Repository navigation
Expand file tree
/
Copy pathCSS.php
More file actions
674 lines (565 loc) · 21.7 KB
/
Copy pathCSS.php
File metadata and controls
674 lines (565 loc) · 21.7 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
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
<?php
namespace MatthiasMullie\Minify;
use MatthiasMullie\Minify\Exceptions\FileImportException;
use MatthiasMullie\PathConverter\Converter;
/**
* CSS minifier.
*
* Please report bugs on https://github.com/matthiasmullie/minify/issues
*
* @author Matthias Mullie <minify@mullie.eu>
* @author Tijs Verkoyen <minify@verkoyen.eu>
* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
* @license MIT License
*/
class CSS extends Minify
{
/**
* @var int
*/
protected $maxImportSize = 5;
/**
* @var string[]
*/
protected $importExtensions = array(
'gif' => 'data:image/gif',
'png' => 'data:image/png',
'jpe' => 'data:image/jpeg',
'jpg' => 'data:image/jpeg',
'jpeg' => 'data:image/jpeg',
'svg' => 'data:image/svg+xml',
'woff' => 'data:application/x-font-woff',
'tif' => 'image/tiff',
'tiff' => 'image/tiff',
'xbm' => 'image/x-xbitmap',
);
/**
* Set the maximum size if files to be imported.
*
* Files larger than this size (in kB) will not be imported into the CSS.
* Importing files into the CSS as data-uri will save you some connections,
* but we should only import relatively small decorative images so that our
* CSS file doesn't get too bulky.
*
* @param int $size Size in kB
*/
public function setMaxImportSize($size)
{
$this->maxImportSize = $size;
}
/**
* Set the type of extensions to be imported into the CSS (to save network
* connections).
* Keys of the array should be the file extensions & respective values
* should be the data type.
*
* @param string[] $extensions Array of file extensions
*/
public function setImportExtensions(array $extensions)
{
$this->importExtensions = $extensions;
}
/**
* Move any import statements to the top.
*
* @param string $content Nearly finished CSS content
*
* @return string
*/
protected function moveImportsToTop($content)
{
if (preg_match_all('/@import[^;]+;/', $content, $matches)) {
// remove from content
foreach ($matches[0] as $import) {
$content = str_replace($import, '', $content);
}
// add to top
$content = implode('', $matches[0]).$content;
}
return $content;
}
/**
* Combine CSS from import statements.
*
* @import's will be loaded and their content merged into the original file,
* to save HTTP requests.
*
* @param string $source The file to combine imports for
* @param string $content The CSS content to combine imports for
* @param string[] $parents Parent paths, for circular reference checks
*
* @return string
*
* @throws FileImportException
*/
protected function combineImports($source, $content, $parents)
{
$importRegexes = array(
// @import url(xxx)
'/
# import statement
@import
# whitespace
\s+
# open url()
url\(
# (optional) open path enclosure
(?P<quotes>["\']?)
# fetch path
(?P<path>
# do not fetch data uris or external sources
(?!(
["\']?
(data|https?):
))
.+?
)
# (optional) close path enclosure
(?P=quotes)
# close url()
\)
# (optional) trailing whitespace
\s*
# (optional) media statement(s)
(?P<media>[^;]*)
# (optional) trailing whitespace
\s*
# (optional) closing semi-colon
;?
/ix',
// @import 'xxx'
'/
# import statement
@import
# whitespace
\s+
# open path enclosure
(?P<quotes>["\'])
# fetch path
(?P<path>
# do not fetch data uris or external sources
(?!(
["\']?
(data|https?):
))
.+?
)
# close path enclosure
(?P=quotes)
# (optional) trailing whitespace
\s*
# (optional) media statement(s)
(?P<media>[^;]*)
# (optional) trailing whitespace
\s*
# (optional) closing semi-colon
;?
/ix',
);
// find all relative imports in css
$matches = array();
foreach ($importRegexes as $importRegex) {
if (preg_match_all($importRegex, $content, $regexMatches, PREG_SET_ORDER)) {
$matches = array_merge($matches, $regexMatches);
}
}
$search = array();
$replace = array();
// loop the matches
foreach ($matches as $match) {
// get the path for the file that will be imported
$importPath = dirname($source).'/'.$match['path'];
// only replace the import with the content if we can grab the
// content of the file
if ($this->canImportFile($importPath)) {
// check if current file was not imported previously in the same
// import chain.
if (in_array($importPath, $parents)) {
throw new FileImportException('Failed to import file "'.$importPath.'": circular reference detected.');
}
// grab referenced file & minify it (which may include importing
// yet other @import statements recursively)
$minifier = new static($importPath);
$importContent = $minifier->execute($source, $parents);
// check if this is only valid for certain media
if (!empty($match['media'])) {
$importContent = '@media '.$match['media'].'{'.$importContent.'}';
}
// add to replacement array
$search[] = $match[0];
$replace[] = $importContent;
}
}
// replace the import statements
$content = str_replace($search, $replace, $content);
return $content;
}
/**
* Import files into the CSS, base64-ized.
*
* @url(image.jpg) images will be loaded and their content merged into the
* original file, to save HTTP requests.
*
* @param string $source The file to import files for
* @param string $content The CSS content to import files for
*
* @return string
*/
protected function importFiles($source, $content)
{
$extensions = array_keys($this->importExtensions);
$regex = '/url\((["\']?)((?!["\']?data:).*?\.('.implode('|', $extensions).'))\\1\)/i';
if ($extensions && preg_match_all($regex, $content, $matches, PREG_SET_ORDER)) {
$search = array();
$replace = array();
// loop the matches
foreach ($matches as $match) {
// get the path for the file that will be imported
$path = $match[2];
$path = dirname($source).'/'.$path;
$extension = $match[3];
// only replace the import with the content if we're able to get
// the content of the file, and it's relatively small
if ($this->canImportFile($path) && $this->canImportBySize($path)) {
// grab content && base64-ize
$importContent = $this->load($path);
$importContent = base64_encode($importContent);
// build replacement
$search[] = $match[0];
$replace[] = 'url('.$this->importExtensions[$extension].';base64,'.$importContent.')';
}
}
// replace the import statements
$content = str_replace($search, $replace, $content);
}
return $content;
}
/**
* Minify the data.
* Perform CSS optimizations.
*
* @param string[optional] $path Path to write the data to
* @param string[] $parents Parent paths, for circular reference checks
*
* @return string The minified data
*/
public function execute($path = null, $parents = array())
{
$content = '';
// loop css data (raw data and files)
foreach
8000
($this->data as $source => $css) {
/*
* Let's first take out strings & comments, since we can't just remove
* whitespace anywhere. If whitespace occurs inside a string, we should
* leave it alone. E.g.:
* p { content: "a test" }
*/
$this->extractStrings();
$this->stripComments();
$css = $this->replace($css);
$css = $this->stripWhitespace($css);
$css = $this->shortenHex($css);
$css = $this->shortenZeroes($css);
$css = $this->shortenFontWeights($css);
$css = $this->stripEmptyTags($css);
// restore the string we've extracted earlier
$css = $this->restoreExtractedData($css);
$source = is_int($source) ? '' : $source;
$parents = $source ? array_merge($parents, array($source)) : $parents;
$css = $this->combineImports($source, $css, $parents);
$css = $this->importFiles($source, $css);
/*
* If we'll save to a new path, we'll have to fix the relative paths
* to be relative no longer to the source file, but to the new path.
* If we don't write to a file, fall back to same path so no
* conversion happens (because we still want it to go through most
* of the move code...)
*/
$converter = new Converter($source, $path ?: $source);
$css = $this->move($converter, $css);
// combine css
$content .= $css;
}
$content = $this->moveImportsToTop($content);
return $content;
}
/**
* Moving a css file should update all relative urls.
* Relative references (e.g. ../images/image.gif) in a certain css file,
* will have to be updated when a file is being saved at another location
* (e.g. ../../images/image.gif, if the new CSS file is 1 folder deeper).
*
* @param Converter $converter Relative path converter
* @param string $content The CSS content to update relative urls for
*
* @return string
*/
protected function move(Converter $converter, $content)
{
/*
* Relative path references will usually be enclosed by url(). @import
* is an exception, where url() is not necessary around the path (but is
* allowed).
* This *could* be 1 regular expression, where both regular expressions
* in this array are on different sides of a |. But we're using named
* patterns in both regexes, the same name on both regexes. This is only
* possible with a (?J) modifier, but that only works after a fairly
* recent PCRE version. That's why I'm doing 2 separate regular
* expressions & combining the matches after executing of both.
*/
$relativeRegexes = array(
// url(xxx)
'/
# open url()
url\(
\s*
# open path enclosure
(?P<quotes>["\'])?
# fetch path
(?P<path>
# do not fetch data uris or external sources
(?!(
\s?
["\']?
(data|https?):
))
.+?
)
# close path enclosure
(?(quotes)(?P=quotes))
\s*
# close url()
\)
/ix',
// @import "xxx"
'/
# import statement
@import
# whitespace
\s+
# we don\'t have to check for @import url(), because the
# condition above will already catch these
# open path enclosure
(?P<quotes>["\'])
# fetch path
(?P<path>
# do not fetch data uris or external sources
(?!(
["\']?
(data|https?):
))
.+?
)
# close path enclosure
(?P=quotes)
/ix',
);
// find all relative urls in css
$matches = array();
foreach ($relativeRegexes as $relativeRegex) {
if (preg_match_all($relativeRegex, $content, $regexMatches, PREG_SET_ORDER)) {
$matches = array_merge($matches, $regexMatches);
}
}
$search = array();
$replace = array();
// loop all urls
foreach ($matches as $match) {
// determine if it's a url() or an @import match
$type = (strpos($match[0], '@import') === 0 ? 'import' : 'url');
// attempting to interpret GET-params makes no sense, so let's discard them for awhile
$params = strrchr($match['path'], '?');
$url = $params ? substr($match['path'], 0, -strlen($params)) : $match['path'];
// fix relative url
$url = $converter->convert($url);
// now that the path has been converted, re-apply GET-params
$url .= $params;
// build replacement
$search[] = $match[0];
if ($type == 'url') {
$replace[] = 'url('.$url.')';
} elseif ($type == 'import') {
$replace[] = '@import "'.$url.'"';
}
}
// replace urls
$content = str_replace($search, $replace, $content);
return $content;
}
/**
* Shorthand hex color codes.
* #FF0000 -> #F00.
*
* @param string $content The CSS content to shorten the hex color codes for
*
* @return string
*/
protected function shortenHex($content)
{
$content = preg_replace('/(?<=[: ])#([0-9a-z])\\1([0-9a-z])\\2([0-9a-z])\\3(?=[; }])/i', '#$1$2$3', $content);
// we can shorten some even more by replacing them with their color name
$colors = array(
'#F0FFFF' => 'azure',
'#F5F5DC' => 'beige',
'#A52A2A' => 'brown',
'#FF7F50' => 'coral',
'#FFD700' => 'gold',
'#808080' => 'gray',
'#008000' => 'green',
'#4B0082' => 'indigo',
'#FFFFF0' => 'ivory',
'#F0E68C' => 'khaki',
'#FAF0E6' => 'linen',
'#800000' => 'maroon',
'#000080' => 'navy',
'#808000' => 'olive',
'#CD853F' => 'peru',
'#FFC0CB' => 'pink',
'#DDA0DD' => 'plum',
'#800080' => 'purple',
'#F00' => 'red',
'#FA8072' => 'salmon',
'#A0522D' => 'sienna',
'#C0C0C0' => 'silver',
'#FFFAFA' => 'snow',
'#D2B48C' => 'tan',
'#FF6347' => 'tomato',
'#EE82EE' => 'violet',
'#F5DEB3' => 'wheat',
);
return preg_replace_callback(
'/(?<=[: ])('.implode(array_keys($colors), '|').')(?=[; }])/i',
function ($match) use ($colors) {
return $colors[strtoupper($match[0])];
},
$content
);
}
/**
* Shorten CSS font weights.
*
* @param string $content The CSS content to shorten the font weights for
*
* @return string
*/
protected function shortenFontWeights($content)
{
$weights = array(
'normal' => 400,
'bold' => 700,
);
$callback = function ($match) use ($weights) {
return $match[1].$weights[$match[2]];
};
return preg_replace_callback('/(font-weight\s*:\s*)('.implode('|', array_keys($weights)).')(?=[;}])/', $callback, $content);
}
/**
* Shorthand 0 values to plain 0, instead of e.g. -0em.
*
* @param string $content The CSS content to shorten the zero values for
*
* @return string
*/
protected function shortenZeroes($content)
{
// reusable bits of code throughout these regexes:
// before & after are used to make sure we don't match lose unintended
// 0-like values (e.g. in #000, or in http://url/1.0)
// units can be stripped from 0 values, or used to recognize non 0
// values (where wa may be able to strip a .0 suffix)
$before = '(?<=[:(, ])';
$after = '(?=[ ,);}])';
$units = '(em|ex|%|px|cm|mm|in|pt|pc|ch|rem|vh|vw|vmin|vmax|vm)';
// strip units after zeroes (0px -> 0)
// NOTE: it should be safe to remove all units for a 0 value, but in
// practice, Webkit (especially Safari) seems to stumble over at least
// 0%, potentially other units as well. Only stripping 'px' for now.
// @see https://github.com/matthiasmullie/minify/issues/60
$content = preg_replace('/'.$before.'(-?0*(\.0+)?)(?<=0)px'.$after.'/', '\\1', $content);
// strip 0-digits (.0 -> 0)
$content = preg_replace('/'.$before.'\.0+'.$units.'?'.$after.'/', '0\\1', $content);
// strip trailing 0: 50.10 -> 50.1, 50.10px -> 50.1px
$content = preg_replace('/'.$before.'(-?[0-9]+\.[0-9]+)0+'.$units.'?'.$after.'/', '\\1\\2', $content);
// strip trailing 0: 50.00 -> 50, 50.00px -> 50px
$content = preg_replace('/'.$before.'(-?[0-9]+)\.0+'.$units.'?'.$after.'/', '\\1\\2', $content);
// strip leading 0: 0.1 -> .1, 01.1 -> 1.1
$content = preg_replace('/'.$before.'(-?)0+([0-9]*\.[0-9]+)'.$units.'?'.$after.'/', '\\1\\2\\3', $content);
// strip negative zeroes (-0 -> 0) & truncate zeroes (00 -> 0)
$content = preg_replace('/'.$before.'-?0+'.$units.'?'.$after.'/', '0\\1', $content);
// remove zeroes where they make no sense in calc: e.g. calc(100px - 0)
// the 0 doesn't have any effect, and this isn't even valid without unit
// strip all `+ 0` or `- 0` occurrences: calc(10% + 0) -> calc(10%)
// looped because there may be multiple 0s inside 1 group of parentheses
do {
$previous = $content;
$content = preg_replace('/\(([^\(\)]+)\s+[\+\-]\s+0(\s+[^\(\)]+)?\)/', '(\\1\\2)', $content);
} while ($content !== $previous);
// strip all `0 +` occurrences: calc(0 + 10%) -> calc(10%)
$content = preg_replace('/\(\s*0\s+\+\s+([^\(\)]+)\)/', '(\\1)', $content);
// strip all `0 -` occurrences: calc(0 - 10%) -> calc(-10%)
$content = preg_replace('/\(\s*0\s+\-\s+([^\(\)]+)\)/', '(-\\1)', $content);
// I'm not going to attempt to optimize away `x * 0` instances:
// it's dumb enough code already that it likely won't occur, and it's
// too complex to do right (order of operations would have to be
// respected etc)
// what I cared about most here was fixing incorrectly truncated units
return $content;
}
/**
* Strip comments from source code.
*
* @param string $content
*
* @return string
*/
protected function stripEmptyTags($content)
{
return preg_replace('/(^|\}|;)[^\{\};]+\{\s*\}/', '\\1', $content);
}
/**
* Strip comments from source code.
*/
protected function stripComments()
{
$this->registerPattern('/\/\*.*?\*\//s', '');
}
/**
* Strip whitespace.
*
* @param string $content The CSS content to strip the whitespace for
*
* @return string
*/
protected function stripWhitespace($content)
{
// remove leading & trailing whitespace
$content = preg_replace('/^\s*/m', '', $content);
$content = preg_replace('/\s*$/m', '', $content);
// replace newlines with a single space
$content = preg_replace('/\s+/', ' ', $content);
// remove whitespace around meta characters
// inspired by stackoverflow.com/questions/15195750/minify-compress-css-with-regex
$content = preg_replace('/\s*([\*$~^|]?+=|[{};,>~]|!important\b)\s*/', '$1', $content);
$content = preg_replace('/([\[(:])\s+/', '$1', $content);
$content = preg_replace('/\s+([\]\)])/', '$1', $content);
$content = preg_replace('/\s+(:)(?![^\}]*\{)/', '$1', $content);
// whitespace around + and - can only be stripped in selectors, like
// :nth-child(3+2n), not in things like calc(3px + 2px) or shorthands
// like 3px -2px
$content = preg_replace('/\s*([+-])\s*(?=[^}]*{)/', '$1', $content);
// remove semicolon/whitespace followed by closing bracket
$content = str_replace(';}', '}', $content);
return trim($content);
}
/**
* Check if file is small enough to be imported.
*
* @param string $path The path to the file
*
* @return bool
*/
protected function canImportBySize($path)
{
return ($size = @filesize($path)) && $size <= $this->maxImportSize * 1024;
}
}