Completed
Push — master ( 4762ae...db7e52 )
by Matthias
01:09
created

CSS::extractCalcs()   A

Complexity

Conditions 5
Paths 1

Size

Total Lines 30

Duplication

Lines 0
Ratio 0 %

Importance

Changes 0
Metric Value
dl 0
loc 30
rs 9.1288
c 0
b 0
f 0
cc 5
nc 1
nop 0
1
<?php
2
/**
3
 * CSS Minifier
4
 *
5
 * Please report bugs on https://github.com/matthiasmullie/minify/issues
6
 *
7
 * @author Matthias Mullie <[email protected]>
8
 * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
9
 * @license MIT License
10
 */
11
12
namespace MatthiasMullie\Minify;
13
14
use MatthiasMullie\Minify\Exceptions\FileImportException;
15
use MatthiasMullie\PathConverter\ConverterInterface;
16
use MatthiasMullie\PathConverter\Converter;
17
18
/**
19
 * CSS minifier
20
 *
21
 * Please report bugs on https://github.com/matthiasmullie/minify/issues
22
 *
23
 * @package Minify
24
 * @author Matthias Mullie <[email protected]>
25
 * @author Tijs Verkoyen <[email protected]>
26
 * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
27
 * @license MIT License
28
 */
29
class CSS extends Minify
30
{
31
    /**
32
     * @var int maximum inport size in kB
33
     */
34
    protected $maxImportSize = 5;
35
36
    /**
37
     * @var string[] valid import extensions
38
     */
39
    protected $importExtensions = array(
40
        'gif' => 'data:image/gif',
41
        'png' => 'data:image/png',
42
        'jpe' => 'data:image/jpeg',
43
        'jpg' => 'data:image/jpeg',
44
        'jpeg' => 'data:image/jpeg',
45
        'svg' => 'data:image/svg+xml',
46
        'woff' => 'data:application/x-font-woff',
47
        'tif' => 'image/tiff',
48
        'tiff' => 'image/tiff',
49
        'xbm' => 'image/x-xbitmap',
50
    );
51
52
    /**
53
     * Set the maximum size if files to be imported.
54
     *
55
     * Files larger than this size (in kB) will not be imported into the CSS.
56
     * Importing files into the CSS as data-uri will save you some connections,
57
     * but we should only import relatively small decorative images so that our
58
     * CSS file doesn't get too bulky.
59
     *
60
     * @param int $size Size in kB
61
     */
62
    public function setMaxImportSize($size)
63
    {
64
        $this->maxImportSize = $size;
65
    }
66
67
    /**
68
     * Set the type of extensions to be imported into the CSS (to save network
69
     * connections).
70
     * Keys of the array should be the file extensions & respective values
71
     * should be the data type.
72
     *
73
     * @param string[] $extensions Array of file extensions
74
     */
75
    public function setImportExtensions(array $extensions)
76
    {
77
        $this->importExtensions = $extensions;
78
    }
79
80
    /**
81
     * Move any import statements to the top.
82
     *
83
     * @param string $content Nearly finished CSS content
84
     *
85
     * @return string
86
     */
87
    protected function moveImportsToTop($content)
88
    {
89
        if (preg_match_all('/(;?)(@import (?<url>url\()?(?P<quotes>["\']?).+?(?P=quotes)(?(url)\)));?/', $content, $matches)) {
90
            // remove from content
91
            foreach ($matches[0] as $import) {
92
                $content = str_replace($import, '', $content);
93
            }
94
95
            // add to top
96
            $content = implode(';', $matches[2]).';'.trim($content, ';');
97
        }
98
99
        return $content;
100
    }
101
102
    /**
103
     * Combine CSS from import statements.
104
     *
105
     * @import's will be loaded and their content merged into the original file,
106
     * to save HTTP requests.
107
     *
108
     * @param string   $source  The file to combine imports for
109
     * @param string   $content The CSS content to combine imports for
110
     * @param string[] $parents Parent paths, for circular reference checks
111
     *
112
     * @return string
113
     *
114
     * @throws FileImportException
115
     */
116
    protected function combineImports($source, $content, $parents)
117
    {
118
        $importRegexes = array(
119
            // @import url(xxx)
120
            '/
121
            # import statement
122
            @import
123
124
            # whitespace
125
            \s+
126
127
                # open url()
128
                url\(
129
130
                    # (optional) open path enclosure
131
                    (?P<quotes>["\']?)
132
133
                        # fetch path
134
                        (?P<path>.+?)
135
136
                    # (optional) close path enclosure
137
                    (?P=quotes)
138
139
                # close url()
140
                \)
141
142
                # (optional) trailing whitespace
143
                \s*
144
145
                # (optional) media statement(s)
146
                (?P<media>[^;]*)
147
148
                # (optional) trailing whitespace
149
                \s*
150
151
            # (optional) closing semi-colon
152
            ;?
153
154
            /ix',
155
156
            // @import 'xxx'
157
            '/
158
159
            # import statement
160
            @import
161
162
            # whitespace
163
            \s+
164
165
                # open path enclosure
166
                (?P<quotes>["\'])
167
168
                    # fetch path
169
                    (?P<path>.+?)
170
171
                # close path enclosure
172
                (?P=quotes)
173
174
                # (optional) trailing whitespace
175
                \s*
176
177
                # (optional) media statement(s)
178
                (?P<media>[^;]*)
179
180
                # (optional) trailing whitespace
181
                \s*
182
183
            # (optional) closing semi-colon
184
            ;?
185
186
            /ix',
187
        );
188
189
        // find all relative imports in css
190
        $matches = array();
191
        foreach ($importRegexes as $importRegex) {
192
            if (preg_match_all($importRegex, $content, $regexMatches, PREG_SET_ORDER)) {
193
                $matches = array_merge($matches, $regexMatches);
194
            }
195
        }
196
197
        $search = array();
198
        $replace = array();
199
200
        // loop the matches
201
        foreach ($matches as $match) {
202
            // get the path for the file that will be imported
203
            $importPath = dirname($source).'/'.$match['path'];
204
205
            // only replace the import with the content if we can grab the
206
            // content of the file
207
            if (!$this->canImportByPath($match['path']) || !$this->canImportFile($importPath)) {
208
                continue;
209
            }
210
211
            // check if current file was not imported previously in the same
212
            // import chain.
213
            if (in_array($importPath, $parents)) {
214
                throw new FileImportException('Failed to import file "'.$importPath.'": circular reference detected.');
215
            }
216
217
            // grab referenced file & minify it (which may include importing
218
            // yet other @import statements recursively)
219
            $minifier = new static($importPath);
220
            $minifier->setMaxImportSize($this->maxImportSize);
221
            $minifier->setImportExtensions($this->importExtensions);
222
            $importContent = $minifier->execute($source, $parents);
223
224
            // check if this is only valid for certain media
225
            if (!empty($match['media'])) {
226
                $importContent = '@media '.$match['media'].'{'.$importContent.'}';
227
            }
228
229
            // add to replacement array
230
            $search[] = $match[0];
231
            $replace[] = $importContent;
232
        }
233
234
        // replace the import statements
235
        return str_replace($search, $replace, $content);
236
    }
237
238
    /**
239
     * Import files into the CSS, base64-ized.
240
     *
241
     * @url(image.jpg) images will be loaded and their content merged into the
242
     * original file, to save HTTP requests.
243
     *
244
     * @param string $source  The file to import files for
245
     * @param string $content The CSS content to import files for
246
     *
247
     * @return string
248
     */
249
    protected function importFiles($source, $content)
250
    {
251
        $regex = '/url\((["\']?)(.+?)\\1\)/i';
252
        if ($this->importExtensions && preg_match_all($regex, $content, $matches, PREG_SET_ORDER)) {
0 ignored issues
show
Bug Best Practice introduced by Matthias Mullie
The expression $this->importExtensions of type string[] is implicitly converted to a boolean; are you sure this is intended? If so, consider using ! empty($expr) instead to make it clear that you intend to check for an array without elements.

This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent.

Consider making the comparison explicit by using empty(..) or ! empty(...) instead.

Loading history...
253
            $search = array();
254
            $replace = array();
255
256
            // loop the matches
257
            foreach ($matches as $match) {
258
                $extension = substr(strrchr($match[2], '.'), 1);
259
                if ($extension && !array_key_exists($extension, $this->importExtensions)) {
260
                    continue;
261
                }
262
263
                // get the path for the file that will be imported
264
                $path = $match[2];
265
                $path = dirname($source).'/'.$path;
266
267
                // only replace the import with the content if we're able to get
268
                // the content of the file, and it's relatively small
269
                if ($this->canImportFile($path) && $this->canImportBySize($path)) {
270
                    // grab content && base64-ize
271
                    $importContent = $this->load($path);
272
                    $importContent = base64_encode($importContent);
273
274
                    // build replacement
275
                    $search[] = $match[0];
276
                    $replace[] = 'url('.$this->importExtensions[$extension].';base64,'.$importContent.')';
277
                }
278
            }
279
280
            // replace the import statements
281
            $content = str_replace($search, $replace, $content);
282
        }
283
284
        return $content;
285
    }
286
287
    /**
288
     * Minify the data.
289
     * Perform CSS optimizations.
290
     *
291
     * @param string[optional] $path    Path to write the data to
292
     * @param string[]         $parents Parent paths, for circular reference checks
293
     *
294
     * @return string The minified data
295
     */
296
    public function execute($path = null, $parents = array())
297
    {
298
        $content = '';
299
300
        // loop CSS data (raw data and files)
301
        foreach ($this->data as $source => $css) {
302
            /*
303
             * Let's first take out strings & comments, since we can't just
304
             * remove whitespace anywhere. If whitespace occurs inside a string,
305
             * we should leave it alone. E.g.:
306
             * p { content: "a   test" }
307
             */
308
            $this->extractStrings();
309
            $this->stripComments();
310
            $this->extractCalcs();
311
            $css = $this->replace($css);
312
313
            $css = $this->stripWhitespace($css);
314
            $css = $this->shortenHex($css);
315
            $css = $this->shortenZeroes($css);
316
            $css = $this->shortenFontWeights($css);
317
            $css = $this->stripEmptyTags($css);
318
319
            // restore the string we've extracted earlier
320
            $css = $this->restoreExtractedData($css);
321
322
            $source = is_int($source) ? '' : $source;
323
            $parents = $source ? array_merge($parents, array($source)) : $parents;
324
            $css = $this->combineImports($source, $css, $parents);
325
            $css = $this->importFiles($source, $css);
326
327
            /*
328
             * If we'll save to a new path, we'll have to fix the relative paths
329
             * to be relative no longer to the source file, but to the new path.
330
             * If we don't write to a file, fall back to same path so no
331
             * conversion happens (because we still want it to go through most
332
             * of the move code, which also addresses url() & @import syntax...)
333
             */
334
            $converter = $this->getPathConverter($source, $path ?: $source);
335
            $css = $this->move($converter, $css);
336
337
            // combine css
338
            $content .= $css;
339
        }
340
341
        $content = $this->moveImportsToTop($content);
342
343
        return $content;
344
    }
345
346
    /**
347
     * Moving a css file should update all relative urls.
348
     * Relative references (e.g. ../images/image.gif) in a certain css file,
349
     * will have to be updated when a file is being saved at another location
350
     * (e.g. ../../images/image.gif, if the new CSS file is 1 folder deeper).
351
     *
352
     * @param ConverterInterface $converter Relative path converter
353
     * @param string             $content   The CSS content to update relative urls for
354
     *
355
     * @return string
356
     */
357
    protected function move(ConverterInterface $converter, $content)
358
    {
359
        /*
360
         * Relative path references will usually be enclosed by url(). @import
361
         * is an exception, where url() is not necessary around the path (but is
362
         * allowed).
363
         * This *could* be 1 regular expression, where both regular expressions
364
         * in this array are on different sides of a |. But we're using named
365
         * patterns in both regexes, the same name on both regexes. This is only
366
         * possible with a (?J) modifier, but that only works after a fairly
367
         * recent PCRE version. That's why I'm doing 2 separate regular
368
         * expressions & combining the matches after executing of both.
369
         */
370
        $relativeRegexes = array(
371
            // url(xxx)
372
            '/
373
            # open url()
374
            url\(
375
376
                \s*
377
378
                # open path enclosure
379
                (?P<quotes>["\'])?
380
381
                    # fetch path
382
                    (?P<path>.+?)
383
384
                # close path enclosure
385
                (?(quotes)(?P=quotes))
386
387
                \s*
388
389
            # close url()
390
            \)
391
392
            /ix',
393
394
            // @import "xxx"
395
            '/
396
            # import statement
397
            @import
398
399
            # whitespace
400
            \s+
401
402
                # we don\'t have to check for @import url(), because the
403
                # condition above will already catch these
404
405
                # open path enclosure
406
                (?P<quotes>["\'])
407
408
                    # fetch path
409
                    (?P<path>.+?)
410
411
                # close path enclosure
412
                (?P=quotes)
413
414
            /ix',
415
        );
416
417
        // find all relative urls in css
418
        $matches = array();
419
        foreach ($relativeRegexes as $relativeRegex) {
420
            if (preg_match_all($relativeRegex, $content, $regexMatches, PREG_SET_ORDER)) {
421
                $matches = array_merge($matches, $regexMatches);
422
            }
423
        }
424
425
        $search = array();
426
        $replace = array();
427
428
        // loop all urls
429
        foreach ($matches as $match) {
430
            // determine if it's a url() or an @import match
431
            $type = (strpos($match[0], '@import') === 0 ? 'import' : 'url');
432
433
            $url = $match['path'];
434
            if ($this->canImportByPath($url)) {
435
                // attempting to interpret GET-params makes no sense, so let's discard them for awhile
436
                $params = strrchr($url, '?');
437
                $url = $params ? substr($url, 0, -strlen($params)) : $url;
438
439
                // fix relative url
440
                $url = $converter->convert($url);
441
442
                // now that the path has been converted, re-apply GET-params
443
                $url .= $params;
444
            }
445
446
            /*
447
             * Urls with control characters above 0x7e should be quoted.
448
             * According to Mozilla's parser, whitespace is only allowed at the
449
             * end of unquoted urls.
450
             * Urls with `)` (as could happen with data: uris) should also be
451
             * quoted to avoid being confused for the url() closing parentheses.
452
             * And urls with a # have also been reported to cause issues.
453
             * Urls with quotes inside should also remain escaped.
454
             *
455
             * @see https://developer.mozilla.org/nl/docs/Web/CSS/url#The_url()_functional_notation
456
             * @see https://hg.mozilla.org/mozilla-central/rev/14abca4e7378
457
             * @see https://github.com/matthiasmullie/minify/issues/193
458
             */
459
            $url = trim($url);
460
            if (preg_match('/[\s\)\'"#\x{7f}-\x{9f}]/u', $url)) {
461
                $url = $match['quotes'] . $url . $match['quotes'];
462
            }
463
464
            // build replacement
465
            $search[] = $match[0];
466
            if ($type === 'url') {
467
                $replace[] = 'url('.$url.')';
468
            } elseif ($type === 'import') {
469
                $replace[] = '@import "'.$url.'"';
470
            }
471
        }
472
473
        // replace urls
474
        return str_replace($search, $replace, $content);
475
    }
476
477
    /**
478
     * Shorthand hex color codes.
479
     * #FF0000 -> #F00.
480
     *
481
     * @param string $content The CSS content to shorten the hex color codes for
482
     *
483
     * @return string
484
     */
485
    protected function shortenHex($content)
486
    {
487
        $content = preg_replace('/(?<=[: ])#([0-9a-z])\\1([0-9a-z])\\2([0-9a-z])\\3(?=[; }])/i', '#$1$2$3', $content);
488
489
        // we can shorten some even more by replacing them with their color name
490
        $colors = array(
491
            '#F0FFFF' => 'azure',
492
            '#F5F5DC' => 'beige',
493
            '#A52A2A' => 'brown',
494
            '#FF7F50' => 'coral',
495
            '#FFD700' => 'gold',
496
            '#808080' => 'gray',
497
            '#008000' => 'green',
498
            '#4B0082' => 'indigo',
499
            '#FFFFF0' => 'ivory',
500
            '#F0E68C' => 'khaki',
501
            '#FAF0E6' => 'linen',
502
            '#800000' => 'maroon',
503
            '#000080' => 'navy',
504
            '#808000' => 'olive',
505
            '#CD853F' => 'peru',
506
            '#FFC0CB' => 'pink',
507
            '#DDA0DD' => 'plum',
508
            '#800080' => 'purple',
509
            '#F00' => 'red',
510
            '#FA8072' => 'salmon',
511
            '#A0522D' => 'sienna',
512
            '#C0C0C0' => 'silver',
513
            '#FFFAFA' => 'snow',
514
            '#D2B48C' => 'tan',
515
            '#FF6347' => 'tomato',
516
            '#EE82EE' => 'violet',
517
            '#F5DEB3' => 'wheat',
518
        );
519
520
        return preg_replace_callback(
521
            '/(?<=[: ])('.implode(array_keys($colors), '|').')(?=[; }])/i',
522
            function ($match) use ($colors) {
523
                return $colors[strtoupper($match[0])];
524
            },
525
            $content
526
        );
527
    }
528
529
    /**
530
     * Shorten CSS font weights.
531
     *
532
     * @param string $content The CSS content to shorten the font weights for
533
     *
534
     * @return string
535
     */
536
    protected function shortenFontWeights($content)
537
    {
538
        $weights = array(
539
            'normal' => 400,
540
            'bold' => 700,
541
        );
542
543
        $callback = function ($match) use ($weights) {
544
            return $match[1].$weights[$match[2]];
545
        };
546
547
        return preg_replace_callback('/(font-weight\s*:\s*)('.implode('|', array_keys($weights)).')(?=[;}])/', $callback, $content);
548
    }
549
550
    /**
551
     * Shorthand 0 values to plain 0, instead of e.g. -0em.
552
     *
553
     * @param string $content The CSS content to shorten the zero values for
554
     *
555
     * @return string
556
     */
557
    protected function shortenZeroes($content)
558
    {
559
        // we don't want to strip units in `calc()` expressions:
560
        // `5px - 0px` is valid, but `5px - 0` is not
561
        // `10px * 0` is valid (equates to 0), and so is `10 * 0px`, but
562
        // `10 * 0` is invalid
563
        // we've extracted calcs earlier, so we don't need to worry about this
564
565
        // reusable bits of code throughout these regexes:
566
        // before & after are used to make sure we don't match lose unintended
567
        // 0-like values (e.g. in #000, or in http://url/1.0)
568
        // units can be stripped from 0 values, or used to recognize non 0
569
        // values (where wa may be able to strip a .0 suffix)
570
        $before = '(?<=[:(, ])';
571
        $after = '(?=[ ,);}])';
572
        $units = '(em|ex|%|px|cm|mm|in|pt|pc|ch|rem|vh|vw|vmin|vmax|vm)';
573
574
        // strip units after zeroes (0px -> 0)
575
        // NOTE: it should be safe to remove all units for a 0 value, but in
576
        // practice, Webkit (especially Safari) seems to stumble over at least
577
        // 0%, potentially other units as well. Only stripping 'px' for now.
578
        // @see https://github.com/matthiasmullie/minify/issues/60
579
        $content = preg_replace('/'.$before.'(-?0*(\.0+)?)(?<=0)px'.$after.'/', '\\1', $content);
580
581
        // strip 0-digits (.0 -> 0)
582
        $content = preg_replace('/'.$before.'\.0+'.$units.'?'.$after.'/', '0\\1', $content);
583
        // strip trailing 0: 50.10 -> 50.1, 50.10px -> 50.1px
584
        $content = preg_replace('/'.$before.'(-?[0-9]+\.[0-9]+)0+'.$units.'?'.$after.'/', '\\1\\2', $content);
585
        // strip trailing 0: 50.00 -> 50, 50.00px -> 50px
586
        $content = preg_replace('/'.$before.'(-?[0-9]+)\.0+'.$units.'?'.$after.'/', '\\1\\2', $content);
587
        // strip leading 0: 0.1 -> .1, 01.1 -> 1.1
588
        $content = preg_replace('/'.$before.'(-?)0+([0-9]*\.[0-9]+)'.$units.'?'.$after.'/', '\\1\\2\\3', $content);
589
590
        // strip negative zeroes (-0 -> 0) & truncate zeroes (00 -> 0)
591
        $content = preg_replace('/'.$before.'-?0+'.$units.'?'.$after.'/', '0\\1', $content);
592
593
        // IE doesn't seem to understand a unitless flex-basis value (correct -
594
        // it goes against the spec), so let's add it in again (make it `%`,
595
        // which is only 1 char: 0%, 0px, 0 anything, it's all just the same)
596
        // @see https://developer.mozilla.org/nl/docs/Web/CSS/flex
597
        $content = preg_replace('/flex:([0-9]+\s[0-9]+\s)0([;\}])/', 'flex:${1}0%${2}', $content);
598
        $content = preg_replace('/flex-basis:0([;\}])/', 'flex-basis:0%${1}', $content);
599
600
        return $content;
601
    }
602
603
    /**
604
     * Strip empty tags from source code.
605
     *
606
     * @param string $content
607
     *
608
     * @return string
609
     */
610
    protected function stripEmptyTags($content)
611
    {
612
        $content = preg_replace('/(?<=^)[^\{\};]+\{\s*\}/', '', $content);
613
        $content = preg_replace('/(?<=(\}|;))[^\{\};]+\{\s*\}/', '', $content);
614
615
        return $content;
616
    }
617
618
    /**
619
     * Strip comments from source code.
620
     */
621
    protected function stripComments()
622
    {
623
        $this->registerPattern('/\/\*.*?\*\//s', '');
624
    }
625
626
    /**
627
     * Strip whitespace.
628
     *
629
     * @param string $content The CSS content to strip the whitespace for
630
     *
631
     * @return string
632
     */
633
    protected function stripWhitespace($content)
634
    {
635
        // remove leading & trailing whitespace
636
        $content = preg_replace('/^\s*/m', '', $content);
637
        $content = preg_replace('/\s*$/m', '', $content);
638
639
        // replace newlines with a single space
640
        $content = preg_replace('/\s+/', ' ', $content);
641
642
        // remove whitespace around meta characters
643
        // inspired by stackoverflow.com/questions/15195750/minify-compress-css-with-regex
644
        $content = preg_replace('/\s*([\*$~^|]?+=|[{};,>~]|!important\b)\s*/', '$1', $content);
645
        $content = preg_replace('/([\[(:>\+])\s+/', '$1', $content);
646
        $content = preg_replace('/\s+([\]\)>\+])/', '$1', $content);
647
        $content = preg_replace('/\s+(:)(?![^\}]*\{)/', '$1', $content);
648
649
        // whitespace around + and - can only be stripped inside some pseudo-
650
        // classes, like `:nth-child(3+2n)`
651
        // not in things like `calc(3px + 2px)`, shorthands like `3px -2px`, or
652
        // selectors like `div.weird- p`
653
        $pseudos = array('nth-child', 'nth-last-child', 'nth-last-of-type', 'nth-of-type');
654
        $content = preg_replace('/:('.implode('|', $pseudos).')\(\s*([+-]?)\s*(.+?)\s*([+-]?)\s*(.*?)\s*\)/', ':$1($2$3$4$5)', $content);
655
656
        // remove semicolon/whitespace followed by closing bracket
657
        $content = str_replace(';}', '}', $content);
658
659
        return trim($content);
660
    }
661
662
    /**
663
     * Replace all `calc()` occurrences.
664
     */
665
    protected function extractCalcs()
666
    {
667
        // PHP only supports $this inside anonymous functions since 5.4
668
        $minifier = $this;
669
        $callback = function ($match) use ($minifier) {
670
            $length = strlen($match[1]);
671
            $expr = '';
672
            $opened = 0;
673
674
            for ($i = 0; $i < $length; $i++) {
675
                $char = $match[1][$i];
676
                $expr .= $char;
677
                if ($char === '(') {
678
                    $opened++;
679
                } elseif ($char === ')' && --$opened === 0) {
680
                    break;
681
                }
682
            }
683
            $rest = str_replace($expr, '', $match[1]);
684
            $expr = trim(substr($expr, 1, -1));
685
686
            $count = count($minifier->extracted);
687
            $placeholder = 'calc('.$count.')';
688
            $minifier->extracted[$placeholder] = 'calc('.$expr.')';
689
690
            return $placeholder.$rest;
691
        };
692
693
        $this->registerPattern('/calc(\(.+?)(?=$|;|calc\()/', $callback);
694
    }
695
696
    /**
697
     * Check if file is small enough to be imported.
698
     *
699
     * @param string $path The path to the file
700
     *
701
     * @return bool
702
     */
703
    protected function canImportBySize($path)
704
    {
705
        return ($size = @filesize($path)) && $size <= $this->maxImportSize * 1024;
706
    }
707
708
    /**
709
     * Check if file a file can be imported, going by the path.
710
     *
711
     * @param string $path
712
     *
713
     * @return bool
714
     */
715
    protected function canImportByPath($path)
716
    {
717
        return preg_match('/^(data:|https?:|\\/)/', $path) === 0;
718
    }
719
720
    /**
721
     * Return a converter to update relative paths to be relative to the new
722
     * destination.
723
     *
724
     * @param string $source
725
     * @param string $target
726
     *
727
     * @return ConverterInterface
728
     */
729
    protected function getPathConverter($source, $target)
730
    {
731
        return new Converter($source, $target);
732
    }
733
}
734