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- !function(e,t){"object"==typeof exports&&"undefined"!=typeof module?module.exports=t():"function"==typeof define&&define.amd?define(t):(e=e||self).csstree=t()}(this,(function(){"use strict";function e(e){return{prev:null,next:null,data:e}}function t(e,t,n){var i;return null!==r?(i=r,r=r.cursor,i.prev=t,i.next=n,i.cursor=e.cursor):i={prev:t,next:n,cursor:e.cursor},e.cursor=i,i}function n(e){var t=e.cursor;e.cursor=t.cursor,t.prev=null,t.next=null,t.cursor=r,r=t}var r=null,i=function(){this.cursor=null,this.head=null,this.tail=null};i.createItem=e,i.prototype.createItem=e,i.prototype.updateCursors=function(e,t,n,r){for(var i=this.cursor;null!==i;)i.prev===e&&(i.prev=t),i.next===n&&(i.next=r),i=i.cursor},i.prototype.getSize=function(){for(var e=0,t=this.head;t;)e++,t=t.next;return e},i.prototype.fromArray=function(t){var n=null;this.head=null;for(var r=0;r<t.length;r++){var i=e(t[r]);null!==n?n.next=i:this.head=i,i.prev=n,n=i}return this.tail=n,this},i.prototype.toArray=function(){for(var e=this.head,t=[];e;)t.push(e.data),e=e.next;return t},i.prototype.toJSON=i.prototype.toArray,i.prototype.isEmpty=function(){return null===this.head},i.prototype.first=function(){return this.head&&this.head.data},i.prototype.last=function(){return this.tail&&this.tail.data},i.prototype.each=function(e,r){var i;void 0===r&&(r=this);for(var a=t(this,null,this.head);null!==a.next;)i=a.next,a.next=i.next,e.call(r,i.data,i,this);n(this)},i.prototype.forEach=i.prototype.each,i.prototype.eachRight=function(e,r){var i;void 0===r&&(r=this);for(var a=t(this,this.tail,null);null!==a.prev;)i=a.prev,a.prev=i.prev,e.call(r,i.data,i,this);n(this)},i.prototype.forEachRight=i.prototype.eachRight,i.prototype.nextUntil=function(e,r,i){if(null!==e){var a;void 0===i&&(i=this);for(var o=t(this,null,e);null!==o.next&&(a=o.next,o.next=a.next,!r.call(i,a.data,a,this)););n(this)}},i.prototype.prevUntil=function(e,r,i){if(null!==e){var a;void 0===i&&(i=this);for(var o=t(this,e,null);null!==o.prev&&(a=o.prev,o.prev=a.prev,!r.call(i,a.data,a,this)););n(this)}},i.prototype.some=function(e,t){var n=this.head;for(void 0===t&&(t=this);null!==n;){if(e.call(t,n.data,n,this))return!0;n=n.next}return!1},i.prototype.map=function(e,t){var n=new i,r=this.head;for(void 0===t&&(t=this);null!==r;)n.appendData(e.call(t,r.data,r,this)),r=r.next;return n},i.prototype.filter=function(e,t){var n=new i,r=this.head;for(void 0===t&&(t=this);null!==r;)e.call(t,r.data,r,this)&&n.appendData(r.data),r=r.next;return n},i.prototype.clear=function(){this.head=null,this.tail=null},i.prototype.copy=function(){for(var t=new i,n=this.head;null!==n;)t.insert(e(n.data)),n=n.next;return t},i.prototype.prepend=function(e){return this.updateCursors(null,e,this.head,e),null!==this.head?(this.head.prev=e,e.next=this.head):this.tail=e,this.head=e,this},i.prototype.prependData=function(t){return this.prepend(e(t))},i.prototype.append=function(e){return this.insert(e)},i.prototype.appendData=function(t){return this.insert(e(t))},i.prototype.insert=function(e,t){if(null!=t)if(this.updateCursors(t.prev,e,t,e),null===t.prev){if(this.head!==t)throw new Error("before doesn't belong to list");this.head=e,t.prev=e,e.next=t,this.updateCursors(null,e)}else t.prev.next=e,e.prev=t.prev,t.prev=e,e.next=t;else this.updateCursors(this.tail,e,null,e),null!==this.tail?(this.tail.next=e,e.prev=this.tail):this.head=e,this.tail=e;return this},i.prototype.insertData=function(t,n){return this.insert(e(t),n)},i.prototype.remove=function(e){if(this.updateCursors(e,e.prev,e,e.next),null!==e.prev)e.prev.next=e.next;else{if(this.head!==e)throw new Error("item doesn't belong to list");this.head=e.next}if(null!==e.next)e.next.prev=e.prev;else{if(this.tail!==e)throw new Error("item doesn't belong to list");this.tail=e.prev}return e.prev=null,e.next=null,e},i.prototype.push=function(t){this.insert(e(t))},i.prototype.pop=function(){if(null!==this.tail)return this.remove(this.tail)},i.prototype.unshift=function(t){this.prepend(e(t))},i.prototype.shift=function(){if(null!==this.head)return this.remove(this.head)},i.prototype.prependList=funct
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