Atrule.js•2.42 kB
import {
AtKeyword,
Semicolon,
LeftCurlyBracket,
RightCurlyBracket
} from '../../tokenizer/index.js';
function consumeRaw(startToken) {
return this.Raw(startToken, this.consumeUntilLeftCurlyBracketOrSemicolon, true);
}
function isDeclarationBlockAtrule() {
for (let offset = 1, type; type = this.lookupType(offset); offset++) {
if (type === RightCurlyBracket) {
return true;
}
if (type === LeftCurlyBracket ||
type === AtKeyword) {
return false;
}
}
return false;
}
export const name = 'Atrule';
export const walkContext = 'atrule';
export const structure = {
name: String,
prelude: ['AtrulePrelude', 'Raw', null],
block: ['Block', null]
};
export function parse(isDeclaration = false) {
const start = this.tokenStart;
let name;
let nameLowerCase;
let prelude = null;
let block = null;
this.eat(AtKeyword);
name = this.substrToCursor(start + 1);
nameLowerCase = name.toLowerCase();
this.skipSC();
// parse prelude
if (this.eof === false &&
this.tokenType !== LeftCurlyBracket &&
this.tokenType !== Semicolon) {
if (this.parseAtrulePrelude) {
prelude = this.parseWithFallback(this.AtrulePrelude.bind(this, name, isDeclaration), consumeRaw);
} else {
prelude = consumeRaw.call(this, this.tokenIndex);
}
this.skipSC();
}
switch (this.tokenType) {
case Semicolon:
this.next();
break;
case LeftCurlyBracket:
if (hasOwnProperty.call(this.atrule, nameLowerCase) &&
typeof this.atrule[nameLowerCase].block === 'function') {
block = this.atrule[nameLowerCase].block.call(this, isDeclaration);
} else {
// TODO: should consume block content as Raw?
block = this.Block(isDeclarationBlockAtrule.call(this));
}
break;
}
return {
type: 'Atrule',
loc: this.getLocation(start, this.tokenStart),
name,
prelude,
block
};
}
export function generate(node) {
this.token(AtKeyword, '@' + node.name);
if (node.prelude !== null) {
this.node(node.prelude);
}
if (node.block) {
this.node(node.block);
} else {
this.token(Semicolon, ';');
}
}