Add BuilderElement and lang

src/file/xml-components/default-attributes.ts

@@ -3,14 +3,20 @@ import { IXmlableObject } from "./xmlable-object";
 
 export type AttributeMap<T> = { readonly [P in keyof T]: string };
 
+export type AttributeData = { readonly [key: string]: boolean | number | string };
+export type AttributePayload<T extends AttributeData> = Record<
+    keyof T,
+    {
+        readonly key: string;
+        readonly value?: T[keyof T];
+    }
+>;
+
 export abstract class XmlAttributeComponent<T extends object> extends BaseXmlComponent {
-    // tslint:disable-next-line:readonly-keyword
-    protected readonly root: T;
     protected readonly xmlKeys?: AttributeMap<T>;
 
-    public constructor(properties: T) {
+    public constructor(private readonly root: T) {
         super("_attr");
-        this.root = properties;
     }
 
     public prepForXml(_: IContext): IXmlableObject {
@@ -26,3 +32,20 @@ export abstract class XmlAttributeComponent<T extends object> extends BaseXmlCom
         return { _attr: attrs };
     }
 }
+
+export class NextAttributeComponent<T extends AttributeData> extends BaseXmlComponent {
+    public constructor(private readonly root: AttributePayload<T>) {
+        super("_attr");
+    }
+
+    public prepForXml(_: IContext): IXmlableObject {
+        const attrs = {};
+        Object.values(this.root).forEach(({ key, value }) => {
+            if (value !== undefined) {
+                // eslint-disable-next-line functional/immutable-data
+                attrs[key] = value;
+            }
+        });
+        return { _attr: attrs };
+    }
+}