made attributes able to be replaced

ts/docx/xml-components/index.ts

@@ -1,3 +1,5 @@
+import * as _ from "lodash";
+
 export abstract class BaseXmlComponent {
     protected rootKey: string;
 
@@ -44,6 +46,28 @@ export abstract class XmlUnitComponent extends BaseXmlComponent {
     }
 }
 
+export abstract class XmlAttributeComponent extends BaseXmlComponent {
+    protected root: Object;
+    private xmlKeys: Object;
+
+    constructor(xmlKeys: Object) {
+        super("_attr");
+        this.xmlKeys = xmlKeys;
+    }
+
+    replaceKey(): void {
+        if (this.root !== undefined) {
+            _.forOwn(this.root, (value, key) => {
+                var newKey = this.xmlKeys[key];
+                this.root[newKey] = value;
+                delete this.root[key];
+            });
+            this[this.rootKey] = this.root;
+            delete this.root;
+        }
+    }
+}
+
 interface AttributesProperties {
     val?: any;
     color?: string;
@@ -65,10 +89,10 @@ interface AttributesProperties {
     linePitch?: string;
 }
 
-export class Attributes extends XmlComponent {
+export class Attributes extends XmlAttributeComponent {
-    private _attr: Object;
 
-    xmlKeys = {
+    constructor(properties?: AttributesProperties) {
+        super({
             val: "w:val",
             color: "w:color",
             space: "w:space",
@@ -87,17 +111,12 @@ export class Attributes extends XmlComponent {
             footer: "w:footer",
             gutter: "w:gutter",
             linePitch: "w:linePitch"
-    };
+        });
-
+        this.root = properties
-    constructor(properties?: AttributesProperties) {
-        super("_attr");
-        this._attr = properties
 
         if (!properties) {
-            this._attr = {};
+            this.root = {};
         }
-
-        this._attr["xmlKeys"] = this.xmlKeys;
     }
 }