define([],function(){'use strict';return{neverAllowedElements:['script','img','embed','iframe','video','source','object','audio'],generallyAllowedAttributes:['id','class','href','title','style'],forbiddenAttributesByElement:{a:['style']},escapeHtml:function(data,allowedTags){var domParser=new DOMParser(),fragment=domParser.parseFromString('<div></div>','text/html');fragment=fragment.body.childNodes[0];allowedTags=typeof allowedTags==='object'&&allowedTags.length?allowedTags:null;if(allowedTags){fragment.innerHTML=data||'';allowedTags=this._filterProhibitedTags(allowedTags);this._removeComments(fragment);this._removeNotAllowedElements(fragment,allowedTags);this._removeNotAllowedAttributes(fragment);return fragment.innerHTML;}
fragment.textContent=data||'';return fragment.innerHTML;},_filterProhibitedTags:function(tags){return tags.filter(function(n){return this.neverAllowedElements.indexOf(n)===-1;}.bind(this));},_removeComments:function(node){var treeWalker=node.ownerDocument.createTreeWalker(node,NodeFilter.SHOW_COMMENT,function(){return NodeFilter.FILTER_ACCEPT;},false),nodesToRemove=[];while(treeWalker.nextNode()){nodesToRemove.push(treeWalker.currentNode);}
nodesToRemove.forEach(function(nodeToRemove){nodeToRemove.parentNode.removeChild(nodeToRemove);});},_removeNotAllowedElements:function(node,allowedTags){var treeWalker=node.ownerDocument.createTreeWalker(node,NodeFilter.SHOW_ELEMENT,function(currentNode){return allowedTags.indexOf(currentNode.nodeName.toLowerCase())===-1?NodeFilter.FILTER_ACCEPT:NodeFilter.FILTER_SKIP;},false),nodesToRemove=[];while(treeWalker.nextNode()){if(allowedTags.indexOf(treeWalker.currentNode.nodeName.toLowerCase())===-1){nodesToRemove.push(treeWalker.currentNode);}}
nodesToRemove.forEach(function(nodeToRemove){nodeToRemove.parentNode.replaceChild(node.ownerDocument.createTextNode(nodeToRemove.textContent),nodeToRemove);});},_removeNotAllowedAttributes:function(node){var treeWalker=node.ownerDocument.createTreeWalker(node,NodeFilter.SHOW_ELEMENT,function(){return NodeFilter.FILTER_ACCEPT;},false),i,attribute,nodeName,attributesToRemove=[];while(treeWalker.nextNode()){for(i=0;i<treeWalker.currentNode.attributes.length;i++){attribute=treeWalker.currentNode.attributes[i];nodeName=treeWalker.currentNode.nodeName.toLowerCase();if(this.generallyAllowedAttributes.indexOf(attribute.name)===-1||this._checkHrefValue(attribute)||this.forbiddenAttributesByElement[nodeName]&&this.forbiddenAttributesByElement[nodeName].indexOf(attribute.name)!==-1){attributesToRemove.push(attribute);}}}
attributesToRemove.forEach(function(attributeToRemove){attributeToRemove.ownerElement.removeAttribute(attributeToRemove.name);});},_checkHrefValue:function(attribute){return attribute.nodeName==='href'&&attribute.nodeValue.startsWith('javascript');}};});