def wrapper(msg):
dbInst = DatabaseService()
gameId = 0 if (not 'gameId' in msg) else msg['gameId']
name = 0 if (not 'name' in msg) else msg['name']
gameMsg = MessageBuilder(gameId, name)
print "%s [socketio]: %s request with payload: %s" % (time.asctime(
time.localtime(time.time())), func.__name__, msg)
result = func(msg, db=dbInst, gameMsg=gameMsg)
if gameMsg.message['type'] is not 'ROOM':
storeMsg(dbInst, gameMsg)
dbInst.close()
return result
def __init__(self, errors, modules):
"""Construct a type checker. Use errors to report type check
errors. Assume symtable has been populated by the semantic
analyzer.
"""
self.expr_checker
self.errors = errors
self.modules = modules
self.msg = MessageBuilder(errors)
self.type_map = {}
self.expr_checker = checkexpr.ExpressionChecker(self, self.msg)
self.stack = [None]
self.return_types = []
self.type_context = []
self.dynamic_funcs = []
def parseMessage(messageRes):
return MessageBuilder.resultToMessage(messageRes[0], messageRes[1], json.loads(messageRes[2]), messageRes[3])
def parseMessage(messageRes):
return MessageBuilder.resultToMessage(messageRes[0], messageRes[1],
json.loads(messageRes[2]),
messageRes[3])
class TypeChecker(NodeVisitor):
"""Mypy type checker.
Type check mypy source files that have been semantically analysed.
"""
errors = None # Error reporting
symtable = None # Symbol table for the whole program
msg = None # Utility for generating messages
type_map = None # Types of type checked nodes
expr_checker = None
stack = None # Stack of local variable definitions
# None separates nested functions
return_types = None # Stack of function return types
type_context = None # Type context for type inference
dynamic_funcs = None # Flags; true for dynamically typed functions
globals = None
class_tvars = None
locals = None
modules = None
def __init__(self, errors, modules):
"""Construct a type checker. Use errors to report type check
errors. Assume symtable has been populated by the semantic
analyzer.
"""
self.expr_checker
self.errors = errors
self.modules = modules
self.msg = MessageBuilder(errors)
self.type_map = {}
self.expr_checker = checkexpr.ExpressionChecker(self, self.msg)
self.stack = [None]
self.return_types = []
self.type_context = []
self.dynamic_funcs = []
def visit_file(self, file_node, path):
"""Type check a mypy file with the given path."""
self.errors.set_file(path)
self.globals = file_node.names
self.locals = None
self.class_tvars = None
for d in file_node.defs:
self.accept(d)
def accept(self, node, type_context=None):
"""Type check a node in the given type context."""
self.type_context.append(type_context)
typ = node.accept(self)
self.type_context.pop()
self.store_type(node, typ)
if self.is_dynamic_function():
return Any()
else:
return typ
#
# Definitions
#
def visit_var_def(self, defn):
"""Type check a variable definition (of any kind: local,
member or global)."""
# Type check initializer.
if defn.init:
# There is an initializer.
if defn.items[0][1]:
# Explicit types.
if len(defn.items) == 1:
self.check_single_assignment(defn.items[0][1], None,
defn.init, defn.init)
else:
# Multiple assignment.
lvt = []
for v, t in defn.items:
lvt.append(t)
self.check_multi_assignment(
lvt, [None] * len(lvt),
defn.init, defn.init)
else:
init_type = self.accept(defn.init)
if defn.kind == LDEF and not defn.is_top_level:
# Infer local variable type if there is an initializer
# except if the# definition is at the top level (outside a
# function).
names = []
for vv, tt in defn.items:
names.append(vv)
self.infer_local_variable_type(names, init_type, defn)
else:
# No initializer
if (defn.kind == LDEF and not defn.items[0][1] and
not defn.is_top_level and not self.is_dynamic_function()):
self.fail(messages.NEED_ANNOTATION_FOR_VAR, defn)
def infer_local_variable_type(self, x, y, z):
# TODO
raise RuntimeError('Not implemented')
def visit_overloaded_func_def(self, defn):
for fdef in defn.items:
self.check_func_item(fdef)
if defn.info:
self.check_method_override(defn)
def visit_func_def(self, defn):
"""Type check a function definition."""
self.check_func_item(defn)
if defn.info:
self.check_method_override(defn)
def check_func_item(self, defn, type_override=None):
# We may be checking a function definition or an anonymous function. In
# the first case, set up another reference with the precise type.
fdef = None
if isinstance(defn, FuncDef):
fdef = defn
self.dynamic_funcs.append(defn.typ is None and not type_override)
if fdef:
self.errors.set_function(fdef.name())
typ = function_type(defn)
if type_override:
typ = type_override
if isinstance(typ, Callable):
self.check_func_def(defn, typ)
else:
raise RuntimeError('Not supported')
if fdef:
self.errors.set_function(None)
self.dynamic_funcs.pop()
def check_func_def(self, defn, typ):
"""Check a function definition."""
# We may be checking a function definition or an anonymous function. In
# the first case, set up another reference with the precise type.
if isinstance(defn, FuncDef):
fdef = defn
else:
fdef = None
self.enter()
if fdef:
# The cast below will work since non-method create will cause
# semantic analysis to fail, and type checking won't be done.
if (fdef.info and fdef.name() == '__init__' and
not isinstance((typ).ret_type, Void) and
not self.dynamic_funcs[-1]):
self.fail(messages.INIT_MUST_NOT_HAVE_RETURN_TYPE, defn.typ)
# Push return type.
self.return_types.append((typ).ret_type)
# Store argument types.
ctype = typ
nargs = len(defn.args)
for i in range(len(ctype.arg_types)):
arg_type = ctype.arg_types[i]
if ctype.arg_kinds[i] == nodes.ARG_STAR:
arg_type = self.named_generic_type('builtins.list', [arg_type])
elif ctype.arg_kinds[i] == nodes.ARG_STAR2:
arg_type = self.named_generic_type('builtins.dict',
[self.str_type(), arg_type])
defn.args[i].typ = Annotation(arg_type)
# Type check initialization expressions.
for j in range(len(defn.init)):
if defn.init[j]:
self.accept(defn.init[j])
# Type check body.
self.accept(defn.body)
# Pop return type.
self.return_types.pop()
self.leave()
def check_method_override(self, defn):
"""Check that function definition is compatible with any overridden
definitions defined in superclasses or implemented interfaces.
"""
# Check against definitions in superclass.
self.check_method_or_accessor_override_for_base(defn, defn.info.base)
# Check against definitions in implemented interfaces.
for iface in defn.info.interfaces:
self.check_method_or_accessor_override_for_base(defn, iface)
def check_method_or_accessor_override_for_base(self, defn, base):
"""Check that function definition is compatible with any overridden
definition in the specified supertype.
"""
if base:
if defn.name() != '__init__':
# Check method override (create is special).
base_method = base.get_method(defn.name())
if base_method and base_method.info == base:
# There is an overridden method in the supertype.
# Construct the type of the overriding method.
typ = method_type(defn)
# Map the overridden method type to subtype context so that
# it can be checked for compatibility. Note that multiple
# types from multiple implemented interface instances may
# be present.
original_type = map_type_from_supertype(
method_type(base_method), defn.info, base)
# Check that the types are compatible.
# TODO overloaded signatures
self.check_override(typ,
original_type,
defn.name(),
base_method.info.name(),
defn)
# Also check interface implementations.
for iface in base.interfaces:
self.check_method_or_accessor_override_for_base(defn, iface)
# We have to check that the member is compatible with all
# supertypes due to the dynamic type. Otherwise we could first
# override with dynamic and then with an arbitary type.
self.check_method_or_accessor_override_for_base(defn, base.base)
def check_override(self, override, original, name, supertype, node):
"""Check a method override with given signatures.
Arguments:
override: The signature of the overriding method.
original: The signature of the original supertype method.
name: The name of the subtype. This and the next argument are
only used for generating error messages.
supertype: The name of the supertype.
"""
if (isinstance(override, Overloaded) or
isinstance(original, Overloaded) or
len((override).arg_types) !=
len((original).arg_types) or
(override).min_args !=
(original).min_args):
if not is_subtype(override, original):
self.msg.signature_incompatible_with_supertype(
name, supertype, node)
return
else:
# Give more detailed messages for the common case of both
# signatures having the same number of arguments and no
# intersection types.
coverride = override
coriginal = original
for i in range(len(coverride.arg_types)):
if not is_equivalent(coriginal.arg_types[i],
coverride.arg_types[i]):
self.msg.argument_incompatible_with_supertype(
i + 1, name, supertype, node)
if not is_subtype(coverride.ret_type, coriginal.ret_type):
self.msg.return_type_incompatible_with_supertype(
name, supertype, node)
def visit_type_def(self, defn):
"""Type check a type definition (class or interface)."""
typ = self.lookup(defn.name, GDEF).node
self.errors.set_type(defn.name, defn.is_interface)
self.check_unique_interface_implementations(typ)
self.check_interface_errors(typ)
self.accept(defn.defs)
self.errors.set_type(None, False)
def check_unique_interface_implementations(self, typ):
"""Check that each interface is implemented only once."""
ifaces = typ.interfaces[:]
dup = find_duplicate(ifaces)
if dup:
self.msg.duplicate_interfaces(typ, dup)
return
base = typ.base
while base:
# Avoid duplicate error messages.
if find_duplicate(base.interfaces):
return
ifaces.extend(base.interfaces)
dup = find_duplicate(ifaces)
if dup:
self.msg.duplicate_interfaces(typ, dup)
return
base = base.base
def check_interface_errors(self, typ):
interfaces = typ.all_directly_implemented_interfaces()
for iface in interfaces:
for n in iface.methods.keys():
if not typ.has_method(n):
self.msg.interface_member_not_implemented(typ, iface, n)
#
# Statements
#
def visit_block(self, b):
for s in b.body:
self.accept(s)
def visit_assignment_stmt(self, s):
"""Type check an assignment statement. Handle all kinds of assignment
statements (simple, indexed, multiple).
"""
# TODO support chained assignment x = y = z
if len(s.lvalues) > 1:
self.msg.not_implemented('chained assignment', s)
self.check_assignments(self.expand_lvalues(s.lvalues[0]), s.rvalue)
def check_assignments(self, lvalues, rvalue):
# Collect lvalue types. Index lvalues require special consideration,
# since we cannot typecheck them until we know the rvalue type.
lvalue_types = [] # May be None
# Base type and index types (or None)
index_lvalue_types = []
inferred = []
is_inferred = False
for lv in lvalues:
if self.is_definition(lv):
is_inferred = True
if isinstance(lv, NameExpr):
n = lv
inferred.append((n.node))
else:
m = lv
inferred.append(m.def_var)
lvalue_types.append(None)
index_lvalue_types.append(None)
elif isinstance(lv, IndexExpr):
ilv = lv
lvalue_types.append(None)
index_lvalue_types.append((self.accept(ilv.base), ilv.index))
inferred.append(None)
else:
lvalue_types.append(self.accept(lv))
index_lvalue_types.append(None)
inferred.append(None)
if len(lvalues) == 1:
# Single lvalue.
self.check_single_assignment(lvalue_types[0],
index_lvalue_types[0], rvalue, rvalue)
else:
self.check_multi_assignment(lvalue_types, index_lvalue_types,
rvalue, rvalue)
if is_inferred:
self.infer_variable_type(inferred, self.accept(rvalue), rvalue)
def is_definition(self, s):
return ((isinstance(s, NameExpr) or isinstance(s, MemberExpr)) and
s.is_def)
def expand_lvalues(self, n):
if isinstance(n, TupleExpr):
return self.expr_checker.unwrap_list((n).items)
elif isinstance(n, ListExpr):
return self.expr_checker.unwrap_list((n).items)
elif isinstance(n, ParenExpr):
return self.expand_lvalues((n).expr)
else:
return [n]
def infer_variable_type(self, names, init_type, context):
"""Infer the type of initialized variables from the type of the
initializer expression.
"""
if isinstance(init_type, Void):
self.check_not_void(init_type, context)
elif not self.is_valid_inferred_type(init_type):
# We cannot use the type of the initialization expression for type
# inference (it's not specific enough).
self.fail(messages.NEED_ANNOTATION_FOR_VAR, context)
else:
# Infer type of the target.
# Make the type more general (strip away function names etc.).
init_type = self.strip_type(init_type)
if len(names) > 1:
if isinstance(init_type, TupleType):
tinit_type = init_type
# Initializer with a tuple type.
if len(tinit_type.items) == len(names):
for i in range(len(names)):
if names[i]:
names[i].typ = Annotation(tinit_type.items[i],
-1)
else:
self.msg.incompatible_value_count_in_assignment(
len(names), len(tinit_type.items), context)
elif (isinstance(init_type, Instance) and
(init_type).typ.full_name() ==
'builtins.list'):
# Initializer with an array type.
item_type = (init_type).args[0]
for j in range(len(names)):
if names[j]:
names[j].typ = Annotation(item_type, -1)
elif isinstance(init_type, Any):
for k in range(len(names)):
if names[k]:
names[k].typ = Annotation(Any(), -1)
else:
self.fail(messages.INCOMPATIBLE_TYPES_IN_ASSIGNMENT,
context)
else:
for v in names:
v.typ = Annotation(init_type, -1)
def is_valid_inferred_type(self, typ):
"""Is an inferred type invalid?
Examples include the None type or a type with a None component.
"""
if is_same_type(typ, NoneTyp()):
return False
elif isinstance(typ, Instance):
for arg in (typ).args:
if not self.is_valid_inferred_type(arg):
return False
elif isinstance(typ, TupleType):
for item in (typ).items:
if not self.is_valid_inferred_type(item):
return False
return True
def strip_type(self, typ):
"""Return a copy of type with all 'debugging information' (e.g. name of
function) removed.
"""
if isinstance(typ, Callable):
ctyp = typ
return Callable(ctyp.arg_types,
ctyp.arg_kinds,
ctyp.arg_names,
ctyp.ret_type,
ctyp.is_type_obj(),
None,
ctyp.variables)
else:
return typ
def check_multi_assignment(self, lvalue_types, index_lvalue_types, rvalue, context, msg=None):
if not msg:
msg = messages.INCOMPATIBLE_TYPES_IN_ASSIGNMENT
rvalue_type = self.accept(rvalue) # TODO maybe elsewhere; redundant
# Try to expand rvalue to lvalue(s).
if isinstance(rvalue_type, Any):
pass
elif isinstance(rvalue_type, TupleType):
# Rvalue with tuple type.
trvalue = rvalue_type
items = []
for i in range(len(lvalue_types)):
if lvalue_types[i]:
items.append(lvalue_types[i])
elif i < len(trvalue.items):
# TODO Figure out more precise type context, probably
# based on the type signature of the _set method.
items.append(trvalue.items[i])
trvalue = (self.accept(rvalue, TupleType(items)))
if len(trvalue.items) != len(lvalue_types):
self.msg.incompatible_value_count_in_assignment(
len(lvalue_types), len(trvalue.items), context)
else:
# The number of values is compatible. Check their types.
for j in range(len(lvalue_types)):
self.check_single_assignment(
lvalue_types[j], index_lvalue_types[j],
self.temp_node(trvalue.items[j]), context, msg)
elif (isinstance(rvalue_type, Instance) and
(rvalue_type).typ.full_name() == 'builtins.list'):
# Rvalue with list type.
item_type = (rvalue_type).args[0]
for k in range(len(lvalue_types)):
self.check_single_assignment(lvalue_types[k],
index_lvalue_types[k],
self.temp_node(item_type),
context, msg)
else:
self.fail(msg, context)
def check_single_assignment(self, lvalue_type, index_lvalue, rvalue, context, msg=messages.INCOMPATIBLE_TYPES_IN_ASSIGNMENT):
if lvalue_type:
rvalue_type = self.accept(rvalue, lvalue_type)
self.check_subtype(rvalue_type, lvalue_type, context, msg)
elif index_lvalue:
self.check_indexed_assignment(index_lvalue, rvalue, context)
def check_indexed_assignment(self, lvalue, rvalue, context):
"""Type check indexed assignment base[index] = rvalue.
The lvalue argument is the tuple (base type, index) and rvalue is the
assigned expression.
"""
method_type = self.expr_checker.analyse_external_member_access(
'__setitem__', lvalue[0], context)
return self.expr_checker.check_call(method_type, [lvalue[1], rvalue],
[nodes.ARG_POS, nodes.ARG_POS],
context)
def visit_expression_stmt(self, s):
self.accept(s.expr)
def visit_return_stmt(self, s):
"""Type check a return statement."""
if self.is_within_function():
if s.expr:
# Return with a value.
typ = self.accept(s.expr, self.return_types[-1])
# Returning a value of type dynamic is always fine.
if not isinstance(typ, Any):
if isinstance(self.return_types[-1], Void):
self.fail(messages.NO_RETURN_VALUE_EXPECTED, s)
else:
self.check_subtype(
typ, self.return_types[-1], s,
messages.INCOMPATIBLE_RETURN_VALUE_TYPE)
else:
# Return without a value.
if (not isinstance(self.return_types[-1], Void) and
not self.is_dynamic_function()):
self.fail(messages.RETURN_VALUE_EXPECTED, s)
def visit_yield_stmt(self, s):
return_type = self.return_types[-1]
if isinstance(return_type, Instance):
inst = return_type
if inst.typ.full_name() != 'builtins.Iterator':
self.fail(messages.INVALID_RETURN_TYPE_FOR_YIELD, s)
return None
expected_item_type = inst.args[0]
elif isinstance(return_type, Any):
expected_item_type = Any()
else:
self.fail(messages.INVALID_RETURN_TYPE_FOR_YIELD, s)
return None
actual_item_type = self.accept(s.expr, expected_item_type)
self.check_subtype(actual_item_type, expected_item_type, s)
def visit_if_stmt(self, s):
"""Type check an if statement."""
for e in s.expr:
t = self.accept(e)
self.check_not_void(t, e)
for b in s.body:
self.accept(b)
if s.else_body:
self.accept(s.else_body)
def visit_while_stmt(self, s):
"""Type check a while statement."""
t = self.accept(s.expr)
self.check_not_void(t, s)
self.accept(s.body)
if s.else_body:
self.accept(s.else_body)
def visit_operator_assignment_stmt(self, s):
"""Type check an operator assignment statement, e.g. x += 1."""
lvalue_type = self.accept(s.lvalue)
rvalue_type = self.expr_checker.check_op(op_methods[s.op], lvalue_type,
s.rvalue, s)
if isinstance(s.lvalue, IndexExpr):
lv = s.lvalue
self.check_single_assignment(None,
(self.accept(lv.base), lv.index),
s.rvalue, s.rvalue)
else:
if not is_subtype(rvalue_type, lvalue_type):
self.msg.incompatible_operator_assignment(s.op, s)
def visit_assert_stmt(self, s):
self.accept(s.expr)
def visit_raise_stmt(self, s):
"""Type check a raise statement."""
typ = self.accept(s.expr)
self.check_subtype(typ, self.named_type('builtins.BaseException'), s,
messages.INVALID_EXCEPTION_TYPE)
def visit_try_stmt(self, s):
"""Type check a try statement."""
self.accept(s.body)
for i in range(len(s.handlers)):
if s.types[i]:
t = self.exception_type(s.types[i])
if s.vars[i]:
s.vars[i].typ = Annotation(t)
self.accept(s.handlers[i])
if s.finally_body:
self.accept(s.finally_body)
if s.else_body:
self.accept(s.else_body)
def exception_type(self, n):
if isinstance(n, NameExpr):
name = n
if isinstance(name.node, TypeInfo):
return self.check_exception_type(name.node, n)
elif isinstance(n, MemberExpr):
m = n
if isinstance(m.node, TypeInfo):
return self.check_exception_type(m.node, n)
elif isinstance(self.expr_checker.unwrap(n), TupleExpr):
self.fail('Multiple exception types not supported yet', n)
return Any()
self.fail('Unsupported exception', n)
return Any()
def check_exception_type(self, info, context):
t = Instance(info, [])
if is_subtype(t, self.named_type('builtins.BaseException')):
return t
else:
self.fail(messages.INVALID_EXCEPTION_TYPE, context)
return Any()
def visit_for_stmt(self, s):
"""Type check a for statement."""
item_type = self.analyse_iterable_item_type(s.expr)
self.analyse_index_variables(s.index, s.is_annotated(), item_type, s)
self.accept(s.body)
def analyse_iterable_item_type(self, expr):
"""Analyse iterable expression and return iterator item type."""
iterable = self.accept(expr)
self.check_not_void(iterable, expr)
self.check_subtype(iterable,
self.named_generic_type('builtins.Iterable',
[Any()]),
expr, messages.ITERABLE_EXPECTED)
echk = self.expr_checker
method = echk.analyse_external_member_access('__iter__', iterable,
expr)
iterator = echk.check_call(method, [], [], expr)
method = echk.analyse_external_member_access('__next__', iterator,
expr)
return echk.check_call(method, [], [], expr)
def analyse_index_variables(self, index, is_annotated, item_type, context):
"""Type check or infer for loop or list comprehension index vars."""
if not is_annotated:
# Create a temporary copy of variables with Node item type.
# TODO this is ugly
node_index = []
for i in index:
node_index.append(i)
self.check_assignments(node_index,
self.temp_node(item_type, context))
elif len(index) == 1:
v = index[0].node
if v.typ:
self.check_single_assignment(v.typ.typ, None,
self.temp_node(item_type), context,
messages.INCOMPATIBLE_TYPES_IN_FOR)
else:
t = []
for ii in index:
v = ii.node
if v.typ:
t.append(v.typ.typ)
else:
t.append(Any())
self.check_multi_assignment(
t, [None] * len(index),
self.temp_node(item_type), context,
messages.INCOMPATIBLE_TYPES_IN_FOR)
def visit_del_stmt(self, s):
if isinstance(s.expr, IndexExpr):
e = s.expr # Cast
m = MemberExpr(e.base, '__delitem__')
m.line = s.line
c = CallExpr(m, [e.index], [nodes.ARG_POS], [None])
c.line = s.line
return c.accept(self)
else:
return None # this case is handled in semantical analysis
#
# Expressions
#
def visit_name_expr(self, e):
return self.expr_checker.visit_name_expr(e)
def visit_paren_expr(self, e):
return self.expr_checker.visit_paren_expr(e)
def visit_call_expr(self, e):
return self.expr_checker.visit_call_expr(e)
def visit_member_expr(self, e):
return self.expr_checker.visit_member_expr(e)
def visit_int_expr(self, e):
return self.expr_checker.visit_int_expr(e)
def visit_str_expr(self, e):
return self.expr_checker.visit_str_expr(e)
def visit_bytes_expr(self, e):
return self.expr_checker.visit_bytes_expr(e)
def visit_float_expr(self, e):
return self.expr_checker.visit_float_expr(e)
def visit_op_expr(self, e):
return self.expr_checker.visit_op_expr(e)
def visit_unary_expr(self, e):
return self.expr_checker.visit_unary_expr(e)
def visit_index_expr(self, e):
return self.expr_checker.visit_index_expr(e)
def visit_cast_expr(self, e):
return self.expr_checker.visit_cast_expr(e)
def visit_super_expr(self, e):
return self.expr_checker.visit_super_expr(e)
def visit_type_application(self, e):
return self.expr_checker.visit_type_application(e)
def visit_list_expr(self, e):
return self.expr_checker.visit_list_expr(e)
def visit_tuple_expr(self, e):
return self.expr_checker.visit_tuple_expr(e)
def visit_dict_expr(self, e):
return self.expr_checker.visit_dict_expr(e)
def visit_slice_expr(self, e):
return self.expr_checker.visit_slice_expr(e)
def visit_func_expr(self, e):
return self.expr_checker.visit_func_expr(e)
def visit_list_comprehension(self, e):
return self.expr_checker.visit_list_comprehension(e)
def visit_generator_expr(self, e):
return self.expr_checker.visit_generator_expr(e)
def visit_temp_node(self, e):
return e.typ
#
# Currently unsupported features
#
def visit_set_expr(self, e):
return self.msg.not_implemented('set literal', e)
def visit_conditional_expr(self, e):
return self.msg.not_implemented('conditional expression', e)
def visit_decorator(self, e):
return self.msg.not_implemented('decorator', e)
def visit_with_stmt(self, s):
self.msg.not_implemented('with statement', s)
#
# Helpers
#
def check_subtype(self, subtype, supertype, context, msg=messages.INCOMPATIBLE_TYPES):
"""Generate an error if the subtype is not compatible with
supertype."""
if not is_subtype(subtype, supertype):
if isinstance(subtype, Void):
self.msg.does_not_return_value(subtype, context)
else:
self.fail(msg, context)
def named_type(self, name):
"""Return an instance type with type given by the name and no
type arguments. For example, named_type('builtins.object')
produces the object type.
"""
# Assume that the name refers to a type.
sym = self.lookup_qualified(name)
return Instance(sym.node, [])
def named_type_if_exists(self, name):
"""Return named instance type, or UnboundType if the type was
not defined.
This is used to simplify test cases by avoiding the need to
define basic types not needed in specific test cases (tuple
etc.).
"""
try:
# Assume that the name refers to a type.
sym = self.lookup_qualified(name)
return Instance(sym.node, [])
except KeyError:
return UnboundType(name)
def named_generic_type(self, name, args):
"""Return an instance with the given name and type
arguments. Assume that the number of arguments is correct.
"""
# Assume that the name refers to a compatible generic type.
sym = self.lookup_qualified(name)
return Instance(sym.node, args)
def type_type(self):
"""Return instance type 'type'."""
return self.named_type('builtins.type')
def object_type(self):
"""Return instance type 'object'."""
return self.named_type('builtins.object')
def bool_type(self):
"""Return instance type 'bool'."""
return self.named_type('builtins.bool')
def str_type(self):
"""Return instance type 'str'."""
return self.named_type('builtins.str')
def tuple_type(self):
"""Return instance type 'tuple'."""
# We need the tuple for analysing member access. We want to be able to
# do this even if tuple type is not available (useful in test cases),
# so we return an unbound type if there is no tuple type.
return self.named_type_if_exists('builtins.tuple')
def check_type_equivalency(self, t1, t2, node, msg=messages.INCOMPATIBLE_TYPES):
"""Generate an error if the types are not equivalent. The
dynamic type is equivalent with all types.
"""
if not is_equivalent(t1, t2):
self.fail(msg, node)
def store_type(self, node, typ):
"""Store the type of a node in the type map."""
self.type_map[node] = typ
def is_dynamic_function(self):
return len(self.dynamic_funcs) > 0 and self.dynamic_funcs[-1]
def lookup(self, name, kind):
"""Look up a definition from the symbol table with the given name.
TODO remove kind argument
"""
if self.locals is not None and name in self.locals:
return self.locals[name]
elif self.class_tvars is not None and name in self.class_tvars:
return self.class_tvars[name]
elif name in self.globals:
return self.globals[name]
else:
b = self.globals.get('__builtins__', None)
if b:
table = (b.node).names
if name in table:
return table[name]
raise KeyError('Failed lookup: {}'.format(name))
def lookup_qualified(self, name):
if '.' not in name:
return self.lookup(name, GDEF) # FIX kind
else:
parts = name.split('.')
n = self.modules[parts[0]]
for i in range(1, len(parts) - 1):
n = ((n.names.get(parts[i], None).node))
return n.names[parts[-1]]
def enter(self):
self.locals = SymbolTable()
def leave(self):
self.locals = None
def basic_types(self):
"""Return a BasicTypes instance that contains primitive types that are
needed for certain type operations (joins, for example).
"""
# TODO function type
return BasicTypes(self.object_type(), self.type_type(),
self.named_type_if_exists('builtins.tuple'),
self.named_type_if_exists('builtins.function'))
def is_within_function(self):
"""Are we currently type checking within a function (i.e. not
at class body or at the top level)?
"""
return self.return_types != []
def check_not_void(self, typ, context):
"""Generate an error if the type is Void."""
if isinstance(typ, Void):
self.msg.does_not_return_value(typ, context)
def temp_node(self, t, context=None):
"""Create a temporary node with the given, fixed type."""
temp = TempNode(t)
if context:
temp.set_line(context.get_line())
return temp
def fail(self, msg, context):
"""Produce an error message."""
self.msg.fail(msg, context)
