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<?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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/** |
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* Full list of JavaScript reserved words. |
38
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* Will be loaded from /data/js/keywords_reserved.txt. |
39
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* |
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* @see https://mathiasbynens.be/notes/reserved-keywords |
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* |
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* @var string[] |
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*/ |
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protected $keywordsReserved = array(); |
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46
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/** |
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* List of JavaScript reserved words that accept a <variable, value, ...> |
48
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* after them. Some end of lines are not the end of a statement, like with |
49
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* these keywords. |
50
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* |
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* E.g.: we shouldn't insert a ; after this else |
52
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* else |
53
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* console.log('this is quite fine') |
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* |
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* Will be loaded from /data/js/keywords_before.txt |
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* |
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* @var string[] |
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*/ |
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protected $keywordsBefore = array(); |
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61
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/** |
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* List of JavaScript reserved words that accept a <variable, value, ...> |
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* before them. Some end of lines are not the end of a statement, like when |
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* continued by one of these keywords on the newline. |
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* |
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* E.g.: we shouldn't insert a ; before this instanceof |
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* variable |
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* instanceof String |
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* |
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* Will be loaded from /data/js/keywords_after.txt |
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* |
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* @var string[] |
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*/ |
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protected $keywordsAfter = array(); |
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/** |
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* List of all JavaScript operators. |
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* |
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* Will be loaded from /data/js/operators.txt |
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* |
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* @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators |
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* |
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* @var string[] |
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*/ |
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protected $operators = array(); |
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/** |
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* List of JavaScript operators that accept a <variable, value, ...> after |
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* them. Some end of lines are not the end of a statement, like with these |
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* operators. |
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* |
92
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* Note: Most operators are fine, we've only removed ++ and --. |
93
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* ++ & -- have to be joined with the value they're in-/decrementing. |
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* |
95
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* Will be loaded from /data/js/operators_before.txt |
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* |
97
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* @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators |
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* |
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* @var string[] |
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*/ |
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protected $operatorsBefore = array(); |
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103
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/** |
104
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* List of JavaScript operators that accept a <variable, value, ...> before |
105
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* them. Some end of lines are not the end of a statement, like when |
106
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* continued by one of these operators on the newline. |
107
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* |
108
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* Note: Most operators are fine, we've only removed ), ], ++, --, ! and ~. |
109
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* There can't be a newline separating ! or ~ and whatever it is negating. |
110
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* ++ & -- have to be joined with the value they're in-/decrementing. |
111
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* ) & ] are "special" in that they have lots or usecases. () for example |
112
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* is used for function calls, for grouping, in if () and for (), ... |
113
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* |
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* Will be loaded from /data/js/operators_after.txt |
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* |
116
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* @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators |
117
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* |
118
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* @var string[] |
119
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*/ |
120
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protected $operatorsAfter = array(); |
121
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122
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/** |
123
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* {@inheritdoc} |
124
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*/ |
125
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public function __construct() |
126
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{ |
127
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call_user_func_array(array('parent', '__construct'), func_get_args()); |
128
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129
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$dataDir = __DIR__.'/../data/js/'; |
130
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$options = FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES; |
131
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$this->keywordsReserved = file($dataDir.'keywords_reserved.txt', $options); |
132
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$this->keywordsBefore = file($dataDir.'keywords_before.txt', $options); |
133
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$this->keywordsAfter = file($dataDir.'keywords_after.txt', $options); |
134
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$this->operators = file($dataDir.'operators.txt', $options); |
135
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$this->operatorsBefore = file($dataDir.'operators_before.txt', $options); |
136
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$this->operatorsAfter = file($dataDir.'operators_after.txt', $options); |
137
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} |
138
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139
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/** |
140
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* Minify the data. |
141
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* Perform JS optimizations. |
142
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* |
143
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* @param string[optional] $path Path to write the data to |
144
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* |
145
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* @return string The minified data |
146
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*/ |
147
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public function execute($path = null) |
148
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{ |
149
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$content = ''; |
150
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151
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/* |
152
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* Let's first take out strings, comments and regular expressions. |
153
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* All of these can contain JS code-like characters, and we should make |
154
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* sure any further magic ignores anything inside of these. |
155
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* |
156
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* Consider this example, where we should not strip any whitespace: |
157
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* var str = "a test"; |
158
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* |
159
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* Comments will be removed altogether, strings and regular expressions |
160
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* will be replaced by placeholder text, which we'll restore later. |
161
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*/ |
162
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$this->extractStrings('\'"`'); |
163
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$this->stripComments(); |
164
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$this->extractRegex(); |
165
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166
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// loop files |
167
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|
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foreach ($this->data as $source => $js) { |
168
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// take out strings, comments & regex (for which we've registered |
169
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// the regexes just a few lines earlier) |
170
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|
|
$js = $this->replace($js); |
171
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172
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|
$js = $this->propertyNotation($js); |
173
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|
$js = $this->shortenBools($js); |
174
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|
$js = $this->stripWhitespace($js); |
175
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176
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|
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// combine js: separating the scripts by a ; |
177
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|
|
$content .= $js.";"; |
178
|
|
|
} |
179
|
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|
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180
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|
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// clean up leftover `;`s from the combination of multiple scripts |
181
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|
|
$content = ltrim($content, ';'); |
182
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|
|
$content = (string) substr($content, 0, -1); |
183
|
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184
|
|
|
/* |
185
|
|
|
* Earlier, we extracted strings & regular expressions and replaced them |
186
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|
|
* with placeholder text. This will restore them. |
187
|
|
|
*/ |
188
|
|
|
$content = $this->restoreExtractedData($content); |
189
|
|
|
|
190
|
|
|
return $content; |
191
|
|
|
} |
192
|
|
|
|
193
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|
|
/** |
194
|
|
|
* Strip comments from source code. |
195
|
|
|
*/ |
196
|
|
|
protected function stripComments() |
197
|
|
|
{ |
198
|
|
|
// PHP only supports $this inside anonymous functions since 5.4 |
199
|
|
|
$minifier = $this; |
200
|
|
|
$callback = function ($match) use ($minifier) { |
201
|
|
|
if ( |
202
|
|
|
substr($match[1], 0, 1) === '!' || |
203
|
|
|
strpos($match[1], '@license') !== false || |
204
|
|
|
strpos($match[1], '@preserve') !== false |
205
|
|
|
) { |
206
|
|
|
// preserve multi-line comments that start with /*! |
207
|
|
|
// or contain @license or @preserve annotations |
208
|
|
|
$count = count($minifier->extracted); |
209
|
|
|
$placeholder = '/*'.$count.'*/'; |
210
|
|
|
$minifier->extracted[$placeholder] = $match[0]; |
211
|
|
|
|
212
|
|
|
return $placeholder; |
213
|
|
|
} |
214
|
|
|
|
215
|
|
|
return ''; |
216
|
|
|
}; |
217
|
|
|
|
218
|
|
|
// multi-line comments |
219
|
|
|
$this->registerPattern('/\n?\/\*(.*?)\*\/\n?/s', $callback); |
220
|
|
|
|
221
|
|
|
// single-line comments |
222
|
|
|
$this->registerPattern('/\/\/.*$/m', ''); |
223
|
|
|
} |
224
|
|
|
|
225
|
|
|
/** |
226
|
|
|
* JS can have /-delimited regular expressions, like: /ab+c/.match(string). |
227
|
|
|
* |
228
|
|
|
* The content inside the regex can contain characters that may be confused |
229
|
|
|
* for JS code: e.g. it could contain whitespace it needs to match & we |
230
|
|
|
* don't want to strip whitespace in there. |
231
|
|
|
* |
232
|
|
|
* The regex can be pretty simple: we don't have to care about comments, |
233
|
|
|
* (which also use slashes) because stripComments() will have stripped those |
234
|
|
|
* already. |
235
|
|
|
* |
236
|
|
|
* This method will replace all string content with simple REGEX# |
237
|
|
|
* placeholder text, so we've rid all regular expressions from characters |
238
|
|
|
* that may be misinterpreted. Original regex content will be saved in |
239
|
|
|
* $this->extracted and after doing all other minifying, we can restore the |
240
|
|
|
* original content via restoreRegex() |
241
|
|
|
*/ |
242
|
|
|
protected function extractRegex() |
243
|
|
|
{ |
244
|
|
|
// PHP only supports $this inside anonymous functions since 5.4 |
245
|
|
|
$minifier = $this; |
246
|
|
|
$callback = function ($match) use ($minifier) { |
247
|
|
|
$count = count($minifier->extracted); |
248
|
|
|
$placeholder = '"'.$count.'"'; |
249
|
|
|
$minifier->extracted[$placeholder] = $match[0]; |
250
|
|
|
|
251
|
|
|
return $placeholder; |
252
|
|
|
}; |
253
|
|
|
|
254
|
|
|
// match all chars except `/` and `\` |
255
|
|
|
// `\` is allowed though, along with whatever char follows (which is the |
256
|
|
|
// one being escaped) |
257
|
|
|
// this should allow all chars, except for an unescaped `/` (= the one |
258
|
|
|
// closing the regex) |
259
|
|
|
// then also ignore bare `/` inside `[]`, where they don't need to be |
260
|
|
|
// escaped: anything inside `[]` can be ignored safely |
261
|
|
|
$pattern = '\\/(?!\*)(?:[^\\[\\/\\\\\n\r]++|(?:\\\\.)++|(?:\\[(?:[^\\]\\\\\n\r]++|(?:\\\\.)++)++\\])++)++\\/[gimuy]*'; |
262
|
|
|
|
263
|
|
|
// a regular expression can only be followed by a few operators or some |
264
|
|
|
// of the RegExp methods (a `\` followed by a variable or value is |
265
|
|
|
// likely part of a division, not a regex) |
266
|
|
|
$keywords = array('do', 'in', 'new', 'else', 'throw', 'yield', 'delete', 'return', 'typeof'); |
267
|
|
|
$before = '(^|[=:,;\+\-\*\/\}\(\{\[&\|!]|'.implode('|', $keywords).')\s*'; |
268
|
|
|
$propertiesAndMethods = array( |
269
|
|
|
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties_2 |
270
|
|
|
'constructor', |
271
|
|
|
'flags', |
272
|
|
|
'global', |
273
|
|
|
'ignoreCase', |
274
|
|
|
'multiline', |
275
|
|
|
'source', |
276
|
|
|
'sticky', |
277
|
|
|
'unicode', |
278
|
|
|
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2 |
279
|
|
|
'compile(', |
280
|
|
|
'exec(', |
281
|
|
|
'test(', |
282
|
|
|
'toSource(', |
283
|
|
|
'toString(', |
284
|
|
|
); |
285
|
|
|
$delimiters = array_fill(0, count($propertiesAndMethods), '/'); |
286
|
|
|
$propertiesAndMethods = array_map('preg_quote', $propertiesAndMethods, $delimiters); |
287
|
|
|
$after = '(?=\s*([\.,;\)\}&\|+]|\/\/|$|\.('.implode('|', $propertiesAndMethods).')))'; |
288
|
|
|
$this->registerPattern('/'.$before.'\K'.$pattern.$after.'/', $callback); |
289
|
|
|
|
290
|
|
|
// regular expressions following a `)` are rather annoying to detect... |
291
|
|
|
// quite often, `/` after `)` is a division operator & if it happens to |
292
|
|
|
// be followed by another one (or a comment), it is likely to be |
293
|
|
|
// confused for a regular expression |
294
|
|
|
// however, it's perfectly possible for a regex to follow a `)`: after |
295
|
|
|
// a single-line `if()`, `while()`, ... statement, for example |
296
|
|
|
// since, when they occur like that, they're always the start of a |
297
|
|
|
// statement, there's only a limited amount of ways they can be useful: |
298
|
|
|
// by calling the regex methods directly |
299
|
|
|
// if a regex following `)` is not followed by `.<property or method>`, |
300
|
|
|
// it's quite likely not a regex |
301
|
|
|
$before = '\)\s*'; |
302
|
|
|
$after = '(?=\s*\.('.implode('|', $propertiesAndMethods).'))'; |
303
|
|
|
$this->registerPattern('/'.$before.'\K'.$pattern.$after.'/', $callback); |
304
|
|
|
|
305
|
|
|
// 1 more edge case: a regex can be followed by a lot more operators or |
306
|
|
|
// keywords if there's a newline (ASI) in between, where the operator |
307
|
|
|
// actually starts a new statement |
308
|
|
|
// (https://github.com/matthiasmullie/minify/issues/56) |
309
|
|
|
$operators = $this->getOperatorsForRegex($this->operatorsBefore, '/'); |
310
|
|
|
$operators += $this->getOperatorsForRegex($this->keywordsReserved, '/'); |
311
|
|
|
$after = '(?=\s*\n\s*('.implode('|', $operators).'))'; |
312
|
|
|
$this->registerPattern('/'.$pattern.$after.'/', $callback); |
313
|
|
|
} |
314
|
|
|
|
315
|
|
|
/** |
316
|
|
|
* Strip whitespace. |
317
|
|
|
* |
318
|
|
|
* We won't strip *all* whitespace, but as much as possible. The thing that |
319
|
|
|
* we'll preserve are newlines we're unsure about. |
320
|
|
|
* JavaScript doesn't require statements to be terminated with a semicolon. |
321
|
|
|
* It will automatically fix missing semicolons with ASI (automatic semi- |
322
|
|
|
* colon insertion) at the end of line causing errors (without semicolon.) |
323
|
|
|
* |
324
|
|
|
* Because it's sometimes hard to tell if a newline is part of a statement |
325
|
|
|
* that should be terminated or not, we'll just leave some of them alone. |
326
|
|
|
* |
327
|
|
|
* @param string $content The content to strip the whitespace for |
328
|
|
|
* |
329
|
|
|
* @return string |
330
|
|
|
*/ |
331
|
|
|
protected function stripWhitespace($content) |
332
|
|
|
{ |
333
|
|
|
// uniform line endings, make them all line feed |
334
|
|
|
$content = str_replace(array("\r\n", "\r"), "\n", $content); |
335
|
|
|
|
336
|
|
|
// collapse all non-line feed whitespace into a single space |
337
|
|
|
$content = preg_replace('/[^\S\n]+/', ' ', $content); |
338
|
|
|
|
339
|
|
|
// strip leading & trailing whitespace |
340
|
|
|
$content = str_replace(array(" \n", "\n "), "\n", $content); |
341
|
|
|
|
342
|
|
|
// collapse consecutive line feeds into just 1 |
343
|
|
|
$content = preg_replace('/\n+/', "\n", $content); |
344
|
|
|
|
345
|
|
|
$operatorsBefore = $this->getOperatorsForRegex($this->operatorsBefore, '/'); |
346
|
|
|
$operatorsAfter = $this->getOperatorsForRegex($this->operatorsAfter, '/'); |
347
|
|
|
$operators = $this->getOperatorsForRegex($this->operators, '/'); |
348
|
|
|
$keywordsBefore = $this->getKeywordsForRegex($this->keywordsBefore, '/'); |
349
|
|
|
$keywordsAfter = $this->getKeywordsForRegex($this->keywordsAfter, '/'); |
350
|
|
|
|
351
|
|
|
// strip whitespace that ends in (or next line begin with) an operator |
352
|
|
|
// that allows statements to be broken up over multiple lines |
353
|
|
|
unset($operatorsBefore['+'], $operatorsBefore['-'], $operatorsAfter['+'], $operatorsAfter['-']); |
354
|
|
|
$content = preg_replace( |
355
|
|
|
array( |
356
|
|
|
'/('.implode('|', $operatorsBefore).')\s+/', |
357
|
|
|
'/\s+('.implode('|', $operatorsAfter).')/', |
358
|
|
|
), |
359
|
|
|
'\\1', |
360
|
|
|
$content |
361
|
|
|
); |
362
|
|
|
|
363
|
|
|
// make sure + and - can't be mistaken for, or joined into ++ and -- |
364
|
|
|
$content = preg_replace( |
365
|
|
|
array( |
366
|
|
|
'/(?<![\+\-])\s*([\+\-])(?![\+\-])/', |
367
|
|
|
'/(?<![\+\-])([\+\-])\s*(?![\+\-])/', |
368
|
|
|
), |
369
|
|
|
'\\1', |
370
|
|
|
$content |
371
|
|
|
); |
372
|
|
|
|
373
|
|
|
// collapse whitespace around reserved words into single space |
374
|
|
|
$content = preg_replace('/(^|[;\}\s])\K('.implode('|', $keywordsBefore).')\s+/', '\\2 ', $content); |
375
|
|
|
$content = preg_replace('/\s+('.implode('|', $keywordsAfter).')(?=([;\{\s]|$))/', ' \\1', $content); |
376
|
|
|
|
377
|
|
|
/* |
378
|
|
|
* We didn't strip whitespace after a couple of operators because they |
379
|
|
|
* could be used in different contexts and we can't be sure it's ok to |
380
|
|
|
* strip the newlines. However, we can safely strip any non-line feed |
381
|
|
|
* whitespace that follows them. |
382
|
|
|
*/ |
383
|
|
|
$operatorsDiffBefore = array_diff($operators, $operatorsBefore); |
384
|
|
|
$operatorsDiffAfter = array_diff($operators, $operatorsAfter); |
385
|
|
|
$content = preg_replace('/('.implode('|', $operatorsDiffBefore).')[^\S\n]+/', '\\1', $content); |
386
|
|
|
$content = preg_replace('/[^\S\n]+('.implode('|', $operatorsDiffAfter).')/', '\\1', $content); |
387
|
|
|
|
388
|
|
|
/* |
389
|
|
|
* Whitespace after `return` can be omitted in a few occasions |
390
|
|
|
* (such as when followed by a string or regex) |
391
|
|
|
* Same for whitespace in between `)` and `{`, or between `{` and some |
392
|
|
|
* keywords. |
393
|
|
|
*/ |
394
|
|
|
$content = preg_replace('/\breturn\s+(["\'\/\+\-])/', 'return$1', $content); |
395
|
|
|
$content = preg_replace('/\)\s+\{/', '){', $content); |
396
|
|
|
$content = preg_replace('/}\n(else|catch|finally)\b/', '}$1', $content); |
397
|
|
|
|
398
|
|
|
/* |
399
|
|
|
* Get rid of double semicolons, except where they can be used like: |
400
|
|
|
* "for(v=1,_=b;;)", "for(v=1;;v++)" or "for(;;ja||(ja=true))". |
401
|
|
|
* I'll safeguard these double semicolons inside for-loops by |
402
|
|
|
* temporarily replacing them with an invalid condition: they won't have |
403
|
|
|
* a double semicolon and will be easy to spot to restore afterwards. |
404
|
|
|
*/ |
405
|
|
|
$content = preg_replace('/\bfor\(([^;]*);;([^;]*)\)/', 'for(\\1;-;\\2)', $content); |
406
|
|
|
$content = preg_replace('/;+/', ';', $content); |
407
|
|
|
$content = preg_replace('/\bfor\(([^;]*);-;([^;]*)\)/', 'for(\\1;;\\2)', $content); |
408
|
|
|
|
409
|
|
|
/* |
410
|
|
|
* Next, we'll be removing all semicolons where ASI kicks in. |
411
|
|
|
* for-loops however, can have an empty body (ending in only a |
412
|
|
|
* semicolon), like: `for(i=1;i<3;i++);`, of `for(i in list);` |
413
|
|
|
* Here, nothing happens during the loop; it's just used to keep |
414
|
|
|
* increasing `i`. With that ; omitted, the next line would be expected |
415
|
|
|
* to be the for-loop's body... Same goes for while loops. |
416
|
|
|
* I'm going to double that semicolon (if any) so after the next line, |
417
|
|
|
* which strips semicolons here & there, we're still left with this one. |
418
|
|
|
*/ |
419
|
|
|
$content = preg_replace('/(for\([^;\{]*;[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\2', $content); |
420
|
|
|
$content = preg_replace('/(for\([^;\{]+\s+in\s+[^;\{]+\));(\}|$)/s', '\\1;;\\2', $content); |
421
|
|
|
/* |
422
|
|
|
* Below will also keep `;` after a `do{}while();` along with `while();` |
423
|
|
|
* While these could be stripped after do-while, detecting this |
424
|
|
|
* distinction is cumbersome, so I'll play it safe and make sure `;` |
425
|
|
|
* after any kind of `while` is kept. |
426
|
|
|
*/ |
427
|
|
|
$content = preg_replace('/(while\([^;\{]+\));(\}|$)/s', '\\1;;\\2', $content); |
428
|
|
|
|
429
|
|
|
/* |
430
|
|
|
* We also can't strip empty else-statements. Even though they're |
431
|
|
|
* useless and probably shouldn't be in the code in the first place, we |
432
|
|
|
* shouldn't be stripping the `;` that follows it as it breaks the code. |
433
|
|
|
* We can just remove those useless else-statements completely. |
434
|
|
|
* |
435
|
|
|
* @see https://github.com/matthiasmullie/minify/issues/91 |
436
|
|
|
*/ |
437
|
|
|
$content = preg_replace('/else;/s', '', $content); |
438
|
|
|
|
439
|
|
|
/* |
440
|
|
|
* We also don't really want to terminate statements followed by closing |
441
|
|
|
* curly braces (which we've ignored completely up until now) or end-of- |
442
|
|
|
* script: ASI will kick in here & we're all about minifying. |
443
|
|
|
* Semicolons at beginning of the file don't make any sense either. |
444
|
|
|
*/ |
445
|
|
|
$content = preg_replace('/;(\}|$)/s', '\\1', $content); |
446
|
|
|
$content = ltrim($content, ';'); |
447
|
|
|
|
448
|
|
|
// get rid of remaining whitespace af beginning/end |
449
|
|
|
return trim($content); |
450
|
|
|
} |
451
|
|
|
|
452
|
|
|
/** |
453
|
|
|
* We'll strip whitespace around certain operators with regular expressions. |
454
|
|
|
* This will prepare the given array by escaping all characters. |
455
|
|
|
* |
456
|
|
|
* @param string[] $operators |
457
|
|
|
* @param string $delimiter |
458
|
|
|
* |
459
|
|
|
* @return string[] |
460
|
|
|
*/ |
461
|
|
|
protected function getOperatorsForRegex(array $operators, $delimiter = '/') |
462
|
|
|
{ |
463
|
|
|
// escape operators for use in regex |
464
|
|
|
$delimiters = array_fill(0, count($operators), $delimiter); |
465
|
|
|
$escaped = array_map('preg_quote', $operators, $delimiters); |
466
|
|
|
|
467
|
|
|
$operators = array_combine($operators, $escaped); |
468
|
|
|
|
469
|
|
|
// ignore + & - for now, they'll get special treatment |
470
|
|
|
unset($operators['+'], $operators['-']); |
471
|
|
|
|
472
|
|
|
// dot can not just immediately follow a number; it can be confused for |
473
|
|
|
// decimal point, or calling a method on it, e.g. 42 .toString() |
474
|
|
|
$operators['.'] = '(?<![0-9]\s)\.'; |
475
|
|
|
|
476
|
|
|
// don't confuse = with other assignment shortcuts (e.g. +=) |
477
|
|
|
$chars = preg_quote('+-*\=<>%&|', $delimiter); |
478
|
|
|
$operators['='] = '(?<!['.$chars.'])\='; |
479
|
|
|
|
480
|
|
|
return $operators; |
481
|
|
|
} |
482
|
|
|
|
483
|
|
|
/** |
484
|
|
|
* We'll strip whitespace around certain keywords with regular expressions. |
485
|
|
|
* This will prepare the given array by escaping all characters. |
486
|
|
|
* |
487
|
|
|
* @param string[] $keywords |
488
|
|
|
* @param string $delimiter |
489
|
|
|
* |
490
|
|
|
* @return string[] |
491
|
|
|
*/ |
492
|
|
|
protected function getKeywordsForRegex(array $keywords, $delimiter = '/') |
493
|
|
|
{ |
494
|
|
|
// escape keywords for use in regex |
495
|
|
|
$delimiter = array_fill(0, count($keywords), $delimiter); |
496
|
|
|
$escaped = array_map('preg_quote', $keywords, $delimiter); |
497
|
|
|
|
498
|
|
|
// add word boundaries |
499
|
|
|
array_walk($keywords, function ($value) { |
500
|
|
|
return '\b'.$value.'\b'; |
501
|
|
|
}); |
502
|
|
|
|
503
|
|
|
$keywords = array_combine($keywords, $escaped); |
504
|
|
|
|
505
|
|
|
return $keywords; |
506
|
|
|
} |
507
|
|
|
|
508
|
|
|
/** |
509
|
|
|
* Replaces all occurrences of array['key'] by array.key. |
510
|
|
|
* |
511
|
|
|
* @param string $content |
512
|
|
|
* |
513
|
|
|
* @return string |
514
|
|
|
*/ |
515
|
|
|
protected function propertyNotation($content) |
516
|
|
|
{ |
517
|
|
|
// PHP only supports $this inside anonymous functions since 5.4 |
518
|
|
|
$minifier = $this; |
519
|
|
|
$keywords = $this->keywordsReserved; |
520
|
|
|
$callback = function ($match) use ($minifier, $keywords) { |
521
|
|
|
$property = trim($minifier->extracted[$match[1]], '\'"'); |
522
|
|
|
|
523
|
|
|
/* |
524
|
|
|
* Check if the property is a reserved keyword. In this context (as |
525
|
|
|
* property of an object literal/array) it shouldn't matter, but IE8 |
526
|
|
|
* freaks out with "Expected identifier". |
527
|
|
|
*/ |
528
|
|
|
if (in_array($property, $keywords)) { |
529
|
|
|
return $match[0]; |
530
|
|
|
} |
531
|
|
|
|
532
|
|
|
/* |
533
|
|
|
* See if the property is in a variable-like format (e.g. |
534
|
|
|
* array['key-here'] can't be replaced by array.key-here since '-' |
535
|
|
|
* is not a valid character there. |
536
|
|
|
*/ |
537
|
|
|
if (!preg_match('/^'.$minifier::REGEX_VARIABLE.'$/u', $property)) { |
538
|
|
|
return $match[0]; |
539
|
|
|
} |
540
|
|
|
|
541
|
|
|
return '.'.$property; |
542
|
|
|
}; |
543
|
|
|
|
544
|
|
|
/* |
545
|
|
|
* Figure out if previous character is a variable name (of the array |
546
|
|
|
* we want to use property notation on) - this is to make sure |
547
|
|
|
* standalone ['value'] arrays aren't confused for keys-of-an-array. |
548
|
|
|
* We can (and only have to) check the last character, because PHP's |
549
|
|
|
* regex implementation doesn't allow unfixed-length look-behind |
550
|
|
|
* assertions. |
551
|
|
|
*/ |
552
|
|
|
preg_match('/(\[[^\]]+\])[^\]]*$/', static::REGEX_VARIABLE, $previousChar); |
553
|
|
|
$previousChar = $previousChar[1]; |
554
|
|
|
|
555
|
|
|
/* |
556
|
|
|
* Make sure word preceding the ['value'] is not a keyword, e.g. |
557
|
|
|
* return['x']. Because -again- PHP's regex implementation doesn't allow |
558
|
|
|
* unfixed-length look-behind assertions, I'm just going to do a lot of |
559
|
|
|
* separate look-behind assertions, one for each keyword. |
560
|
|
|
*/ |
561
|
|
|
$keywords = $this->getKeywordsForRegex($keywords); |
562
|
|
|
$keywords = '(?<!'.implode(')(?<!', $keywords).')'; |
563
|
|
|
|
564
|
|
|
return preg_replace_callback('/(?<='.$previousChar.'|\])'.$keywords.'\[\s*(([\'"])[0-9]+\\2)\s*\]/u', $callback, $content); |
565
|
|
|
} |
566
|
|
|
|
567
|
|
|
/** |
568
|
|
|
* Replaces true & false by !0 and !1. |
569
|
|
|
* |
570
|
|
|
* @param string $content |
571
|
|
|
* |
572
|
|
|
* @return string |
573
|
|
|
*/ |
574
|
|
|
protected function shortenBools($content) |
575
|
|
|
{ |
576
|
|
|
/* |
577
|
|
|
* 'true' or 'false' could be used as property names (which may be |
578
|
|
|
* followed by whitespace) - we must not replace those! |
579
|
|
|
* Since PHP doesn't allow variable-length (to account for the |
580
|
|
|
* whitespace) lookbehind assertions, I need to capture the leading |
581
|
|
|
* character and check if it's a `.` |
582
|
|
|
*/ |
583
|
|
|
$callback = function ($match) { |
584
|
|
|
if (trim($match[1]) === '.') { |
585
|
|
|
return $match[0]; |
586
|
|
|
} |
587
|
|
|
|
588
|
|
|
return $match[1].($match[2] === 'true' ? '!0' : '!1'); |
589
|
|
|
}; |
590
|
|
|
$content = preg_replace_callback('/(^|.\s*)\b(true|false)\b(?!:)/', $callback, $content); |
591
|
|
|
|
592
|
|
|
// for(;;) is exactly the same as while(true), but shorter :) |
593
|
|
|
$content = preg_replace('/\bwhile\(!0\){/', 'for(;;){', $content); |
594
|
|
|
|
595
|
|
|
// now make sure we didn't turn any do ... while(true) into do ... for(;;) |
596
|
|
|
preg_match_all('/\bdo\b/', $content, $dos, PREG_OFFSET_CAPTURE | PREG_SET_ORDER); |
597
|
|
|
|
598
|
|
|
// go backward to make sure positional offsets aren't altered when $content changes |
599
|
|
|
$dos = array_reverse($dos); |
600
|
|
|
foreach ($dos as $do) { |
601
|
|
|
$offsetDo = $do[0][1]; |
602
|
|
|
|
603
|
|
|
// find all `while` (now `for`) following `do`: one of those must be |
604
|
|
|
// associated with the `do` and be turned back into `while` |
605
|
|
|
preg_match_all('/\bfor\(;;\)/', $content, $whiles, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offsetDo); |
606
|
|
|
foreach ($whiles as $while) { |
607
|
|
|
$offsetWhile = $while[0][1]; |
608
|
|
|
|
609
|
|
|
$open = substr_count($content, '{', $offsetDo, $offsetWhile - $offsetDo); |
610
|
|
|
$close = substr_count($content, '}', $offsetDo, $offsetWhile - $offsetDo); |
611
|
|
|
if ($open === $close) { |
612
|
|
|
// only restore `while` if amount of `{` and `}` are the same; |
613
|
|
|
// otherwise, that `for` isn't associated with this `do` |
614
|
|
|
$content = substr_replace($content, 'while(!0)', $offsetWhile, strlen('for(;;)')); |
615
|
|
|
break; |
616
|
|
|
} |
617
|
|
|
} |
618
|
|
|
} |
619
|
|
|
|
620
|
|
|
return $content; |
621
|
|
|
} |
622
|
|
|
} |
623
|
|
|
|