Minify::extractStrings() - Code Metrics - Inspection of "Option for keep preserved comments. Cli command wi..." - matthiasmullie/minify - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#177)

unknown

created 2017-05-07 02:04 UTC

Minify::extractStrings() B

↳ Parent: Minify

Complexity

Conditions	2
Paths	1

Size

Total Lines	37
Code Lines	10

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	37
rs	8.8571
c	0
b	0
f	0
cc	2
eloc	10
nc	1
nop	1

<?php

namespace MatthiasMullie\Minify;

use MatthiasMullie\Minify\Exceptions\IOException;
use Psr\Cache\CacheItemInterface;

/**
 * Abstract minifier class.
 *
 * Please report bugs on https://github.com/matthiasmullie/minify/issues
 *
 * @author Matthias Mullie <[email protected]>
 * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
 * @license MIT License
 */
abstract class Minify
{
    /**
     * Leave comment in compressed file
     * if it starts with /*! or contains @license or @preserve tags.
     *
     * @var bool
     */
    protected $leavePreservedComments = false;
    /**
     * The data to be minified.
     *
     * @var string[]
     */
    protected $data = array();

    /**
     * Array of patterns to match.
     *
     * @var string[]
     */
    protected $patterns = array();

    /**
     * This array will hold content of strings and regular expressions that have
     * been extracted from the JS source code, so we can reliably match "code",
     * without having to worry about potential "code-like" characters inside.
     *
     * @var string[]
     */
    public $extracted = array();

    /**
     * Init the minify class - optionally, code may be passed along already.
     */
    public function __construct(/* $data = null, ... */)
    {
        // it's possible to add the source through the constructor as well ;)
        if (func_num_args()) {
            call_user_func_array(array($this, 'add'), func_get_args());
        }
    }

    /**
     * Add a file or straight-up code to be minified.
     *
     * @param string|string[] $data
     *
     * @return static
     */
    public function add($data /* $data = null, ... */)
    {
        // bogus "usage" of parameter $data: scrutinizer warns this variable is
        // not used (we're using func_get_args instead to support overloading),
        // but it still needs to be defined because it makes no sense to have
        // this function without argument :)
        $args = array($data) + func_get_args();

        // this method can be overloaded
        foreach ($args as $data) {
            if (is_array($data)) {
                call_user_func_array(array($this, 'add'), $data);
                continue;
            }

            // redefine var
            $data = (string) $data;

            // load data
            $value = $this->load($data);
            $key = ($data != $value) ? $data : count($this->data);

            // replace CR linefeeds etc.
            // @see https://github.com/matthiasmullie/minify/pull/139
            $value = str_replace(array("\r\n", "\r"), "\n", $value);

            // store data
            $this->data[$key] = $value;
        }

        return $this;
    }

    /**
     * Minify the data & (optionally) saves it to a file.
     *
     * @param string[optional] $path Path to write the data to
     *
     * @return string The minified data
     */
    public function minify($path = null)
    {
        $content = $this->execute($path);

        // save to path
        if ($path !== null) {
            $this->save($content, $path);
        }

        return $content;
    }

    /**
     * Minify & gzip the data & (optionally) saves it to a file.
     *
     * @param string[optional] $path  Path to write the data to
     * @param int[optional]    $level Compression level, from 0 to 9
     *
     * @return string The minified & gzipped data
     */
    public function gzip($path = null, $level = 9)
    {
        $content = $this->execute($path);
        $content = gzencode($content, $level, FORCE_GZIP);

        // save to path
        if ($path !== null) {
            $this->save($content, $path);
        }

        return $content;
    }

    /**
     * Minify the data & write it to a CacheItemInterface object.
     *
     * @param CacheItemInterface $item Cache item to write the data to
     *
     * @return CacheItemInterface Cache item with the minifier data
     */
    public function cache(CacheItemInterface $item)
    {
        $content = $this->execute();
        $item->set($content);

        return $item;
    }

    /**
     * Minify the data.
     *
     * @param string[optional] $path Path to write the data to
     *
     * @return string The minified data
     */
    abstract public function execute($path = null);

    /**
     * Load data.
     *
     * @param string $data Either a path to a file or the content itself
     *
     * @return string
     */
    protected function load($data)
    {
        // check if the data is a file
        if ($this->canImportFile($data)) {
            $data = file_get_contents($data);

            // strip BOM, if any
            if (substr($data, 0, 3) == "\xef\xbb\xbf") {
                $data = substr($data, 3);
            }
        }

        return $data;
    }

    /**
     * Save to file.
     *
     * @param string $content The minified data
     * @param string $path    The path to save the minified data to
     *
     * @throws IOException
     */
    protected function save($content, $path)
    {
        $handler = $this->openFileForWriting($path);

        $this->writeToFile($handler, $content);

        @fclose($handler);
// For example instead of
@mkdir($dir);

// Better use
if (@mkdir($dir) === false) {
    throw new \RuntimeException('The directory '.$dir.' could not be created.');
}
    }

    /**
     * Register a pattern to execute against the source content.
     *
     * @param string          $pattern     PCRE pattern
     * @param string|callable $replacement Replacement value for matched pattern
     */
    protected function registerPattern($pattern, $replacement = '')
    {
        // study the pattern, we'll execute it more than once
        $pattern .= 'S';

        $this->patterns[] = array($pattern, $replacement);
    }

    /**
     * We can't "just" run some regular expressions against JavaScript: it's a
     * complex language. E.g. having an occurrence of // xyz would be a comment,
     * unless it's used within a string. Of you could have something that looks
     * like a 'string', but inside a comment.
     * The only way to accurately replace these pieces is to traverse the JS one
     * character at a time and try to find whatever starts first.
     *
     * @param string $content The content to replace patterns in
     *
     * @return string The (manipulated) content
     */
    protected function replace($content)
    {
        $processed = '';
        $positions = array_fill(0, count($this->patterns), -1);
        $matches = array();

        while ($content) {
            // find first match for all patterns
            foreach ($this->patterns as $i => $pattern) {
                list($pattern, $replacement) = $pattern;

                // no need to re-run matches that are still in the part of the
                // content that hasn't been processed
                if ($positions[$i] >= 0) {
                    continue;
                }

                $match = null;
                if (preg_match($pattern, $content, $match)) {
                    $matches[$i] = $match;

                    // we'll store the match position as well; that way, we
                    // don't have to redo all preg_matches after changing only
                    // the first (we'll still know where those others are)
                    $positions[$i] = strpos($content, $match[0]);
                } else {
                    // if the pattern couldn't be matched, there's no point in
                    // executing it again in later runs on this same content;
                    // ignore this one until we reach end of content
                    unset($matches[$i]);
                    $positions[$i] = strlen($content);
                }
            }

            // no more matches to find: everything's been processed, break out
            if (!$matches) {

                $processed .= $content;
                break;
            }

            // see which of the patterns actually found the first thing (we'll
            // only want to execute that one, since we're unsure if what the
            // other found was not inside what the first found)
            $discardLength = min($positions);
            $firstPattern = array_search($discardLength, $positions);
            $match = $matches[$firstPattern][0];

            // execute the pattern that matches earliest in the content string
            list($pattern, $replacement) = $this->patterns[$firstPattern];
            $replacement = $this->replacePattern($pattern, $replacement, $content);

            // figure out which part of the string was unmatched; that's the
            // part we'll execute the patterns on again next
            $content = substr($content, $discardLength);
            $unmatched = (string) substr($content, strpos($content, $match) + strlen($match));

            // move the replaced part to $processed and prepare $content to
            // again match batch of patterns against
            $processed .= substr($replacement, 0, strlen($replacement) - strlen($unmatched));
            $content = $unmatched;

            // first match has been replaced & that content is to be left alone,
            // the next matches will start after this replacement, so we should
            // fix their offsets
            foreach ($positions as $i => $position) {
                $positions[$i] -= $discardLength + strlen($match);
            }
        }

        return $processed;
    }

    /**
     * This is where a pattern is matched against $content and the matches
     * are replaced by their respective value.
     * This function will be called plenty of times, where $content will always
     * move up 1 character.
     *
     * @param string          $pattern     Pattern to match
     * @param string|callable $replacement Replacement value
     * @param string          $content     Content to match pattern against
     *
     * @return string
     */
    protected function replacePattern($pattern, $replacement, $content)
    {
        if (is_callable($replacement)) {
            return preg_replace_callback($pattern, $replacement, $content, 1, $count);
        } else {
            return preg_replace($pattern, $replacement, $content, 1, $count);
        }
    }

    /**
     * Strings are a pattern we need to match, in order to ignore potential
     * code-like content inside them, but we just want all of the string
     * content to remain untouched.
     *
     * This method will replace all string content with simple STRING#
     * placeholder text, so we've rid all strings from characters that may be
     * misinterpreted. Original string content will be saved in $this->extracted
     * and after doing all other minifying, we can restore the original content
     * via restoreStrings().
     *
     * @param string[optional] $chars
     */
    protected function extractStrings($chars = '\'"')
    {
        // PHP only supports $this inside anonymous functions since 5.4
        $minifier = $this;
        $callback = function ($match) use ($minifier) {
            // check the second index here, because the first always contains a quote
            if ($match[2] === '') {
                /*
                 * Empty strings need no placeholder; they can't be confused for
                 * anything else anyway.
                 * But we still needed to match them, for the extraction routine
                 * to skip over this particular string.
                 */
                return $match[0];
            }

            $count = count($minifier->extracted);
            $placeholder = $match[1].$count.$match[1];
            $minifier->extracted[$placeholder] = $match[1].$match[2].$match[1];

            return $placeholder;
        };

        /*
         * The \\ messiness explained:
         * * Don't count ' or " as end-of-string if it's escaped (has backslash
         * in front of it)
         * * Unless... that backslash itself is escaped (another leading slash),
         * in which case it's no longer escaping the ' or "
         * * So there can be either no backslash, or an even number
         * * multiply all of that times 4, to account for the escaping that has
         * to be done to pass the backslash into the PHP string without it being
         * considered as escape-char (times 2) and to get it in the regex,
         * escaped (times 2)
         */
        $this->registerPattern('/(['.$chars.'])(.*?(?<!\\\\)(\\\\\\\\)*+)\\1/s', $callback);
    }

    /**
     * This method will restore all extracted data (strings, regexes) that were
     * replaced with placeholder text in extract*(). The original content was
     * saved in $this->extracted.
     *
     * @param string $content
     *
     * @return string
     */
    protected function restoreExtractedData($content)
    {
        if (!$this->extracted) {

            // nothing was extracted, nothing to restore
            return $content;
        }

        $content = strtr($content, $this->extracted);

        $this->extracted = array();

        return $content;
    }

    /**
     * Check if the path is a regular file and can be read.
     *
     * @param string $path
     *
     * @return bool
     */
    protected function canImportFile($path)
    {
        return strlen($path) < PHP_MAXPATHLEN && @is_file($path) && is_readable($path);
    }

    /**
     * Attempts to open file specified by $path for writing.
     *
     * @param string $path The path to the file
     *
     * @return resource Specifier for the target file
     *
     * @throws IOException
     */
    protected function openFileForWriting($path)
    {
        if (($handler = @fopen($path, 'w')) === false) {
            throw new IOException('The file "'.$path.'" could not be opened for writing. Check if PHP has enough permissions.');
        }

        return $handler;
    }

    /**
     * Attempts to write $content to the file specified by $handler. $path is used for printing exceptions.
     *
     * @param resource $handler The resource to write to
     * @param string   $content The content to write
     * @param string   $path    The path to the file (for exception printing only)
     *
     * @throws IOException
     */
    protected function writeToFile($handler, $content, $path = '')
    {
        if (($result = @fwrite($handler, $content)) === false || ($result < strlen($content))) {
            throw new IOException('The file "'.$path.'" could not be written to. Check your disk space and file permissions.');
        }
    }

    /**
     * Set Leave comment in compressed file parameter
     * If true, minify will leave comment in compressed file
     * if it starts with /*! or contains @license or @preserve tags.
     * If false, all comments will be removed.
     *
     * @param bool $value
     */
    public function setLeavePreservedComments($value)
    {
        $this->leavePreservedComments = $value;
    }
}


1			<?php
2
3			namespace MatthiasMullie\Minify;
4
5			use MatthiasMullie\Minify\Exceptions\IOException;
6			use Psr\Cache\CacheItemInterface;
7
8			/**
9			* Abstract minifier class.
10			*
11			* Please report bugs on https://github.com/matthiasmullie/minify/issues
12			*
13			* @author Matthias Mullie <[email protected]>
14			* @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
15			* @license MIT License
16			*/
17			abstract class Minify
18			{
19			/**
20			* Leave comment in compressed file
21			* if it starts with /*! or contains @license or @preserve tags.
22			*
23			* @var bool
24			*/
25			protected $leavePreservedComments = false;
26			/**
27			* The data to be minified.
28			*
29			* @var string[]
30			*/
31			protected $data = array();
32
33			/**
34			* Array of patterns to match.
35			*
36			* @var string[]
37			*/
38			protected $patterns = array();
39
40			/**
41			* This array will hold content of strings and regular expressions that have
42			* been extracted from the JS source code, so we can reliably match "code",
43			* without having to worry about potential "code-like" characters inside.
44			*
45			* @var string[]
46			*/
47			public $extracted = array();
48
49			/**
50			* Init the minify class - optionally, code may be passed along already.
51			*/
52			public function __construct(/* $data = null, ... */)
53			{
54			// it's possible to add the source through the constructor as well ;)
55			if (func_num_args()) {
56			call_user_func_array(array($this, 'add'), func_get_args());
57			}
58			}
59
60			/**
61			* Add a file or straight-up code to be minified.
62			*
63			* @param string\|string[] $data
64			*
65			* @return static
66			*/
67			public function add($data /* $data = null, ... */)
68			{
69			// bogus "usage" of parameter $data: scrutinizer warns this variable is
70			// not used (we're using func_get_args instead to support overloading),
71			// but it still needs to be defined because it makes no sense to have
72			// this function without argument :)
73			$args = array($data) + func_get_args();
74
75			// this method can be overloaded
76			foreach ($args as $data) {
77			if (is_array($data)) {
78			call_user_func_array(array($this, 'add'), $data);
79			continue;
80			}
81
82			// redefine var
83			$data = (string) $data;
84
85			// load data
86			$value = $this->load($data);
87			$key = ($data != $value) ? $data : count($this->data);
88
89			// replace CR linefeeds etc.
90			// @see https://github.com/matthiasmullie/minify/pull/139
91			$value = str_replace(array("\r\n", "\r"), "\n", $value);
92
93			// store data
94			$this->data[$key] = $value;
95			}
96
97			return $this;
98			}
99
100			/**
101			* Minify the data & (optionally) saves it to a file.
102			*
103			* @param string[optional] $path Path to write the data to
104			*
105			* @return string The minified data
106			*/
107			public function minify($path = null)
108			{
109			$content = $this->execute($path);
110
111			// save to path
112			if ($path !== null) {
113			$this->save($content, $path);
114			}
115
116			return $content;
117			}
118
119			/**
120			* Minify & gzip the data & (optionally) saves it to a file.
121			*
122			* @param string[optional] $path Path to write the data to
123			* @param int[optional] $level Compression level, from 0 to 9
124			*
125			* @return string The minified & gzipped data
126			*/
127			public function gzip($path = null, $level = 9)
128			{
129			$content = $this->execute($path);
130			$content = gzencode($content, $level, FORCE_GZIP);
131
132			// save to path
133			if ($path !== null) {
134			$this->save($content, $path);
135			}
136
137			return $content;
138			}
139
140			/**
141			* Minify the data & write it to a CacheItemInterface object.
142			*
143			* @param CacheItemInterface $item Cache item to write the data to
144			*
145			* @return CacheItemInterface Cache item with the minifier data
146			*/
147			public function cache(CacheItemInterface $item)
148			{
149			$content = $this->execute();
150			$item->set($content);
151
152			return $item;
153			}
154
155			/**
156			* Minify the data.
157			*
158			* @param string[optional] $path Path to write the data to
159			*
160			* @return string The minified data
161			*/
162			abstract public function execute($path = null);
163
164			/**
165			* Load data.
166			*
167			* @param string $data Either a path to a file or the content itself
168			*
169			* @return string
170			*/
171			protected function load($data)
172			{
173			// check if the data is a file
174			if ($this->canImportFile($data)) {
175			$data = file_get_contents($data);
176
177			// strip BOM, if any
178			if (substr($data, 0, 3) == "\xef\xbb\xbf") {
179			$data = substr($data, 3);
180			}
181			}
182
183			return $data;
184			}
185
186			/**
187			* Save to file.
188			*
189			* @param string $content The minified data
190			* @param string $path The path to save the minified data to
191			*
192			* @throws IOException
193			*/
194			protected function save($content, $path)
195			{
196			$handler = $this->openFileForWriting($path);
197
198			$this->writeToFile($handler, $content);
199
200			@fclose($handler);
			0 ignored issues – show Security Best Practice introduced 2015-12-17 21:43 UTC by Report Bug Copy Issue Report It seems like you do not handle an error condition here. This can introduce security issues, and is generally not recommended. If you suppress an error, we recommend checking for the error condition explicitly: // For example instead of @mkdir($dir); // Better use if (@mkdir($dir) === false) { throw new \RuntimeException('The directory '.$dir.' could not be created.'); } Loading history...
201			}
202
203			/**
204			* Register a pattern to execute against the source content.
205			*
206			* @param string $pattern PCRE pattern
207			* @param string\|callable $replacement Replacement value for matched pattern
208			*/
209			protected function registerPattern($pattern, $replacement = '')
210			{
211			// study the pattern, we'll execute it more than once
212			$pattern .= 'S';
213
214			$this->patterns[] = array($pattern, $replacement);
215			}
216
217			/**
218			* We can't "just" run some regular expressions against JavaScript: it's a
219			* complex language. E.g. having an occurrence of // xyz would be a comment,
220			* unless it's used within a string. Of you could have something that looks
221			* like a 'string', but inside a comment.
222			* The only way to accurately replace these pieces is to traverse the JS one
223			* character at a time and try to find whatever starts first.
224			*
225			* @param string $content The content to replace patterns in
226			*
227			* @return string The (manipulated) content
228			*/
229			protected function replace($content)
230			{
231			$processed = '';
232			$positions = array_fill(0, count($this->patterns), -1);
233			$matches = array();
234
235			while ($content) {
236			// find first match for all patterns
237			foreach ($this->patterns as $i => $pattern) {
238			list($pattern, $replacement) = $pattern;
239
240			// no need to re-run matches that are still in the part of the
241			// content that hasn't been processed
242			if ($positions[$i] >= 0) {
243			continue;
244			}
245
246			$match = null;
247			if (preg_match($pattern, $content, $match)) {
248			$matches[$i] = $match;
249
250			// we'll store the match position as well; that way, we
251			// don't have to redo all preg_matches after changing only
252			// the first (we'll still know where those others are)
253			$positions[$i] = strpos($content, $match[0]);
254			} else {
255			// if the pattern couldn't be matched, there's no point in
256			// executing it again in later runs on this same content;
257			// ignore this one until we reach end of content
258			unset($matches[$i]);
259			$positions[$i] = strlen($content);
260			}
261			}
262
263			// no more matches to find: everything's been processed, break out
264			if (!$matches) {
			0 ignored issues – show Bug Best Practice introduced 2015-12-17 21:43 UTC by Report Bug Copy Issue Report The expression `$matches` of type `array` is implicitly converted to a boolean; are you sure this is intended? If so, consider using `empty($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...
265			$processed .= $content;
266			break;
267			}
268
269			// see which of the patterns actually found the first thing (we'll
270			// only want to execute that one, since we're unsure if what the
271			// other found was not inside what the first found)
272			$discardLength = min($positions);
273			$firstPattern = array_search($discardLength, $positions);
274			$match = $matches[$firstPattern][0];
275
276			// execute the pattern that matches earliest in the content string
277			list($pattern, $replacement) = $this->patterns[$firstPattern];
278			$replacement = $this->replacePattern($pattern, $replacement, $content);
279
280			// figure out which part of the string was unmatched; that's the
281			// part we'll execute the patterns on again next
282			$content = substr($content, $discardLength);
283			$unmatched = (string) substr($content, strpos($content, $match) + strlen($match));
284
285			// move the replaced part to $processed and prepare $content to
286			// again match batch of patterns against
287			$processed .= substr($replacement, 0, strlen($replacement) - strlen($unmatched));
288			$content = $unmatched;
289
290			// first match has been replaced & that content is to be left alone,
291			// the next matches will start after this replacement, so we should
292			// fix their offsets
293			foreach ($positions as $i => $position) {
294			$positions[$i] -= $discardLength + strlen($match);
295			}
296			}
297
298			return $processed;
299			}
300
301			/**
302			* This is where a pattern is matched against $content and the matches
303			* are replaced by their respective value.
304			* This function will be called plenty of times, where $content will always
305			* move up 1 character.
306			*
307			* @param string $pattern Pattern to match
308			* @param string\|callable $replacement Replacement value
309			* @param string $content Content to match pattern against
310			*
311			* @return string
312			*/
313			protected function replacePattern($pattern, $replacement, $content)
314			{
315			if (is_callable($replacement)) {
316			return preg_replace_callback($pattern, $replacement, $content, 1, $count);
317			} else {
318			return preg_replace($pattern, $replacement, $content, 1, $count);
319			}
320			}
321
322			/**
323			* Strings are a pattern we need to match, in order to ignore potential
324			* code-like content inside them, but we just want all of the string
325			* content to remain untouched.
326			*
327			* This method will replace all string content with simple STRING#
328			* placeholder text, so we've rid all strings from characters that may be
329			* misinterpreted. Original string content will be saved in $this->extracted
330			* and after doing all other minifying, we can restore the original content
331			* via restoreStrings().
332			*
333			* @param string[optional] $chars
334			*/
335			protected function extractStrings($chars = '\'"')
336			{
337			// PHP only supports $this inside anonymous functions since 5.4
338			$minifier = $this;
339			$callback = function ($match) use ($minifier) {
340			// check the second index here, because the first always contains a quote
341			if ($match[2] === '') {
342			/*
343			* Empty strings need no placeholder; they can't be confused for
344			* anything else anyway.
345			* But we still needed to match them, for the extraction routine
346			* to skip over this particular string.
347			*/
348			return $match[0];
349			}
350
351			$count = count($minifier->extracted);
352			$placeholder = $match[1].$count.$match[1];
353			$minifier->extracted[$placeholder] = $match[1].$match[2].$match[1];
354
355			return $placeholder;
356			};
357
358			/*
359			* The \\ messiness explained:
360			* * Don't count ' or " as end-of-string if it's escaped (has backslash
361			* in front of it)
362			* * Unless... that backslash itself is escaped (another leading slash),
363			* in which case it's no longer escaping the ' or "
364			* * So there can be either no backslash, or an even number
365			* * multiply all of that times 4, to account for the escaping that has
366			* to be done to pass the backslash into the PHP string without it being
367			* considered as escape-char (times 2) and to get it in the regex,
368			* escaped (times 2)
369			*/
370			$this->registerPattern('/(['.$chars.'])(.?(?<!\\\\)(\\\\\\\\)+)\\1/s', $callback);
371			}
372
373			/**
374			* This method will restore all extracted data (strings, regexes) that were
375			* replaced with placeholder text in extract*(). The original content was
376			* saved in $this->extracted.
377			*
378			* @param string $content
379			*
380			* @return string
381			*/
382			protected function restoreExtractedData($content)
383			{
384			if (!$this->extracted) {
			0 ignored issues – show Bug Best Practice introduced 2015-12-17 21:43 UTC by Report Bug Copy Issue Report The expression `$this->extracted` of type `string[]` is implicitly converted to a boolean; are you sure this is intended? If so, consider using `empty($expr)` instead to make it clear that you intend to check for an array without elements. This check marks implicit conversions of arrays to boolean values in a comparison. While in PHP an empty array is considered to be equal (but not identical) to false, this is not always apparent. Consider making the comparison explicit by using `empty(..)` or `! empty(...)` instead. Loading history...
385			// nothing was extracted, nothing to restore
386			return $content;
387			}
388
389			$content = strtr($content, $this->extracted);
390
391			$this->extracted = array();
392
393			return $content;
394			}
395
396			/**
397			* Check if the path is a regular file and can be read.
398			*
399			* @param string $path
400			*
401			* @return bool
402			*/
403			protected function canImportFile($path)
404			{
405			return strlen($path) < PHP_MAXPATHLEN && @is_file($path) && is_readable($path);
406			}
407
408			/**
409			* Attempts to open file specified by $path for writing.
410			*
411			* @param string $path The path to the file
412			*
413			* @return resource Specifier for the target file
414			*
415			* @throws IOException
416			*/
417			protected function openFileForWriting($path)
418			{
419			if (($handler = @fopen($path, 'w')) === false) {
420			throw new IOException('The file "'.$path.'" could not be opened for writing. Check if PHP has enough permissions.');
421			}
422
423			return $handler;
424			}
425
426			/**
427			* Attempts to write $content to the file specified by $handler. $path is used for printing exceptions.
428			*
429			* @param resource $handler The resource to write to
430			* @param string $content The content to write
431			* @param string $path The path to the file (for exception printing only)
432			*
433			* @throws IOException
434			*/
435			protected function writeToFile($handler, $content, $path = '')
436			{
437			if (($result = @fwrite($handler, $content)) === false \|\| ($result < strlen($content))) {
438			throw new IOException('The file "'.$path.'" could not be written to. Check your disk space and file permissions.');
439			}
440			}
441
442			/**
443			* Set Leave comment in compressed file parameter
444			* If true, minify will leave comment in compressed file
445			* if it starts with /*! or contains @license or @preserve tags.
446			* If false, all comments will be removed.
447			*
448			* @param bool $value
449			*/
450			public function setLeavePreservedComments($value)
451			{
452			$this->leavePreservedComments = $value;
453			}
454			}
455

matthiasmullie / minify

Pull Request — master (#177)

Minify::extractStrings() B

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