Method handleSupSubscript

static/katex/katex.mjs:15085–15098

* Handle a subscript or superscript with nice errors.

(name)

   * Handle a subscript or superscript with nice errors.
   */
  handleSupSubscript(name) {
    const symbolToken = this.nextToken;
    const symbol = symbolToken.text;
    this.consume();
    this.consumeSpaces(); // ignore spaces before sup/subscript argument

    const group = this.parseGroup(name, false, Parser.SUPSUB_GREEDINESS);

    if (!group) {
      throw new ParseError("Expected group after '" + symbol + "'", symbolToken);
    }

    return group;
  }
  /**
   * Converts the textual input of an unsupported command into a text node
   * contained within a color node whose color is determined by errorColor