# Copyright (c) 2015-2016 Claudiu Popa # Licensed under the LGPL: https://www.gnu.org/licenses/old-licenses/lgpl-2.1.en.html # For details: https://github.com/PyCQA/astroid/blob/master/COPYING.LESSER import contextlib import unittest import astroid from astroid import extract_node from astroid.test_utils import require_version from astroid import InferenceError from astroid import nodes from astroid import util from astroid.node_classes import AssignName, Const, Name, Starred @contextlib.contextmanager def _add_transform(manager, node, transform, predicate=None): manager.register_transform(node, transform, predicate) try: yield finally: manager.unregister_transform(node, transform, predicate) class ProtocolTests(unittest.TestCase): def assertConstNodesEqual(self, nodes_list_expected, nodes_list_got): self.assertEqual(len(nodes_list_expected), len(nodes_list_got)) for node in nodes_list_got: self.assertIsInstance(node, Const) for node, expected_value in zip(nodes_list_got, nodes_list_expected): self.assertEqual(expected_value, node.value) def assertNameNodesEqual(self, nodes_list_expected, nodes_list_got): self.assertEqual(len(nodes_list_expected), len(nodes_list_got)) for node in nodes_list_got: self.assertIsInstance(node, Name) for node, expected_name in zip(nodes_list_got, nodes_list_expected): self.assertEqual(expected_name, node.name) def test_assigned_stmts_simple_for(self): assign_stmts = extract_node(""" for a in (1, 2, 3): #@ pass for b in range(3): #@ pass """) for1_assnode = next(assign_stmts[0].nodes_of_class(AssignName)) assigned = list(for1_assnode.assigned_stmts()) self.assertConstNodesEqual([1, 2, 3], assigned) for2_assnode = next(assign_stmts[1].nodes_of_class(AssignName)) self.assertRaises(InferenceError, list, for2_assnode.assigned_stmts()) @require_version(minver='3.0') def test_assigned_stmts_starred_for(self): assign_stmts = extract_node(""" for *a, b in ((1, 2, 3), (4, 5, 6, 7)): #@ pass """) for1_starred = next(assign_stmts.nodes_of_class(Starred)) assigned = next(for1_starred.assigned_stmts()) self.assertEqual(assigned, util.Uninferable) def _get_starred_stmts(self, code): assign_stmt = extract_node("{} #@".format(code)) starred = next(assign_stmt.nodes_of_class(Starred)) return next(starred.assigned_stmts()) def _helper_starred_expected_const(self, code, expected): stmts = self._get_starred_stmts(code) self.assertIsInstance(stmts, nodes.List) stmts = stmts.elts self.assertConstNodesEqual(expected, stmts) def _helper_starred_expected(self, code, expected): stmts = self._get_starred_stmts(code) self.assertEqual(expected, stmts) def _helper_starred_inference_error(self, code): assign_stmt = extract_node("{} #@".format(code)) starred = next(assign_stmt.nodes_of_class(Starred)) self.assertRaises(InferenceError, list, starred.assigned_stmts()) @require_version(minver='3.0') def test_assigned_stmts_starred_assnames(self): self._helper_starred_expected_const( "a, *b = (1, 2, 3, 4) #@", [2, 3, 4]) self._helper_starred_expected_const( "*a, b = (1, 2, 3) #@", [1, 2]) self._helper_starred_expected_const( "a, *b, c = (1, 2, 3, 4, 5) #@", [2, 3, 4]) self._helper_starred_expected_const( "a, *b = (1, 2) #@", [2]) self._helper_starred_expected_const( "*b, a = (1, 2) #@", [1]) self._helper_starred_expected_const( "[*b] = (1, 2) #@", [1, 2]) @require_version(minver='3.0') def test_assigned_stmts_starred_yes(self): # Not something iterable and known self._helper_starred_expected("a, *b = range(3) #@", util.Uninferable) # Not something inferrable self._helper_starred_expected("a, *b = balou() #@", util.Uninferable) # In function, unknown. self._helper_starred_expected(""" def test(arg): head, *tail = arg #@""", util.Uninferable) # These cases aren't worth supporting. self._helper_starred_expected( "a, (*b, c), d = (1, (2, 3, 4), 5) #@", util.Uninferable) @require_version(minver='3.0') def test_assign_stmts_starred_fails(self): # Too many starred self._helper_starred_inference_error("a, *b, *c = (1, 2, 3) #@") # Too many lhs values self._helper_starred_inference_error("a, *b, c = (1, 2) #@") # This could be solved properly, but it complicates needlessly the # code for assigned_stmts, without offering real benefit. self._helper_starred_inference_error( "(*a, b), (c, *d) = (1, 2, 3), (4, 5, 6) #@") def test_assigned_stmts_assignments(self): assign_stmts = extract_node(""" c = a #@ d, e = b, c #@ """) simple_assnode = next(assign_stmts[0].nodes_of_class(AssignName)) assigned = list(simple_assnode.assigned_stmts()) self.assertNameNodesEqual(['a'], assigned) assnames = assign_stmts[1].nodes_of_class(AssignName) simple_mul_assnode_1 = next(assnames) assigned = list(simple_mul_assnode_1.assigned_stmts()) self.assertNameNodesEqual(['b'], assigned) simple_mul_assnode_2 = next(assnames) assigned = list(simple_mul_assnode_2.assigned_stmts()) self.assertNameNodesEqual(['c'], assigned) @require_version(minver='3.6') def test_assigned_stmts_annassignments(self): annassign_stmts = extract_node(""" a: str = "abc" #@ b: str #@ """) simple_annassign_node = next(annassign_stmts[0].nodes_of_class(AssignName)) assigned = list(simple_annassign_node.assigned_stmts()) self.assertEqual(1, len(assigned)) self.assertIsInstance(assigned[0], Const) self.assertEqual(assigned[0].value, "abc") empty_annassign_node = next(annassign_stmts[1].nodes_of_class(AssignName)) assigned = list(empty_annassign_node.assigned_stmts()) self.assertEqual(1, len(assigned)) self.assertIs(assigned[0], util.Uninferable) def test_sequence_assigned_stmts_not_accepting_empty_node(self): def transform(node): node.root().locals['__all__'] = [node.value] manager = astroid.MANAGER with _add_transform(manager, astroid.Assign, transform): module = astroid.parse(''' __all__ = ['a'] ''') module.wildcard_import_names() if __name__ == '__main__': unittest.main()