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import {
Function as FunctionToken,
RightParenthesis
} from '../../tokenizer/index.js';
export const name = 'FeatureFunction';
export const structure = {
kind: String,
feature: String,
value: ['Declaration', 'Selector']
};
function getFeatureParser(kind, name) {
const featuresOfKind = this.features[kind] || {};
const parser = featuresOfKind[name];
if (typeof parser !== 'function') {
this.error(`Unknown feature ${name}()`);
}
return parser;
}
export function parse(kind = 'unknown') {
const start = this.tokenStart;
const functionName = this.consumeFunctionName();
const valueParser = getFeatureParser.call(this, kind, functionName.toLowerCase());
this.skipSC();
const value = this.parseWithFallback(
() => {
const startValueToken = this.tokenIndex;
const value = valueParser.call(this);
if (this.eof === false &&
this.isBalanceEdge(startValueToken) === false) {
this.error();
}
return value;
},
() => this.Raw(null, false)
);
if (!this.eof) {
this.eat(RightParenthesis);
}
return {
type: 'FeatureFunction',
loc: this.getLocation(start, this.tokenStart),
kind,
feature: functionName,
value
};
}
export function generate(node) {
this.token(FunctionToken, node.feature + '(');
this.node(node.value);
this.token(RightParenthesis, ')');
}
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