104 lines
2.3 KiB
JavaScript
104 lines
2.3 KiB
JavaScript
import {
|
|
Ident,
|
|
Number,
|
|
Dimension,
|
|
Function as FunctionToken,
|
|
LeftParenthesis,
|
|
RightParenthesis,
|
|
Colon,
|
|
Delim
|
|
} from '../../tokenizer/index.js';
|
|
|
|
const SOLIDUS = 0x002F; // U+002F SOLIDUS (/)
|
|
|
|
export const name = 'Feature';
|
|
export const structure = {
|
|
kind: String,
|
|
name: String,
|
|
value: ['Identifier', 'Number', 'Dimension', 'Ratio', 'Function', null]
|
|
};
|
|
|
|
export function parse(kind) {
|
|
const start = this.tokenStart;
|
|
let name;
|
|
let value = null;
|
|
|
|
this.eat(LeftParenthesis);
|
|
this.skipSC();
|
|
|
|
name = this.consume(Ident);
|
|
this.skipSC();
|
|
|
|
if (this.tokenType !== RightParenthesis) {
|
|
this.eat(Colon);
|
|
this.skipSC();
|
|
|
|
switch (this.tokenType) {
|
|
case Number:
|
|
if (this.lookupNonWSType(1) === Delim) {
|
|
value = this.Ratio();
|
|
} else {
|
|
value = this.Number();
|
|
}
|
|
|
|
break;
|
|
|
|
case Dimension:
|
|
value = this.Dimension();
|
|
break;
|
|
|
|
case Ident:
|
|
value = this.Identifier();
|
|
break;
|
|
|
|
case FunctionToken:
|
|
value = this.parseWithFallback(
|
|
() => {
|
|
const res = this.Function(this.readSequence, this.scope.Value);
|
|
|
|
this.skipSC();
|
|
|
|
if (this.isDelim(SOLIDUS)) {
|
|
this.error();
|
|
}
|
|
|
|
return res;
|
|
},
|
|
() => {
|
|
return this.Ratio();
|
|
}
|
|
);
|
|
break;
|
|
|
|
default:
|
|
this.error('Number, dimension, ratio or identifier is expected');
|
|
}
|
|
|
|
this.skipSC();
|
|
}
|
|
|
|
if (!this.eof) {
|
|
this.eat(RightParenthesis);
|
|
}
|
|
|
|
return {
|
|
type: 'Feature',
|
|
loc: this.getLocation(start, this.tokenStart),
|
|
kind,
|
|
name,
|
|
value
|
|
};
|
|
}
|
|
|
|
export function generate(node) {
|
|
this.token(LeftParenthesis, '(');
|
|
this.token(Ident, node.name);
|
|
|
|
if (node.value !== null) {
|
|
this.token(Colon, ':');
|
|
this.node(node.value);
|
|
}
|
|
|
|
this.token(RightParenthesis, ')');
|
|
}
|