and regular expressions that have
* been extracted from the JS source code, so we can reliably match "code",
* without having to worry about potential "code-like" characters inside.
*
* @var string[]
*/
public $extracted = array();
/**
* Init the minify class - optionally, code may be passed along already.
*/
public function __construct(/* $data = null, ... */)
{
// it's possible to add the source through the constructor as well ;)
if (func_num_args()) {
call_user_func_array(array($this, 'add'), func_get_args());
}
}
/**
* Add a file or straight-up code to be minified.
*
* @param string|string[] $data
*
* @return static
*/
public function add($data /* $data = null, ... */)
{
// bogus "usage" of parameter $data: scrutinizer warns this variable is
// not used (we're using func_get_args instead to support overloading),
// but it still needs to be defined because it makes no sense to have
// this function without argument :)
$args = array($data) + func_get_args();
// this method can be overloaded
foreach ($args as $data) {
if (is_array($data)) {
call_user_func_array(array($this, 'add'), $data);
continue;
}
// redefine var
$data = (string) $data;
// load data
$value = $this->load($data);
$key = ($data != $value) ? $data : count($this->data);
// replace CR linefeeds etc.
// @see https://github.com/matthiasmullie/minify/pull/139
$value = str_replace(array("\r\n", "\r"), "\n", $value);
// store data
$this->data[$key] = $value;
}
return $this;
}
/**
* Add a file to be minified.
*
* @param string|string[] $data
*
* @return static
*
* @throws IOException
*/
public function addFile($data /* $data = null, ... */)
{
// bogus "usage" of parameter $data: scrutinizer warns this variable is
// not used (we're using func_get_args instead to support overloading),
// but it still needs to be defined because it makes no sense to have
// this function without argument :)
$args = array($data) + func_get_args();
// this method can be overloaded
foreach ($args as $path) {
if (is_array($path)) {
call_user_func_array(array($this, 'addFile'), $path);
continue;
}
// redefine var
$path = (string) $path;
// check if we can read the file
if (!$this->canImportFile($path)) {
throw new IOException('The file "'.$path.'" could not be opened for reading. Check if PHP has enough permissions.');
}
$this->add($path);
}
return $this;
}
/**
* Minify the data & (optionally) saves it to a file.
*
* @param string[optional] $path Path to write the data to
*
* @return string The minified data
*/
public function minify($path = null)
{
$content = $this->execute($path);
// save to path
if ($path !== null) {
$this->save($content, $path);
}
return $content;
}
/**
* Minify & gzip the data & (optionally) saves it to a file.
*
* @param string[optional] $path Path to write the data to
* @param int[optional] $level Compression level, from 0 to 9
*
* @return string The minified & gzipped data
*/
public function gzip($path = null, $level = 9)
{
$content = $this->execute($path);
$content = gzencode($content, $level, FORCE_GZIP);
// save to path
if ($path !== null) {
$this->save($content, $path);
}
return $content;
}
/**
* Minify the data & write it to a CacheItemInterface object.
*
* @param CacheItemInterface $item Cache item to write the data to
*
* @return CacheItemInterface Cache item with the minifier data
*/
public function cache(CacheItemInterface $item)
{
$content = $this->execute();
$item->set($content);
return $item;
}
/**
* Minify the data.
*
* @param string[optional] $path Path to write the data to
*
* @return string The minified data
*/
abstract public function execute($path = null);
/**
* Load data.
*
* @param string $data Either a path to a file or the content itself
*
* @return string
*/
protected function load($data)
{
// check if the data is a file
if ($this->canImportFile($data)) {
$data = file_get_contents($data);
// strip BOM, if any
if (substr($data, 0, 3) == "\xef\xbb\xbf") {
$data = substr($data, 3);
}
}
return $data;
}
/**
* Save to file.
*
* @param string $content The minified data
* @param string $path The path to save the minified data to
*
* @throws IOException
*/
protected function save($content, $path)
{
$handler = $this->openFileForWriting($path);
$this->writeToFile($handler, $content);
@fclose($handler);
}
/**
* Register a pattern to execute against the source content.
*
* If $replacement is a string, it must be plain text. Placeholders like $1 or \2 don't work.
* If you need that functionality, use a callback instead.
*
* @param string $pattern PCRE pattern
* @param string|callable $replacement Replacement value for matched pattern
*/
protected function registerPattern($pattern, $replacement = '')
{
// study the pattern, we'll execute it more than once
$pattern .= 'S';
$this->patterns[] = array($pattern, $replacement);
}
/**
* We can't "just" run some regular expressions against JavaScript: it's a
* complex language. E.g. having an occurrence of // xyz would be a comment,
* unless it's used within a string. Of you could have something that looks
* like a 'string', but inside a comment.
* The only way to accurately replace these pieces is to traverse the JS one
* character at a time and try to find whatever starts first.
*
* @param string $content The content to replace patterns in
*
* @return string The (manipulated) content
*/
protected function replace($content)
{
$contentLength = strlen($content);
$output = '';
$processedOffset = 0;
$positions = array_fill(0, count($this->patterns), -1);
$matches = array();
while ($processedOffset < $contentLength) {
// find first match for all patterns
foreach ($this->patterns as $i => $pattern) {
list($pattern, $replacement) = $pattern;
// we can safely ignore patterns for positions we've unset earlier,
// because we know these won't show up anymore
if (array_key_exists($i, $positions) == false) {
continue;
}
// no need to re-run matches that are still in the part of the
// content that hasn't been processed
if ($positions[$i] >= $processedOffset) {
continue;
}
$match = null;
if (preg_match($pattern, $content, $match, PREG_OFFSET_CAPTURE, $processedOffset)) {
$matches[$i] = $match;
// we'll store the match position as well; that way, we
// don't have to redo all preg_matches after changing only
// the first (we'll still know where those others are)
$positions[$i] = $match[0][1];
} else {
// if the pattern couldn't be matched, there's no point in
// executing it again in later runs on this same content;
// ignore this one until we reach end of content
unset($matches[$i], $positions[$i]);
}
}
// no more matches to find: everything's been processed, break out
if (!$matches) {
// output the remaining content
$output .= substr($content, $processedOffset);
break;
}
// see which of the patterns actually found the first thing (we'll
// only want to execute that one, since we're unsure if what the
// other found was not inside what the first found)
$matchOffset = min($positions);
$firstPattern = array_search($matchOffset, $positions);
$match = $matches[$firstPattern];
// execute the pattern that matches earliest in the content string
list(, $replacement) = $this->patterns[$firstPattern];
// add the part of the input between $processedOffset and the first match;
// that content wasn't matched by anything
$output .= substr($content, $processedOffset, $matchOffset - $processedOffset);
// add the replacement for the match
$output .= $this->executeReplacement($replacement, $match);
// advance $processedOffset past the match
$processedOffset = $matchOffset + strlen($match[0][0]);
}
return $output;
}
/**
* If $replacement is a callback, execute it, passing in the match data.
* If it's a string, just pass it through.
*
* @param string|callable $replacement Replacement value
* @param array $match Match data, in PREG_OFFSET_CAPTURE form
*
* @return string
*/
protected function executeReplacement($replacement, $match)
{
if (!is_callable($replacement)) {
return $replacement;
}
// convert $match from the PREG_OFFSET_CAPTURE form to the form the callback expects
foreach ($match as &$matchItem) {
$matchItem = $matchItem[0];
}
return $replacement($match);
}
/**
* Strings are a pattern we need to match, in order to ignore potential
* code-like content inside them, but we just want all of the string
* content to remain untouched.
*
* This method will replace all string content with simple STRING#
* placeholder text, so we've rid all strings from characters that may be
* misinterpreted. Original string content will be saved in $this->extracted
* and after doing all other minifying, we can restore the original content
* via restoreStrings().
*
* @param string[optional] $chars
* @param string[optional] $placeholderPrefix
*/
protected function extractStrings($chars = '\'"', $placeholderPrefix = '')
{
// PHP only supports $this inside anonymous functions since 5.4
$minifier = $this;
$callback = function ($match) use ($minifier, $placeholderPrefix) {
// check the second index here, because the first always contains a quote
if ($match[2] === '') {
/*
* Empty strings need no placeholder; they can't be confused for
* anything else anyway.
* But we still needed to match them, for the extraction routine
* to skip over this particular string.
*/
return $match[0];
}
$count = count($minifier->extracted);
$placeholder = $match[1].$placeholderPrefix.$count.$match[1];
$minifier->extracted[$placeholder] = $match[1].$match[2].$match[1];
return $placeholder;
};
/*
* The \\ messiness explained:
* * Don't count ' or " as end-of-string if it's escaped (has backslash
* in front of it)
* * Unless... that backslash itself is escaped (another leading slash),
* in which case it's no longer escaping the ' or "
* * So there can be either no backslash, or an even number
* * multiply all of that times 4, to account for the escaping that has
* to be done to pass the backslash into the PHP string without it being
* considered as escape-char (times 2) and to get it in the regex,
* escaped (times 2)
*/
$this->registerPattern('/(['.$chars.'])(.*?(?<!\\\\)(\\\\\\\\)*+)\\1/s', $callback);
}
/**
* This method will restore all extracted data (strings, regexes) that were
* replaced with placeholder text in extract*(). The original content was
* saved in $this->extracted.
*
* @param string $content
*
* @return string
*/
protected function restoreExtractedData($content)
{
if (!$this->extracted) {
// nothing was extracted, nothing to restore
return $content;
}
$content = strtr($content, $this->extracted);
$this->extracted = array();
return $content;
}
/**
* Check if the path is a regular file and can be read.
*
* @param string $path
*
* @return bool
*/
protected function canImportFile($path)
{
$parsed = parse_url($path);
if (
// file is elsewhere
isset($parsed['host']) ||
// file responds to queries (may change, or need to bypass cache)
isset($parsed['query'])
) {
return false;
}
return strlen($path) < PHP_MAXPATHLEN && @is_file($path) && is_readable($path);
}
/**
* Attempts to open file specified by $path for writing.
*
* @param string $path The path to the file
*
* @return resource Specifier for the target file
*
* @throws IOException
*/
protected function openFileForWriting($path)
{
if ($path === '' || ($handler = @fopen($path, 'w')) === false) {
throw new IOException('The file "'.$path.'" could not be opened for writing. Check if PHP has enough permissions.');
}
return $handler;
}
/**
* Attempts to write $content to the file specified by $handler. $path is used for printing exceptions.
*
* @param resource $handler The resource to write to
* @param string $content The content to write
* @param string $path The path to the file (for exception printing only)
*
* @throws IOException
*/
protected function writeToFile($handler, $content, $path = '')
{
if (
!is_resource($handler) ||
($result = @fwrite($handler, $content)) === false ||
($result < strlen($content))
) {
throw new IOException('The file "'.$path.'" could not be written to. Check your disk space and file permissions.');
}
}
protected static function str_replace_first($search, $replace, $subject) {
$pos = strpos($subject, $search);
if ($pos !== false) {
return substr_replace($subject, $replace, $pos, strlen($search));
}
return $subject;
}
}