/Lib/test/test_ast.py
http://unladen-swallow.googlecode.com/ · Python · 339 lines · 255 code · 29 blank · 55 comment · 27 complexity · 3ec084dbfb8c45646f152c952a412b21 MD5 · raw file
- import sys, itertools, unittest
- from test import test_support
- import ast
- def to_tuple(t):
- if t is None or isinstance(t, (basestring, int, long, complex)):
- return t
- elif isinstance(t, list):
- return [to_tuple(e) for e in t]
- result = [t.__class__.__name__]
- if hasattr(t, 'lineno') and hasattr(t, 'col_offset'):
- result.append((t.lineno, t.col_offset))
- if t._fields is None:
- return tuple(result)
- for f in t._fields:
- result.append(to_tuple(getattr(t, f)))
- return tuple(result)
- # These tests are compiled through "exec"
- # There should be atleast one test per statement
- exec_tests = [
- # FunctionDef
- "def f(): pass",
- # ClassDef
- "class C:pass",
- # Return
- "def f():return 1",
- # Delete
- "del v",
- # Assign
- "v = 1",
- # AugAssign
- "v += 1",
- # Print
- "print >>f, 1, ",
- # For
- "for v in v:pass",
- # While
- "while v:pass",
- # If
- "if v:pass",
- # Raise
- "raise Exception, 'string'",
- # TryExcept
- "try:\n pass\nexcept Exception:\n pass",
- # TryFinally
- "try:\n pass\nfinally:\n pass",
- # Assert
- "assert v",
- # Import
- "import sys",
- # ImportFrom
- "from sys import v",
- # Exec
- "exec 'v'",
- # Global
- "global v",
- # Expr
- "1",
- # Pass,
- "pass",
- # Break
- "break",
- # Continue
- "continue",
- ]
- # 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 = [
- # BoolOp
- "a and b",
- # BinOp
- "a + b",
- # UnaryOp
- "not v",
- # Lambda
- "lambda:None",
- # Dict
- "{ 1:2 }",
- # ListComp
- "[a for b in c if d]",
- # GeneratorExp
- "(a for b in c if d)",
- # Yield - yield expressions can't work outside a function
- #
- # Compare
- "1 < 2 < 3",
- # Call
- "f(1,2,c=3,*d,**e)",
- # Repr
- "`v`",
- # Num
- "10L",
- # Str
- "'string'",
- # Attribute
- "a.b",
- # Subscript
- "a[b:c]",
- # Name
- "v",
- # List
- "[1,2,3]",
- # Tuple
- "1,2,3",
- # Combination
- "a.b.c.d(a.b[1:2])",
- ]
- # TODO: expr_context, slice, boolop, operator, unaryop, cmpop, comprehension
- # excepthandler, arguments, keywords, alias
- class AST_Tests(unittest.TestCase):
- def _assert_order(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.assert_(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):
- for child in value:
- self._assert_order(child, parent_pos)
- elif value is not None:
- self._assert_order(value, parent_pos)
- 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 itertools.izip(input, output):
- ast_tree = compile(i, "?", kind, ast.PyCF_ONLY_AST)
- self.assertEquals(to_tuple(ast_tree), o)
- self._assert_order(ast_tree, (0, 0))
- def test_nodeclasses(self):
- x = ast.BinOp(1, 2, 3, lineno=0)
- self.assertEquals(x.left, 1)
- self.assertEquals(x.op, 2)
- self.assertEquals(x.right, 3)
- self.assertEquals(x.lineno, 0)
- # node raises exception when not given enough arguments
- self.assertRaises(TypeError, ast.BinOp, 1, 2)
- # can set attributes through kwargs too
- x = ast.BinOp(left=1, op=2, right=3, lineno=0)
- self.assertEquals(x.left, 1)
- self.assertEquals(x.op, 2)
- self.assertEquals(x.right, 3)
- self.assertEquals(x.lineno, 0)
- # this used to fail because Sub._fields was None
- x = ast.Sub()
- def test_pickling(self):
- import pickle
- mods = [pickle]
- try:
- import cPickle
- mods.append(cPickle)
- except ImportError:
- pass
- protocols = [0, 1, 2]
- for mod in mods:
- for protocol in protocols:
- for ast in (compile(i, "?", "exec", 0x400) for i in exec_tests):
- ast2 = mod.loads(mod.dumps(ast, protocol))
- self.assertEquals(to_tuple(ast2), to_tuple(ast))
- class ASTHelpers_Test(unittest.TestCase):
- def test_parse(self):
- a = ast.parse('foo(1 + 1)')
- b = compile('foo(1 + 1)', '<unknown>', 'exec', ast.PyCF_ONLY_AST)
- self.assertEqual(ast.dump(a), ast.dump(b))
- def test_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()), Str(s='and cheese')], "
- "keywords=[], starargs=None, kwargs=None))])"
- )
- self.assertEqual(ast.dump(node, annotate_fields=False),
- "Module([Expr(Call(Name('spam', Load()), [Name('eggs', Load()), "
- "Str('and cheese')], [], None, None))])"
- )
- self.assertEqual(ast.dump(node, include_attributes=True),
- "Module(body=[Expr(value=Call(func=Name(id='spam', ctx=Load(), "
- "lineno=1, col_offset=0), args=[Name(id='eggs', ctx=Load(), "
- "lineno=1, col_offset=5), Str(s='and cheese', lineno=1, "
- "col_offset=11)], keywords=[], starargs=None, kwargs=None, "
- "lineno=1, col_offset=0), lineno=1, col_offset=0)])"
- )
- def test_copy_location(self):
- src = ast.parse('1 + 1', mode='eval')
- src.body.right = ast.copy_location(ast.Num(2), src.body.right)
- self.assertEqual(ast.dump(src, include_attributes=True),
- 'Expression(body=BinOp(left=Num(n=1, lineno=1, col_offset=0), '
- 'op=Add(), right=Num(n=2, lineno=1, col_offset=4), lineno=1, '
- 'col_offset=0))'
- )
- def test_fix_missing_locations(self):
- src = ast.parse('write("spam")')
- src.body.append(ast.Expr(ast.Call(ast.Name('spam', ast.Load()),
- [ast.Str('eggs')], [], None, None)))
- self.assertEqual(src, ast.fix_missing_locations(src))
- self.assertEqual(ast.dump(src, include_attributes=True),
- "Module(body=[Expr(value=Call(func=Name(id='write', ctx=Load(), "
- "lineno=1, col_offset=0), args=[Str(s='spam', lineno=1, "
- "col_offset=6)], keywords=[], starargs=None, kwargs=None, "
- "lineno=1, col_offset=0), lineno=1, col_offset=0), "
- "Expr(value=Call(func=Name(id='spam', ctx=Load(), lineno=1, "
- "col_offset=0), args=[Str(s='eggs', lineno=1, col_offset=0)], "
- "keywords=[], starargs=None, kwargs=None, lineno=1, "
- "col_offset=0), lineno=1, 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=Num(n=1, lineno=4, col_offset=0), '
- 'op=Add(), right=Num(n=1, lineno=4, col_offset=4), lineno=4, '
- 'col_offset=0))'
- )
- 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': [], 'kwargs': None,
- 'args': [], 'starargs': None})
- 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).n, 23)
- self.assertEqual(next(iterator).n, 42)
- self.assertEqual(ast.dump(next(iterator)),
- "keyword(arg='eggs', value=Str(s='leek'))"
- )
- def test_get_docstring(self):
- node = ast.parse('def foo():\n """line one\n line two"""')
- self.assertEqual(ast.get_docstring(node.body[0]),
- 'line one\nline two')
- 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.assertRaises(ValueError, ast.literal_eval, 'foo()')
- def test_main():
- test_support.run_unittest(AST_Tests, ASTHelpers_Test)
- 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 s in statements:
- print repr(to_tuple(compile(s, "?", kind, 0x400)))+","
- print "]"
- print "main()"
- raise SystemExit
- test_main()
- #### EVERYTHING BELOW IS GENERATED #####
- exec_results = [
- ('Module', [('FunctionDef', (1, 0), 'f', ('arguments', [], None, None, []), [('Pass', (1, 9))], [])]),
- ('Module', [('ClassDef', (1, 0), 'C', [], [('Pass', (1, 8))], [])]),
- ('Module', [('FunctionDef', (1, 0), 'f', ('arguments', [], None, None, []), [('Return', (1, 8), ('Num', (1, 15), 1))], [])]),
- ('Module', [('Delete', (1, 0), [('Name', (1, 4), 'v', ('Del',))])]),
- ('Module', [('Assign', (1, 0), [('Name', (1, 0), 'v', ('Store',))], ('Num', (1, 4), 1))]),
- ('Module', [('AugAssign', (1, 0), ('Name', (1, 0), 'v', ('Store',)), ('Add',), ('Num', (1, 5), 1))]),
- ('Module', [('Print', (1, 0), ('Name', (1, 8), 'f', ('Load',)), [('Num', (1, 11), 1)], False)]),
- ('Module', [('For', (1, 0), ('Name', (1, 4), 'v', ('Store',)), ('Name', (1, 9), 'v', ('Load',)), [('Pass', (1, 11))], [])]),
- ('Module', [('While', (1, 0), ('Name', (1, 6), 'v', ('Load',)), [('Pass', (1, 8))], [])]),
- ('Module', [('If', (1, 0), ('Name', (1, 3), 'v', ('Load',)), [('Pass', (1, 5))], [])]),
- ('Module', [('Raise', (1, 0), ('Name', (1, 6), 'Exception', ('Load',)), ('Str', (1, 17), 'string'), None)]),
- ('Module', [('TryExcept', (1, 0), [('Pass', (2, 2))], [('ExceptHandler', (3, 0), ('Name', (3, 7), 'Exception', ('Load',)), None, [('Pass', (4, 2))])], [])]),
- ('Module', [('TryFinally', (1, 0), [('Pass', (2, 2))], [('Pass', (4, 2))])]),
- ('Module', [('Assert', (1, 0), ('Name', (1, 7), 'v', ('Load',)), None)]),
- ('Module', [('Import', (1, 0), [('alias', 'sys', None)])]),
- ('Module', [('ImportFrom', (1, 0), 'sys', [('alias', 'v', None)], 0)]),
- ('Module', [('Exec', (1, 0), ('Str', (1, 5), 'v'), None, None)]),
- ('Module', [('Global', (1, 0), ['v'])]),
- ('Module', [('Expr', (1, 0), ('Num', (1, 0), 1))]),
- ('Module', [('Pass', (1, 0))]),
- ('Module', [('Break', (1, 0))]),
- ('Module', [('Continue', (1, 0))]),
- ]
- single_results = [
- ('Interactive', [('Expr', (1, 0), ('BinOp', (1, 0), ('Num', (1, 0), 1), ('Add',), ('Num', (1, 2), 2)))]),
- ]
- eval_results = [
- ('Expression', ('BoolOp', (1, 0), ('And',), [('Name', (1, 0), 'a', ('Load',)), ('Name', (1, 6), 'b', ('Load',))])),
- ('Expression', ('BinOp', (1, 0), ('Name', (1, 0), 'a', ('Load',)), ('Add',), ('Name', (1, 4), 'b', ('Load',)))),
- ('Expression', ('UnaryOp', (1, 0), ('Not',), ('Name', (1, 4), 'v', ('Load',)))),
- ('Expression', ('Lambda', (1, 0), ('arguments', [], None, None, []), ('Name', (1, 7), 'None', ('Load',)))),
- ('Expression', ('Dict', (1, 0), [('Num', (1, 2), 1)], [('Num', (1, 4), 2)])),
- ('Expression', ('ListComp', (1, 1), ('Name', (1, 1), 'a', ('Load',)), [('comprehension', ('Name', (1, 7), 'b', ('Store',)), ('Name', (1, 12), 'c', ('Load',)), [('Name', (1, 17), 'd', ('Load',))])])),
- ('Expression', ('GeneratorExp', (1, 1), ('Name', (1, 1), 'a', ('Load',)), [('comprehension', ('Name', (1, 7), 'b', ('Store',)), ('Name', (1, 12), 'c', ('Load',)), [('Name', (1, 17), 'd', ('Load',))])])),
- ('Expression', ('Compare', (1, 0), ('Num', (1, 0), 1), [('Lt',), ('Lt',)], [('Num', (1, 4), 2), ('Num', (1, 8), 3)])),
- ('Expression', ('Call', (1, 0), ('Name', (1, 0), 'f', ('Load',)), [('Num', (1, 2), 1), ('Num', (1, 4), 2)], [('keyword', 'c', ('Num', (1, 8), 3))], ('Name', (1, 11), 'd', ('Load',)), ('Name', (1, 15), 'e', ('Load',)))),
- ('Expression', ('Repr', (1, 0), ('Name', (1, 1), 'v', ('Load',)))),
- ('Expression', ('Num', (1, 0), 10L)),
- ('Expression', ('Str', (1, 0), 'string')),
- ('Expression', ('Attribute', (1, 0), ('Name', (1, 0), 'a', ('Load',)), 'b', ('Load',))),
- ('Expression', ('Subscript', (1, 0), ('Name', (1, 0), 'a', ('Load',)), ('Slice', ('Name', (1, 2), 'b', ('Load',)), ('Name', (1, 4), 'c', ('Load',)), None), ('Load',))),
- ('Expression', ('Name', (1, 0), 'v', ('Load',))),
- ('Expression', ('List', (1, 0), [('Num', (1, 1), 1), ('Num', (1, 3), 2), ('Num', (1, 5), 3)], ('Load',))),
- ('Expression', ('Tuple', (1, 0), [('Num', (1, 0), 1), ('Num', (1, 2), 2), ('Num', (1, 4), 3)], ('Load',))),
- ('Expression', ('Call', (1, 0), ('Attribute', (1, 0), ('Attribute', (1, 0), ('Attribute', (1, 0), ('Name', (1, 0), 'a', ('Load',)), 'b', ('Load',)), 'c', ('Load',)), 'd', ('Load',)), [('Subscript', (1, 8), ('Attribute', (1, 8), ('Name', (1, 8), 'a', ('Load',)), 'b', ('Load',)), ('Slice', ('Num', (1, 12), 1), ('Num', (1, 14), 2), None), ('Load',))], [], None, None)),
- ]
- main()