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from contextlib import contextmanager
from unittest import TestCase, skipIf
import gast as ast
import beniget
import io
import sys
@contextmanager
def captured_output():
if sys.version_info.major >= 3:
new_out, new_err = io.StringIO(), io.StringIO()
else:
new_out, new_err = io.BytesIO(), io.BytesIO()
old_out, old_err = sys.stdout, sys.stderr
try:
sys.stdout, sys.stderr = new_out, new_err
yield sys.stdout, sys.stderr
finally:
sys.stdout, sys.stderr = old_out, old_err
class TestDefUseChains(TestCase):
def checkChains(self, code, ref):
class StrictDefUseChains(beniget.DefUseChains):
def unbound_identifier(self, name, node):
raise RuntimeError(
"W: unbound identifier '{}' at {}:{}".format(
name, node.lineno, node.col_offset
)
)
node = ast.parse(code)
c = StrictDefUseChains()
c.visit(node)
self.assertEqual(c.dump_chains(node), ref)
def test_simple_expression(self):
code = "a = 1; a + 2"
self.checkChains(code, ["a -> (a -> (BinOp -> ()))"])
def test_expression_chain(self):
code = "a = 1; (- a + 2) > 0"
self.checkChains(code, ["a -> (a -> (UnaryOp -> (BinOp -> (Compare -> ()))))"])
def test_ifexp_chain(self):
code = "a = 1; a + 1 if a else - a"
self.checkChains(
code,
[
"a -> ("
"a -> (IfExp -> ()), "
"a -> (BinOp -> (IfExp -> ())), "
"a -> (UnaryOp -> (IfExp -> ()))"
")"
],
)
def test_type_destructuring_tuple(self):
code = "a, b = range(2); a"
self.checkChains(code, ["a -> (a -> ())", "b -> ()"])
def test_type_destructuring_list(self):
code = "[a, b] = range(2); a"
self.checkChains(code, ["a -> (a -> ())", "b -> ()"])
def test_type_destructuring_for(self):
code = "for a, b in ((1,2), (3,4)): a"
self.checkChains(code, ["a -> (a -> ())", "b -> ()"])
def test_assign_in_loop(self):
code = "a = 2\nwhile 1: a = 1\na"
self.checkChains(code, ["a -> (a -> ())", "a -> (a -> ())"])
def test_reassign_in_loop(self):
code = "m = 1\nfor i in [1, 2]:\n m = m + 1"
self.checkChains(
code, ["m -> (m -> (BinOp -> ()))", "i -> ()", "m -> (m -> (BinOp -> ()))"]
)
def test_continue_in_loop(self):
code = "for i in [1, 2]:\n if i: m = 1; continue\n m = 1\nm"
self.checkChains(
code, ['i -> (i -> ())', 'm -> (m -> ())', 'm -> (m -> ())']
)
def test_break_in_loop(self):
code = "for i in [1, 2]:\n if i: m = 1; continue\n m = 1\nm"
self.checkChains(
code, ['i -> (i -> ())', 'm -> (m -> ())', 'm -> (m -> ())']
)
def test_augassign(self):
code = "a = 1; a += 2; a"
self.checkChains(code, ['a -> (a -> (a -> ()))'])
def test_expanded_augassign(self):
code = "a = 1; a = a + 2"
self.checkChains(code, ["a -> (a -> (BinOp -> ()))", "a -> ()"])
def test_augassign_in_loop(self):
code = "a = 1\nfor i in [1]:\n a += 2\na"
self.checkChains(code, ['a -> (a -> ((#1), a -> ()), a -> ())',
'i -> ()'])
def test_assign_in_while_in_conditional(self):
code = """
G = 1
while 1:
if 1:
G = 1
G"""
self.checkChains(code, ['G -> (G -> ())',
'G -> (G -> ())'])
def test_assign_in_loop_in_conditional(self):
code = """
G = 1
for _ in [1]:
if 1:
G = 1
G"""
self.checkChains(code, ['G -> (G -> ())',
'_ -> ()',
'G -> (G -> ())'])
def test_simple_print(self):
code = "a = 1; print(a)"
if sys.version_info.major >= 3:
self.checkChains(code, ["a -> (a -> (Call -> ()))"])
else:
self.checkChains(code, ["a -> (a -> ())"])
def test_simple_redefinition(self):
code = "a = 1; a + 2; a = 3; +a"
self.checkChains(
code, ["a -> (a -> (BinOp -> ()))", "a -> (a -> (UnaryOp -> ()))"]
)
def test_simple_for(self):
code = "for i in [1,2,3]: j = i"
self.checkChains(code, ["i -> (i -> ())", "j -> ()"])
def test_simple_for_orelse(self):
code = "for i in [1,2,3]: pass\nelse: i = 4\ni"
self.checkChains(
code,
[
# assign in loop iteration
"i -> (i -> ())",
# assign in orelse
"i -> (i -> ())",
],
)
def test_for_break(self):
code = "i = 8\nfor i in [1,2]:\n break\n i = 3\ni"
self.checkChains(
code,
['i -> (i -> ())',
'i -> (i -> ())',
'i -> ()'])
def test_for_pass(self):
code = "i = 8\nfor i in []:\n pass\ni"
self.checkChains(
code,
['i -> (i -> ())',
'i -> (i -> ())'])
def test_complex_for_orelse(self):
code = "I = J = 0\nfor i in [1,2]:\n if i < 3: I = i\nelse:\n if 1: J = I\nJ"
self.checkChains(
code,
['I -> (I -> ())',
'J -> (J -> ())',
'i -> (i -> (Compare -> ()), i -> ())',
'I -> (I -> ())',
'J -> (J -> ())']
)
def test_simple_while(self):
code = "i = 2\nwhile i: i = i - 1\ni"
self.checkChains(
code,
[
# first assign, out of loop
"i -> (i -> (), i -> (BinOp -> ()), i -> ())",
# second assign, in loop
"i -> (i -> (), i -> (BinOp -> ()), i -> ())",
],
)
def test_while_break(self):
code = "i = 8\nwhile 1:\n break\n i = 3\ni"
self.checkChains(
code,
['i -> (i -> ())',
'i -> ()'])
def test_while_cond_break(self):
code = "i = 8\nwhile 1:\n if i: i=1;break\ni"
self.checkChains(
code,
['i -> (i -> (), i -> ())', 'i -> (i -> ())'])
def test_nested_while(self):
code = '''
done = 1
while done:
while done:
if 1:
done = 1
break
if 1:
break'''
self.checkChains(
code,
['done -> (done -> (), done -> ())',
'done -> (done -> (), done -> ())']
)
def test_while_cond_continue(self):
code = "i = 8\nwhile 1:\n if i: i=1;continue\ni"
self.checkChains(
code,
['i -> (i -> (), i -> ())', 'i -> (i -> (), i -> ())'])
def test_complex_while_orelse(self):
code = "I = J = i = 0\nwhile i:\n if i < 3: I = i\nelse:\n if 1: J = I\nJ"
self.checkChains(
code,
[
"I -> (I -> ())",
"J -> (J -> ())",
"i -> (i -> (), i -> (Compare -> ()), i -> ())",
"J -> (J -> ())",
"I -> (I -> ())",
],
)
def test_while_orelse_break(self):
code = "I = 0\nwhile I:\n if 1: I = 1; break\nelse: I"
self.checkChains(
code,
['I -> (I -> (), I -> ())',
'I -> ()'],
)
def test_while_nested_break(self):
code = "i = 8\nwhile i:\n if i: break\n i = 3\ni"
self.checkChains(
code,
['i -> (i -> (), i -> (), i -> ())',
'i -> (i -> (), i -> (), i -> ())'])
def test_if_true_branch(self):
code = "if 1: i = 0\ni"
self.checkChains(code, ["i -> (i -> ())"])
def test_if_false_branch(self):
code = "if 1: pass\nelse: i = 0\ni"
self.checkChains(code, ["i -> (i -> ())"])
def test_if_both_branch(self):
code = "if 1: i = 1\nelse: i = 0\ni"
self.checkChains(code, ["i -> (i -> ())"] * 2)
def test_if_in_loop(self):
code = "for _ in [0, 1]:\n if _: i = 1\n else: j = i\ni"
self.checkChains(code, ["_ -> (_ -> ())", "i -> (i -> (), i -> ())", "j -> ()"])
def test_with_handler(self):
code = 'with open("/dev/null") as x: pass\nx'
self.checkChains(code, ["x -> (x -> ())"])
def test_simple_try(self):
code = 'try: e = open("/dev/null")\nexcept Exception: pass\ne'
self.checkChains(code, ["e -> (e -> ())"])
def test_simple_except(self):
code = "try: pass\nexcept Exception as e: pass\ne"
self.checkChains(code, ["e -> (e -> ())"])
def test_simple_try_except(self):
code = 'try: f = open("")\nexcept Exception as e: pass\ne;f'
self.checkChains(code, ["f -> (f -> ())", "e -> (e -> ())"])
def test_redef_try_except(self):
code = 'try: f = open("")\nexcept Exception as f: pass\nf'
self.checkChains(code, ["f -> (f -> ())", "f -> (f -> ())"])
def test_simple_import(self):
code = "import x; x"
self.checkChains(code, ["x -> (x -> ())"])
def test_simple_import_as(self):
code = "import x as y; y()"
self.checkChains(code, ["y -> (y -> (Call -> ()))"])
def test_multiple_import_as(self):
code = "import x as y, z; y"
self.checkChains(code, ["y -> (y -> ())", "z -> ()"])
def test_import_from(self):
code = "from y import x; x"
self.checkChains(code, ["x -> (x -> ())"])
def test_import_from_as(self):
code = "from y import x as z; z"
self.checkChains(code, ["z -> (z -> ())"])
def test_multiple_import_from_as(self):
code = "from y import x as z, w; z"
self.checkChains(code, ["z -> (z -> ())", "w -> ()"])
def test_method_function_conflict(self):
code = "def foo():pass\nclass C:\n def foo(self): foo()"
self.checkChains(code, ["foo -> (foo -> (Call -> ()))", "C -> ()"])
def test_nested_if(self):
code = "f = 1\nif 1:\n if 1:pass\n else: f=1\nelse: f = 1\nf"
self.checkChains(code, ["f -> (f -> ())", "f -> (f -> ())", "f -> (f -> ())"])
def test_nested_if_else(self):
code = "f = 1\nif 1: f = 1\nelse:\n if 1:pass\n else: f=1\nf"
self.checkChains(code, ["f -> (f -> ())", "f -> (f -> ())", "f -> (f -> ())"])
def test_try_except(self):
code = "f = 1\ntry: \n len(); f = 2\nexcept: pass\nf"
self.checkChains(code, ["f -> (f -> ())", "f -> (f -> ())"])
def test_attr(self):
code = "import numpy as bar\ndef foo():\n return bar.zeros(2)"
self.checkChains(
code, ["bar -> (bar -> (Attribute -> (Call -> ())))", "foo -> ()"]
)
def test_class_decorator(self):
code = "from some import decorator\n@decorator\nclass C:pass"
self.checkChains(code, ["decorator -> (decorator -> (C -> ()))", "C -> ()"])
@skipIf(sys.version_info.major < 3, "Python 3 syntax")
def test_functiondef_returns(self):
code = "x = 1\ndef foo() -> x: pass"
self.checkChains(code, ['x -> (x -> ())', 'foo -> ()'])
@skipIf(sys.version_info.major < 3, "Python 3 syntax")
def test_class_annotation(self):
code = "type_ = int\ndef foo(bar: type_): pass"
self.checkChains(code, ["type_ -> (type_ -> ())", "foo -> ()"])
def check_unbound_identifier_message(self, code, expected_messages, filename=None):
node = ast.parse(code)
c = beniget.DefUseChains(filename)
with captured_output() as (out, err):
c.visit(node)
produced_messages = out.getvalue().strip().split("\n")
self.assertEqual(len(expected_messages), len(produced_messages))
for expected, produced in zip(expected_messages, produced_messages):
self.assertIn(expected, produced, "actual message contains expected message")
def test_unbound_identifier_message_format(self):
code = "foo(1)\nbar(2)"
self.check_unbound_identifier_message(code, ["<unknown>:1", "<unknown>:2"])
self.check_unbound_identifier_message(code, ["foo.py:1", "foo.py:2"], filename="foo.py")
def test_star_import_with_conditional_redef(self):
code = '''
from math import *
if 1:
def pop():
cos()
cos = pop()'''
self.checkChains(code, [
'* -> (cos -> (Call -> ()))',
'pop -> (pop -> (Call -> ()))',
'cos -> (cos -> (Call -> ()))'
])
@skipIf(sys.version_info < (3, 8), 'Python 3.8 syntax')
def test_named_expr_simple(self):
code = '''
if (x := 1):
y = x + 1'''
self.checkChains(
code, ['x -> (x -> (BinOp -> ()))', 'y -> ()']
)
@skipIf(sys.version_info < (3, 8), 'Python 3.8 syntax')
def test_named_expr_complex(self):
code = '''
if (x := (y := 1) + 1):
z = x + y'''
self.checkChains(
code, ['y -> (y -> (BinOp -> ()))', 'x -> (x -> (BinOp -> ()))', 'z -> ()']
)
@skipIf(sys.version_info < (3, 8), 'Python 3.8 syntax')
def test_named_expr_with_rename(self):
code = '''
a = 1
if (a := a + a):
pass'''
self.checkChains(
code, ['a -> (a -> (BinOp -> (NamedExpr -> ())), a -> (BinOp -> (NamedExpr -> ())))', 'a -> ()']
)
class TestUseDefChains(TestCase):
def checkChains(self, code, ref):
class StrictDefUseChains(beniget.DefUseChains):
def unbound_identifier(self, name, node):
raise RuntimeError(
"W: unbound identifier '{}' at {}:{}".format(
name, node.lineno, node.col_offset
)
)
node = ast.parse(code)
c = StrictDefUseChains()
c.visit(node)
cc = beniget.UseDefChains(c)
self.assertEqual(str(cc), ref)
def test_simple_expression(self):
code = "a = 1; a"
self.checkChains(code, "a <- {a}, a <- {}")
def test_call(self):
code = "from foo import bar; bar(1, 2)"
self.checkChains(code, "Call <- {Constant, Constant, bar}, bar <- {bar}")
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