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