import WebIDL


def WebIDLTest(parser, harness):
    # Check that error messages put the '^' in the right place.

    threw = False
    input = "interface ?"
    try:
        parser.parse(input)
        results = parser.finish()
    except WebIDL.WebIDLError as e:
        threw = True
        lines = str(e).split("\n")

        harness.check(len(lines), 3, "Expected number of lines in error message")
        harness.check(lines[1], input, "Second line shows error")
        harness.check(
            lines[2],
            " " * (len(input) - 1) + "^",
            "Correct column pointer in error message",
        )

    harness.ok(threw, "Should have thrown.")