url: use a class for WHATWG url[context]

The object is used as a structure, not as a map, which `StorageObject` was designed for. PR-URL: #12507 Reviewed-By: James M Snell <[email protected]>

Author: TimothyGu

lib/internal/url.js

@@ -3,8 +3,7 @@
 constutil=require('util');
 const{
  hexTable,
- isHexTable,
- StorageObject
+ isHexTable
 }=require('internal/querystring');
 constbinding=process.binding('url');
 constcontext=Symbol('context');
@@ -97,6 +96,26 @@ class TupleOrigin{
 }
 }
 
+// This class provides the internal state of a URL object. An instance of this
+// class is stored in every URL object and is accessed internally by setters
+// and getters. It roughly corresponds to the concept of a URL record in the
+// URL Standard, with a few differences. It is also the object transported to
+// the C++ binding.
+// Refs: https://url.spec.whatwg.org/#concept-url
+classURLContext{
+constructor(){
+this.flags=0;
+this.scheme=undefined;
+this.username=undefined;
+this.password=undefined;
+this.host=undefined;
+this.port=undefined;
+this.path=[];
+this.query=undefined;
+this.fragment=undefined;
+}
+}
+
 functiononParseComplete(flags,protocol,username,password,
 host,port,path,query,fragment){
 varctx=this[context];
@@ -125,7 +144,7 @@ function onParseError(flags, input){
 // Reused by URL constructor and URL#href setter.
 functionparse(url,input,base){
 constbase_context=base ? base[context] : undefined;
-url[context]=newStorageObject();
+url[context]=newURLContext();
 binding.parse(input.trim(),-1,
 base_context,undefined,
 onParseComplete.bind(url),onParseError);