start rewriting y-richtext

src/Struct/ItemFormat.js

@@ -0,0 +1,45 @@
+import { default as Item } from './Item.js'
+import { logID } from '../MessageHandler/messageToString.js'
+
+export default class ItemString extends Item {
+  constructor () {
+    super()
+    this.key = null
+    this.value = null
+  }
+  _copy (undeleteChildren, copyPosition) {
+    let struct = super._copy(undeleteChildren, copyPosition)
+    struct.key = this.key
+    struct.value = this.value
+    return struct
+  }
+  get _length () {
+    return 1
+  }
+  get _countable () {
+    return false
+  }
+  _fromBinary (y, decoder) {
+    let missing = super._fromBinary(y, decoder)
+    this.key = decoder.readVarString()
+    this.value = decoder.readVarString()
+    return missing
+  }
+  _toBinary (encoder) {
+    super._toBinary(encoder)
+    encoder.writeVarString(this.key)
+    encoder.writeVarString(this.value)
+  }
+  _logString () {
+    const left = this._left !== null ? this._left._lastId : null
+    const origin = this._origin !== null ? this._origin._lastId : null
+    return `ItemFormat(id:${logID(this._id)},key:${JSON.stringify(this.key)},value:${JSON.stringify(this.value)},left:${logID(left)},origin:${logID(origin)},right:${logID(this._right)},parent:${logID(this._parent)},parentSub:${this._parentSub})`
+  }
+  _splitAt (y, diff) {
+    if (diff === 0) {
+      return this
+    } else {
+      return this._right
+    }
+  }
+}