JS - Add the basic architecture to be able to execute embedded js

src/scripting_api/event.js

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+/* Copyright 2020 Mozilla Foundation
+ *
+ * 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.
+ */
+
+class Event {
+  constructor(data) {
+    this.change = data.change || "";
+    this.changeEx = data.changeEx || null;
+    this.commitKey = data.commitKey || 0;
+    this.fieldFull = data.fieldFull || false;
+    this.keyDown = data.keyDown || false;
+    this.modifier = data.modifier || false;
+    this.name = data.name;
+    this.rc = true;
+    this.richChange = data.richChange || [];
+    this.richChangeEx = data.richChangeEx || [];
+    this.richValue = data.richValue || [];
+    this.selEnd = data.selEnd || 0;
+    this.selStart = data.selStart || 0;
+    this.shift = data.shift || false;
+    this.source = data.source || null;
+    this.target = data.target || null;
+    this.targetName = data.targetName || "";
+    this.type = "Field";
+    this.value = data.value || null;
+    this.willCommit = data.willCommit || false;
+  }
+}
+
+class EventDispatcher {
+  constructor(document, calculationOrder, objects) {
+    this._document = document;
+    this._calculationOrder = calculationOrder;
+    this._objects = objects;
+
+    this._document.obj._eventDispatcher = this;
+  }
+
+  dispatch(baseEvent) {
+    const id = baseEvent.id;
+    if (!(id in this._objects)) {
+      return;
+    }
+
+    const name = baseEvent.name.replace(" ", "");
+    const source = this._objects[id];
+    const event = (this._document.obj._event = new Event(baseEvent));
+    const oldValue = source.obj.value;
+
+    this.runActions(source, source, event, name);
+    if (event.rc && oldValue !== event.value) {
+      source.wrapped.value = event.value;
+    }
+  }
+
+  runActions(source, target, event, eventName) {
+    event.source = source.wrapped;
+    event.target = target.wrapped;
+    event.name = eventName;
+    event.rc = true;
+    if (!target.obj._runActions(event)) {
+      return true;
+    }
+    return event.rc;
+  }
+}
+
+export { Event, EventDispatcher };