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'''
Test Fortran 2003 rule R470: this file tests the support for the
various forms of implicit loop within an array constructor.

TODO #257 - these tests need expanding.

Further tests are required here to fully cover the rule.

'''

import pytest
from fparser.common.readfortran import FortranStringReader
from fparser.two import Fortran2003


@pytest.mark.usefixtures("f2003_create")
def test_implicit_loop_constructor_no_parentheses():
    ''' Test that the parser does not match an implicit loop if the
    surrounding parentheses are missing (R470). '''
    fcode = "(/ival, ival=1, nval, istep/)"
    reader = FortranStringReader(fcode)
    ast = Fortran2003.Array_Constructor(reader)
    assert ast is None


@pytest.mark.xfail(reason="#257 Constraint C497 is not checked.")
@pytest.mark.usefixtures("f2003_create")
def test_nested_implied_do():
    ''' Test C497 - the ac-do-variable of a nested implicit do shall not
    appear as the ac-do-variable of the containing implicit do. '''
    reader = FortranStringReader(
        "(/(JBODY,JBODY=1,SUM((/(JBODY,JBODY=1,4)/)))/)")
    ast = Fortran2003.Array_Constructor(reader)
    assert ast is None
