als-layout/layout.js

HTML layout constructor with dynamic meta, styles, and scripts

const alsDocument = (function(){
class Query{
   static get(query){
      let q=new Query(query)
      return q.selectors
   }
    constructor(query){
      this.query=query
      this.selectors=[]
      this.stringValues=[];
      this.parseSelectors(query.split(','))
   }
    parseSelectors(selectors){
      selectors.forEach(selector=>{
         let originalSelector=selector.trim()
         selector=this.removeSpaces(selector)
         this.stringValues=[]
         selector=selector.replace(/\[.*?\]/g,(value)=>{
            this.stringValues.push(value)
            return `[${this.stringValues.length-1}]`
         })
         let [element,ancestors]=this.splitAndCutLast(selector,' ')
         element=this.getFamily(element)
         if (ancestors.length>0)
            element.ancestors=ancestors.map(ancestor=>this.getFamily(ancestor))
         element.group=originalSelector
         this.selectors.push(element)
      });
   }
    splitAndCutLast(string,splitBy){
      const array=string.split(splitBy);
      const last=array.pop();
      return [last,array];
   }
    getFamily(group,element,prev,prevAny,sign){
      if (group.match(/\~|\+/)!==null){
         let [last,prevBrothers]=this.splitAndCutLast(group,/\~|\+/)
         let signs=group.replace(last,'')
         prevBrothers.forEach(el=>signs=signs.replace(el,''))
         signs=signs.match(/\~|\+/g)
         if (signs.length==1){
            sign=signs[0]
         } else if (signs.length>1){
            sign=signs.splice(signs.length-1,signs.length-1)[0]
            prevBrothers[0]=prevBrothers.map((b,i)=>{
               if (i< prevBrothers.length-1) b+=signs[i]
               return b
            }).join('')
            prevBrothers[0]=this.getFamily(prevBrothers[0])
         }
         if (sign=='~') prevAny=prevBrothers[0]
         else if (sign=='+') prev=prevBrothers[0]
         element=last
      } else element=group
      let family
      if (prev || prevAny){
         family=this.getParents(element)
         if (prev) family.prev=this.getParents(prev)
         if (prevAny) family.prevAny=this.getParents(prevAny)
      } else family=this.getParents(element)
      if (family.query!==group) family.group=group
      return family
   }
    getParents(selector){
      if (typeof selector=='string'){
         let [element,parents]=this.splitAndCutLast(selector,'>')
         element=this.buildElement(element)
         parents=parents.map(parent=>this.buildElement(parent))
         if (parents.length>0) element.parents=parents
         return element
      } else return selector
   }
    buildElement(element,id=null,tag=null,classList=[]){
      let query=element
      element=element.replace(/\#(\w-?)*/,$id=>{
         id=$id.replace(/^\#/,''); return ''
      })
      element=element.replace(/\.(\w-?)*/,$class=>{
         classList.push($class.replace(/^\./,'')); return ''
      })
      element=element.replace(/(\w\:?-?)*/,$tag=>{
         tag=$tag=='' ? null : $tag; return ''
      })
      let attribs=this.getAttributes(element)
      element={ query }
      if (id) element.id=id
      if (tag) element.tag=tag
      if (classList.length>0) element.classList=classList
      if (attribs.length>0) element.attribs=attribs
      return element
   }
    getAttributes(element){
      let attribs=this.stringValues.filter((value,index)=>{
         let searchValue=`[${index}]`
         if (element.match(searchValue)) return true
         else return false
      })
      attribs=attribs.map(attrib=>{
         let query=attrib
         attrib=attrib.replace('[','').replace(']','')
         let [name,...values]=attrib.split('=')
         const value=values.join('=').trim().replace(/^\"/,'').replace(/\"$/,'')
         let sign
         attrib={query,name}
         if(value){
            sign='='
            attrib.name=attrib.name.replace(/[\~\|\^\$\*]$/,(match=>{
               sign=match+sign
               return ''
            }))
            attrib.value=value
         }
         if (sign){
            attrib.sign=sign
            attrib.check=this.getAttribFn(sign).bind(attrib)
         }
         return attrib
      });
      return attribs
   }
    getAttribFn(sign){
      if (sign=='=') return function (value){ return value===this.value }
      if (sign=='*=') return function (value){ return value.includes(this.value) }
      if (sign=='^=') return function (value){ return value.startsWith(this.value) }
      if (sign=='$=') return function (value){ return value.endsWith(this.value) }
      if (sign=='|=') return function (value){
         return value.trim().split(' ').length==1
            && (value.startsWith(this.value) || value.startsWith(this.value+'-'))
            ? true : false
      }
      if (sign=='~=') return function (value){
         return this.value.trim().split(' ').length==1 && value.includes(this.value) ? true : false
      }
   }
    removeSpaces(selector){
      selector=selector.replace(/\s{2}/g,' ')
      selector=selector.replace(/\s?\^?\$?\|?\~?\*?\=\s*/g,(m)=>m.trim())
      selector=selector.replace(/\s?(\+|\~|\>)\s?/g,(m)=>m.trim())
      return selector
   }
}
function checkElement(el,selector){
   if(selector==undefined) return true
   if(el==null) return false
   let{tag,classList,attribs:attributes,id,prev,ancestors,parents,prevAny}=selector
   if(typeof el==='string') return false
   if(id!==undefined && el.id===null) return false
   if(id && id!==el.id) return false
   if(tag && el._tagName===undefined) return false
   else if(tag && tag!==el._tagName) return false
   const clas=el.attributes.class
   if(classList!==undefined && (clas===undefined || clas==='')) return false
   else if(classList!==undefined){
      if(classList.every(e=>el.classList.contains(e))===false) return false
   }
   if(checkattributes(attributes,el)===false) return false
   if(checkElement(el.prev,prev)===false) return false
   if(checkAncestors(el.ancestors,ancestors)===false) return false
   if(checkParents(el.ancestors,parents)===false) return false
   if(el.parent){
      if(checkPrevAny(el.parent.children,el.childIndex,prevAny)==false) return false
   }
   return true
}
  function checkattributes(attributes=[],el){
   let elattributes=el.attributes
   let names=Object.keys(elattributes)
   let passedTests=0
   if(attributes) for(let i=0; i<attributes.length; i++){
      let{name,value,check}=attributes[i]
      if(name=='inner' && value!==undefined && check && el.inner){
         if(check(el.inner)) passedTests++
      }
       if(!names.includes(name)) continue
      else if(value==undefined) passedTests++
      else if(value && elattributes[name]){
         if(check(elattributes[name])==false) continue
         else passedTests++
      }
   }
   if(passedTests==attributes.length) return true
   else return false
}
  function checkPrevAny(children=[],index,prevAny){
   let size=children.length
   if((size==0 || index==0) && prevAny) return false
   for(let i=index; i>=0; i--){
      if(checkElement(children[i],prevAny)) return true
   }
   return false
}
  function checkAncestors(ancestors=[],selectorAncestors=[]){
   let count=0
   if(selectorAncestors.length==0) return true
   let endIndex=ancestors.length-1
   let selectorIndex=selectorAncestors.length-1
   while(selectorIndex>=0){
      for(let i=endIndex; i>=0; i--){
         endIndex=i-1
         if(checkElement(ancestors[i],selectorAncestors[selectorIndex])==true){
            count++
            break
         }
      }
      selectorIndex--
   }
   if(count==selectorAncestors.length) return true
   else return false
}
  function checkParents(ancestors=[],selectorParents=[]){
   if(selectorParents.length===0) return true
   if(ancestors.length< selectorParents.length) return false
   let index=ancestors.length-1
   for(let i=selectorParents.length-1; i>=0; i--){
      if(checkElement(ancestors[index],selectorParents[i])===false) return false
      index--
   }
   return true
}
const getDataName=prop=>'data-'+prop.toLowerCase()
function getDataset(element){
   return new Proxy(element.attributes,{
       get: (target,prop)=>{return target[getDataName(prop)]},set: (target,prop,value)=>{target[getDataName(prop)]=value; return true},deleteProperty: (target,prop)=>{
           const dataAttr=getDataName(prop)
           if (dataAttr in target){
               delete target[dataAttr];
               return true;
           }
           return false;
       }
   });
}

function find(selectors,element,collection,first=false,firstTime=true){
   if(!firstTime)
   for(let selector of selectors){
      if(checkElement(element,selector)) collection.add(element)
   }
   if(element.children)
   element.children.forEach(child=>{
      if(first && collection.size>0) return
      find(selectors,child,collection,first,false)
   })
    return firstTime ? [...collection] : collection
}
class TextNode{
   constructor(data){
      this.nodeName='#text';
      this.parent=null;
      this.textContent=data;
   }
   get nodeValue(){return this.textContent}
   get parentNode(){return this.parent}
}

function buildStyle(attributes){
   const styles=attributes.style || "";
    const camelToKebab=str=>str.replace(/([a-z0-9]|(?=[A-Z]))([A-Z])/g,'$1-$2').toLowerCase();
   const kebabToCamel=str=>str.replace(/-([a-z])/g,g=>g[1].toUpperCase());
    const baseStyleObj=styles.split(";").reduce((acc,style)=>{
      const [key,value]=style.split(":").map(s=>s.trim());
      if (key && value) acc[kebabToCamel(key)]=value;
      return acc;
   },{});
    return new Proxy(baseStyleObj,{
      get: (obj,prop)=>obj[camelToKebab(prop)] || obj[prop],set: (obj,prop,value)=>{
         obj[camelToKebab(prop)]=value;
         attributes.style=Object.entries(obj).map(([k,v])=>`${camelToKebab(k)}: ${v}`).join("; ");
         return true;
      },deleteProperty: (obj,prop)=>{
         delete obj[camelToKebab(prop)];
         attributes.style=Object.entries(obj).map(([k,v])=>`${camelToKebab(k)}: ${v}`).join("; ");
         return true;
      }
   });
}

class NodeClassList{
   constructor(node){ this.node=node }
   get classes(){ return (this.node.attributes.class || "").split(" ").filter(Boolean) }
   set classes(val){ this.node.attributes.class=val.join(" ") }
   contains(className){ return this.classes.includes(className) }
    add(className){
      const currentClasses=this.classes;
      if (!currentClasses.includes(className)) this.classes=[...currentClasses,className];
   }
    remove(className){ this.classes=this.classes.filter(cls=>cls!==className); }
    toggle(className){
      if (this.classes.includes(className)) this.remove(className);
      else this.add(className);
   }
    replace(oldClass,newClass){
      if (this.classes.includes(oldClass)){
         this.remove(oldClass);
         this.add(newClass);
      }
   }
}
function insertBefore(arr,index,newItem){
   const existingIndex=arr.indexOf(newItem);
   if (existingIndex!==-1) arr.splice(existingIndex,1);
   arr.splice(index,0,newItem);
}
  class Node{
   constructor(tagName,attributes={},parent=null){
      this.isSingle=false;
      this._tagName=tagName.toLowerCase();
      this.tagName=tagName.toUpperCase();
      this.attributes=attributes;
      this.childNodes=[];
      if (parent!==null) parent.childNodes.push(this)
      this.parent=parent;
      this._classList=null;
      this.__style=null;
      this._dataset=null
   }
    get id(){ return this.attributes.id ? this.attributes.id : null; }
   set id(newValue){ this.attributes.id=newValue; }
   get className(){ return this.attributes.class || null }
   get parentNode(){ return this.parent }
   get ancestors(){
      if (!this.parent) return []
      const ancestors=[]
      let element=this.parent
      while (element.tagName!=='ROOT'){
         ancestors.push(element)
         element=element.parent
      }
      return ancestors.reverse()
   }
    get childNodeIndex(){
      if (!this.parent) return null
      return this.parent.childNodes ? this.parent.childNodes.indexOf(this) : null
   }
    get childIndex(){
      if (!this.parent) return null
      return this.parent.children ? this.parent.children.indexOf(this) : null
   }
   get previousElementSibling(){ return this.prev }
   get prev(){
      if (this.childIndex===null) return null
      return this.parent.children[this.childIndex-1]
   }
    get nextElementSibling(){ return this.next }
   get next(){
      if (this.childIndex===null) return null
      return this.parent.children[this.childIndex+1] || null
   }
    get dataset(){
      if (!this._dataset) this._dataset=getDataset(this);
      return this._dataset;
   }
    get classList(){
      if (!this._classList) this._classList=new NodeClassList(this);
      return this._classList;
   }
    get style(){
      if (!this.__style) this.__style=buildStyle(this.attributes)
      return this.__style
   }
    get outerHTML(){
      const attrs=Object.entries(this.attributes).map(([key,val])=>val.length ? `${key}="${val}"` : key).join(" ");
      return `<${this._tagName}${attrs ? ' '+attrs : ''}>${this.innerHTML}</${this._tagName}>`;
   }
    getAttribute(attrName){ return this.attributes[attrName]!==undefined ? this.attributes[attrName] : null }
   setAttribute(attrName,value=''){ this.attributes[attrName]=value }
   removeAttribute(attrName){ delete this.attributes[attrName] }
    remove(){
      if (!this.parent) return
      const index=this.childNodeIndex;
      if (index!==null) this.parent.childNodes.splice(index,1);
   }
    get innerHTML(){
      return this.childNodes.map(child=>{
         if (child instanceof Node || child instanceof SingleNode) return child.outerHTML;
         else if (child instanceof TextNode) return child.textContent;
         else return child
      }).join("");
   }
    get innerText(){
      return this.childNodes.map(child=>{
         if (child instanceof Node || child instanceof SingleNode) return child.innerText;
         else if (child instanceof TextNode) return child.textContent;
         else return child
      }).join("");
   }
    set innerText(value){
      this.childNodes=[new TextNode(value)]
      return value
   }
    $$(query){ return this.querySelectorAll(query) }
   querySelectorAll(query){
      const selectors=Query.get(query)
      return find(selectors,this,new Set())
   }
   $(query){ return this.querySelector(query) }
   querySelector(query){
      const selectors=Query.get(query)
      return find(selectors,this,new Set(),true)[0] || null
   }
    getElementsByClassName(query){ return this.querySelectorAll('.'+query) }
   getElementsByTagName(query){ return this.querySelectorAll(query) }
   getElementById(query){ return this.querySelector('#'+query) }
    get children(){
      return this.childNodes.filter(child=>{
         if (!(child instanceof Node)) return false
         if (child._tagName==='#comment') return false
         return true
      });
   }
    insertAdjacentElement(position,newElement){
      if (newElement.tagName==='ROOT' && newElement.childNodes.length>0) newElement=newElement.childNodes[0]
      const pos=position.toLowerCase();
      if(newElement.parentNode){
         newElement.parentNode.childNodes=newElement.parentNode.childNodes.filter(el=>el!==newElement)
      }
      if (pos==='afterbegin' || pos==='beforeend'){
         if (pos==="afterbegin") this.childNodes.unshift(newElement);
         else if (pos==="beforeend") this.childNodes.push(newElement);
         newElement.parent=this
         return newElement
      }
      if (!this.parent) throw new Error("Can't insert element to element without parent")
      if (pos==="beforebegin") insertBefore(this.parent.childNodes,this.childNodeIndex,newElement)
      else if (pos==="afterend") this.parent.childNodes.splice(this.childNodeIndex+1,0,newElement);
      newElement.parent=this.parent
      return newElement
   }
    insertAdjacentHTML(position,html){
      const newNode=parseHTML(html);
      newNode.childNodes.forEach(node=>{
         this.insertAdjacentElement(position,node);
      });
      return newNode
   }
    insertAdjacentText(position,text){
      return this.insertAdjacentElement(position,new TextNode(text));
   }
    insert(position,element){
      const positions=['beforebegin','afterbegin','beforeend','afterend']
      if (positions[position]) position=positions[position]
      if (typeof element==='string'){
         element=element.trim()
         if (element.startsWith('<') && element.endsWith('>')){
            return this.insertAdjacentHTML(position,element)
         }
         return this.insertAdjacentText(position,element)
      }
      return this.insertAdjacentElement(position,element)
   }
    set innerHTML(html){
      this.childNodes=html.trim().startsWith('<') ? parseHTML(html).childNodes : [html]
      this.children.forEach(child=>child.parent=this);
   }
   set outerHTML(html){
      const parsed=parseHTML(html);
      if (!this.parent) throw new Error('element has no parent node')
      const index=this.childIndex
      if (index!==null) this.parent.childNodes.splice(index,1,...parsed.childNodes);
   }
    appendChild(newChild){
      if (newChild instanceof Node || newChild instanceof TextNode || newChild instanceof SingleNode){
         if (newChild.parent) newChild.parent.childNodes=newChild.parent.childNodes.filter(child=>child!==newChild);
      } else if (typeof newChild==='string') newChild=new TextNode(newChild)
      else return newChild
      this.childNodes.push(newChild);
      newChild.parent=this;
      return newChild;
   }
    get textContent(){
      if (this.childNodes.length===0) return this.nodeName==='#text' ? this.nodeValue : '';
      return this.childNodes.map(child=>{
         if (child instanceof SingleNode) return ''
         if (child instanceof TextNode) return child.nodeValue
         if (child instanceof Node) return child.textContent;
         else return child;
      }).join('');
   }
    set textContent(value){
      this.childNodes=[];
      if (value!==null && value!==undefined){
         this.childNodes.push(value.toString());
      }
   }
}
class SingleNode extends Node{
   constructor(tagName,attributes={},parent=null){
      if(attributes['?'] && tagName==='?xml') delete attributes['?']
      super(tagName,attributes,parent);
      this.isSingle=true
   }
    get outerHTML(){
      if (this._tagName==="#cdata-section") return `<![CDATA[${this.nodeValue}]]>`;
      const attrs=Object.entries(this.attributes).map(([key,val])=>val.length ? `${key}="${val}"` : key).join(" ");
      return `<${this._tagName} ${attrs}${this._tagName==='?xml' ? '?' : ''}>`;
   }
    get innerHTML(){ return ""; }
   set innerHTML(_){ }
   $(_){return null}
   $$(_){return []}
   querySelectorAll(_){ return []; }
   querySelector(_){ return null; }
   getElementsByClassName(_){ return []; }
   getElementsByTagName(_){ return []; }
   getElementById(_){ return null; }
   get children(){ return []; }
    insertAdjacentElement(position,newElement){
      if(position==='afterbegin') position='beforebegin'
      if(position==='beforeend') position='afterend'
      return super.insertAdjacentElement(position,newElement)
   }
   insertAdjacentHTML(position,html){
      if(position==='afterbegin') position='beforebegin'
      if(position==='beforeend') position='afterend'
      return super.insertAdjacentHTML(position,html)
   }
   insertAdjacentText(position,text){
      if(position==='afterbegin') position='beforebegin'
      if(position==='beforeend') position='afterend'
      return super.insertAdjacentText(position,text)
   }
   insert(position,element){
      if(position===1) position=0
      if(position===2) position=3
      return super.insert(position,element)
   }
    appendChild(_){ }
   get textContent(){ return ""; }
   set textContent(_){ }
}

class Root extends Node{
   constructor(){
      super('ROOT',{},null);
      this.isSingle=false
   }
}
class Document extends Node{
   constructor(html,url){
      super('ROOT',{},null);
      this.isSingle=false
      this.URL=url
      if(html instanceof Document) this.childNodes=[...buildFromCache(cacheDoc(html)).childNodes]
      else if(typeof html==='string') this.innerHTML=html
      else this.html
   }
    get documentElement(){return this.html}
   get html(){
      const html=this.$('html')
      if(html===null) this.innerHTML=/*html*/`<html lang="en"><head><meta charset="UTF-8"><title></title></head><body></body></html>`
      return this.$('html')
   }
    get innerHTML(){
      const inner=super.innerHTML
      return '<!DOCTYPE html>'+inner
   }
   set innerHTML(html){return super.innerHTML=html}
    get head(){
      const head=this.html.$('head')
      if(head===null) this.html.insert(1,'<head></head>')
      return this.$('head')
   }
    get body(){
      const body=this.html.$('body')
      if(body===null) this.head.insert(3,'<body></body>')
      return this.$('body')
   }
    get title(){
      const title=this.head.$('title')
      if(title===null) this.head.insert(1,'<title></title>')
      return this.$('title').innerText
   }
    get charset(){return this.$('meta[charset]')}
    set title(title){return this.head.$('title').innerText=title}
    get clone(){return new Document(this)}
}
function parseAttributes(str){
   const attrs={};
   let key="";
   let value="";
   let isKey=true;
   let quoteChar=null;
    for (let i=0; i< str.length; i++){
      const char=str[i];
       if (isKey && (char==='=' || char===' ')){
         if (char==='=') isKey=false;
         else if (key.trim()){
            attrs[key.trim()]=true;
            key="";
         }
         continue;
      }
       if (!quoteChar && (char==='"' || char==="'")){
         quoteChar=char;
         continue;
      } else if (quoteChar && char===quoteChar){
         quoteChar=null;
         attrs[key.trim()]=value.trim();
         key=""; value=""; isKey=true;
         continue;
      }
       if (isKey) key+=char;
      else value+=char;
   }
    if (key.trim() &&!value) attrs[key.trim()]='';
   return attrs;
}
const VOID_TAGS=new Set(["area","base","br","col","command","embed","hr","img","input","keygen","link","meta","param","source","track","wbr","!doctype",'?xml']);
function parseHTML(html){
   const root=new Root();
   const stack=[root];
   let currentText="",i=0;
   let max=0
    function parseScript(){
      if (!html.startsWith("<script",i)) return false;
      const openTagEnd=html.indexOf(">",i);
      if (openTagEnd===-1) return false;
       const attributesString=html.substring(i+7,openTagEnd).trim();
      const attributes=parseAttributes(attributesString);
       let closeTagStart=html.indexOf("</script>",openTagEnd);
      if (closeTagStart===-1) return false;
      const content=html.substring(openTagEnd+1,closeTagStart);
       const scriptNode=new Node('script',attributes,stack[stack.length-1]);
      if(content.length>0) scriptNode.childNodes.push(content);
         i=closeTagStart+9;
      return true;
   }
    function parseSpecial(startStr,endStr,n1,n2,tag){
      if (!html.startsWith(startStr,i)) return false
      if(currentText.length) stack[stack.length-1].childNodes.push(new TextNode(currentText));
      const end=html.indexOf(endStr,i+n1);
      const strNode=new Node(tag,{},stack[stack.length-1]);
      strNode.childNodes.push(html.substring(i+n1,end));
      i=end+n2;
      return true
   }
    while (i< html.length){
      if(i>=max) max=i;
      else break;
      if (parseScript()) continue
      if (parseSpecial("<!--","-->",4,3,'#comment')) continue
      if (parseSpecial("<style","</style>",7,8,'style')) continue
       if (html.startsWith("<![CDATA[",i)){
         const end=html.indexOf("]]>",i+9);
         if (end===-1) break;
         const content=html.substring(i+9,end);
         const cdataNode=new SingleNode("#cdata-section",{},stack[stack.length-1]);
         cdataNode.nodeValue=content;
         i=end+3;
         continue;
      }
       if (html.startsWith("<",i)){
         if (currentText && stack[stack.length-1]){
            const textNode=new TextNode(currentText)
            stack[stack.length-1].childNodes.push(textNode);
            textNode.parent=stack[stack.length-1]
            currentText="";
         }
          let tagEnd=i+1;
         let insideQuotes=false;
         let quoteChar=null;
          while (tagEnd< html.length){
            const char=html[tagEnd];
            if (!insideQuotes && (char==='"' || char==="'")){
               insideQuotes=true;
               quoteChar=char;
            } else if (insideQuotes && char===quoteChar){
               insideQuotes=false;
               quoteChar=null;
            }
             if (!insideQuotes && char==='>') break;
            tagEnd++;
         }
          const tagContent=html.substring(i+1,tagEnd);
         if (tagContent.startsWith("/")) stack.pop();
         else{
            let isSelfClosing=tagContent.endsWith('/');
            const tagNameEnd=tagContent.search(/\s|>|\//);
            const tagName=tagContent.substring(0,tagNameEnd>0 ? tagNameEnd : tagEnd-i-1);
            const attributesString=tagContent.substring(tagName.length,isSelfClosing ? tagContent.length-1 : tagContent.length).trim();
            const attributes=parseAttributes(attributesString);
            if (VOID_TAGS.has(tagName.toLowerCase()) || isSelfClosing) new SingleNode(tagName,attributes,stack[stack.length-1])
            else stack.push(new Node(tagName,attributes,stack[stack.length-1]));
         }
         i=tagEnd+1;
      } else{
         currentText+=html[i];
         i++;
      }
   }
   if (currentText.trim() && stack[stack.length-1]) stack[stack.length-1].childNodes.push(new TextNode(currentText));
   return root;
}
function buildFromCache(cached){
   function buildNode(cache,parent=null){
      if(typeof cache==='string') return parent.childNodes.push(cache)
      const{isSingle,tagName,attributes,childNodes,textContent}=cache
      if(textContent) return parent.childNodes.push(new TextNode(textContent))
      if(isSingle && parent) return parent.childNodes.push(new SingleNode(tagName,attributes))
      const newDoc=tagName==='ROOT' ? new Root() : new Node(tagName,attributes,parent)
      childNodes.forEach(childNode=>{
         buildNode(childNode,newDoc)
      });
      return newDoc
   }
   return buildNode(cached)
}
  
function cacheDoc(doc){
   const props=['isSingle','tagName','attributes']
   function addToCache(element,cache={}){
      if(typeof element==='string') return element
      if(element.nodeName==='#text') return{textContent:element.textContent}
      props.forEach(prop=>{
         if(element[prop]){
            cache[prop]=typeof element[prop]==='object' ?{...element[prop]} : element[prop]
         }
      });
      if(!element.childNodes) return cache
      cache.childNodes=[]
      element.childNodes.forEach(childNode=>{
         cache.childNodes.push(addToCache(childNode))
      });
      return cache
   }
   return addToCache(doc)
}
return { parseHTML,Node,Query,TextNode,SingleNode,buildFromCache,cacheDoc,Root,Document }
})()
const { Document, SingleNode, Node } = alsDocument
class Layout extends Document {
   constructor(html, host) { super(html, host); this.root = this.html; }
   get rawHtml() { return this.innerHTML }
   get clone() { return new this.constructor(new Document(this, this.URL), this.host) }
   lang(lang) { this.html.setAttribute('lang', lang); return this }
   link(href, attributes = { rel: "stylesheet", type: "text/css" }) {
      if (!href || typeof href !== 'string') throw new Error(`href attribute must be a string`)
      if (!this.root.querySelector(`link[rel=stylesheet][href^="${href}"]`)) 
         this.head.insert(2, new SingleNode('link', { href, ...attributes }))
      return this
   }
   keywords(keywords = []) {
      let el = this.root.$('meta[name=keywords]') || new SingleNode('meta', { name: 'keywords' })
      keywords = new Set([...(el.getAttribute('content') || '').split(','),...keywords.map(k => k.trim())].filter(Boolean))
      if (keywords.size) el.setAttribute('content', Array.from(keywords).join(','))
      if(keywords.size && !el.parent) this.head.insert(2, el)
      return this
   }
   style(styles) {
      if (typeof styles !== 'string') throw 'styles parameter should be string';
      let el = this.root.$('style') || this.head.insert(2, new Node('style'))
      el.innerHTML = el.innerHTML + '\n' + styles;
      return this
   }
   url(url, host = this.URL) {
      try {
         url = (host ? new URL(url, host) : new URL(url)).href.replace(/\/$/, '')
         this.meta({ property: 'og:url', content: url })
         const el = this.root.$('link[rel="canonical"]') || this.head.insert(2, new SingleNode('link', { rel: 'canonical', href: url }))
         el.setAttribute('href', url)
      } catch (error) { error.info = `url "${url}" with host "${host}" is not valid url`; throw error; }
      return this
   }
   meta(props) {
      const entries = Object.entries(props)
      const [name, value] = entries[0]
      const metaElement = this.root.querySelector(`meta[${name}="${value}"]`) || this.head.insert(2, new SingleNode('meta', props))
      entries.forEach(([name, v]) => metaElement.setAttribute(name, props[name]))
      return this
   }
   script(attrs = {}, innerHTML = '', head = true) {
      if (typeof attrs !== 'object' || attrs === null || Array.isArray(attrs)) attrs = {}
      if (attrs.src && this.root.querySelector(`script[src="${attrs.src}"]`)) return this
      if (Object.keys(attrs).length || innerHTML) {
         const script = new Node('script', attrs)
         if (innerHTML) script.innerHTML = innerHTML
         if (head) this.head.insert(2, script)
         else this.html.insert(2, script)
      }
      return this
   }
   description(description) {
      this.meta({ name: 'description', content: description })
      this.meta({ property: 'og:description', content: description })
      this.meta({ property: 'twitter:description', content: description })
      return this
   }
   favicon(href) {
      const el = this.root.$('link[rel=icon][type=image/x-icon]')
      if (el) el.setAttribute('href', href)
      else this.head.insert(2, new SingleNode('link', { rel: 'icon', href, type: 'image/x-icon' }))
      return this
   }
   viewport(viewport = 'width=device-width, initial-scale=1.0') {
      const el = this.root.$('meta[name="viewport"]')
      if (el) el.setAttribute('content', viewport)
      else this.head.insert(2, new SingleNode('meta', { name: 'viewport', content: viewport }))
      return this
   }
   image(image) {
      this.meta({ property: 'og:image', content: image })
      this.meta({ name: 'twitter:image', content: image })
      this.meta({ name: 'twitter:card', content: 'summary_large_image' })
      return this
   }
   title(title) {
      super.title // create title tag if not exists
      super.title = title
      this.meta({ property: 'og:title', content: title })
      return this
   }
}