More math components

src/file/paragraph/math/script/sub-script/index.ts

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+export * from "./math-sub-script-function";
+export * from "./math-sub-script-function-properties";

src/file/paragraph/math/script/sub-script/math-sub-script-function-properties.spec.ts

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+import { expect } from "chai";
+
+import { Formatter } from "export/formatter";
+import { MathSubScriptProperties } from "./math-sub-script-function-properties";
+
+describe("MathSubScriptProperties", () => {
+    describe("#constructor()", () => {
+        it("should create a MathSubScriptProperties with correct root key", () => {
+            const mathSubScriptProperties = new MathSubScriptProperties();
+
+            const tree = new Formatter().format(mathSubScriptProperties);
+            expect(tree).to.deep.equal({
+                "m:sSubPr": {},
+            });
+        });
+    });
+});

src/file/paragraph/math/script/sub-script/math-sub-script-function-properties.ts

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+// http://www.datypic.com/sc/ooxml/e-m_sSubPr-1.html
+import { XmlComponent } from "file/xml-components";
+
+export class MathSubScriptProperties extends XmlComponent {
+    constructor() {
+        super("m:sSubPr");
+    }
+}

src/file/paragraph/math/script/sub-script/math-sub-script-function.spec.ts

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+import { expect } from "chai";
+
+import { Formatter } from "export/formatter";
+
+import { MathRun } from "../../math-run";
+import { MathSubScript } from "./math-sub-script-function";
+
+describe("MathSubScript", () => {
+    describe("#constructor()", () => {
+        it("should create a MathSubScript with correct root key", () => {
+            const mathSubScript = new MathSubScript({
+                child: new MathRun("e"),
+                subScript: new MathRun("2"),
+            });
+
+            const tree = new Formatter().format(mathSubScript);
+            expect(tree).to.deep.equal({
+                "m:sSub": [
+                    {
+                        "m:sSubPr": {},
+                    },
+                    {
+                        "m:e": [
+                            {
+                                "m:r": [
+                                    {
+                                        "m:t": ["e"],
+                                    },
+                                ],
+                            },
+                        ],
+                    },
+                    {
+                        "m:sub": [
+                            {
+                                "m:r": [
+                                    {
+                                        "m:t": ["2"],
+                                    },
+                                ],
+                            },
+                        ],
+                    },
+                ],
+            });
+        });
+    });
+});

src/file/paragraph/math/script/sub-script/math-sub-script-function.ts

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+// http://www.datypic.com/sc/ooxml/e-m_sSub-1.html
+import { XmlComponent } from "file/xml-components";
+
+import { MathComponent } from "../../math-component";
+import { MathBase, MathSubScriptElement } from "../../n-ary";
+import { MathSubScriptProperties } from "./math-sub-script-function-properties";
+
+export interface IMathSubScriptOptions {
+    readonly child: MathComponent;
+    readonly subScript: MathComponent;
+}
+
+export class MathSubScript extends XmlComponent {
+    constructor(options: IMathSubScriptOptions) {
+        super("m:sSub");
+
+        this.root.push(new MathSubScriptProperties());
+        this.root.push(new MathBase(options.child));
+        this.root.push(new MathSubScriptElement(options.subScript));
+    }
+}