default @SideEffectFree boolean isEmpty(final boolean ignoreWhitespace) {
        return !this.hasRemainingInput(ignoreWhitespace);
    }
Returns whether there is nothing left to read.

@param ignoreWhitespace whether to ignore whitespace
@return whether there is nothing left to read.
cloud-core/src/main/java/org/incendo/cloud/context/CommandInput.java