Completed
Push — master ( 6e9d57...ff4ec6 )
by Matthias
05:32
created

JS::stripWhitespace()   B

Complexity

Conditions 1
Paths 1

Size

Total Lines 99
Code Lines 36

Duplication

Lines 0
Ratio 0 %

Importance

Changes 0
Metric Value
dl 0
loc 99
rs 8.3103
c 0
b 0
f 0
cc 1
eloc 36
nc 1
nop 1

How to fix   Long Method   

Long Method

Small methods make your code easier to understand, in particular if combined with a good name. Besides, if your method is small, finding a good name is usually much easier.

For example, if you find yourself adding comments to a method's body, this is usually a good sign to extract the commented part to a new method, and use the comment as a starting point when coming up with a good name for this new method.

Commonly applied refactorings include:

1
<?php
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namespace MatthiasMullie\Minify;
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/**
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 * JavaScript minifier.
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 *
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 * Please report bugs on https://github.com/matthiasmullie/minify/issues
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 *
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 * @author Matthias Mullie <[email protected]>
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 * @author Tijs Verkoyen <[email protected]>
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 * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
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 * @license MIT License
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 */
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class JS extends Minify
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{
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    /**
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     * Var-matching regex based on http://stackoverflow.com/a/9337047/802993.
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     *
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     * Note that regular expressions using that bit must have the PCRE_UTF8
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     * pattern modifier (/u) set.
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     *
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     * @var string
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     */
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    const REGEX_VARIABLE = 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2}-\x{a788}\x{a78b}-\x{a78e}\x{a790}-\x{a793}\x{a7a0}-\x{a7aa}\x{a7f8}-\x{a801}\x{a803}-\x{a805}\x{a807}-\x{a80a}\x{a80c}-\x{a822}\x{a840}-\x{a873}\x{a882}-\x{a8b3}\x{a8f2}-\x{a8f7}\x{a8fb}\x{a90a}-\x{a925}\x{a930}-\x{a946}\x{a960}-\x{a97c}\x{a984}-\x{a9b2}\x{a9cf}\x{aa00}-\x{aa28}\x{aa40}-\x{aa42}\x{aa44}-\x{aa4b}\x{aa60}-\x{aa76}\x{aa7a}\x{aa80}-\x{aaaf}\x{aab1}\x{aab5}\x{aab6}\x{aab9}-\x{aabd}\x{aac0}\x{aac2}\x{aadb}-\x{aadd}\x{aae0}-\x{aaea}\x{aaf2}-\x{aaf4}\x{ab01}-\x{ab06}\x{ab09}-\x{ab0e}\x{ab11}-\x{ab16}\x{ab20}-\x{ab26}\x{ab28}-\x{ab2e}\x{abc0}-\x{abe2}\x{ac00}-\x{d7a3}\x{d7b0}-\x{d7c6}\x{d7cb}-\x{d7fb}\x{f900}-\x{fa6d}\x{fa70}-\x{fad9}\x{fb00}-\x{fb06}\x{fb13}-\x{fb17}\x{fb1d}\x{fb1f}-\x{fb28}\x{fb2a}-\x{fb36}\x{fb38}-\x{fb3c}\x{fb3e}\x{fb40}\x{fb41}\x{fb43}\x{fb44}\x{fb46}-\x{fbb1}\x{fbd3}-\x{fd3d}\x{fd50}-\x{fd8f}\x{fd92}-\x{fdc7}\x{fdf0}-\x{fdfb}\x{fe70}-\x{fe74}\x{fe76}-\x{fefc}\x{ff21}-\x{ff3a}\x{ff41}-\x{ff5a}\x{ff66}-\x{ffbe}\x{ffc2}-\x{ffc7}\x{ffca}-\x{ffcf}\x{ffd2}-\x{ffd7}\x{ffda}-\x{ffdc}0-9\x{0300}-\x{036f}\x{0483}-\x{0487}\x{0591}-\x{05bd}\x{05bf}\x{05c1}\x{05c2}\x{05c4}\x{05c5}\x{05c7}\x{0610}-\x{061a}\x{064b}-\x{0669}\x{0670}\x{06d6}-\x{06dc}\x{06df}-\x{06e4}\x{06e7}\x{06e8}\x{06ea}-\x{06ed}\x{06f0}-\x{06f9}\x{0711}\x{0730}-\x{074a}\x{07a6}-\x{07b0}\x{07c0}-\x{07c9}\x{07eb}-\x{07f3}\x{0816}-\x{0819}\x{081b}-\x{0823}\x{0825}-\x{0827}\x{0829}-\x{082d}\x{0859}-\x{085b}\x{08e4}-\x{08fe}\x{0900}-\x{0903}\x{093a}-\x{093c}\x{093e}-\x{094f}\x{0951}-\x{0957}\x{0962}\x{0963}\x{0966}-\x{096f}\x{0981}-\x{0983}\x{09bc}\x{09be}-\x{09c4}\x{09c7}\x{09c8}\x{09cb}-\x{09cd}\x{09d7}\x{09e2}\x{09e3}\x{09e6}-\x{09ef}\x{0a01}-\x{0a03}\x{0a3c}\x{0a3e}-\x{0a42}\x{0a47}\x{0a48}\x{0a4b}-\x{0a4d}\x{0a51}\x{0a66}-\x{0a71}\x{0a75}\x{0a81}-\x{0a83}\x{0abc}\x{0abe}-\x{0ac5}\x{0ac7}-\x{0ac9}\x{0acb}-\x{0acd}\x{0ae2}\x{0ae3}\x{0ae6}-\x{0aef}\x{0b01}-\x{0b03}\x{0b3c}\x{0b3e}-\x{0b44}\x{0b47}\x{0b48}\x{0b4b}-\x{0b4d}\x{0b56}\x{0b57}\x{0b62}\x{0b63}\x{0b66}-\x{0b6f}\x{0b82}\x{0bbe}-\x{0bc2}\x{0bc6}-\x{0bc8}\x{0bca}-\x{0bcd}\x{0bd7}\x{0be6}-\x{0bef}\x{0c01}-\x{0c03}\x{0c3e}-\x{0c44}\x{0c46}-\x{0c48}\x{0c4a}-\x{0c4d}\x{0c55}\x{0c56}\x{0c62}\x{0c63}\x{0c66}-\x{0c6f}\x{0c82}\x{0c83}\x{0cbc}\x{0cbe}-\x{0cc4}\x{0cc6}-\x{0cc8}\x{0cca}-\x{0ccd}\x{0cd5}\x{0cd6}\x{0ce2}\x{0ce3}\x{0ce6}-\x{0cef}\x{0d02}\x{0d03}\x{0d3e}-\x{0d44}\x{0d46}-\x{0d48}\x{0d4a}-\x{0d4d}\x{0d57}\x{0d62}\x{0d63}\x{0d66}-\x{0d6f}\x{0d82}\x{0d83}\x{0dca}\x{0dcf}-\x{0dd4}\x{0dd6}\x{0dd8}-\x{0ddf}\x{0df2}\x{0df3}\x{0e31}\x{0e34}-\x{0e3a}\x{0e47}-\x{0e4e}\x{0e50}-\x{0e59}\x{0eb1}\x{0eb4}-\x{0eb9}\x{0ebb}\x{0ebc}\x{0ec8}-\x{0ecd}\x{0ed0}-\x{0ed9}\x{0f18}\x{0f19}\x{0f20}-\x{0f29}\x{0f35}\x{0f37}\x{0f39}\x{0f3e}\x{0f3f}\x{0f71}-\x{0f84}\x{0f86}\x{0f87}\x{0f8d}-\x{0f97}\x{0f99}-\x{0fbc}\x{0fc6}\x{102b}-\x{103e}\x{1040}-\x{1049}\x{1056}-\x{1059}\x{105e}-\x{1060}\x{1062}-\x{1064}\x{1067}-\x{106d}\x{1071}-\x{1074}\x{1082}-\x{108d}\x{108f}-\x{109d}\x{135d}-\x{135f}\x{1712}-\x{1714}\x{1732}-\x{1734}\x{1752}\x{1753}\x{1772}\x{1773}\x{17b4}-\x{17d3}\x{17dd}\x{17e0}-\x{17e9}\x{180b}-\x{180d}\x{1810}-\x{1819}\x{18a9}\x{1920}-\x{192b}\x{1930}-\x{193b}\x{1946}-\x{194f}\x{19b0}-\x{19c0}\x{19c8}\x{19c9}\x{19d0}-\x{19d9}\x{1a17}-\x{1a1b}\x{1a55}-\x{1a5e}\x{1a60}-\x{1a7c}\x{1a7f}-\x{1a89}\x{1a90}-\x{1a99}\x{1b00}-\x{1b04}\x{1b34}-\x{1b44}\x{1b50}-\x{1b59}\x{1b6b}-\x{1b73}\x{1b80}-\x{1b82}\x{1ba1}-\x{1bad}\x{1bb0}-\x{1bb9}\x{1be6}-\x{1bf3}\x{1c24}-\x{1c37}\x{1c40}-\x{1c49}\x{1c50}-\x{1c59}\x{1cd0}-\x{1cd2}\x{1cd4}-\x{1ce8}\x{1ced}\x{1cf2}-\x{1cf4}\x{1dc0}-\x{1de6}\x{1dfc}-\x{1dff}\x{200c}\x{200d}\x{203f}\x{2040}\x{2054}\x{20d0}-\x{20dc}\x{20e1}\x{20e5}-\x{20f0}\x{2cef}-\x{2cf1}\x{2d7f}\x{2de0}-\x{2dff}\x{302a}-\x{302f}\x{3099}\x{309a}\x{a620}-\x{a629}\x{a66f}\x{a674}-\x{a67d}\x{a69f}\x{a6f0}\x{a6f1}\x{a802}\x{a806}\x{a80b}\x{a823}-\x{a827}\x{a880}\x{a881}\x{a8b4}-\x{a8c4}\x{a8d0}-\x{a8d9}\x{a8e0}-\x{a8f1}\x{a900}-\x{a909}\x{a926}-\x{a92d}\x{a947}-\x{a953}\x{a980}-\x{a983}\x{a9b3}-\x{a9c0}\x{a9d0}-\x{a9d9}\x{aa29}-\x{aa36}\x{aa43}\x{aa4c}\x{aa4d}\x{aa50}-\x{aa59}\x{aa7b}\x{aab0}\x{aab2}-\x{aab4}\x{aab7}\x{aab8}\x{aabe}\x{aabf}\x{aac1}\x{aaeb}-\x{aaef}\x{aaf5}\x{aaf6}\x{abe3}-\x{abea}\x{abec}\x{abed}\x{abf0}-\x{abf9}\x{fb1e}\x{fe00}-\x{fe0f}\x{fe20}-\x{fe26}\x{fe33}\x{fe34}\x{fe4d}-\x{fe4f}\x{ff10}-\x{ff19}\x{ff3f}]*\b';
26
27
    /**
28
     * Full list of JavaScript reserved words.
29
     * Will be loaded from /data/js/keywords_reserved.txt.
30
     *
31
     * @see https://mathiasbynens.be/notes/reserved-keywords
32
     *
33
     * @var string[]
34
     */
35
    protected $keywordsReserved = array();
36
37
    /**
38
     * List of JavaScript reserved words that accept a <variable, value, ...>
39
     * after them. Some end of lines are not the end of a statement, like with
40
     * these keywords.
41
     *
42
     * E.g.: we shouldn't insert a ; after this else
43
     * else
44
     *     console.log('this is quite fine')
45
     *
46
     * Will be loaded from /data/js/keywords_before.txt
47
     *
48
     * @var string[]
49
     */
50
    protected $keywordsBefore = array();
51
52
    /**
53
     * List of JavaScript reserved words that accept a <variable, value, ...>
54
     * before them. Some end of lines are not the end of a statement, like when
55
     * continued by one of these keywords on the newline.
56
     *
57
     * E.g.: we shouldn't insert a ; before this instanceof
58
     * variable
59
     *     instanceof String
60
     *
61
     * Will be loaded from /data/js/keywords_after.txt
62
     *
63
     * @var string[]
64
     */
65
    protected $keywordsAfter = array();
66
67
    /**
68
     * List of all JavaScript operators.
69
     *
70
     * Will be loaded from /data/js/operators.txt
71
     *
72
     * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
73
     *
74
     * @var string[]
75
     */
76
    protected $operators = array();
77
78
    /**
79
     * List of JavaScript operators that accept a <variable, value, ...> after
80
     * them. Some end of lines are not the end of a statement, like with these
81
     * operators.
82
     *
83
     * Note: Most operators are fine, we've only removed ++ and --.
84
     * ++ & -- have to be joined with the value they're in-/decrementing.
85
     *
86
     * Will be loaded from /data/js/operators_before.txt
87
     *
88
     * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
89
     *
90
     * @var string[]
91
     */
92
    protected $operatorsBefore = array();
93
94
    /**
95
     * List of JavaScript operators that accept a <variable, value, ...> before
96
     * them. Some end of lines are not the end of a statement, like when
97
     * continued by one of these operators on the newline.
98
     *
99
     * Note: Most operators are fine, we've only removed ), ], ++, --, ! and ~.
100
     * There can't be a newline separating ! or ~ and whatever it is negating.
101
     * ++ & -- have to be joined with the value they're in-/decrementing.
102
     * ) & ] are "special" in that they have lots or usecases. () for example
103
     * is used for function calls, for grouping, in if () and for (), ...
104
     *
105
     * Will be loaded from /data/js/operators_after.txt
106
     *
107
     * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
108
     *
109
     * @var string[]
110
     */
111
    protected $operatorsAfter = array();
112
113
    /**
114
     * @var array
115
     */
116
    protected $nestedExtracted = array();
117
118
    /**
119
     * {@inheritdoc}
120
     */
121
    public function __construct()
122
    {
123
        call_user_func_array(array('parent', '__construct'), func_get_args());
124
125
        $dataDir = __DIR__.'/../data/js/';
126
        $options = FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES;
127
        $this->keywordsReserved = file($dataDir.'keywords_reserved.txt', $options);
128
        $this->keywordsBefore = file($dataDir.'keywords_before.txt', $options);
129
        $this->keywordsAfter = file($dataDir.'keywords_after.txt', $options);
130
        $this->operators = file($dataDir.'operators.txt', $options);
131
        $this->operatorsBefore = file($dataDir.'operators_before.txt', $options);
132
        $this->operatorsAfter = file($dataDir.'operators_after.txt', $options);
133
    }
134
135
    /**
136
     * Minify the data.
137
     * Perform JS optimizations.
138
     *
139
     * @param string[optional] $path Path to write the data to
140
     *
141
     * @return string The minified data
142
     */
143
    public function execute($path = null)
144
    {
145
        $content = '';
146
147
        // loop files
148
        foreach ($this->data as $source => $js) {
149
            /*
150
             * Combine js: separating the scripts by a ;
151
             * I'm also adding a newline: it will be eaten when whitespace is
152
             * stripped, but we need to make sure we're not just appending
153
             * a new script right after a previous script that ended with a
154
             * singe-line comment on the last line (in which case it would also
155
             * be seen as part of that comment)
156
             */
157
            $content .= $js."\n;";
158
        }
159
160
        /*
161
         * Let's first take out strings, comments and regular expressions.
162
         * All of these can contain JS code-like characters, and we should make
163
         * sure any further magic ignores anything inside of these.
164
         *
165
         * Consider this example, where we should not strip any whitespace:
166
         * var str = "a   test";
167
         *
168
         * Comments will be removed altogether, strings and regular expressions
169
         * will be replaced by placeholder text, which we'll restore later.
170
         */
171
        $this->extractStrings('\'"`');
172
        $this->stripComments();
173
        $this->extractRegex();
174
        $content = $this->replace($content);
175
176
        $content = $this->propertyNotation($content);
177
        $content = $this->shortenBools($content);
178
        $content = $this->stripWhitespace($content);
179
180
        /*
181
         * Earlier, we extracted strings & regular expressions and replaced them
182
         * with placeholder text. This will restore them.
183
         */
184
        $content = $this->restoreExtractedData($content);
185
186
        return $content;
187
    }
188
189
    /**
190
     * Strip comments from source code.
191
     */
192
    protected function stripComments()
193
    {
194
        // single-line comments
195
        $this->registerPattern('/\/\/.*$/m', '');
196
197
        // multi-line comments
198
        $this->registerPattern('/\/\*.*?\*\//s', '');
199
    }
200
201
    /**
202
     * JS can have /-delimited regular expressions, like: /ab+c/.match(string).
203
     *
204
     * The content inside the regex can contain characters that may be confused
205
     * for JS code: e.g. it could contain whitespace it needs to match & we
206
     * don't want to strip whitespace in there.
207
     *
208
     * The regex can be pretty simple: we don't have to care about comments,
209
     * (which also use slashes) because stripComments() will have stripped those
210
     * already.
211
     *
212
     * This method will replace all string content with simple REGEX#
213
     * placeholder text, so we've rid all regular expressions from characters
214
     * that may be misinterpreted. Original regex content will be saved in
215
     * $this->extracted and after doing all other minifying, we can restore the
216
     * original content via restoreRegex()
217
     */
218
    protected function extractRegex()
219
    {
220
        // PHP only supports $this inside anonymous functions since 5.4
221
        $minifier = $this;
222
        $callback = function ($match) use ($minifier) {
223
            $count = count($minifier->extracted);
224
            $placeholder = '"'.$count.'"';
225
            $minifier->extracted[$placeholder] = $match['regex'];
226
227
            // because we're also trying to find regular expressions that follow
228
            // if/when/for statements, we should also make sure that the content
229
            // within these statements is also minified...
230
            // e.g. `if("some   string"/* or comment */)` should become
231
            //      `if("some   string")`
232
            if (isset($match['before'])) {
233
                $other = new static();
234
                $other->extractStrings('\'"`', "$count-");
235
                $other->stripComments();
236
                $match['before'] = $other->replace($match['before']);
237
                $this->nestedExtracted += $other->extracted;
238
            }
239
240
            return (isset($match['before']) ? $match['before'] : '').
241
                $placeholder.
242
                (isset($match['after']) ? $match['after'] : '');
243
        };
244
245
        $pattern = '(?P<regex>\/.*?(?<!\\\\)(\\\\\\\\)*\/[gimy]*)(?![0-9a-zA-Z\/])';
246
247
        // a regular expression can only be followed by a few operators or some
248
        // of the RegExp methods (a `\` followed by a variable or value is
249
        // likely part of a division, not a regex)
250
        $keywords = array('do', 'in', 'new', 'else', 'throw', 'yield', 'delete', 'return',  'typeof');
251
        $before = '(?P<before>[=:,;\}\(\{&\|]|^|'.implode('|', $keywords).')';
252
        $propertiesAndMethods = array(
253
            // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties
254
            'prototype',
255
            'length',
256
            'lastIndex',
257
            // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties_2
258
            'constructor',
259
            'flags',
260
            'global',
261
            'ignoreCase',
262
            'multiline',
263
            'source',
264
            'sticky',
265
            'unicode',
266
            // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2
267
            'compile(',
268
            'exec(',
269
            'test(',
270
            'match',
271
            'replace(',
272
            'search(',
273
            'split(',
274
            'toSource(',
275
            'toString(',
276
        );
277
        $delimiters = array_fill(0, count($propertiesAndMethods), '/');
278
        $propertiesAndMethods = array_map('preg_quote', $propertiesAndMethods, $delimiters);
279
        $after = '(?P<after>[\.,;\)\}&\|+]|$|\.('.implode('|', $propertiesAndMethods).'))';
280
        $this->registerPattern('/'.$before.'\s*'.$pattern.'\s*'.$after.'/', $callback);
281
282
        // we didn't check for regular expressions after `)`, because that is
283
        // more often than not not a character where a regex can follow (e.g.
284
        // (1+2)/3/4 -> /3/ could be considered a regex, but it's not)
285
        // however, after single-line if/while/for, there could very well be a
286
        // regex after `)` (e.g. if(true)/regex/)
287
        // there is one problem, though: it's (near) impossible to check for
288
        // when the if/while/for statement is closed (same amount of closing
289
        // brackets as there were opened), so I'll ignore single-line statements
290
        // with nested brackets followed by a regex for now...
291
        $before = '(?P<before>\b(if|while|for)\s*\((?P<code>[^\(]+?)\))';
292
        $this->registerPattern('/'.$before.'\s*'.$pattern.'\s*'.$after.'/', $callback);
293
294
        // 1 more edge case: a regex can be followed by a lot more operators or
295
        // keywords if there's a newline (ASI) in between, where the operator
296
        // actually starts a new statement
297
        // (https://github.com/matthiasmullie/minify/issues/56)
298
        $operators = $this->getOperatorsForRegex($this->operatorsBefore, '/');
299
        $operators += $this->getOperatorsForRegex($this->keywordsReserved, '/');
300
        $after = '(?P<after>\n\s*('.implode('|', $operators).'))';
301
        $this->registerPattern('/'.$pattern.'\s*'.$after.'/', $callback);
302
    }
303
304
    /**
305
     * In addition to the regular restore routine, we also need to restore a few
306
     * more things that have been extracted as part of the regex extraction...
307
     *
308
     * {@inheritdoc}
309
     */
310
    protected function restoreExtractedData($content)
311
    {
312
        // restore regular extracted stuff
313
        $content = parent::restoreExtractedData($content);
314
315
        // restore nested stuff from within regex extraction
316
        $content = strtr($content, $this->nestedExtracted);
317
318
        return $content;
319
    }
320
321
    /**
322
     * Strip whitespace.
323
     *
324
     * We won't strip *all* whitespace, but as much as possible. The thing that
325
     * we'll preserve are newlines we're unsure about.
326
     * JavaScript doesn't require statements to be terminated with a semicolon.
327
     * It will automatically fix missing semicolons with ASI (automatic semi-
328
     * colon insertion) at the end of line causing errors (without semicolon.)
329
     *
330
     * Because it's sometimes hard to tell if a newline is part of a statement
331
     * that should be terminated or not, we'll just leave some of them alone.
332
     *
333
     * @param string $content The content to strip the whitespace for
334
     *
335
     * @return string
336
     */
337
    protected function stripWhitespace($content)
338
    {
339
        // uniform line endings, make them all line feed
340
        $content = str_replace(array("\r\n", "\r"), "\n", $content);
341
342
        // collapse all non-line feed whitespace into a single space
343
        $content = preg_replace('/[^\S\n]+/', ' ', $content);
344
345
        // strip leading & trailing whitespace
346
        $content = str_replace(array(" \n", "\n "), "\n", $content);
347
348
        // collapse consecutive line feeds into just 1
349
        $content = preg_replace('/\n+/', "\n", $content);
350
351
        $operatorsBefore = $this->getOperatorsForRegex($this->operatorsBefore, '/');
352
        $operatorsAfter = $this->getOperatorsForRegex($this->operatorsAfter, '/');
353
        $operators = $this->getOperatorsForRegex($this->operators, '/');
354
        $keywordsBefore = $this->getKeywordsForRegex($this->keywordsBefore, '/');
355
        $keywordsAfter = $this->getKeywordsForRegex($this->keywordsAfter, '/');
356
357
        // strip whitespace that ends in (or next line begin with) an operator
358
        // that allows statements to be broken up over multiple lines
359
        unset($operatorsBefore['+'], $operatorsBefore['-'], $operatorsAfter['+'], $operatorsAfter['-']);
360
        $content = preg_replace(
361
            array(
362
                '/('.implode('|', $operatorsBefore).')\s+/',
363
                '/\s+('.implode('|', $operatorsAfter).')/',
364
            ), '\\1', $content
365
        );
366
367
        // make sure + and - can't be mistaken for, or joined into ++ and --
368
        $content = preg_replace(
369
            array(
370
                '/(?<![\+\-])\s*([\+\-])(?![\+\-])/',
371
                '/(?<![\+\-])([\+\-])\s*(?![\+\-])/',
372
            ), '\\1', $content
373
        );
374
375
        // collapse whitespace around reserved words into single space
376
        $content = preg_replace('/(^|[;\}\s])\K('.implode('|', $keywordsBefore).')\s+/', '\\2 ', $content);
377
        $content = preg_replace('/\s+('.implode('|', $keywordsAfter).')(?=([;\{\s]|$))/', ' \\1', $content);
378
379
        /*
380
         * We didn't strip whitespace after a couple of operators because they
381
         * could be used in different contexts and we can't be sure it's ok to
382
         * strip the newlines. However, we can safely strip any non-line feed
383
         * whitespace that follows them.
384
         */
385
        $operatorsDiffBefore = array_diff($operators, $operatorsBefore);
386
        $operatorsDiffAfter = array_diff($operators, $operatorsAfter);
387
        $content = preg_replace('/('.implode('|', $operatorsDiffBefore).')[^\S\n]+/', '\\1', $content);
388
        $content = preg_replace('/[^\S\n]+('.implode('|', $operatorsDiffAfter).')/', '\\1', $content);
389
390
        /*
391
         * Get rid of double semicolons, except where they can be used like:
392
         * "for(v=1,_=b;;)", "for(v=1;;v++)" or "for(;;ja||(ja=true))".
393
         * I'll safeguard these double semicolons inside for-loops by
394
         * temporarily replacing them with an invalid condition: they won't have
395
         * a double semicolon and will be easy to spot to restore afterwards.
396
         */
397
        $content = preg_replace('/\bfor\(([^;]*);;([^;]*)\)/', 'for(\\1;-;\\2)', $content);
398
        $content = preg_replace('/;+/', ';', $content);
399
        $content = preg_replace('/\bfor\(([^;]*);-;([^;]*)\)/', 'for(\\1;;\\2)', $content);
400
401
        /*
402
         * Next, we'll be removing all semicolons where ASI kicks in.
403
         * for-loops however, can have an empty body (ending in only a
404
         * semicolon), like: `for(i=1;i<3;i++);`, of `for(i in list);`
405
         * Here, nothing happens during the loop; it's just used to keep
406
         * increasing `i`. With that ; omitted, the next line would be expected
407
         * to be the for-loop's body...
408
         * I'm going to double that semicolon (if any) so after the next line,
409
         * which strips semicolons here & there, we're still left with this one.
410
         */
411
        $content = preg_replace('/(for\([^;\{]*;[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\2', $content);
412
        $content = preg_replace('/(for\([^;\{]+\s+in\s+[^;\{]+\));(\}|$)/s', '\\1;;\\2', $content);
413
414
        /*
415
         * We also can't strip empty else-statements. Even though they're
416
         * useless and probably shouldn't be in the code in the first place, we
417
         * shouldn't be stripping the `;` that follows it as it breaks the code.
418
         * We can just remove those useless else-statements completely.
419
         *
420
         * @see https://github.com/matthiasmullie/minify/issues/91
421
         */
422
        $content = preg_replace('/else;/s', '', $content);
423
424
        /*
425
         * We also don't really want to terminate statements followed by closing
426
         * curly braces (which we've ignored completely up until now) or end-of-
427
         * script: ASI will kick in here & we're all about minifying.
428
         * Semicolons at beginning of the file don't make any sense either.
429
         */
430
        $content = preg_replace('/;(\}|$)/s', '\\1', $content);
431
        $content = ltrim($content, ';');
432
433
        // get rid of remaining whitespace af beginning/end
434
        return trim($content);
435
    }
436
437
    /**
438
     * We'll strip whitespace around certain operators with regular expressions.
439
     * This will prepare the given array by escaping all characters.
440
     *
441
     * @param string[] $operators
442
     * @param string   $delimiter
443
     *
444
     * @return string[]
445
     */
446
    protected function getOperatorsForRegex(array $operators, $delimiter = '/')
447
    {
448
        // escape operators for use in regex
449
        $delimiters = array_fill(0, count($operators), $delimiter);
450
        $escaped = array_map('preg_quote', $operators, $delimiters);
451
452
        $operators = array_combine($operators, $escaped);
453
454
        // ignore + & - for now, they'll get special treatment
455
        unset($operators['+'], $operators['-']);
456
457
        // dot can not just immediately follow a number; it can be confused for
458
        // decimal point, or calling a method on it, e.g. 42 .toString()
459
        $operators['.'] = '(?<![0-9]\s)\.';
460
461
        // don't confuse = with other assignment shortcuts (e.g. +=)
462
        $chars = preg_quote('+-*\=<>%&|', $delimiter);
463
        $operators['='] = '(?<!['.$chars.'])\=';
464
465
        return $operators;
466
    }
467
468
    /**
469
     * We'll strip whitespace around certain keywords with regular expressions.
470
     * This will prepare the given array by escaping all characters.
471
     *
472
     * @param string[] $keywords
473
     * @param string   $delimiter
474
     *
475
     * @return string[]
476
     */
477
    protected function getKeywordsForRegex(array $keywords, $delimiter = '/')
478
    {
479
        // escape keywords for use in regex
480
        $delimiter = array_fill(0, count($keywords), $delimiter);
481
        $escaped = array_map('preg_quote', $keywords, $delimiter);
482
483
        // add word boundaries
484
        array_walk($keywords, function ($value) {
485
            return '\b'.$value.'\b';
486
        });
487
488
        $keywords = array_combine($keywords, $escaped);
489
490
        return $keywords;
491
    }
492
493
    /**
494
     * Replaces all occurrences of array['key'] by array.key.
495
     *
496
     * @param string $content
497
     *
498
     * @return string
499
     */
500
    protected function propertyNotation($content)
501
    {
502
        // PHP only supports $this inside anonymous functions since 5.4
503
        $minifier = $this;
504
        $keywords = $this->keywordsReserved;
505
        $callback = function ($match) use ($minifier, $keywords) {
506
            $property = trim($minifier->extracted[$match[1]], '\'"');
507
508
            /*
509
             * Check if the property is a reserved keyword. In this context (as
510
             * property of an object literal/array) it shouldn't matter, but IE8
511
             * freaks out with "Expected identifier".
512
             */
513
            if (in_array($property, $keywords)) {
514
                return $match[0];
515
            }
516
517
            /*
518
             * See if the property is in a variable-like format (e.g.
519
             * array['key-here'] can't be replaced by array.key-here since '-'
520
             * is not a valid character there.
521
             */
522
            if (!preg_match('/^'.$minifier::REGEX_VARIABLE.'$/u', $property)) {
523
                return $match[0];
524
            }
525
526
            return '.'.$property;
527
        };
528
529
        /*
530
         * Figure out if previous character is a variable name (of the array
531
         * we want to use property notation on) - this is to make sure
532
         * standalone ['value'] arrays aren't confused for keys-of-an-array.
533
         * We can (and only have to) check the last character, because PHP's
534
         * regex implementation doesn't allow unfixed-length look-behind
535
         * assertions.
536
         */
537
        preg_match('/(\[[^\]]+\])[^\]]*$/', static::REGEX_VARIABLE, $previousChar);
538
        $previousChar = $previousChar[1];
539
540
        /*
541
         * Make sure word preceding the ['value'] is not a keyword, e.g.
542
         * return['x']. Because -again- PHP's regex implementation doesn't allow
543
         * unfixed-length look-behind assertions, I'm just going to do a lot of
544
         * separate look-behind assertions, one for each keyword.
545
         */
546
        $keywords = $this->getKeywordsForRegex($keywords);
547
        $keywords = '(?<!'.implode(')(?<!', $keywords).')';
548
549
        return preg_replace_callback('/(?<='.$previousChar.'|\])'.$keywords.'\[\s*(([\'"])[0-9]+\\2)\s*\]/u', $callback, $content);
550
    }
551
552
    /**
553
     * Replaces true & false by !0 and !1.
554
     *
555
     * @param string $content
556
     *
557
     * @return string
558
     */
559
    protected function shortenBools($content)
560
    {
561
        /*
562
         * 'true' or 'false' could be used as property names (which may be
563
         * followed by whitespace) - we must not replace those!
564
         * Since PHP doesn't allow variable-length (to account for the
565
         * whitespace) lookbehind assertions, I need to capture the leading
566
         * character and check if it's a `.`
567
         */
568
        $callback = function ($match) {
569
            if (trim($match[1]) === '.') {
570
                return $match[0];
571
            }
572
573
            return $match[1].($match[2] === 'true' ? '!0' : '!1');
574
        };
575
        $content = preg_replace_callback('/(^|.\s*)\b(true|false)\b(?!:)/', $callback, $content);
576
577
        // for(;;) is exactly the same as while(true), but shorter :)
578
        $content = preg_replace('/\bwhile\(!0\){/', 'for(;;){', $content);
579
580
        // now make sure we didn't turn any do ... while(true) into do ... for(;;)
581
        preg_match_all('/\bdo\b/', $content, $dos, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
582
583
        // go backward to make sure positional offsets aren't altered when $content changes
584
        $dos = array_reverse($dos);
585
        foreach ($dos as $do) {
586
            $offsetDo = $do[0][1];
587
588
            // find all `while` (now `for`) following `do`: one of those must be
589
            // associated with the `do` and be turned back into `while`
590
            preg_match_all('/\bfor\(;;\)/', $content, $whiles, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offsetDo);
591
            foreach ($whiles as $while) {
592
                $offsetWhile = $while[0][1];
593
594
                $open = substr_count($content, '{', $offsetDo, $offsetWhile - $offsetDo);
595
                $close = substr_count($content, '}', $offsetDo, $offsetWhile - $offsetDo);
596
                if ($open === $close) {
597
                    // only restore `while` if amount of `{` and `}` are the same;
598
                    // otherwise, that `for` isn't associated with this `do`
599
                    $content = substr_replace($content, 'while(!0)', $offsetWhile, strlen('for(;;)'));
600
                    break;
601
                }
602
            }
603
        }
604
605
        return $content;
606
    }
607
}
608