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

			var IDENT = TYPE.Ident;
			var FUNCTION = TYPE.Function;
			var COLON = TYPE.Colon;
			var RIGHTPARENTHESIS = TYPE.RightParenthesis;

			// :: [ <ident> \| <function-token> <any-value>? ) ]
			module.exports = {
			name: 'PseudoElementSelector',
			structure: {
			name: String,
			children: [['Raw'], null]
			},
			parse: function() {
			var start = this.scanner.tokenStart;
			var children = null;
			var name;
			var nameLowerCase;

			this.eat(COLON);
			this.eat(COLON);

			if (this.scanner.tokenType === FUNCTION) {
			name = this.consumeFunctionName();
			nameLowerCase = name.toLowerCase();

			if (this.pseudo.hasOwnProperty(nameLowerCase)) {
			this.scanner.skipSC();
			children = this.pseudo[nameLowerCase].call(this);
			this.scanner.skipSC();
			} else {
			children = this.createList();
			children.push(
			this.Raw(this.scanner.tokenIndex, null, false)
			);
			}

			this.eat(RIGHTPARENTHESIS);
			} else {
			name = this.consume(IDENT);
			}

			return {
			type: 'PseudoElementSelector',
			loc: this.getLocation(start, this.scanner.tokenStart),
			name: name,
			children: children
			};
			},
			generate: function(node) {
			this.chunk('::');
			this.chunk(node.name);

			if (node.children !== null) {
			this.chunk('(');
			this.children(node);
			this.chunk(')');
			}
			},
			walkContext: 'function'
			};