def simplify(expr):
n = _try_eval(expr)
if n is not None:
return type_check.Constant(n)
if isinstance(expr, type_check.BinaryOperator):
rhs_value = _try_eval(expr.rhs)
if rhs_value is not None:
if (expr.exp == '+' or expr.exp == '-') and rhs_value == 0:
return simplify(expr.lhs)
if expr.exp == '+' and rhs_value < 0:
expr_rhs = type_check.Constant(-rhs_value)
return simplify(_make_binop_expr(expr.lhs, expr_rhs, '-'))
if expr.exp == '-' and rhs_value < 0:
expr_rhs = type_check.Constant(-rhs_value)
return simplify(_make_binop_expr(expr.lhs, expr_rhs, '+'))
if (expr.exp == '*' or expr.exp == '/'
or expr.exp == '//') and rhs_value == 1:
return simplify(expr.lhs)
lhs_value = _try_eval(expr.lhs)
if lhs_value is not None:
if expr.exp == '+' and lhs_value == 0:
return simplify(expr.rhs)
if isinstance(expr.lhs, type_check.BinaryOperator) and \
expr.lhs.priority == expr.priority:
if expr.lhs.exp == '+' or expr.lhs.exp == '*':
expr_exp = expr.exp
elif expr.lhs.exp == '-':
if expr.exp == '+':
expr_exp = '-'
else:
expr_exp = '+'
else:
assert False
_, expr_func = binops[expr_exp]
expr_rhs = type_check.BinaryOperator(expr.priority, expr.lhs.rhs,
expr.rhs, expr_exp, expr_func)
expr_rhs = simplify(expr_rhs)
if isinstance(expr_rhs, type_check.Constant):
return simplify(
type_check.BinaryOperator(expr.lhs.priority, expr.lhs.lhs,
expr_rhs, expr.lhs.exp,
expr.lhs.func))
expr.lhs = simplify(expr.lhs)
expr.rhs = simplify(expr.rhs)
# if isinstance(expr, type_check.UnaryOperator):
# expr.term = simplify(expr.term)
return expr
def __init__(self, value_or_name, expr=None):
assert type(value_or_name) in [int, float, str, type(None)]
if isinstance(value_or_name, str):
# name
self.value = None
self.expr = type_check.Variable(None, value_or_name)
else:
# value
self.value = value_or_name
self.expr = simplify(
expr) if expr is not None else type_check.Constant(
value_or_name)
def __init__(self, value_or_name, expr=None):
assert type(value_or_name) in [int, float, str, type(None)]
if isinstance(value_or_name, str):
# name (given via type hints)
self.value = value_or_name
self.expr = None
else:
# value
self.value = value_or_name
if expr is None:
self.expr = type_check.Constant(value_or_name)
else:
self.expr = simplify(expr)
def _make_binop(lhs, rhs, symbol):
priority, func = binops[symbol]
if not isinstance(rhs, ShapeElem):
if lhs.value is None:
return ShapeElem(None)
expr = type_check.BinaryOperator(priority, lhs.expr,
type_check.Constant(rhs), symbol,
func)
return ShapeElem(func(lhs.value, rhs), expr=expr)
if not isinstance(lhs, ShapeElem):
if rhs.value is None:
return ShapeElem(None)
expr = type_check.BinaryOperator(priority, type_check.Constant(lhs),
rhs.expr, symbol, func)
return ShapeElem(func(lhs, rhs.value), expr=expr)
if lhs.value is None or rhs.value is None:
return ShapeElem(None)
expr = type_check.BinaryOperator(priority, lhs.expr, rhs.expr, symbol,
func)
return ShapeElem(func(lhs.value, rhs.value), expr=expr)
def setUp(self):
x = Object()
self.value = T.GetAttr(T.Variable(x, 'x'), 'value')
self.value2 = T.GetAttr(T.Variable(x, 'x'), T.Constant('value'))
self.value3 = T.GetAttr(T.Variable(x, 'x'), 3)
def test_nest_list_str(self):
self.assertEqual('[[0]]', T._repr([[T.Constant(0)]]))
def test_eval_nest_list(self):
self.assertTrue((T.Constant([[0]]) == [[T.Constant(0)]]).eval())
def test_tuple_str(self):
self.assertEqual('()', T._repr(()))
self.assertEqual('(0,)', T._repr((T.Constant(0),)))
self.assertEqual('(0, 0)', T._repr((T.Constant(0), T.Constant(0))))
def test_eval_tuple_items(self):
self.assertTrue((T.Constant((0,)) == (T.Constant(0),)).eval())
def test_eval_list_items(self):
self.assertTrue((T.Constant([0]) == [T.Constant(0)]).eval())
def setUp(self):
self.t = T.Constant(0)
def setUp(self):
self.x = T.Constant(10)
