initial auto complete wrapper, make existing autocompleter work w/ model

src/editor/autocomplete.js

@@ -0,0 +1,93 @@
+/*
+Copyright 2019 New Vector Ltd
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+import {UserPillPart, RoomPillPart, PlainPart} from "./parts";
+
+export default class AutocompleteWrapperModel {
+    constructor(updateCallback, getAutocompleterComponent, updateQuery) {
+        this._updateCallback = updateCallback;
+        this._getAutocompleterComponent = getAutocompleterComponent;
+        this._updateQuery = updateQuery;
+        this._query = null;
+    }
+
+    onEscape(e) {
+        this._getAutocompleterComponent().onEscape(e);
+    }
+
+    onEnter() {
+
+    }
+
+    onTab() {
+        //forceCompletion here?
+    }
+
+    onUpArrow() {
+        console.log("onUpArrow");
+        this._getAutocompleterComponent().onUpArrow();
+    }
+
+    onDownArrow() {
+        console.log("onDownArrow");
+        this._getAutocompleterComponent().onDownArrow();
+    }
+
+    onPartUpdate(part, offset) {
+        // cache the typed value and caret here
+        // so we can restore it in onComponentSelectionChange when the value is undefined (meaning it should be the typed text)
+        this._queryPart = part;
+        this._queryOffset = offset;
+        this._updateQuery(part.text);
+    }
+
+    onComponentSelectionChange(completion) {
+        if (!completion) {
+            this._updateCallback({
+                replacePart: this._queryPart,
+                replaceCaret: this._queryOffset,
+            });
+        } else {
+            this._updateCallback({
+                replacePart: this._partForCompletion(completion),
+            });
+        }
+    }
+
+    onComponentConfirm(completion) {
+        this._updateCallback({
+            replacePart: this._partForCompletion(completion),
+            close: true,
+        });
+    }
+
+    _partForCompletion(completion) {
+        const firstChr = completion.completionId && completion.completionId[0];
+        switch (firstChr) {
+            case "@": {
+                const displayName = completion.completion;
+                const userId = completion.completionId;
+                return new UserPillPart(userId, displayName);
+            }
+            case "#": {
+                const displayAlias = completion.completionId;
+                return new RoomPillPart(displayAlias);
+            }
+            default:
+                return new PlainPart(completion.completion);
+        }
+    }
+}