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