CSS::importFiles() - Code Metrics - Inspection of "Merge branch 'GinoPane-master'" - matthiasmullie/minify - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 51c3c7...cad5d7 )

by Matthias

created 2016-02-17 14:33 UTC

CSS::importFiles() B

↳ Parent: CSS

Complexity

Conditions	6
Paths	2

Size

Total Lines	34
Code Lines	17

Duplication

Lines	0
Ratio	0 %

Importance

Changes	8
Bugs	2	Features	1

Metric	Value
c	8
b	2
f	1
dl	0
loc	34
rs	8.439
cc	6
eloc	17
nc	2
nop	2

<?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 <[email protected]>
 * @author Tijs Verkoyen <[email protected]>
 * @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 $content string Nearly finished CSS content
     *
     * @return string
     */
    protected function moveImportsToTop($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 array  $parents Parent paths, for circular reference checks.
     *
     * @return string
     *
     * @throws FileImportException
     */
    protected function combineImports($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 ($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 = $this->stripEmptyTags($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);

        return $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);

        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;
    }
}


1			<?php
2
3			namespace MatthiasMullie\Minify;
4
5			use MatthiasMullie\Minify\Exceptions\FileImportException;
6			use MatthiasMullie\PathConverter\Converter;
7
8			/**
9			* CSS minifier.
10			*
11			* Please report bugs on https://github.com/matthiasmullie/minify/issues
12			*
13			* @author Matthias Mullie <[email protected]>
14			* @author Tijs Verkoyen <[email protected]>
15			* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved.
16			* @license MIT License
17			*/
18			class CSS extends Minify
19			{
20			/**
21			* @var int
22			*/
23			protected $maxImportSize = 5;
24
25			/**
26			* @var string[]
27			*/
28			protected $importExtensions = array(
29			'gif' => 'data:image/gif',
30			'png' => 'data:image/png',
31			'jpe' => 'data:image/jpeg',
32			'jpg' => 'data:image/jpeg',
33			'jpeg' => 'data:image/jpeg',
34			'svg' => 'data:image/svg+xml',
35			'woff' => 'data:application/x-font-woff',
36			'tif' => 'image/tiff',
37			'tiff' => 'image/tiff',
38			'xbm' => 'image/x-xbitmap',
39			);
40
41			/**
42			* Set the maximum size if files to be imported.
43			*
44			* Files larger than this size (in kB) will not be imported into the CSS.
45			* Importing files into the CSS as data-uri will save you some connections,
46			* but we should only import relatively small decorative images so that our
47			* CSS file doesn't get too bulky.
48			*
49			* @param int $size Size in kB
50			*/
51			public function setMaxImportSize($size)
52			{
53			$this->maxImportSize = $size;
54			}
55
56			/**
57			* Set the type of extensions to be imported into the CSS (to save network
58			* connections).
59			* Keys of the array should be the file extensions & respective values
60			* should be the data type.
61			*
62			* @param string[] $extensions Array of file extensions
63			*/
64			public function setImportExtensions(array $extensions)
65			{
66			$this->importExtensions = $extensions;
67			}
68
69			/**
70			* Move any import statements to the top.
71			*
72			* @param $content string Nearly finished CSS content
73			*
74			* @return string
75			*/
76			protected function moveImportsToTop($content)
77			{
78			if (preg_match_all('/@import[^;]+;/', $content, $matches)) {
79
80			// remove from content
81			foreach ($matches[0] as $import) {
82			$content = str_replace($import, '', $content);
83			}
84
85			// add to top
86			$content = implode('', $matches[0]).$content;
87			};
88
89			return $content;
90			}
91
92			/**
93			* Combine CSS from import statements.
94			*
95			* @import's will be loaded and their content merged into the original file,
96			* to save HTTP requests.
97			*
98			* @param string $source The file to combine imports for.
99			* @param string $content The CSS content to combine imports for.
100			* @param array $parents Parent paths, for circular reference checks.
101			*
102			* @return string
103			*
104			* @throws FileImportException
105			*/
106			protected function combineImports($source, $content, $parents)
107			{
108			$importRegexes = array(
109			// @import url(xxx)
110			'/
111			# import statement
112			@import
113
114			# whitespace
115			\s+
116
117			# open url()
118			url\(
119
120			# (optional) open path enclosure
121			(?P<quotes>["\']?)
122
123			# fetch path
124			(?P<path>
125
126			# do not fetch data uris or external sources
127			(?!(
128			["\']?
129			(data\|https?):
130			))
131
132			.+?
133			)
134
135			# (optional) close path enclosure
136			(?P=quotes)
137
138			# close url()
139			\)
140
141			# (optional) trailing whitespace
142			\s*
143
144			# (optional) media statement(s)
145			(?P<media>[^;]*)
146
147			# (optional) trailing whitespace
148			\s*
149
150			# (optional) closing semi-colon
151			;?
152
153			/ix',
154
155			// @import 'xxx'
156			'/
157
158			# import statement
159			@import
160
161			# whitespace
162			\s+
163
164			# open path enclosure
165			(?P<quotes>["\'])
166
167			# fetch path
168			(?P<path>
169
170			# do not fetch data uris or external sources
171			(?!(
172			["\']?
173			(data\|https?):
174			))
175
176			.+?
177			)
178
179			# close path enclosure
180			(?P=quotes)
181
182			# (optional) trailing whitespace
183			\s*
184
185			# (optional) media statement(s)
186			(?P<media>[^;]*)
187
188			# (optional) trailing whitespace
189			\s*
190
191			# (optional) closing semi-colon
192			;?
193
194			/ix',
195			);
196
197			// find all relative imports in css
198			$matches = array();
199			foreach ($importRegexes as $importRegex) {
200			if (preg_match_all($importRegex, $content, $regexMatches, PREG_SET_ORDER)) {
201			$matches = array_merge($matches, $regexMatches);
202			}
203			}
204
205			$search = array();
206			$replace = array();
207
208			// loop the matches
209			foreach ($matches as $match) {
210			// get the path for the file that will be imported
211			$importPath = dirname($source).'/'.$match['path'];
212
213			// only replace the import with the content if we can grab the
214			// content of the file
215			if ($this->canImportFile($importPath)) {
216			// check if current file was not imported previously in the same
217			// import chain.
218			if (in_array($importPath, $parents)) {
219			throw new FileImportException('Failed to import file "'.$importPath.'": circular reference detected.');
220			}
221
222			// grab referenced file & minify it (which may include importing
223			// yet other @import statements recursively)
224			$minifier = new static($importPath);
225			$importContent = $minifier->execute($source, $parents);
226
227			// check if this is only valid for certain media
228			if (!empty($match['media'])) {
229			$importContent = '@media '.$match['media'].'{'.$importContent.'}';
230			}
231
232			// add to replacement array
233			$search[] = $match[0];
234			$replace[] = $importContent;
235			}
236			}
237
238			// replace the import statements
239			$content = str_replace($search, $replace, $content);
240
241			return $content;
242			}
243
244			/**
245			* Import files into the CSS, base64-ized.
246			*
247			* @url(image.jpg) images will be loaded and their content merged into the
248			* original file, to save HTTP requests.
249			*
250			* @param string $source The file to import files for.
251			* @param string $content The CSS content to import files for.
252			*
253			* @return string
254			*/
255			protected function importFiles($source, $content)
256			{
257			$extensions = array_keys($this->importExtensions);
258			$regex = '/url\((["\']?)((?!["\']?data:).*?\.('.implode('\|', $extensions).'))\\1\)/i';
259			if ($extensions && preg_match_all($regex, $content, $matches, PREG_SET_ORDER)) {
			0 ignored issues – show Bug Best Practice introduced 2015-12-17 21:43 UTC by Report Bug Copy Issue Report The expression `$extensions` of type `integer[]` 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...
260			$search = array();
261			$replace = array();
262
263			// loop the matches
264			foreach ($matches as $match) {
265			// get the path for the file that will be imported
266			$path = $match[2];
267			$path = dirname($source).'/'.$path;
268			$extension = $match[3];
269
270			// only replace the import with the content if we're able to get
271			// the content of the file, and it's relatively small
272			if ($this->canImportFile($path) && $this->canImportBySize($path)) {
273			// grab content && base64-ize
274			$importContent = $this->load($path);
275			$importContent = base64_encode($importContent);
276
277			// build replacement
278			$search[] = $match[0];
279			$replace[] = 'url('.$this->importExtensions[$extension].';base64,'.$importContent.')';
280			}
281			}
282
283			// replace the import statements
284			$content = str_replace($search, $replace, $content);
285			}
286
287			return $content;
288			}
289
290			/**
291			* Minify the data.
292			* Perform CSS optimizations.
293			*
294			* @param string[optional] $path Path to write the data to.
295			* @param string[] $parents Parent paths, for circular reference checks.
296			*
297			* @return string The minified data.
298			*/
299			public function execute($path = null, $parents = array())
300			{
301			$content = '';
302
303			// loop css data (raw data and files)
304			foreach ($this->data as $source => $css) {
305			/*
306			* Let's first take out strings & comments, since we can't just remove
307			* whitespace anywhere. If whitespace occurs inside a string, we should
308			* leave it alone. E.g.:
309			* p { content: "a test" }
310			*/
311			$this->extractStrings();
312			$this->stripComments();
313			$css = $this->replace($css);
314
315			$css = $this->stripWhitespace($css);
316			$css = $this->shortenHex($css);
317			$css = $this->shortenZeroes($css);
318			$css = $this->stripEmptyTags($css);
319
320			// restore the string we've extracted earlier
321			$css = $this->restoreExtractedData($css);
322
323			$source = is_int($source) ? '' : $source;
324			$parents = $source ? array_merge($parents, array($source)) : $parents;
325			$css = $this->combineImports($source, $css, $parents);
326			$css = $this->importFiles($source, $css);
327
328			/*
329			* If we'll save to a new path, we'll have to fix the relative paths
330			* to be relative no longer to the source file, but to the new path.
331			* If we don't write to a file, fall back to same path so no
332			* conversion happens (because we still want it to go through most
333			* of the move code...)
334			*/
335			$converter = new Converter($source, $path ?: $source);
336			$css = $this->move($converter, $css);
337
338			// combine css
339			$content .= $css;
340			}
341
342			$content = $this->moveImportsToTop($content);
343
344			return $content;
345			}
346
347			/**
348			* Moving a css file should update all relative urls.
349			* Relative references (e.g. ../images/image.gif) in a certain css file,
350			* will have to be updated when a file is being saved at another location
351			* (e.g. ../../images/image.gif, if the new CSS file is 1 folder deeper).
352			*
353			* @param Converter $converter Relative path converter
354			* @param string $content The CSS content to update relative urls for.
355			*
356			* @return string
357			*/
358			protected function move(Converter $converter, $content)
359			{
360			/*
361			* Relative path references will usually be enclosed by url(). @import
362			* is an exception, where url() is not necessary around the path (but is
363			* allowed).
364			* This could be 1 regular expression, where both regular expressions
365			* in this array are on different sides of a \|. But we're using named
366			* patterns in both regexes, the same name on both regexes. This is only
367			* possible with a (?J) modifier, but that only works after a fairly
368			* recent PCRE version. That's why I'm doing 2 separate regular
369			* expressions & combining the matches after executing of both.
370			*/
371			$relativeRegexes = array(
372			// url(xxx)
373			'/
374			# open url()
375			url\(
376
377			\s*
378
379			# open path enclosure
380			(?P<quotes>["\'])?
381
382			# fetch path
383			(?P<path>
384
385			# do not fetch data uris or external sources
386			(?!(
387			\s?
388			["\']?
389			(data\|https?):
390			))
391
392			.+?
393			)
394
395			# close path enclosure
396			(?(quotes)(?P=quotes))
397
398			\s*
399
400			# close url()
401			\)
402
403			/ix',
404
405			// @import "xxx"
406			'/
407			# import statement
408			@import
409
410			# whitespace
411			\s+
412
413			# we don\'t have to check for @import url(), because the
414			# condition above will already catch these
415
416			# open path enclosure
417			(?P<quotes>["\'])
418
419			# fetch path
420			(?P<path>
421
422			# do not fetch data uris or external sources
423			(?!(
424			["\']?
425			(data\|https?):
426			))
427
428			.+?
429			)
430
431			# close path enclosure
432			(?P=quotes)
433
434			/ix',
435			);
436
437			// find all relative urls in css
438			$matches = array();
439			foreach ($relativeRegexes as $relativeRegex) {
440			if (preg_match_all($relativeRegex, $content, $regexMatches, PREG_SET_ORDER)) {
441			$matches = array_merge($matches, $regexMatches);
442			}
443			}
444
445			$search = array();
446			$replace = array();
447
448			// loop all urls
449			foreach ($matches as $match) {
450			// determine if it's a url() or an @import match
451			$type = (strpos($match[0], '@import') === 0 ? 'import' : 'url');
452
453			// attempting to interpret GET-params makes no sense, so let's discard them for awhile
454			$params = strrchr($match['path'], '?');
455			$url = $params ? substr($match['path'], 0, -strlen($params)) : $match['path'];
456
457			// fix relative url
458			$url = $converter->convert($url);
459
460			// now that the path has been converted, re-apply GET-params
461			$url .= $params;
462
463			// build replacement
464			$search[] = $match[0];
465			if ($type == 'url') {
466			$replace[] = 'url('.$url.')';
467			} elseif ($type == 'import') {
468			$replace[] = '@import "'.$url.'"';
469			}
470			}
471
472			// replace urls
473			$content = str_replace($search, $replace, $content);
474
475			return $content;
476			}
477
478			/**
479			* Shorthand hex color codes.
480			* #FF0000 -> #F00.
481			*
482			* @param string $content The CSS content to shorten the hex color codes for.
483			*
484			* @return string
485			*/
486			protected function shortenHex($content)
487			{
488			$content = preg_replace('/(?<![\'"])#([0-9a-z])\\1([0-9a-z])\\2([0-9a-z])\\3(?![\'"])/i', '#$1$2$3', $content);
489
490			return $content;
491			}
492
493			/**
494			* Shorthand 0 values to plain 0, instead of e.g. -0em.
495			*
496			* @param string $content The CSS content to shorten the zero values for.
497			*
498			* @return string
499			*/
500			protected function shortenZeroes($content)
501			{
502			// reusable bits of code throughout these regexes:
503			// before & after are used to make sure we don't match lose unintended
504			// 0-like values (e.g. in #000, or in http://url/1.0)
505			// units can be stripped from 0 values, or used to recognize non 0
506			// values (where wa may be able to strip a .0 suffix)
507			$before = '(?<=[:(, ])';
508			$after = '(?=[ ,);}])';
509			$units = '(em\|ex\|%\|px\|cm\|mm\|in\|pt\|pc\|ch\|rem\|vh\|vw\|vmin\|vmax\|vm)';
510
511			// strip units after zeroes (0px -> 0)
512			// NOTE: it should be safe to remove all units for a 0 value, but in
513			// practice, Webkit (especially Safari) seems to stumble over at least
514			// 0%, potentially other units as well. Only stripping 'px' for now.
515			// @see https://github.com/matthiasmullie/minify/issues/60
516			$content = preg_replace('/'.$before.'(-?0*(\.0+)?)(?<=0)px'.$after.'/', '\\1', $content);
517
518			// strip 0-digits (.0 -> 0)
519			$content = preg_replace('/'.$before.'\.0+'.$units.'?'.$after.'/', '0\\1', $content);
520			// strip trailing 0: 50.10 -> 50.1, 50.10px -> 50.1px
521			$content = preg_replace('/'.$before.'(-?[0-9]+\.[0-9]+)0+'.$units.'?'.$after.'/', '\\1\\2', $content);
522			// strip trailing 0: 50.00 -> 50, 50.00px -> 50px
523			$content = preg_replace('/'.$before.'(-?[0-9]+)\.0+'.$units.'?'.$after.'/', '\\1\\2', $content);
524			// strip leading 0: 0.1 -> .1, 01.1 -> 1.1
525			$content = preg_replace('/'.$before.'(-?)0+([0-9]*\.[0-9]+)'.$units.'?'.$after.'/', '\\1\\2\\3', $content);
526
527			// strip negative zeroes (-0 -> 0) & truncate zeroes (00 -> 0)
528			$content = preg_replace('/'.$before.'-?0+'.$units.'?'.$after.'/', '0\\1', $content);
529
530			return $content;
531			}
532
533			/**
534			* Strip comments from source code.
535			*
536			* @param string $content
537			*
538			* @return string
539			*/
540			protected function stripEmptyTags($content)
541			{
542			return preg_replace('/(^\|\})[^\{\}]+\{\s*\}/', '\\1', $content);
543			}
544
545			/**
546			* Strip comments from source code.
547			*/
548			protected function stripComments()
549			{
550			$this->registerPattern('/\/\.?\*\//s', '');
551			}
552
553			/**
554			* Strip whitespace.
555			*
556			* @param string $content The CSS content to strip the whitespace for.
557			*
558			* @return string
559			*/
560			protected function stripWhitespace($content)
561			{
562			// remove leading & trailing whitespace
563			$content = preg_replace('/^\s*/m', '', $content);
564			$content = preg_replace('/\s*$/m', '', $content);
565
566			// replace newlines with a single space
567			$content = preg_replace('/\s+/', ' ', $content);
568
569			// remove whitespace around meta characters
570			// inspired by stackoverflow.com/questions/15195750/minify-compress-css-with-regex
571			$content = preg_replace('/\s([\$~^\|]?+=\|[{};,>~]\|!important\b)\s*/', '$1', $content);
572			$content = preg_replace('/([\[(:])\s+/', '$1', $content);
573			$content = preg_replace('/\s+([\]\)])/', '$1', $content);
574			$content = preg_replace('/\s+(:)(?![^\}]*\{)/', '$1', $content);
575
576			// whitespace around + and - can only be stripped in selectors, like
577			// :nth-child(3+2n), not in things like calc(3px + 2px) or shorthands
578			// like 3px -2px
579			$content = preg_replace('/\s([+-])\s(?=[^}]*{)/', '$1', $content);
580
581			// remove semicolon/whitespace followed by closing bracket
582			$content = str_replace(';}', '}', $content);
583
584			return trim($content);
585			}
586
587			/**
588			* Check if file is small enough to be imported.
589			*
590			* @param string $path The path to the file.
591			*
592			* @return bool
593			*/
594			protected function canImportBySize($path)
595			{
596			return ($size = @filesize($path)) && $size <= $this->maxImportSize * 1024;
597			}
598			}
599

matthiasmullie / minify

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