implemented xml type for new event system

src/Type/YMap.js

@@ -3,6 +3,11 @@ import Item from '../Struct/Item.js'
 import ItemJSON from '../Struct/ItemJSON.js'
 
 export default class YMap extends Type {
+  _callObserver (parentSub) {
+    this._eventHandler.callEventListeners({
+      name: parentSub
+    })
+  }
   toJSON () {
     const map = {}
     for (let [key, item] of this._map) {
@@ -22,22 +27,40 @@ export default class YMap extends Type {
     }
     return map
   }
+  delete (key) {
+    this._y.transact(() => {
+      let c = this._map.get(key)
+      if (c !== undefined) {
+        c._delete(this._y)
+      }
+    })
+  }
   set (key, value) {
-    let old = this._map.get(key)
-    let v
-    if (value instanceof Item) {
-      v = value
-    } else {
-      let v = new ItemJSON()
-      v._content = JSON.stringify(value)
-    }
-    v._right = old
-    v._parent = this
-    v._parentSub = key
-    v._integrate()
+    this._y.transact(() => {
+      const old = this._map.get(key) || null
+      if (old !== null) {
+        old._delete(this._y)
+      }
+      let v
+      if (value instanceof Item) {
+        v = value
+      } else {
+        v = new ItemJSON()
+        v._content = [value]
+      }
+      v._right = old
+      v._right_origin = old
+      v._parent = this
+      v._parentSub = key
+      v._integrate(this._y)
+    })
+    return value
   }
   get (key) {
     let v = this._map.get(key)
+    if (v === undefined || v._deleted) {
+      return undefined
+    }
     if (v instanceof Type) {
       return v
     } else {