Add Math Summation

src/file/paragraph/math/n-ary/math-sum.ts

@@ -0,0 +1,25 @@
+// http://www.datypic.com/sc/ooxml/e-m_nary-1.html
+import { XmlComponent } from "file/xml-components";
+
+import { MathRun } from "../math-run";
+import { MathBase } from "./math-base";
+import { MathNArayProperties } from "./math-naray-properties";
+import { MathSubScript } from "./math-sub-script";
+import { MathSuperScript } from "./math-super-script";
+
+export interface IMathSumOptions {
+    readonly child: MathRun;
+    readonly subScript?: MathRun;
+    readonly superScript?: MathRun;
+}
+
+export class MathSum extends XmlComponent {
+    constructor(readonly options: IMathSumOptions) {
+        super("m:nary");
+
+        this.root.push(new MathNArayProperties("∑"));
+        this.root.push(new MathSubScript(options.child));
+        this.root.push(new MathSuperScript(options.child));
+        this.root.push(new MathBase(options.child));
+    }
+}