Function assertCharacterGroup

src/parseNode.ts:52–68

(
    group: ParseNode<"ordgroup">,
    errorMessage: string,
    allowSpaces?: boolean,
)

 * literal space counts as a character; `~` and `\ ` do not.
 */
export function assertCharacterGroup(
    group: ParseNode<"ordgroup">,
    errorMessage: string,
    allowSpaces?: boolean,
): string {
    let text = "";
    for (const node of group.body) {
        if (node.type === "textord") {
            text += node.text;
        } else if (allowSpaces && node.type === "spacing" && node.text === " ") {
            text += " ";
        } else {
            throw new ParseError(errorMessage, group);
        }
    }
    return text;
}