101 lines
2.4 KiB
JavaScript
101 lines
2.4 KiB
JavaScript
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import {
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AtKeyword,
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Semicolon,
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LeftCurlyBracket,
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RightCurlyBracket
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} from '../../tokenizer/index.js';
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function consumeRaw(startToken) {
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return this.Raw(startToken, this.consumeUntilLeftCurlyBracketOrSemicolon, true);
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}
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function isDeclarationBlockAtrule() {
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for (let offset = 1, type; type = this.lookupType(offset); offset++) {
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if (type === RightCurlyBracket) {
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return true;
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}
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if (type === LeftCurlyBracket ||
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type === AtKeyword) {
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return false;
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}
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}
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return false;
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}
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export const name = 'Atrule';
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export const walkContext = 'atrule';
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export const structure = {
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name: String,
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prelude: ['AtrulePrelude', 'Raw', null],
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block: ['Block', null]
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};
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export function parse(isDeclaration = false) {
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const start = this.tokenStart;
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let name;
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let nameLowerCase;
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let prelude = null;
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let block = null;
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this.eat(AtKeyword);
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name = this.substrToCursor(start + 1);
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nameLowerCase = name.toLowerCase();
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this.skipSC();
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// parse prelude
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if (this.eof === false &&
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this.tokenType !== LeftCurlyBracket &&
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this.tokenType !== Semicolon) {
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if (this.parseAtrulePrelude) {
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prelude = this.parseWithFallback(this.AtrulePrelude.bind(this, name, isDeclaration), consumeRaw);
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} else {
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prelude = consumeRaw.call(this, this.tokenIndex);
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}
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this.skipSC();
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}
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switch (this.tokenType) {
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case Semicolon:
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this.next();
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break;
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case LeftCurlyBracket:
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if (hasOwnProperty.call(this.atrule, nameLowerCase) &&
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typeof this.atrule[nameLowerCase].block === 'function') {
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block = this.atrule[nameLowerCase].block.call(this, isDeclaration);
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} else {
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// TODO: should consume block content as Raw?
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block = this.Block(isDeclarationBlockAtrule.call(this));
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}
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break;
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}
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return {
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type: 'Atrule',
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loc: this.getLocation(start, this.tokenStart),
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name,
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prelude,
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block
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};
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}
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export function generate(node) {
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this.token(AtKeyword, '@' + node.name);
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if (node.prelude !== null) {
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this.node(node.prelude);
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}
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if (node.block) {
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this.node(node.block);
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} else {
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this.token(Semicolon, ';');
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}
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}
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