caret / packages / math / src / nodes / add.ts

import { CaretNode, h, t, VNode } from "@caret-js/core";
import { MathExpressionTag } from "../tags/mathExpression";

export class AddNode extends CaretNode {
  constructor(public addends: CaretNode[]) {
    super();
    this.addTag(new MathExpressionTag());
  }

  static from(addends: CaretNode[]): AddNode {
    return new AddNode(
      addends.flatMap((node) =>
        node instanceof AddNode ? node.addends : [node]
      )
    ).mergeTagsFromNodes(addends.filter((node) => node instanceof AddNode));
  }

  toDebugMathML(): VNode {
    return h(
      "mrow",
      {},
      ...this.addends.flatMap((addend, index) => [
        addend.toDebugMathML(),
        index < this.addends.length - 1 ? h("mo", {}, t("+")) : null,
      ])
    );
  }
}