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rOACCT/node_modules/clean-css/lib/optimizer/level-2/properties/optimize.js
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optimize.js
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			var mergeIntoShorthands = require('./merge-into-shorthands');
			var overrideProperties = require('./override-properties');
			var populateComponents = require('./populate-components');

			var restoreWithComponents = require('../restore-with-components');

			var wrapForOptimizing = require('../../wrap-for-optimizing').all;
			var removeUnused = require('../../remove-unused');
			var restoreFromOptimizing = require('../../restore-from-optimizing');

			var OptimizationLevel = require('../../../options/optimization-level').OptimizationLevel;

			function optimizeProperties(properties, withOverriding, withMerging, context) {
			var levelOptions = context.options.level[OptimizationLevel.Two];
			var _properties = wrapForOptimizing(properties, levelOptions.skipProperties);
			var _property;
			var i, l;

			populateComponents(_properties, context.validator, context.warnings);

			for (i = 0, l = _properties.length; i < l; i++) {
			_property = _properties[i];
			if (_property.block) {
			optimizeProperties(_property.value[0][1], withOverriding, withMerging, context);
			}
			}

			if (withMerging && levelOptions.mergeIntoShorthands) {
			mergeIntoShorthands(_properties, context.validator);
			}

			if (withOverriding && levelOptions.overrideProperties) {
			overrideProperties(_properties, withMerging, context.options.compatibility, context.validator);
			}

			restoreFromOptimizing(_properties, restoreWithComponents);
			removeUnused(_properties);
			}

			module.exports = optimizeProperties;