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'''Test Fortran 2008 rule R837

    if-stmt is IF ( scalar-logical-expr ) action-stmt
'''

import pytest
from fparser.two.Fortran2003 import Stop_Stmt, Assignment_Stmt
from fparser.two.Fortran2008 import If_Stmt
from fparser.two.utils import walk, NoMatchError


@pytest.mark.usefixtures("f2008_create")
def test_simple_stop():
    '''Test matching of a valid string.'''
    result = If_Stmt('IF (5 > 3) STOP')
    assert isinstance(result, If_Stmt)
    assert walk(result, Stop_Stmt)


@pytest.mark.usefixtures("f2008_create")
def test_simple_assignment():
    '''Test matching of a valid string.'''
    result = If_Stmt('IF (A < B) A = B')
    assert isinstance(result, If_Stmt)
    assignments = walk(result, Assignment_Stmt)
    assert len(assignments) == 1
    assert str(assignments[0]) == 'A = B'


@pytest.mark.usefixtures("f2008_create")
def test_error1():
    '''Test invalid syntax doesn't match.'''
    with pytest.raises(NoMatchError) as excinfo:
        _ = If_Stmt('IFF (5 > 3) STOP')
    assert "If_Stmt: 'IFF (5 > 3) STOP'" in str(excinfo.value)


@pytest.mark.usefixtures("f2008_create")
def test_error2():
    '''Test invalid syntax doesn't match.'''
    with pytest.raises(NoMatchError) as excinfo:
        _ = If_Stmt('IF 5 > 3 STOP')
    assert "If_Stmt: 'IF 5 > 3 STOP'" in str(excinfo.value)


@pytest.mark.usefixtures("f2008_create")
def test_error3():
    '''Test invalid syntax doesn't match.'''
    with pytest.raises(NoMatchError) as excinfo:
        _ = If_Stmt('IF (5 > 3] STOP')
    assert "If_Stmt: 'IF (5 > 3] STOP'" in str(excinfo.value)


@pytest.mark.usefixtures("f2008_create")
def test_error4():
    '''Test invalid syntax doesn't match.'''
    with pytest.raises(NoMatchError) as excinfo:
        _ = If_Stmt('IF (A = B) A = 0')
    assert "If_Stmt: 'IF (A = B) A = 0'" in str(excinfo.value)
