cpython/Lib/test/test_ast.py at a95c6f73fa5daadfe882242261a697cf7f468058 · encukou/cpython

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import ast

import dis

import os

import sys

import unittest

import warnings

import weakref

from textwrap import dedent

from test import support

def to_tuple(t):

if t is None or isinstance(t, (str, int, complex)):

return t

elif isinstance(t, list):

return [to_tuple(e) for e in t]

result = [t.__class__.__name__]

if hasattr(t, 'lineno') and hasattr(t, 'col_offset'):

result.append((t.lineno, t.col_offset))

if hasattr(t, 'end_lineno') and hasattr(t, 'end_col_offset'):

result[-1] += (t.end_lineno, t.end_col_offset)

if t._fields is None:

return tuple(result)

for f in t._fields:

result.append(to_tuple(getattr(t, f)))

return tuple(result)

# These tests are compiled through "exec"

# There should be at least one test per statement

exec_tests = [

# None

"None",

# Module docstring

"'module docstring'",

# FunctionDef

"def f(): pass",

# FunctionDef with docstring

"def f(): 'function docstring'",

# FunctionDef with arg

"def f(a): pass",

# FunctionDef with arg and default value

"def f(a=0): pass",

# FunctionDef with varargs

"def f(*args): pass",

# FunctionDef with kwargs

"def f(**kwargs): pass",

# FunctionDef with all kind of args and docstring

"def f(a, b=1, c=None, d=[], e={}, *args, f=42, **kwargs): 'doc for f()'",

# ClassDef

"class C:pass",

# ClassDef with docstring

"class C: 'docstring for class C'",

# ClassDef, new style class

"class C(object): pass",

# Return

"def f():return 1",

# Delete

"del v",

# Assign

"v = 1",

"a,b = c",

"(a,b) = c",

"[a,b] = c",

# AugAssign

"v += 1",

# For

"for v in v:pass",

# While

"while v:pass",

# If

"if v:pass",

# If-Elif

"if a:\n pass\nelif b:\n pass",

# If-Elif-Else

"if a:\n pass\nelif b:\n pass\nelse:\n pass",

# With

"with x as y: pass",

"with x as y, z as q: pass",

# Raise

"raise Exception('string')",

# TryExcept

"try:\n pass\nexcept Exception:\n pass",

# TryFinally

"try:\n pass\nfinally:\n pass",

# Assert

"assert v",

# Import

"import sys",

# ImportFrom

"from sys import v",

# Global

"global v",

# Expr

"1",

# Pass,

"pass",

# Break

"for v in v:break",

# Continue

"for v in v:continue",

# for statements with naked tuples (see http://bugs.python.org/issue6704)

"for a,b in c: pass",

"for (a,b) in c: pass",

"for [a,b] in c: pass",

# Multiline generator expression (test for .lineno & .col_offset)

"""(

(

)

for

Bb in Cc

)""",

# dictcomp

"{a : b for w in x for m in p if g}",

# dictcomp with naked tuple

"{a : b for v,w in x}",

# setcomp

"{r for l in x if g}",

# setcomp with naked tuple

"{r for l,m in x}",

# AsyncFunctionDef

"async def f():\n 'async function'\n await something()",

# AsyncFor

"async def f():\n async for e in i: 1\n else: 2",

# AsyncWith

"async def f():\n async with a as b: 1",

# PEP 448: Additional Unpacking Generalizations

"{**{1:2}, 2:3}",

"{*{1, 2}, 3}",

# Asynchronous comprehensions

"async def f():\n [i async for b in c]",

# Decorated FunctionDef

"@deco1\n@deco2()\n@deco3(1)\ndef f(): pass",

# Decorated AsyncFunctionDef

"@deco1\n@deco2()\n@deco3(1)\nasync def f(): pass",

# Decorated ClassDef

"@deco1\n@deco2()\n@deco3(1)\nclass C: pass",

# Decorator with generator argument

"@deco(a for a in b)\ndef f(): pass",

# Decorator with attribute

"@a.b.c\ndef f(): pass",

# Simple assignment expression

"(a := 1)",

# Positional-only arguments

"def f(a, /,): pass",

"def f(a, /, c, d, e): pass",

"def f(a, /, c, *, d, e): pass",

"def f(a, /, c, *, d, e, **kwargs): pass",

# Positional-only arguments with defaults

"def f(a=1, /,): pass",

"def f(a=1, /, b=2, c=4): pass",

"def f(a=1, /, b=2, *, c=4): pass",

"def f(a=1, /, b=2, *, c): pass",

"def f(a=1, /, b=2, *, c=4, **kwargs): pass",

"def f(a=1, /, b=2, *, c, **kwargs): pass",

]

# These are compiled through "single"

# because of overlap with "eval", it just tests what

# can't be tested with "eval"

single_tests = [

"1+2"

]

# These are compiled through "eval"

# It should test all expressions

eval_tests = [

# None

"None",

# BoolOp

"a and b",

# BinOp

"a + b",

# UnaryOp

"not v",

# Lambda

"lambda:None",

# Dict

"{ 1:2 }",

# Empty dict

"{}",

# Set

"{None,}",

# Multiline dict (test for .lineno & .col_offset)

"""{

}""",

# ListComp

"[a for b in c if d]",

# GeneratorExp

"(a for b in c if d)",

# Comprehensions with multiple for targets

"[(a,b) for a,b in c]",

"[(a,b) for (a,b) in c]",

"[(a,b) for [a,b] in c]",

"{(a,b) for a,b in c}",

"{(a,b) for (a,b) in c}",

"{(a,b) for [a,b] in c}",

"((a,b) for a,b in c)",

"((a,b) for (a,b) in c)",

"((a,b) for [a,b] in c)",

# Yield - yield expressions can't work outside a function

# Compare

"1 < 2 < 3",

# Call

"f(1,2,c=3,*d,**e)",

# Call with multi-character starred

"f(*[0, 1])",

# Call with a generator argument

"f(a for a in b)",

# Num

"10",

# Str

"'string'",

# Attribute

"a.b",

# Subscript

"a[b:c]",

# Name

"v",

# List

"[1,2,3]",

# Empty list

"[]",

# Tuple

"1,2,3",

# Tuple

"(1,2,3)",

# Empty tuple

"()",

# Combination

"a.b.c.d(a.b[1:2])",

]

# TODO: expr_context, slice, boolop, operator, unaryop, cmpop, comprehension

# excepthandler, arguments, keywords, alias

class AST_Tests(unittest.TestCase):

def _is_ast_node(self, name, node):

if not isinstance(node, type):

return False

if "ast" not in node.__module__:

return False

return name != 'AST' and name[0].isupper()

def _assertTrueorder(self, ast_node, parent_pos):

if not isinstance(ast_node, ast.AST) or ast_node._fields is None:

return

if isinstance(ast_node, (ast.expr, ast.stmt, ast.excepthandler)):

node_pos = (ast_node.lineno, ast_node.col_offset)

self.assertGreaterEqual(node_pos, parent_pos)

parent_pos = (ast_node.lineno, ast_node.col_offset)

for name in ast_node._fields:

value = getattr(ast_node, name)

if isinstance(value, list):

first_pos = parent_pos

if value and name == 'decorator_list':

first_pos = (value[0].lineno, value[0].col_offset)

for child in value:

self._assertTrueorder(child, first_pos)

elif value is not None:

self._assertTrueorder(value, parent_pos)

def test_AST_objects(self):

x = ast.AST()

self.assertEqual(x._fields, ())

x.foobar = 42

self.assertEqual(x.foobar, 42)

self.assertEqual(x.__dict__["foobar"], 42)

with self.assertRaises(AttributeError):

x.vararg

with self.assertRaises(TypeError):

# "ast.AST constructor takes 0 positional arguments"

ast.AST(2)

def test_AST_garbage_collection(self):

class X:

pass

a = ast.AST()

a.x = X()

a.x.a = a

ref = weakref.ref(a.x)

del a

support.gc_collect()

self.assertIsNone(ref())

def test_snippets(self):

for input, output, kind in ((exec_tests, exec_results, "exec"),

(single_tests, single_results, "single"),

(eval_tests, eval_results, "eval")):

for i, o in zip(input, output):

with self.subTest(action="parsing", input=i):

ast_tree = compile(i, "?", kind, ast.PyCF_ONLY_AST)

self.assertEqual(to_tuple(ast_tree), o)

self._assertTrueorder(ast_tree, (0, 0))

with self.subTest(action="compiling", input=i, kind=kind):

compile(ast_tree, "?", kind)

def test_ast_validation(self):

# compile() is the only function that calls PyAST_Validate

snippets_to_validate = exec_tests + single_tests + eval_tests

for snippet in snippets_to_validate:

tree = ast.parse(snippet)

compile(tree, '<string>', 'exec')

def test_slice(self):

slc = ast.parse("x[::]").body[0].value.slice

self.assertIsNone(slc.upper)

self.assertIsNone(slc.lower)

self.assertIsNone(slc.step)

def test_from_import(self):

im = ast.parse("from . import y").body[0]

self.assertIsNone(im.module)

def test_non_interned_future_from_ast(self):

mod = ast.parse("from __future__ import division")

self.assertIsInstance(mod.body[0], ast.ImportFrom)

mod.body[0].module = " __future__ ".strip()

compile(mod, "<test>", "exec")

def test_base_classes(self):

self.assertTrue(issubclass(ast.For, ast.stmt))

self.assertTrue(issubclass(ast.Name, ast.expr))

self.assertTrue(issubclass(ast.stmt, ast.AST))

self.assertTrue(issubclass(ast.expr, ast.AST))

self.assertTrue(issubclass(ast.comprehension, ast.AST))

self.assertTrue(issubclass(ast.Gt, ast.AST))

def test_field_attr_existence(self):

for name, item in ast.__dict__.items():

if self._is_ast_node(name, item):

if name == 'Index':

# Index(value) just returns value now.

# The argument is required.

continue

x = item()

if isinstance(x, ast.AST):

self.assertEqual(type(x._fields), tuple)

def test_arguments(self):

x = ast.arguments()

self.assertEqual(x._fields, ('posonlyargs', 'args', 'vararg', 'kwonlyargs',

'kw_defaults', 'kwarg', 'defaults'))

with self.assertRaises(AttributeError):

x.args

self.assertIsNone(x.vararg)

x = ast.arguments(*range(1, 8))

self.assertEqual(x.args, 2)

self.assertEqual(x.vararg, 3)

def test_field_attr_writable(self):

x = ast.Num()

# We can assign to _fields

x._fields = 666

self.assertEqual(x._fields, 666)

def test_classattrs(self):

x = ast.Num()

self.assertEqual(x._fields, ('value', 'kind'))

with self.assertRaises(AttributeError):

x.value

with self.assertRaises(AttributeError):

x.n

x = ast.Num(42)

self.assertEqual(x.value, 42)

self.assertEqual(x.n, 42)

with self.assertRaises(AttributeError):

x.lineno

with self.assertRaises(AttributeError):

x.foobar

x = ast.Num(lineno=2)

self.assertEqual(x.lineno, 2)

x = ast.Num(42, lineno=0)

self.assertEqual(x.lineno, 0)

self.assertEqual(x._fields, ('value', 'kind'))

self.assertEqual(x.value, 42)

self.assertEqual(x.n, 42)

self.assertRaises(TypeError, ast.Num, 1, None, 2)

self.assertRaises(TypeError, ast.Num, 1, None, 2, lineno=0)

# Arbitrary keyword arguments are supported

self.assertEqual(ast.Constant(1, foo='bar').foo, 'bar')

self.assertEqual(ast.Num(1, foo='bar').foo, 'bar')

with self.assertRaisesRegex(TypeError, "Num got multiple values for argument 'n'"):

ast.Num(1, n=2)

with self.assertRaisesRegex(TypeError, "Constant got multiple values for argument 'value'"):

ast.Constant(1, value=2)

self.assertEqual(ast.Num(42).n, 42)

self.assertEqual(ast.Num(4.25).n, 4.25)

self.assertEqual(ast.Num(4.25j).n, 4.25j)

self.assertEqual(ast.Str('42').s, '42')

self.assertEqual(ast.Bytes(b'42').s, b'42')

self.assertIs(ast.NameConstant(True).value, True)

self.assertIs(ast.NameConstant(False).value, False)

self.assertIs(ast.NameConstant(None).value, None)

self.assertEqual(ast.Constant(42).value, 42)

self.assertEqual(ast.Constant(4.25).value, 4.25)

self.assertEqual(ast.Constant(4.25j).value, 4.25j)

self.assertEqual(ast.Constant('42').value, '42')

self.assertEqual(ast.Constant(b'42').value, b'42')

self.assertIs(ast.Constant(True).value, True)

self.assertIs(ast.Constant(False).value, False)

self.assertIs(ast.Constant(None).value, None)

self.assertIs(ast.Constant(...).value, ...)

def test_realtype(self):

self.assertEqual(type(ast.Num(42)), ast.Constant)

self.assertEqual(type(ast.Num(4.25)), ast.Constant)

self.assertEqual(type(ast.Num(4.25j)), ast.Constant)

self.assertEqual(type(ast.Str('42')), ast.Constant)

self.assertEqual(type(ast.Bytes(b'42')), ast.Constant)

self.assertEqual(type(ast.NameConstant(True)), ast.Constant)

self.assertEqual(type(ast.NameConstant(False)), ast.Constant)

self.assertEqual(type(ast.NameConstant(None)), ast.Constant)

self.assertEqual(type(ast.Ellipsis()), ast.Constant)

def test_isinstance(self):

self.assertTrue(isinstance(ast.Num(42), ast.Num))

self.assertTrue(isinstance(ast.Num(4.2), ast.Num))

self.assertTrue(isinstance(ast.Num(4.2j), ast.Num))

self.assertTrue(isinstance(ast.Str('42'), ast.Str))

self.assertTrue(isinstance(ast.Bytes(b'42'), ast.Bytes))

self.assertTrue(isinstance(ast.NameConstant(True), ast.NameConstant))

self.assertTrue(isinstance(ast.NameConstant(False), ast.NameConstant))

self.assertTrue(isinstance(ast.NameConstant(None), ast.NameConstant))

self.assertTrue(isinstance(ast.Ellipsis(), ast.Ellipsis))

self.assertTrue(isinstance(ast.Constant(42), ast.Num))

self.assertTrue(isinstance(ast.Constant(4.2), ast.Num))

self.assertTrue(isinstance(ast.Constant(4.2j), ast.Num))

self.assertTrue(isinstance(ast.Constant('42'), ast.Str))

self.assertTrue(isinstance(ast.Constant(b'42'), ast.Bytes))

self.assertTrue(isinstance(ast.Constant(True), ast.NameConstant))

self.assertTrue(isinstance(ast.Constant(False), ast.NameConstant))

self.assertTrue(isinstance(ast.Constant(None), ast.NameConstant))

self.assertTrue(isinstance(ast.Constant(...), ast.Ellipsis))

self.assertFalse(isinstance(ast.Str('42'), ast.Num))

self.assertFalse(isinstance(ast.Num(42), ast.Str))

self.assertFalse(isinstance(ast.Str('42'), ast.Bytes))

self.assertFalse(isinstance(ast.Num(42), ast.NameConstant))

self.assertFalse(isinstance(ast.Num(42), ast.Ellipsis))

self.assertFalse(isinstance(ast.NameConstant(True), ast.Num))

self.assertFalse(isinstance(ast.NameConstant(False), ast.Num))

self.assertFalse(isinstance(ast.Constant('42'), ast.Num))

self.assertFalse(isinstance(ast.Constant(42), ast.Str))

self.assertFalse(isinstance(ast.Constant('42'), ast.Bytes))

self.assertFalse(isinstance(ast.Constant(42), ast.NameConstant))

self.assertFalse(isinstance(ast.Constant(42), ast.Ellipsis))

self.assertFalse(isinstance(ast.Constant(True), ast.Num))

self.assertFalse(isinstance(ast.Constant(False), ast.Num))

self.assertFalse(isinstance(ast.Constant(), ast.Num))

self.assertFalse(isinstance(ast.Constant(), ast.Str))

self.assertFalse(isinstance(ast.Constant(), ast.Bytes))

self.assertFalse(isinstance(ast.Constant(), ast.NameConstant))

self.assertFalse(isinstance(ast.Constant(), ast.Ellipsis))

class S(str): pass

self.assertTrue(isinstance(ast.Constant(S('42')), ast.Str))

self.assertFalse(isinstance(ast.Constant(S('42')), ast.Num))

def test_subclasses(self):

class N(ast.Num):

def __init__(self, *args, **kwargs):

super().__init__(*args, **kwargs)

self.z = 'spam'

class N2(ast.Num):

pass

n = N(42)

self.assertEqual(n.n, 42)

self.assertEqual(n.z, 'spam')

self.assertEqual(type(n), N)

self.assertTrue(isinstance(n, N))

self.assertTrue(isinstance(n, ast.Num))

self.assertFalse(isinstance(n, N2))

self.assertFalse(isinstance(ast.Num(42), N))

n = N(n=42)

self.assertEqual(n.n, 42)

self.assertEqual(type(n), N)

def test_module(self):

body = [ast.Num(42)]

x = ast.Module(body, [])

self.assertEqual(x.body, body)

def test_nodeclasses(self):

# Zero arguments constructor explicitly allowed

x = ast.BinOp()

self.assertEqual(x._fields, ('left', 'op', 'right'))

# Random attribute allowed too

x.foobarbaz = 5

self.assertEqual(x.foobarbaz, 5)

n1 = ast.Num(1)

n3 = ast.Num(3)

addop = ast.Add()

x = ast.BinOp(n1, addop, n3)

self.assertEqual(x.left, n1)

self.assertEqual(x.op, addop)

self.assertEqual(x.right, n3)

x = ast.BinOp(1, 2, 3)

self.assertEqual(x.left, 1)

self.assertEqual(x.op, 2)

self.assertEqual(x.right, 3)

x = ast.BinOp(1, 2, 3, lineno=0)

self.assertEqual(x.left, 1)

self.assertEqual(x.op, 2)

self.assertEqual(x.right, 3)

self.assertEqual(x.lineno, 0)

# node raises exception when given too many arguments

self.assertRaises(TypeError, ast.BinOp, 1, 2, 3, 4)

# node raises exception when given too many arguments

self.assertRaises(TypeError, ast.BinOp, 1, 2, 3, 4, lineno=0)

# can set attributes through kwargs too

x = ast.BinOp(left=1, op=2, right=3, lineno=0)

self.assertEqual(x.left, 1)

self.assertEqual(x.op, 2)

self.assertEqual(x.right, 3)

self.assertEqual(x.lineno, 0)

# Random kwargs also allowed

x = ast.BinOp(1, 2, 3, foobarbaz=42)

self.assertEqual(x.foobarbaz, 42)

def test_no_fields(self):

# this used to fail because Sub._fields was None

x = ast.Sub()

self.assertEqual(x._fields, ())

def test_pickling(self):

import pickle

mods = [pickle]

try:

import cPickle

mods.append(cPickle)

except ImportError:

pass

protocols = [0, 1, 2]

for mod in mods:

for protocol in protocols:

for ast in (compile(i, "?", "exec", 0x400) for i in exec_tests):

ast2 = mod.loads(mod.dumps(ast, protocol))

self.assertEqual(to_tuple(ast2), to_tuple(ast))

def test_invalid_sum(self):

pos = dict(lineno=2, col_offset=3)

m = ast.Module([ast.Expr(ast.expr(**pos), **pos)], [])

with self.assertRaises(TypeError) as cm:

compile(m, "<test>", "exec")

self.assertIn("but got <ast.expr", str(cm.exception))

def test_invalid_identifier(self):

m = ast.Module([ast.Expr(ast.Name(42, ast.Load()))], [])

ast.fix_missing_locations(m)

with self.assertRaises(TypeError) as cm:

compile(m, "<test>", "exec")

self.assertIn("identifier must be of type str", str(cm.exception))

def test_invalid_constant(self):

for invalid_constant in int, (1, 2, int), frozenset((1, 2, int)):

e = ast.Expression(body=ast.Constant(invalid_constant))

ast.fix_missing_locations(e)

with self.assertRaisesRegex(

TypeError, "invalid type in Constant: type"

compile(e, "<test>", "eval")

def test_empty_yield_from(self):

# Issue 16546: yield from value is not optional.

empty_yield_from = ast.parse("def f():\n yield from g()")

empty_yield_from.body[0].body[0].value.value = None

with self.assertRaises(ValueError) as cm:

compile(empty_yield_from, "<test>", "exec")

self.assertIn("field 'value' is required", str(cm.exception))

@support.cpython_only

def test_issue31592(self):

# There shouldn't be an assertion failure in case of a bad

# unicodedata.normalize().

import unicodedata

def bad_normalize(*args):

return None

with support.swap_attr(unicodedata, 'normalize', bad_normalize):

self.assertRaises(TypeError, ast.parse, '\u03D5')

def test_issue18374_binop_col_offset(self):

tree = ast.parse('4+5+6+7')

parent_binop = tree.body[0].value

child_binop = parent_binop.left

grandchild_binop = child_binop.left

self.assertEqual(parent_binop.col_offset, 0)

self.assertEqual(parent_binop.end_col_offset, 7)

self.assertEqual(child_binop.col_offset, 0)

self.assertEqual(child_binop.end_col_offset, 5)

self.assertEqual(grandchild_binop.col_offset, 0)

self.assertEqual(grandchild_binop.end_col_offset, 3)

tree = ast.parse('4+5-\\\n 6-7')

parent_binop = tree.body[0].value

child_binop = parent_binop.left

grandchild_binop = child_binop.left

self.assertEqual(parent_binop.col_offset, 0)

self.assertEqual(parent_binop.lineno, 1)

self.assertEqual(parent_binop.end_col_offset, 4)

self.assertEqual(parent_binop.end_lineno, 2)

self.assertEqual(child_binop.col_offset, 0)

self.assertEqual(child_binop.lineno, 1)

self.assertEqual(child_binop.end_col_offset, 2)

self.assertEqual(child_binop.end_lineno, 2)

self.assertEqual(grandchild_binop.col_offset, 0)

self.assertEqual(grandchild_binop.lineno, 1)

self.assertEqual(grandchild_binop.end_col_offset, 3)

self.assertEqual(grandchild_binop.end_lineno, 1)

def test_issue39579_dotted_name_end_col_offset(self):

tree = ast.parse('@a.b.c\ndef f(): pass')

attr_b = tree.body[0].decorator_list[0].value

self.assertEqual(attr_b.end_col_offset, 4)

def test_ast_asdl_signature(self):

self.assertEqual(ast.withitem.__doc__, "withitem(expr context_expr, expr? optional_vars)")

self.assertEqual(ast.GtE.__doc__, "GtE")

self.assertEqual(ast.Name.__doc__, "Name(identifier id, expr_context ctx)")

self.assertEqual(ast.cmpop.__doc__, "cmpop = Eq | NotEq | Lt | LtE | Gt | GtE | Is | IsNot | In | NotIn")

expressions = [f" | {node.__doc__}" for node in ast.expr.__subclasses__()]

expressions[0] = f"expr = {ast.expr.__subclasses__()[0].__doc__}"

self.assertCountEqual(ast.expr.__doc__.split("\n"), expressions)

def test_issue40614_feature_version(self):

ast.parse('f"{x=}"', feature_version=(3, 8))

with self.assertRaises(SyntaxError):

ast.parse('f"{x=}"', feature_version=(3, 7))

def test_constant_as_name(self):

for constant in "True", "False", "None":

expr = ast.Expression(ast.Name(constant, ast.Load()))

ast.fix_missing_locations(expr)

with self.assertRaisesRegex(ValueError, f"Name node can't be used with '{constant}' constant"):

compile(expr, "<test>", "eval")

class ASTHelpers_Test(unittest.TestCase):

maxDiff = None

def test_parse(self):

a = ast.parse('foo(1 + 1)')

b = compile('foo(1 + 1)', '<unknown>', 'exec', ast.PyCF_ONLY_AST)

self.assertEqual(ast.dump(a), ast.dump(b))

def test_parse_in_error(self):

try:

1/0

except Exception:

with self.assertRaises(SyntaxError) as e:

ast.literal_eval(r"'\U'")

self.assertIsNotNone(e.exception.__context__)

def test_dump(self):

node = ast.parse('spam(eggs, "and cheese")')

self.assertEqual(ast.dump(node),

"Module(body=[Expr(value=Call(func=Name(id='spam', ctx=Load()), "

"args=[Name(id='eggs', ctx=Load()), Constant(value='and cheese')], "

"keywords=[]))], type_ignores=[])"

)

self.assertEqual(ast.dump(node, annotate_fields=False),

"Module([Expr(Call(Name('spam', Load()), [Name('eggs', Load()), "

"Constant('and cheese')], []))], [])"

)

self.assertEqual(ast.dump(node, include_attributes=True),

"Module(body=[Expr(value=Call(func=Name(id='spam', ctx=Load(), "

"lineno=1, col_offset=0, end_lineno=1, end_col_offset=4), "

"args=[Name(id='eggs', ctx=Load(), lineno=1, col_offset=5, "

"end_lineno=1, end_col_offset=9), Constant(value='and cheese', "

"lineno=1, col_offset=11, end_lineno=1, end_col_offset=23)], keywords=[], "

"lineno=1, col_offset=0, end_lineno=1, end_col_offset=24), "

"lineno=1, col_offset=0, end_lineno=1, end_col_offset=24)], type_ignores=[])"

)

def test_dump_indent(self):

node = ast.parse('spam(eggs, "and cheese")')

self.assertEqual(ast.dump(node, indent=3), """\

Module(

body=[

Expr(

value=Call(

func=Name(id='spam', ctx=Load()),

args=[

Name(id='eggs', ctx=Load()),

Constant(value='and cheese')],

keywords=[]))],

type_ignores=[])""")

self.assertEqual(ast.dump(node, annotate_fields=False, indent='\t'), """\

Module(

\t[

\t\tExpr(

\t\t\tCall(

\t\t\t\tName('spam', Load()),

\t\t\t\t[

\t\t\t\t\tName('eggs', Load()),

\t\t\t\t\tConstant('and cheese')],

\t\t\t\t[]))],

\t[])""")

self.assertEqual(ast.dump(node, include_attributes=True, indent=3), """\

Module(

body=[

Expr(

value=Call(

func=Name(

id='spam',

ctx=Load(),

lineno=1,

col_offset=0,

end_lineno=1,

end_col_offset=4),

args=[

Name(

id='eggs',

ctx=Load(),

lineno=1,

col_offset=5,

end_lineno=1,

end_col_offset=9),

Constant(

value='and cheese',

lineno=1,

col_offset=11,

end_lineno=1,

end_col_offset=23)],

keywords=[],

lineno=1,

col_offset=0,

end_lineno=1,

end_col_offset=24),

lineno=1,

col_offset=0,

end_lineno=1,

end_col_offset=24)],

type_ignores=[])""")

def test_dump_incomplete(self):

node = ast.Raise(lineno=3, col_offset=4)

self.assertEqual(ast.dump(node),

"Raise()"

)

self.assertEqual(ast.dump(node, include_attributes=True),

"Raise(lineno=3, col_offset=4)"

)

node = ast.Raise(exc=ast.Name(id='e', ctx=ast.Load()), lineno=3, col_offset=4)

self.assertEqual(ast.dump(node),

"Raise(exc=Name(id='e', ctx=Load()))"

)

self.assertEqual(ast.dump(node, annotate_fields=False),

"Raise(Name('e', Load()))"

)

self.assertEqual(ast.dump(node, include_attributes=True),

"Raise(exc=Name(id='e', ctx=Load()), lineno=3, col_offset=4)"

)

self.assertEqual(ast.dump(node, annotate_fields=False, include_attributes=True),

"Raise(Name('e', Load()), lineno=3, col_offset=4)"

)

node = ast.Raise(cause=ast.Name(id='e', ctx=ast.Load()))

self.assertEqual(ast.dump(node),

"Raise(cause=Name(id='e', ctx=Load()))"

)

self.assertEqual(ast.dump(node, annotate_fields=False),

"Raise(cause=Name('e', Load()))"

)

def test_copy_location(self):

src = ast.parse('1 + 1', mode='eval')

src.body.right = ast.copy_location(ast.Num(2), src.body.right)

self.assertEqual(ast.dump(src, include_attributes=True),

'Expression(body=BinOp(left=Constant(value=1, lineno=1, col_offset=0, '

'end_lineno=1, end_col_offset=1), op=Add(), right=Constant(value=2, '

'lineno=1, col_offset=4, end_lineno=1, end_col_offset=5), lineno=1, '

'col_offset=0, end_lineno=1, end_col_offset=5))'

)

src = ast.Call(col_offset=1, lineno=1, end_lineno=1, end_col_offset=1)

new = ast.copy_location(src, ast.Call(col_offset=None, lineno=None))

self.assertIsNone(new.end_lineno)

self.assertIsNone(new.end_col_offset)

self.assertEqual(new.lineno, 1)

self.assertEqual(new.col_offset, 1)

def test_fix_missing_locations(self):

src = ast.parse('write("spam")')

src.body.append(ast.Expr(ast.Call(ast.Name('spam', ast.Load()),

[ast.Str('eggs')], [])))

self.assertEqual(src, ast.fix_missing_locations(src))

self.maxDiff = None

self.assertEqual(ast.dump(src, include_attributes=True),

"Module(body=[Expr(value=Call(func=Name(id='write', ctx=Load(), "

"lineno=1, col_offset=0, end_lineno=1, end_col_offset=5), "

"args=[Constant(value='spam', lineno=1, col_offset=6, end_lineno=1, "

"end_col_offset=12)], keywords=[], lineno=1, col_offset=0, end_lineno=1, "

"end_col_offset=13), lineno=1, col_offset=0, end_lineno=1, "

"end_col_offset=13), Expr(value=Call(func=Name(id='spam', ctx=Load(), "

"lineno=1, col_offset=0, end_lineno=1, end_col_offset=0), "

"args=[Constant(value='eggs', lineno=1, col_offset=0, end_lineno=1, "

"end_col_offset=0)], keywords=[], lineno=1, col_offset=0, end_lineno=1, "

"end_col_offset=0), lineno=1, col_offset=0, end_lineno=1, end_col_offset=0)], "

"type_ignores=[])"

)

def test_increment_lineno(self):

src = ast.parse('1 + 1', mode='eval')

self.assertEqual(ast.increment_lineno(src, n=3), src)

self.assertEqual(ast.dump(src, include_attributes=True),

'Expression(body=BinOp(left=Constant(value=1, lineno=4, col_offset=0, '

'end_lineno=4, end_col_offset=1), op=Add(), right=Constant(value=1, '

'lineno=4, col_offset=4, end_lineno=4, end_col_offset=5), lineno=4, '

'col_offset=0, end_lineno=4, end_col_offset=5))'

)

# issue10869: do not increment lineno of root twice

src = ast.parse('1 + 1', mode='eval')

self.assertEqual(ast.increment_lineno(src.body, n=3), src.body)

self.assertEqual(ast.dump(src, include_attributes=True),

'Expression(body=BinOp(left=Constant(value=1, lineno=4, col_offset=0, '

'end_lineno=4, end_col_offset=1), op=Add(), right=Constant(value=1, '

'lineno=4, col_offset=4, end_lineno=4, end_col_offset=5), lineno=4, '

'col_offset=0, end_lineno=4, end_col_offset=5))'

)

src = ast.Call(

func=ast.Name("test", ast.Load()), args=[], keywords=[], lineno=1

)

self.assertEqual(ast.increment_lineno(src).lineno, 2)

self.assertIsNone(ast.increment_lineno(src).end_lineno)

def test_iter_fields(self):

node = ast.parse('foo()', mode='eval')

d = dict(ast.iter_fields(node.body))

self.assertEqual(d.pop('func').id, 'foo')

self.assertEqual(d, {'keywords': [], 'args': []})

def test_iter_child_nodes(self):

node = ast.parse("spam(23, 42, eggs='leek')", mode='eval')

self.assertEqual(len(list(ast.iter_child_nodes(node.body))), 4)

iterator = ast.iter_child_nodes(node.body)

self.assertEqual(next(iterator).id, 'spam')

self.assertEqual(next(iterator).value, 23)

self.assertEqual(next(iterator).value, 42)

self.assertEqual(ast.dump(next(iterator)),

"keyword(arg='eggs', value=Constant(value='leek'))"

)

def test_get_docstring(self):

node = ast.parse('"""line one\n line two"""')

self.assertEqual(ast.get_docstring(node),

'line one\nline two')

node = ast.parse('class foo:\n """line one\n line two"""')

self.assertEqual(ast.get_docstring(node.body[0]),

'line one\nline two')

node = ast.parse('def foo():\n """line one\n line two"""')

self.assertEqual(ast.get_docstring(node.body[0]),

'line one\nline two')

node = ast.parse('async def foo():\n """spam\n ham"""')

self.assertEqual(ast.get_docstring(node.body[0]), 'spam\nham')

def test_get_docstring_none(self):

self.assertIsNone(ast.get_docstring(ast.parse('')))

node = ast.parse('x = "not docstring"')

self.assertIsNone(ast.get_docstring(node))

node = ast.parse('def foo():\n pass')

self.assertIsNone(ast.get_docstring(node))

node = ast.parse('class foo:\n pass')