1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
| var DEFAULTS = {
| '*': {
| colors: {
| opacity: true // rgba / hsla
| },
| properties: {
| backgroundClipMerging: true, // background-clip to shorthand
| backgroundOriginMerging: true, // background-origin to shorthand
| backgroundSizeMerging: true, // background-size to shorthand
| colors: true, // any kind of color transformations, like `#ff00ff` to `#f0f` or `#fff` into `red`
| ieBangHack: false, // !ie suffix hacks on IE<8
| ieFilters: false, // whether to preserve `filter` and `-ms-filter` properties
| iePrefixHack: false, // underscore / asterisk prefix hacks on IE
| ieSuffixHack: false, // \9 suffix hacks on IE6-9
| merging: true, // merging properties into one
| shorterLengthUnits: false, // optimize pixel units into `pt`, `pc` or `in` units
| spaceAfterClosingBrace: true, // 'url() no-repeat' to 'url()no-repeat'
| urlQuotes: false, // whether to wrap content of `url()` into quotes or not
| zeroUnits: true // 0[unit] -> 0
| },
| selectors: {
| adjacentSpace: false, // div+ nav Android stock browser hack
| ie7Hack: false, // *+html hack
| mergeablePseudoClasses: [
| ':active',
| ':after',
| ':before',
| ':empty',
| ':checked',
| ':disabled',
| ':empty',
| ':enabled',
| ':first-child',
| ':first-letter',
| ':first-line',
| ':first-of-type',
| ':focus',
| ':hover',
| ':lang',
| ':last-child',
| ':last-of-type',
| ':link',
| ':not',
| ':nth-child',
| ':nth-last-child',
| ':nth-last-of-type',
| ':nth-of-type',
| ':only-child',
| ':only-of-type',
| ':root',
| ':target',
| ':visited'
| ], // selectors with these pseudo-classes can be merged as these are universally supported
| mergeablePseudoElements: [
| '::after',
| '::before',
| '::first-letter',
| '::first-line'
| ], // selectors with these pseudo-elements can be merged as these are universally supported
| mergeLimit: 8191, // number of rules that can be safely merged together
| multiplePseudoMerging: true
| },
| units: {
| ch: true,
| in: true,
| pc: true,
| pt: true,
| rem: true,
| vh: true,
| vm: true, // vm is vmin on IE9+ see https://developer.mozilla.org/en-US/docs/Web/CSS/length
| vmax: true,
| vmin: true,
| vw: true
| }
| }
| };
|
| DEFAULTS.ie11 = DEFAULTS['*'];
|
| DEFAULTS.ie10 = DEFAULTS['*'];
|
| DEFAULTS.ie9 = merge(DEFAULTS['*'], {
| properties: {
| ieFilters: true,
| ieSuffixHack: true
| }
| });
|
| DEFAULTS.ie8 = merge(DEFAULTS.ie9, {
| colors: {
| opacity: false
| },
| properties: {
| backgroundClipMerging: false,
| backgroundOriginMerging: false,
| backgroundSizeMerging: false,
| iePrefixHack: true,
| merging: false
| },
| selectors: {
| mergeablePseudoClasses: [
| ':after',
| ':before',
| ':first-child',
| ':first-letter',
| ':focus',
| ':hover',
| ':visited'
| ],
| mergeablePseudoElements: []
| },
| units: {
| ch: false,
| rem: false,
| vh: false,
| vm: false,
| vmax: false,
| vmin: false,
| vw: false
| }
| });
|
| DEFAULTS.ie7 = merge(DEFAULTS.ie8, {
| properties: {
| ieBangHack: true
| },
| selectors: {
| ie7Hack: true,
| mergeablePseudoClasses: [
| ':first-child',
| ':first-letter',
| ':hover',
| ':visited'
| ]
| },
| });
|
| function compatibilityFrom(source) {
| return merge(DEFAULTS['*'], calculateSource(source));
| }
|
| function merge(source, target) {
| for (var key in source) {
| var value = source[key];
|
| if (typeof value === 'object' && !Array.isArray(value)) {
| target[key] = merge(value, target[key] || {});
| } else {
| target[key] = key in target ? target[key] : value;
| }
| }
|
| return target;
| }
|
| function calculateSource(source) {
| if (typeof source == 'object')
| return source;
|
| if (!/[,\+\-]/.test(source))
| return DEFAULTS[source] || DEFAULTS['*'];
|
| var parts = source.split(',');
| var template = parts[0] in DEFAULTS ?
| DEFAULTS[parts.shift()] :
| DEFAULTS['*'];
|
| source = {};
|
| parts.forEach(function (part) {
| var isAdd = part[0] == '+';
| var key = part.substring(1).split('.');
| var group = key[0];
| var option = key[1];
|
| source[group] = source[group] || {};
| source[group][option] = isAdd;
| });
|
| return merge(template, source);
| }
|
| module.exports = compatibilityFrom;
|
|
