Compressor::loadCss() - Code Metrics - gplcart/compressor - Measure and Improve Code Quality continuously with Scrutinizer

Compressor::loadCss() B
last analyzed 2018-03-09 14:01 UTC

↳ Parent: Compressor

Complexity

Conditions	6
Paths	16

Size

Total Lines	37
Code Lines	15

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	37
rs	8.439
c	0
b	0
f	0
cc	6
eloc	15
nc	16
nop	3

<?php

/**
 * @package Compressor
 * @author Iurii Makukh <[email protected]>
 * @copyright Copyright (c) 2018, Iurii Makukh <[email protected]>
 * @license https://www.gnu.org/licenses/gpl-3.0.en.html GPL-3.0-or-later
 */

namespace gplcart\modules\compressor\helpers;

use InvalidArgumentException;
use RuntimeException;
use UnexpectedValueException;

/**
 * Aggregates and minifies CSS/JS files
 * Inspired by Drupal's aggregator
 */
class Compressor
{

    /**
     * Base URL path
     * @var string
     */
    protected $base;

    /**
     * Base path for CSS url() attribute
     * @var string
     */
    protected $base_css;

    /**
     * Whether to optimize a CSS file
     * @var bool
     */
    protected $optimize_css;

    /**
     * Sets base URL path
     * @param $url
     * @return $this
     */
    public function setBase($url)
    {
        $this->base = $url;
        return $this;
    }

    /**
     * Aggregate an array of scripts into one compressed file
     * @param array $files
     * @param string $directory
     * @return string
     */
    public function getJs(array $files, $directory)
    {
        $key = $this->getKey($files);

        $filename = "js_$key.js";
        $uri = "$directory/$filename";

        if (file_exists($uri)) {
            return $uri;
        }

        $data = '';

        foreach ($files as $file) {
            $contents = file_get_contents($file);
            $contents .= ";\n";
            $data .= $contents;
        }

        $this->write($directory, $filename, $data);
        return $uri;
    }

    /**
     * Aggregate an array of stylesheets into one compressed file
     * @param array $files
     * @param string $directory
     * @return string
     * @throws InvalidArgumentException
     */
    public function getCss(array $files, $directory)
    {
        $key = $this->getKey($files);
        $filename = "css_$key.css";
        $uri = "$directory/$filename";

        if (file_exists($uri)) {
            return $uri;
        }

        if (!isset($this->base)) {
            throw new InvalidArgumentException('Base URL is not set');
        }

        $data = '';

        foreach ($files as $file) {

            $contents = $this->loadCss($file, true);

            // Build the base URL of this CSS file: start with the full URL.
            $url = "{$this->base}$file";

            // Move to the parent.
            $url = substr($url, 0, strrpos($url, '/'));

            $this->buildPathCss(null, "$url/");

            // Anchor all paths in the CSS with its base URL, ignoring external and absolute paths.
            $pattern = '/url\(\s*[\'"]?(?![a-z]+:|\/+)([^\'")]+)[\'"]?\s*\)/i';
            $data .= preg_replace_callback($pattern, array($this, 'buildPathCss'), $contents);
        }

        // Per the W3C specification at http://www.w3.org/TR/REC-CSS2/cascade.html#at-import,
        // @import rules must proceed any other style, so we move those to the top.
        $regexp = '/@import[^;]+;/i';
        preg_match_all($regexp, $data, $matches);

        $data = preg_replace($regexp, '', $data);
        $data = implode('', $matches[0]) . $data;

        $this->write($directory, $filename, $data);
        return $uri;
    }

    /**
     * Processes the contents of a stylesheet for aggregation.
     * @param string $contents
     * @param bool $optimize
     * @return string
     * @todo remove second argument
     */
    protected function processCss($contents, $optimize = false)
    {
        // Remove multiple charset declarations for standards compliance (and fixing Safari problems).
        $contents = preg_replace('/^@charset\s+[\'"](\S*?)\b[\'"];/i', '', $contents);

        if ($optimize) {
            $contents = $this->optimizeCss($contents);
        }

        // Replaces @import commands with the actual stylesheet content.
        // This happens recursively but omits external files.
        $pattern = '/@import\s*(?:url\(\s*)?[\'"]?(?![a-z]+:)(?!\/\/)([^\'"\()]+)[\'"]?\s*\)?\s*;/';
        return preg_replace_callback($pattern, array($this, 'prepareCss'), $contents);
    }

    /**
     * Loads stylesheets recursively and returns contents with corrected paths.
     * @param array $matches
     * @return string
     */
    protected function prepareCss($matches)
    {
        $filename = $matches[1];

        // Load the imported stylesheet and replace @import commands in there as well.
        $file = $this->loadCss($filename, null, false);

        // Determine the file's directory.
        $directory = dirname($filename);

        // If the file is in the current directory, make sure '.' doesn't appear in
        // the url() path.
        $directory = $directory == '.' ? '' : $directory . '/';

        // Alter all internal url() paths. Leave external paths alone. We don't need
        // to normalize absolute paths here (i.e. remove folder/... segments) because
        // that will be done later.
        $pattern = '/url\(\s*([\'"]?)(?![a-z]+:|\/+)([^\'")]+)([\'"]?)\s*\)/i';

        return preg_replace($pattern, 'url(\1' . $directory . '\2\3)', $file);
    }

    /**
     * Loads the stylesheet and resolves all @import commands.
     * @param string $file
     * @param null|boolean $optimize
     * @param bool $reset_basepath
     * @return string
     * @throws UnexpectedValueException
     */
    public function loadCss($file, $optimize = null, $reset_basepath = true)
    {
        if ($reset_basepath) {
            $this->base_css = '';
        }

        // Store the value of $optimize_css for preg_replace_callback with nested
        // @import loops.
        if (isset($optimize)) {
            $this->optimize_css = $optimize;
        }

        // Stylesheets are relative one to each other. Start by adding a base path
        // prefix provided by the parent stylesheet (if necessary).
        if ($this->base_css && strpos($file, '://') === false) {
            $file = "{$this->base_css}/$file";
        }

        // Store the parent base path to restore it later.
        $parent_base_path = $this->base_css;

        // Set the current base path to process possible child imports.
        $this->base_css = dirname($file);

        // Load the CSS stylesheet
        $contents = file_get_contents($file);

        if ($contents === false) {
            throw new UnexpectedValueException("Failed to read file $file");
        }

        $result = $this->processCss($contents, $this->optimize_css);

        // Restore the parent base path as the file and its childen are processed.
        $this->base_css = $parent_base_path;
        return $result;
    }

    /**
     * Performs some safe CSS optimizations
     * @param string $contents
     * @return string
     */
    public function optimizeCss($contents)
    {
        // Regexp to match comment blocks.
        $comment = '/\*[^*]*\*+(?:[^/*][^*]*\*+)*/';

        // Regexp to match double quoted strings.
        $double_quot = '"[^"\\\\]*(?:\\\\.[^"\\\\]*)*"';

        // Regexp to match single quoted strings.
        $single_quot = "'[^'\\\\]*(?:\\\\.[^'\\\\]*)*'";

        // Strip all comment blocks, but keep double/single quoted strings.
        $contents = preg_replace(
            "<($double_quot|$single_quot)|$comment>Ss", "$1", $contents
        );

        // Remove certain whitespace.
        // There are different conditions for removing leading and trailing
        // whitespace.
        // @see http://php.net/manual/regexp.reference.subpatterns.php
        $contents = preg_replace('<
                # Strip leading and trailing whitespace.
                \s*([@{};,])\s*
                # Strip only leading whitespace from:
                # - Closing parenthesis: Retain "@media (bar) and foo".
                | \s+([\)])
                # Strip only trailing whitespace from:
                # - Opening parenthesis: Retain "@media (bar) and foo".
                # - Colon: Retain :pseudo-selectors.
                | ([\(:])\s+
                >xS',
            // Only one of the three capturing groups will match, so its reference
            // will contain the wanted value and the references for the
            // two non-matching groups will be replaced with empty strings.
            '$1$2$3', $contents
        );

        // End the file with a new line.
        $contents = trim($contents);
        $contents .= "\n";

        return $contents;
    }

    /**
     * Prefixes all paths within a CSS file
     * @param array|null $matches
     * @param null|string $basepath
     * @return string
     */
    protected function buildPathCss($matches, $basepath = null)
    {
        // Store base path for preg_replace_callback.
        if (isset($basepath)) {
            $this->base_css = $basepath;
        }

        // Prefix with base and remove '../' segments where possible.
        $path = $this->base_css . $matches[1];

        $last = '';

        while ($path != $last) {
            $last = $path;
            $path = preg_replace('`(^|/)(?!\.\./)([^/]+)/\.\./`', '$1', $path);
        }

        return 'url(' . $path . ')';
    }

    /**
     * Creates a unique key from an array of files
     * @param array $files
     * @return string
     */
    protected function getKey(array $files)
    {
        return md5(json_encode($files));
    }

    /**
     * Writes an aggregated data to a file
     * @param string $directory
     * @param string $filename
     * @param string $data
     * @throws RuntimeException
     */
    protected function write($directory, $filename, $data)
    {
        if (!file_exists($directory) && !mkdir($directory, 0775, true)) {
            throw new RuntimeException("Failed to create directory $directory");
        }

        $file = "$directory/$filename";

        if (file_put_contents($file, $data) === false) {
            throw new RuntimeException("Failed to write to file $file");
        }
    }

}


1			<?php
2
3			/**
4			* @package Compressor
5			* @author Iurii Makukh <[email protected]>
6			* @copyright Copyright (c) 2018, Iurii Makukh <[email protected]>
7			* @license https://www.gnu.org/licenses/gpl-3.0.en.html GPL-3.0-or-later
8			*/
9
10			namespace gplcart\modules\compressor\helpers;
11
12			use InvalidArgumentException;
13			use RuntimeException;
14			use UnexpectedValueException;
15
16			/**
17			* Aggregates and minifies CSS/JS files
18			* Inspired by Drupal's aggregator
19			*/
20			class Compressor
21			{
22
23			/**
24			* Base URL path
25			* @var string
26			*/
27			protected $base;
28
29			/**
30			* Base path for CSS url() attribute
31			* @var string
32			*/
33			protected $base_css;
34
35			/**
36			* Whether to optimize a CSS file
37			* @var bool
38			*/
39			protected $optimize_css;
40
41			/**
42			* Sets base URL path
43			* @param $url
44			* @return $this
45			*/
46			public function setBase($url)
47			{
48			$this->base = $url;
49			return $this;
50			}
51
52			/**
53			* Aggregate an array of scripts into one compressed file
54			* @param array $files
55			* @param string $directory
56			* @return string
57			*/
58			public function getJs(array $files, $directory)
59			{
60			$key = $this->getKey($files);
61
62			$filename = "js_$key.js";
63			$uri = "$directory/$filename";
64
65			if (file_exists($uri)) {
66			return $uri;
67			}
68
69			$data = '';
70
71			foreach ($files as $file) {
72			$contents = file_get_contents($file);
73			$contents .= ";\n";
74			$data .= $contents;
75			}
76
77			$this->write($directory, $filename, $data);
78			return $uri;
79			}
80
81			/**
82			* Aggregate an array of stylesheets into one compressed file
83			* @param array $files
84			* @param string $directory
85			* @return string
86			* @throws InvalidArgumentException
87			*/
88			public function getCss(array $files, $directory)
89			{
90			$key = $this->getKey($files);
91			$filename = "css_$key.css";
92			$uri = "$directory/$filename";
93
94			if (file_exists($uri)) {
95			return $uri;
96			}
97
98			if (!isset($this->base)) {
99			throw new InvalidArgumentException('Base URL is not set');
100			}
101
102			$data = '';
103
104			foreach ($files as $file) {
105
106			$contents = $this->loadCss($file, true);
107
108			// Build the base URL of this CSS file: start with the full URL.
109			$url = "{$this->base}$file";
110
111			// Move to the parent.
112			$url = substr($url, 0, strrpos($url, '/'));
113
114			$this->buildPathCss(null, "$url/");
115
116			// Anchor all paths in the CSS with its base URL, ignoring external and absolute paths.
117			$pattern = '/url\(\s[\'"]?(?![a-z]+:\|\/+)([^\'")]+)[\'"]?\s\)/i';
118			$data .= preg_replace_callback($pattern, array($this, 'buildPathCss'), $contents);
119			}
120
121			// Per the W3C specification at http://www.w3.org/TR/REC-CSS2/cascade.html#at-import,
122			// @import rules must proceed any other style, so we move those to the top.
123			$regexp = '/@import[^;]+;/i';
124			preg_match_all($regexp, $data, $matches);
125
126			$data = preg_replace($regexp, '', $data);
127			$data = implode('', $matches[0]) . $data;
128
129			$this->write($directory, $filename, $data);
130			return $uri;
131			}
132
133			/**
134			* Processes the contents of a stylesheet for aggregation.
135			* @param string $contents
136			* @param bool $optimize
137			* @return string
138			* @todo remove second argument
139			*/
140			protected function processCss($contents, $optimize = false)
141			{
142			// Remove multiple charset declarations for standards compliance (and fixing Safari problems).
143			$contents = preg_replace('/^@charset\s+[\'"](\S*?)\b[\'"];/i', '', $contents);
144
145			if ($optimize) {
146			$contents = $this->optimizeCss($contents);
147			}
148
149			// Replaces @import commands with the actual stylesheet content.
150			// This happens recursively but omits external files.
151			$pattern = '/@import\s(?:url\(\s)?[\'"]?(?![a-z]+:)(?!\/\/)([^\'"\()]+)[\'"]?\s\)?\s;/';
152			return preg_replace_callback($pattern, array($this, 'prepareCss'), $contents);
153			}
154
155			/**
156			* Loads stylesheets recursively and returns contents with corrected paths.
157			* @param array $matches
158			* @return string
159			*/
160			protected function prepareCss($matches)
161			{
162			$filename = $matches[1];
163
164			// Load the imported stylesheet and replace @import commands in there as well.
165			$file = $this->loadCss($filename, null, false);
166
167			// Determine the file's directory.
168			$directory = dirname($filename);
169
170			// If the file is in the current directory, make sure '.' doesn't appear in
171			// the url() path.
172			$directory = $directory == '.' ? '' : $directory . '/';
173
174			// Alter all internal url() paths. Leave external paths alone. We don't need
175			// to normalize absolute paths here (i.e. remove folder/... segments) because
176			// that will be done later.
177			$pattern = '/url\(\s([\'"]?)(?![a-z]+:\|\/+)([^\'")]+)([\'"]?)\s\)/i';
178
179			return preg_replace($pattern, 'url(\1' . $directory . '\2\3)', $file);
180			}
181
182			/**
183			* Loads the stylesheet and resolves all @import commands.
184			* @param string $file
185			* @param null\|boolean $optimize
186			* @param bool $reset_basepath
187			* @return string
188			* @throws UnexpectedValueException
189			*/
190			public function loadCss($file, $optimize = null, $reset_basepath = true)
191			{
192			if ($reset_basepath) {
193			$this->base_css = '';
194			}
195
196			// Store the value of $optimize_css for preg_replace_callback with nested
197			// @import loops.
198			if (isset($optimize)) {
199			$this->optimize_css = $optimize;
200			}
201
202			// Stylesheets are relative one to each other. Start by adding a base path
203			// prefix provided by the parent stylesheet (if necessary).
204			if ($this->base_css && strpos($file, '://') === false) {
205			$file = "{$this->base_css}/$file";
206			}
207
208			// Store the parent base path to restore it later.
209			$parent_base_path = $this->base_css;
210
211			// Set the current base path to process possible child imports.
212			$this->base_css = dirname($file);
213
214			// Load the CSS stylesheet
215			$contents = file_get_contents($file);
216
217			if ($contents === false) {
218			throw new UnexpectedValueException("Failed to read file $file");
219			}
220
221			$result = $this->processCss($contents, $this->optimize_css);
222
223			// Restore the parent base path as the file and its childen are processed.
224			$this->base_css = $parent_base_path;
225			return $result;
226			}
227
228			/**
229			* Performs some safe CSS optimizations
230			* @param string $contents
231			* @return string
232			*/
233			public function optimizeCss($contents)
234			{
235			// Regexp to match comment blocks.
236			$comment = '/\[^]\+(?:[^/][^]\+)*/';
237
238			// Regexp to match double quoted strings.
239			$double_quot = '"[^"\\\\](?:\\\\.[^"\\\\])*"';
240
241			// Regexp to match single quoted strings.
242			$single_quot = "'[^'\\\\](?:\\\\.[^'\\\\])*'";
243
244			// Strip all comment blocks, but keep double/single quoted strings.
245			$contents = preg_replace(
246			"<($double_quot\|$single_quot)\|$comment>Ss", "$1", $contents
247			);
248
249			// Remove certain whitespace.
250			// There are different conditions for removing leading and trailing
251			// whitespace.
252			// @see http://php.net/manual/regexp.reference.subpatterns.php
253			$contents = preg_replace('<
254			# Strip leading and trailing whitespace.
255			\s([@{};,])\s
256			# Strip only leading whitespace from:
257			# - Closing parenthesis: Retain "@media (bar) and foo".
258			\| \s+([\)])
259			# Strip only trailing whitespace from:
260			# - Opening parenthesis: Retain "@media (bar) and foo".
261			# - Colon: Retain :pseudo-selectors.
262			\| ([\(:])\s+
263			>xS',
264			// Only one of the three capturing groups will match, so its reference
265			// will contain the wanted value and the references for the
266			// two non-matching groups will be replaced with empty strings.
267			'$1$2$3', $contents
268			);
269
270			// End the file with a new line.
271			$contents = trim($contents);
272			$contents .= "\n";
273
274			return $contents;
275			}
276
277			/**
278			* Prefixes all paths within a CSS file
279			* @param array\|null $matches
280			* @param null\|string $basepath
281			* @return string
282			*/
283			protected function buildPathCss($matches, $basepath = null)
284			{
285			// Store base path for preg_replace_callback.
286			if (isset($basepath)) {
287			$this->base_css = $basepath;
288			}
289
290			// Prefix with base and remove '../' segments where possible.
291			$path = $this->base_css . $matches[1];
292
293			$last = '';
294
295			while ($path != $last) {
296			$last = $path;
297			$path = preg_replace('`(^\|/)(?!\.\./)([^/]+)/\.\./`', '$1', $path);
298			}
299
300			return 'url(' . $path . ')';
301			}
302
303			/**
304			* Creates a unique key from an array of files
305			* @param array $files
306			* @return string
307			*/
308			protected function getKey(array $files)
309			{
310			return md5(json_encode($files));
311			}
312
313			/**
314			* Writes an aggregated data to a file
315			* @param string $directory
316			* @param string $filename
317			* @param string $data
318			* @throws RuntimeException
319			*/
320			protected function write($directory, $filename, $data)
321			{
322			if (!file_exists($directory) && !mkdir($directory, 0775, true)) {
323			throw new RuntimeException("Failed to create directory $directory");
324			}
325
326			$file = "$directory/$filename";
327
328			if (file_put_contents($file, $data) === false) {
329			throw new RuntimeException("Failed to write to file $file");
330			}
331			}
332
333			}
334

gplcart / compressor

Compressor::loadCss() B last analyzed 2018-03-09 14:01 UTC

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Compressor::loadCss() B
last analyzed 2018-03-09 14:01 UTC