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123 lines
3.9 KiB
Python
123 lines
3.9 KiB
Python
"""Tests for the asdl parser in Parser/asdl.py"""
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import importlib.machinery
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import os
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from os.path import dirname
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import sys
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import sysconfig
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import unittest
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# This test is only relevant for from-source builds of Python.
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if not sysconfig.is_python_build():
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raise unittest.SkipTest('test irrelevant for an installed Python')
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src_base = dirname(dirname(dirname(__file__)))
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parser_dir = os.path.join(src_base, 'Parser')
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class TestAsdlParser(unittest.TestCase):
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@classmethod
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def setUpClass(cls):
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# Loads the asdl module dynamically, since it's not in a real importable
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# package.
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# Parses Python.asdl into an ast.Module and run the check on it.
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# There's no need to do this for each test method, hence setUpClass.
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sys.path.insert(0, parser_dir)
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loader = importlib.machinery.SourceFileLoader(
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'asdl', os.path.join(parser_dir, 'asdl.py'))
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cls.asdl = loader.load_module()
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cls.mod = cls.asdl.parse(os.path.join(parser_dir, 'Python.asdl'))
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cls.assertTrue(cls.asdl.check(cls.mod), 'Module validation failed')
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@classmethod
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def tearDownClass(cls):
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del sys.path[0]
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def setUp(self):
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# alias stuff from the class, for convenience
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self.asdl = TestAsdlParser.asdl
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self.mod = TestAsdlParser.mod
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self.types = self.mod.types
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def test_module(self):
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self.assertEqual(self.mod.name, 'Python')
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self.assertIn('stmt', self.types)
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self.assertIn('expr', self.types)
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self.assertIn('mod', self.types)
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def test_definitions(self):
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defs = self.mod.dfns
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self.assertIsInstance(defs[0], self.asdl.Type)
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self.assertIsInstance(defs[0].value, self.asdl.Sum)
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self.assertIsInstance(self.types['withitem'], self.asdl.Product)
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self.assertIsInstance(self.types['alias'], self.asdl.Product)
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def test_product(self):
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alias = self.types['alias']
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self.assertEqual(
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str(alias),
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'Product([Field(identifier, name), Field(identifier, asname, opt=True)])')
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def test_attributes(self):
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stmt = self.types['stmt']
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self.assertEqual(len(stmt.attributes), 2)
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self.assertEqual(str(stmt.attributes[0]), 'Field(int, lineno)')
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self.assertEqual(str(stmt.attributes[1]), 'Field(int, col_offset)')
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def test_constructor_fields(self):
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ehandler = self.types['excepthandler']
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self.assertEqual(len(ehandler.types), 1)
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self.assertEqual(len(ehandler.attributes), 2)
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cons = ehandler.types[0]
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self.assertIsInstance(cons, self.asdl.Constructor)
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self.assertEqual(len(cons.fields), 3)
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f0 = cons.fields[0]
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self.assertEqual(f0.type, 'expr')
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self.assertEqual(f0.name, 'type')
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self.assertTrue(f0.opt)
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f1 = cons.fields[1]
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self.assertEqual(f1.type, 'identifier')
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self.assertEqual(f1.name, 'name')
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self.assertTrue(f1.opt)
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f2 = cons.fields[2]
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self.assertEqual(f2.type, 'stmt')
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self.assertEqual(f2.name, 'body')
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self.assertFalse(f2.opt)
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self.assertTrue(f2.seq)
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def test_visitor(self):
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class CustomVisitor(self.asdl.VisitorBase):
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def __init__(self):
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super().__init__()
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self.names_with_seq = []
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def visitModule(self, mod):
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for dfn in mod.dfns:
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self.visit(dfn)
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def visitType(self, type):
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self.visit(type.value)
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def visitSum(self, sum):
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for t in sum.types:
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self.visit(t)
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def visitConstructor(self, cons):
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for f in cons.fields:
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if f.seq:
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self.names_with_seq.append(cons.name)
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v = CustomVisitor()
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v.visit(self.types['mod'])
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self.assertEqual(v.names_with_seq, ['Module', 'Interactive', 'Suite'])
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if __name__ == '__main__':
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unittest.main()
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