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rOACCT/node_modules/csso/lib/restructure/prepare/createDeclarationIndexer.js
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createDeclarationIndexer.js
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			var generate = require('css-tree').generate;

			function Index() {
			this.seed = 0;
			this.map = Object.create(null);
			}

			Index.prototype.resolve = function(str) {
			var index = this.map[str];

			if (!index) {
			index = ++this.seed;
			this.map[str] = index;
			}

			return index;
			};

			module.exports = function createDeclarationIndexer() {
			var ids = new Index();

			return function markDeclaration(node) {
			var id = generate(node);

			node.id = ids.resolve(id);
			node.length = id.length;
			node.fingerprint = null;

			return node;
			};
			};