public static Long calculateLiteralValue(
            String calculation,
            Map<String, Long> inputs)
    {
        try {
            ParserRuleContext tree = parseTypeCalculation(calculation);
            CalculateTypeVisitor visitor = new CalculateTypeVisitor(inputs);
            BigInteger result = visitor.visit(tree);
            return result.longValueExact();
        }
        catch (StackOverflowError e) {
            throw new ParsingException("Type calculation is too large (stack overflow while parsing)");
        }
    }
@Test
    public void testBasicUsage()
    {
        assertEquals(calculateLiteralValue("42", ImmutableMap.of()), Long.valueOf(42));
        assertEquals(calculateLiteralValue("NULL", ImmutableMap.of()), Long.valueOf(0));
        assertEquals(calculateLiteralValue("null", ImmutableMap.of()), Long.valueOf(0));
        assertEquals(calculateLiteralValue("x", ImmutableMap.of("x", 42L)), Long.valueOf(42));
        assertEquals(calculateLiteralValue("(42)", ImmutableMap.of()), Long.valueOf(42));
        assertEquals(calculateLiteralValue("(NULL)", ImmutableMap.of()), Long.valueOf(0));
        assertEquals(calculateLiteralValue("(x)", ImmutableMap.of("x", 42L)), Long.valueOf(42));

        assertEquals(calculateLiteralValue("42 + 55", ImmutableMap.of()), Long.valueOf(42 + 55));
        assertEquals(calculateLiteralValue("42 - 55", ImmutableMap.of()), Long.valueOf(42 - 55));
        assertEquals(calculateLiteralValue("42 * 55", ImmutableMap.of()), Long.valueOf(42 * 55));
        assertEquals(calculateLiteralValue("42 / 6", ImmutableMap.of()), Long.valueOf(42 / 6));

        assertEquals(calculateLiteralValue("42 + 55 * 6", ImmutableMap.of()), Long.valueOf(42 + 55 * 6));
        assertEquals(calculateLiteralValue("(42 + 55) * 6", ImmutableMap.of()), Long.valueOf((42 + 55) * 6));

        assertEquals(calculateLiteralValue("min(10,2)", ImmutableMap.of()), Long.valueOf(2));
        assertEquals(calculateLiteralValue("min(10,2*10)", ImmutableMap.of()), Long.valueOf(10));
        assertEquals(calculateLiteralValue("max(10,2*10)", ImmutableMap.of()), Long.valueOf(20));
        assertEquals(calculateLiteralValue("max(10,2)", ImmutableMap.of()), Long.valueOf(10));

        assertEquals(calculateLiteralValue("x + y", ImmutableMap.of("x", 42L, "y", 55L)), Long.valueOf(42 + 55));
    }