78 lines
1.6 KiB
JavaScript
78 lines
1.6 KiB
JavaScript
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import {
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Ident,
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Number,
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Dimension,
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LeftParenthesis,
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RightParenthesis,
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Colon,
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Delim
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} from '../../tokenizer/index.js';
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export const name = 'MediaFeature';
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export const structure = {
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name: String,
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value: ['Identifier', 'Number', 'Dimension', 'Ratio', null]
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};
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export function parse() {
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const start = this.tokenStart;
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let name;
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let value = null;
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this.eat(LeftParenthesis);
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this.skipSC();
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name = this.consume(Ident);
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this.skipSC();
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if (this.tokenType !== RightParenthesis) {
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this.eat(Colon);
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this.skipSC();
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switch (this.tokenType) {
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case Number:
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if (this.lookupNonWSType(1) === Delim) {
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value = this.Ratio();
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} else {
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value = this.Number();
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}
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break;
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case Dimension:
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value = this.Dimension();
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break;
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case Ident:
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value = this.Identifier();
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break;
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default:
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this.error('Number, dimension, ratio or identifier is expected');
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}
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this.skipSC();
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}
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this.eat(RightParenthesis);
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return {
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type: 'MediaFeature',
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loc: this.getLocation(start, this.tokenStart),
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name,
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value
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};
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}
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export function generate(node) {
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this.token(LeftParenthesis, '(');
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this.token(Ident, node.name);
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if (node.value !== null) {
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this.token(Colon, ':');
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this.node(node.value);
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}
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this.token(RightParenthesis, ')');
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}
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