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rOACCT/node_modules/csso/lib/restructure/3-disjoinRuleset.js
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3-disjoinRuleset.js
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			var List = require('css-tree').List;
			var walk = require('css-tree').walk;

			function processRule(node, item, list) {
			var selectors = node.prelude.children;

			// generate new rule sets:
			// .a, .b { color: red; }
			// ->
			// .a { color: red; }
			// .b { color: red; }

			// while there are more than 1 simple selector split for rulesets
			while (selectors.head !== selectors.tail) {
			var newSelectors = new List();
			newSelectors.insert(selectors.remove(selectors.head));

			list.insert(list.createItem({
			type: 'Rule',
			loc: node.loc,
			prelude: {
			type: 'SelectorList',
			loc: node.prelude.loc,
			children: newSelectors
			},
			block: {
			type: 'Block',
			loc: node.block.loc,
			children: node.block.children.copy()
			},
			pseudoSignature: node.pseudoSignature
			}), item);
			}
			}

			module.exports = function disjoinRule(ast) {
			walk(ast, {
			visit: 'Rule',
			reverse: true,
			enter: processRule
			});
			};