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rOACCT/node_modules/clean-css/lib/optimizer/level-2/remove-duplicate-font-at-rules.js
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remove-duplicate-font-at-rules.js
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			var Token = require('../../tokenizer/token');

			var serializeAll = require('../../writer/one-time').all;

			var FONT_FACE_SCOPE = '@font-face';

			function removeDuplicateFontAtRules(tokens) {
			var fontAtRules = [];
			var token;
			var key;
			var i, l;

			for (i = 0, l = tokens.length; i < l; i++) {
			token = tokens[i];

			if (token[0] != Token.AT_RULE_BLOCK && token[1][0][1] != FONT_FACE_SCOPE) {
			continue;
			}

			key = serializeAll([token]);

			if (fontAtRules.indexOf(key) > -1) {
			token[2] = [];
			} else {
			fontAtRules.push(key);
			}
			}
			}

			module.exports = removeDuplicateFontAtRules;