Rev 1308 | Only display areas with differences | Regard whitespace | Details | Blame | Last modification | View Log | RSS feed
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1 | <?php |
1 | <?php |
2 | 2 | ||
3 | /** |
3 | /** |
4 | * JavaScript minifier. |
4 | * JavaScript minifier. |
5 | * |
5 | * |
6 | * Please report bugs on https://github.com/matthiasmullie/minify/issues |
6 | * Please report bugs on https://github.com/matthiasmullie/minify/issues |
7 | * |
7 | * |
8 | * @author Matthias Mullie <minify@mullie.eu> |
8 | * @author Matthias Mullie <minify@mullie.eu> |
9 | * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved |
9 | * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved |
10 | * @license MIT License |
10 | * @license MIT License |
11 | */ |
11 | */ |
12 | 12 | ||
13 | namespace MatthiasMullie\Minify; |
13 | namespace MatthiasMullie\Minify; |
14 | 14 | ||
15 | /** |
15 | /** |
16 | * JavaScript Minifier Class. |
16 | * JavaScript Minifier Class. |
17 | * |
17 | * |
18 | * Please report bugs on https://github.com/matthiasmullie/minify/issues |
18 | * Please report bugs on https://github.com/matthiasmullie/minify/issues |
19 | * |
19 | * |
20 | * @author Matthias Mullie <minify@mullie.eu> |
20 | * @author Matthias Mullie <minify@mullie.eu> |
21 | * @author Tijs Verkoyen <minify@verkoyen.eu> |
21 | * @author Tijs Verkoyen <minify@verkoyen.eu> |
22 | * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved |
22 | * @copyright Copyright (c) 2012, Matthias Mullie. All rights reserved |
23 | * @license MIT License |
23 | * @license MIT License |
24 | */ |
24 | */ |
25 | class JS extends Minify |
25 | class JS extends Minify |
26 | { |
26 | { |
27 | /** |
27 | /** |
28 | * Var-matching regex based on http://stackoverflow.com/a/9337047/802993. |
28 | * Var-matching regex based on http://stackoverflow.com/a/9337047/802993. |
29 | * |
29 | * |
30 | * Note that regular expressions using that bit must have the PCRE_UTF8 |
30 | * Note that regular expressions using that bit must have the PCRE_UTF8 |
31 | * pattern modifier (/u) set. |
31 | * pattern modifier (/u) set. |
32 | * |
32 | * |
33 | * @internal |
33 | * @internal |
34 | * |
34 | * |
35 | * @var string |
35 | * @var string |
36 | */ |
36 | */ |
37 | const REGEX_VARIABLE = 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|
37 | const REGEX_VARIABLE = 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|
38 | 38 | ||
39 | /** |
39 | /** |
40 | * Full list of JavaScript reserved words. |
40 | * Full list of JavaScript reserved words. |
41 | * Will be loaded from /data/js/keywords_reserved.txt. |
41 | * Will be loaded from /data/js/keywords_reserved.txt. |
42 | * |
42 | * |
43 | * @see https://mathiasbynens.be/notes/reserved-keywords |
43 | * @see https://mathiasbynens.be/notes/reserved-keywords |
44 | * |
44 | * |
45 | * @var string[] |
45 | * @var string[] |
46 | */ |
46 | */ |
47 | protected $keywordsReserved = array(); |
47 | protected $keywordsReserved = array(); |
48 | 48 | ||
49 | /** |
49 | /** |
50 | * List of JavaScript reserved words that accept a <variable, value, ...> |
50 | * List of JavaScript reserved words that accept a <variable, value, ...> |
51 | * after them. Some end of lines are not the end of a statement, like with |
51 | * after them. Some end of lines are not the end of a statement, like with |
52 | * these keywords. |
52 | * these keywords. |
53 | * |
53 | * |
54 | * E.g.: we shouldn't insert a ; after this else |
54 | * E.g.: we shouldn't insert a ; after this else |
55 | * else |
55 | * else |
56 | * console.log('this is quite fine') |
56 | * console.log('this is quite fine') |
57 | * |
57 | * |
58 | * Will be loaded from /data/js/keywords_before.txt |
58 | * Will be loaded from /data/js/keywords_before.txt |
59 | * |
59 | * |
60 | * @var string[] |
60 | * @var string[] |
61 | */ |
61 | */ |
62 | protected $keywordsBefore = array(); |
62 | protected $keywordsBefore = array(); |
63 | 63 | ||
64 | /** |
64 | /** |
65 | * List of JavaScript reserved words that accept a <variable, value, ...> |
65 | * List of JavaScript reserved words that accept a <variable, value, ...> |
66 | * before them. Some end of lines are not the end of a statement, like when |
66 | * before them. Some end of lines are not the end of a statement, like when |
67 | * continued by one of these keywords on the newline. |
67 | * continued by one of these keywords on the newline. |
68 | * |
68 | * |
69 | * E.g.: we shouldn't insert a ; before this instanceof |
69 | * E.g.: we shouldn't insert a ; before this instanceof |
70 | * variable |
70 | * variable |
71 | * instanceof String |
71 | * instanceof String |
72 | * |
72 | * |
73 | * Will be loaded from /data/js/keywords_after.txt |
73 | * Will be loaded from /data/js/keywords_after.txt |
74 | * |
74 | * |
75 | * @var string[] |
75 | * @var string[] |
76 | */ |
76 | */ |
77 | protected $keywordsAfter = array(); |
77 | protected $keywordsAfter = array(); |
78 | 78 | ||
79 | /** |
79 | /** |
80 | * List of all JavaScript operators. |
80 | * List of all JavaScript operators. |
81 | * |
81 | * |
82 | * Will be loaded from /data/js/operators.txt |
82 | * Will be loaded from /data/js/operators.txt |
83 | * |
83 | * |
84 | * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators |
84 | * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators |
85 | * |
85 | * |
86 | * @var string[] |
86 | * @var string[] |
87 | */ |
87 | */ |
88 | protected $operators = array(); |
88 | protected $operators = array(); |
89 | 89 | ||
90 | /** |
90 | /** |
91 | * List of JavaScript operators that accept a <variable, value, ...> after |
91 | * List of JavaScript operators that accept a <variable, value, ...> after |
92 | * them. Some end of lines are not the end of a statement, like with these |
92 | * them. Some end of lines are not the end of a statement, like with these |
93 | * operators. |
93 | * operators. |
94 | * |
94 | * |
95 | * Note: Most operators are fine, we've only removed ++ and --. |
95 | * Note: Most operators are fine, we've only removed ++ and --. |
96 | * ++ & -- have to be joined with the value they're in-/decrementing. |
96 | * ++ & -- have to be joined with the value they're in-/decrementing. |
97 | * |
97 | * |
98 | * Will be loaded from /data/js/operators_before.txt |
98 | * Will be loaded from /data/js/operators_before.txt |
99 | * |
99 | * |
100 | * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators |
100 | * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators |
101 | * |
101 | * |
102 | * @var string[] |
102 | * @var string[] |
103 | */ |
103 | */ |
104 | protected $operatorsBefore = array(); |
104 | protected $operatorsBefore = array(); |
105 | 105 | ||
106 | /** |
106 | /** |
107 | * List of JavaScript operators that accept a <variable, value, ...> before |
107 | * List of JavaScript operators that accept a <variable, value, ...> before |
108 | * them. Some end of lines are not the end of a statement, like when |
108 | * them. Some end of lines are not the end of a statement, like when |
109 | * continued by one of these operators on the newline. |
109 | * continued by one of these operators on the newline. |
110 | * |
110 | * |
111 | * Note: Most operators are fine, we've only removed ), ], ++, --, ! and ~. |
111 | * Note: Most operators are fine, we've only removed ), ], ++, --, ! and ~. |
112 | * There can't be a newline separating ! or ~ and whatever it is negating. |
112 | * There can't be a newline separating ! or ~ and whatever it is negating. |
113 | * ++ & -- have to be joined with the value they're in-/decrementing. |
113 | * ++ & -- have to be joined with the value they're in-/decrementing. |
114 | * ) & ] are "special" in that they have lots or usecases. () for example |
114 | * ) & ] are "special" in that they have lots or usecases. () for example |
115 | * is used for function calls, for grouping, in if () and for (), ... |
115 | * is used for function calls, for grouping, in if () and for (), ... |
116 | * |
116 | * |
117 | * Will be loaded from /data/js/operators_after.txt |
117 | * Will be loaded from /data/js/operators_after.txt |
118 | * |
118 | * |
119 | * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators |
119 | * @see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators |
120 | * |
120 | * |
121 | * @var string[] |
121 | * @var string[] |
122 | */ |
122 | */ |
123 | protected $operatorsAfter = array(); |
123 | protected $operatorsAfter = array(); |
124 | 124 | ||
125 | /** |
- | |
126 | * {@inheritdoc} |
- | |
127 | */ |
- | |
128 | public function __construct() |
125 | public function __construct() |
129 | { |
126 | { |
130 | call_user_func_array(array('\\MatthiasMullie\Minify\\Minify', '__construct'), func_get_args()); |
127 | call_user_func_array(array('\\MatthiasMullie\Minify\\Minify', '__construct'), func_get_args()); |
131 | 128 | ||
132 | $dataDir = __DIR__ . '/../data/js/'; |
129 | $dataDir = __DIR__ . '/../data/js/'; |
133 | $options = FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES; |
130 | $options = FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES; |
134 | $this->keywordsReserved = file($dataDir . 'keywords_reserved.txt', $options); |
131 | $this->keywordsReserved = file($dataDir . 'keywords_reserved.txt', $options); |
135 | $this->keywordsBefore = file($dataDir . 'keywords_before.txt', $options); |
132 | $this->keywordsBefore = file($dataDir . 'keywords_before.txt', $options); |
136 | $this->keywordsAfter = file($dataDir . 'keywords_after.txt', $options); |
133 | $this->keywordsAfter = file($dataDir . 'keywords_after.txt', $options); |
137 | $this->operators = file($dataDir . 'operators.txt', $options); |
134 | $this->operators = file($dataDir . 'operators.txt', $options); |
138 | $this->operatorsBefore = file($dataDir . 'operators_before.txt', $options); |
135 | $this->operatorsBefore = file($dataDir . 'operators_before.txt', $options); |
139 | $this->operatorsAfter = file($dataDir . 'operators_after.txt', $options); |
136 | $this->operatorsAfter = file($dataDir . 'operators_after.txt', $options); |
140 | } |
137 | } |
141 | 138 | ||
142 | /** |
139 | /** |
143 | * Minify the data. |
140 | * Minify the data. |
144 | * Perform JS optimizations. |
141 | * Perform JS optimizations. |
145 | * |
142 | * |
146 | * @param string[optional] $path Path to write the data to |
143 | * @param string[optional] $path Path to write the data to |
147 | * |
144 | * |
148 | * @return string The minified data |
145 | * @return string The minified data |
149 | */ |
146 | */ |
150 | public function execute($path = null) |
147 | public function execute($path = null) |
151 | { |
148 | { |
152 | $content = ''; |
149 | $content = ''; |
153 | 150 | ||
154 | /* |
151 | /* |
155 | * Let's first take out strings, comments and regular expressions. |
152 | * Let's first take out strings, comments and regular expressions. |
156 | * All of these can contain JS code-like characters, and we should make |
153 | * All of these can contain JS code-like characters, and we should make |
157 | * sure any further magic ignores anything inside of these. |
154 | * sure any further magic ignores anything inside of these. |
158 | * |
155 | * |
159 | * Consider this example, where we should not strip any whitespace: |
156 | * Consider this example, where we should not strip any whitespace: |
160 | * var str = "a test"; |
157 | * var str = "a test"; |
161 | * |
158 | * |
162 | * Comments will be removed altogether, strings and regular expressions |
159 | * Comments will be removed altogether, strings and regular expressions |
163 | * will be replaced by placeholder text, which we'll restore later. |
160 | * will be replaced by placeholder text, which we'll restore later. |
164 | */ |
161 | */ |
165 | $this->extractStrings('\'"`'); |
162 | $this->extractStrings('\'"`'); |
166 | $this->stripComments(); |
163 | $this->stripComments(); |
167 | $this->extractRegex(); |
164 | $this->extractRegex(); |
168 | 165 | ||
169 | // loop files |
166 | // loop files |
170 | foreach ($this->data as $source => $js) { |
167 | foreach ($this->data as $source => $js) { |
171 | // take out strings, comments & regex (for which we've registered |
168 | // take out strings, comments & regex (for which we've registered |
172 | // the regexes just a few lines earlier) |
169 | // the regexes just a few lines earlier) |
173 | $js = $this->replace($js); |
170 | $js = $this->replace($js); |
174 | 171 | ||
175 | $js = $this->propertyNotation($js); |
172 | $js = $this->propertyNotation($js); |
176 | $js = $this->shortenBools($js); |
173 | $js = $this->shortenBools($js); |
177 | $js = $this->stripWhitespace($js); |
174 | $js = $this->stripWhitespace($js); |
178 | 175 | ||
179 | // combine js: separating the scripts by a ; |
176 | // combine js: separating the scripts by a ; |
180 | $content .= $js . ';'; |
177 | $content .= $js . ';'; |
181 | } |
178 | } |
182 | 179 | ||
183 | // clean up leftover `;`s from the combination of multiple scripts |
180 | // clean up leftover `;`s from the combination of multiple scripts |
184 | $content = ltrim($content, ';'); |
181 | $content = ltrim($content, ';'); |
185 | $content = (string) substr($content, 0, -1); |
182 | $content = (string) substr($content, 0, -1); |
186 | 183 | ||
187 | /* |
184 | /* |
188 | * Earlier, we extracted strings & regular expressions and replaced them |
185 | * Earlier, we extracted strings & regular expressions and replaced them |
189 | * with placeholder text. This will restore them. |
186 | * with placeholder text. This will restore them. |
190 | */ |
187 | */ |
191 | $content = $this->restoreExtractedData($content); |
188 | $content = $this->restoreExtractedData($content); |
192 | 189 | ||
193 | return $content; |
190 | return $content; |
194 | } |
191 | } |
195 | 192 | ||
196 | /** |
193 | /** |
197 | * Strip comments from source code. |
194 | * Strip comments from source code. |
198 | */ |
195 | */ |
199 | protected function stripComments() |
196 | protected function stripComments() |
200 | { |
197 | { |
201 | $this->stripMultilineComments(); |
198 | $this->stripMultilineComments(); |
202 | 199 | ||
203 | // single-line comments |
200 | // single-line comments |
204 | $this->registerPattern('/\/\/.*$/m', ''); |
201 | $this->registerPattern('/\/\/.*$/m', ''); |
205 | } |
202 | } |
206 | 203 | ||
207 | /** |
204 | /** |
208 | * JS can have /-delimited regular expressions, like: /ab+c/.match(string). |
205 | * JS can have /-delimited regular expressions, like: /ab+c/.match(string). |
209 | * |
206 | * |
210 | * The content inside the regex can contain characters that may be confused |
207 | * 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 |
208 | * for JS code: e.g. it could contain whitespace it needs to match & we |
212 | * don't want to strip whitespace in there. |
209 | * don't want to strip whitespace in there. |
213 | * |
210 | * |
214 | * The regex can be pretty simple: we don't have to care about comments, |
211 | * 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 |
212 | * (which also use slashes) because stripComments() will have stripped those |
216 | * already. |
213 | * already. |
217 | * |
214 | * |
218 | * This method will replace all string content with simple REGEX# |
215 | * This method will replace all string content with simple REGEX# |
219 | * placeholder text, so we've rid all regular expressions from characters |
216 | * placeholder text, so we've rid all regular expressions from characters |
220 | * that may be misinterpreted. Original regex content will be saved in |
217 | * that may be misinterpreted. Original regex content will be saved in |
221 | * $this->extracted and after doing all other minifying, we can restore the |
218 | * $this->extracted and after doing all other minifying, we can restore the |
222 | * original content via restoreRegex() |
219 | * original content via restoreRegex() |
223 | */ |
220 | */ |
224 | protected function extractRegex() |
221 | protected function extractRegex() |
225 | { |
222 | { |
226 | // PHP only supports $this inside anonymous functions since 5.4 |
223 | // PHP only supports $this inside anonymous functions since 5.4 |
227 | $minifier = $this; |
224 | $minifier = $this; |
228 | $callback = function ($match) use ($minifier) { |
225 | $callback = function ($match) use ($minifier) { |
229 | $count = count($minifier->extracted); |
226 | $count = count($minifier->extracted); |
230 | $placeholder = '"' . $count . '"'; |
227 | $placeholder = '"' . $count . '"'; |
231 | $minifier->extracted[$placeholder] = $match[0]; |
228 | $minifier->extracted[$placeholder] = $match[0]; |
232 | 229 | ||
233 | return $placeholder; |
230 | return $placeholder; |
234 | }; |
231 | }; |
235 | 232 | ||
236 | // match all chars except `/` and `\` |
233 | // match all chars except `/` and `\` |
237 | // `\` is allowed though, along with whatever char follows (which is the |
234 | // `\` is allowed though, along with whatever char follows (which is the |
238 | // one being escaped) |
235 | // one being escaped) |
239 | // this should allow all chars, except for an unescaped `/` (= the one |
236 | // this should allow all chars, except for an unescaped `/` (= the one |
240 | // closing the regex) |
237 | // closing the regex) |
241 | // then also ignore bare `/` inside `[]`, where they don't need to be |
238 | // then also ignore bare `/` inside `[]`, where they don't need to be |
242 | // escaped: anything inside `[]` can be ignored safely |
239 | // escaped: anything inside `[]` can be ignored safely |
243 | $pattern = '\\/(?!\*)(?:[^\\[\\/\\\\\n\r]++|(?:\\\\.)++|(?:\\[(?:[^\\]\\\\\n\r]++|(?:\\\\.)++)++\\])++)++\\/[gimuy]*'; |
240 | $pattern = '\\/(?!\*)(?:[^\\[\\/\\\\\n\r]++|(?:\\\\.)++|(?:\\[(?:[^\\]\\\\\n\r]++|(?:\\\\.)++)++\\])++)++\\/[gimuy]*'; |
244 | 241 | ||
245 | // a regular expression can only be followed by a few operators or some |
242 | // 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 |
243 | // of the RegExp methods (a `\` followed by a variable or value is |
247 | // likely part of a division, not a regex) |
244 | // likely part of a division, not a regex) |
248 | $keywords = array('do', 'in', 'new', 'else', 'throw', 'yield', 'delete', 'return', 'typeof'); |
245 | $keywords = array('do', 'in', 'new', 'else', 'throw', 'yield', 'delete', 'return', 'typeof'); |
249 | $before = '(^|[=:,;\+\-\*\?\/\}\(\{\[&\|!]|' . implode('|', $keywords) . ')\s*'; |
246 | $before = '(^|[=:,;\+\-\*\?\/\}\(\{\[&\|!]|' . implode('|', $keywords) . ')\s*'; |
250 | $propertiesAndMethods = array( |
247 | $propertiesAndMethods = array( |
251 | // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties_2 |
248 | // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Properties_2 |
252 | 'constructor', |
249 | 'constructor', |
253 | 'flags', |
250 | 'flags', |
254 | 'global', |
251 | 'global', |
255 | 'ignoreCase', |
252 | 'ignoreCase', |
256 | 'multiline', |
253 | 'multiline', |
257 | 'source', |
254 | 'source', |
258 | 'sticky', |
255 | 'sticky', |
259 | 'unicode', |
256 | 'unicode', |
260 | // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2 |
257 | // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/RegExp#Methods_2 |
261 | 'compile(', |
258 | 'compile(', |
262 | 'exec(', |
259 | 'exec(', |
263 | 'test(', |
260 | 'test(', |
264 | 'toSource(', |
261 | 'toSource(', |
265 | 'toString(', |
262 | 'toString(', |
266 | ); |
263 | ); |
267 | $delimiters = array_fill(0, count($propertiesAndMethods), '/'); |
264 | $delimiters = array_fill(0, count($propertiesAndMethods), '/'); |
268 | $propertiesAndMethods = array_map('preg_quote', $propertiesAndMethods, $delimiters); |
265 | $propertiesAndMethods = array_map('preg_quote', $propertiesAndMethods, $delimiters); |
269 | $after = '(?=\s*([\.,;:\)\}&\|+]|\/\/|$|\.(' . implode('|', $propertiesAndMethods) . ')))'; |
266 | $after = '(?=\s*([\.,;:\)\}&\|+]|\/\/|$|\.(' . implode('|', $propertiesAndMethods) . ')))'; |
270 | $this->registerPattern('/' . $before . '\K' . $pattern . $after . '/', $callback); |
267 | $this->registerPattern('/' . $before . '\K' . $pattern . $after . '/', $callback); |
271 | 268 | ||
272 | // regular expressions following a `)` are rather annoying to detect... |
269 | // regular expressions following a `)` are rather annoying to detect... |
273 | // quite often, `/` after `)` is a division operator & if it happens to |
270 | // 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 |
271 | // be followed by another one (or a comment), it is likely to be |
275 | // confused for a regular expression |
272 | // confused for a regular expression |
276 | // however, it's perfectly possible for a regex to follow a `)`: after |
273 | // however, it's perfectly possible for a regex to follow a `)`: after |
277 | // a single-line `if()`, `while()`, ... statement, for example |
274 | // a single-line `if()`, `while()`, ... statement, for example |
278 | // since, when they occur like that, they're always the start of a |
275 | // 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: |
276 | // statement, there's only a limited amount of ways they can be useful: |
280 | // by calling the regex methods directly |
277 | // by calling the regex methods directly |
281 | // if a regex following `)` is not followed by `.<property or method>`, |
278 | // if a regex following `)` is not followed by `.<property or method>`, |
282 | // it's quite likely not a regex |
279 | // it's quite likely not a regex |
283 | $before = '\)\s*'; |
280 | $before = '\)\s*'; |
284 | $after = '(?=\s*\.(' . implode('|', $propertiesAndMethods) . '))'; |
281 | $after = '(?=\s*\.(' . implode('|', $propertiesAndMethods) . '))'; |
285 | $this->registerPattern('/' . $before . '\K' . $pattern . $after . '/', $callback); |
282 | $this->registerPattern('/' . $before . '\K' . $pattern . $after . '/', $callback); |
286 | 283 | ||
287 | // 1 more edge case: a regex can be followed by a lot more operators or |
284 | // 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 |
285 | // keywords if there's a newline (ASI) in between, where the operator |
289 | // actually starts a new statement |
286 | // actually starts a new statement |
290 | // (https://github.com/matthiasmullie/minify/issues/56) |
287 | // (https://github.com/matthiasmullie/minify/issues/56) |
291 | $operators = $this->getOperatorsForRegex($this->operatorsBefore, '/'); |
288 | $operators = $this->getOperatorsForRegex($this->operatorsBefore, '/'); |
292 | $operators += $this->getOperatorsForRegex($this->keywordsReserved, '/'); |
289 | $operators += $this->getOperatorsForRegex($this->keywordsReserved, '/'); |
293 | $after = '(?=\s*\n\s*(' . implode('|', $operators) . '))'; |
290 | $after = '(?=\s*\n\s*(' . implode('|', $operators) . '))'; |
294 | $this->registerPattern('/' . $pattern . $after . '/', $callback); |
291 | $this->registerPattern('/' . $pattern . $after . '/', $callback); |
295 | } |
292 | } |
296 | 293 | ||
297 | /** |
294 | /** |
298 | * Strip whitespace. |
295 | * Strip whitespace. |
299 | * |
296 | * |
300 | * We won't strip *all* whitespace, but as much as possible. The thing that |
297 | * We won't strip *all* whitespace, but as much as possible. The thing that |
301 | * we'll preserve are newlines we're unsure about. |
298 | * we'll preserve are newlines we're unsure about. |
302 | * JavaScript doesn't require statements to be terminated with a semicolon. |
299 | * JavaScript doesn't require statements to be terminated with a semicolon. |
303 | * It will automatically fix missing semicolons with ASI (automatic semi- |
300 | * It will automatically fix missing semicolons with ASI (automatic semi- |
304 | * colon insertion) at the end of line causing errors (without semicolon.) |
301 | * colon insertion) at the end of line causing errors (without semicolon.) |
305 | * |
302 | * |
306 | * Because it's sometimes hard to tell if a newline is part of a statement |
303 | * 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. |
304 | * that should be terminated or not, we'll just leave some of them alone. |
308 | * |
305 | * |
309 | * @param string $content The content to strip the whitespace for |
306 | * @param string $content The content to strip the whitespace for |
310 | * |
307 | * |
311 | * @return string |
308 | * @return string |
312 | */ |
309 | */ |
313 | protected function stripWhitespace($content) |
310 | protected function stripWhitespace($content) |
314 | { |
311 | { |
315 | // uniform line endings, make them all line feed |
312 | // uniform line endings, make them all line feed |
316 | $content = str_replace(array("\r\n", "\r"), "\n", $content); |
313 | $content = str_replace(array("\r\n", "\r"), "\n", $content); |
317 | 314 | ||
318 | // collapse all non-line feed whitespace into a single space |
315 | // collapse all non-line feed whitespace into a single space |
319 | $content = preg_replace('/[^\S\n]+/', ' ', $content); |
316 | $content = preg_replace('/[^\S\n]+/', ' ', $content); |
320 | 317 | ||
321 | // strip leading & trailing whitespace |
318 | // strip leading & trailing whitespace |
322 | $content = str_replace(array(" \n", "\n "), "\n", $content); |
319 | $content = str_replace(array(" \n", "\n "), "\n", $content); |
323 | 320 | ||
324 | // collapse consecutive line feeds into just 1 |
321 | // collapse consecutive line feeds into just 1 |
325 | $content = preg_replace('/\n+/', "\n", $content); |
322 | $content = preg_replace('/\n+/', "\n", $content); |
326 | 323 | ||
327 | $operatorsBefore = $this->getOperatorsForRegex($this->operatorsBefore, '/'); |
324 | $operatorsBefore = $this->getOperatorsForRegex($this->operatorsBefore, '/'); |
328 | $operatorsAfter = $this->getOperatorsForRegex($this->operatorsAfter, '/'); |
325 | $operatorsAfter = $this->getOperatorsForRegex($this->operatorsAfter, '/'); |
329 | $operators = $this->getOperatorsForRegex($this->operators, '/'); |
326 | $operators = $this->getOperatorsForRegex($this->operators, '/'); |
330 | $keywordsBefore = $this->getKeywordsForRegex($this->keywordsBefore, '/'); |
327 | $keywordsBefore = $this->getKeywordsForRegex($this->keywordsBefore, '/'); |
331 | $keywordsAfter = $this->getKeywordsForRegex($this->keywordsAfter, '/'); |
328 | $keywordsAfter = $this->getKeywordsForRegex($this->keywordsAfter, '/'); |
332 | 329 | ||
333 | // strip whitespace that ends in (or next line begin with) an operator |
330 | // strip whitespace that ends in (or next line begin with) an operator |
334 | // that allows statements to be broken up over multiple lines |
331 | // that allows statements to be broken up over multiple lines |
335 | unset($operatorsBefore['+'], $operatorsBefore['-'], $operatorsAfter['+'], $operatorsAfter['-']); |
332 | unset($operatorsBefore['+'], $operatorsBefore['-'], $operatorsAfter['+'], $operatorsAfter['-']); |
336 | $content = preg_replace( |
333 | $content = preg_replace( |
337 | array( |
334 | array( |
338 | '/(' . implode('|', $operatorsBefore) . ')\s+/', |
335 | '/(' . implode('|', $operatorsBefore) . ')\s+/', |
339 | '/\s+(' . implode('|', $operatorsAfter) . ')/', |
336 | '/\s+(' . implode('|', $operatorsAfter) . ')/', |
340 | ), |
337 | ), |
341 | '\\1', |
338 | '\\1', |
342 | $content |
339 | $content |
343 | ); |
340 | ); |
344 | 341 | ||
345 | // make sure + and - can't be mistaken for, or joined into ++ and -- |
342 | // make sure + and - can't be mistaken for, or joined into ++ and -- |
346 | $content = preg_replace( |
343 | $content = preg_replace( |
347 | array( |
344 | array( |
348 | '/(?<![\+\-])\s*([\+\-])(?![\+\-])/', |
345 | '/(?<![\+\-])\s*([\+\-])(?![\+\-])/', |
349 | '/(?<![\+\-])([\+\-])\s*(?![\+\-])/', |
346 | '/(?<![\+\-])([\+\-])\s*(?![\+\-])/', |
350 | ), |
347 | ), |
351 | '\\1', |
348 | '\\1', |
352 | $content |
349 | $content |
353 | ); |
350 | ); |
354 | 351 | ||
355 | // collapse whitespace around reserved words into single space |
352 | // collapse whitespace around reserved words into single space |
356 | $content = preg_replace('/(^|[;\}\s])\K(' . implode('|', $keywordsBefore) . ')\s+/', '\\2 ', $content); |
353 | $content = preg_replace('/(^|[;\}\s])\K(' . implode('|', $keywordsBefore) . ')\s+/', '\\2 ', $content); |
357 | $content = preg_replace('/\s+(' . implode('|', $keywordsAfter) . ')(?=([;\{\s]|$))/', ' \\1', $content); |
354 | $content = preg_replace('/\s+(' . implode('|', $keywordsAfter) . ')(?=([;\{\s]|$))/', ' \\1', $content); |
358 | 355 | ||
359 | /* |
356 | /* |
360 | * We didn't strip whitespace after a couple of operators because they |
357 | * 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 |
358 | * 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 |
359 | * strip the newlines. However, we can safely strip any non-line feed |
363 | * whitespace that follows them. |
360 | * whitespace that follows them. |
364 | */ |
361 | */ |
365 | $operatorsDiffBefore = array_diff($operators, $operatorsBefore); |
362 | $operatorsDiffBefore = array_diff($operators, $operatorsBefore); |
366 | $operatorsDiffAfter = array_diff($operators, $operatorsAfter); |
363 | $operatorsDiffAfter = array_diff($operators, $operatorsAfter); |
367 | $content = preg_replace('/(' . implode('|', $operatorsDiffBefore) . ')[^\S\n]+/', '\\1', $content); |
364 | $content = preg_replace('/(' . implode('|', $operatorsDiffBefore) . ')[^\S\n]+/', '\\1', $content); |
368 | $content = preg_replace('/[^\S\n]+(' . implode('|', $operatorsDiffAfter) . ')/', '\\1', $content); |
365 | $content = preg_replace('/[^\S\n]+(' . implode('|', $operatorsDiffAfter) . ')/', '\\1', $content); |
369 | 366 | ||
370 | /* |
367 | /* |
371 | * Whitespace after `return` can be omitted in a few occasions |
368 | * Whitespace after `return` can be omitted in a few occasions |
372 | * (such as when followed by a string or regex) |
369 | * (such as when followed by a string or regex) |
373 | * Same for whitespace in between `)` and `{`, or between `{` and some |
370 | * Same for whitespace in between `)` and `{`, or between `{` and some |
374 | * keywords. |
371 | * keywords. |
375 | */ |
372 | */ |
376 | $content = preg_replace('/\breturn\s+(["\'\/\+\-])/', 'return$1', $content); |
373 | $content = preg_replace('/\breturn\s+(["\'\/\+\-])/', 'return$1', $content); |
377 | $content = preg_replace('/\)\s+\{/', '){', $content); |
374 | $content = preg_replace('/\)\s+\{/', '){', $content); |
378 | $content = preg_replace('/}\n(else|catch|finally)\b/', '}$1', $content); |
375 | $content = preg_replace('/}\n(else|catch|finally)\b/', '}$1', $content); |
379 | 376 | ||
380 | /* |
377 | /* |
381 | * Get rid of double semicolons, except where they can be used like: |
378 | * 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))". |
379 | * "for(v=1,_=b;;)", "for(v=1;;v++)" or "for(;;ja||(ja=true))". |
383 | * I'll safeguard these double semicolons inside for-loops by |
380 | * I'll safeguard these double semicolons inside for-loops by |
384 | * temporarily replacing them with an invalid condition: they won't have |
381 | * temporarily replacing them with an invalid condition: they won't have |
385 | * a double semicolon and will be easy to spot to restore afterwards. |
382 | * a double semicolon and will be easy to spot to restore afterwards. |
386 | */ |
383 | */ |
387 | $content = preg_replace('/\bfor\(([^;]*);;([^;]*)\)/', 'for(\\1;-;\\2)', $content); |
384 | $content = preg_replace('/\bfor\(([^;]*);;([^;]*)\)/', 'for(\\1;-;\\2)', $content); |
388 | $content = preg_replace('/;+/', ';', $content); |
385 | $content = preg_replace('/;+/', ';', $content); |
389 | $content = preg_replace('/\bfor\(([^;]*);-;([^;]*)\)/', 'for(\\1;;\\2)', $content); |
386 | $content = preg_replace('/\bfor\(([^;]*);-;([^;]*)\)/', 'for(\\1;;\\2)', $content); |
390 | 387 | ||
391 | /* |
388 | /* |
392 | * Next, we'll be removing all semicolons where ASI kicks in. |
389 | * Next, we'll be removing all semicolons where ASI kicks in. |
393 | * for-loops however, can have an empty body (ending in only a |
390 | * 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);` |
391 | * 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 |
392 | * Here, nothing happens during the loop; it's just used to keep |
396 | * increasing `i`. With that ; omitted, the next line would be expected |
393 | * increasing `i`. With that ; omitted, the next line would be expected |
397 | * to be the for-loop's body... Same goes for while loops. |
394 | * 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, |
395 | * 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. |
396 | * 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: |
397 | * Note the special recursive construct in the three inner parts of the for: |
401 | * (\{([^\{\}]*(?-2))*[^\{\}]*\})? - it is intended to match inline |
398 | * (\{([^\{\}]*(?-2))*[^\{\}]*\})? - it is intended to match inline |
402 | * functions bodies, e.g.: i<arr.map(function(e){return e}).length. |
399 | * functions bodies, e.g.: i<arr.map(function(e){return e}).length. |
403 | * Also note that the construct is applied only once and multiplied |
400 | * Also note that the construct is applied only once and multiplied |
404 | * for each part of the for, otherwise it risks a catastrophic backtracking. |
401 | * 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 |
402 | * The limitation is that it will not allow closures in more than one |
406 | * of the three parts for a specific for() case. |
403 | * 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); |
404 | * REGEX throwing catastrophic backtracking: $content = preg_replace('/(for\([^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*;[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*;[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*\));(\}|$)/s', '\\1;;\\8', $content); |
408 | */ |
405 | */ |
409 | $content = preg_replace('/(for\((?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*);[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\4', $content); |
406 | $content = preg_replace('/(for\((?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*);[^;\{]*;[^;\{]*\));(\}|$)/s', '\\1;;\\4', $content); |
410 | $content = preg_replace('/(for\([^;\{]*;(?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*);[^;\{]*\));(\}|$)/s', '\\1;;\\4', $content); |
407 | $content = preg_replace('/(for\([^;\{]*;(?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*);[^;\{]*\));(\}|$)/s', '\\1;;\\4', $content); |
411 | $content = preg_replace('/(for\([^;\{]*;[^;\{]*;(?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*)\));(\}|$)/s', '\\1;;\\4', $content); |
408 | $content = preg_replace('/(for\([^;\{]*;[^;\{]*;(?:[^;\{]*|[^;\{]*function[^;\{]*(\{([^\{\}]*(?-2))*[^\{\}]*\})?[^;\{]*)\));(\}|$)/s', '\\1;;\\4', $content); |
412 | 409 | ||
413 | $content = preg_replace('/(for\([^;\{]+\s+in\s+[^;\{]+\));(\}|$)/s', '\\1;;\\2', $content); |
410 | $content = preg_replace('/(for\([^;\{]+\s+in\s+[^;\{]+\));(\}|$)/s', '\\1;;\\2', $content); |
414 | 411 | ||
415 | /* |
412 | /* |
416 | * Do the same for the if's that don't have a body but are followed by ;} |
413 | * Do the same for the if's that don't have a body but are followed by ;} |
417 | */ |
414 | */ |
418 | $content = preg_replace('/(\bif\s*\([^{;]*\));\}/s', '\\1;;}', $content); |
415 | $content = preg_replace('/(\bif\s*\([^{;]*\));\}/s', '\\1;;}', $content); |
419 | 416 | ||
420 | /* |
417 | /* |
421 | * Below will also keep `;` after a `do{}while();` along with `while();` |
418 | * Below will also keep `;` after a `do{}while();` along with `while();` |
422 | * While these could be stripped after do-while, detecting this |
419 | * While these could be stripped after do-while, detecting this |
423 | * distinction is cumbersome, so I'll play it safe and make sure `;` |
420 | * distinction is cumbersome, so I'll play it safe and make sure `;` |
424 | * after any kind of `while` is kept. |
421 | * after any kind of `while` is kept. |
425 | */ |
422 | */ |
426 | $content = preg_replace('/(while\([^;\{]+\));(\}|$)/s', '\\1;;\\2', $content); |
423 | $content = preg_replace('/(while\([^;\{]+\));(\}|$)/s', '\\1;;\\2', $content); |
427 | 424 | ||
428 | /* |
425 | /* |
429 | * We also can't strip empty else-statements. Even though they're |
426 | * 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 |
427 | * 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. |
428 | * shouldn't be stripping the `;` that follows it as it breaks the code. |
432 | * We can just remove those useless else-statements completely. |
429 | * We can just remove those useless else-statements completely. |
433 | * |
430 | * |
434 | * @see https://github.com/matthiasmullie/minify/issues/91 |
431 | * @see https://github.com/matthiasmullie/minify/issues/91 |
435 | */ |
432 | */ |
436 | $content = preg_replace('/else;/s', '', $content); |
433 | $content = preg_replace('/else;/s', '', $content); |
437 | 434 | ||
438 | /* |
435 | /* |
439 | * We also don't really want to terminate statements followed by closing |
436 | * 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- |
437 | * 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. |
438 | * script: ASI will kick in here & we're all about minifying. |
442 | * Semicolons at beginning of the file don't make any sense either. |
439 | * Semicolons at beginning of the file don't make any sense either. |
443 | */ |
440 | */ |
444 | $content = preg_replace('/;(\}|$)/s', '\\1', $content); |
441 | $content = preg_replace('/;(\}|$)/s', '\\1', $content); |
445 | $content = ltrim($content, ';'); |
442 | $content = ltrim($content, ';'); |
446 | 443 | ||
447 | // get rid of remaining whitespace af beginning/end |
444 | // get rid of remaining whitespace af beginning/end |
448 | return trim($content); |
445 | return trim($content); |
449 | } |
446 | } |
450 | 447 | ||
451 | /** |
448 | /** |
452 | * We'll strip whitespace around certain operators with regular expressions. |
449 | * We'll strip whitespace around certain operators with regular expressions. |
453 | * This will prepare the given array by escaping all characters. |
450 | * This will prepare the given array by escaping all characters. |
454 | * |
451 | * |
455 | * @param string[] $operators |
452 | * @param string[] $operators |
456 | * @param string $delimiter |
453 | * @param string $delimiter |
457 | * |
454 | * |
458 | * @return string[] |
455 | * @return string[] |
459 | */ |
456 | */ |
460 | protected function getOperatorsForRegex(array $operators, $delimiter = '/') |
457 | protected function getOperatorsForRegex(array $operators, $delimiter = '/') |
461 | { |
458 | { |
462 | // escape operators for use in regex |
459 | // escape operators for use in regex |
463 | $delimiters = array_fill(0, count($operators), $delimiter); |
460 | $delimiters = array_fill(0, count($operators), $delimiter); |
464 | $escaped = array_map('preg_quote', $operators, $delimiters); |
461 | $escaped = array_map('preg_quote', $operators, $delimiters); |
465 | 462 | ||
466 | $operators = array_combine($operators, $escaped); |
463 | $operators = array_combine($operators, $escaped); |
467 | 464 | ||
468 | // ignore + & - for now, they'll get special treatment |
465 | // ignore + & - for now, they'll get special treatment |
469 | unset($operators['+'], $operators['-']); |
466 | unset($operators['+'], $operators['-']); |
470 | 467 | ||
471 | // dot can not just immediately follow a number; it can be confused for |
468 | // 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() |
469 | // decimal point, or calling a method on it, e.g. 42 .toString() |
473 | $operators['.'] = '(?<![0-9]\s)\.'; |
470 | $operators['.'] = '(?<![0-9]\s)\.'; |
474 | 471 | ||
475 | // don't confuse = with other assignment shortcuts (e.g. +=) |
472 | // don't confuse = with other assignment shortcuts (e.g. +=) |
476 | $chars = preg_quote('+-*\=<>%&|', $delimiter); |
473 | $chars = preg_quote('+-*\=<>%&|', $delimiter); |
477 | $operators['='] = '(?<![' . $chars . '])\='; |
474 | $operators['='] = '(?<![' . $chars . '])\='; |
478 | 475 | ||
479 | return $operators; |
476 | return $operators; |
480 | } |
477 | } |
481 | 478 | ||
482 | /** |
479 | /** |
483 | * We'll strip whitespace around certain keywords with regular expressions. |
480 | * We'll strip whitespace around certain keywords with regular expressions. |
484 | * This will prepare the given array by escaping all characters. |
481 | * This will prepare the given array by escaping all characters. |
485 | * |
482 | * |
486 | * @param string[] $keywords |
483 | * @param string[] $keywords |
487 | * @param string $delimiter |
484 | * @param string $delimiter |
488 | * |
485 | * |
489 | * @return string[] |
486 | * @return string[] |
490 | */ |
487 | */ |
491 | protected function getKeywordsForRegex(array $keywords, $delimiter = '/') |
488 | protected function getKeywordsForRegex(array $keywords, $delimiter = '/') |
492 | { |
489 | { |
493 | // escape keywords for use in regex |
490 | // escape keywords for use in regex |
494 | $delimiter = array_fill(0, count($keywords), $delimiter); |
491 | $delimiter = array_fill(0, count($keywords), $delimiter); |
495 | $escaped = array_map('preg_quote', $keywords, $delimiter); |
492 | $escaped = array_map('preg_quote', $keywords, $delimiter); |
496 | 493 | ||
497 | // add word boundaries |
494 | // add word boundaries |
498 | array_walk($keywords, function ($value) { |
495 | array_walk($keywords, function ($value) { |
499 | return '\b' . $value . '\b'; |
496 | return '\b' . $value . '\b'; |
500 | }); |
497 | }); |
501 | 498 | ||
502 | $keywords = array_combine($keywords, $escaped); |
499 | $keywords = array_combine($keywords, $escaped); |
503 | 500 | ||
504 | return $keywords; |
501 | return $keywords; |
505 | } |
502 | } |
506 | 503 | ||
507 | /** |
504 | /** |
508 | * Replaces all occurrences of array['key'] by array.key. |
505 | * Replaces all occurrences of array['key'] by array.key. |
509 | * |
506 | * |
510 | * @param string $content |
507 | * @param string $content |
511 | * |
508 | * |
512 | * @return string |
509 | * @return string |
513 | */ |
510 | */ |
514 | protected function propertyNotation($content) |
511 | protected function propertyNotation($content) |
515 | { |
512 | { |
516 | // PHP only supports $this inside anonymous functions since 5.4 |
513 | // PHP only supports $this inside anonymous functions since 5.4 |
517 | $minifier = $this; |
514 | $minifier = $this; |
518 | $keywords = $this->keywordsReserved; |
515 | $keywords = $this->keywordsReserved; |
519 | $callback = function ($match) use ($minifier, $keywords) { |
516 | $callback = function ($match) use ($minifier, $keywords) { |
520 | $property = trim($minifier->extracted[$match[1]], '\'"'); |
517 | $property = trim($minifier->extracted[$match[1]], '\'"'); |
521 | 518 | ||
522 | /* |
519 | /* |
523 | * Check if the property is a reserved keyword. In this context (as |
520 | * Check if the property is a reserved keyword. In this context (as |
524 | * property of an object literal/array) it shouldn't matter, but IE8 |
521 | * property of an object literal/array) it shouldn't matter, but IE8 |
525 | * freaks out with "Expected identifier". |
522 | * freaks out with "Expected identifier". |
526 | */ |
523 | */ |
527 | if (in_array($property, $keywords)) { |
524 | if (in_array($property, $keywords)) { |
528 | return $match[0]; |
525 | return $match[0]; |
529 | } |
526 | } |
530 | 527 | ||
531 | /* |
528 | /* |
532 | * See if the property is in a variable-like format (e.g. |
529 | * 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 '-' |
530 | * array['key-here'] can't be replaced by array.key-here since '-' |
534 | * is not a valid character there. |
531 | * is not a valid character there. |
535 | */ |
532 | */ |
536 | if (!preg_match('/^' . $minifier::REGEX_VARIABLE . '$/u', $property)) { |
533 | if (!preg_match('/^' . $minifier::REGEX_VARIABLE . '$/u', $property)) { |
537 | return $match[0]; |
534 | return $match[0]; |
538 | } |
535 | } |
539 | 536 | ||
540 | return '.' . $property; |
537 | return '.' . $property; |
541 | }; |
538 | }; |
542 | 539 | ||
543 | /* |
540 | /* |
544 | * Figure out if previous character is a variable name (of the array |
541 | * 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 |
542 | * we want to use property notation on) - this is to make sure |
546 | * standalone ['value'] arrays aren't confused for keys-of-an-array. |
543 | * 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 |
544 | * We can (and only have to) check the last character, because PHP's |
548 | * regex implementation doesn't allow unfixed-length look-behind |
545 | * regex implementation doesn't allow unfixed-length look-behind |
549 | * assertions. |
546 | * assertions. |
550 | */ |
547 | */ |
551 | preg_match('/(\[[^\]]+\])[^\]]*$/', static::REGEX_VARIABLE, $previousChar); |
548 | preg_match('/(\[[^\]]+\])[^\]]*$/', static::REGEX_VARIABLE, $previousChar); |
552 | $previousChar = $previousChar[1]; |
549 | $previousChar = $previousChar[1]; |
553 | 550 | ||
554 | /* |
551 | /* |
555 | * Make sure word preceding the ['value'] is not a keyword, e.g. |
552 | * Make sure word preceding the ['value'] is not a keyword, e.g. |
556 | * return['x']. Because -again- PHP's regex implementation doesn't allow |
553 | * 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 |
554 | * unfixed-length look-behind assertions, I'm just going to do a lot of |
558 | * separate look-behind assertions, one for each keyword. |
555 | * separate look-behind assertions, one for each keyword. |
559 | */ |
556 | */ |
560 | $keywords = $this->getKeywordsForRegex($keywords); |
557 | $keywords = $this->getKeywordsForRegex($keywords); |
561 | $keywords = '(?<!' . implode(')(?<!', $keywords) . ')'; |
558 | $keywords = '(?<!' . implode(')(?<!', $keywords) . ')'; |
562 | 559 | ||
563 | return preg_replace_callback('/(?<=' . $previousChar . '|\])' . $keywords . '\[\s*(([\'"])[0-9]+\\2)\s*\]/u', $callback, $content); |
560 | return preg_replace_callback('/(?<=' . $previousChar . '|\])' . $keywords . '\[\s*(([\'"])[0-9]+\\2)\s*\]/u', $callback, $content); |
564 | } |
561 | } |
565 | 562 | ||
566 | /** |
563 | /** |
567 | * Replaces true & false by !0 and !1. |
564 | * Replaces true & false by !0 and !1. |
568 | * |
565 | * |
569 | * @param string $content |
566 | * @param string $content |
570 | * |
567 | * |
571 | * @return string |
568 | * @return string |
572 | */ |
569 | */ |
573 | protected function shortenBools($content) |
570 | protected function shortenBools($content) |
574 | { |
571 | { |
575 | /* |
572 | /* |
576 | * 'true' or 'false' could be used as property names (which may be |
573 | * 'true' or 'false' could be used as property names (which may be |
577 | * followed by whitespace) - we must not replace those! |
574 | * followed by whitespace) - we must not replace those! |
578 | * Since PHP doesn't allow variable-length (to account for the |
575 | * Since PHP doesn't allow variable-length (to account for the |
579 | * whitespace) lookbehind assertions, I need to capture the leading |
576 | * whitespace) lookbehind assertions, I need to capture the leading |
580 | * character and check if it's a `.` |
577 | * character and check if it's a `.` |
581 | */ |
578 | */ |
582 | $callback = function ($match) { |
579 | $callback = function ($match) { |
583 | if (trim($match[1]) === '.') { |
580 | if (trim($match[1]) === '.') { |
584 | return $match[0]; |
581 | return $match[0]; |
585 | } |
582 | } |
586 | 583 | ||
587 | return $match[1] . ($match[2] === 'true' ? '!0' : '!1'); |
584 | return $match[1] . ($match[2] === 'true' ? '!0' : '!1'); |
588 | }; |
585 | }; |
589 | $content = preg_replace_callback('/(^|.\s*)\b(true|false)\b(?!:)/', $callback, $content); |
586 | $content = preg_replace_callback('/(^|.\s*)\b(true|false)\b(?!:)/', $callback, $content); |
590 | 587 | ||
591 | // for(;;) is exactly the same as while(true), but shorter :) |
588 | // for(;;) is exactly the same as while(true), but shorter :) |
592 | $content = preg_replace('/\bwhile\(!0\){/', 'for(;;){', $content); |
589 | $content = preg_replace('/\bwhile\(!0\){/', 'for(;;){', $content); |
593 | 590 | ||
594 | // now make sure we didn't turn any do ... while(true) into do ... for(;;) |
591 | // 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); |
592 | preg_match_all('/\bdo\b/', $content, $dos, PREG_OFFSET_CAPTURE | PREG_SET_ORDER); |
596 | 593 | ||
597 | // go backward to make sure positional offsets aren't altered when $content changes |
594 | // go backward to make sure positional offsets aren't altered when $content changes |
598 | $dos = array_reverse($dos); |
595 | $dos = array_reverse($dos); |
599 | foreach ($dos as $do) { |
596 | foreach ($dos as $do) { |
600 | $offsetDo = $do[0][1]; |
597 | $offsetDo = $do[0][1]; |
601 | 598 | ||
602 | // find all `while` (now `for`) following `do`: one of those must be |
599 | // find all `while` (now `for`) following `do`: one of those must be |
603 | // associated with the `do` and be turned back into `while` |
600 | // associated with the `do` and be turned back into `while` |
604 | preg_match_all('/\bfor\(;;\)/', $content, $whiles, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offsetDo); |
601 | preg_match_all('/\bfor\(;;\)/', $content, $whiles, PREG_OFFSET_CAPTURE | PREG_SET_ORDER, $offsetDo); |
605 | foreach ($whiles as $while) { |
602 | foreach ($whiles as $while) { |
606 | $offsetWhile = $while[0][1]; |
603 | $offsetWhile = $while[0][1]; |
607 | 604 | ||
608 | $open = substr_count($content, '{', $offsetDo, $offsetWhile - $offsetDo); |
605 | $open = substr_count($content, '{', $offsetDo, $offsetWhile - $offsetDo); |
609 | $close = substr_count($content, '}', $offsetDo, $offsetWhile - $offsetDo); |
606 | $close = substr_count($content, '}', $offsetDo, $offsetWhile - $offsetDo); |
610 | if ($open === $close) { |
607 | if ($open === $close) { |
611 | // only restore `while` if amount of `{` and `}` are the same; |
608 | // only restore `while` if amount of `{` and `}` are the same; |
612 | // otherwise, that `for` isn't associated with this `do` |
609 | // otherwise, that `for` isn't associated with this `do` |
613 | $content = substr_replace($content, 'while(!0)', $offsetWhile, strlen('for(;;)')); |
610 | $content = substr_replace($content, 'while(!0)', $offsetWhile, strlen('for(;;)')); |
614 | break; |
611 | break; |
615 | } |
612 | } |
616 | } |
613 | } |
617 | } |
614 | } |
618 | 615 | ||
619 | return $content; |
616 | return $content; |
620 | } |
617 | } |
621 | } |
618 | } |
622 | 619 |