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rOACCT/node_modules/csso/lib/usage.js
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usage.js
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			var hasOwnProperty = Object.prototype.hasOwnProperty;

			function buildMap(list, caseInsensitive) {
			var map = Object.create(null);

			if (!Array.isArray(list)) {
			return null;
			}

			for (var i = 0; i < list.length; i++) {
			var name = list[i];

			if (caseInsensitive) {
			name = name.toLowerCase();
			}

			map[name] = true;
			}

			return map;
			}

			function buildList(data) {
			if (!data) {
			return null;
			}

			var tags = buildMap(data.tags, true);
			var ids = buildMap(data.ids);
			var classes = buildMap(data.classes);

			if (tags === null &&
			ids === null &&
			classes === null) {
			return null;
			}

			return {
			tags: tags,
			ids: ids,
			classes: classes
			};
			}

			function buildIndex(data) {
			var scopes = false;

			if (data.scopes && Array.isArray(data.scopes)) {
			scopes = Object.create(null);

			for (var i = 0; i < data.scopes.length; i++) {
			var list = data.scopes[i];

			if (!list \|\| !Array.isArray(list)) {
			throw new Error('Wrong usage format');
			}

			for (var j = 0; j < list.length; j++) {
			var name = list[j];

			if (hasOwnProperty.call(scopes, name)) {
			throw new Error('Class can\'t be used for several scopes: ' + name);
			}

			scopes[name] = i + 1;
			}
			}
			}

			return {
			whitelist: buildList(data),
			blacklist: buildList(data.blacklist),
			scopes: scopes
			};
			}

			module.exports = {
			buildIndex: buildIndex
			};