Rev 1308 | Details | Compare with Previous | Last modification | View Log | RSS feed
| Rev | Author | Line No. | Line |
|---|---|---|---|
| 597 | daniel-mar | 1 | <?php |
| 1042 | daniel-mar | 2 | |
| 597 | daniel-mar | 3 | /** |
| 1042 | daniel-mar | 4 | * JavaScript minifier. |
| 597 | daniel-mar | 5 | * |
| 6 | * Please report bugs on https://github.com/matthiasmullie/minify/issues |
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| 7 | * |
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| 8 | * @author Matthias Mullie <minify@mullie.eu> |
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| 9 | * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved |
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| 10 | * @license MIT License |
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| 11 | */ |
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| 1042 | daniel-mar | 12 | |
| 597 | daniel-mar | 13 | namespace MatthiasMullie\Minify; |
| 14 | |||
| 15 | /** |
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| 1042 | daniel-mar | 16 | * JavaScript Minifier Class. |
| 597 | daniel-mar | 17 | * |
| 18 | * Please report bugs on https://github.com/matthiasmullie/minify/issues |
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| 19 | * |
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| 20 | * @author Matthias Mullie <minify@mullie.eu> |
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| 21 | * @author Tijs Verkoyen <minify@verkoyen.eu> |
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| 22 | * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved |
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| 23 | * @license MIT License |
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| 24 | */ |
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| 25 | class JS extends Minify |
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| 26 | { |
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| 27 | /** |
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| 28 | * Var-matching regex based on http://stackoverflow.com/a/9337047/802993. |
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| 29 | * |
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| 30 | * Note that regular expressions using that bit must have the PCRE_UTF8 |
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| 31 | * pattern modifier (/u) set. |
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| 32 | * |
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| 1042 | daniel-mar | 33 | * @internal |
| 34 | * |
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| 597 | daniel-mar | 35 | * @var string |
| 36 | */ |
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| 37 | const REGEX_VARIABLE = 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|
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| 38 | |||
| 39 | /** |
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| 40 | * Full list of JavaScript reserved words. |
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| 41 | * Will be loaded from /data/js/keywords_reserved.txt. |
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| 42 | * |
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| 43 | * @see https://mathiasbynens.be/notes/reserved-keywords |
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| 44 | * |
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| 45 | * @var string[] |
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| 46 | */ |
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| 47 | protected $keywordsReserved = array(); |
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| 48 | |||
| 49 | /** |
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| 50 | * List of JavaScript reserved words that accept a <variable, value, ...> |
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| 51 | * after them. Some end of lines are not the end of a statement, like with |
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| 52 | * these keywords. |
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| 53 | * |
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| 54 | * E.g.: we shouldn't insert a ; after this else |
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| 55 | * else |
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| 56 | * console.log('this is quite fine') |
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| 57 | * |
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| 58 | * Will be loaded from /data/js/keywords_before.txt |
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| 59 | * |
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| 60 | * @var string[] |
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| 61 | */ |
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| 62 | protected $keywordsBefore = array(); |
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| 63 | |||
| 64 | /** |
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| 65 | * List of JavaScript reserved words that accept a <variable, value, ...> |
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| 66 | * before them. Some end of lines are not the end of a statement, like when |
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| 67 | * continued by one of these keywords on the newline. |
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| 68 | * |
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| 69 | * E.g.: we shouldn't insert a ; before this instanceof |
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| 70 | * variable |
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| 71 | * instanceof String |
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| 72 | * |
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| 73 | * Will be loaded from /data/js/keywords_after.txt |
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| 74 | * |
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| 75 | * @var string[] |
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| 76 | */ |
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| 77 | protected $keywordsAfter = array(); |
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| 78 | |||
| 79 | /** |
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| 80 | * List of all JavaScript operators. |
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| 81 | * |
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| 82 | * Will be loaded from /data/js/operators.txt |
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| 83 | * |
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| 84 | * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators |
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| 85 | * |
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| 86 | * @var string[] |
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| 87 | */ |
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| 88 | protected $operators = array(); |
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| 89 | |||
| 90 | /** |
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| 91 | * List of JavaScript operators that accept a <variable, value, ...> after |
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| 92 | * them. Some end of lines are not the end of a statement, like with these |
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| 93 | * operators. |
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| 94 | * |
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| 95 | * Note: Most operators are fine, we've only removed ++ and --. |
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| 96 | * ++ & -- have to be joined with the value they're in-/decrementing. |
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| 97 | * |
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| 98 | * Will be loaded from /data/js/operators_before.txt |
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| 99 | * |
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| 100 | * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators |
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| 101 | * |
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| 102 | * @var string[] |
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| 103 | */ |
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| 104 | protected $operatorsBefore = array(); |
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| 105 | |||
| 106 | /** |
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| 107 | * List of JavaScript operators that accept a <variable, value, ...> before |
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| 108 | * them. Some end of lines are not the end of a statement, like when |
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| 109 | * continued by one of these operators on the newline. |
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| 110 | * |
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| 111 | * Note: Most operators are fine, we've only removed ), ], ++, --, ! and ~. |
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| 112 | * There can't be a newline separating ! or ~ and whatever it is negating. |
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| 113 | * ++ & -- have to be joined with the value they're in-/decrementing. |
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| 114 | * ) & ] are "special" in that they have lots or usecases. () for example |
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| 115 | * is used for function calls, for grouping, in if () and for (), ... |
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| 116 | * |
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| 117 | * Will be loaded from /data/js/operators_after.txt |
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| 118 | * |
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| 119 | * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators |
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| 120 | * |
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| 121 | * @var string[] |
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| 122 | */ |
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| 123 | protected $operatorsAfter = array(); |
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| 124 | |||
| 125 | public function __construct() |
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| 126 | { |
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| 1042 | daniel-mar | 127 | call_user_func_array(array('\\MatthiasMullie\Minify\\Minify', '__construct'), func_get_args()); |
| 597 | daniel-mar | 128 | |
| 1042 | daniel-mar | 129 | $dataDir = __DIR__ . '/../data/js/'; |
| 597 | daniel-mar | 130 | $options = FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES; |
| 1042 | daniel-mar | 131 | $this->keywordsReserved = file($dataDir . 'keywords_reserved.txt', $options); |
| 132 | $this->keywordsBefore = file($dataDir . 'keywords_before.txt', $options); |
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| 133 | $this->keywordsAfter = file($dataDir . 'keywords_after.txt', $options); |
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| 134 | $this->operators = file($dataDir . 'operators.txt', $options); |
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| 135 | $this->operatorsBefore = file($dataDir . 'operators_before.txt', $options); |
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| 136 | $this->operatorsAfter = file($dataDir . 'operators_after.txt', $options); |
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| 597 | daniel-mar | 137 | } |
| 138 | |||
| 139 | /** |
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| 140 | * Minify the data. |
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| 141 | * Perform JS optimizations. |
||
| 142 | * |
||
| 143 | * @param string[optional] $path Path to write the data to |
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| 144 | * |
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| 145 | * @return string The minified data |
||
| 146 | */ |
||
| 147 | public function execute($path = null) |
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| 148 | { |
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| 149 | $content = ''; |
||
| 150 | |||
| 151 | /* |
||
| 152 | * Let's first take out strings, comments and regular expressions. |
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| 153 | * All of these can contain JS code-like characters, and we should make |
||
| 154 | * sure any further magic ignores anything inside of these. |
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| 155 | * |
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| 156 | * Consider this example, where we should not strip any whitespace: |
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| 157 | * var str = "a test"; |
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| 158 | * |
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| 159 | * Comments will be removed altogether, strings and regular expressions |
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| 160 | * will be replaced by placeholder text, which we'll restore later. |
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| 161 | */ |
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| 162 | $this->extractStrings('\'"`'); |
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| 163 | $this->stripComments(); |
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| 164 | $this->extractRegex(); |
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| 165 | |||
| 166 | // loop files |
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| 167 | foreach ($this->data as $source => $js) { |
||
| 168 | // take out strings, comments & regex (for which we've registered |
||
| 169 | // the regexes just a few lines earlier) |
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| 170 | $js = $this->replace($js); |
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| 171 | |||
| 172 | $js = $this->propertyNotation($js); |
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| 173 | $js = $this->shortenBools($js); |
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| 174 | $js = $this->stripWhitespace($js); |
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| 175 | |||
| 176 | // combine js: separating the scripts by a ; |
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| 1042 | daniel-mar | 177 | $content .= $js . ';'; |
| 597 | daniel-mar | 178 | } |
| 179 | |||
| 180 | // clean up leftover `;`s from the combination of multiple scripts |
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| 181 | $content = ltrim($content, ';'); |
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| 182 | $content = (string) substr($content, 0, -1); |
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| 183 | |||
| 184 | /* |
||
| 185 | * Earlier, we extracted strings & regular expressions and replaced them |
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| 186 | * with placeholder text. This will restore them. |
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| 187 | */ |
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| 188 | $content = $this->restoreExtractedData($content); |
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| 189 | |||
| 190 | return $content; |
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| 191 | } |
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| 192 | |||
| 193 | /** |
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| 194 | * Strip comments from source code. |
||
| 195 | */ |
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| 196 | protected function stripComments() |
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| 197 | { |
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| 1308 | daniel-mar | 198 | $this->stripMultilineComments(); |
| 597 | daniel-mar | 199 | |
| 200 | // single-line comments |
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| 201 | $this->registerPattern('/\/\/.*$/m', ''); |
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| 202 | } |
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| 203 | |||
| 204 | /** |
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| 205 | * JS can have /-delimited regular expressions, like: /ab+c/.match(string). |
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| 206 | * |
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| 207 | * The content inside the regex can contain characters that may be confused |
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| 208 | * for JS code: e.g. it could contain whitespace it needs to match & we |
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| 209 | * don't want to strip whitespace in there. |
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| 210 | * |
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| 211 | * The regex can be pretty simple: we don't have to care about comments, |
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| 212 | * (which also use slashes) because stripComments() will have stripped those |
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| 213 | * already. |
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| 214 | * |
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| 215 | * This method will replace all string content with simple REGEX# |
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| 216 | * placeholder text, so we've rid all regular expressions from characters |
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| 217 | * that may be misinterpreted. Original regex content will be saved in |
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| 218 | * $this->extracted and after doing all other minifying, we can restore the |
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| 219 | * original content via restoreRegex() |
||
| 220 | */ |
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| 221 | protected function extractRegex() |
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| 222 | { |
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| 223 | // PHP only supports $this inside anonymous functions since 5.4 |
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| 224 | $minifier = $this; |
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| 225 | $callback = function ($match) use ($minifier) { |
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| 226 | $count = count($minifier->extracted); |
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| 1042 | daniel-mar | 227 | $placeholder = '"' . $count . '"'; |
| 597 | daniel-mar | 228 | $minifier->extracted[$placeholder] = $match[0]; |
| 229 | |||
| 230 | return $placeholder; |
||
| 231 | }; |
||
| 232 | |||
| 233 | // match all chars except `/` and `\` |
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| 234 | // `\` is allowed though, along with whatever char follows (which is the |
||
| 235 | // one being escaped) |
||
| 236 | // this should allow all chars, except for an unescaped `/` (= the one |
||
| 237 | // closing the regex) |
||
| 238 | // then also ignore bare `/` inside `[]`, where they don't need to be |
||
| 239 | // escaped: anything inside `[]` can be ignored safely |
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| 240 | $pattern = '\\/(?!\*)(?:[^\\[\\/\\\\\n\r]++|(?:\\\\.)++|(?:\\[(?:[^\\]\\\\\n\r]++|(?:\\\\.)++)++\\])++)++\\/[gimuy]*'; |
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| 241 | |||
| 242 | // a regular expression can only be followed by a few operators or some |
||
| 243 | // of the RegExp methods (a `\` followed by a variable or value is |
||
| 244 | // likely part of a division, not a regex) |
||
| 245 | $keywords = array('do', 'in', 'new', 'else', 'throw', 'yield', 'delete', 'return', 'typeof'); |
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| 1042 | daniel-mar | 246 | $before = '(^|[=:,;\+\-\*\?\/\}\(\{\[&\|!]|' . implode('|', $keywords) . ')\s*'; |
| 597 | daniel-mar | 247 | $propertiesAndMethods = array( |
| 248 | // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties_2 |
||
| 249 | 'constructor', |
||
| 250 | 'flags', |
||
| 251 | 'global', |
||
| 252 | 'ignoreCase', |
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| 253 | 'multiline', |
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| 254 | 'source', |
||
| 255 | 'sticky', |
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| 256 | 'unicode', |
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| 257 | // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2 |
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| 258 | 'compile(', |
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| 259 | 'exec(', |
||
| 260 | 'test(', |
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| 261 | 'toSource(', |
||
| 262 | 'toString(', |
||
| 263 | ); |
||
| 264 | $delimiters = array_fill(0, count($propertiesAndMethods), '/'); |
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| 265 | $propertiesAndMethods = array_map('preg_quote', $propertiesAndMethods, $delimiters); |
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| 1042 | daniel-mar | 266 | $after = '(?=\s*([\.,;:\)\}&\|+]|\/\/|$|\.(' . implode('|', $propertiesAndMethods) . ')))'; |
| 267 | $this->registerPattern('/' . $before . '\K' . $pattern . $after . '/', $callback); |
||
| 597 | daniel-mar | 268 | |
| 269 | // regular expressions following a `)` are rather annoying to detect... |
||
| 270 | // quite often, `/` after `)` is a division operator & if it happens to |
||
| 271 | // be followed by another one (or a comment), it is likely to be |
||
| 272 | // confused for a regular expression |
||
| 273 | // however, it's perfectly possible for a regex to follow a `)`: after |
||
| 274 | // a single-line `if()`, `while()`, ... statement, for example |
||
| 275 | // since, when they occur like that, they're always the start of a |
||
| 276 | // statement, there's only a limited amount of ways they can be useful: |
||
| 277 | // by calling the regex methods directly |
||
| 278 | // if a regex following `)` is not followed by `.<property or method>`, |
||
| 279 | // it's quite likely not a regex |
||
| 280 | $before = '\)\s*'; |
||
| 1042 | daniel-mar | 281 | $after = '(?=\s*\.(' . implode('|', $propertiesAndMethods) . '))'; |
| 282 | $this->registerPattern('/' . $before . '\K' . $pattern . $after . '/', $callback); |
||
| 597 | daniel-mar | 283 | |
| 284 | // 1 more edge case: a regex can be followed by a lot more operators or |
||
| 285 | // keywords if there's a newline (ASI) in between, where the operator |
||
| 286 | // actually starts a new statement |
||
| 287 | // (https://github.com/matthiasmullie/minify/issues/56) |
||
| 288 | $operators = $this->getOperatorsForRegex($this->operatorsBefore, '/'); |
||
| 289 | $operators += $this->getOperatorsForRegex($this->keywordsReserved, '/'); |
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| 1042 | daniel-mar | 290 | $after = '(?=\s*\n\s*(' . implode('|', $operators) . '))'; |
| 291 | $this->registerPattern('/' . $pattern . $after . '/', $callback); |
||
| 597 | daniel-mar | 292 | } |
| 293 | |||
| 294 | /** |
||
| 295 | * Strip whitespace. |
||
| 296 | * |
||
| 297 | * We won't strip *all* whitespace, but as much as possible. The thing that |
||
| 298 | * we'll preserve are newlines we're unsure about. |
||
| 299 | * JavaScript doesn't require statements to be terminated with a semicolon. |
||
| 300 | * It will automatically fix missing semicolons with ASI (automatic semi- |
||
| 301 | * colon insertion) at the end of line causing errors (without semicolon.) |
||
| 302 | * |
||
| 303 | * Because it's sometimes hard to tell if a newline is part of a statement |
||
| 304 | * that should be terminated or not, we'll just leave some of them alone. |
||
| 305 | * |
||
| 306 | * @param string $content The content to strip the whitespace for |
||
| 307 | * |
||
| 308 | * @return string |
||
| 309 | */ |
||
| 310 | protected function stripWhitespace($content) |
||
| 311 | { |
||
| 312 | // uniform line endings, make them all line feed |
||
| 313 | $content = str_replace(array("\r\n", "\r"), "\n", $content); |
||
| 314 | |||
| 315 | // collapse all non-line feed whitespace into a single space |
||
| 316 | $content = preg_replace('/[^\S\n]+/', ' ', $content); |
||
| 317 | |||
| 318 | // strip leading & trailing whitespace |
||
| 319 | $content = str_replace(array(" \n", "\n "), "\n", $content); |
||
| 320 | |||
| 321 | // collapse consecutive line feeds into just 1 |
||
| 322 | $content = preg_replace('/\n+/', "\n", $content); |
||
| 323 | |||
| 324 | $operatorsBefore = $this->getOperatorsForRegex($this->operatorsBefore, '/'); |
||
| 325 | $operatorsAfter = $this->getOperatorsForRegex($this->operatorsAfter, '/'); |
||
| 326 | $operators = $this->getOperatorsForRegex($this->operators, '/'); |
||
| 327 | $keywordsBefore = $this->getKeywordsForRegex($this->keywordsBefore, '/'); |
||
| 328 | $keywordsAfter = $this->getKeywordsForRegex($this->keywordsAfter, '/'); |
||
| 329 | |||
| 330 | // strip whitespace that ends in (or next line begin with) an operator |
||
| 331 | // that allows statements to be broken up over multiple lines |
||
| 332 | unset($operatorsBefore['+'], $operatorsBefore['-'], $operatorsAfter['+'], $operatorsAfter['-']); |
||
| 333 | $content = preg_replace( |
||
| 334 | array( |
||
| 1042 | daniel-mar | 335 | '/(' . implode('|', $operatorsBefore) . ')\s+/', |
| 336 | '/\s+(' . implode('|', $operatorsAfter) . ')/', |
||
| 597 | daniel-mar | 337 | ), |
| 338 | '\\1', |
||
| 339 | $content |
||
| 340 | ); |
||
| 341 | |||
| 342 | // make sure + and - can't be mistaken for, or joined into ++ and -- |
||
| 343 | $content = preg_replace( |
||
| 344 | array( |
||
| 345 | '/(?<![\+\-])\s*([\+\-])(?![\+\-])/', |
||
| 346 | '/(?<![\+\-])([\+\-])\s*(?![\+\-])/', |
||
| 347 | ), |
||
| 348 | '\\1', |
||
| 349 | $content |
||
| 350 | ); |
||
| 351 | |||
| 352 | // collapse whitespace around reserved words into single space |
||
| 1042 | daniel-mar | 353 | $content = preg_replace('/(^|[;\}\s])\K(' . implode('|', $keywordsBefore) . ')\s+/', '\\2 ', $content); |
| 354 | $content = preg_replace('/\s+(' . implode('|', $keywordsAfter) . ')(?=([;\{\s]|$))/', ' \\1', $content); |
||
| 597 | daniel-mar | 355 | |
| 356 | /* |
||
| 357 | * We didn't strip whitespace after a couple of operators because they |
||
| 358 | * could be used in different contexts and we can't be sure it's ok to |
||
| 359 | * strip the newlines. However, we can safely strip any non-line feed |
||
| 360 | * whitespace that follows them. |
||
| 361 | */ |
||
| 362 | $operatorsDiffBefore = array_diff($operators, $operatorsBefore); |
||
| 363 | $operatorsDiffAfter = array_diff($operators, $operatorsAfter); |
||
| 1042 | daniel-mar | 364 | $content = preg_replace('/(' . implode('|', $operatorsDiffBefore) . ')[^\S\n]+/', '\\1', $content); |
| 365 | $content = preg_replace('/[^\S\n]+(' . implode('|', $operatorsDiffAfter) . ')/', '\\1', $content); |
||
| 597 | daniel-mar | 366 | |
| 367 | /* |
||
| 368 | * Whitespace after `return` can be omitted in a few occasions |
||
| 369 | * (such as when followed by a string or regex) |
||
| 370 | * Same for whitespace in between `)` and `{`, or between `{` and some |
||
| 371 | * keywords. |
||
| 372 | */ |
||
| 373 | $content = preg_replace('/\breturn\s+(["\'\/\+\-])/', 'return$1', $content); |
||
| 374 | $content = preg_replace('/\)\s+\{/', '){', $content); |
||
| 375 | $content = preg_replace('/}\n(else|catch|finally)\b/', '}$1', $content); |
||
| 376 | |||
| 377 | /* |
||
| 378 | * Get rid of double semicolons, except where they can be used like: |
||
| 379 | * "for(v=1,_=b;;)", "for(v=1;;v++)" or "for(;;ja||(ja=true))". |
||
| 380 | * I'll safeguard these double semicolons inside for-loops by |
||
| 381 | * temporarily replacing them with an invalid condition: they won't have |
||
| 382 | * a double semicolon and will be easy to spot to restore afterwards. |
||
| 383 | */ |
||
| 384 | $content = preg_replace('/\bfor\(([^;]*);;([^;]*)\)/', 'for(\\1;-;\\2)', $content); |
||
| 385 | $content = preg_replace('/;+/', ';', $content); |
||
| 386 | $content = preg_replace('/\bfor\(([^;]*);-;([^;]*)\)/', 'for(\\1;;\\2)', $content); |
||
| 387 | |||
| 388 | /* |
||
| 389 | * Next, we'll be removing all semicolons where ASI kicks in. |
||
| 390 | * for-loops however, can have an empty body (ending in only a |
||
| 391 | * semicolon), like: `for(i=1;i<3;i++);`, of `for(i in list);` |
||
| 392 | * Here, nothing happens during the loop; it's just used to keep |
||
| 393 | * increasing `i`. With that ; omitted, the next line would be expected |
||
| 394 | * to be the for-loop's body... Same goes for while loops. |
||
| 395 | * I'm going to double that semicolon (if any) so after the next line, |
||
| 396 | * which strips semicolons here & there, we're still left with this one. |
||
| 842 | daniel-mar | 397 | * Note the special recursive construct in the three inner parts of the for: |
| 398 | * (\{([^\{\}]*(?-2))*[^\{\}]*\})? - it is intended to match inline |
||
| 399 | * functions bodies, e.g.: i<arr.map(function(e){return e}).length. |
||
| 400 | * Also note that the construct is applied only once and multiplied |
||
| 401 | * for each part of the for, otherwise it risks a catastrophic backtracking. |
||
| 402 | * The limitation is that it will not allow closures in more than one |
||
| 403 | * of the three parts for a specific for() case. |
||
| 404 | * REGEX throwing catastrophic backtracking: $content = preg_replace('/(for\([^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*;[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*;[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*\));(\}|$)/s', '\\1;;\\8', $content); |
||
| 597 | daniel-mar | 405 | */ |
| 846 | daniel-mar | 406 | $content = preg_replace('/(for\((?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*);[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\4', $content); |
| 407 | $content = preg_replace('/(for\([^;\{]*;(?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*);[^;\{]*\));(\}|$)/s', '\\1;;\\4', $content); |
||
| 408 | $content = preg_replace('/(for\([^;\{]*;[^;\{]*;(?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*)\));(\}|$)/s', '\\1;;\\4', $content); |
||
| 842 | daniel-mar | 409 | |
| 597 | daniel-mar | 410 | $content = preg_replace('/(for\([^;\{]+\s+in\s+[^;\{]+\));(\}|$)/s', '\\1;;\\2', $content); |
| 846 | daniel-mar | 411 | |
| 597 | daniel-mar | 412 | /* |
| 846 | daniel-mar | 413 | * Do the same for the if's that don't have a body but are followed by ;} |
| 414 | */ |
||
| 415 | $content = preg_replace('/(\bif\s*\([^{;]*\));\}/s', '\\1;;}', $content); |
||
| 416 | |||
| 417 | /* |
||
| 597 | daniel-mar | 418 | * Below will also keep `;` after a `do{}while();` along with `while();` |
| 419 | * While these could be stripped after do-while, detecting this |
||
| 420 | * distinction is cumbersome, so I'll play it safe and make sure `;` |
||
| 421 | * after any kind of `while` is kept. |
||
| 422 | */ |
||
| 423 | $content = preg_replace('/(while\([^;\{]+\));(\}|$)/s', '\\1;;\\2', $content); |
||
| 424 | |||
| 425 | /* |
||
| 426 | * We also can't strip empty else-statements. Even though they're |
||
| 427 | * useless and probably shouldn't be in the code in the first place, we |
||
| 428 | * shouldn't be stripping the `;` that follows it as it breaks the code. |
||
| 429 | * We can just remove those useless else-statements completely. |
||
| 430 | * |
||
| 431 | * @see https://github.com/matthiasmullie/minify/issues/91 |
||
| 432 | */ |
||
| 433 | $content = preg_replace('/else;/s', '', $content); |
||
| 434 | |||
| 435 | /* |
||
| 436 | * We also don't really want to terminate statements followed by closing |
||
| 437 | * curly braces (which we've ignored completely up until now) or end-of- |
||
| 438 | * script: ASI will kick in here & we're all about minifying. |
||
| 439 | * Semicolons at beginning of the file don't make any sense either. |
||
| 440 | */ |
||
| 441 | $content = preg_replace('/;(\}|$)/s', '\\1', $content); |
||
| 442 | $content = ltrim($content, ';'); |
||
| 443 | |||
| 444 | // get rid of remaining whitespace af beginning/end |
||
| 445 | return trim($content); |
||
| 446 | } |
||
| 447 | |||
| 448 | /** |
||
| 449 | * We'll strip whitespace around certain operators with regular expressions. |
||
| 450 | * This will prepare the given array by escaping all characters. |
||
| 451 | * |
||
| 452 | * @param string[] $operators |
||
| 453 | * @param string $delimiter |
||
| 454 | * |
||
| 455 | * @return string[] |
||
| 456 | */ |
||
| 457 | protected function getOperatorsForRegex(array $operators, $delimiter = '/') |
||
| 458 | { |
||
| 459 | // escape operators for use in regex |
||
| 460 | $delimiters = array_fill(0, count($operators), $delimiter); |
||
| 461 | $escaped = array_map('preg_quote', $operators, $delimiters); |
||
| 462 | |||
| 463 | $operators = array_combine($operators, $escaped); |
||
| 464 | |||
| 465 | // ignore + & - for now, they'll get special treatment |
||
| 466 | unset($operators['+'], $operators['-']); |
||
| 467 | |||
| 468 | // dot can not just immediately follow a number; it can be confused for |
||
| 469 | // decimal point, or calling a method on it, e.g. 42 .toString() |
||
| 470 | $operators['.'] = '(?<![0-9]\s)\.'; |
||
| 471 | |||
| 472 | // don't confuse = with other assignment shortcuts (e.g. +=) |
||
| 473 | $chars = preg_quote('+-*\=<>%&|', $delimiter); |
||
| 1042 | daniel-mar | 474 | $operators['='] = '(?<![' . $chars . '])\='; |
| 597 | daniel-mar | 475 | |
| 476 | return $operators; |
||
| 477 | } |
||
| 478 | |||
| 479 | /** |
||
| 480 | * We'll strip whitespace around certain keywords with regular expressions. |
||
| 481 | * This will prepare the given array by escaping all characters. |
||
| 482 | * |
||
| 483 | * @param string[] $keywords |
||
| 484 | * @param string $delimiter |
||
| 485 | * |
||
| 486 | * @return string[] |
||
| 487 | */ |
||
| 488 | protected function getKeywordsForRegex(array $keywords, $delimiter = '/') |
||
| 489 | { |
||
| 490 | // escape keywords for use in regex |
||
| 491 | $delimiter = array_fill(0, count($keywords), $delimiter); |
||
| 492 | $escaped = array_map('preg_quote', $keywords, $delimiter); |
||
| 493 | |||
| 494 | // add word boundaries |
||
| 495 | array_walk($keywords, function ($value) { |
||
| 1042 | daniel-mar | 496 | return '\b' . $value . '\b'; |
| 597 | daniel-mar | 497 | }); |
| 498 | |||
| 499 | $keywords = array_combine($keywords, $escaped); |
||
| 500 | |||
| 501 | return $keywords; |
||
| 502 | } |
||
| 503 | |||
| 504 | /** |
||
| 505 | * Replaces all occurrences of array['key'] by array.key. |
||
| 506 | * |
||
| 507 | * @param string $content |
||
| 508 | * |
||
| 509 | * @return string |
||
| 510 | */ |
||
| 511 | protected function propertyNotation($content) |
||
| 512 | { |
||
| 513 | // PHP only supports $this inside anonymous functions since 5.4 |
||
| 514 | $minifier = $this; |
||
| 515 | $keywords = $this->keywordsReserved; |
||
| 516 | $callback = function ($match) use ($minifier, $keywords) { |
||
| 517 | $property = trim($minifier->extracted[$match[1]], '\'"'); |
||
| 518 | |||
| 519 | /* |
||
| 520 | * Check if the property is a reserved keyword. In this context (as |
||
| 521 | * property of an object literal/array) it shouldn't matter, but IE8 |
||
| 522 | * freaks out with "Expected identifier". |
||
| 523 | */ |
||
| 524 | if (in_array($property, $keywords)) { |
||
| 525 | return $match[0]; |
||
| 526 | } |
||
| 527 | |||
| 528 | /* |
||
| 529 | * See if the property is in a variable-like format (e.g. |
||
| 530 | * array['key-here'] can't be replaced by array.key-here since '-' |
||
| 531 | * is not a valid character there. |
||
| 532 | */ |
||
| 1042 | daniel-mar | 533 | if (!preg_match('/^' . $minifier::REGEX_VARIABLE . '$/u', $property)) { |
| 597 | daniel-mar | 534 | return $match[0]; |
| 535 | } |
||
| 536 | |||
| 1042 | daniel-mar | 537 | return '.' . $property; |
| 597 | daniel-mar | 538 | }; |
| 539 | |||
| 540 | /* |
||
| 541 | * Figure out if previous character is a variable name (of the array |
||
| 542 | * we want to use property notation on) - this is to make sure |
||
| 543 | * standalone ['value'] arrays aren't confused for keys-of-an-array. |
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| 544 | * We can (and only have to) check the last character, because PHP's |
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| 545 | * regex implementation doesn't allow unfixed-length look-behind |
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| 546 | * assertions. |
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| 547 | */ |
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| 548 | preg_match('/(\[[^\]]+\])[^\]]*$/', static::REGEX_VARIABLE, $previousChar); |
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| 549 | $previousChar = $previousChar[1]; |
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| 550 | |||
| 551 | /* |
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| 552 | * Make sure word preceding the ['value'] is not a keyword, e.g. |
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| 553 | * return['x']. Because -again- PHP's regex implementation doesn't allow |
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| 554 | * unfixed-length look-behind assertions, I'm just going to do a lot of |
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| 555 | * separate look-behind assertions, one for each keyword. |
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| 556 | */ |
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| 557 | $keywords = $this->getKeywordsForRegex($keywords); |
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| 1042 | daniel-mar | 558 | $keywords = '(?<!' . implode(')(?<!', $keywords) . ')'; |
| 597 | daniel-mar | 559 | |
| 1042 | daniel-mar | 560 | return preg_replace_callback('/(?<=' . $previousChar . '|\])' . $keywords . '\[\s*(([\'"])[0-9]+\\2)\s*\]/u', $callback, $content); |
| 597 | daniel-mar | 561 | } |
| 562 | |||
| 563 | /** |
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| 564 | * Replaces true & false by !0 and !1. |
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| 565 | * |
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| 566 | * @param string $content |
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| 567 | * |
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| 568 | * @return string |
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| 569 | */ |
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| 570 | protected function shortenBools($content) |
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| 571 | { |
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| 572 | /* |
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| 573 | * 'true' or 'false' could be used as property names (which may be |
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| 574 | * followed by whitespace) - we must not replace those! |
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| 575 | * Since PHP doesn't allow variable-length (to account for the |
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| 576 | * whitespace) lookbehind assertions, I need to capture the leading |
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| 577 | * character and check if it's a `.` |
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| 578 | */ |
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| 579 | $callback = function ($match) { |
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| 580 | if (trim($match[1]) === '.') { |
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| 581 | return $match[0]; |
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| 582 | } |
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| 583 | |||
| 1042 | daniel-mar | 584 | return $match[1] . ($match[2] === 'true' ? '!0' : '!1'); |
| 597 | daniel-mar | 585 | }; |
| 586 | $content = preg_replace_callback('/(^|.\s*)\b(true|false)\b(?!:)/', $callback, $content); |
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| 587 | |||
| 588 | // for(;;) is exactly the same as while(true), but shorter :) |
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| 589 | $content = preg_replace('/\bwhile\(!0\){/', 'for(;;){', $content); |
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| 590 | |||
| 591 | // now make sure we didn't turn any do ... while(true) into do ... for(;;) |
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| 592 | preg_match_all('/\bdo\b/', $content, $dos, PREG_OFFSET_CAPTURE | PREG_SET_ORDER); |
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| 593 | |||
| 594 | // go backward to make sure positional offsets aren't altered when $content changes |
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| 595 | $dos = array_reverse($dos); |
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| 596 | foreach ($dos as $do) { |
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| 597 | $offsetDo = $do[0][1]; |
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| 598 | |||
| 599 | // find all `while` (now `for`) following `do`: one of those must be |
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| 600 | // associated with the `do` and be turned back into `while` |
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| 601 | preg_match_all('/\bfor\(;;\)/', $content, $whiles, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offsetDo); |
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| 602 | foreach ($whiles as $while) { |
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| 603 | $offsetWhile = $while[0][1]; |
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| 604 | |||
| 605 | $open = substr_count($content, '{', $offsetDo, $offsetWhile - $offsetDo); |
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| 606 | $close = substr_count($content, '}', $offsetDo, $offsetWhile - $offsetDo); |
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| 607 | if ($open === $close) { |
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| 608 | // only restore `while` if amount of `{` and `}` are the same; |
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| 609 | // otherwise, that `for` isn't associated with this `do` |
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| 610 | $content = substr_replace($content, 'while(!0)', $offsetWhile, strlen('for(;;)')); |
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| 611 | break; |
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| 612 | } |
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| 613 | } |
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| 614 | } |
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| 615 | |||
| 616 | return $content; |
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| 617 | } |
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| 618 | } |