468 lines
14 KiB
Python
468 lines
14 KiB
Python
# coding=utf-8
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"""Tests for scope."""
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# Copyright 2017 Google LLC
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# https://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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import ast
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import textwrap
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import unittest
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from pasta.base import ast_utils
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from pasta.base import scope
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from pasta.base import test_utils
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class ScopeTest(test_utils.TestCase):
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def test_top_level_imports(self):
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self.maxDiff = None
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source = textwrap.dedent("""\
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import aaa
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import bbb, ccc.ddd
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import aaa.bbb.ccc
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from eee import fff
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from ggg.hhh import iii, jjj
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""")
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tree = ast.parse(source)
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nodes = tree.body
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node_1_aaa = nodes[0].names[0]
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node_2_bbb = nodes[1].names[0]
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node_2_ccc_ddd = nodes[1].names[1]
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node_3_aaa_bbb_ccc = nodes[2].names[0]
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node_4_eee = nodes[3]
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node_4_fff = nodes[3].names[0]
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node_5_ggg_hhh = nodes[4]
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node_5_iii = nodes[4].names[0]
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node_5_jjj = nodes[4].names[1]
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s = scope.analyze(tree)
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self.assertItemsEqual(
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s.names.keys(), {
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'aaa', 'bbb', 'ccc', 'fff', 'iii', 'jjj'
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})
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self.assertItemsEqual(
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s.external_references.keys(), {
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'aaa', 'bbb', 'ccc', 'ccc.ddd', 'aaa.bbb', 'aaa.bbb.ccc', 'eee',
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'eee.fff', 'ggg', 'ggg.hhh', 'ggg.hhh.iii', 'ggg.hhh.jjj'
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})
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self.assertItemsEqual(s.external_references['aaa'], [
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scope.ExternalReference('aaa', node_1_aaa, s.names['aaa']),
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scope.ExternalReference('aaa', node_3_aaa_bbb_ccc, s.names['aaa']),
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])
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self.assertItemsEqual(s.external_references['bbb'], [
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scope.ExternalReference('bbb', node_2_bbb, s.names['bbb']),
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])
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self.assertItemsEqual(s.external_references['ccc'], [
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scope.ExternalReference('ccc', node_2_ccc_ddd, s.names['ccc']),
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])
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self.assertItemsEqual(s.external_references['ccc.ddd'], [
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scope.ExternalReference('ccc.ddd', node_2_ccc_ddd,
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s.names['ccc'].attrs['ddd']),
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])
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self.assertItemsEqual(s.external_references['aaa.bbb'], [
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scope.ExternalReference('aaa.bbb', node_3_aaa_bbb_ccc,
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s.names['aaa'].attrs['bbb']),
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])
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self.assertItemsEqual(s.external_references['aaa.bbb.ccc'], [
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scope.ExternalReference('aaa.bbb.ccc', node_3_aaa_bbb_ccc,
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s.names['aaa'].attrs['bbb'].attrs['ccc']),
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])
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self.assertItemsEqual(s.external_references['eee'], [
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scope.ExternalReference('eee', node_4_eee, None),
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])
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self.assertItemsEqual(s.external_references['eee.fff'], [
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scope.ExternalReference('eee.fff', node_4_fff, s.names['fff']),
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])
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self.assertItemsEqual(s.external_references['ggg'], [
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scope.ExternalReference('ggg', node_5_ggg_hhh, None),
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])
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self.assertItemsEqual(s.external_references['ggg.hhh'], [
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scope.ExternalReference('ggg.hhh', node_5_ggg_hhh, None),
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])
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self.assertItemsEqual(s.external_references['ggg.hhh.iii'], [
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scope.ExternalReference('ggg.hhh.iii', node_5_iii, s.names['iii']),
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])
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self.assertItemsEqual(s.external_references['ggg.hhh.jjj'], [
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scope.ExternalReference('ggg.hhh.jjj', node_5_jjj, s.names['jjj']),
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])
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self.assertIs(s.names['aaa'].definition, node_1_aaa)
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self.assertIs(s.names['bbb'].definition, node_2_bbb)
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self.assertIs(s.names['ccc'].definition, node_2_ccc_ddd)
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self.assertIs(s.names['fff'].definition, node_4_fff)
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self.assertIs(s.names['iii'].definition, node_5_iii)
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self.assertIs(s.names['jjj'].definition, node_5_jjj)
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self.assertItemsEqual(s.names['aaa'].reads, [node_3_aaa_bbb_ccc])
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for ref in {'bbb', 'ccc', 'fff', 'iii', 'jjj'}:
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self.assertEqual(s.names[ref].reads, [], 'Expected no reads for %s' % ref)
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def test_if_nested_imports(self):
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source = textwrap.dedent("""\
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if a:
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import aaa
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elif b:
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import bbb
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else:
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import ccc
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""")
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tree = ast.parse(source)
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nodes = tree.body
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node_aaa, node_bbb, node_ccc = ast_utils.find_nodes_by_type(tree, ast.alias)
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s = scope.analyze(tree)
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self.assertItemsEqual(s.names.keys(), {'aaa', 'bbb', 'ccc', 'a', 'b'})
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self.assertItemsEqual(s.external_references.keys(), {'aaa', 'bbb', 'ccc'})
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self.assertEqual(s.names['aaa'].definition, node_aaa)
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self.assertEqual(s.names['bbb'].definition, node_bbb)
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self.assertEqual(s.names['ccc'].definition, node_ccc)
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self.assertIsNone(s.names['a'].definition)
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self.assertIsNone(s.names['b'].definition)
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for ref in {'aaa', 'bbb', 'ccc'}:
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self.assertEqual(s.names[ref].reads, [],
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'Expected no reads for %s' % ref)
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def test_try_nested_imports(self):
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source = textwrap.dedent("""\
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try:
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import aaa
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except:
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import bbb
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finally:
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import ccc
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""")
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tree = ast.parse(source)
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nodes = tree.body
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node_aaa, node_bbb, node_ccc = ast_utils.find_nodes_by_type(tree, ast.alias)
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s = scope.analyze(tree)
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self.assertItemsEqual(s.names.keys(), {'aaa', 'bbb', 'ccc'})
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self.assertItemsEqual(s.external_references.keys(), {'aaa', 'bbb', 'ccc'})
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self.assertEqual(s.names['aaa'].definition, node_aaa)
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self.assertEqual(s.names['bbb'].definition, node_bbb)
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self.assertEqual(s.names['ccc'].definition, node_ccc)
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for ref in {'aaa', 'bbb', 'ccc'}:
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self.assertEqual(s.names[ref].reads, [],
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'Expected no reads for %s' % ref)
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def test_functiondef_nested_imports(self):
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source = textwrap.dedent("""\
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def foo(bar):
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import aaa
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""")
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tree = ast.parse(source)
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nodes = tree.body
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node_aaa = ast_utils.find_nodes_by_type(tree, ast.alias)[0]
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s = scope.analyze(tree)
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self.assertItemsEqual(s.names.keys(), {'foo'})
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self.assertItemsEqual(s.external_references.keys(), {'aaa'})
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def test_classdef_nested_imports(self):
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source = textwrap.dedent("""\
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class Foo():
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import aaa
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""")
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tree = ast.parse(source)
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nodes = tree.body
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node_aaa = nodes[0].body[0].names[0]
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s = scope.analyze(tree)
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self.assertItemsEqual(s.names.keys(), {'Foo'})
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self.assertItemsEqual(s.external_references.keys(), {'aaa'})
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def test_multilevel_import_reads(self):
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source = textwrap.dedent("""\
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import aaa.bbb.ccc
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aaa.bbb.ccc.foo()
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""")
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tree = ast.parse(source)
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nodes = tree.body
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node_ref = nodes[1].value.func.value
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s = scope.analyze(tree)
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self.assertItemsEqual(s.names.keys(), {'aaa'})
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self.assertItemsEqual(s.external_references.keys(),
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{'aaa', 'aaa.bbb', 'aaa.bbb.ccc'})
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self.assertItemsEqual(s.names['aaa'].reads, [node_ref.value.value])
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self.assertItemsEqual(s.names['aaa'].attrs['bbb'].reads, [node_ref.value])
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self.assertItemsEqual(s.names['aaa'].attrs['bbb'].attrs['ccc'].reads,
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[node_ref])
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def test_import_reads_in_functiondef(self):
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source = textwrap.dedent("""\
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import aaa
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@aaa.x
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def foo(bar):
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return aaa
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""")
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tree = ast.parse(source)
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nodes = tree.body
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return_value = nodes[1].body[0].value
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decorator = nodes[1].decorator_list[0].value
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s = scope.analyze(tree)
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self.assertItemsEqual(s.names.keys(), {'aaa', 'foo'})
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self.assertItemsEqual(s.external_references.keys(), {'aaa'})
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self.assertItemsEqual(s.names['aaa'].reads, [decorator, return_value])
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def test_import_reads_in_classdef(self):
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source = textwrap.dedent("""\
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import aaa
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@aaa.x
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class Foo(aaa.Bar):
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pass
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""")
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tree = ast.parse(source)
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nodes = tree.body
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node_aaa = nodes[0].names[0]
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decorator = nodes[1].decorator_list[0].value
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base = nodes[1].bases[0].value
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s = scope.analyze(tree)
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self.assertItemsEqual(s.names.keys(), {'aaa', 'Foo'})
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self.assertItemsEqual(s.external_references.keys(), {'aaa'})
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self.assertItemsEqual(s.names['aaa'].reads, [decorator, base])
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def test_import_masked_by_function_arg(self):
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source = textwrap.dedent("""\
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import aaa
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def foo(aaa=aaa):
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return aaa
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""")
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tree = ast.parse(source)
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nodes = tree.body
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argval = nodes[1].args.defaults[0]
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s = scope.analyze(tree)
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self.assertItemsEqual(s.names.keys(), {'aaa', 'foo'})
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self.assertItemsEqual(s.external_references.keys(), {'aaa'})
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self.assertItemsEqual(s.names['aaa'].reads, [argval])
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def test_import_masked_by_assign(self):
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source = textwrap.dedent("""\
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import aaa
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def foo():
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aaa = 123
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return aaa
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aaa
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""")
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tree = ast.parse(source)
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nodes = tree.body
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node_aaa = nodes[2].value
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s = scope.analyze(tree)
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self.assertItemsEqual(s.names.keys(), {'aaa', 'foo'})
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self.assertItemsEqual(s.external_references.keys(), {'aaa'})
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self.assertItemsEqual(s.names['aaa'].reads, [node_aaa])
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def test_import_in_decortator(self):
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source = textwrap.dedent("""\
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import aaa
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@aaa.wrapper
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def foo(aaa=1):
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pass
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""")
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tree = ast.parse(source)
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nodes = tree.body
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decorator = nodes[1].decorator_list[0].value
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s = scope.analyze(tree)
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self.assertItemsEqual(s.names.keys(), {'aaa', 'foo'})
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self.assertItemsEqual(s.external_references.keys(), {'aaa'})
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self.assertItemsEqual(s.names['aaa'].reads, [decorator])
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@test_utils.requires_features('type_annotations')
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def test_import_in_return_type(self):
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source = textwrap.dedent("""\
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import aaa
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def foo() -> aaa.Foo:
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pass
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""")
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tree = ast.parse(source)
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nodes = tree.body
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func = nodes[1]
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s = scope.analyze(tree)
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self.assertItemsEqual(s.names.keys(), {'aaa', 'foo'})
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self.assertItemsEqual(s.external_references.keys(), {'aaa'})
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self.assertItemsEqual(s.names['aaa'].reads, [func.returns.value])
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@test_utils.requires_features('type_annotations')
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def test_import_in_argument_type(self):
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source = textwrap.dedent("""\
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import aaa
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def foo(bar: aaa.Bar):
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pass
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""")
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tree = ast.parse(source)
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nodes = tree.body
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func = nodes[1]
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s = scope.analyze(tree)
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self.assertItemsEqual(s.names.keys(), {'aaa', 'foo'})
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self.assertItemsEqual(s.external_references.keys(), {'aaa'})
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self.assertItemsEqual(s.names['aaa'].reads,
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[func.args.args[0].annotation.value])
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def test_import_attribute_references(self):
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source = textwrap.dedent("""\
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import aaa.bbb.ccc, ddd.eee
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aaa.x()
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aaa.bbb.y()
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aaa.bbb.ccc.z()
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""")
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tree = ast.parse(source)
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nodes = tree.body
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call1 = nodes[1].value.func.value
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call2 = nodes[2].value.func.value
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call3 = nodes[3].value.func.value
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s = scope.analyze(tree)
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self.assertItemsEqual(s.names.keys(), {'aaa', 'ddd'})
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self.assertItemsEqual(s.external_references.keys(),
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{'aaa', 'aaa.bbb', 'aaa.bbb.ccc', 'ddd', 'ddd.eee'})
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self.assertItemsEqual(s.names['aaa'].reads,
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[call1, call2.value, call3.value.value])
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self.assertItemsEqual(s.names['aaa'].attrs['bbb'].reads,
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[call2, call3.value])
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self.assertItemsEqual(s.names['aaa'].attrs['bbb'].attrs['ccc'].reads,
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[call3])
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def test_lookup_scope(self):
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src = textwrap.dedent("""\
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import a
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def b(c, d, e=1):
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class F(d):
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g = 1
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return c
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""")
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t = ast.parse(src)
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import_node, func_node = t.body
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class_node, return_node = func_node.body
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sc = scope.analyze(t)
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import_node_scope = sc.lookup_scope(import_node)
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self.assertIs(import_node_scope.node, t)
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self.assertIs(import_node_scope, sc)
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self.assertItemsEqual(import_node_scope.names, ['a', 'b'])
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func_node_scope = sc.lookup_scope(func_node)
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self.assertIs(func_node_scope.node, func_node)
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self.assertIs(func_node_scope.parent_scope, sc)
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self.assertItemsEqual(func_node_scope.names, ['c', 'd', 'e', 'F'])
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class_node_scope = sc.lookup_scope(class_node)
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self.assertIs(class_node_scope.node, class_node)
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self.assertIs(class_node_scope.parent_scope, func_node_scope)
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self.assertItemsEqual(class_node_scope.names, ['g'])
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return_node_scope = sc.lookup_scope(return_node)
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self.assertIs(return_node_scope.node, func_node)
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self.assertIs(return_node_scope, func_node_scope)
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self.assertItemsEqual(return_node_scope.names, ['c', 'd', 'e', 'F'])
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self.assertIs(class_node_scope.lookup_scope(func_node),
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func_node_scope)
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self.assertIsNone(sc.lookup_scope(ast.Name(id='foo')))
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def test_class_methods(self):
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source = textwrap.dedent("""\
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import aaa
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class C:
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def aaa(self):
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return aaa
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def bbb(self):
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return aaa
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""")
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tree = ast.parse(source)
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importstmt, classdef = tree.body
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method_aaa, method_bbb = classdef.body
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s = scope.analyze(tree)
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self.assertItemsEqual(s.names.keys(), {'aaa', 'C'})
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self.assertItemsEqual(s.external_references.keys(), {'aaa'})
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self.assertItemsEqual(s.names['aaa'].reads,
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[method_aaa.body[0].value, method_bbb.body[0].value])
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# TODO: Test references to C.aaa, C.bbb once supported
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def test_vararg_kwarg_references_in_function_body(self):
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source = textwrap.dedent("""\
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def aaa(bbb, *ccc, **ddd):
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ccc
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ddd
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eee(ccc, ddd)
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""")
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tree = ast.parse(source)
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funcdef, call = tree.body
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ccc_expr, ddd_expr = funcdef.body
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sc = scope.analyze(tree)
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func_scope = sc.lookup_scope(funcdef)
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self.assertIn('ccc', func_scope.names)
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self.assertItemsEqual(func_scope.names['ccc'].reads, [ccc_expr.value])
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self.assertIn('ddd', func_scope.names)
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self.assertItemsEqual(func_scope.names['ddd'].reads, [ddd_expr.value])
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def suite():
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result = unittest.TestSuite()
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result.addTests(unittest.makeSuite(ScopeTest))
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return result
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if __name__ == '__main__':
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unittest.main()
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