/usr/lib/python3/dist-packages/mypy/stats.py is in python3-mypy 0.560-1.
This file is owned by root:root, with mode 0o644.
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import cgi
import os.path
import typing
from collections import Counter
from typing import Dict, List, cast, Tuple, Optional
from mypy.traverser import TraverserVisitor
from mypy.typeanal import collect_all_inner_types
from mypy.types import (
Type, AnyType, Instance, FunctionLike, TupleType, TypeVarType, TypeQuery, CallableType,
TypeOfAny
)
from mypy import nodes
from mypy.nodes import (
Expression, FuncDef, TypeApplication, AssignmentStmt, NameExpr, CallExpr, MypyFile,
MemberExpr, OpExpr, ComparisonExpr, IndexExpr, UnaryExpr, YieldFromExpr, RefExpr, ClassDef
)
TYPE_EMPTY = 0
TYPE_UNANALYZED = 1 # type of non-typechecked code
TYPE_PRECISE = 2
TYPE_IMPRECISE = 3
TYPE_ANY = 4
precision_names = [
'empty',
'unanalyzed',
'precise',
'imprecise',
'any',
]
class StatisticsVisitor(TraverserVisitor):
def __init__(self,
inferred: bool,
filename: str,
typemap: Optional[Dict[Expression, Type]] = None,
all_nodes: bool = False,
visit_untyped_defs: bool = True) -> None:
self.inferred = inferred
self.filename = filename
self.typemap = typemap
self.all_nodes = all_nodes
self.visit_untyped_defs = visit_untyped_defs
self.num_precise_exprs = 0
self.num_imprecise_exprs = 0
self.num_any_exprs = 0
self.num_simple_types = 0
self.num_generic_types = 0
self.num_tuple_types = 0
self.num_function_types = 0
self.num_typevar_types = 0
self.num_complex_types = 0
self.num_any_types = 0
self.line = -1
self.line_map = {} # type: Dict[int, int]
self.type_of_any_counter = Counter() # type: typing.Counter[TypeOfAny]
self.any_line_map = {} # type: Dict[int, List[AnyType]]
self.output = [] # type: List[str]
TraverserVisitor.__init__(self)
def visit_func_def(self, o: FuncDef) -> None:
self.line = o.line
if len(o.expanded) > 1 and o.expanded != [o] * len(o.expanded):
if o in o.expanded:
print('{}:{}: ERROR: cycle in function expansion; skipping'.format(self.filename,
o.get_line()))
return
for defn in o.expanded:
self.visit_func_def(cast(FuncDef, defn))
else:
if o.type:
sig = cast(CallableType, o.type)
arg_types = sig.arg_types
if (sig.arg_names and sig.arg_names[0] == 'self' and
not self.inferred):
arg_types = arg_types[1:]
for arg in arg_types:
self.type(arg)
self.type(sig.ret_type)
elif self.all_nodes:
self.record_line(self.line, TYPE_ANY)
if not o.is_dynamic() or self.visit_untyped_defs:
super().visit_func_def(o)
def visit_class_def(self, o: ClassDef) -> None:
# Override this method because we don't want to analyze base_type_exprs (base_type_exprs
# are base classes in a class declaration).
# While base_type_exprs are technically expressions, type analyzer does not visit them and
# they are not in the typemap.
for d in o.decorators:
d.accept(self)
o.defs.accept(self)
def visit_type_application(self, o: TypeApplication) -> None:
self.line = o.line
for t in o.types:
self.type(t)
super().visit_type_application(o)
def visit_assignment_stmt(self, o: AssignmentStmt) -> None:
self.line = o.line
if (isinstance(o.rvalue, nodes.CallExpr) and
isinstance(o.rvalue.analyzed, nodes.TypeVarExpr)):
# Type variable definition -- not a real assignment.
return
if o.type:
self.type(o.type)
elif self.inferred and not self.all_nodes:
# if self.all_nodes is set, lvalues will be visited later
for lvalue in o.lvalues:
if isinstance(lvalue, nodes.TupleExpr):
items = lvalue.items
elif isinstance(lvalue, nodes.ListExpr):
items = lvalue.items
else:
items = [lvalue]
for item in items:
if isinstance(item, RefExpr) and item.is_inferred_def:
if self.typemap is not None:
self.type(self.typemap.get(item))
super().visit_assignment_stmt(o)
def visit_name_expr(self, o: NameExpr) -> None:
self.process_node(o)
super().visit_name_expr(o)
def visit_yield_from_expr(self, o: YieldFromExpr) -> None:
if o.expr:
o.expr.accept(self)
def visit_call_expr(self, o: CallExpr) -> None:
self.process_node(o)
if o.analyzed:
o.analyzed.accept(self)
else:
o.callee.accept(self)
for a in o.args:
a.accept(self)
def visit_member_expr(self, o: MemberExpr) -> None:
self.process_node(o)
super().visit_member_expr(o)
def visit_op_expr(self, o: OpExpr) -> None:
self.process_node(o)
super().visit_op_expr(o)
def visit_comparison_expr(self, o: ComparisonExpr) -> None:
self.process_node(o)
super().visit_comparison_expr(o)
def visit_index_expr(self, o: IndexExpr) -> None:
self.process_node(o)
super().visit_index_expr(o)
def visit_unary_expr(self, o: UnaryExpr) -> None:
self.process_node(o)
super().visit_unary_expr(o)
def process_node(self, node: Expression) -> None:
if self.all_nodes:
if self.typemap is not None:
self.line = node.line
self.type(self.typemap.get(node))
def type(self, t: Optional[Type]) -> None:
if not t:
# If an expression does not have a type, it is often due to dead code.
# Don't count these because there can be an unanalyzed value on a line with other
# analyzed expressions, which overwrite the TYPE_UNANALYZED.
self.record_line(self.line, TYPE_UNANALYZED)
return
if isinstance(t, AnyType) and t.type_of_any == TypeOfAny.special_form:
# This is not a real Any type, so don't collect stats for it.
return
if isinstance(t, AnyType):
self.log(' !! Any type around line %d' % self.line)
self.num_any_exprs += 1
self.record_line(self.line, TYPE_ANY)
elif ((not self.all_nodes and is_imprecise(t)) or
(self.all_nodes and is_imprecise2(t))):
self.log(' !! Imprecise type around line %d' % self.line)
self.num_imprecise_exprs += 1
self.record_line(self.line, TYPE_IMPRECISE)
else:
self.num_precise_exprs += 1
self.record_line(self.line, TYPE_PRECISE)
for typ in collect_all_inner_types(t) + [t]:
if isinstance(typ, AnyType):
if typ.type_of_any == TypeOfAny.from_another_any:
assert typ.source_any
assert typ.source_any.type_of_any != TypeOfAny.from_another_any
typ = typ.source_any
self.type_of_any_counter[typ.type_of_any] += 1
self.num_any_types += 1
if self.line in self.any_line_map:
self.any_line_map[self.line].append(typ)
else:
self.any_line_map[self.line] = [typ]
elif isinstance(typ, Instance):
if typ.args:
if any(is_complex(arg) for arg in typ.args):
self.num_complex_types += 1
else:
self.num_generic_types += 1
else:
self.num_simple_types += 1
elif isinstance(typ, FunctionLike):
self.num_function_types += 1
elif isinstance(typ, TupleType):
if any(is_complex(item) for item in typ.items):
self.num_complex_types += 1
else:
self.num_tuple_types += 1
elif isinstance(typ, TypeVarType):
self.num_typevar_types += 1
def log(self, string: str) -> None:
self.output.append(string)
def record_line(self, line: int, precision: int) -> None:
self.line_map[line] = max(precision,
self.line_map.get(line, TYPE_EMPTY))
def dump_type_stats(tree: MypyFile, path: str, inferred: bool = False,
typemap: Optional[Dict[Expression, Type]] = None) -> None:
if is_special_module(path):
return
print(path)
visitor = StatisticsVisitor(inferred, filename=tree.fullname(), typemap=typemap)
tree.accept(visitor)
for line in visitor.output:
print(line)
print(' ** precision **')
print(' precise ', visitor.num_precise_exprs)
print(' imprecise', visitor.num_imprecise_exprs)
print(' any ', visitor.num_any_exprs)
print(' ** kinds **')
print(' simple ', visitor.num_simple_types)
print(' generic ', visitor.num_generic_types)
print(' function ', visitor.num_function_types)
print(' tuple ', visitor.num_tuple_types)
print(' TypeVar ', visitor.num_typevar_types)
print(' complex ', visitor.num_complex_types)
print(' any ', visitor.num_any_types)
def is_special_module(path: str) -> bool:
return os.path.basename(path) in ('abc.pyi', 'typing.pyi', 'builtins.pyi')
def is_imprecise(t: Type) -> bool:
return t.accept(HasAnyQuery())
class HasAnyQuery(TypeQuery[bool]):
def __init__(self) -> None:
super().__init__(any)
def visit_any(self, t: AnyType) -> bool:
return True
def visit_instance(self, t: Instance) -> bool:
if t.type.fullname() == 'builtins.tuple':
return True
else:
return super().visit_instance(t)
def is_imprecise2(t: Type) -> bool:
return t.accept(HasAnyQuery2())
class HasAnyQuery2(HasAnyQuery):
def visit_callable_type(self, t: CallableType) -> bool:
# We don't want to flag references to functions with some Any
# argument types (etc.) since they generally don't mean trouble.
return False
def is_generic(t: Type) -> bool:
return isinstance(t, Instance) and bool(t.args)
def is_complex(t: Type) -> bool:
return is_generic(t) or isinstance(t, (FunctionLike, TupleType,
TypeVarType))
def ensure_dir_exists(dir: str) -> None:
if not os.path.exists(dir):
os.makedirs(dir)
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