-
Notifications
You must be signed in to change notification settings - Fork 324
/
optimizer.js
276 lines (236 loc) · 9.74 KB
/
optimizer.js
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
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
var processableInfo = require('./processable');
var overrideCompactor = require('./override-compactor');
var shorthandCompactor = require('./shorthand-compactor');
module.exports = function Optimizer(compatibility, aggressiveMerging) {
var overridable = {
'animation-delay': ['animation'],
'animation-direction': ['animation'],
'animation-duration': ['animation'],
'animation-fill-mode': ['animation'],
'animation-iteration-count': ['animation'],
'animation-name': ['animation'],
'animation-play-state': ['animation'],
'animation-timing-function': ['animation'],
'-moz-animation-delay': ['-moz-animation'],
'-moz-animation-direction': ['-moz-animation'],
'-moz-animation-duration': ['-moz-animation'],
'-moz-animation-fill-mode': ['-moz-animation'],
'-moz-animation-iteration-count': ['-moz-animation'],
'-moz-animation-name': ['-moz-animation'],
'-moz-animation-play-state': ['-moz-animation'],
'-moz-animation-timing-function': ['-moz-animation'],
'-o-animation-delay': ['-o-animation'],
'-o-animation-direction': ['-o-animation'],
'-o-animation-duration': ['-o-animation'],
'-o-animation-fill-mode': ['-o-animation'],
'-o-animation-iteration-count': ['-o-animation'],
'-o-animation-name': ['-o-animation'],
'-o-animation-play-state': ['-o-animation'],
'-o-animation-timing-function': ['-o-animation'],
'-webkit-animation-delay': ['-webkit-animation'],
'-webkit-animation-direction': ['-webkit-animation'],
'-webkit-animation-duration': ['-webkit-animation'],
'-webkit-animation-fill-mode': ['-webkit-animation'],
'-webkit-animation-iteration-count': ['-webkit-animation'],
'-webkit-animation-name': ['-webkit-animation'],
'-webkit-animation-play-state': ['-webkit-animation'],
'-webkit-animation-timing-function': ['-webkit-animation'],
'background-attachment': ['background'],
'background-clip': ['background'],
'background-color': ['background'],
'background-image': ['background'],
'background-origin': ['background'],
'background-position': ['background'],
'background-repeat': ['background'],
'background-size': ['background'],
'border-color': ['border'],
'border-style': ['border'],
'border-width': ['border'],
'border-bottom': ['border'],
'border-bottom-color': ['border-bottom', 'border-color', 'border'],
'border-bottom-style': ['border-bottom', 'border-style', 'border'],
'border-bottom-width': ['border-bottom', 'border-width', 'border'],
'border-left': ['border'],
'border-left-color': ['border-left', 'border-color', 'border'],
'border-left-style': ['border-left', 'border-style', 'border'],
'border-left-width': ['border-left', 'border-width', 'border'],
'border-right': ['border'],
'border-right-color': ['border-right', 'border-color', 'border'],
'border-right-style': ['border-right', 'border-style', 'border'],
'border-right-width': ['border-right', 'border-width', 'border'],
'border-top': ['border'],
'border-top-color': ['border-top', 'border-color', 'border'],
'border-top-style': ['border-top', 'border-style', 'border'],
'border-top-width': ['border-top', 'border-width', 'border'],
'font-family': ['font'],
'font-size': ['font'],
'font-style': ['font'],
'font-variant': ['font'],
'font-weight': ['font'],
'list-style-image': ['list'],
'list-style-position': ['list'],
'list-style-type': ['list'],
'margin-bottom': ['margin'],
'margin-left': ['margin'],
'margin-right': ['margin'],
'margin-top': ['margin'],
'outline-color': ['outline'],
'outline-style': ['outline'],
'outline-width': ['outline'],
'padding-bottom': ['padding'],
'padding-left': ['padding'],
'padding-right': ['padding'],
'padding-top': ['padding'],
'transition-delay': ['transition'],
'transition-duration': ['transition'],
'transition-property': ['transition'],
'transition-timing-function': ['transition'],
'-moz-transition-delay': ['-moz-transition'],
'-moz-transition-duration': ['-moz-transition'],
'-moz-transition-property': ['-moz-transition'],
'-moz-transition-timing-function': ['-moz-transition'],
'-o-transition-delay': ['-o-transition'],
'-o-transition-duration': ['-o-transition'],
'-o-transition-property': ['-o-transition'],
'-o-transition-timing-function': ['-o-transition'],
'-webkit-transition-delay': ['-webkit-transition'],
'-webkit-transition-duration': ['-webkit-transition'],
'-webkit-transition-property': ['-webkit-transition'],
'-webkit-transition-timing-function': ['-webkit-transition']
};
var IE_BACKSLASH_HACK = '\\9';
var overrides = {};
for (var granular in overridable) {
for (var i = 0; i < overridable[granular].length; i++) {
var coarse = overridable[granular][i];
var list = overrides[coarse];
if (list)
list.push(granular);
else
overrides[coarse] = [granular];
}
}
var tokenize = function(body) {
var tokens = body.split(';');
var keyValues = [];
if (tokens.length === 0 || (tokens.length == 1 && tokens[0].indexOf(IE_BACKSLASH_HACK) == -1))
return;
for (var i = 0, l = tokens.length; i < l; i++) {
var token = tokens[i];
if (token === '')
continue;
var firstColon = token.indexOf(':');
keyValues.push([
token.substring(0, firstColon),
token.substring(firstColon + 1),
token.indexOf('!important') > -1,
token.indexOf(IE_BACKSLASH_HACK, firstColon + 1) > 0
]);
}
return keyValues;
};
var optimize = function(tokens, allowAdjacent) {
var merged = [];
var properties = [];
var lastProperty = null;
var rescanTrigger = {};
var removeOverridenBy = function(property, isImportant) {
var overrided = overrides[property];
for (var i = 0, l = overrided.length; i < l; i++) {
for (var j = 0; j < properties.length; j++) {
if (properties[j] != overrided[i] || (merged[j][2] && !isImportant))
continue;
merged.splice(j, 1);
properties.splice(j, 1);
j -= 1;
}
}
};
var mergeablePosition = function(position) {
if (allowAdjacent === false || allowAdjacent === true)
return allowAdjacent;
return allowAdjacent.indexOf(position) > -1;
};
tokensLoop:
for (var i = 0, l = tokens.length; i < l; i++) {
var token = tokens[i];
var property = token[0];
var value = token[1];
var isImportant = token[2];
var isIEHack = token[3];
var _property = (property == '-ms-filter' || property == 'filter') ?
(lastProperty == 'background' || lastProperty == 'background-image' ? lastProperty : property) :
property;
var toOverridePosition = 0;
if (!compatibility && isIEHack)
continue;
// comment is necessary - we assume that if two properties are one after another
// then it is intentional way of redefining property which may not be widely supported
// e.g. a{display:inline-block;display:-moz-inline-box}
// however if `mergeablePosition` yields true then the rule does not apply
// (e.g merging two adjacent selectors: `a{display:block}a{display:block}`)
if (aggressiveMerging && _property != lastProperty || mergeablePosition(i)) {
while (true) {
toOverridePosition = properties.indexOf(_property, toOverridePosition);
if (toOverridePosition == -1)
break;
var lastToken = merged[toOverridePosition];
var wasImportant = lastToken[2];
var wasIEHack = lastToken[3];
if (wasImportant && !isImportant)
continue tokensLoop;
if (compatibility && !wasIEHack && isIEHack)
break;
var _info = processableInfo.processable[_property];
if (!isIEHack && !wasIEHack && _info && _info.canOverride && !_info.canOverride(tokens[toOverridePosition][1], value))
break;
merged.splice(toOverridePosition, 1);
properties.splice(toOverridePosition, 1);
}
}
merged.push(token);
properties.push(_property);
// certain properties (see values of `overridable`) should trigger removal of
// more granular properties (see keys of `overridable`)
if (rescanTrigger[_property])
removeOverridenBy(_property, isImportant);
// add rescan triggers - if certain property appears later in the list a rescan needs
// to be triggered, e.g 'border-top' triggers a rescan after 'border-top-width' and
// 'border-top-color' as they can be removed
for (var j = 0, list = overridable[_property] || [], m = list.length; j < m; j++)
rescanTrigger[list[j]] = true;
lastProperty = _property;
}
return merged;
};
var rebuild = function(tokens) {
var flat = [];
for (var i = 0, l = tokens.length; i < l; i++) {
flat.push(tokens[i][0] + ':' + tokens[i][1]);
}
return flat.join(';');
};
var compact = function (input) {
var processable = processableInfo.processable;
var Token = processableInfo.Token;
var tokens = Token.tokenize(input);
tokens = overrideCompactor.compactOverrides(tokens, processable);
tokens = shorthandCompactor.compactShorthands(tokens, false, processable, Token);
tokens = shorthandCompactor.compactShorthands(tokens, true, processable, Token);
return Token.detokenize(tokens);
};
return {
process: function(body, allowAdjacent, skipCompacting) {
var result = body;
var tokens = tokenize(body);
if (tokens) {
var optimized = optimize(tokens, allowAdjacent);
result = rebuild(optimized);
}
if (!skipCompacting) {
result = compact(result);
}
return result;
}
};
};