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rOACCT/node_modules/csso/lib/restructure/8-restructRuleset.js
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8-restructRuleset.js
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			var List = require('css-tree').List;
			var walk = require('css-tree').walk;
			var utils = require('./utils');

			function calcSelectorLength(list) {
			var length = 0;

			list.each(function(data) {
			length += data.id.length + 1;
			});

			return length - 1;
			}

			function calcDeclarationsLength(tokens) {
			var length = 0;

			for (var i = 0; i < tokens.length; i++) {
			length += tokens[i].length;
			}

			return (
			length + // declarations
			tokens.length - 1 // delimeters
			);
			}

			function processRule(node, item, list) {
			var avoidRulesMerge = this.block !== null ? this.block.avoidRulesMerge : false;
			var selectors = node.prelude.children;
			var block = node.block;
			var disallowDownMarkers = Object.create(null);
			var allowMergeUp = true;
			var allowMergeDown = true;

			list.prevUntil(item.prev, function(prev, prevItem) {
			var prevBlock = prev.block;
			var prevType = prev.type;

			if (prevType !== 'Rule') {
			var unsafe = utils.unsafeToSkipNode.call(selectors, prev);

			if (!unsafe && prevType === 'Atrule' && prevBlock) {
			walk(prevBlock, {
			visit: 'Rule',
			enter: function(node) {
			node.prelude.children.each(function(data) {
			disallowDownMarkers[data.compareMarker] = true;
			});
			}
			});
			}

			return unsafe;
			}

			var prevSelectors = prev.prelude.children;

			if (node.pseudoSignature !== prev.pseudoSignature) {
			return true;
			}

			allowMergeDown = !prevSelectors.some(function(selector) {
			return selector.compareMarker in disallowDownMarkers;
			});

			// try prev ruleset if simpleselectors has no equal specifity and element selector
			if (!allowMergeDown && !allowMergeUp) {
			return true;
			}

			// try to join by selectors
			if (allowMergeUp && utils.isEqualSelectors(prevSelectors, selectors)) {
			prevBlock.children.appendList(block.children);
			list.remove(item);
			return true;
			}

			// try to join by properties
			var diff = utils.compareDeclarations(block.children, prevBlock.children);

			// console.log(diff.eq, diff.ne1, diff.ne2);

			if (diff.eq.length) {
			if (!diff.ne1.length && !diff.ne2.length) {
			// equal blocks
			if (allowMergeDown) {
			utils.addSelectors(selectors, prevSelectors);
			list.remove(prevItem);
			}

			return true;
			} else if (!avoidRulesMerge) { /* probably we don't need to prevent those merges for @keyframes
			TODO: need to be checked */

			if (diff.ne1.length && !diff.ne2.length) {
			// prevBlock is subset block
			var selectorLength = calcSelectorLength(selectors);
			var blockLength = calcDeclarationsLength(diff.eq); // declarations length

			if (allowMergeUp && selectorLength < blockLength) {
			utils.addSelectors(prevSelectors, selectors);
			block.children = new List().fromArray(diff.ne1);
			}
			} else if (!diff.ne1.length && diff.ne2.length) {
			// node is subset of prevBlock
			var selectorLength = calcSelectorLength(prevSelectors);
			var blockLength = calcDeclarationsLength(diff.eq); // declarations length

			if (allowMergeDown && selectorLength < blockLength) {
			utils.addSelectors(selectors, prevSelectors);
			prevBlock.children = new List().fromArray(diff.ne2);
			}
			} else {
			// diff.ne1.length && diff.ne2.length
			// extract equal block
			var newSelector = {
			type: 'SelectorList',
			loc: null,
			children: utils.addSelectors(prevSelectors.copy(), selectors)
			};
			var newBlockLength = calcSelectorLength(newSelector.children) + 2; // selectors length + curly braces length
			var blockLength = calcDeclarationsLength(diff.eq); // declarations length

			// create new ruleset if declarations length greater than
			// ruleset description overhead
			if (blockLength >= newBlockLength) {
			var newItem = list.createItem({
			type: 'Rule',
			loc: null,
			prelude: newSelector,
			block: {
			type: 'Block',
			loc: null,
			children: new List().fromArray(diff.eq)
			},
			pseudoSignature: node.pseudoSignature
			});

			block.children = new List().fromArray(diff.ne1);
			prevBlock.children = new List().fromArray(diff.ne2overrided);

			if (allowMergeUp) {
			list.insert(newItem, prevItem);
			} else {
			list.insert(newItem, item);
			}

			return true;
			}
			}
			}
			}

			if (allowMergeUp) {
			// TODO: disallow up merge only if any property interception only (i.e. diff.ne2overrided.length > 0);
			// await property families to find property interception correctly
			allowMergeUp = !prevSelectors.some(function(prevSelector) {
			return selectors.some(function(selector) {
			return selector.compareMarker === prevSelector.compareMarker;
			});
			});
			}

			prevSelectors.each(function(data) {
			disallowDownMarkers[data.compareMarker] = true;
			});
			});
			}

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