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'''Test Fortran 2003 Cray-pointers: This file tests the support for a
Cray-pointee array specification.

'''

import pytest
from fparser.two.Fortran2003 import Cray_Pointee_Array_Spec
from fparser.two.utils import NoMatchError


def test_cray_pointee_array_spec(f2003_create):
    '''Check that Cray-pointee array specifications are parsed correctly.

    '''
    for myinput in ["n", "0 : n", "n, m", "5, *", "*", "0 : 1, 2 : *"]:
        ast = Cray_Pointee_Array_Spec(myinput)
        assert myinput in str(ast)


def test_errors(f2003_create):
    '''Check that syntax errors produce a NoMatchError exception.'''
    for myinput in ["", "  ", "2n", "2 n", "*, n"]:
        with pytest.raises(NoMatchError) as excinfo:
            _ = Cray_Pointee_Array_Spec(myinput)
        assert "Cray_Pointee_Array_Spec: '{0}'".format(myinput) in \
            str(excinfo.value)


def test_unsupported(f2003_create):
    '''Check that unsupported specifications produce a
    NoMatchError exception.

    '''
    for myinput in [":", "2,:"]:
        with pytest.raises(NoMatchError) as excinfo:
            _ = Cray_Pointee_Array_Spec(myinput)
        assert "Cray_Pointee_Array_Spec: '{0}'".format(myinput) in \
            str(excinfo.value)
