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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 <minify@mullie.eu>
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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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* @author Matthias Mullie <minify@mullie.eu>
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* @author Tijs Verkoyen <minify@verkoyen.eu>
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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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* @internal
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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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38 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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125 |
/**
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|
126 |
* {@inheritdoc}
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127 |
*/
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128 |
public function __construct()
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|
129 |
{
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|
130 |
call_user_func_array(array('\\MatthiasMullie\Minify\\Minify', '__construct'), func_get_args());
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131 |
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132 |
$dataDir = __DIR__ . '/../data/js/';
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133 |
$options = FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES;
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134 |
$this->keywordsReserved = file($dataDir . 'keywords_reserved.txt', $options);
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135 |
$this->keywordsBefore = file($dataDir . 'keywords_before.txt', $options);
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136 |
$this->keywordsAfter = file($dataDir . 'keywords_after.txt', $options);
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137 |
$this->operators = file($dataDir . 'operators.txt', $options);
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|
138 |
$this->operatorsBefore = file($dataDir . 'operators_before.txt', $options);
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|
139 |
$this->operatorsAfter = file($dataDir . 'operators_after.txt', $options);
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140 |
}
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141 |
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142 |
/**
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|
143 |
* Minify the data.
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|
144 |
* Perform JS optimizations.
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|
145 |
*
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|
146 |
* @param string[optional] $path Path to write the data to
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|
147 |
*
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|
148 |
* @return string The minified data
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|
149 |
*/
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|
150 |
public function execute($path = null)
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|
151 |
{
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|
152 |
$content = '';
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|
153 |
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|
154 |
/*
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|
155 |
* Let's first take out strings, comments and regular expressions.
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|
156 |
* All of these can contain JS code-like characters, and we should make
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|
157 |
* sure any further magic ignores anything inside of these.
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158 |
*
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|
159 |
* Consider this example, where we should not strip any whitespace:
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|
160 |
* var str = "a test";
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|
161 |
*
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|
162 |
* Comments will be removed altogether, strings and regular expressions
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|
163 |
* will be replaced by placeholder text, which we'll restore later.
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|
164 |
*/
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|
165 |
$this->extractStrings('\'"`');
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|
166 |
$this->stripComments();
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|
167 |
$this->extractRegex();
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168 |
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|
169 |
// loop files
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|
170 |
foreach ($this->data as $source => $js) {
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171 |
// take out strings, comments & regex (for which we've registered
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|
172 |
// the regexes just a few lines earlier)
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|
173 |
$js = $this->replace($js);
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|
174 |
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|
175 |
$js = $this->propertyNotation($js);
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|
176 |
$js = $this->shortenBools($js);
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|
177 |
$js = $this->stripWhitespace($js);
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178 |
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|
179 |
// combine js: separating the scripts by a ;
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|
180 |
$content .= $js . ';';
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|
181 |
}
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|
182 |
|
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|
183 |
// clean up leftover `;`s from the combination of multiple scripts
|
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|
184 |
$content = ltrim($content, ';');
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|
185 |
$content = (string) substr($content, 0, -1);
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|
186 |
|
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|
187 |
/*
|
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|
188 |
* Earlier, we extracted strings & regular expressions and replaced them
|
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|
189 |
* with placeholder text. This will restore them.
|
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|
190 |
*/
|
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|
191 |
$content = $this->restoreExtractedData($content);
|
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|
192 |
|
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|
193 |
return $content;
|
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|
194 |
}
|
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|
195 |
|
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|
196 |
/**
|
|
|
197 |
* Strip comments from source code.
|
|
|
198 |
*/
|
|
|
199 |
protected function stripComments()
|
|
|
200 |
{
|
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|
201 |
$this->stripMultilineComments();
|
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|
202 |
|
|
|
203 |
// single-line comments
|
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|
204 |
$this->registerPattern('/\/\/.*$/m', '');
|
|
|
205 |
}
|
|
|
206 |
|
|
|
207 |
/**
|
|
|
208 |
* JS can have /-delimited regular expressions, like: /ab+c/.match(string).
|
|
|
209 |
*
|
|
|
210 |
* The content inside the regex can contain characters that may be confused
|
|
|
211 |
* for JS code: e.g. it could contain whitespace it needs to match & we
|
|
|
212 |
* don't want to strip whitespace in there.
|
|
|
213 |
*
|
|
|
214 |
* The regex can be pretty simple: we don't have to care about comments,
|
|
|
215 |
* (which also use slashes) because stripComments() will have stripped those
|
|
|
216 |
* already.
|
|
|
217 |
*
|
|
|
218 |
* This method will replace all string content with simple REGEX#
|
|
|
219 |
* placeholder text, so we've rid all regular expressions from characters
|
|
|
220 |
* that may be misinterpreted. Original regex content will be saved in
|
|
|
221 |
* $this->extracted and after doing all other minifying, we can restore the
|
|
|
222 |
* original content via restoreRegex()
|
|
|
223 |
*/
|
|
|
224 |
protected function extractRegex()
|
|
|
225 |
{
|
|
|
226 |
// PHP only supports $this inside anonymous functions since 5.4
|
|
|
227 |
$minifier = $this;
|
|
|
228 |
$callback = function ($match) use ($minifier) {
|
|
|
229 |
$count = count($minifier->extracted);
|
|
|
230 |
$placeholder = '"' . $count . '"';
|
|
|
231 |
$minifier->extracted[$placeholder] = $match[0];
|
|
|
232 |
|
|
|
233 |
return $placeholder;
|
|
|
234 |
};
|
|
|
235 |
|
|
|
236 |
// match all chars except `/` and `\`
|
|
|
237 |
// `\` is allowed though, along with whatever char follows (which is the
|
|
|
238 |
// one being escaped)
|
|
|
239 |
// this should allow all chars, except for an unescaped `/` (= the one
|
|
|
240 |
// closing the regex)
|
|
|
241 |
// then also ignore bare `/` inside `[]`, where they don't need to be
|
|
|
242 |
// escaped: anything inside `[]` can be ignored safely
|
|
|
243 |
$pattern = '\\/(?!\*)(?:[^\\[\\/\\\\\n\r]++|(?:\\\\.)++|(?:\\[(?:[^\\]\\\\\n\r]++|(?:\\\\.)++)++\\])++)++\\/[gimuy]*';
|
|
|
244 |
|
|
|
245 |
// a regular expression can only be followed by a few operators or some
|
|
|
246 |
// of the RegExp methods (a `\` followed by a variable or value is
|
|
|
247 |
// likely part of a division, not a regex)
|
|
|
248 |
$keywords = array('do', 'in', 'new', 'else', 'throw', 'yield', 'delete', 'return', 'typeof');
|
|
|
249 |
$before = '(^|[=:,;\+\-\*\?\/\}\(\{\[&\|!]|' . implode('|', $keywords) . ')\s*';
|
|
|
250 |
$propertiesAndMethods = array(
|
|
|
251 |
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties_2
|
|
|
252 |
'constructor',
|
|
|
253 |
'flags',
|
|
|
254 |
'global',
|
|
|
255 |
'ignoreCase',
|
|
|
256 |
'multiline',
|
|
|
257 |
'source',
|
|
|
258 |
'sticky',
|
|
|
259 |
'unicode',
|
|
|
260 |
// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2
|
|
|
261 |
'compile(',
|
|
|
262 |
'exec(',
|
|
|
263 |
'test(',
|
|
|
264 |
'toSource(',
|
|
|
265 |
'toString(',
|
|
|
266 |
);
|
|
|
267 |
$delimiters = array_fill(0, count($propertiesAndMethods), '/');
|
|
|
268 |
$propertiesAndMethods = array_map('preg_quote', $propertiesAndMethods, $delimiters);
|
|
|
269 |
$after = '(?=\s*([\.,;:\)\}&\|+]|\/\/|$|\.(' . implode('|', $propertiesAndMethods) . ')))';
|
|
|
270 |
$this->registerPattern('/' . $before . '\K' . $pattern . $after . '/', $callback);
|
|
|
271 |
|
|
|
272 |
// regular expressions following a `)` are rather annoying to detect...
|
|
|
273 |
// quite often, `/` after `)` is a division operator & if it happens to
|
|
|
274 |
// be followed by another one (or a comment), it is likely to be
|
|
|
275 |
// confused for a regular expression
|
|
|
276 |
// however, it's perfectly possible for a regex to follow a `)`: after
|
|
|
277 |
// a single-line `if()`, `while()`, ... statement, for example
|
|
|
278 |
// since, when they occur like that, they're always the start of a
|
|
|
279 |
// statement, there's only a limited amount of ways they can be useful:
|
|
|
280 |
// by calling the regex methods directly
|
|
|
281 |
// if a regex following `)` is not followed by `.<property or method>`,
|
|
|
282 |
// it's quite likely not a regex
|
|
|
283 |
$before = '\)\s*';
|
|
|
284 |
$after = '(?=\s*\.(' . implode('|', $propertiesAndMethods) . '))';
|
|
|
285 |
$this->registerPattern('/' . $before . '\K' . $pattern . $after . '/', $callback);
|
|
|
286 |
|
|
|
287 |
// 1 more edge case: a regex can be followed by a lot more operators or
|
|
|
288 |
// keywords if there's a newline (ASI) in between, where the operator
|
|
|
289 |
// actually starts a new statement
|
|
|
290 |
// (https://github.com/matthiasmullie/minify/issues/56)
|
|
|
291 |
$operators = $this->getOperatorsForRegex($this->operatorsBefore, '/');
|
|
|
292 |
$operators += $this->getOperatorsForRegex($this->keywordsReserved, '/');
|
|
|
293 |
$after = '(?=\s*\n\s*(' . implode('|', $operators) . '))';
|
|
|
294 |
$this->registerPattern('/' . $pattern . $after . '/', $callback);
|
|
|
295 |
}
|
|
|
296 |
|
|
|
297 |
/**
|
|
|
298 |
* Strip whitespace.
|
|
|
299 |
*
|
|
|
300 |
* We won't strip *all* whitespace, but as much as possible. The thing that
|
|
|
301 |
* we'll preserve are newlines we're unsure about.
|
|
|
302 |
* JavaScript doesn't require statements to be terminated with a semicolon.
|
|
|
303 |
* It will automatically fix missing semicolons with ASI (automatic semi-
|
|
|
304 |
* colon insertion) at the end of line causing errors (without semicolon.)
|
|
|
305 |
*
|
|
|
306 |
* Because it's sometimes hard to tell if a newline is part of a statement
|
|
|
307 |
* that should be terminated or not, we'll just leave some of them alone.
|
|
|
308 |
*
|
|
|
309 |
* @param string $content The content to strip the whitespace for
|
|
|
310 |
*
|
|
|
311 |
* @return string
|
|
|
312 |
*/
|
|
|
313 |
protected function stripWhitespace($content)
|
|
|
314 |
{
|
|
|
315 |
// uniform line endings, make them all line feed
|
|
|
316 |
$content = str_replace(array("\r\n", "\r"), "\n", $content);
|
|
|
317 |
|
|
|
318 |
// collapse all non-line feed whitespace into a single space
|
|
|
319 |
$content = preg_replace('/[^\S\n]+/', ' ', $content);
|
|
|
320 |
|
|
|
321 |
// strip leading & trailing whitespace
|
|
|
322 |
$content = str_replace(array(" \n", "\n "), "\n", $content);
|
|
|
323 |
|
|
|
324 |
// collapse consecutive line feeds into just 1
|
|
|
325 |
$content = preg_replace('/\n+/', "\n", $content);
|
|
|
326 |
|
|
|
327 |
$operatorsBefore = $this->getOperatorsForRegex($this->operatorsBefore, '/');
|
|
|
328 |
$operatorsAfter = $this->getOperatorsForRegex($this->operatorsAfter, '/');
|
|
|
329 |
$operators = $this->getOperatorsForRegex($this->operators, '/');
|
|
|
330 |
$keywordsBefore = $this->getKeywordsForRegex($this->keywordsBefore, '/');
|
|
|
331 |
$keywordsAfter = $this->getKeywordsForRegex($this->keywordsAfter, '/');
|
|
|
332 |
|
|
|
333 |
// strip whitespace that ends in (or next line begin with) an operator
|
|
|
334 |
// that allows statements to be broken up over multiple lines
|
|
|
335 |
unset($operatorsBefore['+'], $operatorsBefore['-'], $operatorsAfter['+'], $operatorsAfter['-']);
|
|
|
336 |
$content = preg_replace(
|
|
|
337 |
array(
|
|
|
338 |
'/(' . implode('|', $operatorsBefore) . ')\s+/',
|
|
|
339 |
'/\s+(' . implode('|', $operatorsAfter) . ')/',
|
|
|
340 |
),
|
|
|
341 |
'\\1',
|
|
|
342 |
$content
|
|
|
343 |
);
|
|
|
344 |
|
|
|
345 |
// make sure + and - can't be mistaken for, or joined into ++ and --
|
|
|
346 |
$content = preg_replace(
|
|
|
347 |
array(
|
|
|
348 |
'/(?<![\+\-])\s*([\+\-])(?![\+\-])/',
|
|
|
349 |
'/(?<![\+\-])([\+\-])\s*(?![\+\-])/',
|
|
|
350 |
),
|
|
|
351 |
'\\1',
|
|
|
352 |
$content
|
|
|
353 |
);
|
|
|
354 |
|
|
|
355 |
// collapse whitespace around reserved words into single space
|
|
|
356 |
$content = preg_replace('/(^|[;\}\s])\K(' . implode('|', $keywordsBefore) . ')\s+/', '\\2 ', $content);
|
|
|
357 |
$content = preg_replace('/\s+(' . implode('|', $keywordsAfter) . ')(?=([;\{\s]|$))/', ' \\1', $content);
|
|
|
358 |
|
|
|
359 |
/*
|
|
|
360 |
* We didn't strip whitespace after a couple of operators because they
|
|
|
361 |
* could be used in different contexts and we can't be sure it's ok to
|
|
|
362 |
* strip the newlines. However, we can safely strip any non-line feed
|
|
|
363 |
* whitespace that follows them.
|
|
|
364 |
*/
|
|
|
365 |
$operatorsDiffBefore = array_diff($operators, $operatorsBefore);
|
|
|
366 |
$operatorsDiffAfter = array_diff($operators, $operatorsAfter);
|
|
|
367 |
$content = preg_replace('/(' . implode('|', $operatorsDiffBefore) . ')[^\S\n]+/', '\\1', $content);
|
|
|
368 |
$content = preg_replace('/[^\S\n]+(' . implode('|', $operatorsDiffAfter) . ')/', '\\1', $content);
|
|
|
369 |
|
|
|
370 |
/*
|
|
|
371 |
* Whitespace after `return` can be omitted in a few occasions
|
|
|
372 |
* (such as when followed by a string or regex)
|
|
|
373 |
* Same for whitespace in between `)` and `{`, or between `{` and some
|
|
|
374 |
* keywords.
|
|
|
375 |
*/
|
|
|
376 |
$content = preg_replace('/\breturn\s+(["\'\/\+\-])/', 'return$1', $content);
|
|
|
377 |
$content = preg_replace('/\)\s+\{/', '){', $content);
|
|
|
378 |
$content = preg_replace('/}\n(else|catch|finally)\b/', '}$1', $content);
|
|
|
379 |
|
|
|
380 |
/*
|
|
|
381 |
* Get rid of double semicolons, except where they can be used like:
|
|
|
382 |
* "for(v=1,_=b;;)", "for(v=1;;v++)" or "for(;;ja||(ja=true))".
|
|
|
383 |
* I'll safeguard these double semicolons inside for-loops by
|
|
|
384 |
* temporarily replacing them with an invalid condition: they won't have
|
|
|
385 |
* a double semicolon and will be easy to spot to restore afterwards.
|
|
|
386 |
*/
|
|
|
387 |
$content = preg_replace('/\bfor\(([^;]*);;([^;]*)\)/', 'for(\\1;-;\\2)', $content);
|
|
|
388 |
$content = preg_replace('/;+/', ';', $content);
|
|
|
389 |
$content = preg_replace('/\bfor\(([^;]*);-;([^;]*)\)/', 'for(\\1;;\\2)', $content);
|
|
|
390 |
|
|
|
391 |
/*
|
|
|
392 |
* Next, we'll be removing all semicolons where ASI kicks in.
|
|
|
393 |
* for-loops however, can have an empty body (ending in only a
|
|
|
394 |
* semicolon), like: `for(i=1;i<3;i++);`, of `for(i in list);`
|
|
|
395 |
* Here, nothing happens during the loop; it's just used to keep
|
|
|
396 |
* increasing `i`. With that ; omitted, the next line would be expected
|
|
|
397 |
* to be the for-loop's body... Same goes for while loops.
|
|
|
398 |
* I'm going to double that semicolon (if any) so after the next line,
|
|
|
399 |
* which strips semicolons here & there, we're still left with this one.
|
|
|
400 |
* Note the special recursive construct in the three inner parts of the for:
|
|
|
401 |
* (\{([^\{\}]*(?-2))*[^\{\}]*\})? - it is intended to match inline
|
|
|
402 |
* functions bodies, e.g.: i<arr.map(function(e){return e}).length.
|
|
|
403 |
* Also note that the construct is applied only once and multiplied
|
|
|
404 |
* for each part of the for, otherwise it risks a catastrophic backtracking.
|
|
|
405 |
* The limitation is that it will not allow closures in more than one
|
|
|
406 |
* of the three parts for a specific for() case.
|
|
|
407 |
* REGEX throwing catastrophic backtracking: $content = preg_replace('/(for\([^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*;[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*;[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*\));(\}|$)/s', '\\1;;\\8', $content);
|
|
|
408 |
*/
|
|
|
409 |
$content = preg_replace('/(for\((?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*);[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\4', $content);
|
|
|
410 |
$content = preg_replace('/(for\([^;\{]*;(?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*);[^;\{]*\));(\}|$)/s', '\\1;;\\4', $content);
|
|
|
411 |
$content = preg_replace('/(for\([^;\{]*;[^;\{]*;(?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*)\));(\}|$)/s', '\\1;;\\4', $content);
|
|
|
412 |
|
|
|
413 |
$content = preg_replace('/(for\([^;\{]+\s+in\s+[^;\{]+\));(\}|$)/s', '\\1;;\\2', $content);
|
|
|
414 |
|
|
|
415 |
/*
|
|
|
416 |
* Do the same for the if's that don't have a body but are followed by ;}
|
|
|
417 |
*/
|
|
|
418 |
$content = preg_replace('/(\bif\s*\([^{;]*\));\}/s', '\\1;;}', $content);
|
|
|
419 |
|
|
|
420 |
/*
|
|
|
421 |
* Below will also keep `;` after a `do{}while();` along with `while();`
|
|
|
422 |
* While these could be stripped after do-while, detecting this
|
|
|
423 |
* distinction is cumbersome, so I'll play it safe and make sure `;`
|
|
|
424 |
* after any kind of `while` is kept.
|
|
|
425 |
*/
|
|
|
426 |
$content = preg_replace('/(while\([^;\{]+\));(\}|$)/s', '\\1;;\\2', $content);
|
|
|
427 |
|
|
|
428 |
/*
|
|
|
429 |
* We also can't strip empty else-statements. Even though they're
|
|
|
430 |
* useless and probably shouldn't be in the code in the first place, we
|
|
|
431 |
* shouldn't be stripping the `;` that follows it as it breaks the code.
|
|
|
432 |
* We can just remove those useless else-statements completely.
|
|
|
433 |
*
|
|
|
434 |
* @see https://github.com/matthiasmullie/minify/issues/91
|
|
|
435 |
*/
|
|
|
436 |
$content = preg_replace('/else;/s', '', $content);
|
|
|
437 |
|
|
|
438 |
/*
|
|
|
439 |
* We also don't really want to terminate statements followed by closing
|
|
|
440 |
* curly braces (which we've ignored completely up until now) or end-of-
|
|
|
441 |
* script: ASI will kick in here & we're all about minifying.
|
|
|
442 |
* Semicolons at beginning of the file don't make any sense either.
|
|
|
443 |
*/
|
|
|
444 |
$content = preg_replace('/;(\}|$)/s', '\\1', $content);
|
|
|
445 |
$content = ltrim($content, ';');
|
|
|
446 |
|
|
|
447 |
// get rid of remaining whitespace af beginning/end
|
|
|
448 |
return trim($content);
|
|
|
449 |
}
|
|
|
450 |
|
|
|
451 |
/**
|
|
|
452 |
* We'll strip whitespace around certain operators with regular expressions.
|
|
|
453 |
* This will prepare the given array by escaping all characters.
|
|
|
454 |
*
|
|
|
455 |
* @param string[] $operators
|
|
|
456 |
* @param string $delimiter
|
|
|
457 |
*
|
|
|
458 |
* @return string[]
|
|
|
459 |
*/
|
|
|
460 |
protected function getOperatorsForRegex(array $operators, $delimiter = '/')
|
|
|
461 |
{
|
|
|
462 |
// escape operators for use in regex
|
|
|
463 |
$delimiters = array_fill(0, count($operators), $delimiter);
|
|
|
464 |
$escaped = array_map('preg_quote', $operators, $delimiters);
|
|
|
465 |
|
|
|
466 |
$operators = array_combine($operators, $escaped);
|
|
|
467 |
|
|
|
468 |
// ignore + & - for now, they'll get special treatment
|
|
|
469 |
unset($operators['+'], $operators['-']);
|
|
|
470 |
|
|
|
471 |
// dot can not just immediately follow a number; it can be confused for
|
|
|
472 |
// decimal point, or calling a method on it, e.g. 42 .toString()
|
|
|
473 |
$operators['.'] = '(?<![0-9]\s)\.';
|
|
|
474 |
|
|
|
475 |
// don't confuse = with other assignment shortcuts (e.g. +=)
|
|
|
476 |
$chars = preg_quote('+-*\=<>%&|', $delimiter);
|
|
|
477 |
$operators['='] = '(?<![' . $chars . '])\=';
|
|
|
478 |
|
|
|
479 |
return $operators;
|
|
|
480 |
}
|
|
|
481 |
|
|
|
482 |
/**
|
|
|
483 |
* We'll strip whitespace around certain keywords with regular expressions.
|
|
|
484 |
* This will prepare the given array by escaping all characters.
|
|
|
485 |
*
|
|
|
486 |
* @param string[] $keywords
|
|
|
487 |
* @param string $delimiter
|
|
|
488 |
*
|
|
|
489 |
* @return string[]
|
|
|
490 |
*/
|
|
|
491 |
protected function getKeywordsForRegex(array $keywords, $delimiter = '/')
|
|
|
492 |
{
|
|
|
493 |
// escape keywords for use in regex
|
|
|
494 |
$delimiter = array_fill(0, count($keywords), $delimiter);
|
|
|
495 |
$escaped = array_map('preg_quote', $keywords, $delimiter);
|
|
|
496 |
|
|
|
497 |
// add word boundaries
|
|
|
498 |
array_walk($keywords, function ($value) {
|
|
|
499 |
return '\b' . $value . '\b';
|
|
|
500 |
});
|
|
|
501 |
|
|
|
502 |
$keywords = array_combine($keywords, $escaped);
|
|
|
503 |
|
|
|
504 |
return $keywords;
|
|
|
505 |
}
|
|
|
506 |
|
|
|
507 |
/**
|
|
|
508 |
* Replaces all occurrences of array['key'] by array.key.
|
|
|
509 |
*
|
|
|
510 |
* @param string $content
|
|
|
511 |
*
|
|
|
512 |
* @return string
|
|
|
513 |
*/
|
|
|
514 |
protected function propertyNotation($content)
|
|
|
515 |
{
|
|
|
516 |
// PHP only supports $this inside anonymous functions since 5.4
|
|
|
517 |
$minifier = $this;
|
|
|
518 |
$keywords = $this->keywordsReserved;
|
|
|
519 |
$callback = function ($match) use ($minifier, $keywords) {
|
|
|
520 |
$property = trim($minifier->extracted[$match[1]], '\'"');
|
|
|
521 |
|
|
|
522 |
/*
|
|
|
523 |
* Check if the property is a reserved keyword. In this context (as
|
|
|
524 |
* property of an object literal/array) it shouldn't matter, but IE8
|
|
|
525 |
* freaks out with "Expected identifier".
|
|
|
526 |
*/
|
|
|
527 |
if (in_array($property, $keywords)) {
|
|
|
528 |
return $match[0];
|
|
|
529 |
}
|
|
|
530 |
|
|
|
531 |
/*
|
|
|
532 |
* See if the property is in a variable-like format (e.g.
|
|
|
533 |
* array['key-here'] can't be replaced by array.key-here since '-'
|
|
|
534 |
* is not a valid character there.
|
|
|
535 |
*/
|
|
|
536 |
if (!preg_match('/^' . $minifier::REGEX_VARIABLE . '$/u', $property)) {
|
|
|
537 |
return $match[0];
|
|
|
538 |
}
|
|
|
539 |
|
|
|
540 |
return '.' . $property;
|
|
|
541 |
};
|
|
|
542 |
|
|
|
543 |
/*
|
|
|
544 |
* Figure out if previous character is a variable name (of the array
|
|
|
545 |
* we want to use property notation on) - this is to make sure
|
|
|
546 |
* standalone ['value'] arrays aren't confused for keys-of-an-array.
|
|
|
547 |
* We can (and only have to) check the last character, because PHP's
|
|
|
548 |
* regex implementation doesn't allow unfixed-length look-behind
|
|
|
549 |
* assertions.
|
|
|
550 |
*/
|
|
|
551 |
preg_match('/(\[[^\]]+\])[^\]]*$/', static::REGEX_VARIABLE, $previousChar);
|
|
|
552 |
$previousChar = $previousChar[1];
|
|
|
553 |
|
|
|
554 |
/*
|
|
|
555 |
* Make sure word preceding the ['value'] is not a keyword, e.g.
|
|
|
556 |
* return['x']. Because -again- PHP's regex implementation doesn't allow
|
|
|
557 |
* unfixed-length look-behind assertions, I'm just going to do a lot of
|
|
|
558 |
* separate look-behind assertions, one for each keyword.
|
|
|
559 |
*/
|
|
|
560 |
$keywords = $this->getKeywordsForRegex($keywords);
|
|
|
561 |
$keywords = '(?<!' . implode(')(?<!', $keywords) . ')';
|
|
|
562 |
|
|
|
563 |
return preg_replace_callback('/(?<=' . $previousChar . '|\])' . $keywords . '\[\s*(([\'"])[0-9]+\\2)\s*\]/u', $callback, $content);
|
|
|
564 |
}
|
|
|
565 |
|
|
|
566 |
/**
|
|
|
567 |
* Replaces true & false by !0 and !1.
|
|
|
568 |
*
|
|
|
569 |
* @param string $content
|
|
|
570 |
*
|
|
|
571 |
* @return string
|
|
|
572 |
*/
|
|
|
573 |
protected function shortenBools($content)
|
|
|
574 |
{
|
|
|
575 |
/*
|
|
|
576 |
* 'true' or 'false' could be used as property names (which may be
|
|
|
577 |
* followed by whitespace) - we must not replace those!
|
|
|
578 |
* Since PHP doesn't allow variable-length (to account for the
|
|
|
579 |
* whitespace) lookbehind assertions, I need to capture the leading
|
|
|
580 |
* character and check if it's a `.`
|
|
|
581 |
*/
|
|
|
582 |
$callback = function ($match) {
|
|
|
583 |
if (trim($match[1]) === '.') {
|
|
|
584 |
return $match[0];
|
|
|
585 |
}
|
|
|
586 |
|
|
|
587 |
return $match[1] . ($match[2] === 'true' ? '!0' : '!1');
|
|
|
588 |
};
|
|
|
589 |
$content = preg_replace_callback('/(^|.\s*)\b(true|false)\b(?!:)/', $callback, $content);
|
|
|
590 |
|
|
|
591 |
// for(;;) is exactly the same as while(true), but shorter :)
|
|
|
592 |
$content = preg_replace('/\bwhile\(!0\){/', 'for(;;){', $content);
|
|
|
593 |
|
|
|
594 |
// now make sure we didn't turn any do ... while(true) into do ... for(;;)
|
|
|
595 |
preg_match_all('/\bdo\b/', $content, $dos, PREG_OFFSET_CAPTURE | PREG_SET_ORDER);
|
|
|
596 |
|
|
|
597 |
// go backward to make sure positional offsets aren't altered when $content changes
|
|
|
598 |
$dos = array_reverse($dos);
|
|
|
599 |
foreach ($dos as $do) {
|
|
|
600 |
$offsetDo = $do[0][1];
|
|
|
601 |
|
|
|
602 |
// find all `while` (now `for`) following `do`: one of those must be
|
|
|
603 |
// associated with the `do` and be turned back into `while`
|
|
|
604 |
preg_match_all('/\bfor\(;;\)/', $content, $whiles, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offsetDo);
|
|
|
605 |
foreach ($whiles as $while) {
|
|
|
606 |
$offsetWhile = $while[0][1];
|
|
|
607 |
|
|
|
608 |
$open = substr_count($content, '{', $offsetDo, $offsetWhile - $offsetDo);
|
|
|
609 |
$close = substr_count($content, '}', $offsetDo, $offsetWhile - $offsetDo);
|
|
|
610 |
if ($open === $close) {
|
|
|
611 |
// only restore `while` if amount of `{` and `}` are the same;
|
|
|
612 |
// otherwise, that `for` isn't associated with this `do`
|
|
|
613 |
$content = substr_replace($content, 'while(!0)', $offsetWhile, strlen('for(;;)'));
|
|
|
614 |
break;
|
|
|
615 |
}
|
|
|
616 |
}
|
|
|
617 |
}
|
|
|
618 |
|
|
|
619 |
return $content;
|
|
|
620 |
}
|
|
|
621 |
}
|