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

src/scripting_api/aform.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 AForm {
+  constructor(document, app, util) {
+    this._document = document;
+    this._app = app;
+    this._util = util;
+  }
+
+  AFNumber_Format(
+    nDec,
+    sepStyle,
+    negStyle,
+    currStyle,
+    strCurrency,
+    bCurrencyPrepend
+  ) {
+    const event = this._document._event;
+    if (!event.value) {
+      return;
+    }
+
+    nDec = Math.abs(nDec);
+    const value = event.value.trim().replace(",", ".");
+    let number = Number.parseFloat(value);
+    if (isNaN(number) || !isFinite(number)) {
+      number = 0;
+    }
+    event.value = number.toFixed(nDec);
+  }
+}
+
+export { AForm };