import ast import builtins import copy import dis import enum import os import re import sys import textwrap import types import unittest import weakref from textwrap import dedent try: import _testinternalcapi except ImportError: _testinternalcapi = None from test import support from test.support import os_helper, script_helper from test.support.ast_helper import ASTTestMixin def to_tuple(t): if t is None or isinstance(t, (str, int, complex, float, bytes)) or t is Ellipsis: 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) STDLIB = os.path.dirname(ast.__file__) STDLIB_FILES = [fn for fn in os.listdir(STDLIB) if fn.endswith(".py")] STDLIB_FILES.extend(["test/test_grammar.py", "test/test_unpack_ex.py"]) # These tests are compiled through "exec" # There should be at least one test per statement exec_tests = [ # 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 varargs as TypeVarTuple "def f(*args: *Ts): pass", # FunctionDef with varargs as unpacked Tuple "def f(*args: *tuple[int, ...]): pass", # FunctionDef with varargs as unpacked Tuple *and* TypeVarTuple "def f(*args: *tuple[int, *Ts]): 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()'", # FunctionDef with type annotation on return involving unpacking "def f() -> tuple[*Ts]: pass", "def f() -> tuple[int, *Ts]: pass", "def f() -> tuple[int, *tuple[int, ...]]: pass", # ClassDef "class C:pass", # ClassDef with docstring "class C: 'docstring for class C'", # ClassDef, new style class "class C(object): pass", # Classdef with multiple bases "class C(A, B): pass", # Return "def f():return 1", "def f():return", # Delete "del v", # Assign "v = 1", "a,b = c", "(a,b) = c", "[a,b] = c", "a[b] = c", # AnnAssign with unpacked types "x: tuple[*Ts]", "x: tuple[int, *Ts]", "x: tuple[int, *tuple[str, ...]]", # AugAssign "v += 1", "v -= 1", "v *= 1", "v @= 1", "v /= 1", "v %= 1", "v **= 1", "v <<= 1", "v >>= 1", "v |= 1", "v ^= 1", "v &= 1", "v //= 1", # For "for v in v:pass", # For-Else "for v in v:\n pass\nelse:\n pass", # While "while v:pass", # While-Else "while v:\n pass\nelse:\n pass", # If-Elif-Else "if v:pass", "if a:\n pass\nelif b:\n pass", "if a:\n pass\nelse:\n pass", "if a:\n pass\nelif b:\n pass\nelse:\n pass", "if a:\n pass\nelif b:\n pass\nelif b:\n pass\nelif b:\n pass\nelse:\n pass", # With "with x: pass", "with x, y: pass", "with x as y: pass", "with x as y, z as q: pass", "with (x as y): pass", "with (x, y): pass", # Raise "raise", "raise Exception('string')", "raise Exception", "raise Exception('string') from None", # TryExcept "try:\n pass\nexcept Exception:\n pass", "try:\n pass\nexcept Exception as exc:\n pass", # TryFinally "try:\n pass\nfinally:\n pass", # TryStarExcept "try:\n pass\nexcept* Exception:\n pass", "try:\n pass\nexcept* Exception as exc:\n pass", # TryExceptFinallyElse "try:\n pass\nexcept Exception:\n pass\nelse: pass\nfinally:\n pass", "try:\n pass\nexcept Exception as exc:\n pass\nelse: pass\nfinally:\n pass", "try:\n pass\nexcept* Exception as exc:\n pass\nelse: pass\nfinally:\n pass", # Assert "assert v", # Assert with message "assert v, 'message'", # Import "import sys", "import foo as bar", # ImportFrom "from sys import x as y", "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) """( ( Aa , Bb ) for Aa , 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}", # Function with yield (from) "def f(): yield 1", "def f(): yield from []", # 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)", # Assignment expression in if statement "if a := foo(): pass", # Assignment expression in while "while a := foo(): pass", # 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", # Type aliases "type X = int", "type X[T] = int", "type X[T, *Ts, **P] = (T, Ts, P)", "type X[T: int, *Ts, **P] = (T, Ts, P)", "type X[T: (int, str), *Ts, **P] = (T, Ts, P)", "type X[T: int = 1, *Ts = 2, **P =3] = (T, Ts, P)", # Generic classes "class X[T]: pass", "class X[T, *Ts, **P]: pass", "class X[T: int, *Ts, **P]: pass", "class X[T: (int, str), *Ts, **P]: pass", "class X[T: int = 1, *Ts = 2, **P = 3]: pass", # Generic functions "def f[T](): pass", "def f[T, *Ts, **P](): pass", "def f[T: int, *Ts, **P](): pass", "def f[T: (int, str), *Ts, **P](): pass", "def f[T: int = 1, *Ts = 2, **P = 3](): pass", # Match "match x:\n\tcase 1:\n\t\tpass", # Match with _ "match x:\n\tcase 1:\n\t\tpass\n\tcase _:\n\t\tpass", ] # 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 = [ # Constant(value=None) "None", # True "True", # False "False", # BoolOp "a and b", "a or b", # BinOp "a + b", "a - b", "a * b", "a / b", "a @ b", "a // b", "a ** b", "a % b", "a >> b", "a << b", "a ^ b", "a | b", "a & b", # UnaryOp "not v", "+v", "-v", "~v", # Lambda "lambda:None", # Dict "{ 1:2 }", # Empty dict "{}", # Set "{None,}", # Multiline dict (test for .lineno & .col_offset) """{ 1 : 2 }""", # Multiline list """[ 1 , 1 ]""", # Multiline tuple """( 1 , )""", # Multiline set """{ 1 , 1 }""", # ListComp "[a for b in c if d]", # GeneratorExp "(a for b in c if d)", # SetComp "{a for b in c if d}", # DictComp "{k: v for k, v 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)", # Async comprehensions - async comprehensions can't work outside an asynchronous function # # Yield - yield expressions can't work outside a function # # Compare "1 < 2 < 3", "a == b", "a <= b", "a >= b", "a != b", "a is b", "a is not b", "a in b", "a not in b", # Call without argument "f()", # 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)", # Constant(value=int()) "10", # Complex num "1j", # Constant(value=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])", # Slice "[5][1:]", "[5][:1]", "[5][::1]", "[5][1:1:1]", # IfExp "foo() if x else bar()", # JoinedStr and FormattedValue "f'{a}'", "f'{a:.2f}'", "f'{a!r}'", "f'foo({a})'", ] class AST_Tests(unittest.TestCase): maxDiff = None 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) self.assertEqual(ast_node._fields, ast_node.__match_args__) 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, '', 'exec') def test_optimization_levels__debug__(self): cases = [(-1, '__debug__'), (0, '__debug__'), (1, False), (2, False)] for (optval, expected) in cases: with self.subTest(optval=optval, expected=expected): res1 = ast.parse("__debug__", optimize=optval) res2 = ast.parse(ast.parse("__debug__"), optimize=optval) for res in [res1, res2]: self.assertIsInstance(res.body[0], ast.Expr) if isinstance(expected, bool): self.assertIsInstance(res.body[0].value, ast.Constant) self.assertEqual(res.body[0].value.value, expected) else: self.assertIsInstance(res.body[0].value, ast.Name) self.assertEqual(res.body[0].value.id, expected) def test_optimization_levels_const_folding(self): folded = ('Expr', (1, 0, 1, 5), ('Constant', (1, 0, 1, 5), 3, None)) not_folded = ('Expr', (1, 0, 1, 5), ('BinOp', (1, 0, 1, 5), ('Constant', (1, 0, 1, 1), 1, None), ('Add',), ('Constant', (1, 4, 1, 5), 2, None))) cases = [(-1, not_folded), (0, not_folded), (1, folded), (2, folded)] for (optval, expected) in cases: with self.subTest(optval=optval): tree1 = ast.parse("1 + 2", optimize=optval) tree2 = ast.parse(ast.parse("1 + 2"), optimize=optval) for tree in [tree1, tree2]: res = to_tuple(tree.body[0]) self.assertEqual(res, expected) def test_invalid_position_information(self): invalid_linenos = [ (10, 1), (-10, -11), (10, -11), (-5, -2), (-5, 1) ] for lineno, end_lineno in invalid_linenos: with self.subTest(f"Check invalid linenos {lineno}:{end_lineno}"): snippet = "a = 1" tree = ast.parse(snippet) tree.body[0].lineno = lineno tree.body[0].end_lineno = end_lineno with self.assertRaises(ValueError): compile(tree, '', 'exec') invalid_col_offsets = [ (10, 1), (-10, -11), (10, -11), (-5, -2), (-5, 1) ] for col_offset, end_col_offset in invalid_col_offsets: with self.subTest(f"Check invalid col_offset {col_offset}:{end_col_offset}"): snippet = "a = 1" tree = ast.parse(snippet) tree.body[0].col_offset = col_offset tree.body[0].end_col_offset = end_col_offset with self.assertRaises(ValueError): compile(tree, '', 'exec') def test_compilation_of_ast_nodes_with_default_end_position_values(self): tree = ast.Module(body=[ ast.Import(names=[ast.alias(name='builtins', lineno=1, col_offset=0)], lineno=1, col_offset=0), ast.Import(names=[ast.alias(name='traceback', lineno=0, col_offset=0)], lineno=0, col_offset=1) ], type_ignores=[]) # Check that compilation doesn't crash. Note: this may crash explicitly only on debug mode. compile(tree, "", "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, "", "exec") def test_alias(self): im = ast.parse("from bar import y").body[0] self.assertEqual(len(im.names), 1) alias = im.names[0] self.assertEqual(alias.name, 'y') self.assertIsNone(alias.asname) self.assertEqual(alias.lineno, 1) self.assertEqual(alias.end_lineno, 1) self.assertEqual(alias.col_offset, 16) self.assertEqual(alias.end_col_offset, 17) im = ast.parse("from bar import *").body[0] alias = im.names[0] self.assertEqual(alias.name, '*') self.assertIsNone(alias.asname) self.assertEqual(alias.lineno, 1) self.assertEqual(alias.end_lineno, 1) self.assertEqual(alias.col_offset, 16) self.assertEqual(alias.end_col_offset, 17) im = ast.parse("from bar import y as z").body[0] alias = im.names[0] self.assertEqual(alias.name, "y") self.assertEqual(alias.asname, "z") self.assertEqual(alias.lineno, 1) self.assertEqual(alias.end_lineno, 1) self.assertEqual(alias.col_offset, 16) self.assertEqual(alias.end_col_offset, 22) im = ast.parse("import bar as foo").body[0] alias = im.names[0] self.assertEqual(alias.name, "bar") self.assertEqual(alias.asname, "foo") self.assertEqual(alias.lineno, 1) self.assertEqual(alias.end_lineno, 1) self.assertEqual(alias.col_offset, 7) self.assertEqual(alias.end_col_offset, 17) 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(): # constructor has a different signature if name == 'Index': continue if self._is_ast_node(name, item): x = self._construct_ast_class(item) if isinstance(x, ast.AST): self.assertIs(type(x._fields), tuple) def _construct_ast_class(self, cls): kwargs = {} for name, typ in cls.__annotations__.items(): if typ is str: kwargs[name] = 'capybara' elif typ is int: kwargs[name] = 42 elif typ is object: kwargs[name] = b'capybara' elif isinstance(typ, type) and issubclass(typ, ast.AST): kwargs[name] = self._construct_ast_class(typ) return cls(**kwargs) def test_arguments(self): x = ast.arguments() self.assertEqual(x._fields, ('posonlyargs', 'args', 'vararg', 'kwonlyargs', 'kw_defaults', 'kwarg', 'defaults')) self.assertEqual(x.__annotations__, { 'posonlyargs': list[ast.arg], 'args': list[ast.arg], 'vararg': ast.arg | None, 'kwonlyargs': list[ast.arg], 'kw_defaults': list[ast.expr], 'kwarg': ast.arg | None, 'defaults': list[ast.expr], }) self.assertEqual(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.Constant(1) # We can assign to _fields x._fields = 666 self.assertEqual(x._fields, 666) def test_classattrs(self): with self.assertWarns(DeprecationWarning): x = ast.Constant() self.assertEqual(x._fields, ('value', 'kind')) with self.assertRaises(AttributeError): x.value x = ast.Constant(42) self.assertEqual(x.value, 42) with self.assertRaises(AttributeError): x.lineno with self.assertRaises(AttributeError): x.foobar x = ast.Constant(lineno=2, value=3) self.assertEqual(x.lineno, 2) x = ast.Constant(42, lineno=0) self.assertEqual(x.lineno, 0) self.assertEqual(x._fields, ('value', 'kind')) self.assertEqual(x.value, 42) self.assertRaises(TypeError, ast.Constant, 1, None, 2) self.assertRaises(TypeError, ast.Constant, 1, None, 2, lineno=0) # Arbitrary keyword arguments are supported (but deprecated) with self.assertWarns(DeprecationWarning): self.assertEqual(ast.Constant(1, foo='bar').foo, 'bar') with self.assertRaisesRegex(TypeError, "Constant got multiple values for argument 'value'"): ast.Constant(1, value=2) 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_constant_subclasses(self): class N(ast.Constant): def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) self.z = 'spam' class N2(ast.Constant): pass n = N(42) self.assertEqual(n.value, 42) self.assertEqual(n.z, 'spam') self.assertEqual(type(n), N) self.assertTrue(isinstance(n, N)) self.assertTrue(isinstance(n, ast.Constant)) self.assertFalse(isinstance(n, N2)) self.assertFalse(isinstance(ast.Constant(42), N)) n = N(value=42) self.assertEqual(n.value, 42) self.assertEqual(type(n), N) def test_module(self): body = [ast.Constant(42)] x = ast.Module(body, []) self.assertEqual(x.body, body) def test_nodeclasses(self): # Zero arguments constructor explicitly allowed (but deprecated) with self.assertWarns(DeprecationWarning): x = ast.BinOp() self.assertEqual(x._fields, ('left', 'op', 'right')) # Random attribute allowed too x.foobarbaz = 5 self.assertEqual(x.foobarbaz, 5) n1 = ast.Constant(1) n3 = ast.Constant(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 (but deprecated) with self.assertWarns(DeprecationWarning): 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_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, "", "exec") self.assertIn("but got ", "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, "", "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, "", "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_compare_basics(self): self.assertTrue(ast.compare(ast.parse("x = 10"), ast.parse("x = 10"))) self.assertFalse(ast.compare(ast.parse("x = 10"), ast.parse(""))) self.assertFalse(ast.compare(ast.parse("x = 10"), ast.parse("x"))) self.assertFalse( ast.compare(ast.parse("x = 10;y = 20"), ast.parse("class C:pass")) ) def test_compare_modified_ast(self): # The ast API is a bit underspecified. The objects are mutable, # and even _fields and _attributes are mutable. The compare() does # some simple things to accommodate mutability. a = ast.parse("m * x + b", mode="eval") b = ast.parse("m * x + b", mode="eval") self.assertTrue(ast.compare(a, b)) a._fields = a._fields + ("spam",) a.spam = "Spam" self.assertNotEqual(a._fields, b._fields) self.assertFalse(ast.compare(a, b)) self.assertFalse(ast.compare(b, a)) b._fields = a._fields b.spam = a.spam self.assertTrue(ast.compare(a, b)) self.assertTrue(ast.compare(b, a)) b._attributes = b._attributes + ("eggs",) b.eggs = "eggs" self.assertNotEqual(a._attributes, b._attributes) self.assertFalse(ast.compare(a, b, compare_attributes=True)) self.assertFalse(ast.compare(b, a, compare_attributes=True)) a._attributes = b._attributes a.eggs = b.eggs self.assertTrue(ast.compare(a, b, compare_attributes=True)) self.assertTrue(ast.compare(b, a, compare_attributes=True)) def test_compare_literals(self): constants = ( -20, 20, 20.0, 1, 1.0, True, 0, False, frozenset(), tuple(), "ABCD", "abcd", "中文字", 1e1000, -1e1000, ) for next_index, constant in enumerate(constants[:-1], 1): next_constant = constants[next_index] with self.subTest(literal=constant, next_literal=next_constant): self.assertTrue( ast.compare(ast.Constant(constant), ast.Constant(constant)) ) self.assertFalse( ast.compare( ast.Constant(constant), ast.Constant(next_constant) ) ) same_looking_literal_cases = [ {1, 1.0, True, 1 + 0j}, {0, 0.0, False, 0 + 0j}, ] for same_looking_literals in same_looking_literal_cases: for literal in same_looking_literals: for same_looking_literal in same_looking_literals - {literal}: self.assertFalse( ast.compare( ast.Constant(literal), ast.Constant(same_looking_literal), ) ) def test_compare_fieldless(self): self.assertTrue(ast.compare(ast.Add(), ast.Add())) self.assertFalse(ast.compare(ast.Sub(), ast.Add())) # test that missing runtime fields is handled in ast.compare() a1, a2 = ast.Name('a'), ast.Name('a') self.assertTrue(ast.compare(a1, a2)) self.assertTrue(ast.compare(a1, a2)) del a1.id self.assertFalse(ast.compare(a1, a2)) del a2.id self.assertTrue(ast.compare(a1, a2)) def test_compare_modes(self): for mode, sources in ( ("exec", exec_tests), ("eval", eval_tests), ("single", single_tests), ): for source in sources: a = ast.parse(source, mode=mode) b = ast.parse(source, mode=mode) self.assertTrue( ast.compare(a, b), f"{ast.dump(a)} != {ast.dump(b)}" ) def test_compare_attributes_option(self): def parse(a, b): return ast.parse(a), ast.parse(b) a, b = parse("2 + 2", "2+2") self.assertTrue(ast.compare(a, b)) self.assertTrue(ast.compare(a, b, compare_attributes=False)) self.assertFalse(ast.compare(a, b, compare_attributes=True)) def test_compare_attributes_option_missing_attribute(self): # test that missing runtime attributes is handled in ast.compare() a1, a2 = ast.Name('a', lineno=1), ast.Name('a', lineno=1) self.assertTrue(ast.compare(a1, a2)) self.assertTrue(ast.compare(a1, a2, compare_attributes=True)) del a1.lineno self.assertFalse(ast.compare(a1, a2, compare_attributes=True)) del a2.lineno self.assertTrue(ast.compare(a1, a2, compare_attributes=True)) def test_positional_only_feature_version(self): ast.parse('def foo(x, /): ...', feature_version=(3, 8)) ast.parse('def bar(x=1, /): ...', feature_version=(3, 8)) with self.assertRaises(SyntaxError): ast.parse('def foo(x, /): ...', feature_version=(3, 7)) with self.assertRaises(SyntaxError): ast.parse('def bar(x=1, /): ...', feature_version=(3, 7)) ast.parse('lambda x, /: ...', feature_version=(3, 8)) ast.parse('lambda x=1, /: ...', feature_version=(3, 8)) with self.assertRaises(SyntaxError): ast.parse('lambda x, /: ...', feature_version=(3, 7)) with self.assertRaises(SyntaxError): ast.parse('lambda x=1, /: ...', feature_version=(3, 7)) def test_assignment_expression_feature_version(self): ast.parse('(x := 0)', feature_version=(3, 8)) with self.assertRaises(SyntaxError): ast.parse('(x := 0)', feature_version=(3, 7)) def test_conditional_context_managers_parse_with_low_feature_version(self): # regression test for gh-115881 ast.parse('with (x() if y else z()): ...', feature_version=(3, 8)) def test_exception_groups_feature_version(self): code = dedent(''' try: ... except* Exception: ... ''') ast.parse(code) with self.assertRaises(SyntaxError): ast.parse(code, feature_version=(3, 10)) def test_type_params_feature_version(self): samples = [ "type X = int", "class X[T]: pass", "def f[T](): pass", ] for sample in samples: with self.subTest(sample): ast.parse(sample) with self.assertRaises(SyntaxError): ast.parse(sample, feature_version=(3, 11)) def test_type_params_default_feature_version(self): samples = [ "type X[*Ts=int] = int", "class X[T=int]: pass", "def f[**P=int](): pass", ] for sample in samples: with self.subTest(sample): ast.parse(sample) with self.assertRaises(SyntaxError): ast.parse(sample, feature_version=(3, 12)) def test_invalid_major_feature_version(self): with self.assertRaises(ValueError): ast.parse('pass', feature_version=(2, 7)) with self.assertRaises(ValueError): ast.parse('pass', feature_version=(4, 0)) 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"identifier field can't represent '{constant}' constant"): compile(expr, "", "eval") def test_precedence_enum(self): class _Precedence(enum.IntEnum): """Precedence table that originated from python grammar.""" NAMED_EXPR = enum.auto() # := TUPLE = enum.auto() # , YIELD = enum.auto() # 'yield', 'yield from' TEST = enum.auto() # 'if'-'else', 'lambda' OR = enum.auto() # 'or' AND = enum.auto() # 'and' NOT = enum.auto() # 'not' CMP = enum.auto() # '<', '>', '==', '>=', '<=', '!=', # 'in', 'not in', 'is', 'is not' EXPR = enum.auto() BOR = EXPR # '|' BXOR = enum.auto() # '^' BAND = enum.auto() # '&' SHIFT = enum.auto() # '<<', '>>' ARITH = enum.auto() # '+', '-' TERM = enum.auto() # '*', '@', '/', '%', '//' FACTOR = enum.auto() # unary '+', '-', '~' POWER = enum.auto() # '**' AWAIT = enum.auto() # 'await' ATOM = enum.auto() def next(self): try: return self.__class__(self + 1) except ValueError: return self enum._test_simple_enum(_Precedence, ast._Precedence) @support.cpython_only def test_ast_recursion_limit(self): fail_depth = support.exceeds_recursion_limit() crash_depth = 100_000 success_depth = int(support.get_c_recursion_limit() * 0.8) if _testinternalcapi is not None: remaining = _testinternalcapi.get_c_recursion_remaining() success_depth = min(success_depth, remaining) def check_limit(prefix, repeated): expect_ok = prefix + repeated * success_depth ast.parse(expect_ok) for depth in (fail_depth, crash_depth): broken = prefix + repeated * depth details = "Compiling ({!r} + {!r} * {})".format( prefix, repeated, depth) with self.assertRaises(RecursionError, msg=details): with support.infinite_recursion(): ast.parse(broken) check_limit("a", "()") check_limit("a", ".b") check_limit("a", "[0]") check_limit("a", "*a") def test_null_bytes(self): with self.assertRaises(SyntaxError, msg="source code string cannot contain null bytes"): ast.parse("a\0b") def assert_none_check(self, node: type[ast.AST], attr: str, source: str) -> None: with self.subTest(f"{node.__name__}.{attr}"): tree = ast.parse(source) found = 0 for child in ast.walk(tree): if isinstance(child, node): setattr(child, attr, None) found += 1 self.assertEqual(found, 1) e = re.escape(f"field '{attr}' is required for {node.__name__}") with self.assertRaisesRegex(ValueError, f"^{e}$"): compile(tree, "", "exec") def test_none_checks(self) -> None: tests = [ (ast.alias, "name", "import spam as SPAM"), (ast.arg, "arg", "def spam(SPAM): spam"), (ast.comprehension, "target", "[spam for SPAM in spam]"), (ast.comprehension, "iter", "[spam for spam in SPAM]"), (ast.keyword, "value", "spam(**SPAM)"), (ast.match_case, "pattern", "match spam:\n case SPAM: spam"), (ast.withitem, "context_expr", "with SPAM: spam"), ] for node, attr, source in tests: self.assert_none_check(node, attr, source) class CopyTests(unittest.TestCase): """Test copying and pickling AST nodes.""" @staticmethod def iter_ast_classes(): """Iterate over the (native) subclasses of ast.AST recursively. This excludes the special class ast.Index since its constructor returns an integer. """ def do(cls): if cls.__module__ != 'ast': return if cls is ast.Index: return yield cls for sub in cls.__subclasses__(): yield from do(sub) yield from do(ast.AST) def test_pickling(self): import pickle for protocol in range(pickle.HIGHEST_PROTOCOL + 1): for code in exec_tests: with self.subTest(code=code, protocol=protocol): tree = compile(code, "?", "exec", 0x400) ast2 = pickle.loads(pickle.dumps(tree, protocol)) self.assertEqual(to_tuple(ast2), to_tuple(tree)) def test_copy_with_parents(self): # gh-120108 code = """ ('',) while i < n: if ch == '': ch = format[i] if ch == '': if freplace is None: '' % getattr(object) elif ch == '': if zreplace is None: if hasattr: offset = object.utcoffset() if offset is not None: if offset.days < 0: offset = -offset h = divmod(timedelta(hours=0)) if u: zreplace = '' % (sign,) elif s: zreplace = '' % (sign,) else: zreplace = '' % (sign,) elif ch == '': if Zreplace is None: Zreplace = '' if hasattr(object): s = object.tzname() if s is not None: Zreplace = s.replace('') newformat.append(Zreplace) else: push('') else: push(ch) """ tree = ast.parse(textwrap.dedent(code)) for node in ast.walk(tree): for child in ast.iter_child_nodes(node): child.parent = node try: with support.infinite_recursion(200): tree2 = copy.deepcopy(tree) finally: # Singletons like ast.Load() are shared; make sure we don't # leave them mutated after this test. for node in ast.walk(tree): if hasattr(node, "parent"): del node.parent for node in ast.walk(tree2): for child in ast.iter_child_nodes(node): if hasattr(child, "parent") and not isinstance(child, ( ast.expr_context, ast.boolop, ast.unaryop, ast.cmpop, ast.operator, )): self.assertEqual(to_tuple(child.parent), to_tuple(node)) def test_replace_interface(self): for klass in self.iter_ast_classes(): with self.subTest(klass=klass): self.assertTrue(hasattr(klass, '__replace__')) fields = set(klass._fields) with self.subTest(klass=klass, fields=fields): node = klass(**dict.fromkeys(fields)) # forbid positional arguments in replace() self.assertRaises(TypeError, copy.replace, node, 1) self.assertRaises(TypeError, node.__replace__, 1) def test_replace_native(self): for klass in self.iter_ast_classes(): fields = set(klass._fields) attributes = set(klass._attributes) with self.subTest(klass=klass, fields=fields, attributes=attributes): # use of object() to ensure that '==' and 'is' # behave similarly in ast.compare(node, repl) old_fields = {field: object() for field in fields} old_attrs = {attr: object() for attr in attributes} # check shallow copy node = klass(**old_fields) repl = copy.replace(node) self.assertTrue(ast.compare(node, repl, compare_attributes=True)) # check when passing using attributes (they may be optional!) node = klass(**old_fields, **old_attrs) repl = copy.replace(node) self.assertTrue(ast.compare(node, repl, compare_attributes=True)) for field in fields: # check when we sometimes have attributes and sometimes not for init_attrs in [{}, old_attrs]: node = klass(**old_fields, **init_attrs) # only change a single field (do not change attributes) new_value = object() repl = copy.replace(node, **{field: new_value}) for f in fields: old_value = old_fields[f] # assert that there is no side-effect self.assertIs(getattr(node, f), old_value) # check the changes if f != field: self.assertIs(getattr(repl, f), old_value) else: self.assertIs(getattr(repl, f), new_value) self.assertFalse(ast.compare(node, repl, compare_attributes=True)) for attribute in attributes: node = klass(**old_fields, **old_attrs) # only change a single attribute (do not change fields) new_attr = object() repl = copy.replace(node, **{attribute: new_attr}) for a in attributes: old_attr = old_attrs[a] # assert that there is no side-effect self.assertIs(getattr(node, a), old_attr) # check the changes if a != attribute: self.assertIs(getattr(repl, a), old_attr) else: self.assertIs(getattr(repl, a), new_attr) self.assertFalse(ast.compare(node, repl, compare_attributes=True)) def test_replace_accept_known_class_fields(self): nid, ctx = object(), object() node = ast.Name(id=nid, ctx=ctx) self.assertIs(node.id, nid) self.assertIs(node.ctx, ctx) new_nid = object() repl = copy.replace(node, id=new_nid) # assert that there is no side-effect self.assertIs(node.id, nid) self.assertIs(node.ctx, ctx) # check the changes self.assertIs(repl.id, new_nid) self.assertIs(repl.ctx, node.ctx) # no changes def test_replace_accept_known_class_attributes(self): node = ast.parse('x').body[0].value self.assertEqual(node.id, 'x') self.assertEqual(node.lineno, 1) # constructor allows any type so replace() should do the same lineno = object() repl = copy.replace(node, lineno=lineno) # assert that there is no side-effect self.assertEqual(node.lineno, 1) # check the changes self.assertEqual(repl.id, node.id) self.assertEqual(repl.ctx, node.ctx) self.assertEqual(repl.lineno, lineno) _, _, state = node.__reduce__() self.assertEqual(state['id'], 'x') self.assertEqual(state['ctx'], node.ctx) self.assertEqual(state['lineno'], 1) _, _, state = repl.__reduce__() self.assertEqual(state['id'], 'x') self.assertEqual(state['ctx'], node.ctx) self.assertEqual(state['lineno'], lineno) def test_replace_accept_known_custom_class_fields(self): class MyNode(ast.AST): _fields = ('name', 'data') __annotations__ = {'name': str, 'data': object} __match_args__ = ('name', 'data') name, data = 'name', object() node = MyNode(name, data) self.assertIs(node.name, name) self.assertIs(node.data, data) # check shallow copy repl = copy.replace(node) # assert that there is no side-effect self.assertIs(node.name, name) self.assertIs(node.data, data) # check the shallow copy self.assertIs(repl.name, name) self.assertIs(repl.data, data) node = MyNode(name, data) repl_data = object() # replace custom but known field repl = copy.replace(node, data=repl_data) # assert that there is no side-effect self.assertIs(node.name, name) self.assertIs(node.data, data) # check the changes self.assertIs(repl.name, node.name) self.assertIs(repl.data, repl_data) def test_replace_accept_known_custom_class_attributes(self): class MyNode(ast.AST): x = 0 y = 1 _attributes = ('x', 'y') node = MyNode() self.assertEqual(node.x, 0) self.assertEqual(node.y, 1) y = object() repl = copy.replace(node, y=y) # assert that there is no side-effect self.assertEqual(node.x, 0) self.assertEqual(node.y, 1) # check the changes self.assertEqual(repl.x, 0) self.assertEqual(repl.y, y) def test_replace_ignore_known_custom_instance_fields(self): node = ast.parse('x').body[0].value node.extra = extra = object() # add instance 'extra' field context = node.ctx # assert initial values self.assertIs(node.id, 'x') self.assertIs(node.ctx, context) self.assertIs(node.extra, extra) # shallow copy, but drops extra fields repl = copy.replace(node) # assert that there is no side-effect self.assertIs(node.id, 'x') self.assertIs(node.ctx, context) self.assertIs(node.extra, extra) # verify that the 'extra' field is not kept self.assertIs(repl.id, 'x') self.assertIs(repl.ctx, context) self.assertRaises(AttributeError, getattr, repl, 'extra') # change known native field repl = copy.replace(node, id='y') # assert that there is no side-effect self.assertIs(node.id, 'x') self.assertIs(node.ctx, context) self.assertIs(node.extra, extra) # verify that the 'extra' field is not kept self.assertIs(repl.id, 'y') self.assertIs(repl.ctx, context) self.assertRaises(AttributeError, getattr, repl, 'extra') def test_replace_reject_missing_field(self): # case: warn if deleted field is not replaced node = ast.parse('x').body[0].value context = node.ctx del node.id self.assertRaises(AttributeError, getattr, node, 'id') self.assertIs(node.ctx, context) msg = "Name.__replace__ missing 1 keyword argument: 'id'." with self.assertRaisesRegex(TypeError, re.escape(msg)): copy.replace(node) # assert that there is no side-effect self.assertRaises(AttributeError, getattr, node, 'id') self.assertIs(node.ctx, context) # case: do not raise if deleted field is replaced node = ast.parse('x').body[0].value context = node.ctx del node.id self.assertRaises(AttributeError, getattr, node, 'id') self.assertIs(node.ctx, context) repl = copy.replace(node, id='y') # assert that there is no side-effect self.assertRaises(AttributeError, getattr, node, 'id') self.assertIs(node.ctx, context) self.assertIs(repl.id, 'y') self.assertIs(repl.ctx, context) def test_replace_reject_known_custom_instance_fields_commits(self): node = ast.parse('x').body[0].value node.extra = extra = object() # add instance 'extra' field context = node.ctx # explicit rejection of known instance fields self.assertTrue(hasattr(node, 'extra')) msg = "Name.__replace__ got an unexpected keyword argument 'extra'." with self.assertRaisesRegex(TypeError, re.escape(msg)): copy.replace(node, extra=1) # assert that there is no side-effect self.assertIs(node.id, 'x') self.assertIs(node.ctx, context) self.assertIs(node.extra, extra) def test_replace_reject_unknown_instance_fields(self): node = ast.parse('x').body[0].value context = node.ctx # explicit rejection of unknown extra fields self.assertRaises(AttributeError, getattr, node, 'unknown') msg = "Name.__replace__ got an unexpected keyword argument 'unknown'." with self.assertRaisesRegex(TypeError, re.escape(msg)): copy.replace(node, unknown=1) # assert that there is no side-effect self.assertIs(node.id, 'x') self.assertIs(node.ctx, context) self.assertRaises(AttributeError, getattr, node, 'unknown') class ASTHelpers_Test(unittest.TestCase): maxDiff = None def test_parse(self): a = ast.parse('foo(1 + 1)') b = compile('foo(1 + 1)', '', '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')]))])" ) 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)], " "lineno=1, col_offset=0, end_lineno=1, end_col_offset=24), " "lineno=1, col_offset=0, end_lineno=1, end_col_offset=24)])" ) 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')]))])""") 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')]))])""") 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)], lineno=1, col_offset=0, end_lineno=1, end_col_offset=24), lineno=1, col_offset=0, end_lineno=1, end_col_offset=24)])""") 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()))" ) # Arguments: node = ast.arguments(args=[ast.arg("x")]) self.assertEqual(ast.dump(node, annotate_fields=False), "arguments([], [arg('x')])", ) node = ast.arguments(posonlyargs=[ast.arg("x")]) self.assertEqual(ast.dump(node, annotate_fields=False), "arguments([arg('x')])", ) node = ast.arguments(posonlyargs=[ast.arg("x")], kwonlyargs=[ast.arg('y')]) self.assertEqual(ast.dump(node, annotate_fields=False), "arguments([arg('x')], kwonlyargs=[arg('y')])", ) node = ast.arguments(args=[ast.arg("x")], kwonlyargs=[ast.arg('y')]) self.assertEqual(ast.dump(node, annotate_fields=False), "arguments([], [arg('x')], kwonlyargs=[arg('y')])", ) node = ast.arguments() self.assertEqual(ast.dump(node, annotate_fields=False), "arguments()", ) # Classes: node = ast.ClassDef( 'T', [], [ast.keyword('a', ast.Constant(None))], [], [ast.Name('dataclass', ctx=ast.Load())], ) self.assertEqual(ast.dump(node), "ClassDef(name='T', keywords=[keyword(arg='a', value=Constant(value=None))], decorator_list=[Name(id='dataclass', ctx=Load())])", ) self.assertEqual(ast.dump(node, annotate_fields=False), "ClassDef('T', [], [keyword('a', Constant(None))], [], [Name('dataclass', Load())])", ) def test_dump_show_empty(self): def check_node(node, empty, full, **kwargs): with self.subTest(show_empty=False): self.assertEqual( ast.dump(node, show_empty=False, **kwargs), empty, ) with self.subTest(show_empty=True): self.assertEqual( ast.dump(node, show_empty=True, **kwargs), full, ) def check_text(code, empty, full, **kwargs): check_node(ast.parse(code), empty, full, **kwargs) check_node( ast.arguments(), empty="arguments()", full="arguments(posonlyargs=[], args=[], kwonlyargs=[], kw_defaults=[], defaults=[])", ) check_node( # Corner case: there are no real `Name` instances with `id=''`: ast.Name(id='', ctx=ast.Load()), empty="Name(id='', ctx=Load())", full="Name(id='', ctx=Load())", ) check_node( ast.MatchSingleton(value=None), empty="MatchSingleton(value=None)", full="MatchSingleton(value=None)", ) check_node( ast.Constant(value=None), empty="Constant(value=None)", full="Constant(value=None)", ) check_node( ast.Constant(value=''), empty="Constant(value='')", full="Constant(value='')", ) check_text( "def a(b: int = 0, *, c): ...", empty="Module(body=[FunctionDef(name='a', args=arguments(args=[arg(arg='b', annotation=Name(id='int', ctx=Load()))], kwonlyargs=[arg(arg='c')], kw_defaults=[None], defaults=[Constant(value=0)]), body=[Expr(value=Constant(value=Ellipsis))])])", full="Module(body=[FunctionDef(name='a', args=arguments(posonlyargs=[], args=[arg(arg='b', annotation=Name(id='int', ctx=Load()))], kwonlyargs=[arg(arg='c')], kw_defaults=[None], defaults=[Constant(value=0)]), body=[Expr(value=Constant(value=Ellipsis))], decorator_list=[], type_params=[])], type_ignores=[])", ) check_text( "def a(b: int = 0, *, c): ...", empty="Module(body=[FunctionDef(name='a', args=arguments(args=[arg(arg='b', annotation=Name(id='int', ctx=Load(), lineno=1, col_offset=9, end_lineno=1, end_col_offset=12), lineno=1, col_offset=6, end_lineno=1, end_col_offset=12)], kwonlyargs=[arg(arg='c', lineno=1, col_offset=21, end_lineno=1, end_col_offset=22)], kw_defaults=[None], defaults=[Constant(value=0, lineno=1, col_offset=15, end_lineno=1, end_col_offset=16)]), body=[Expr(value=Constant(value=Ellipsis, lineno=1, col_offset=25, end_lineno=1, end_col_offset=28), lineno=1, col_offset=25, end_lineno=1, end_col_offset=28)], lineno=1, col_offset=0, end_lineno=1, end_col_offset=28)])", full="Module(body=[FunctionDef(name='a', args=arguments(posonlyargs=[], args=[arg(arg='b', annotation=Name(id='int', ctx=Load(), lineno=1, col_offset=9, end_lineno=1, end_col_offset=12), lineno=1, col_offset=6, end_lineno=1, end_col_offset=12)], kwonlyargs=[arg(arg='c', lineno=1, col_offset=21, end_lineno=1, end_col_offset=22)], kw_defaults=[None], defaults=[Constant(value=0, lineno=1, col_offset=15, end_lineno=1, end_col_offset=16)]), body=[Expr(value=Constant(value=Ellipsis, lineno=1, col_offset=25, end_lineno=1, end_col_offset=28), lineno=1, col_offset=25, end_lineno=1, end_col_offset=28)], decorator_list=[], type_params=[], lineno=1, col_offset=0, end_lineno=1, end_col_offset=28)], type_ignores=[])", include_attributes=True, ) check_text( 'spam(eggs, "and cheese")', empty="Module(body=[Expr(value=Call(func=Name(id='spam', ctx=Load()), args=[Name(id='eggs', ctx=Load()), Constant(value='and cheese')]))])", full="Module(body=[Expr(value=Call(func=Name(id='spam', ctx=Load()), args=[Name(id='eggs', ctx=Load()), Constant(value='and cheese')], keywords=[]))], type_ignores=[])", ) check_text( 'spam(eggs, text="and cheese")', empty="Module(body=[Expr(value=Call(func=Name(id='spam', ctx=Load()), args=[Name(id='eggs', ctx=Load())], keywords=[keyword(arg='text', value=Constant(value='and cheese'))]))])", full="Module(body=[Expr(value=Call(func=Name(id='spam', ctx=Load()), args=[Name(id='eggs', ctx=Load())], keywords=[keyword(arg='text', value=Constant(value='and cheese'))]))], type_ignores=[])", ) check_text( "import _ast as ast; from module import sub", empty="Module(body=[Import(names=[alias(name='_ast', asname='ast')]), ImportFrom(module='module', names=[alias(name='sub')], level=0)])", full="Module(body=[Import(names=[alias(name='_ast', asname='ast')]), ImportFrom(module='module', names=[alias(name='sub')], level=0)], type_ignores=[])", ) def test_copy_location(self): src = ast.parse('1 + 1', mode='eval') src.body.right = ast.copy_location(ast.Constant(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))' ) func = ast.Name('spam', ast.Load()) src = ast.Call(col_offset=1, lineno=1, end_lineno=1, end_col_offset=1, func=func) new = ast.copy_location(src, ast.Call(col_offset=None, lineno=None, func=func)) 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.Constant('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)], 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)], lineno=1, col_offset=0, end_lineno=1, " "end_col_offset=0), lineno=1, col_offset=0, end_lineno=1, end_col_offset=0)])" ) 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_increment_lineno_on_module(self): src = ast.parse(dedent("""\ a = 1 b = 2 # type: ignore c = 3 d = 4 # type: ignore@tag """), type_comments=True) ast.increment_lineno(src, n=5) self.assertEqual(src.type_ignores[0].lineno, 7) self.assertEqual(src.type_ignores[1].lineno, 9) self.assertEqual(src.type_ignores[1].tag, '@tag') 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') node = ast.parse('async def foo():\n """spam\n ham"""') self.assertEqual(ast.get_docstring(node.body[0], clean=False), 'spam\n ham') node = ast.parse('x') self.assertRaises(TypeError, ast.get_docstring, node.body[0]) 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') self.assertIsNone(ast.get_docstring(node.body[0])) node = ast.parse('class foo:\n x = "not docstring"') self.assertIsNone(ast.get_docstring(node.body[0])) node = ast.parse('class foo:\n def bar(self): pass') self.assertIsNone(ast.get_docstring(node.body[0])) node = ast.parse('def foo():\n pass') self.assertIsNone(ast.get_docstring(node.body[0])) node = ast.parse('def foo():\n x = "not docstring"') self.assertIsNone(ast.get_docstring(node.body[0])) node = ast.parse('async def foo():\n pass') self.assertIsNone(ast.get_docstring(node.body[0])) node = ast.parse('async def foo():\n x = "not docstring"') self.assertIsNone(ast.get_docstring(node.body[0])) node = ast.parse('async def foo():\n 42') self.assertIsNone(ast.get_docstring(node.body[0])) def test_multi_line_docstring_col_offset_and_lineno_issue16806(self): node = ast.parse( '"""line one\nline two"""\n\n' 'def foo():\n """line one\n line two"""\n\n' ' def bar():\n """line one\n line two"""\n' ' """line one\n line two"""\n' '"""line one\nline two"""\n\n' ) self.assertEqual(node.body[0].col_offset, 0) self.assertEqual(node.body[0].lineno, 1) self.assertEqual(node.body[1].body[0].col_offset, 2) self.assertEqual(node.body[1].body[0].lineno, 5) self.assertEqual(node.body[1].body[1].body[0].col_offset, 4) self.assertEqual(node.body[1].body[1].body[0].lineno, 9) self.assertEqual(node.body[1].body[2].col_offset, 2) self.assertEqual(node.body[1].body[2].lineno, 11) self.assertEqual(node.body[2].col_offset, 0) self.assertEqual(node.body[2].lineno, 13) def test_elif_stmt_start_position(self): node = ast.parse('if a:\n pass\nelif b:\n pass\n') elif_stmt = node.body[0].orelse[0] self.assertEqual(elif_stmt.lineno, 3) self.assertEqual(elif_stmt.col_offset, 0) def test_elif_stmt_start_position_with_else(self): node = ast.parse('if a:\n pass\nelif b:\n pass\nelse:\n pass\n') elif_stmt = node.body[0].orelse[0] self.assertEqual(elif_stmt.lineno, 3) self.assertEqual(elif_stmt.col_offset, 0) def test_starred_expr_end_position_within_call(self): node = ast.parse('f(*[0, 1])') starred_expr = node.body[0].value.args[0] self.assertEqual(starred_expr.end_lineno, 1) self.assertEqual(starred_expr.end_col_offset, 9) def test_literal_eval(self): self.assertEqual(ast.literal_eval('[1, 2, 3]'), [1, 2, 3]) self.assertEqual(ast.literal_eval('{"foo": 42}'), {"foo": 42}) self.assertEqual(ast.literal_eval('(True, False, None)'), (True, False, None)) self.assertEqual(ast.literal_eval('{1, 2, 3}'), {1, 2, 3}) self.assertEqual(ast.literal_eval('b"hi"'), b"hi") self.assertEqual(ast.literal_eval('set()'), set()) self.assertRaises(ValueError, ast.literal_eval, 'foo()') self.assertEqual(ast.literal_eval('6'), 6) self.assertEqual(ast.literal_eval('+6'), 6) self.assertEqual(ast.literal_eval('-6'), -6) self.assertEqual(ast.literal_eval('3.25'), 3.25) self.assertEqual(ast.literal_eval('+3.25'), 3.25) self.assertEqual(ast.literal_eval('-3.25'), -3.25) self.assertEqual(repr(ast.literal_eval('-0.0')), '-0.0') self.assertRaises(ValueError, ast.literal_eval, '++6') self.assertRaises(ValueError, ast.literal_eval, '+True') self.assertRaises(ValueError, ast.literal_eval, '2+3') def test_literal_eval_str_int_limit(self): with support.adjust_int_max_str_digits(4000): ast.literal_eval('3'*4000) # no error with self.assertRaises(SyntaxError) as err_ctx: ast.literal_eval('3'*4001) self.assertIn('Exceeds the limit ', str(err_ctx.exception)) self.assertIn(' Consider hexadecimal ', str(err_ctx.exception)) def test_literal_eval_complex(self): # Issue #4907 self.assertEqual(ast.literal_eval('6j'), 6j) self.assertEqual(ast.literal_eval('-6j'), -6j) self.assertEqual(ast.literal_eval('6.75j'), 6.75j) self.assertEqual(ast.literal_eval('-6.75j'), -6.75j) self.assertEqual(ast.literal_eval('3+6j'), 3+6j) self.assertEqual(ast.literal_eval('-3+6j'), -3+6j) self.assertEqual(ast.literal_eval('3-6j'), 3-6j) self.assertEqual(ast.literal_eval('-3-6j'), -3-6j) self.assertEqual(ast.literal_eval('3.25+6.75j'), 3.25+6.75j) self.assertEqual(ast.literal_eval('-3.25+6.75j'), -3.25+6.75j) self.assertEqual(ast.literal_eval('3.25-6.75j'), 3.25-6.75j) self.assertEqual(ast.literal_eval('-3.25-6.75j'), -3.25-6.75j) self.assertEqual(ast.literal_eval('(3+6j)'), 3+6j) self.assertRaises(ValueError, ast.literal_eval, '-6j+3') self.assertRaises(ValueError, ast.literal_eval, '-6j+3j') self.assertRaises(ValueError, ast.literal_eval, '3+-6j') self.assertRaises(ValueError, ast.literal_eval, '3+(0+6j)') self.assertRaises(ValueError, ast.literal_eval, '-(3+6j)') def test_literal_eval_malformed_dict_nodes(self): malformed = ast.Dict(keys=[ast.Constant(1), ast.Constant(2)], values=[ast.Constant(3)]) self.assertRaises(ValueError, ast.literal_eval, malformed) malformed = ast.Dict(keys=[ast.Constant(1)], values=[ast.Constant(2), ast.Constant(3)]) self.assertRaises(ValueError, ast.literal_eval, malformed) def test_literal_eval_trailing_ws(self): self.assertEqual(ast.literal_eval(" -1"), -1) self.assertEqual(ast.literal_eval("\t\t-1"), -1) self.assertEqual(ast.literal_eval(" \t -1"), -1) self.assertRaises(IndentationError, ast.literal_eval, "\n -1") def test_literal_eval_malformed_lineno(self): msg = r'malformed node or string on line 3:' with self.assertRaisesRegex(ValueError, msg): ast.literal_eval("{'a': 1,\n'b':2,\n'c':++3,\n'd':4}") node = ast.UnaryOp( ast.UAdd(), ast.UnaryOp(ast.UAdd(), ast.Constant(6))) self.assertIsNone(getattr(node, 'lineno', None)) msg = r'malformed node or string:' with self.assertRaisesRegex(ValueError, msg): ast.literal_eval(node) def test_literal_eval_syntax_errors(self): with self.assertRaisesRegex(SyntaxError, "unexpected indent"): ast.literal_eval(r''' \ (\ \ ''') def test_bad_integer(self): # issue13436: Bad error message with invalid numeric values body = [ast.ImportFrom(module='time', names=[ast.alias(name='sleep')], level=None, lineno=None, col_offset=None)] mod = ast.Module(body, []) with self.assertRaises(ValueError) as cm: compile(mod, 'test', 'exec') self.assertIn("invalid integer value: None", str(cm.exception)) def test_level_as_none(self): body = [ast.ImportFrom(module='time', names=[ast.alias(name='sleep', lineno=0, col_offset=0)], level=None, lineno=0, col_offset=0)] mod = ast.Module(body, []) code = compile(mod, 'test', 'exec') ns = {} exec(code, ns) self.assertIn('sleep', ns) def test_recursion_direct(self): e = ast.UnaryOp(op=ast.Not(), lineno=0, col_offset=0, operand=ast.Constant(1)) e.operand = e with self.assertRaises(RecursionError): with support.infinite_recursion(): compile(ast.Expression(e), "", "eval") def test_recursion_indirect(self): e = ast.UnaryOp(op=ast.Not(), lineno=0, col_offset=0, operand=ast.Constant(1)) f = ast.UnaryOp(op=ast.Not(), lineno=0, col_offset=0, operand=ast.Constant(1)) e.operand = f f.operand = e with self.assertRaises(RecursionError): with support.infinite_recursion(): compile(ast.Expression(e), "", "eval") class ASTValidatorTests(unittest.TestCase): def mod(self, mod, msg=None, mode="exec", *, exc=ValueError): mod.lineno = mod.col_offset = 0 ast.fix_missing_locations(mod) if msg is None: compile(mod, "", mode) else: with self.assertRaises(exc) as cm: compile(mod, "", mode) self.assertIn(msg, str(cm.exception)) def expr(self, node, msg=None, *, exc=ValueError): mod = ast.Module([ast.Expr(node)], []) self.mod(mod, msg, exc=exc) def stmt(self, stmt, msg=None): mod = ast.Module([stmt], []) self.mod(mod, msg) def test_module(self): m = ast.Interactive([ast.Expr(ast.Name("x", ast.Store()))]) self.mod(m, "must have Load context", "single") m = ast.Expression(ast.Name("x", ast.Store())) self.mod(m, "must have Load context", "eval") def _check_arguments(self, fac, check): def arguments(args=None, posonlyargs=None, vararg=None, kwonlyargs=None, kwarg=None, defaults=None, kw_defaults=None): if args is None: args = [] if posonlyargs is None: posonlyargs = [] if kwonlyargs is None: kwonlyargs = [] if defaults is None: defaults = [] if kw_defaults is None: kw_defaults = [] args = ast.arguments(args, posonlyargs, vararg, kwonlyargs, kw_defaults, kwarg, defaults) return fac(args) args = [ast.arg("x", ast.Name("x", ast.Store()))] check(arguments(args=args), "must have Load context") check(arguments(posonlyargs=args), "must have Load context") check(arguments(kwonlyargs=args), "must have Load context") check(arguments(defaults=[ast.Constant(3)]), "more positional defaults than args") check(arguments(kw_defaults=[ast.Constant(4)]), "length of kwonlyargs is not the same as kw_defaults") args = [ast.arg("x", ast.Name("x", ast.Load()))] check(arguments(args=args, defaults=[ast.Name("x", ast.Store())]), "must have Load context") args = [ast.arg("a", ast.Name("x", ast.Load())), ast.arg("b", ast.Name("y", ast.Load()))] check(arguments(kwonlyargs=args, kw_defaults=[None, ast.Name("x", ast.Store())]), "must have Load context") def test_funcdef(self): a = ast.arguments([], [], None, [], [], None, []) f = ast.FunctionDef("x", a, [], [], None, None, []) self.stmt(f, "empty body on FunctionDef") f = ast.FunctionDef("x", a, [ast.Pass()], [ast.Name("x", ast.Store())], None, None, []) self.stmt(f, "must have Load context") f = ast.FunctionDef("x", a, [ast.Pass()], [], ast.Name("x", ast.Store()), None, []) self.stmt(f, "must have Load context") f = ast.FunctionDef("x", ast.arguments(), [ast.Pass()]) self.stmt(f) def fac(args): return ast.FunctionDef("x", args, [ast.Pass()], [], None, None, []) self._check_arguments(fac, self.stmt) def test_funcdef_pattern_matching(self): # gh-104799: New fields on FunctionDef should be added at the end def matcher(node): match node: case ast.FunctionDef("foo", ast.arguments(args=[ast.arg("bar")]), [ast.Pass()], [ast.Name("capybara", ast.Load())], ast.Name("pacarana", ast.Load())): return True case _: return False code = """ @capybara def foo(bar) -> pacarana: pass """ source = ast.parse(textwrap.dedent(code)) funcdef = source.body[0] self.assertIsInstance(funcdef, ast.FunctionDef) self.assertTrue(matcher(funcdef)) def test_classdef(self): def cls(bases=None, keywords=None, body=None, decorator_list=None, type_params=None): if bases is None: bases = [] if keywords is None: keywords = [] if body is None: body = [ast.Pass()] if decorator_list is None: decorator_list = [] if type_params is None: type_params = [] return ast.ClassDef("myclass", bases, keywords, body, decorator_list, type_params) self.stmt(cls(bases=[ast.Name("x", ast.Store())]), "must have Load context") self.stmt(cls(keywords=[ast.keyword("x", ast.Name("x", ast.Store()))]), "must have Load context") self.stmt(cls(body=[]), "empty body on ClassDef") self.stmt(cls(body=[None]), "None disallowed") self.stmt(cls(decorator_list=[ast.Name("x", ast.Store())]), "must have Load context") def test_delete(self): self.stmt(ast.Delete([]), "empty targets on Delete") self.stmt(ast.Delete([None]), "None disallowed") self.stmt(ast.Delete([ast.Name("x", ast.Load())]), "must have Del context") def test_assign(self): self.stmt(ast.Assign([], ast.Constant(3)), "empty targets on Assign") self.stmt(ast.Assign([None], ast.Constant(3)), "None disallowed") self.stmt(ast.Assign([ast.Name("x", ast.Load())], ast.Constant(3)), "must have Store context") self.stmt(ast.Assign([ast.Name("x", ast.Store())], ast.Name("y", ast.Store())), "must have Load context") def test_augassign(self): aug = ast.AugAssign(ast.Name("x", ast.Load()), ast.Add(), ast.Name("y", ast.Load())) self.stmt(aug, "must have Store context") aug = ast.AugAssign(ast.Name("x", ast.Store()), ast.Add(), ast.Name("y", ast.Store())) self.stmt(aug, "must have Load context") def test_for(self): x = ast.Name("x", ast.Store()) y = ast.Name("y", ast.Load()) p = ast.Pass() self.stmt(ast.For(x, y, [], []), "empty body on For") self.stmt(ast.For(ast.Name("x", ast.Load()), y, [p], []), "must have Store context") self.stmt(ast.For(x, ast.Name("y", ast.Store()), [p], []), "must have Load context") e = ast.Expr(ast.Name("x", ast.Store())) self.stmt(ast.For(x, y, [e], []), "must have Load context") self.stmt(ast.For(x, y, [p], [e]), "must have Load context") def test_while(self): self.stmt(ast.While(ast.Constant(3), [], []), "empty body on While") self.stmt(ast.While(ast.Name("x", ast.Store()), [ast.Pass()], []), "must have Load context") self.stmt(ast.While(ast.Constant(3), [ast.Pass()], [ast.Expr(ast.Name("x", ast.Store()))]), "must have Load context") def test_if(self): self.stmt(ast.If(ast.Constant(3), [], []), "empty body on If") i = ast.If(ast.Name("x", ast.Store()), [ast.Pass()], []) self.stmt(i, "must have Load context") i = ast.If(ast.Constant(3), [ast.Expr(ast.Name("x", ast.Store()))], []) self.stmt(i, "must have Load context") i = ast.If(ast.Constant(3), [ast.Pass()], [ast.Expr(ast.Name("x", ast.Store()))]) self.stmt(i, "must have Load context") def test_with(self): p = ast.Pass() self.stmt(ast.With([], [p]), "empty items on With") i = ast.withitem(ast.Constant(3), None) self.stmt(ast.With([i], []), "empty body on With") i = ast.withitem(ast.Name("x", ast.Store()), None) self.stmt(ast.With([i], [p]), "must have Load context") i = ast.withitem(ast.Constant(3), ast.Name("x", ast.Load())) self.stmt(ast.With([i], [p]), "must have Store context") def test_raise(self): r = ast.Raise(None, ast.Constant(3)) self.stmt(r, "Raise with cause but no exception") r = ast.Raise(ast.Name("x", ast.Store()), None) self.stmt(r, "must have Load context") r = ast.Raise(ast.Constant(4), ast.Name("x", ast.Store())) self.stmt(r, "must have Load context") def test_try(self): p = ast.Pass() t = ast.Try([], [], [], [p]) self.stmt(t, "empty body on Try") t = ast.Try([ast.Expr(ast.Name("x", ast.Store()))], [], [], [p]) self.stmt(t, "must have Load context") t = ast.Try([p], [], [], []) self.stmt(t, "Try has neither except handlers nor finalbody") t = ast.Try([p], [], [p], [p]) self.stmt(t, "Try has orelse but no except handlers") t = ast.Try([p], [ast.ExceptHandler(None, "x", [])], [], []) self.stmt(t, "empty body on ExceptHandler") e = [ast.ExceptHandler(ast.Name("x", ast.Store()), "y", [p])] self.stmt(ast.Try([p], e, [], []), "must have Load context") e = [ast.ExceptHandler(None, "x", [p])] t = ast.Try([p], e, [ast.Expr(ast.Name("x", ast.Store()))], [p]) self.stmt(t, "must have Load context") t = ast.Try([p], e, [p], [ast.Expr(ast.Name("x", ast.Store()))]) self.stmt(t, "must have Load context") def test_try_star(self): p = ast.Pass() t = ast.TryStar([], [], [], [p]) self.stmt(t, "empty body on TryStar") t = ast.TryStar([ast.Expr(ast.Name("x", ast.Store()))], [], [], [p]) self.stmt(t, "must have Load context") t = ast.TryStar([p], [], [], []) self.stmt(t, "TryStar has neither except handlers nor finalbody") t = ast.TryStar([p], [], [p], [p]) self.stmt(t, "TryStar has orelse but no except handlers") t = ast.TryStar([p], [ast.ExceptHandler(None, "x", [])], [], []) self.stmt(t, "empty body on ExceptHandler") e = [ast.ExceptHandler(ast.Name("x", ast.Store()), "y", [p])] self.stmt(ast.TryStar([p], e, [], []), "must have Load context") e = [ast.ExceptHandler(None, "x", [p])] t = ast.TryStar([p], e, [ast.Expr(ast.Name("x", ast.Store()))], [p]) self.stmt(t, "must have Load context") t = ast.TryStar([p], e, [p], [ast.Expr(ast.Name("x", ast.Store()))]) self.stmt(t, "must have Load context") def test_assert(self): self.stmt(ast.Assert(ast.Name("x", ast.Store()), None), "must have Load context") assrt = ast.Assert(ast.Name("x", ast.Load()), ast.Name("y", ast.Store())) self.stmt(assrt, "must have Load context") def test_import(self): self.stmt(ast.Import([]), "empty names on Import") def test_importfrom(self): imp = ast.ImportFrom(None, [ast.alias("x", None)], -42) self.stmt(imp, "Negative ImportFrom level") self.stmt(ast.ImportFrom(None, [], 0), "empty names on ImportFrom") def test_global(self): self.stmt(ast.Global([]), "empty names on Global") def test_nonlocal(self): self.stmt(ast.Nonlocal([]), "empty names on Nonlocal") def test_expr(self): e = ast.Expr(ast.Name("x", ast.Store())) self.stmt(e, "must have Load context") def test_boolop(self): b = ast.BoolOp(ast.And(), []) self.expr(b, "less than 2 values") b = ast.BoolOp(ast.And(), [ast.Constant(3)]) self.expr(b, "less than 2 values") b = ast.BoolOp(ast.And(), [ast.Constant(4), None]) self.expr(b, "None disallowed") b = ast.BoolOp(ast.And(), [ast.Constant(4), ast.Name("x", ast.Store())]) self.expr(b, "must have Load context") def test_unaryop(self): u = ast.UnaryOp(ast.Not(), ast.Name("x", ast.Store())) self.expr(u, "must have Load context") def test_lambda(self): a = ast.arguments([], [], None, [], [], None, []) self.expr(ast.Lambda(a, ast.Name("x", ast.Store())), "must have Load context") def fac(args): return ast.Lambda(args, ast.Name("x", ast.Load())) self._check_arguments(fac, self.expr) def test_ifexp(self): l = ast.Name("x", ast.Load()) s = ast.Name("y", ast.Store()) for args in (s, l, l), (l, s, l), (l, l, s): self.expr(ast.IfExp(*args), "must have Load context") def test_dict(self): d = ast.Dict([], [ast.Name("x", ast.Load())]) self.expr(d, "same number of keys as values") d = ast.Dict([ast.Name("x", ast.Load())], [None]) self.expr(d, "None disallowed") def test_set(self): self.expr(ast.Set([None]), "None disallowed") s = ast.Set([ast.Name("x", ast.Store())]) self.expr(s, "must have Load context") def _check_comprehension(self, fac): self.expr(fac([]), "comprehension with no generators") g = ast.comprehension(ast.Name("x", ast.Load()), ast.Name("x", ast.Load()), [], 0) self.expr(fac([g]), "must have Store context") g = ast.comprehension(ast.Name("x", ast.Store()), ast.Name("x", ast.Store()), [], 0) self.expr(fac([g]), "must have Load context") x = ast.Name("x", ast.Store()) y = ast.Name("y", ast.Load()) g = ast.comprehension(x, y, [None], 0) self.expr(fac([g]), "None disallowed") g = ast.comprehension(x, y, [ast.Name("x", ast.Store())], 0) self.expr(fac([g]), "must have Load context") def _simple_comp(self, fac): g = ast.comprehension(ast.Name("x", ast.Store()), ast.Name("x", ast.Load()), [], 0) self.expr(fac(ast.Name("x", ast.Store()), [g]), "must have Load context") def wrap(gens): return fac(ast.Name("x", ast.Store()), gens) self._check_comprehension(wrap) def test_listcomp(self): self._simple_comp(ast.ListComp) def test_setcomp(self): self._simple_comp(ast.SetComp) def test_generatorexp(self): self._simple_comp(ast.GeneratorExp) def test_dictcomp(self): g = ast.comprehension(ast.Name("y", ast.Store()), ast.Name("p", ast.Load()), [], 0) c = ast.DictComp(ast.Name("x", ast.Store()), ast.Name("y", ast.Load()), [g]) self.expr(c, "must have Load context") c = ast.DictComp(ast.Name("x", ast.Load()), ast.Name("y", ast.Store()), [g]) self.expr(c, "must have Load context") def factory(comps): k = ast.Name("x", ast.Load()) v = ast.Name("y", ast.Load()) return ast.DictComp(k, v, comps) self._check_comprehension(factory) def test_yield(self): self.expr(ast.Yield(ast.Name("x", ast.Store())), "must have Load") self.expr(ast.YieldFrom(ast.Name("x", ast.Store())), "must have Load") def test_compare(self): left = ast.Name("x", ast.Load()) comp = ast.Compare(left, [ast.In()], []) self.expr(comp, "no comparators") comp = ast.Compare(left, [ast.In()], [ast.Constant(4), ast.Constant(5)]) self.expr(comp, "different number of comparators and operands") comp = ast.Compare(ast.Constant("blah"), [ast.In()], [left]) self.expr(comp) comp = ast.Compare(left, [ast.In()], [ast.Constant("blah")]) self.expr(comp) def test_call(self): func = ast.Name("x", ast.Load()) args = [ast.Name("y", ast.Load())] keywords = [ast.keyword("w", ast.Name("z", ast.Load()))] call = ast.Call(ast.Name("x", ast.Store()), args, keywords) self.expr(call, "must have Load context") call = ast.Call(func, [None], keywords) self.expr(call, "None disallowed") bad_keywords = [ast.keyword("w", ast.Name("z", ast.Store()))] call = ast.Call(func, args, bad_keywords) self.expr(call, "must have Load context") def test_attribute(self): attr = ast.Attribute(ast.Name("x", ast.Store()), "y", ast.Load()) self.expr(attr, "must have Load context") def test_subscript(self): sub = ast.Subscript(ast.Name("x", ast.Store()), ast.Constant(3), ast.Load()) self.expr(sub, "must have Load context") x = ast.Name("x", ast.Load()) sub = ast.Subscript(x, ast.Name("y", ast.Store()), ast.Load()) self.expr(sub, "must have Load context") s = ast.Name("x", ast.Store()) for args in (s, None, None), (None, s, None), (None, None, s): sl = ast.Slice(*args) self.expr(ast.Subscript(x, sl, ast.Load()), "must have Load context") sl = ast.Tuple([], ast.Load()) self.expr(ast.Subscript(x, sl, ast.Load())) sl = ast.Tuple([s], ast.Load()) self.expr(ast.Subscript(x, sl, ast.Load()), "must have Load context") def test_starred(self): left = ast.List([ast.Starred(ast.Name("x", ast.Load()), ast.Store())], ast.Store()) assign = ast.Assign([left], ast.Constant(4)) self.stmt(assign, "must have Store context") def _sequence(self, fac): self.expr(fac([None], ast.Load()), "None disallowed") self.expr(fac([ast.Name("x", ast.Store())], ast.Load()), "must have Load context") def test_list(self): self._sequence(ast.List) def test_tuple(self): self._sequence(ast.Tuple) @support.requires_resource('cpu') def test_stdlib_validates(self): for module in STDLIB_FILES: with self.subTest(module): fn = os.path.join(STDLIB, module) with open(fn, "r", encoding="utf-8") as fp: source = fp.read() mod = ast.parse(source, fn) compile(mod, fn, "exec") mod2 = ast.parse(source, fn) self.assertTrue(ast.compare(mod, mod2)) constant_1 = ast.Constant(1) pattern_1 = ast.MatchValue(constant_1) constant_x = ast.Constant('x') pattern_x = ast.MatchValue(constant_x) constant_true = ast.Constant(True) pattern_true = ast.MatchSingleton(True) name_carter = ast.Name('carter', ast.Load()) _MATCH_PATTERNS = [ ast.MatchValue( ast.Attribute( ast.Attribute( ast.Name('x', ast.Store()), 'y', ast.Load() ), 'z', ast.Load() ) ), ast.MatchValue( ast.Attribute( ast.Attribute( ast.Name('x', ast.Load()), 'y', ast.Store() ), 'z', ast.Load() ) ), ast.MatchValue( ast.Constant(...) ), ast.MatchValue( ast.Constant(True) ), ast.MatchValue( ast.Constant((1,2,3)) ), ast.MatchSingleton('string'), ast.MatchSequence([ ast.MatchSingleton('string') ]), ast.MatchSequence( [ ast.MatchSequence( [ ast.MatchSingleton('string') ] ) ] ), ast.MatchMapping( [constant_1, constant_true], [pattern_x] ), ast.MatchMapping( [constant_true, constant_1], [pattern_x, pattern_1], rest='True' ), ast.MatchMapping( [constant_true, ast.Starred(ast.Name('lol', ast.Load()), ast.Load())], [pattern_x, pattern_1], rest='legit' ), ast.MatchClass( ast.Attribute( ast.Attribute( constant_x, 'y', ast.Load()), 'z', ast.Load()), patterns=[], kwd_attrs=[], kwd_patterns=[] ), ast.MatchClass( name_carter, patterns=[], kwd_attrs=['True'], kwd_patterns=[pattern_1] ), ast.MatchClass( name_carter, patterns=[], kwd_attrs=[], kwd_patterns=[pattern_1] ), ast.MatchClass( name_carter, patterns=[ast.MatchSingleton('string')], kwd_attrs=[], kwd_patterns=[] ), ast.MatchClass( name_carter, patterns=[ast.MatchStar()], kwd_attrs=[], kwd_patterns=[] ), ast.MatchClass( name_carter, patterns=[], kwd_attrs=[], kwd_patterns=[ast.MatchStar()] ), ast.MatchClass( constant_true, # invalid name patterns=[], kwd_attrs=['True'], kwd_patterns=[pattern_1] ), ast.MatchSequence( [ ast.MatchStar("True") ] ), ast.MatchAs( name='False' ), ast.MatchOr( [] ), ast.MatchOr( [pattern_1] ), ast.MatchOr( [pattern_1, pattern_x, ast.MatchSingleton('xxx')] ), ast.MatchAs(name="_"), ast.MatchStar(name="x"), ast.MatchSequence([ast.MatchStar("_")]), ast.MatchMapping([], [], rest="_"), ] def test_match_validation_pattern(self): name_x = ast.Name('x', ast.Load()) for pattern in self._MATCH_PATTERNS: with self.subTest(ast.dump(pattern, indent=4)): node = ast.Match( subject=name_x, cases = [ ast.match_case( pattern=pattern, body = [ast.Pass()] ) ] ) node = ast.fix_missing_locations(node) module = ast.Module([node], []) with self.assertRaises(ValueError): compile(module, "", "exec") class ConstantTests(unittest.TestCase): """Tests on the ast.Constant node type.""" def compile_constant(self, value): tree = ast.parse("x = 123") node = tree.body[0].value new_node = ast.Constant(value=value) ast.copy_location(new_node, node) tree.body[0].value = new_node code = compile(tree, "", "exec") ns = {} exec(code, ns) return ns['x'] def test_validation(self): with self.assertRaises(TypeError) as cm: self.compile_constant([1, 2, 3]) self.assertEqual(str(cm.exception), "got an invalid type in Constant: list") def test_singletons(self): for const in (None, False, True, Ellipsis, b'', frozenset()): with self.subTest(const=const): value = self.compile_constant(const) self.assertIs(value, const) def test_values(self): nested_tuple = (1,) nested_frozenset = frozenset({1}) for level in range(3): nested_tuple = (nested_tuple, 2) nested_frozenset = frozenset({nested_frozenset, 2}) values = (123, 123.0, 123j, "unicode", b'bytes', tuple("tuple"), frozenset("frozenset"), nested_tuple, nested_frozenset) for value in values: with self.subTest(value=value): result = self.compile_constant(value) self.assertEqual(result, value) def test_assign_to_constant(self): tree = ast.parse("x = 1") target = tree.body[0].targets[0] new_target = ast.Constant(value=1) ast.copy_location(new_target, target) tree.body[0].targets[0] = new_target with self.assertRaises(ValueError) as cm: compile(tree, "string", "exec") self.assertEqual(str(cm.exception), "expression which can't be assigned " "to in Store context") def test_get_docstring(self): tree = ast.parse("'docstring'\nx = 1") self.assertEqual(ast.get_docstring(tree), 'docstring') def get_load_const(self, tree): # Compile to bytecode, disassemble and get parameter of LOAD_CONST # instructions co = compile(tree, '', 'exec') consts = [] for instr in dis.get_instructions(co): if instr.opname == 'LOAD_CONST' or instr.opname == 'RETURN_CONST': consts.append(instr.argval) return consts @support.cpython_only def test_load_const(self): consts = [None, True, False, 124, 2.0, 3j, "unicode", b'bytes', (1, 2, 3)] code = '\n'.join(['x={!r}'.format(const) for const in consts]) code += '\nx = ...' consts.extend((Ellipsis, None)) tree = ast.parse(code) self.assertEqual(self.get_load_const(tree), consts) # Replace expression nodes with constants for assign, const in zip(tree.body, consts): assert isinstance(assign, ast.Assign), ast.dump(assign) new_node = ast.Constant(value=const) ast.copy_location(new_node, assign.value) assign.value = new_node self.assertEqual(self.get_load_const(tree), consts) def test_literal_eval(self): tree = ast.parse("1 + 2") binop = tree.body[0].value new_left = ast.Constant(value=10) ast.copy_location(new_left, binop.left) binop.left = new_left new_right = ast.Constant(value=20j) ast.copy_location(new_right, binop.right) binop.right = new_right self.assertEqual(ast.literal_eval(binop), 10+20j) def test_string_kind(self): c = ast.parse('"x"', mode='eval').body self.assertEqual(c.value, "x") self.assertEqual(c.kind, None) c = ast.parse('u"x"', mode='eval').body self.assertEqual(c.value, "x") self.assertEqual(c.kind, "u") c = ast.parse('r"x"', mode='eval').body self.assertEqual(c.value, "x") self.assertEqual(c.kind, None) c = ast.parse('b"x"', mode='eval').body self.assertEqual(c.value, b"x") self.assertEqual(c.kind, None) class EndPositionTests(unittest.TestCase): """Tests for end position of AST nodes. Testing end positions of nodes requires a bit of extra care because of how LL parsers work. """ def _check_end_pos(self, ast_node, end_lineno, end_col_offset): self.assertEqual(ast_node.end_lineno, end_lineno) self.assertEqual(ast_node.end_col_offset, end_col_offset) def _check_content(self, source, ast_node, content): self.assertEqual(ast.get_source_segment(source, ast_node), content) def _parse_value(self, s): # Use duck-typing to support both single expression # and a right hand side of an assignment statement. return ast.parse(s).body[0].value def test_lambda(self): s = 'lambda x, *y: None' lam = self._parse_value(s) self._check_content(s, lam.body, 'None') self._check_content(s, lam.args.args[0], 'x') self._check_content(s, lam.args.vararg, 'y') def test_func_def(self): s = dedent(''' def func(x: int, *args: str, z: float = 0, **kwargs: Any) -> bool: return True ''').strip() fdef = ast.parse(s).body[0] self._check_end_pos(fdef, 5, 15) self._check_content(s, fdef.body[0], 'return True') self._check_content(s, fdef.args.args[0], 'x: int') self._check_content(s, fdef.args.args[0].annotation, 'int') self._check_content(s, fdef.args.kwarg, 'kwargs: Any') self._check_content(s, fdef.args.kwarg.annotation, 'Any') def test_call(self): s = 'func(x, y=2, **kw)' call = self._parse_value(s) self._check_content(s, call.func, 'func') self._check_content(s, call.keywords[0].value, '2') self._check_content(s, call.keywords[1].value, 'kw') def test_call_noargs(self): s = 'x[0]()' call = self._parse_value(s) self._check_content(s, call.func, 'x[0]') self._check_end_pos(call, 1, 6) def test_class_def(self): s = dedent(''' class C(A, B): x: int = 0 ''').strip() cdef = ast.parse(s).body[0] self._check_end_pos(cdef, 2, 14) self._check_content(s, cdef.bases[1], 'B') self._check_content(s, cdef.body[0], 'x: int = 0') def test_class_kw(self): s = 'class S(metaclass=abc.ABCMeta): pass' cdef = ast.parse(s).body[0] self._check_content(s, cdef.keywords[0].value, 'abc.ABCMeta') def test_multi_line_str(self): s = dedent(''' x = """Some multi-line text. It goes on starting from same indent.""" ''').strip() assign = ast.parse(s).body[0] self._check_end_pos(assign, 3, 40) self._check_end_pos(assign.value, 3, 40) def test_continued_str(self): s = dedent(''' x = "first part" \\ "second part" ''').strip() assign = ast.parse(s).body[0] self._check_end_pos(assign, 2, 13) self._check_end_pos(assign.value, 2, 13) def test_suites(self): # We intentionally put these into the same string to check # that empty lines are not part of the suite. s = dedent(''' while True: pass if one(): x = None elif other(): y = None else: z = None for x, y in stuff: assert True try: raise RuntimeError except TypeError as e: pass pass ''').strip() mod = ast.parse(s) while_loop = mod.body[0] if_stmt = mod.body[1] for_loop = mod.body[2] try_stmt = mod.body[3] pass_stmt = mod.body[4] self._check_end_pos(while_loop, 2, 8) self._check_end_pos(if_stmt, 9, 12) self._check_end_pos(for_loop, 12, 15) self._check_end_pos(try_stmt, 17, 8) self._check_end_pos(pass_stmt, 19, 4) self._check_content(s, while_loop.test, 'True') self._check_content(s, if_stmt.body[0], 'x = None') self._check_content(s, if_stmt.orelse[0].test, 'other()') self._check_content(s, for_loop.target, 'x, y') self._check_content(s, try_stmt.body[0], 'raise RuntimeError') self._check_content(s, try_stmt.handlers[0].type, 'TypeError') def test_fstring(self): s = 'x = f"abc {x + y} abc"' fstr = self._parse_value(s) binop = fstr.values[1].value self._check_content(s, binop, 'x + y') def test_fstring_multi_line(self): s = dedent(''' f"""Some multi-line text. { arg_one + arg_two } It goes on...""" ''').strip() fstr = self._parse_value(s) binop = fstr.values[1].value self._check_end_pos(binop, 5, 7) self._check_content(s, binop.left, 'arg_one') self._check_content(s, binop.right, 'arg_two') def test_import_from_multi_line(self): s = dedent(''' from x.y.z import ( a, b, c as c ) ''').strip() imp = ast.parse(s).body[0] self._check_end_pos(imp, 3, 1) self._check_end_pos(imp.names[2], 2, 16) def test_slices(self): s1 = 'f()[1, 2] [0]' s2 = 'x[ a.b: c.d]' sm = dedent(''' x[ a.b: f () , g () : c.d ] ''').strip() i1, i2, im = map(self._parse_value, (s1, s2, sm)) self._check_content(s1, i1.value, 'f()[1, 2]') self._check_content(s1, i1.value.slice, '1, 2') self._check_content(s2, i2.slice.lower, 'a.b') self._check_content(s2, i2.slice.upper, 'c.d') self._check_content(sm, im.slice.elts[0].upper, 'f ()') self._check_content(sm, im.slice.elts[1].lower, 'g ()') self._check_end_pos(im, 3, 3) def test_binop(self): s = dedent(''' (1 * 2 + (3 ) + 4 ) ''').strip() binop = self._parse_value(s) self._check_end_pos(binop, 2, 6) self._check_content(s, binop.right, '4') self._check_content(s, binop.left, '1 * 2 + (3 )') self._check_content(s, binop.left.right, '3') def test_boolop(self): s = dedent(''' if (one_condition and (other_condition or yet_another_one)): pass ''').strip() bop = ast.parse(s).body[0].test self._check_end_pos(bop, 2, 44) self._check_content(s, bop.values[1], 'other_condition or yet_another_one') def test_tuples(self): s1 = 'x = () ;' s2 = 'x = 1 , ;' s3 = 'x = (1 , 2 ) ;' sm = dedent(''' x = ( a, b, ) ''').strip() t1, t2, t3, tm = map(self._parse_value, (s1, s2, s3, sm)) self._check_content(s1, t1, '()') self._check_content(s2, t2, '1 ,') self._check_content(s3, t3, '(1 , 2 )') self._check_end_pos(tm, 3, 1) def test_attribute_spaces(self): s = 'func(x. y .z)' call = self._parse_value(s) self._check_content(s, call, s) self._check_content(s, call.args[0], 'x. y .z') def test_redundant_parenthesis(self): s = '( ( ( a + b ) ) )' v = ast.parse(s).body[0].value self.assertEqual(type(v).__name__, 'BinOp') self._check_content(s, v, 'a + b') s2 = 'await ' + s v = ast.parse(s2).body[0].value.value self.assertEqual(type(v).__name__, 'BinOp') self._check_content(s2, v, 'a + b') def test_trailers_with_redundant_parenthesis(self): tests = ( ('( ( ( a ) ) ) ( )', 'Call'), ('( ( ( a ) ) ) ( b )', 'Call'), ('( ( ( a ) ) ) [ b ]', 'Subscript'), ('( ( ( a ) ) ) . b', 'Attribute'), ) for s, t in tests: with self.subTest(s): v = ast.parse(s).body[0].value self.assertEqual(type(v).__name__, t) self._check_content(s, v, s) s2 = 'await ' + s v = ast.parse(s2).body[0].value.value self.assertEqual(type(v).__name__, t) self._check_content(s2, v, s) def test_displays(self): s1 = '[{}, {1, }, {1, 2,} ]' s2 = '{a: b, f (): g () ,}' c1 = self._parse_value(s1) c2 = self._parse_value(s2) self._check_content(s1, c1.elts[0], '{}') self._check_content(s1, c1.elts[1], '{1, }') self._check_content(s1, c1.elts[2], '{1, 2,}') self._check_content(s2, c2.keys[1], 'f ()') self._check_content(s2, c2.values[1], 'g ()') def test_comprehensions(self): s = dedent(''' x = [{x for x, y in stuff if cond.x} for stuff in things] ''').strip() cmp = self._parse_value(s) self._check_end_pos(cmp, 2, 37) self._check_content(s, cmp.generators[0].iter, 'things') self._check_content(s, cmp.elt.generators[0].iter, 'stuff') self._check_content(s, cmp.elt.generators[0].ifs[0], 'cond.x') self._check_content(s, cmp.elt.generators[0].target, 'x, y') def test_yield_await(self): s = dedent(''' async def f(): yield x await y ''').strip() fdef = ast.parse(s).body[0] self._check_content(s, fdef.body[0].value, 'yield x') self._check_content(s, fdef.body[1].value, 'await y') def test_source_segment_multi(self): s_orig = dedent(''' x = ( a, b, ) + () ''').strip() s_tuple = dedent(''' ( a, b, ) ''').strip() binop = self._parse_value(s_orig) self.assertEqual(ast.get_source_segment(s_orig, binop.left), s_tuple) def test_source_segment_padded(self): s_orig = dedent(''' class C: def fun(self) -> None: "ЖЖЖЖЖ" ''').strip() s_method = ' def fun(self) -> None:\n' \ ' "ЖЖЖЖЖ"' cdef = ast.parse(s_orig).body[0] self.assertEqual(ast.get_source_segment(s_orig, cdef.body[0], padded=True), s_method) def test_source_segment_endings(self): s = 'v = 1\r\nw = 1\nx = 1\n\ry = 1\rz = 1\r\n' v, w, x, y, z = ast.parse(s).body self._check_content(s, v, 'v = 1') self._check_content(s, w, 'w = 1') self._check_content(s, x, 'x = 1') self._check_content(s, y, 'y = 1') self._check_content(s, z, 'z = 1') def test_source_segment_tabs(self): s = dedent(''' class C: \t\f def fun(self) -> None: \t\f pass ''').strip() s_method = ' \t\f def fun(self) -> None:\n' \ ' \t\f pass' cdef = ast.parse(s).body[0] self.assertEqual(ast.get_source_segment(s, cdef.body[0], padded=True), s_method) def test_source_segment_newlines(self): s = 'def f():\n pass\ndef g():\r pass\r\ndef h():\r\n pass\r\n' f, g, h = ast.parse(s).body self._check_content(s, f, 'def f():\n pass') self._check_content(s, g, 'def g():\r pass') self._check_content(s, h, 'def h():\r\n pass') s = 'def f():\n a = 1\r b = 2\r\n c = 3\n' f = ast.parse(s).body[0] self._check_content(s, f, s.rstrip()) def test_source_segment_missing_info(self): s = 'v = 1\r\nw = 1\nx = 1\n\ry = 1\r\n' v, w, x, y = ast.parse(s).body del v.lineno del w.end_lineno del x.col_offset del y.end_col_offset self.assertIsNone(ast.get_source_segment(s, v)) self.assertIsNone(ast.get_source_segment(s, w)) self.assertIsNone(ast.get_source_segment(s, x)) self.assertIsNone(ast.get_source_segment(s, y)) class NodeTransformerTests(ASTTestMixin, unittest.TestCase): def assertASTTransformation(self, tranformer_class, initial_code, expected_code): initial_ast = ast.parse(dedent(initial_code)) expected_ast = ast.parse(dedent(expected_code)) tranformer = tranformer_class() result_ast = ast.fix_missing_locations(tranformer.visit(initial_ast)) self.assertASTEqual(result_ast, expected_ast) def test_node_remove_single(self): code = 'def func(arg) -> SomeType: ...' expected = 'def func(arg): ...' # Since `FunctionDef.returns` is defined as a single value, we test # the `if isinstance(old_value, AST):` branch here. class SomeTypeRemover(ast.NodeTransformer): def visit_Name(self, node: ast.Name): self.generic_visit(node) if node.id == 'SomeType': return None return node self.assertASTTransformation(SomeTypeRemover, code, expected) def test_node_remove_from_list(self): code = """ def func(arg): print(arg) yield arg """ expected = """ def func(arg): print(arg) """ # Since `FunctionDef.body` is defined as a list, we test # the `if isinstance(old_value, list):` branch here. class YieldRemover(ast.NodeTransformer): def visit_Expr(self, node: ast.Expr): self.generic_visit(node) if isinstance(node.value, ast.Yield): return None # Remove `yield` from a function return node self.assertASTTransformation(YieldRemover, code, expected) def test_node_return_list(self): code = """ class DSL(Base, kw1=True): ... """ expected = """ class DSL(Base, kw1=True, kw2=True, kw3=False): ... """ class ExtendKeywords(ast.NodeTransformer): def visit_keyword(self, node: ast.keyword): self.generic_visit(node) if node.arg == 'kw1': return [ node, ast.keyword('kw2', ast.Constant(True)), ast.keyword('kw3', ast.Constant(False)), ] return node self.assertASTTransformation(ExtendKeywords, code, expected) def test_node_mutate(self): code = """ def func(arg): print(arg) """ expected = """ def func(arg): log(arg) """ class PrintToLog(ast.NodeTransformer): def visit_Call(self, node: ast.Call): self.generic_visit(node) if isinstance(node.func, ast.Name) and node.func.id == 'print': node.func.id = 'log' return node self.assertASTTransformation(PrintToLog, code, expected) def test_node_replace(self): code = """ def func(arg): print(arg) """ expected = """ def func(arg): logger.log(arg, debug=True) """ class PrintToLog(ast.NodeTransformer): def visit_Call(self, node: ast.Call): self.generic_visit(node) if isinstance(node.func, ast.Name) and node.func.id == 'print': return ast.Call( func=ast.Attribute( ast.Name('logger', ctx=ast.Load()), attr='log', ctx=ast.Load(), ), args=node.args, keywords=[ast.keyword('debug', ast.Constant(True))], ) return node self.assertASTTransformation(PrintToLog, code, expected) class ASTConstructorTests(unittest.TestCase): """Test the autogenerated constructors for AST nodes.""" def test_FunctionDef(self): args = ast.arguments() self.assertEqual(args.args, []) self.assertEqual(args.posonlyargs, []) with self.assertWarnsRegex(DeprecationWarning, r"FunctionDef\.__init__ missing 1 required positional argument: 'name'"): node = ast.FunctionDef(args=args) self.assertFalse(hasattr(node, "name")) self.assertEqual(node.decorator_list, []) node = ast.FunctionDef(name='foo', args=args) self.assertEqual(node.name, 'foo') self.assertEqual(node.decorator_list, []) def test_expr_context(self): name = ast.Name("x") self.assertEqual(name.id, "x") self.assertIsInstance(name.ctx, ast.Load) name2 = ast.Name("x", ast.Store()) self.assertEqual(name2.id, "x") self.assertIsInstance(name2.ctx, ast.Store) name3 = ast.Name("x", ctx=ast.Del()) self.assertEqual(name3.id, "x") self.assertIsInstance(name3.ctx, ast.Del) with self.assertWarnsRegex(DeprecationWarning, r"Name\.__init__ missing 1 required positional argument: 'id'"): name3 = ast.Name() def test_custom_subclass_with_no_fields(self): class NoInit(ast.AST): pass obj = NoInit() self.assertIsInstance(obj, NoInit) self.assertEqual(obj.__dict__, {}) def test_fields_but_no_field_types(self): class Fields(ast.AST): _fields = ('a',) obj = Fields() with self.assertRaises(AttributeError): obj.a obj = Fields(a=1) self.assertEqual(obj.a, 1) def test_fields_and_types(self): class FieldsAndTypes(ast.AST): _fields = ('a',) _field_types = {'a': int | None} a: int | None = None obj = FieldsAndTypes() self.assertIs(obj.a, None) obj = FieldsAndTypes(a=1) self.assertEqual(obj.a, 1) def test_custom_attributes(self): class MyAttrs(ast.AST): _attributes = ("a", "b") obj = MyAttrs(a=1, b=2) self.assertEqual(obj.a, 1) self.assertEqual(obj.b, 2) with self.assertWarnsRegex(DeprecationWarning, r"MyAttrs.__init__ got an unexpected keyword argument 'c'."): obj = MyAttrs(c=3) def test_fields_and_types_no_default(self): class FieldsAndTypesNoDefault(ast.AST): _fields = ('a',) _field_types = {'a': int} with self.assertWarnsRegex(DeprecationWarning, r"FieldsAndTypesNoDefault\.__init__ missing 1 required positional argument: 'a'\."): obj = FieldsAndTypesNoDefault() with self.assertRaises(AttributeError): obj.a obj = FieldsAndTypesNoDefault(a=1) self.assertEqual(obj.a, 1) def test_incomplete_field_types(self): class MoreFieldsThanTypes(ast.AST): _fields = ('a', 'b') _field_types = {'a': int | None} a: int | None = None b: int | None = None with self.assertWarnsRegex( DeprecationWarning, r"Field 'b' is missing from MoreFieldsThanTypes\._field_types" ): obj = MoreFieldsThanTypes() self.assertIs(obj.a, None) self.assertIs(obj.b, None) obj = MoreFieldsThanTypes(a=1, b=2) self.assertEqual(obj.a, 1) self.assertEqual(obj.b, 2) def test_complete_field_types(self): class _AllFieldTypes(ast.AST): _fields = ('a', 'b') _field_types = {'a': int | None, 'b': list[str]} # This must be set explicitly a: int | None = None # This will add an implicit empty list default b: list[str] obj = _AllFieldTypes() self.assertIs(obj.a, None) self.assertEqual(obj.b, []) @support.cpython_only class ModuleStateTests(unittest.TestCase): # bpo-41194, bpo-41261, bpo-41631: The _ast module uses a global state. def check_ast_module(self): # Check that the _ast module still works as expected code = 'x + 1' filename = '' mode = 'eval' # Create _ast.AST subclasses instances ast_tree = compile(code, filename, mode, flags=ast.PyCF_ONLY_AST) # Call PyAST_Check() code = compile(ast_tree, filename, mode) self.assertIsInstance(code, types.CodeType) def test_reload_module(self): # bpo-41194: Importing the _ast module twice must not crash. with support.swap_item(sys.modules, '_ast', None): del sys.modules['_ast'] import _ast as ast1 del sys.modules['_ast'] import _ast as ast2 self.check_ast_module() # Unloading the two _ast module instances must not crash. del ast1 del ast2 support.gc_collect() self.check_ast_module() def test_sys_modules(self): # bpo-41631: Test reproducing a Mercurial crash when PyAST_Check() # imported the _ast module internally. lazy_mod = object() def my_import(name, *args, **kw): sys.modules[name] = lazy_mod return lazy_mod with support.swap_item(sys.modules, '_ast', None): del sys.modules['_ast'] with support.swap_attr(builtins, '__import__', my_import): # Test that compile() does not import the _ast module self.check_ast_module() self.assertNotIn('_ast', sys.modules) # Sanity check of the test itself import _ast self.assertIs(_ast, lazy_mod) def test_subinterpreter(self): # bpo-41631: Importing and using the _ast module in a subinterpreter # must not crash. code = dedent(''' import _ast import ast import gc import sys import types # Create _ast.AST subclasses instances and call PyAST_Check() ast_tree = compile('x+1', '', 'eval', flags=ast.PyCF_ONLY_AST) code = compile(ast_tree, 'string', 'eval') if not isinstance(code, types.CodeType): raise AssertionError # Unloading the _ast module must not crash. del ast, _ast del sys.modules['ast'], sys.modules['_ast'] gc.collect() ''') res = support.run_in_subinterp(code) self.assertEqual(res, 0) class ASTMainTests(unittest.TestCase): # Tests `ast.main()` function. def test_cli_file_input(self): code = "print(1, 2, 3)" expected = ast.dump(ast.parse(code), indent=3) with os_helper.temp_dir() as tmp_dir: filename = os.path.join(tmp_dir, "test_module.py") with open(filename, 'w', encoding='utf-8') as f: f.write(code) res, _ = script_helper.run_python_until_end("-m", "ast", filename) self.assertEqual(res.err, b"") self.assertEqual(expected.splitlines(), res.out.decode("utf8").splitlines()) self.assertEqual(res.rc, 0) def main(): if __name__ != '__main__': return if sys.argv[1:] == ['-g']: for statements, kind in ((exec_tests, "exec"), (single_tests, "single"), (eval_tests, "eval")): print(kind+"_results = [") for statement in statements: tree = ast.parse(statement, "?", kind) print("%r," % (to_tuple(tree),)) print("]") print("main()") raise SystemExit unittest.main() #### EVERYTHING BELOW IS GENERATED BY python Lib/test/test_ast.py -g ##### exec_results = [ ('Module', [('Expr', (1, 0, 1, 18), ('Constant', (1, 0, 1, 18), 'module docstring', None))], []), ('Module', [('FunctionDef', (1, 0, 1, 13), 'f', ('arguments', [], [], None, [], [], None, []), [('Pass', (1, 9, 1, 13))], [], None, None, [])], []), ('Module', [('FunctionDef', (1, 0, 1, 29), 'f', ('arguments', [], [], None, [], [], None, []), [('Expr', (1, 9, 1, 29), ('Constant', (1, 9, 1, 29), 'function docstring', None))], [], None, None, [])], []), ('Module', [('FunctionDef', (1, 0, 1, 14), 'f', ('arguments', [], [('arg', (1, 6, 1, 7), 'a', None, None)], None, [], [], None, []), [('Pass', (1, 10, 1, 14))], [], None, None, [])], []), ('Module', [('FunctionDef', (1, 0, 1, 16), 'f', ('arguments', [], [('arg', (1, 6, 1, 7), 'a', None, None)], None, [], [], None, [('Constant', (1, 8, 1, 9), 0, None)]), [('Pass', (1, 12, 1, 16))], [], None, None, [])], []), ('Module', [('FunctionDef', (1, 0, 1, 18), 'f', ('arguments', [], [], ('arg', (1, 7, 1, 11), 'args', None, None), [], [], None, []), [('Pass', (1, 14, 1, 18))], [], None, None, [])], []), ('Module', [('FunctionDef', (1, 0, 1, 23), 'f', ('arguments', [], [], ('arg', (1, 7, 1, 16), 'args', ('Starred', (1, 13, 1, 16), ('Name', (1, 14, 1, 16), 'Ts', ('Load',)), ('Load',)), None), [], [], None, []), [('Pass', (1, 19, 1, 23))], [], None, None, [])], []), ('Module', [('FunctionDef', (1, 0, 1, 36), 'f', ('arguments', [], [], ('arg', (1, 7, 1, 29), 'args', ('Starred', (1, 13, 1, 29), ('Subscript', (1, 14, 1, 29), ('Name', (1, 14, 1, 19), 'tuple', ('Load',)), ('Tuple', (1, 20, 1, 28), [('Name', (1, 20, 1, 23), 'int', ('Load',)), ('Constant', (1, 25, 1, 28), Ellipsis, None)], ('Load',)), ('Load',)), ('Load',)), None), [], [], None, []), [('Pass', (1, 32, 1, 36))], [], None, None, [])], []), ('Module', [('FunctionDef', (1, 0, 1, 36), 'f', ('arguments', [], [], ('arg', (1, 7, 1, 29), 'args', ('Starred', (1, 13, 1, 29), ('Subscript', (1, 14, 1, 29), ('Name', (1, 14, 1, 19), 'tuple', ('Load',)), ('Tuple', (1, 20, 1, 28), [('Name', (1, 20, 1, 23), 'int', ('Load',)), ('Starred', (1, 25, 1, 28), ('Name', (1, 26, 1, 28), 'Ts', ('Load',)), ('Load',))], ('Load',)), ('Load',)), ('Load',)), None), [], [], None, []), [('Pass', (1, 32, 1, 36))], [], None, None, [])], []), ('Module', [('FunctionDef', (1, 0, 1, 21), 'f', ('arguments', [], [], None, [], [], ('arg', (1, 8, 1, 14), 'kwargs', None, None), []), [('Pass', (1, 17, 1, 21))], [], None, None, [])], []), ('Module', [('FunctionDef', (1, 0, 1, 71), 'f', ('arguments', [], [('arg', (1, 6, 1, 7), 'a', None, None), ('arg', (1, 9, 1, 10), 'b', None, None), ('arg', (1, 14, 1, 15), 'c', None, None), ('arg', (1, 22, 1, 23), 'd', None, None), ('arg', (1, 28, 1, 29), 'e', None, None)], ('arg', (1, 35, 1, 39), 'args', None, None), [('arg', (1, 41, 1, 42), 'f', None, None)], [('Constant', (1, 43, 1, 45), 42, None)], ('arg', (1, 49, 1, 55), 'kwargs', None, None), [('Constant', (1, 11, 1, 12), 1, None), ('Constant', (1, 16, 1, 20), None, None), ('List', (1, 24, 1, 26), [], ('Load',)), ('Dict', (1, 30, 1, 32), [], [])]), [('Expr', (1, 58, 1, 71), ('Constant', (1, 58, 1, 71), 'doc for f()', None))], [], None, None, [])], []), ('Module', [('FunctionDef', (1, 0, 1, 27), 'f', ('arguments', [], [], None, [], [], None, []), [('Pass', (1, 23, 1, 27))], [], ('Subscript', (1, 11, 1, 21), ('Name', (1, 11, 1, 16), 'tuple', ('Load',)), ('Tuple', (1, 17, 1, 20), [('Starred', (1, 17, 1, 20), ('Name', (1, 18, 1, 20), 'Ts', ('Load',)), ('Load',))], ('Load',)), ('Load',)), None, [])], []), ('Module', [('FunctionDef', (1, 0, 1, 32), 'f', ('arguments', [], [], None, [], [], None, []), [('Pass', (1, 28, 1, 32))], [], ('Subscript', (1, 11, 1, 26), ('Name', (1, 11, 1, 16), 'tuple', ('Load',)), ('Tuple', (1, 17, 1, 25), [('Name', (1, 17, 1, 20), 'int', ('Load',)), ('Starred', (1, 22, 1, 25), ('Name', (1, 23, 1, 25), 'Ts', ('Load',)), ('Load',))], ('Load',)), ('Load',)), None, [])], []), ('Module', [('FunctionDef', (1, 0, 1, 45), 'f', ('arguments', [], [], None, [], [], None, []), [('Pass', (1, 41, 1, 45))], [], ('Subscript', (1, 11, 1, 39), ('Name', (1, 11, 1, 16), 'tuple', ('Load',)), ('Tuple', (1, 17, 1, 38), [('Name', (1, 17, 1, 20), 'int', ('Load',)), ('Starred', (1, 22, 1, 38), ('Subscript', (1, 23, 1, 38), ('Name', (1, 23, 1, 28), 'tuple', ('Load',)), ('Tuple', (1, 29, 1, 37), [('Name', (1, 29, 1, 32), 'int', ('Load',)), ('Constant', (1, 34, 1, 37), Ellipsis, None)], ('Load',)), ('Load',)), ('Load',))], ('Load',)), ('Load',)), None, [])], []), ('Module', [('ClassDef', (1, 0, 1, 12), 'C', [], [], [('Pass', (1, 8, 1, 12))], [], [])], []), ('Module', [('ClassDef', (1, 0, 1, 32), 'C', [], [], [('Expr', (1, 9, 1, 32), ('Constant', (1, 9, 1, 32), 'docstring for class C', None))], [], [])], []), ('Module', [('ClassDef', (1, 0, 1, 21), 'C', [('Name', (1, 8, 1, 14), 'object', ('Load',))], [], [('Pass', (1, 17, 1, 21))], [], [])], []), ('Module', [('ClassDef', (1, 0, 1, 19), 'C', [('Name', (1, 8, 1, 9), 'A', ('Load',)), ('Name', (1, 11, 1, 12), 'B', ('Load',))], [], [('Pass', (1, 15, 1, 19))], [], [])], []), ('Module', [('FunctionDef', (1, 0, 1, 16), 'f', ('arguments', [], [], None, [], [], None, []), [('Return', (1, 8, 1, 16), ('Constant', (1, 15, 1, 16), 1, None))], [], None, None, [])], []), ('Module', [('FunctionDef', (1, 0, 1, 14), 'f', ('arguments', [], [], None, [], [], None, []), [('Return', (1, 8, 1, 14), None)], [], None, None, [])], []), ('Module', [('Delete', (1, 0, 1, 5), [('Name', (1, 4, 1, 5), 'v', ('Del',))])], []), ('Module', [('Assign', (1, 0, 1, 5), [('Name', (1, 0, 1, 1), 'v', ('Store',))], ('Constant', (1, 4, 1, 5), 1, None), None)], []), ('Module', 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3, 1, 4), 'a', ('Load',)), -1, None)])), ('Expression', ('JoinedStr', (1, 0, 1, 10), [('FormattedValue', (1, 2, 1, 9), ('Name', (1, 3, 1, 4), 'a', ('Load',)), -1, ('Constant', (1, 5, 1, 8), '.2f', None))])), ('Expression', ('JoinedStr', (1, 0, 1, 8), [('FormattedValue', (1, 2, 1, 7), ('Name', (1, 3, 1, 4), 'a', ('Load',)), 114, None)])), ('Expression', ('JoinedStr', (1, 0, 1, 11), [('Constant', (1, 2, 1, 6), 'foo(', None), ('FormattedValue', (1, 6, 1, 9), ('Name', (1, 7, 1, 8), 'a', ('Load',)), -1, None), ('Constant', (1, 9, 1, 10), ')', None)])), ] main()