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
|
'use strict';
const types = require('../../tokenizer/types.cjs');
const likelyFeatureToken = new Set([types.Colon, types.RightParenthesis, types.EOF]);
const name = 'Condition';
const structure = {
kind: String,
children: [[
'Identifier',
'Feature',
'FeatureFunction',
'FeatureRange',
'SupportsDeclaration'
]]
};
function featureOrRange(kind) {
if (this.lookupTypeNonSC(1) === types.Ident &&
likelyFeatureToken.has(this.lookupTypeNonSC(2))) {
return this.Feature(kind);
}
return this.FeatureRange(kind);
}
const parentheses = {
media: featureOrRange,
container: featureOrRange,
supports() {
return this.SupportsDeclaration();
}
};
function parse(kind = 'media') {
const children = this.createList();
scan: while (!this.eof) {
switch (this.tokenType) {
case types.Comment:
case types.WhiteSpace:
this.next();
continue;
case types.Ident:
children.push(this.Identifier());
break;
case types.LeftParenthesis: {
let term = this.parseWithFallback(
() => parentheses[kind].call(this, kind),
() => null
);
if (!term) {
term = this.parseWithFallback(
() => {
this.eat(types.LeftParenthesis);
const res = this.Condition(kind);
this.eat(types.RightParenthesis);
return res;
},
() => {
return this.GeneralEnclosed(kind);
}
);
}
children.push(term);
break;
}
case types.Function: {
let term = this.parseWithFallback(
() => this.FeatureFunction(kind),
() => null
);
if (!term) {
term = this.GeneralEnclosed(kind);
}
children.push(term);
break;
}
default:
break scan;
}
}
if (children.isEmpty) {
this.error('Condition is expected');
}
return {
type: 'Condition',
loc: this.getLocationFromList(children),
kind,
children
};
}
function generate(node) {
node.children.forEach(child => {
if (child.type === 'Condition') {
this.token(types.LeftParenthesis, '(');
this.node(child);
this.token(types.RightParenthesis, ')');
} else {
this.node(child);
}
});
}
exports.generate = generate;
exports.name = name;
exports.parse = parse;
exports.structure = structure;
|
