CSS::combineImports() - Code Metrics - Inspection of "Maximize cross-system compatibility. Perform some..." - matthiasmullie/minify - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#94)

by Gino

created 2016-02-08 21:56 UTC

CSS::combineImports() B

↳ Parent: CSS

Complexity

Conditions	6
Paths	12

Size

Total Lines	131
Code Lines	21

Duplication

Lines	0
Ratio	0 %

Importance

Changes	7
Bugs	4	Features	3

Metric	Value
c	7
b	4
f	3
dl	0
loc	131
rs	8.1463
cc	6
eloc	21
nc	12
nop	2

How to fix Long Method

<?php

namespace MatthiasMullie\Minify;

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 $content The CSS content to combine imports for.
     *
     * @return string
     */
    protected function combineImports($source, $content)
    {
        $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)) {
                // grab referenced file & minify it (which may include importing
                // yet other @import statements recursively)
                $minifier = new static($importPath);
                $importContent = $minifier->execute($source);

                // 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
                $import = strlen($path) < PHP_MAXPATHLEN;
                $import = $import && file_exists($path);
                $import = $import && is_file($path);
                $import = $import && filesize($path) <= $this->maxImportSize * 1024;
                if (!$import) {
                    continue;
                }

                // 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] $path Path to write the data to.
     *
     * @return string The minified data.
     */
    public function execute($path = null)
    {
        $content = '';

        // loop 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 = $source ?: '';
            $css = $this->combineImports($source, $css);
            $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);
    }
}


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

matthiasmullie / minify

Pull Request — master (#94)

CSS::combineImports() B

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