--- /dev/null
+'use strict';
+
+function _defaults(obj, defaults) { var keys = Object.getOwnPropertyNames(defaults); for (var i = 0; i < keys.length; i++) { var key = keys[i]; var value = Object.getOwnPropertyDescriptor(defaults, key); if (value && value.configurable && obj[key] === undefined) { Object.defineProperty(obj, key, value); } } return obj; }
+
+function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
+
+function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }
+
+function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : _defaults(subClass, superClass); }
+
+var Prefixer = require('./prefixer');
+
+var AtRule = function (_Prefixer) {
+ _inherits(AtRule, _Prefixer);
+
+ function AtRule() {
+ _classCallCheck(this, AtRule);
+
+ return _possibleConstructorReturn(this, _Prefixer.apply(this, arguments));
+ }
+
+ /**
+ * Clone and add prefixes for at-rule
+ */
+ AtRule.prototype.add = function add(rule, prefix) {
+ var prefixed = prefix + rule.name;
+
+ var already = rule.parent.some(function (i) {
+ return i.name === prefixed && i.params === rule.params;
+ });
+ if (already) {
+ return undefined;
+ }
+
+ var cloned = this.clone(rule, { name: prefixed });
+ return rule.parent.insertBefore(rule, cloned);
+ };
+
+ /**
+ * Clone node with prefixes
+ */
+
+
+ AtRule.prototype.process = function process(node) {
+ var parent = this.parentPrefix(node);
+
+ for (var _iterator = this.prefixes, _isArray = Array.isArray(_iterator), _i = 0, _iterator = _isArray ? _iterator : _iterator[Symbol.iterator]();;) {
+ var _ref;
+
+ if (_isArray) {
+ if (_i >= _iterator.length) break;
+ _ref = _iterator[_i++];
+ } else {
+ _i = _iterator.next();
+ if (_i.done) break;
+ _ref = _i.value;
+ }
+
+ var prefix = _ref;
+
+ if (!parent || parent === prefix) {
+ this.add(node, prefix);
+ }
+ }
+ };
+
+ return AtRule;
+}(Prefixer);
+
+module.exports = AtRule;
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