CSS::importFiles() - Code Metrics - Inspection of "Stricter checks for not importing absolute paths" - matthiasmullie/minify - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( cd1511...46820b )

by Matthias

created 2017-01-25 16:30 UTC

CSS::importFiles() C

↳ Parent: CSS

Complexity

Conditions	7
Paths	2

Size

Total Lines	34
Code Lines	17

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	34
rs	6.7272
c	0
b	0
f	0
cc	7
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 string $content Nearly finished CSS content
     *
     * @return string
     */
    protected function moveImportsToTop($content)
    {
        if (preg_match_all('/@import[^;]+;/', $content, $matches)) {
            // remove from content
            foreach ($matches[0] as $import) {
                $content = str_replace($import, '', $content);
            }

            // add to top
            $content = implode('', $matches[0]).$content;
        }

        return $content;
    }

    /**
     * Combine CSS from import statements.
     *
     * @import's will be loaded and their content merged into the original file,
     * to save HTTP requests.
     *
     * @param string   $source  The file to combine imports for
     * @param string   $content The CSS content to combine imports for
     * @param string[] $parents Parent paths, for circular reference checks
     *
     * @return string
     *
     * @throws FileImportException
     */
    protected function combineImports($source, $content, $parents)
    {
        $importRegexes = array(
            // @import url(xxx)
            '/
            # import statement
            @import

            # whitespace
            \s+

                # open url()
                url\(

                    # (optional) open path enclosure
                    (?P<quotes>["\']?)

                        # fetch path
                        (?P<path>

                            # do not fetch data uris, external sources or absolute paths
                            (?!(
                                ["\']?
                                (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, external sources or absolute paths
                        (?!(
                            ["\']?
                            (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 (!$this->canImportByPath($match['path']) || !$this->canImportFile($importPath)) {
                continue;
            }

            // 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
        return str_replace($search, $replace, $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\((["\']?)(.*?\.('.implode('|', $extensions).'))\\1\)/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 ($this->canImportByPath($match[2]) && $this->canImportFile($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 = $this->shortenFontWeights($css);
            $css = $this->stripEmptyTags($css);

            // restore the string we've extracted earlier
            $css = $this->restoreExtractedData($css);

            $source = is_int($source) ? '' : $source;
            $parents = $source ? array_merge($parents, array($source)) : $parents;
            $css = $this->combineImports($source, $css, $parents);
            $css = $this->importFiles($source, $css);

            /*
             * If we'll save to a new path, we'll have to fix the relative paths
             * to be relative no longer to the source file, but to the new path.
             * If we don't write to a file, fall back to same path so no
             * conversion happens (because we still want it to go through most
             * of the move code...)
             */
            $converter = new Converter($source, $path ?: $source);
            $css = $this->move($converter, $css);

            // combine css
            $content .= $css;
        }

        $content = $this->moveImportsToTop($content);

        return $content;
    }

    /**
     * Moving a css file should update all relative urls.
     * Relative references (e.g. ../images/image.gif) in a certain css file,
     * will have to be updated when a file is being saved at another location
     * (e.g. ../../images/image.gif, if the new CSS file is 1 folder deeper).
     *
     * @param Converter $converter Relative path converter
     * @param string    $content   The CSS content to update relative urls for
     *
     * @return string
     */
    protected function move(Converter $converter, $content)
    {
        /*
         * Relative path references will usually be enclosed by url(). @import
         * is an exception, where url() is not necessary around the path (but is
         * allowed).
         * This *could* be 1 regular expression, where both regular expressions
         * in this array are on different sides of a |. But we're using named
         * patterns in both regexes, the same name on both regexes. This is only
         * possible with a (?J) modifier, but that only works after a fairly
         * recent PCRE version. That's why I'm doing 2 separate regular
         * expressions & combining the matches after executing of both.
         */
        $relativeRegexes = array(
            // url(xxx)
            '/
            # open url()
            url\(

                \s*

                # open path enclosure
                (?P<quotes>["\'])?

                    # fetch path
                    (?P<path>.+?)

                # 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>.+?)

                # 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');

            $url = $match['path'];
            if ($this->canImportByPath($url)) {
                // attempting to interpret GET-params makes no sense, so let's discard them for awhile
                $params = strrchr($url, '?');
                $url = $params ? substr($url, 0, -strlen($params)) : $url;

                // 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
        return str_replace($search, $replace, $content);
    }

    /**
     * Shorthand hex color codes.
     * #FF0000 -> #F00.
     *
     * @param string $content The CSS content to shorten the hex color codes for
     *
     * @return string
     */
    protected function shortenHex($content)
    {
        $content = preg_replace('/(?<=[: ])#([0-9a-z])\\1([0-9a-z])\\2([0-9a-z])\\3(?=[; }])/i', '#$1$2$3', $content);

        // we can shorten some even more by replacing them with their color name
        $colors = array(
            '#F0FFFF' => 'azure',
            '#F5F5DC' => 'beige',
            '#A52A2A' => 'brown',
            '#FF7F50' => 'coral',
            '#FFD700' => 'gold',
            '#808080' => 'gray',
            '#008000' => 'green',
            '#4B0082' => 'indigo',
            '#FFFFF0' => 'ivory',
            '#F0E68C' => 'khaki',
            '#FAF0E6' => 'linen',
            '#800000' => 'maroon',
            '#000080' => 'navy',
            '#808000' => 'olive',
            '#CD853F' => 'peru',
            '#FFC0CB' => 'pink',
            '#DDA0DD' => 'plum',
            '#800080' => 'purple',
            '#F00' => 'red',
            '#FA8072' => 'salmon',
            '#A0522D' => 'sienna',
            '#C0C0C0' => 'silver',
            '#FFFAFA' => 'snow',
            '#D2B48C' => 'tan',
            '#FF6347' => 'tomato',
            '#EE82EE' => 'violet',
            '#F5DEB3' => 'wheat',
        );

        return preg_replace_callback(
            '/(?<=[: ])('.implode(array_keys($colors), '|').')(?=[; }])/i',
            function ($match) use ($colors) {
                return $colors[strtoupper($match[0])];
            },
            $content
        );
    }

    /**
     * Shorten CSS font weights.
     *
     * @param string $content The CSS content to shorten the font weights for
     *
     * @return string
     */
    protected function shortenFontWeights($content)
    {
        $weights = array(
            'normal' => 400,
            'bold' => 700,
        );

        $callback = function ($match) use ($weights) {
            return $match[1].$weights[$match[2]];
        };

        return preg_replace_callback('/(font-weight\s*:\s*)('.implode('|', array_keys($weights)).')(?=[;}])/', $callback, $content);
    }

    /**
     * Shorthand 0 values to plain 0, instead of e.g. -0em.
     *
     * @param string $content The CSS content to shorten the zero values for
     *
     * @return string
     */
    protected function shortenZeroes($content)
    {
        // reusable bits of code throughout these regexes:
        // before & after are used to make sure we don't match lose unintended
        // 0-like values (e.g. in #000, or in http://url/1.0)
        // units can be stripped from 0 values, or used to recognize non 0
        // values (where wa may be able to strip a .0 suffix)
        $before = '(?<=[:(, ])';
        $after = '(?=[ ,);}])';
        $units = '(em|ex|%|px|cm|mm|in|pt|pc|ch|rem|vh|vw|vmin|vmax|vm)';

        // strip units after zeroes (0px -> 0)
        // NOTE: it should be safe to remove all units for a 0 value, but in
        // practice, Webkit (especially Safari) seems to stumble over at least
        // 0%, potentially other units as well. Only stripping 'px' for now.
        // @see https://github.com/matthiasmullie/minify/issues/60
        $content = preg_replace('/'.$before.'(-?0*(\.0+)?)(?<=0)px'.$after.'/', '\\1', $content);

        // strip 0-digits (.0 -> 0)
        $content = preg_replace('/'.$before.'\.0+'.$units.'?'.$after.'/', '0\\1', $content);
        // strip trailing 0: 50.10 -> 50.1, 50.10px -> 50.1px
        $content = preg_replace('/'.$before.'(-?[0-9]+\.[0-9]+)0+'.$units.'?'.$after.'/', '\\1\\2', $content);
        // strip trailing 0: 50.00 -> 50, 50.00px -> 50px
        $content = preg_replace('/'.$before.'(-?[0-9]+)\.0+'.$units.'?'.$after.'/', '\\1\\2', $content);
        // strip leading 0: 0.1 -> .1, 01.1 -> 1.1
        $content = preg_replace('/'.$before.'(-?)0+([0-9]*\.[0-9]+)'.$units.'?'.$after.'/', '\\1\\2\\3', $content);

        // strip negative zeroes (-0 -> 0) & truncate zeroes (00 -> 0)
        $content = preg_replace('/'.$before.'-?0+'.$units.'?'.$after.'/', '0\\1', $content);

        // remove zeroes where they make no sense in calc: e.g. calc(100px - 0)
        // the 0 doesn't have any effect, and this isn't even valid without unit
        // strip all `+ 0` or `- 0` occurrences: calc(10% + 0) -> calc(10%)
        // looped because there may be multiple 0s inside 1 group of parentheses
        do {
            $previous = $content;
            $content = preg_replace('/\(([^\(\)]+)\s+[\+\-]\s+0(\s+[^\(\)]+)?\)/', '(\\1\\2)', $content);
        } while ($content !== $previous);
        // strip all `0 +` occurrences: calc(0 + 10%) -> calc(10%)
        $content = preg_replace('/\(\s*0\s+\+\s+([^\(\)]+)\)/', '(\\1)', $content);
        // strip all `0 -` occurrences: calc(0 - 10%) -> calc(-10%)
        $content = preg_replace('/\(\s*0\s+\-\s+([^\(\)]+)\)/', '(-\\1)', $content);
        // I'm not going to attempt to optimize away `x * 0` instances:
        // it's dumb enough code already that it likely won't occur, and it's
        // too complex to do right (order of operations would have to be
        // respected etc)
        // what I cared about most here was fixing incorrectly truncated units

        return $content;
    }

    /**
     * Strip comments from source code.
     *
     * @param string $content
     *
     * @return string
     */
    protected function stripEmptyTags($content)
    {
        return preg_replace('/(^|\}|;)[^\{\};]+\{\s*\}/', '\\1', $content);
    }

    /**
     * Strip comments from source code.
     */
    protected function stripComments()
    {
        $this->registerPattern('/\/\*.*?\*\//s', '');
    }

    /**
     * Strip whitespace.
     *
     * @param string $content The CSS content to strip the whitespace for
     *
     * @return string
     */
    protected function stripWhitespace($content)
    {
        // remove leading & trailing whitespace
        $content = preg_replace('/^\s*/m', '', $content);
        $content = preg_replace('/\s*$/m', '', $content);

        // replace newlines with a single space
        $content = preg_replace('/\s+/', ' ', $content);

        // remove whitespace around meta characters
        // inspired by stackoverflow.com/questions/15195750/minify-compress-css-with-regex
        $content = preg_replace('/\s*([\*$~^|]?+=|[{};,>~]|!important\b)\s*/', '$1', $content);
        $content = preg_replace('/([\[(:])\s+/', '$1', $content);
        $content = preg_replace('/\s+([\]\)])/', '$1', $content);
        $content = preg_replace('/\s+(:)(?![^\}]*\{)/', '$1', $content);

        // whitespace around + and - can only be stripped in selectors, like
        // :nth-child(3+2n), not in things like calc(3px + 2px) or shorthands
        // like 3px -2px
        $content = preg_replace('/\s*([+-])\s*(?=[^}]*{)/', '$1', $content);

        // remove semicolon/whitespace followed by closing bracket
        $content = str_replace(';}', '}', $content);

        return trim($content);
    }

    /**
     * Check if file is small enough to be imported.
     *
     * @param string $path The path to the file
     *
     * @return bool
     */
    protected function canImportBySize($path)
    {
        return ($size = @filesize($path)) && $size <= $this->maxImportSize * 1024;
    }

    /**
     * Check if file a file can be imported, going by the path.
     *
     * @param string $path
     *
     * @return bool
     */
    protected function canImportByPath($path)
    {
        return preg_match('/^(data:|https?:|\\/)/', $path) === 0;
    }
}


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 string $content Nearly finished CSS content
73			*
74			* @return string
75			*/
76			protected function moveImportsToTop($content)
77			{
78			if (preg_match_all('/@import[^;]+;/', $content, $matches)) {
79			// remove from content
80			foreach ($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			* @param string[] $parents Parent paths, for circular reference checks
100			*
101			* @return string
102			*
103			* @throws FileImportException
104			*/
105			protected function combineImports($source, $content, $parents)
106			{
107			$importRegexes = array(
108			// @import url(xxx)
109			'/
110			# import statement
111			@import
112
113			# whitespace
114			\s+
115
116			# open url()
117			url\(
118
119			# (optional) open path enclosure
120			(?P<quotes>["\']?)
121
122			# fetch path
123			(?P<path>
124
125			# do not fetch data uris, external sources or absolute paths
126			(?!(
127			["\']?
128			(data:\|https?:\\/\\/\|\\/)
129			))
130
131			.+?
132			)
133
134			# (optional) close path enclosure
135			(?P=quotes)
136
137			# close url()
138			\)
139
140			# (optional) trailing whitespace
141			\s*
142
143			# (optional) media statement(s)
144			(?P<media>[^;]*)
145
146			# (optional) trailing whitespace
147			\s*
148
149			# (optional) closing semi-colon
150			;?
151
152			/ix',
153
154			// @import 'xxx'
155			'/
156
157			# import statement
158			@import
159
160			# whitespace
161			\s+
162
163			# open path enclosure
164			(?P<quotes>["\'])
165
166			# fetch path
167			(?P<path>
168
169			# do not fetch data uris, external sources or absolute paths
170			(?!(
171			["\']?
172			(data:\|https?:\\/\\/\|\\/)
173			))
174
175			.+?
176			)
177
178			# close path enclosure
179			(?P=quotes)
180
181			# (optional) trailing whitespace
182			\s*
183
184			# (optional) media statement(s)
185			(?P<media>[^;]*)
186
187			# (optional) trailing whitespace
188			\s*
189
190			# (optional) closing semi-colon
191			;?
192
193			/ix',
194			);
195
196			// find all relative imports in css
197			$matches = array();
198			foreach ($importRegexes as $importRegex) {
199			if (preg_match_all($importRegex, $content, $regexMatches, PREG_SET_ORDER)) {
200			$matches = array_merge($matches, $regexMatches);
201			}
202			}
203
204			$search = array();
205			$replace = array();
206
207			// loop the matches
208			foreach ($matches as $match) {
209			// get the path for the file that will be imported
210			$importPath = dirname($source).'/'.$match['path'];
211
212			// only replace the import with the content if we can grab the
213			// content of the file
214			if (!$this->canImportByPath($match['path']) \|\| !$this->canImportFile($importPath)) {
215			continue;
216			}
217
218			// check if current file was not imported previously in the same
219			// import chain.
220			if (in_array($importPath, $parents)) {
221			throw new FileImportException('Failed to import file "'.$importPath.'": circular reference detected.');
222			}
223
224			// grab referenced file & minify it (which may include importing
225			// yet other @import statements recursively)
226			$minifier = new static($importPath);
227			$importContent = $minifier->execute($source, $parents);
228
229			// check if this is only valid for certain media
230			if (!empty($match['media'])) {
231			$importContent = '@media '.$match['media'].'{'.$importContent.'}';
232			}
233
234			// add to replacement array
235			$search[] = $match[0];
236			$replace[] = $importContent;
237			}
238
239			// replace the import statements
240			return str_replace($search, $replace, $content);
241			}
242
243			/**
244			* Import files into the CSS, base64-ized.
245			*
246			* @url(image.jpg) images will be loaded and their content merged into the
247			* original file, to save HTTP requests.
248			*
249			* @param string $source The file to import files for
250			* @param string $content The CSS content to import files for
251			*
252			* @return string
253			*/
254			protected function importFiles($source, $content)
255			{
256			$extensions = array_keys($this->importExtensions);
257			$regex = '/url\((["\']?)(.*?\.('.implode('\|', $extensions).'))\\1\)/i';
258			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...
259			$search = array();
260			$replace = array();
261
262			// loop the matches
263			foreach ($matches as $match) {
264			// get the path for the file that will be imported
265			$path = $match[2];
266			$path = dirname($source).'/'.$path;
267			$extension = $match[3];
268
269			// only replace the import with the content if we're able to get
270			// the content of the file, and it's relatively small
271			if ($this->canImportByPath($match[2]) && $this->canImportFile($path) && $this->canImportBySize($path)) {
272			// grab content && base64-ize
273			$importContent = $this->load($path);
274			$importContent = base64_encode($importContent);
275
276			// build replacement
277			$search[] = $match[0];
278			$replace[] = 'url('.$this->importExtensions[$extension].';base64,'.$importContent.')';
279			}
280			}
281
282			// replace the import statements
283			$content = str_replace($search, $replace, $content);
284			}
285
286			return $content;
287			}
288
289			/**
290			* Minify the data.
291			* Perform CSS optimizations.
292			*
293			* @param string[optional] $path Path to write the data to
294			* @param string[] $parents Parent paths, for circular reference checks
295			*
296			* @return string The minified data
297			*/
298			public function execute($path = null, $parents = array())
299			{
300			$content = '';
301
302			// loop css data (raw data and files)
303			foreach ($this->data as $source => $css) {
304			/*
305			* Let's first take out strings & comments, since we can't just remove
306			* whitespace anywhere. If whitespace occurs inside a string, we should
307			* leave it alone. E.g.:
308			* p { content: "a test" }
309			*/
310			$this->extractStrings();
311			$this->stripComments();
312			$css = $this->replace($css);
313
314			$css = $this->stripWhitespace($css);
315			$css = $this->shortenHex($css);
316			$css = $this->shortenZeroes($css);
317			$css = $this->shortenFontWeights($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\(
376
377			\s*
378
379			# open path enclosure
380			(?P<quotes>["\'])?
381
382			# fetch path
383			(?P<path>.+?)
384
385			# close path enclosure
386			(?(quotes)(?P=quotes))
387
388			\s*
389
390			# close url()
391			\)
392
393			/ix',
394
395			// @import "xxx"
396			'/
397			# import statement
398			@import
399
400			# whitespace
401			\s+
402
403			# we don\'t have to check for @import url(), because the
404			# condition above will already catch these
405
406			# open path enclosure
407			(?P<quotes>["\'])
408
409			# fetch path
410			(?P<path>.+?)
411
412			# close path enclosure
413			(?P=quotes)
414
415			/ix',
416			);
417
418			// find all relative urls in css
419			$matches = array();
420			foreach ($relativeRegexes as $relativeRegex) {
421			if (preg_match_all($relativeRegex, $content, $regexMatches, PREG_SET_ORDER)) {
422			$matches = array_merge($matches, $regexMatches);
423			}
424			}
425
426			$search = array();
427			$replace = array();
428
429			// loop all urls
430			foreach ($matches as $match) {
431			// determine if it's a url() or an @import match
432			$type = (strpos($match[0], '@import') === 0 ? 'import' : 'url');
433
434			$url = $match['path'];
435			if ($this->canImportByPath($url)) {
436			// attempting to interpret GET-params makes no sense, so let's discard them for awhile
437			$params = strrchr($url, '?');
438			$url = $params ? substr($url, 0, -strlen($params)) : $url;
439
440			// fix relative url
441			$url = $converter->convert($url);
442
443			// now that the path has been converted, re-apply GET-params
444			$url .= $params;
445			}
446
447			// build replacement
448			$search[] = $match[0];
449			if ($type === 'url') {
450			$replace[] = 'url('.$url.')';
451			} elseif ($type === 'import') {
452			$replace[] = '@import "'.$url.'"';
453			}
454			}
455
456			// replace urls
457			return str_replace($search, $replace, $content);
458			}
459
460			/**
461			* Shorthand hex color codes.
462			* #FF0000 -> #F00.
463			*
464			* @param string $content The CSS content to shorten the hex color codes for
465			*
466			* @return string
467			*/
468			protected function shortenHex($content)
469			{
470			$content = preg_replace('/(?<=[: ])#([0-9a-z])\\1([0-9a-z])\\2([0-9a-z])\\3(?=[; }])/i', '#$1$2$3', $content);
471
472			// we can shorten some even more by replacing them with their color name
473			$colors = array(
474			'#F0FFFF' => 'azure',
475			'#F5F5DC' => 'beige',
476			'#A52A2A' => 'brown',
477			'#FF7F50' => 'coral',
478			'#FFD700' => 'gold',
479			'#808080' => 'gray',
480			'#008000' => 'green',
481			'#4B0082' => 'indigo',
482			'#FFFFF0' => 'ivory',
483			'#F0E68C' => 'khaki',
484			'#FAF0E6' => 'linen',
485			'#800000' => 'maroon',
486			'#000080' => 'navy',
487			'#808000' => 'olive',
488			'#CD853F' => 'peru',
489			'#FFC0CB' => 'pink',
490			'#DDA0DD' => 'plum',
491			'#800080' => 'purple',
492			'#F00' => 'red',
493			'#FA8072' => 'salmon',
494			'#A0522D' => 'sienna',
495			'#C0C0C0' => 'silver',
496			'#FFFAFA' => 'snow',
497			'#D2B48C' => 'tan',
498			'#FF6347' => 'tomato',
499			'#EE82EE' => 'violet',
500			'#F5DEB3' => 'wheat',
501			);
502
503			return preg_replace_callback(
504			'/(?<=[: ])('.implode(array_keys($colors), '\|').')(?=[; }])/i',
505			function ($match) use ($colors) {
506			return $colors[strtoupper($match[0])];
507			},
508			$content
509			);
510			}
511
512			/**
513			* Shorten CSS font weights.
514			*
515			* @param string $content The CSS content to shorten the font weights for
516			*
517			* @return string
518			*/
519			protected function shortenFontWeights($content)
520			{
521			$weights = array(
522			'normal' => 400,
523			'bold' => 700,
524			);
525
526			$callback = function ($match) use ($weights) {
527			return $match[1].$weights[$match[2]];
528			};
529
530			return preg_replace_callback('/(font-weight\s:\s)('.implode('\|', array_keys($weights)).')(?=[;}])/', $callback, $content);
531			}
532
533			/**
534			* Shorthand 0 values to plain 0, instead of e.g. -0em.
535			*
536			* @param string $content The CSS content to shorten the zero values for
537			*
538			* @return string
539			*/
540			protected function shortenZeroes($content)
541			{
542			// reusable bits of code throughout these regexes:
543			// before & after are used to make sure we don't match lose unintended
544			// 0-like values (e.g. in #000, or in http://url/1.0)
545			// units can be stripped from 0 values, or used to recognize non 0
546			// values (where wa may be able to strip a .0 suffix)
547			$before = '(?<=[:(, ])';
548			$after = '(?=[ ,);}])';
549			$units = '(em\|ex\|%\|px\|cm\|mm\|in\|pt\|pc\|ch\|rem\|vh\|vw\|vmin\|vmax\|vm)';
550
551			// strip units after zeroes (0px -> 0)
552			// NOTE: it should be safe to remove all units for a 0 value, but in
553			// practice, Webkit (especially Safari) seems to stumble over at least
554			// 0%, potentially other units as well. Only stripping 'px' for now.
555			// @see https://github.com/matthiasmullie/minify/issues/60
556			$content = preg_replace('/'.$before.'(-?0*(\.0+)?)(?<=0)px'.$after.'/', '\\1', $content);
557
558			// strip 0-digits (.0 -> 0)
559			$content = preg_replace('/'.$before.'\.0+'.$units.'?'.$after.'/', '0\\1', $content);
560			// strip trailing 0: 50.10 -> 50.1, 50.10px -> 50.1px
561			$content = preg_replace('/'.$before.'(-?[0-9]+\.[0-9]+)0+'.$units.'?'.$after.'/', '\\1\\2', $content);
562			// strip trailing 0: 50.00 -> 50, 50.00px -> 50px
563			$content = preg_replace('/'.$before.'(-?[0-9]+)\.0+'.$units.'?'.$after.'/', '\\1\\2', $content);
564			// strip leading 0: 0.1 -> .1, 01.1 -> 1.1
565			$content = preg_replace('/'.$before.'(-?)0+([0-9]*\.[0-9]+)'.$units.'?'.$after.'/', '\\1\\2\\3', $content);
566
567			// strip negative zeroes (-0 -> 0) & truncate zeroes (00 -> 0)
568			$content = preg_replace('/'.$before.'-?0+'.$units.'?'.$after.'/', '0\\1', $content);
569
570			// remove zeroes where they make no sense in calc: e.g. calc(100px - 0)
571			// the 0 doesn't have any effect, and this isn't even valid without unit
572			// strip all `+ 0` or `- 0` occurrences: calc(10% + 0) -> calc(10%)
573			// looped because there may be multiple 0s inside 1 group of parentheses
574			do {
575			$previous = $content;
576			$content = preg_replace('/\(([^\(\)]+)\s+[\+\-]\s+0(\s+[^\(\)]+)?\)/', '(\\1\\2)', $content);
577			} while ($content !== $previous);
578			// strip all `0 +` occurrences: calc(0 + 10%) -> calc(10%)
579			$content = preg_replace('/\(\s*0\s+\+\s+([^\(\)]+)\)/', '(\\1)', $content);
580			// strip all `0 -` occurrences: calc(0 - 10%) -> calc(-10%)
581			$content = preg_replace('/\(\s*0\s+\-\s+([^\(\)]+)\)/', '(-\\1)', $content);
582			// I'm not going to attempt to optimize away `x * 0` instances:
583			// it's dumb enough code already that it likely won't occur, and it's
584			// too complex to do right (order of operations would have to be
585			// respected etc)
586			// what I cared about most here was fixing incorrectly truncated units
587
588			return $content;
589			}
590
591			/**
592			* Strip comments from source code.
593			*
594			* @param string $content
595			*
596			* @return string
597			*/
598			protected function stripEmptyTags($content)
599			{
600			return preg_replace('/(^\|\}\|;)[^\{\};]+\{\s*\}/', '\\1', $content);
601			}
602
603			/**
604			* Strip comments from source code.
605			*/
606			protected function stripComments()
607			{
608			$this->registerPattern('/\/\.?\*\//s', '');
609			}
610
611			/**
612			* Strip whitespace.
613			*
614			* @param string $content The CSS content to strip the whitespace for
615			*
616			* @return string
617			*/
618			protected function stripWhitespace($content)
619			{
620			// remove leading & trailing whitespace
621			$content = preg_replace('/^\s*/m', '', $content);
622			$content = preg_replace('/\s*$/m', '', $content);
623
624			// replace newlines with a single space
625			$content = preg_replace('/\s+/', ' ', $content);
626
627			// remove whitespace around meta characters
628			// inspired by stackoverflow.com/questions/15195750/minify-compress-css-with-regex
629			$content = preg_replace('/\s([\$~^\|]?+=\|[{};,>~]\|!important\b)\s*/', '$1', $content);
630			$content = preg_replace('/([\[(:])\s+/', '$1', $content);
631			$content = preg_replace('/\s+([\]\)])/', '$1', $content);
632			$content = preg_replace('/\s+(:)(?![^\}]*\{)/', '$1', $content);
633
634			// whitespace around + and - can only be stripped in selectors, like
635			// :nth-child(3+2n), not in things like calc(3px + 2px) or shorthands
636			// like 3px -2px
637			$content = preg_replace('/\s([+-])\s(?=[^}]*{)/', '$1', $content);
638
639			// remove semicolon/whitespace followed by closing bracket
640			$content = str_replace(';}', '}', $content);
641
642			return trim($content);
643			}
644
645			/**
646			* Check if file is small enough to be imported.
647			*
648			* @param string $path The path to the file
649			*
650			* @return bool
651			*/
652			protected function canImportBySize($path)
653			{
654			return ($size = @filesize($path)) && $size <= $this->maxImportSize * 1024;
655			}
656
657			/**
658			* Check if file a file can be imported, going by the path.
659			*
660			* @param string $path
661			*
662			* @return bool
663			*/
664			protected function canImportByPath($path)
665			{
666			return preg_match('/^(data:\|https?:\|\\/)/', $path) === 0;
667			}
668			}
669

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