Completed
Push — master ( a370e2...7559ac )
by Matthias
01:14
created

JS::execute()   B

Complexity

Conditions 2
Paths 2

Size

Total Lines 45
Code Lines 15

Duplication

Lines 0
Ratio 0 %

Importance

Changes 0
Metric Value
dl 0
loc 45
rs 8.8571
c 0
b 0
f 0
cc 2
eloc 15
nc 2
nop 1
1
<?php
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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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 * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved
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 * @license MIT License
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 */
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namespace MatthiasMullie\Minify;
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/**
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 * JavaScript Minifier Class
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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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 * @package Minify
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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';
35
36
    /**
37
     * Full list of JavaScript reserved words.
38
     * Will be loaded from /data/js/keywords_reserved.txt.
39
     *
40
     * @see https://mathiasbynens.be/notes/reserved-keywords
41
     *
42
     * @var string[]
43
     */
44
    protected $keywordsReserved = array();
45
46
    /**
47
     * List of JavaScript reserved words that accept a <variable, value, ...>
48
     * after them. Some end of lines are not the end of a statement, like with
49
     * these keywords.
50
     *
51
     * E.g.: we shouldn't insert a ; after this else
52
     * else
53
     *     console.log('this is quite fine')
54
     *
55
     * Will be loaded from /data/js/keywords_before.txt
56
     *
57
     * @var string[]
58
     */
59
    protected $keywordsBefore = array();
60
61
    /**
62
     * List of JavaScript reserved words that accept a <variable, value, ...>
63
     * before them. Some end of lines are not the end of a statement, like when
64
     * continued by one of these keywords on the newline.
65
     *
66
     * E.g.: we shouldn't insert a ; before this instanceof
67
     * variable
68
     *     instanceof String
69
     *
70
     * Will be loaded from /data/js/keywords_after.txt
71
     *
72
     * @var string[]
73
     */
74
    protected $keywordsAfter = array();
75
76
    /**
77
     * List of all JavaScript operators.
78
     *
79
     * Will be loaded from /data/js/operators.txt
80
     *
81
     * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
82
     *
83
     * @var string[]
84
     */
85
    protected $operators = array();
86
87
    /**
88
     * List of JavaScript operators that accept a <variable, value, ...> after
89
     * them. Some end of lines are not the end of a statement, like with these
90
     * operators.
91
     *
92
     * Note: Most operators are fine, we've only removed ++ and --.
93
     * ++ & -- have to be joined with the value they're in-/decrementing.
94
     *
95
     * Will be loaded from /data/js/operators_before.txt
96
     *
97
     * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
98
     *
99
     * @var string[]
100
     */
101
    protected $operatorsBefore = array();
102
103
    /**
104
     * List of JavaScript operators that accept a <variable, value, ...> before
105
     * them. Some end of lines are not the end of a statement, like when
106
     * continued by one of these operators on the newline.
107
     *
108
     * Note: Most operators are fine, we've only removed ), ], ++, --, ! and ~.
109
     * There can't be a newline separating ! or ~ and whatever it is negating.
110
     * ++ & -- have to be joined with the value they're in-/decrementing.
111
     * ) & ] are "special" in that they have lots or usecases. () for example
112
     * is used for function calls, for grouping, in if () and for (), ...
113
     *
114
     * Will be loaded from /data/js/operators_after.txt
115
     *
116
     * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators
117
     *
118
     * @var string[]
119
     */
120
    protected $operatorsAfter = array();
121
122
    /**
123
     * {@inheritdoc}
124
     */
125
    public function __construct()
126
    {
127
        call_user_func_array(array('parent', '__construct'), func_get_args());
128
129
        $dataDir = __DIR__.'/../data/js/';
130
        $options = FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES;
131
        $this->keywordsReserved = file($dataDir.'keywords_reserved.txt', $options);
132
        $this->keywordsBefore = file($dataDir.'keywords_before.txt', $options);
133
        $this->keywordsAfter = file($dataDir.'keywords_after.txt', $options);
134
        $this->operators = file($dataDir.'operators.txt', $options);
135
        $this->operatorsBefore = file($dataDir.'operators_before.txt', $options);
136
        $this->operatorsAfter = file($dataDir.'operators_after.txt', $options);
137
    }
138
139
    /**
140
     * Minify the data.
141
     * Perform JS optimizations.
142
     *
143
     * @param string[optional] $path Path to write the data to
144
     *
145
     * @return string The minified data
146
     */
147
    public function execute($path = null)
148
    {
149
        $content = '';
150
151
        /*
152
         * Let's first take out strings, comments and regular expressions.
153
         * All of these can contain JS code-like characters, and we should make
154
         * sure any further magic ignores anything inside of these.
155
         *
156
         * Consider this example, where we should not strip any whitespace:
157
         * var str = "a   test";
158
         *
159
         * Comments will be removed altogether, strings and regular expressions
160
         * will be replaced by placeholder text, which we'll restore later.
161
         */
162
        $this->extractStrings('\'"`');
163
        $this->stripComments();
164
        $this->extractRegex();
165
166
        // loop files
167
        foreach ($this->data as $source => $js) {
168
            // take out strings, comments & regex (for which we've registered
169
            // the regexes just a few lines earlier)
170
            $js = $this->replace($js);
171
172
            $js = $this->propertyNotation($js);
173
            $js = $this->shortenBools($js);
174
            $js = $this->stripWhitespace($js);
175
176
            // combine js: separating the scripts by a ;
177
            $content .= $js.";";
178
        }
179
180
        // clean up leftover `;`s from the combination of multiple scripts
181
        $content = ltrim($content, ';');
182
        $content = substr($content, 0, -1);
183
184
        /*
185
         * Earlier, we extracted strings & regular expressions and replaced them
186
         * with placeholder text. This will restore them.
187
         */
188
        $content = $this->restoreExtractedData($content);
189
190
        return $content;
191
    }
192
193
    /**
194
     * Strip comments from source code.
195
     */
196
    protected function stripComments()
197
    {
198
        // single-line comments
199
        $this->registerPattern('/\/\/.*$/m', '');
200
201
        // multi-line comments
202
        $this->registerPattern('/\/\*.*?\*\//s', '');
203
    }
204
205
    /**
206
     * JS can have /-delimited regular expressions, like: /ab+c/.match(string).
207
     *
208
     * The content inside the regex can contain characters that may be confused
209
     * for JS code: e.g. it could contain whitespace it needs to match & we
210
     * don't want to strip whitespace in there.
211
     *
212
     * The regex can be pretty simple: we don't have to care about comments,
213
     * (which also use slashes) because stripComments() will have stripped those
214
     * already.
215
     *
216
     * This method will replace all string content with simple REGEX#
217
     * placeholder text, so we've rid all regular expressions from characters
218
     * that may be misinterpreted. Original regex content will be saved in
219
     * $this->extracted and after doing all other minifying, we can restore the
220
     * original content via restoreRegex()
221
     */
222
    protected function extractRegex()
223
    {
224
        // PHP only supports $this inside anonymous functions since 5.4
225
        $minifier = $this;
226
        $callback = function ($match) use ($minifier) {
227
            $count = count($minifier->extracted);
228
            $placeholder = '"'.$count.'"';
229
            $minifier->extracted[$placeholder] = $match[0];
230
231
            return $placeholder;
232
        };
233
234
        // match all chars except `/` and `\`
235
        // `\` is allowed though, along with whatever char follows (which is the
236
        // one being escaped)
237
        // this should allow all chars, except for an unescaped `/` (= the one
238
        // closing the regex)
239
        $pattern = '\\/([^\\/\\\\]*+|(\\\\.)*+)+\\/[gimy]*';
240
241
        // a regular expression can only be followed by a few operators or some
242
        // of the RegExp methods (a `\` followed by a variable or value is
243
        // likely part of a division, not a regex)
244
        $keywords = array('do', 'in', 'new', 'else', 'throw', 'yield', 'delete', 'return',  'typeof');
245
        $before = '([=:,;\}\(\{\[&\|!\)]|^|'.implode('|', $keywords).')\s*';
246
        $propertiesAndMethods = array(
247
            // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties_2
248
            'constructor',
249
            'flags',
250
            'global',
251
            'ignoreCase',
252
            'multiline',
253
            'source',
254
            'sticky',
255
            'unicode',
256
            // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2
257
            'compile(',
258
            'exec(',
259
            'test(',
260
            'toSource(',
261
            'toString(',
262
        );
263
        $delimiters = array_fill(0, count($propertiesAndMethods), '/');
264
        $propertiesAndMethods = array_map('preg_quote', $propertiesAndMethods, $delimiters);
265
        $after = '(?=\s*[\.,;\)\}&\|+]|\/\/|$|\.('.implode('|', $propertiesAndMethods).'))';
266
        $this->registerPattern('/'.$before.'\K'.$pattern.$after.'/', $callback);
267
268
        // 1 more edge case: a regex can be followed by a lot more operators or
269
        // keywords if there's a newline (ASI) in between, where the operator
270
        // actually starts a new statement
271
        // (https://github.com/matthiasmullie/minify/issues/56)
272
        $operators = $this->getOperatorsForRegex($this->operatorsBefore, '/');
273
        $operators += $this->getOperatorsForRegex($this->keywordsReserved, '/');
274
        $after = '(?=\s*\n\s*('.implode('|', $operators).'))';
275
        $this->registerPattern('/'.$pattern.$after.'/', $callback);
276
    }
277
278
    /**
279
     * Strip whitespace.
280
     *
281
     * We won't strip *all* whitespace, but as much as possible. The thing that
282
     * we'll preserve are newlines we're unsure about.
283
     * JavaScript doesn't require statements to be terminated with a semicolon.
284
     * It will automatically fix missing semicolons with ASI (automatic semi-
285
     * colon insertion) at the end of line causing errors (without semicolon.)
286
     *
287
     * Because it's sometimes hard to tell if a newline is part of a statement
288
     * that should be terminated or not, we'll just leave some of them alone.
289
     *
290
     * @param string $content The content to strip the whitespace for
291
     *
292
     * @return string
293
     */
294
    protected function stripWhitespace($content)
295
    {
296
        // uniform line endings, make them all line feed
297
        $content = str_replace(array("\r\n", "\r"), "\n", $content);
298
299
        // collapse all non-line feed whitespace into a single space
300
        $content = preg_replace('/[^\S\n]+/', ' ', $content);
301
302
        // strip leading & trailing whitespace
303
        $content = str_replace(array(" \n", "\n "), "\n", $content);
304
305
        // collapse consecutive line feeds into just 1
306
        $content = preg_replace('/\n+/', "\n", $content);
307
308
        $operatorsBefore = $this->getOperatorsForRegex($this->operatorsBefore, '/');
309
        $operatorsAfter = $this->getOperatorsForRegex($this->operatorsAfter, '/');
310
        $operators = $this->getOperatorsForRegex($this->operators, '/');
311
        $keywordsBefore = $this->getKeywordsForRegex($this->keywordsBefore, '/');
312
        $keywordsAfter = $this->getKeywordsForRegex($this->keywordsAfter, '/');
313
314
        // strip whitespace that ends in (or next line begin with) an operator
315
        // that allows statements to be broken up over multiple lines
316
        unset($operatorsBefore['+'], $operatorsBefore['-'], $operatorsAfter['+'], $operatorsAfter['-']);
317
        $content = preg_replace(
318
            array(
319
                '/('.implode('|', $operatorsBefore).')\s+/',
320
                '/\s+('.implode('|', $operatorsAfter).')/',
321
            ), '\\1', $content
322
        );
323
324
        // make sure + and - can't be mistaken for, or joined into ++ and --
325
        $content = preg_replace(
326
            array(
327
                '/(?<![\+\-])\s*([\+\-])(?![\+\-])/',
328
                '/(?<![\+\-])([\+\-])\s*(?![\+\-])/',
329
            ), '\\1', $content
330
        );
331
332
        // collapse whitespace around reserved words into single space
333
        $content = preg_replace('/(^|[;\}\s])\K('.implode('|', $keywordsBefore).')\s+/', '\\2 ', $content);
334
        $content = preg_replace('/\s+('.implode('|', $keywordsAfter).')(?=([;\{\s]|$))/', ' \\1', $content);
335
336
        /*
337
         * We didn't strip whitespace after a couple of operators because they
338
         * could be used in different contexts and we can't be sure it's ok to
339
         * strip the newlines. However, we can safely strip any non-line feed
340
         * whitespace that follows them.
341
         */
342
        $operatorsDiffBefore = array_diff($operators, $operatorsBefore);
343
        $operatorsDiffAfter = array_diff($operators, $operatorsAfter);
344
        $content = preg_replace('/('.implode('|', $operatorsDiffBefore).')[^\S\n]+/', '\\1', $content);
345
        $content = preg_replace('/[^\S\n]+('.implode('|', $operatorsDiffAfter).')/', '\\1', $content);
346
347
        /*
348
         * Whitespace after `return` can be omitted in a few occasions
349
         * (such as when followed by a string or regex)
350
         */
351
        $content = preg_replace('/\breturn\s+(["\'\/\+\-])/', 'return$1', $content);
352
353
        /*
354
         * Get rid of double semicolons, except where they can be used like:
355
         * "for(v=1,_=b;;)", "for(v=1;;v++)" or "for(;;ja||(ja=true))".
356
         * I'll safeguard these double semicolons inside for-loops by
357
         * temporarily replacing them with an invalid condition: they won't have
358
         * a double semicolon and will be easy to spot to restore afterwards.
359
         */
360
        $content = preg_replace('/\bfor\(([^;]*);;([^;]*)\)/', 'for(\\1;-;\\2)', $content);
361
        $content = preg_replace('/;+/', ';', $content);
362
        $content = preg_replace('/\bfor\(([^;]*);-;([^;]*)\)/', 'for(\\1;;\\2)', $content);
363
364
        /*
365
         * Next, we'll be removing all semicolons where ASI kicks in.
366
         * for-loops however, can have an empty body (ending in only a
367
         * semicolon), like: `for(i=1;i<3;i++);`, of `for(i in list);`
368
         * Here, nothing happens during the loop; it's just used to keep
369
         * increasing `i`. With that ; omitted, the next line would be expected
370
         * to be the for-loop's body... Same goes for while loops.
371
         * I'm going to double that semicolon (if any) so after the next line,
372
         * which strips semicolons here & there, we're still left with this one.
373
         */
374
        $content = preg_replace('/(for\([^;\{]*;[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\2', $content);
375
        $content = preg_replace('/(for\([^;\{]+\s+in\s+[^;\{]+\));(\}|$)/s', '\\1;;\\2', $content);
376
        /*
377
         * Below will also keep `;` after a `do{}while();` along with `while();`
378
         * While these could be stripped after do-while, detecting this
379
         * distinction is cumbersome, so I'll play it safe and make sure `;`
380
         * after any kind of `while` is kept.
381
         */
382
        $content = preg_replace('/(while\([^;\{]+\));(\}|$)/s', '\\1;;\\2', $content);
383
384
        /*
385
         * We also can't strip empty else-statements. Even though they're
386
         * useless and probably shouldn't be in the code in the first place, we
387
         * shouldn't be stripping the `;` that follows it as it breaks the code.
388
         * We can just remove those useless else-statements completely.
389
         *
390
         * @see https://github.com/matthiasmullie/minify/issues/91
391
         */
392
        $content = preg_replace('/else;/s', '', $content);
393
394
        /*
395
         * We also don't really want to terminate statements followed by closing
396
         * curly braces (which we've ignored completely up until now) or end-of-
397
         * script: ASI will kick in here & we're all about minifying.
398
         * Semicolons at beginning of the file don't make any sense either.
399
         */
400
        $content = preg_replace('/;(\}|$)/s', '\\1', $content);
401
        $content = ltrim($content, ';');
402
403
        // get rid of remaining whitespace af beginning/end
404
        return trim($content);
405
    }
406
407
    /**
408
     * We'll strip whitespace around certain operators with regular expressions.
409
     * This will prepare the given array by escaping all characters.
410
     *
411
     * @param string[] $operators
412
     * @param string   $delimiter
413
     *
414
     * @return string[]
415
     */
416
    protected function getOperatorsForRegex(array $operators, $delimiter = '/')
417
    {
418
        // escape operators for use in regex
419
        $delimiters = array_fill(0, count($operators), $delimiter);
420
        $escaped = array_map('preg_quote', $operators, $delimiters);
421
422
        $operators = array_combine($operators, $escaped);
423
424
        // ignore + & - for now, they'll get special treatment
425
        unset($operators['+'], $operators['-']);
426
427
        // dot can not just immediately follow a number; it can be confused for
428
        // decimal point, or calling a method on it, e.g. 42 .toString()
429
        $operators['.'] = '(?<![0-9]\s)\.';
430
431
        // don't confuse = with other assignment shortcuts (e.g. +=)
432
        $chars = preg_quote('+-*\=<>%&|', $delimiter);
433
        $operators['='] = '(?<!['.$chars.'])\=';
434
435
        return $operators;
436
    }
437
438
    /**
439
     * We'll strip whitespace around certain keywords with regular expressions.
440
     * This will prepare the given array by escaping all characters.
441
     *
442
     * @param string[] $keywords
443
     * @param string   $delimiter
444
     *
445
     * @return string[]
446
     */
447
    protected function getKeywordsForRegex(array $keywords, $delimiter = '/')
448
    {
449
        // escape keywords for use in regex
450
        $delimiter = array_fill(0, count($keywords), $delimiter);
451
        $escaped = array_map('preg_quote', $keywords, $delimiter);
452
453
        // add word boundaries
454
        array_walk($keywords, function ($value) {
455
            return '\b'.$value.'\b';
456
        });
457
458
        $keywords = array_combine($keywords, $escaped);
459
460
        return $keywords;
461
    }
462
463
    /**
464
     * Replaces all occurrences of array['key'] by array.key.
465
     *
466
     * @param string $content
467
     *
468
     * @return string
469
     */
470
    protected function propertyNotation($content)
471
    {
472
        // PHP only supports $this inside anonymous functions since 5.4
473
        $minifier = $this;
474
        $keywords = $this->keywordsReserved;
475
        $callback = function ($match) use ($minifier, $keywords) {
476
            $property = trim($minifier->extracted[$match[1]], '\'"');
477
478
            /*
479
             * Check if the property is a reserved keyword. In this context (as
480
             * property of an object literal/array) it shouldn't matter, but IE8
481
             * freaks out with "Expected identifier".
482
             */
483
            if (in_array($property, $keywords)) {
484
                return $match[0];
485
            }
486
487
            /*
488
             * See if the property is in a variable-like format (e.g.
489
             * array['key-here'] can't be replaced by array.key-here since '-'
490
             * is not a valid character there.
491
             */
492
            if (!preg_match('/^'.$minifier::REGEX_VARIABLE.'$/u', $property)) {
493
                return $match[0];
494
            }
495
496
            return '.'.$property;
497
        };
498
499
        /*
500
         * Figure out if previous character is a variable name (of the array
501
         * we want to use property notation on) - this is to make sure
502
         * standalone ['value'] arrays aren't confused for keys-of-an-array.
503
         * We can (and only have to) check the last character, because PHP's
504
         * regex implementation doesn't allow unfixed-length look-behind
505
         * assertions.
506
         */
507
        preg_match('/(\[[^\]]+\])[^\]]*$/', static::REGEX_VARIABLE, $previousChar);
508
        $previousChar = $previousChar[1];
509
510
        /*
511
         * Make sure word preceding the ['value'] is not a keyword, e.g.
512
         * return['x']. Because -again- PHP's regex implementation doesn't allow
513
         * unfixed-length look-behind assertions, I'm just going to do a lot of
514
         * separate look-behind assertions, one for each keyword.
515
         */
516
        $keywords = $this->getKeywordsForRegex($keywords);
517
        $keywords = '(?<!'.implode(')(?<!', $keywords).')';
518
519
        return preg_replace_callback('/(?<='.$previousChar.'|\])'.$keywords.'\[\s*(([\'"])[0-9]+\\2)\s*\]/u', $callback, $content);
520
    }
521
522
    /**
523
     * Replaces true & false by !0 and !1.
524
     *
525
     * @param string $content
526
     *
527
     * @return string
528
     */
529
    protected function shortenBools($content)
530
    {
531
        /*
532
         * 'true' or 'false' could be used as property names (which may be
533
         * followed by whitespace) - we must not replace those!
534
         * Since PHP doesn't allow variable-length (to account for the
535
         * whitespace) lookbehind assertions, I need to capture the leading
536
         * character and check if it's a `.`
537
         */
538
        $callback = function ($match) {
539
            if (trim($match[1]) === '.') {
540
                return $match[0];
541
            }
542
543
            return $match[1].($match[2] === 'true' ? '!0' : '!1');
544
        };
545
        $content = preg_replace_callback('/(^|.\s*)\b(true|false)\b(?!:)/', $callback, $content);
546
547
        // for(;;) is exactly the same as while(true), but shorter :)
548
        $content = preg_replace('/\bwhile\(!0\){/', 'for(;;){', $content);
549
550
        // now make sure we didn't turn any do ... while(true) into do ... for(;;)
551
        preg_match_all('/\bdo\b/', $content, $dos, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
552
553
        // go backward to make sure positional offsets aren't altered when $content changes
554
        $dos = array_reverse($dos);
555
        foreach ($dos as $do) {
556
            $offsetDo = $do[0][1];
557
558
            // find all `while` (now `for`) following `do`: one of those must be
559
            // associated with the `do` and be turned back into `while`
560
            preg_match_all('/\bfor\(;;\)/', $content, $whiles, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offsetDo);
561
            foreach ($whiles as $while) {
562
                $offsetWhile = $while[0][1];
563
564
                $open = substr_count($content, '{', $offsetDo, $offsetWhile - $offsetDo);
565
                $close = substr_count($content, '}', $offsetDo, $offsetWhile - $offsetDo);
566
                if ($open === $close) {
567
                    // only restore `while` if amount of `{` and `}` are the same;
568
                    // otherwise, that `for` isn't associated with this `do`
569
                    $content = substr_replace($content, 'while(!0)', $offsetWhile, strlen('for(;;)'));
570
                    break;
571
                }
572
            }
573
        }
574
575
        return $content;
576
    }
577
}
578