70 lines
1.6 KiB
JavaScript
70 lines
1.6 KiB
JavaScript
'use strict';
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const types = require('../../tokenizer/types.cjs');
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const name = 'SupportsDeclaration';
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const structure = {
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feature: String,
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value: 'Declaration'
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};
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function parse() {
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const start = this.tokenStart;
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let featureName = 'declaration';
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let valueParser = this.Declaration;
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if (this.tokenType === types.Function) {
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featureName = this.consumeFunctionName();
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valueParser = this.supportsFeature[featureName.toLowerCase()];
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if (!valueParser) {
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this.error(`Unknown supports feature ${featureName.toLowerCase()}()`);
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}
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} else {
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this.eat(types.LeftParenthesis);
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}
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this.skipSC();
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const value = this.parseWithFallback(
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() => {
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const startValueToken = this.tokenIndex;
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const value = valueParser.call(this);
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if (this.eof === false &&
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this.isBalanceEdge(startValueToken) === false) {
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this.error();
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}
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return value;
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},
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(startToken) => this.Raw(startToken, null, false)
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);
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if (!this.eof) {
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this.eat(types.RightParenthesis);
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}
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return {
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type: 'SupportsDeclaration',
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loc: this.getLocation(start, this.tokenStart),
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feature: featureName,
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value
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};
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}
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function generate(node) {
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if (node.feature !== 'declaration') {
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this.token(types.Function, node.feature + '(');
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} else {
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this.token(types.LeftParenthesis, '(');
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}
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this.node(node.value);
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this.token(types.RightParenthesis, ')');
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}
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exports.generate = generate;
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exports.name = name;
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exports.parse = parse;
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exports.structure = structure;
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