Function createFunction

src/expression/parser.ts:670–677

(func: string | P.Parser<string>, args: P.Parser<T>)

 * Create a parser which parses \<function\>(\<args\>).
 * */
export function createFunction<T>(func: string | P.Parser<string>, args: P.Parser<T>): P.Parser<[string, T]> {
    const realFunc = typeof func === "string" ? P.string(func) : func;
    return P.seqMap(
        realFunc.skip(P.optWhitespace),
        args.trim(P.optWhitespace).wrap(P.string("("), P.string(")")),
        (f, a) => [f, a]
    );
}

/** Chains a list of parsers; the first one must succeed, but following ones may fail without failing the overall parse. */
export function chainOpt<T>(base: P.Parser<T>, ...funcs: ((r: T) => P.Parser<T>)[]): P.Parser<T> {