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rOACCT/node_modules/css-tree/lib/syntax/node/AtrulePrelude.js
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AtrulePrelude.js
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			var TYPE = require('../../tokenizer').TYPE;

			var SEMICOLON = TYPE.Semicolon;
			var LEFTCURLYBRACKET = TYPE.LeftCurlyBracket;

			module.exports = {
			name: 'AtrulePrelude',
			structure: {
			children: [[]]
			},
			parse: function(name) {
			var children = null;

			if (name !== null) {
			name = name.toLowerCase();
			}

			this.scanner.skipSC();

			if (this.atrule.hasOwnProperty(name) &&
			typeof this.atrule[name].prelude === 'function') {
			// custom consumer
			children = this.atrule[name].prelude.call(this);
			} else {
			// default consumer
			children = this.readSequence(this.scope.AtrulePrelude);
			}

			this.scanner.skipSC();

			if (this.scanner.eof !== true &&
			this.scanner.tokenType !== LEFTCURLYBRACKET &&
			this.scanner.tokenType !== SEMICOLON) {
			this.error('Semicolon or block is expected');
			}

			if (children === null) {
			children = this.createList();
			}

			return {
			type: 'AtrulePrelude',
			loc: this.getLocationFromList(children),
			children: children
			};
			},
			generate: function(node) {
			this.children(node);
			},
			walkContext: 'atrulePrelude'
			};