def test_mixed_arithmetic():
result = parse_arithmetic("12 + 34 * 56")
result.operator == "plus"
result.lhs = 12.0
result.rhs.operator = "multiply"
result.rhs.lhs = 34.0
result.rhs.rhs = 56.0
result = parse_arithmetic("12 / 34 - 56")
result.operator == "subtract"
result.lhs.operator = "divide"
result.lhs.lhs = 12.0
result.lhs.rhs = 34.0
result.rhs = 56.0
def test_mixed_arithmetic():
result, _ = parse_arithmetic("12 + 34 * 56")
assert result.operator == "plus"
assert result.lhs == 12.0
assert isinstance(result.rhs, Operation)
assert result.rhs.operator == "multiply"
assert result.rhs.lhs == 34.0
assert result.rhs.rhs == 56.0
result, _ = parse_arithmetic("12 / 34 - 56")
assert result.operator == "minus"
assert isinstance(result.lhs, Operation)
assert result.lhs.operator == "divide"
assert result.lhs.lhs == 12.0
assert result.lhs.rhs == 34.0
assert result.rhs == 56.0
def test_four_terms():
result = parse_arithmetic("1 + 2 / 3 * 4")
assert result.operator == "plus"
assert result.lhs == 1.0
assert result.rhs.operator == "multiply"
assert result.rhs.lhs.operator == "divide"
assert result.rhs.lhs.lhs == 2.0
assert result.rhs.lhs.rhs == 3.0
assert result.rhs.rhs == 4.0
def test_homogenous_arithmetic(a, op1, b, op2, c):
""" Test that literal order of ops is respected assuming we don't have to worry about BEDMAS """
equation = f"{a}{op1}{b}{op2}{c}"
result = parse_arithmetic(equation)
assert result.operator == op_map[op2.strip()], equation
assert result.lhs.operator == op_map[op1.strip()], equation
assert result.lhs.lhs == float(a), equation
assert result.lhs.rhs == float(b), equation
assert result.rhs == float(c), equation
def test_field_values(a, op, b):
equation = f"{a}{op}{b}"
result, fields = parse_arithmetic(equation)
assert result.operator == op_map[op.strip()], equation
assert result.lhs == a, equation
assert result.rhs == b, equation
if isinstance(a, str):
assert a in fields, equation
if isinstance(b, str):
assert b in fields, equation
def test_brackets_with_three_inner_terms():
result, _, _ = parse_arithmetic("(1 + 2 + 3) / 4")
assert result.operator == "divide"
assert isinstance(result.lhs, Operation)
assert result.lhs.operator == "plus"
assert isinstance(result.lhs.lhs, Operation)
assert result.lhs.lhs.lhs == 1.0
assert result.lhs.lhs.rhs == 2.0
assert result.lhs.rhs == 3.0
assert result.rhs == 4.0
def test_homogenous_four_terms(a, op1, b, op2, c, op3, d):
"""This basically tests flatten in the ArithmeticVisitor
flatten only kicks in when its a chain of the same operator type
"""
equation = f"{a}{op1}{b}{op2}{c}{op3}{d}"
result = parse_arithmetic(equation)
assert result.operator == op_map[op3.strip()], equation
assert result.lhs.operator == op_map[op2.strip()], equation
assert result.lhs.lhs.operator == op_map[op1.strip()], equation
assert result.lhs.lhs.lhs == float(a), equation
assert result.lhs.lhs.rhs == float(b), equation
assert result.lhs.rhs == float(c), equation
assert result.rhs == float(d), equation
def test_field_values(a, op, b):
for with_brackets in [False, True]:
equation = f"{a}{op}{b}"
if with_brackets:
equation = f"({equation}) + 5"
result, fields, functions = parse_arithmetic(equation)
if with_brackets:
assert result.operator == "plus"
assert isinstance(result.lhs, Operation)
assert result.rhs == 5.0
result = result.lhs
assert result.operator == op_map[op.strip()], equation
assert result.lhs == a, equation
assert result.rhs == b, equation
assert len(functions) == 0
if isinstance(a, str):
assert a in fields, equation
if isinstance(b, str):
assert b in fields, equation
def test_simple_arithmetic(a, op, b):
equation = f"{a}{op}{b}"
result, _ = parse_arithmetic(equation)
assert result.operator == op_map[op.strip()], equation
assert result.lhs == float(a), equation
assert result.rhs == float(b), equation
def test_invalid_arithmetic(equation):
with pytest.raises(ArithmeticValidationError):
parse_arithmetic(equation)
def test_single_term():
result, _ = parse_arithmetic("12")
assert result == 12.0
def test_unparseable_arithmetic(equation):
with pytest.raises(ArithmeticParseError):
parse_arithmetic(equation)
def test_max_operators():
with pytest.raises(MaxOperatorError):
parse_arithmetic("1 + 2 * 3 * 4", 2)
# exactly 3 should be ok
parse_arithmetic("1 + 2 * 3 * 4", 3)