def visit_Bytes(self, node):
new_node = gast.Constant(
node.s,
None,
)
gast.copy_location(new_node, node)
return new_node
def visit_Name(self, node):
"""
Replace name with full expanded name.
Examples
--------
>> from numpy.linalg import det
>> det(a)
Becomes
>> numpy.linalg.det(a)
"""
if node.id in self.symbols:
symbol = path_to_node(self.symbols[node.id])
if not getattr(symbol, 'isliteral', lambda: False)():
parent = self.ancestors[node][-1]
blacklist = (ast.Tuple,
ast.List,
ast.Set,
ast.Return)
if isinstance(parent, blacklist):
raise PythranSyntaxError(
"Unsupported module identifier manipulation",
node)
new_node = path_to_attr(self.symbols[node.id])
new_node.ctx = node.ctx
ast.copy_location(new_node, node)
return new_node
return node
def visit_Name(self, node):
"""
Replace name with full expanded name.
Examples
--------
>> from numpy.linalg import det
>> det(a)
Becomes
>> numpy.linalg.det(a)
"""
if node.id in self.symbols:
symbol = path_to_node(self.symbols[node.id])
if not getattr(symbol, 'isliteral', lambda: False)():
parent = self.ancestors[node][-1]
blacklist = (ast.Tuple, ast.List, ast.Set, ast.Return)
if isinstance(parent, blacklist):
raise PythranSyntaxError(
"Unsupported module identifier manipulation", node)
new_node = path_to_attr(self.symbols[node.id])
new_node.ctx = node.ctx
ast.copy_location(new_node, node)
return new_node
return node
def visit_Call(self, node):
if sys.version_info.minor < 5:
if node.starargs:
star = gast.Starred(self._visit(node.starargs),
gast.Load())
gast.copy_location(star, node)
starred = [star]
else:
starred = []
if node.kwargs:
kw = gast.keyword(None, self._visit(node.kwargs))
gast.copy_location(kw, node.kwargs)
kwargs = [kw]
else:
kwargs = []
else:
starred = kwargs = []
new_node = gast.Call(
self._visit(node.func),
self._visit(node.args) + starred,
self._visit(node.keywords) + kwargs,
)
return gast.copy_location(new_node, node)
def visit_AsyncWith(self, node):
new_node = gast.AsyncWith(
self._visit(node.items),
self._visit(node.body),
None, # type_comment
)
gast.copy_location(new_node, node)
return new_node
def visit_Str(self, node):
new_node = gast.Constant(
node.s,
None,
)
gast.copy_location(new_node, node)
new_node.end_lineno = new_node.end_col_offset = None
return new_node
def visit_NameConstant(self, node):
if node.value is None:
new_node = gast.Constant(None, None)
elif node.value is True:
new_node = gast.Constant(True, None)
elif node.value is False:
new_node = gast.Constant(False, None)
gast.copy_location(new_node, node)
return new_node
def visit_TryFinally(self, node):
new_node = gast.Try(
self._visit(node.body),
[], # handlers
[], # orelse
self._visit(node.finalbody))
gast.copy_location(new_node, node)
new_node.end_lineno = new_node.end_col_offset = None
return new_node
def test_copy_location(self):
tree = gast.Constant(value=1, kind=None)
tree.lineno = 1
tree.col_offset = 2
node = gast.Constant(value=2, kind=None)
gast.copy_location(node, tree)
self.assertEqual(node.lineno, tree.lineno)
self.assertEqual(node.col_offset, tree.col_offset)
def test_copy_location(self):
tree = gast.Num(n=1)
tree.lineno = 1
tree.col_offset = 2
node = gast.Num(n=2)
gast.copy_location(node, tree)
self.assertEqual(node.lineno, tree.lineno)
self.assertEqual(node.col_offset, tree.col_offset)
def visit_Name(self, node):
new_node = gast.Name(
self._visit(node.id),
self._visit(node.ctx),
None,
None,
)
gast.copy_location(new_node, node)
new_node.end_lineno = new_node.end_col_offset = None
return new_node
def visit_Assign(self, node):
new_node = gast.Assign(
self._visit(node.targets),
self._visit(node.value),
None, # type_comment
)
gast.copy_location(new_node, node)
new_node.end_lineno = new_node.end_col_offset = None
return new_node
def visit_Subscript(self, node):
new_slice = self._visit(node.slice)
new_node = gast.Subscript(
self._visit(node.value),
new_slice,
self._visit(node.ctx),
)
gast.copy_location(new_node, node)
new_node.end_lineno = new_node.end_col_offset = None
return new_node
def visit_comprehension(self, node):
new_node = gast.comprehension(
target=self._visit(node.target),
iter=self._visit(node.iter),
ifs=self._visit(node.ifs),
is_async=0,
)
gast.copy_location(new_node, node)
new_node.end_lineno = new_node.end_col_offset = None
return new_node
def visit_AsyncFor(self, node):
new_node = gast.AsyncFor(
self._visit(node.target),
self._visit(node.iter),
self._visit(node.body),
self._visit(node.orelse),
None, # type_comment
)
gast.copy_location(new_node, node)
return new_node
def visit_TryExcept(self, node):
new_node = gast.Try(
self._visit(node.body),
self._visit(node.handlers),
self._visit(node.orelse),
[] # finalbody
)
gast.copy_location(new_node, node)
new_node.end_lineno = new_node.end_col_offset = None
return new_node
def visit_AsyncFunctionDef(self, node):
new_node = gast.AsyncFunctionDef(
self._visit(node.name),
self._visit(node.args),
self._visit(node.body),
self._visit(node.decorator_list),
self._visit(node.returns),
None, # type_comment
)
gast.copy_location(new_node, node)
return new_node
def visit_For(self, node):
new_node = gast.For(
self._visit(node.target),
self._visit(node.iter),
self._visit(node.body),
self._visit(node.orelse),
[] # type_comment
)
gast.copy_location(new_node, node)
new_node.end_lineno = new_node.end_col_offset = None
return new_node
def visit_With(self, node):
new_node = gast.With(
[
gast.withitem(self._visit(node.context_expr),
self._visit(node.optional_vars))
],
self._visit(node.body),
None, # type_comment
)
gast.copy_location(new_node, node)
new_node.end_lineno = new_node.end_col_offset = None
return new_node
def visit_ClassDef(self, node):
new_node = gast.ClassDef(
self._visit(node.name),
self._visit(node.bases),
[], # keywords
self._visit(node.body),
self._visit(node.decorator_list),
)
gast.copy_location(new_node, node)
new_node.end_lineno = new_node.end_col_offset = None
return new_node
def visit_arguments(self, node):
new_node = gast.arguments(
self._visit(node.args),
[], # posonlyargs
self._visit(node.vararg),
self._visit(node.kwonlyargs),
self._visit(node.kw_defaults),
self._visit(node.kwarg),
self._visit(node.defaults),
)
gast.copy_location(new_node, node)
return new_node
def visit_FunctionDef(self, node):
new_node = gast.FunctionDef(
self._visit(node.name),
self._visit(node.args),
self._visit(node.body),
self._visit(node.decorator_list),
None, # returns
None, # type_comment
)
gast.copy_location(new_node, node)
new_node.end_lineno = new_node.end_col_offset = None
return new_node
def visit_Raise(self, node):
ntype = self._visit(node.type)
ninst = self._visit(node.inst)
ntback = self._visit(node.tback)
what = ntype
if ninst is not None:
what = gast.Call(ntype, [ninst], [])
gast.copy_location(what, node)
what.end_lineno = what.end_col_offset = None
if ntback is not None:
attr = gast.Attribute(what, 'with_traceback', gast.Load())
gast.copy_location(attr, node)
attr.end_lineno = attr.end_col_offset = None
what = gast.Call(attr, [ntback], [])
gast.copy_location(what, node)
what.end_lineno = what.end_col_offset = None
new_node = gast.Raise(what, None)
gast.copy_location(new_node, node)
new_node.end_lineno = new_node.end_col_offset = None
return new_node
def visit_ExtSlice(self, node):
has_ellipsis = any(isinstance(d, ast.Ellipsis) for d in node.dims)
has_slice = any(isinstance(d, ast.Slice) for d in node.dims)
new_dims = self._visit(node.dims)
if has_ellipsis and not has_slice:
new_dims = [
nd.value if isinstance(nd, gast.Index) else nd
for nd in new_dims
]
new_node = gast.Index(gast.Tuple(new_dims, gast.Load()))
else:
new_node = gast.ExtSlice(new_dims)
gast.copy_location(new_node, node)
new_node.end_lineno = new_node.end_col_offset = None
return new_node
def generic_visit(self, node):
if isinstance(node, gast.stmt):
if self.stack_has_flags(
self.for_continued_stack) or self.stack_has_flags(
self.for_breaked_stack) or self.stack_has_flags(
self.func_returned_stack):
bool_values = []
if self.stack_has_flags(self.for_continued_stack):
continued_id = len(self.for_continued_stack)
bool_values.append(
gast.UnaryOp(op=gast.Not(),
operand=gast.Name(id=self.continued_flag +
str(continued_id),
ctx=gast.Load(),
annotation=None,
type_comment=None)))
if self.stack_has_flags(self.for_breaked_stack):
breaked_id = len(self.for_breaked_stack)
bool_values.append(
gast.UnaryOp(op=gast.Not(),
operand=gast.Name(id=self.breaked_flag +
str(breaked_id),
ctx=gast.Load(),
annotation=None,
type_comment=None)))
if self.stack_has_flags(self.func_returned_stack):
returned_id = len(self.func_returned_stack)
bool_values.append(
gast.UnaryOp(op=gast.Not(),
operand=gast.Name(id=self.returned_flag +
str(returned_id),
ctx=gast.Load(),
annotation=None,
type_comment=None)))
if isinstance(node, gast.For):
self.for_continued_stack.append(False)
self.for_breaked_stack.append(False)
elif isinstance(node, gast.FunctionDef):
self.func_returned_stack.append(False)
modified_node = super().generic_visit(node)
if len(bool_values) == 1:
cond = bool_values[0]
else:
cond = gast.BoolOp(op=gast.And(), values=bool_values)
replacement = gast.If(test=cond,
body=[modified_node],
orelse=[])
ret = gast.copy_location(replacement, node)
else:
if isinstance(node, gast.For):
self.for_continued_stack.append(False)
self.for_breaked_stack.append(False)
elif isinstance(node, gast.FunctionDef):
self.func_returned_stack.append(False)
ret = super().generic_visit(node)
else:
ret = super().generic_visit(node)
return ret
def visit_Break(self, node):
node = self.generic_visit(node)
flag = self.breaked_flag + str(self.getflag())
self.for_breaked_stack[-1].append(flag)
replacement = gast.Assign(
targets=[gast.Name(id=flag, ctx=gast.Store(), annotation=None)],
value=gast.NameConstant(value=True))
return gast.copy_location(replacement, node)
def visit_UnaryOp(self, node):
node = self.generic_visit(node)
if isinstance(node.op, gast.USub) and isinstance(node.operand, gast.Num):
value = node.operand.n
replacement = gast.Num(n=-value)
return gast.copy_location(replacement, node)
else:
return node
def visit(self, node: AST) -> AST:
# recursively visit child nodes
super().visit(node)
# on visit: transform node and fix code locations
new_node = gast.copy_location(new_node=self.transform_fn(node), old_node=node)
new_node = gast.fix_missing_locations(new_node)
return new_node
def visit_UnaryOp(self, node):
node = self.generic_visit(node)
if isinstance(node.op, gast.USub) and (
isinstance(node.operand, gast.Constant)
and isinstance(node.operand.value, numbers.Number)):
value = node.operand.value
replacement = gast.Constant(value=-value, kind=None)
return gast.copy_location(replacement, node)
else:
return node
def visit_Name(self, node):
"""
Replace name with full expanded name.
Examples
--------
>> from numpy.linalg import det
>> det(a)
Becomes
>> numpy.linalg.det(a)
"""
if node.id in self.symbols:
new_node = path_to_attr(self.symbols[node.id])
new_node.ctx = node.ctx
ast.copy_location(new_node, node)
return new_node
return node
def visit_Name(self, node):
"""
Replace name with full expanded name.
Examples
--------
>> from numpy.linalg import det
>> det(a)
Becomes
>> numpy.linalg.det(a)
"""
if node.id in self.symbols:
new_node = path_to_attr(self.symbols[node.id])
new_node.ctx = node.ctx
ast.copy_location(new_node, node)
return new_node
return node
def visit_Break(self, node):
modified_node = self.generic_visit(node)
self.for_breaked_stack[-1] = True
breaked_id = len(self.for_breaked_stack)
replacement = gast.Assign(targets=[
gast.Name(id=self.breaked_flag + str(breaked_id),
ctx=gast.Store(),
annotation=None,
type_comment=None)
],
value=gast.Constant(value=True, kind=None))
return gast.copy_location(replacement, node)
def analyse(node, env, non_generic=None):
"""Computes the type of the expression given by node.
The type of the node is computed in the context of the context of the
supplied type environment env. Data types can be introduced into the
language simply by having a predefined set of identifiers in the initial
environment. Environment; this way there is no need to change the syntax
or more importantly, the type-checking program when extending the language.
Args:
node: The root of the abstract syntax tree.
env: The type environment is a mapping of expression identifier names
to type assignments.
non_generic: A set of non-generic variables, or None
Returns:
The computed type of the expression.
Raises:
InferenceError: The type of the expression could not be inferred,
PythranTypeError: InferenceError with user friendly message + location
"""
if non_generic is None:
non_generic = set()
# expr
if isinstance(node, gast.Name):
if isinstance(node.ctx, (gast.Store)):
new_type = TypeVariable()
non_generic.add(new_type)
env[node.id] = new_type
return get_type(node.id, env, non_generic)
elif isinstance(node, gast.Num):
if isinstance(node.n, int):
return Integer()
elif isinstance(node.n, float):
return Float()
elif isinstance(node.n, complex):
return Complex()
else:
raise NotImplementedError
elif isinstance(node, gast.Str):
return Str()
elif isinstance(node, gast.Compare):
left_type = analyse(node.left, env, non_generic)
comparators_type = [analyse(comparator, env, non_generic)
for comparator in node.comparators]
ops_type = [analyse(op, env, non_generic)
for op in node.ops]
prev_type = left_type
result_type = TypeVariable()
for op_type, comparator_type in zip(ops_type, comparators_type):
try:
unify(Function([prev_type, comparator_type], result_type),
op_type)
prev_type = comparator_type
except InferenceError:
raise PythranTypeError(
"Invalid comparison, between `{}` and `{}`".format(
prev_type,
comparator_type
),
node)
return result_type
elif isinstance(node, gast.Call):
if is_getattr(node):
self_type = analyse(node.args[0], env, non_generic)
attr_name = node.args[1].s
_, attr_signature = attributes[attr_name]
attr_type = tr(attr_signature)
result_type = TypeVariable()
try:
unify(Function([self_type], result_type), attr_type)
except InferenceError:
if isinstance(prune(attr_type), MultiType):
msg = 'no attribute found, tried:\n{}'.format(attr_type)
else:
msg = 'tried {}'.format(attr_type)
raise PythranTypeError(
"Invalid attribute for getattr call with self"
"of type `{}`, {}".format(self_type, msg), node)
else:
fun_type = analyse(node.func, env, non_generic)
arg_types = [analyse(arg, env, non_generic) for arg in node.args]
result_type = TypeVariable()
try:
unify(Function(arg_types, result_type), fun_type)
except InferenceError:
# recover original type
fun_type = analyse(node.func, env, non_generic)
if isinstance(prune(fun_type), MultiType):
msg = 'no overload found, tried:\n{}'.format(fun_type)
else:
msg = 'tried {}'.format(fun_type)
raise PythranTypeError(
"Invalid argument type for function call to "
"`Callable[[{}], ...]`, {}"
.format(', '.join('{}'.format(at) for at in arg_types),
msg),
node)
return result_type
elif isinstance(node, gast.IfExp):
test_type = analyse(node.test, env, non_generic)
unify(Function([test_type], Bool()),
tr(MODULES['__builtin__']['bool_']))
if is_test_is_none(node.test):
none_id = node.test.left.id
body_env = env.copy()
body_env[none_id] = NoneType
else:
none_id = None
body_env = env
body_type = analyse(node.body, body_env, non_generic)
if none_id:
orelse_env = env.copy()
if is_option_type(env[none_id]):
orelse_env[none_id] = prune(env[none_id]).types[0]
else:
orelse_env[none_id] = TypeVariable()
else:
orelse_env = env
orelse_type = analyse(node.orelse, orelse_env, non_generic)
try:
return merge_unify(body_type, orelse_type)
except InferenceError:
raise PythranTypeError(
"Incompatible types from different branches:"
"`{}` and `{}`".format(
body_type,
orelse_type
),
node
)
elif isinstance(node, gast.UnaryOp):
operand_type = analyse(node.operand, env, non_generic)
op_type = analyse(node.op, env, non_generic)
result_type = TypeVariable()
try:
unify(Function([operand_type], result_type), op_type)
return result_type
except InferenceError:
raise PythranTypeError(
"Invalid operand for `{}`: `{}`".format(
symbol_of[type(node.op)],
operand_type
),
node
)
elif isinstance(node, gast.BinOp):
left_type = analyse(node.left, env, non_generic)
op_type = analyse(node.op, env, non_generic)
right_type = analyse(node.right, env, non_generic)
result_type = TypeVariable()
try:
unify(Function([left_type, right_type], result_type), op_type)
except InferenceError:
raise PythranTypeError(
"Invalid operand for `{}`: `{}` and `{}`".format(
symbol_of[type(node.op)],
left_type,
right_type),
node
)
return result_type
elif isinstance(node, gast.Pow):
return tr(MODULES['numpy']['power'])
elif isinstance(node, gast.Sub):
return tr(MODULES['operator_']['sub'])
elif isinstance(node, (gast.USub, gast.UAdd)):
return tr(MODULES['operator_']['pos'])
elif isinstance(node, (gast.Eq, gast.NotEq, gast.Lt, gast.LtE, gast.Gt,
gast.GtE, gast.Is, gast.IsNot)):
return tr(MODULES['operator_']['eq'])
elif isinstance(node, (gast.In, gast.NotIn)):
contains_sig = tr(MODULES['operator_']['contains'])
contains_sig.types[:-1] = reversed(contains_sig.types[:-1])
return contains_sig
elif isinstance(node, gast.Add):
return tr(MODULES['operator_']['add'])
elif isinstance(node, gast.Mult):
return tr(MODULES['operator_']['mul'])
elif isinstance(node, gast.MatMult):
return tr(MODULES['operator_']['matmul'])
elif isinstance(node, (gast.Div, gast.FloorDiv)):
return tr(MODULES['operator_']['floordiv'])
elif isinstance(node, gast.Mod):
return tr(MODULES['operator_']['mod'])
elif isinstance(node, (gast.LShift, gast.RShift)):
return tr(MODULES['operator_']['lshift'])
elif isinstance(node, (gast.BitXor, gast.BitAnd, gast.BitOr)):
return tr(MODULES['operator_']['lshift'])
elif isinstance(node, gast.List):
new_type = TypeVariable()
for elt in node.elts:
elt_type = analyse(elt, env, non_generic)
try:
unify(new_type, elt_type)
except InferenceError:
raise PythranTypeError(
"Incompatible list element type `{}` and `{}`".format(
new_type, elt_type),
node
)
return List(new_type)
elif isinstance(node, gast.Set):
new_type = TypeVariable()
for elt in node.elts:
elt_type = analyse(elt, env, non_generic)
try:
unify(new_type, elt_type)
except InferenceError:
raise PythranTypeError(
"Incompatible set element type `{}` and `{}`".format(
new_type, elt_type),
node
)
return Set(new_type)
elif isinstance(node, gast.Dict):
new_key_type = TypeVariable()
for key in node.keys:
key_type = analyse(key, env, non_generic)
try:
unify(new_key_type, key_type)
except InferenceError:
raise PythranTypeError(
"Incompatible dict key type `{}` and `{}`".format(
new_key_type, key_type),
node
)
new_value_type = TypeVariable()
for value in node.values:
value_type = analyse(value, env, non_generic)
try:
unify(new_value_type, value_type)
except InferenceError:
raise PythranTypeError(
"Incompatible dict value type `{}` and `{}`".format(
new_value_type, value_type),
node
)
return Dict(new_key_type, new_value_type)
elif isinstance(node, gast.Tuple):
return Tuple([analyse(elt, env, non_generic) for elt in node.elts])
elif isinstance(node, gast.Index):
return analyse(node.value, env, non_generic)
elif isinstance(node, gast.Slice):
def unify_int_or_none(t, name):
try:
unify(t, Integer())
except InferenceError:
try:
unify(t, NoneType)
except InferenceError:
raise PythranTypeError(
"Invalid slice {} type `{}`, expecting int or None"
.format(name, t)
)
if node.lower:
lower_type = analyse(node.lower, env, non_generic)
unify_int_or_none(lower_type, 'lower bound')
else:
lower_type = Integer()
if node.upper:
upper_type = analyse(node.upper, env, non_generic)
unify_int_or_none(upper_type, 'upper bound')
else:
upper_type = Integer()
if node.step:
step_type = analyse(node.step, env, non_generic)
unify_int_or_none(step_type, 'step')
else:
step_type = Integer()
return Slice
elif isinstance(node, gast.ExtSlice):
return [analyse(dim, env, non_generic) for dim in node.dims]
elif isinstance(node, gast.NameConstant):
if node.value is None:
return env['None']
elif isinstance(node, gast.Subscript):
new_type = TypeVariable()
value_type = prune(analyse(node.value, env, non_generic))
try:
slice_type = prune(analyse(node.slice, env, non_generic))
except PythranTypeError as e:
raise PythranTypeError(e.msg, node)
if isinstance(node.slice, gast.ExtSlice):
nbslice = len(node.slice.dims)
dtype = TypeVariable()
try:
unify(Array(dtype, nbslice), clone(value_type))
except InferenceError:
raise PythranTypeError(
"Dimension mismatch when slicing `{}`".format(value_type),
node)
return TypeVariable() # FIXME
elif isinstance(node.slice, gast.Index):
# handle tuples in a special way
isnum = isinstance(node.slice.value, gast.Num)
if isnum and is_tuple_type(value_type):
try:
unify(prune(prune(value_type.types[0]).types[0])
.types[node.slice.value.n],
new_type)
return new_type
except IndexError:
raise PythranTypeError(
"Invalid tuple indexing, "
"out-of-bound index `{}` for type `{}`".format(
node.slice.value.n,
value_type),
node)
try:
unify(tr(MODULES['operator_']['getitem']),
Function([value_type, slice_type], new_type))
except InferenceError:
raise PythranTypeError(
"Invalid subscripting of `{}` by `{}`".format(
value_type,
slice_type),
node)
return new_type
return new_type
elif isinstance(node, gast.Attribute):
from pythran.utils import attr_to_path
obj, path = attr_to_path(node)
if obj.signature is typing.Any:
return TypeVariable()
else:
return tr(obj)
# stmt
elif isinstance(node, gast.Import):
for alias in node.names:
if alias.name not in MODULES:
raise NotImplementedError("unknown module: %s " % alias.name)
if alias.asname is None:
target = alias.name
else:
target = alias.asname
env[target] = tr(MODULES[alias.name])
return env
elif isinstance(node, gast.ImportFrom):
if node.module not in MODULES:
raise NotImplementedError("unknown module: %s" % node.module)
for alias in node.names:
if alias.name not in MODULES[node.module]:
raise NotImplementedError(
"unknown function: %s in %s" % (alias.name, node.module))
if alias.asname is None:
target = alias.name
else:
target = alias.asname
env[target] = tr(MODULES[node.module][alias.name])
return env
elif isinstance(node, gast.FunctionDef):
ftypes = []
for i in range(1 + len(node.args.defaults)):
new_env = env.copy()
new_non_generic = non_generic.copy()
# reset return special variables
new_env.pop('@ret', None)
new_env.pop('@gen', None)
hy = HasYield()
for stmt in node.body:
hy.visit(stmt)
new_env['@gen'] = hy.has_yield
arg_types = []
istop = len(node.args.args) - i
for arg in node.args.args[:istop]:
arg_type = TypeVariable()
new_env[arg.id] = arg_type
new_non_generic.add(arg_type)
arg_types.append(arg_type)
for arg, expr in zip(node.args.args[istop:],
node.args.defaults[-i:]):
arg_type = analyse(expr, new_env, new_non_generic)
new_env[arg.id] = arg_type
analyse_body(node.body, new_env, new_non_generic)
result_type = new_env.get('@ret', NoneType)
if new_env['@gen']:
result_type = Generator(result_type)
ftype = Function(arg_types, result_type)
ftypes.append(ftype)
if len(ftypes) == 1:
ftype = ftypes[0]
env[node.name] = ftype
else:
env[node.name] = MultiType(ftypes)
return env
elif isinstance(node, gast.Module):
analyse_body(node.body, env, non_generic)
return env
elif isinstance(node, (gast.Pass, gast.Break, gast.Continue)):
return env
elif isinstance(node, gast.Expr):
analyse(node.value, env, non_generic)
return env
elif isinstance(node, gast.Delete):
for target in node.targets:
if isinstance(target, gast.Name):
if target.id in env:
del env[target.id]
else:
raise PythranTypeError(
"Invalid del: unbound identifier `{}`".format(
target.id),
node)
else:
analyse(target, env, non_generic)
return env
elif isinstance(node, gast.Print):
if node.dest is not None:
analyse(node.dest, env, non_generic)
for value in node.values:
analyse(value, env, non_generic)
return env
elif isinstance(node, gast.Assign):
defn_type = analyse(node.value, env, non_generic)
for target in node.targets:
target_type = analyse(target, env, non_generic)
try:
unify(target_type, defn_type)
except InferenceError:
raise PythranTypeError(
"Invalid assignment from type `{}` to type `{}`".format(
target_type,
defn_type),
node)
return env
elif isinstance(node, gast.AugAssign):
# FIMXE: not optimal: evaluates type of node.value twice
fake_target = deepcopy(node.target)
fake_target.ctx = gast.Load()
fake_op = gast.BinOp(fake_target, node.op, node.value)
gast.copy_location(fake_op, node)
res_type = analyse(fake_op, env, non_generic)
target_type = analyse(node.target, env, non_generic)
try:
unify(target_type, res_type)
except InferenceError:
raise PythranTypeError(
"Invalid update operand for `{}`: `{}` and `{}`".format(
symbol_of[type(node.op)],
res_type,
target_type
),
node
)
return env
elif isinstance(node, gast.Raise):
return env # TODO
elif isinstance(node, gast.Return):
if env['@gen']:
return env
if node.value is None:
ret_type = NoneType
else:
ret_type = analyse(node.value, env, non_generic)
if '@ret' in env:
try:
ret_type = merge_unify(env['@ret'], ret_type)
except InferenceError:
raise PythranTypeError(
"function may returns with incompatible types "
"`{}` and `{}`".format(env['@ret'], ret_type),
node
)
env['@ret'] = ret_type
return env
elif isinstance(node, gast.Yield):
assert env['@gen']
assert node.value is not None
if node.value is None:
ret_type = NoneType
else:
ret_type = analyse(node.value, env, non_generic)
if '@ret' in env:
try:
ret_type = merge_unify(env['@ret'], ret_type)
except InferenceError:
raise PythranTypeError(
"function may yields incompatible types "
"`{}` and `{}`".format(env['@ret'], ret_type),
node
)
env['@ret'] = ret_type
return env
elif isinstance(node, gast.For):
iter_type = analyse(node.iter, env, non_generic)
target_type = analyse(node.target, env, non_generic)
unify(Collection(TypeVariable(), TypeVariable(), TypeVariable(),
target_type),
iter_type)
analyse_body(node.body, env, non_generic)
analyse_body(node.orelse, env, non_generic)
return env
elif isinstance(node, gast.If):
test_type = analyse(node.test, env, non_generic)
unify(Function([test_type], Bool()),
tr(MODULES['__builtin__']['bool_']))
body_env = env.copy()
body_non_generic = non_generic.copy()
if is_test_is_none(node.test):
none_id = node.test.left.id
body_env[none_id] = NoneType
else:
none_id = None
analyse_body(node.body, body_env, body_non_generic)
orelse_env = env.copy()
orelse_non_generic = non_generic.copy()
if none_id:
if is_option_type(env[none_id]):
orelse_env[none_id] = prune(env[none_id]).types[0]
else:
orelse_env[none_id] = TypeVariable()
analyse_body(node.orelse, orelse_env, orelse_non_generic)
for var in body_env:
if var not in env:
if var in orelse_env:
try:
new_type = merge_unify(body_env[var], orelse_env[var])
except InferenceError:
raise PythranTypeError(
"Incompatible types from different branches for "
"`{}`: `{}` and `{}`".format(
var,
body_env[var],
orelse_env[var]
),
node
)
else:
new_type = body_env[var]
env[var] = new_type
for var in orelse_env:
if var not in env:
# may not be unified by the prev loop if a del occured
if var in body_env:
new_type = merge_unify(orelse_env[var], body_env[var])
else:
new_type = orelse_env[var]
env[var] = new_type
if none_id:
try:
new_type = merge_unify(body_env[none_id], orelse_env[none_id])
except InferenceError:
msg = ("Inconsistent types while merging values of `{}` from "
"conditional branches: `{}` and `{}`")
err = msg.format(none_id,
body_env[none_id],
orelse_env[none_id])
raise PythranTypeError(err, node)
env[none_id] = new_type
return env
elif isinstance(node, gast.While):
test_type = analyse(node.test, env, non_generic)
unify(Function([test_type], Bool()),
tr(MODULES['__builtin__']['bool_']))
analyse_body(node.body, env, non_generic)
analyse_body(node.orelse, env, non_generic)
return env
elif isinstance(node, gast.Try):
analyse_body(node.body, env, non_generic)
for handler in node.handlers:
analyse(handler, env, non_generic)
analyse_body(node.orelse, env, non_generic)
analyse_body(node.finalbody, env, non_generic)
return env
elif isinstance(node, gast.ExceptHandler):
if(node.name):
new_type = ExceptionType
non_generic.add(new_type)
if node.name.id in env:
unify(env[node.name.id], new_type)
else:
env[node.name.id] = new_type
analyse_body(node.body, env, non_generic)
return env
elif isinstance(node, gast.Assert):
if node.msg:
analyse(node.msg, env, non_generic)
analyse(node.test, env, non_generic)
return env
elif isinstance(node, gast.UnaryOp):
operand_type = analyse(node.operand, env, non_generic)
return_type = TypeVariable()
op_type = analyse(node.op, env, non_generic)
unify(Function([operand_type], return_type), op_type)
return return_type
elif isinstance(node, gast.Invert):
return MultiType([Function([Bool()], Integer()),
Function([Integer()], Integer())])
elif isinstance(node, gast.Not):
return tr(MODULES['__builtin__']['bool_'])
elif isinstance(node, gast.BoolOp):
op_type = analyse(node.op, env, non_generic)
value_types = [analyse(value, env, non_generic)
for value in node.values]
for value_type in value_types:
unify(Function([value_type], Bool()),
tr(MODULES['__builtin__']['bool_']))
return_type = TypeVariable()
prev_type = value_types[0]
for value_type in value_types[1:]:
unify(Function([prev_type, value_type], return_type), op_type)
prev_type = value_type
return return_type
elif isinstance(node, (gast.And, gast.Or)):
x_type = TypeVariable()
return MultiType([
Function([x_type, x_type], x_type),
Function([TypeVariable(), TypeVariable()], TypeVariable()),
])
raise RuntimeError("Unhandled syntax node {0}".format(type(node)))