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var TYPE = require('../../tokenizer').TYPE;
var rawMode = require('./Raw').mode;
var ATKEYWORD = TYPE.AtKeyword;
var SEMICOLON = TYPE.Semicolon;
var LEFTCURLYBRACKET = TYPE.LeftCurlyBracket;
var RIGHTCURLYBRACKET = TYPE.RightCurlyBracket;
function consumeRaw(startToken) {
return this.Raw(startToken, rawMode.leftCurlyBracketOrSemicolon, true);
}
function isDeclarationBlockAtrule() {
for (var offset = 1, type; type = this.scanner.lookupType(offset); offset++) {
if (type === RIGHTCURLYBRACKET) {
return true;
}
if (type === LEFTCURLYBRACKET ||
type === ATKEYWORD) {
return false;
}
}
return false;
}
module.exports = {
name: 'Atrule',
structure: {
name: String,
prelude: ['AtrulePrelude', 'Raw', null],
block: ['Block', null]
},
parse: function() {
var start = this.scanner.tokenStart;
var name;
var nameLowerCase;
var prelude = null;
var block = null;
this.eat(ATKEYWORD);
name = this.scanner.substrToCursor(start + 1);
nameLowerCase = name.toLowerCase();
this.scanner.skipSC();
// parse prelude
if (this.scanner.eof === false &&
this.scanner.tokenType !== LEFTCURLYBRACKET &&
this.scanner.tokenType !== SEMICOLON) {
if (this.parseAtrulePrelude) {
prelude = this.parseWithFallback(this.AtrulePrelude.bind(this, name), consumeRaw);
// turn empty AtrulePrelude into null
if (prelude.type === 'AtrulePrelude' && prelude.children.head === null) {
prelude = null;
}
} else {
prelude = consumeRaw.call(this, this.scanner.tokenIndex);
}
this.scanner.skipSC();
}
switch (this.scanner.tokenType) {
case SEMICOLON:
this.scanner.next();
break;
case LEFTCURLYBRACKET:
if (this.atrule.hasOwnProperty(nameLowerCase) &&
typeof this.atrule[nameLowerCase].block === 'function') {
block = this.atrule[nameLowerCase].block.call(this);
} else {
// TODO: should consume block content as Raw?
block = this.Block(isDeclarationBlockAtrule.call(this));
}
break;
}
return {
type: 'Atrule',
loc: this.getLocation(start, this.scanner.tokenStart),
name: name,
prelude: prelude,
block: block
};
},
generate: function(node) {
this.chunk('@');
this.chunk(node.name);
if (node.prelude !== null) {
this.chunk(' ');
this.node(node.prelude);
}
if (node.block) {
this.node(node.block);
} else {
this.chunk(';');
}
},
walkContext: 'atrule'
};