/
ensureCompatibility.js
189 lines (171 loc) · 5.31 KB
/
ensureCompatibility.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
import { isSupported } from 'caniuse-api';
import selectorParser from 'postcss-selector-parser';
import vendors from 'vendors';
const simpleSelectorRe = /^#?[-._a-z0-9 ]+$/i;
const cssSel2 = 'css-sel2';
const cssSel3 = 'css-sel3';
const cssGencontent = 'css-gencontent';
const cssFirstLetter = 'css-first-letter';
const cssFirstLine = 'css-first-line';
const cssInOutOfRange = 'css-in-out-of-range';
/** @type {string[]} */
const prefixes = vendors.map((v) => `-${v}-`);
/**
* @param {string} selector
* @return {string[]}
*/
export function filterPrefixes(selector) {
return prefixes.filter((prefix) => selector.indexOf(prefix) !== -1);
}
// Internet Explorer use :-ms-input-placeholder.
// Microsoft Edge use ::-ms-input-placeholder.
const findMsInputPlaceholder = (selector) =>
~selector.search(/-ms-input-placeholder/i);
export function sameVendor(selectorsA, selectorsB) {
let same = (selectors) => selectors.map(filterPrefixes).join();
let findMsVendor = (selectors) => selectors.find(findMsInputPlaceholder);
return (
same(selectorsA) === same(selectorsB) &&
!(findMsVendor(selectorsA) && findMsVendor(selectorsB))
);
}
/**
* @param {string} selector
* @return {boolean}
*/
export function noVendor(selector) {
return !filterPrefixes(selector).length;
}
export const pseudoElements = {
':active': cssSel2,
':after': cssGencontent,
':before': cssGencontent,
':checked': cssSel3,
':default': 'css-default-pseudo',
':dir': 'css-dir-pseudo',
':disabled': cssSel3,
':empty': cssSel3,
':enabled': cssSel3,
':first-child': cssSel2,
':first-letter': cssFirstLetter,
':first-line': cssFirstLine,
':first-of-type': cssSel3,
':focus': cssSel2,
':focus-within': 'css-focus-within',
':focus-visible': 'css-focus-visible',
':has': 'css-has',
':hover': cssSel2,
':in-range': cssInOutOfRange,
':indeterminate': 'css-indeterminate-pseudo',
':lang': cssSel2,
':last-child': cssSel3,
':last-of-type': cssSel3,
':matches': 'css-matches-pseudo',
':not': cssSel3,
':nth-child': cssSel3,
':nth-last-child': cssSel3,
':nth-last-of-type': cssSel3,
':nth-of-type': cssSel3,
':only-child': cssSel3,
':only-of-type': cssSel3,
':optional': 'css-optional-pseudo',
':out-of-range': cssInOutOfRange,
':placeholder-shown': 'css-placeholder-shown',
':root': cssSel3,
':target': cssSel3,
'::after': cssGencontent,
'::backdrop': 'dialog',
'::before': cssGencontent,
'::first-letter': cssFirstLetter,
'::first-line': cssFirstLine,
'::marker': 'css-marker-pseudo',
'::placeholder': 'css-placeholder',
'::selection': 'css-selection',
};
function isCssMixin(selector) {
return selector[selector.length - 1] === ':';
}
function isHostPseudoClass(selector) {
return selector.includes(':host');
}
const isSupportedCache = {};
// Move to util in future
function isSupportedCached(feature, browsers) {
const key = JSON.stringify({ feature, browsers });
let result = isSupportedCache[key];
if (!result) {
result = isSupported(feature, browsers);
isSupportedCache[key] = result;
}
return result;
}
export function ensureCompatibility(selectors, browsers, compatibilityCache) {
// Should not merge mixins
if (selectors.some(isCssMixin)) {
return false;
}
// Should not merge :host selector https://github.com/angular/angular-cli/issues/18672
if (selectors.some(isHostPseudoClass)) {
return false;
}
return selectors.every((selector) => {
if (simpleSelectorRe.test(selector)) {
return true;
}
if (compatibilityCache && selector in compatibilityCache) {
return compatibilityCache[selector];
}
let compatible = true;
selectorParser((ast) => {
ast.walk((node) => {
const { type, value } = node;
if (type === 'pseudo') {
const entry = pseudoElements[value];
if (!entry && noVendor(value)) {
compatible = false;
}
if (entry && compatible) {
compatible = isSupportedCached(entry, browsers);
}
}
if (type === 'combinator') {
if (~value.indexOf('~')) {
compatible = isSupportedCached(cssSel3, browsers);
}
if (~value.indexOf('>') || ~value.indexOf('+')) {
compatible = isSupportedCached(cssSel2, browsers);
}
}
if (type === 'attribute' && node.attribute) {
// [foo]
if (!node.operator) {
compatible = isSupportedCached(cssSel2, browsers);
}
if (value) {
// [foo="bar"], [foo~="bar"], [foo|="bar"]
if (~['=', '~=', '|='].indexOf(node.operator)) {
compatible = isSupportedCached(cssSel2, browsers);
}
// [foo^="bar"], [foo$="bar"], [foo*="bar"]
if (~['^=', '$=', '*='].indexOf(node.operator)) {
compatible = isSupportedCached(cssSel3, browsers);
}
}
// [foo="bar" i]
if (node.insensitive) {
compatible = isSupportedCached('css-case-insensitive', browsers);
}
}
if (!compatible) {
// If this node was not compatible,
// break out early from walking the rest
return false;
}
});
}).processSync(selector);
if (compatibilityCache) {
compatibilityCache[selector] = compatible;
}
return compatible;
});
}