feat: add msubsup single command use case

src/converters/mathml-interfaces-to-latex/mathml-tag-to-latex/Dispatcher.ts

@@ -16,6 +16,7 @@ import {
   MPhantom,
   MSup,
   MSub,
+  MSubsup,
 } from './mathml-tags';
 
 export class Dispatcher {
@@ -63,6 +64,8 @@ export class Dispatcher {
         return new MSup(this._value, this._attributes, this._children);
       case 'msub':
         return new MSub(this._value, this._attributes, this._children);
+      case 'msubsup':
+        return new MSubsup(this._value, this._attributes, this._children);
       case 'mrow':
       case 'mpadded':
         return new GenericContentWrapperTag(this._name, this._value, this._attributes, this._children);

src/converters/mathml-interfaces-to-latex/mathml-tag-to-latex/mathml-tags/MSubsup.ts

@@ -0,0 +1,22 @@
+import { MathMLTag } from './MathMLTag';
+import { BracketWrapper } from '../../../../utils/wrappers';
+import { InvalidNumberOfChild } from '../../../../errors';
+
+export class MSubsup extends MathMLTag {
+  constructor(value: string, attributes: Record<string, string>, children: MathMLTag[]) {
+    super('msubsup', value, attributes, children);
+  }
+
+  convert(): string {
+    if (this._children.length !== 3) throw new InvalidNumberOfChild(this._name, 2, this._children.length);
+
+    const base = this._children[0].convert();
+    const sub = this._children[1].convert();
+    const sup = this._children[2].convert();
+
+    const wrappedSub = new BracketWrapper().wrap(sub);
+    const wrappedSup = new BracketWrapper().wrap(sup);
+
+    return `${base}_${wrappedSub}^${wrappedSup}`;
+  }
+}

src/converters/mathml-interfaces-to-latex/mathml-tag-to-latex/mathml-tags/index.ts

@@ -15,3 +15,4 @@ export { MOver } from './MOver';
 export { MPhantom } from './MPhantom';
 export { MSup } from './MSup';
 export { MSub } from './MSub';
+export { MSubsup } from './MSubsup';