test_ast.py

#!/usr/bin/env python
#
# Copyright 2008 Neal Norwitz
# Portions Copyright 2008 Google Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#      http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""AST test."""

from __future__ import absolute_import

import unittest

from cpp import ast
from cpp import tokenize


__author__ = 'nnorwitz@google.com (Neal Norwitz)'


def _install_generic_equal(cls, attrs):
    """Add an __eq__ method to |cls| so objects can be compared for tests.

    Args:
      cls: Python class to add __eq__ method to
      attrs: string - space separated of attribute names to compare

    """
    attrs = attrs.split()

    def __eq__(self, other):
        if not isinstance(other, cls):
            return False
        for a in attrs:
            # Use not (a == other) since this could be recursive and
            # we don't define a not equals method.
            if not (getattr(self, a) == getattr(other, a)):
                return False
        return True
    cls.__eq__ = __eq__


def _install_equal_methods():
    """Install __eq__ methods on the appropriate objects used for testing."""
    _install_generic_equal(tokenize.Token, 'name')
    _install_generic_equal(ast.Class,
                           'name bases templated_types namespace body')
    _install_generic_equal(ast.Struct,
                           'name bases templated_types namespace body')
    _install_generic_equal(ast.Type, ('name templated_types modifiers '
                                      'reference pointer array'))
    _install_generic_equal(ast.Parameter, 'name type default')
    _install_generic_equal(ast.Function, ('name return_type parameters '
                                          'specializations modifiers '
                                          'templated_types body namespace'))
    _install_generic_equal(ast.Method, ('name in_class return_type parameters '
                                        'specializations modifiers '
                                        'templated_types body namespace'))
    _install_generic_equal(ast.Define, 'name definition')
    _install_generic_equal(ast.Include, 'filename system')
    _install_generic_equal(ast.Typedef, 'name alias namespace')
    _install_generic_equal(ast.VariableDeclaration,
                           'name type initial_value namespace')
_install_equal_methods()


def get_tokens(code_string):
    return tokenize.get_tokens(code_string + '\n')


def MakeBuilder(code_string):
    """Convenience function to make an ASTBuilder from a code snippet.."""
    return ast.ASTBuilder(get_tokens(code_string), '<test>')


def Token(name, start=0, end=0, token_type=tokenize.NAME):
    return tokenize.Token(token_type, name, start, end)


def Define(name, definition, start=0, end=0):
    return ast.Define(start, end, name, definition)


def Include(filename, system=False, start=0, end=0):
    return ast.Include(start, end, filename, system)


def Class(name, start=0, end=0, bases=None, body=None, templated_types=None,
          namespace=None):
    if namespace is None:
        namespace = []

    return ast.Class(start, end, name, bases, templated_types, body, namespace)


def Struct(name, start=0, end=0, bases=None, body=None, templated_types=None,
           namespace=None):
    if namespace is None:
        namespace = []

    return ast.Struct(start, end, name, bases, templated_types, body,
                      namespace)


def Type(name, start=0, end=0, templated_types=None, modifiers=None,
         reference=False, pointer=False, array=False):
    if templated_types is None:
        templated_types = []

    if modifiers is None:
        modifiers = []

    return ast.Type(start, end, name, templated_types, modifiers,
                    reference, pointer, array)


def Function(name, return_type, parameters, start=0, end=0,
             specializations=None, modifiers=0, templated_types=None,
             body=None, namespace=None):
    if specializations is None:
        specializations = []
    if namespace is None:
        namespace = []

    return ast.Function(start, end, name, return_type, parameters,
                        specializations, modifiers, templated_types,
                        body, namespace)


def Method(name, in_class, return_type, parameters, start=0, end=0,
           specializations=None, modifiers=0, templated_types=None,
           body=None, namespace=None):
    if specializations is None:
        specializations = []
    if namespace is None:
        namespace = []

    return ast.Method(start, end, name, in_class, return_type, parameters,
                      specializations, modifiers, templated_types,
                      body, namespace)


def Typedef(name, start=0, end=0, alias=None, namespace=None):
    if namespace is None:
        namespace = []

    return ast.Typedef(start, end, name, alias, namespace)


def VariableDeclaration(name, var_type, start=0, end=0, initial_value='',
                        namespace=None):
    if namespace is None:
        namespace = []

    return ast.VariableDeclaration(start, end, name, var_type, initial_value,
                                   namespace)


class CoverageTest(unittest.TestCase):

    def test_coverage(self):
        self.assertFalse(Type('Foo') == Type('Bar'))
        self.assertFalse(Type('Foo') == Typedef('Foo'))


class TypeConverterDeclarationToPartsTest(unittest.TestCase):

    def setUp(self):
        self.converter = ast.TypeConverter([])

    def test_simple(self):
        tokens = get_tokens('Fool data')
        name, type_name, templated_types, modifiers, _, __ = \
            self.converter.declaration_to_parts(list(tokens), True)
        self.assertEqual('data', name)
        self.assertEqual('Fool', type_name)
        self.assertEqual([], templated_types)
        self.assertEqual([], modifiers)

    def test_simple_modifiers(self):
        tokens = get_tokens('const volatile Fool data')
        name, type_name, templated_types, modifiers, _, __ = \
            self.converter.declaration_to_parts(list(tokens), True)
        self.assertEqual('data', name)
        self.assertEqual('Fool', type_name)
        self.assertEqual([], templated_types)
        self.assertEqual(['const', 'volatile'], modifiers)

    def test_simple_array(self):
        tokens = get_tokens('Fool[] data')
        name, type_name, templated_types, modifiers, _, __ = \
            self.converter.declaration_to_parts(list(tokens), True)
        self.assertEqual('data', name)
        self.assertEqual('Fool', type_name)
        self.assertEqual([], templated_types)
        self.assertEqual([], modifiers)

    def test_simple_template(self):
        tokens = get_tokens('Fool<tt> data')
        name, type_name, templated_types, modifiers, _, __ = \
            self.converter.declaration_to_parts(list(tokens), True)
        self.assertEqual('data', name)
        self.assertEqual('Fool', type_name)
        self.assertEqual([Type('tt')], templated_types)
        self.assertEqual([], modifiers)


class TypeConverterToParametersTest(unittest.TestCase):

    def setUp(self):
        self.converter = ast.TypeConverter([])

    def test_really_simple(self):
        tokens = get_tokens('int bar')
        results = self.converter.to_parameters(list(tokens))
        self.assertEqual(1, len(results), repr(results))

        self.assertEqual([], results[0].type.modifiers)
        self.assertEqual('int', results[0].type.name)
        self.assertEqual([], results[0].type.templated_types)
        self.assertEqual(False, results[0].type.pointer)
        self.assertEqual(False, results[0].type.reference)
        self.assertEqual(False, results[0].type.array)
        self.assertEqual('bar', results[0].name)

    def test_array(self):
        tokens = get_tokens('int[] bar')
        results = self.converter.to_parameters(list(tokens))
        self.assertEqual(1, len(results), repr(results))

        self.assertEqual([], results[0].type.modifiers)
        self.assertEqual('int', results[0].type.name)
        self.assertEqual([], results[0].type.templated_types)
        self.assertEqual(True, results[0].type.pointer)
        self.assertEqual(False, results[0].type.reference)
        self.assertEqual(False, results[0].type.array)
        self.assertEqual('bar', results[0].name)

    def test_array_pointer_reference(self):
        params = 'const int[] bar, mutable char* foo, volatile Bar& babar'
        tokens = get_tokens(params)
        results = self.converter.to_parameters(list(tokens))
        self.assertEqual(3, len(results), repr(results))

        self.assertEqual(['const'], results[0].type.modifiers)
        self.assertEqual('int', results[0].type.name)
        self.assertEqual([], results[0].type.templated_types)
        self.assertEqual(True, results[0].type.pointer)
        self.assertEqual(False, results[0].type.reference)
        self.assertEqual(False, results[0].type.array)
        self.assertEqual('bar', results[0].name)

        self.assertEqual(['mutable'], results[1].type.modifiers)
        self.assertEqual('char', results[1].type.name)
        self.assertEqual([], results[1].type.templated_types)
        self.assertEqual(True, results[1].type.pointer)
        self.assertEqual(False, results[1].type.reference)
        self.assertEqual(False, results[1].type.array)
        self.assertEqual('foo', results[1].name)

        self.assertEqual(['volatile'], results[2].type.modifiers)
        self.assertEqual('Bar', results[2].type.name)
        self.assertEqual([], results[2].type.templated_types)
        self.assertEqual(False, results[2].type.pointer)
        self.assertEqual(True, results[2].type.reference)
        self.assertEqual(False, results[2].type.array)
        self.assertEqual('babar', results[2].name)

    def test_array_with_class(self):
        tokens = get_tokens('Bar[] bar')
        results = self.converter.to_parameters(list(tokens))
        self.assertEqual(1, len(results), repr(results))

        self.assertEqual([], results[0].type.modifiers)
        self.assertEqual('Bar', results[0].type.name)
        self.assertEqual([], results[0].type.templated_types)
        self.assertEqual(True, results[0].type.pointer)
        self.assertEqual(False, results[0].type.reference)
        self.assertEqual(False, results[0].type.array)
        self.assertEqual('bar', results[0].name)

    def test_multiple_args(self):
        tokens = get_tokens('const volatile Fool* data, int bar, enum X foo')
        results = self.converter.to_parameters(list(tokens))
        self.assertEqual(3, len(results), repr(results))

        self.assertEqual(['const', 'volatile'], results[0].type.modifiers)
        self.assertEqual('Fool', results[0].type.name)
        self.assertEqual([], results[0].type.templated_types)
        self.assertEqual(True, results[0].type.pointer)
        self.assertEqual(False, results[0].type.reference)
        self.assertEqual('data', results[0].name)

        self.assertEqual([], results[1].type.modifiers)
        self.assertEqual('int', results[1].type.name)
        self.assertEqual([], results[1].type.templated_types)
        self.assertEqual(False, results[1].type.pointer)
        self.assertEqual(False, results[1].type.reference)
        self.assertEqual('bar', results[1].name)

        self.assertEqual(['enum'], results[2].type.modifiers)
        self.assertEqual('X', results[2].type.name)
        self.assertEqual([], results[2].type.templated_types)
        self.assertEqual(False, results[2].type.pointer)
        self.assertEqual(False, results[2].type.reference)
        self.assertEqual('foo', results[2].name)

    def test_simple_template_begin(self):
        tokens = get_tokens('pair<int, int> data, int bar')
        results = self.converter.to_parameters(list(tokens))
        self.assertEqual(2, len(results), repr(results))

        self.assertEqual([], results[0].type.modifiers)
        self.assertEqual('pair', results[0].type.name)
        self.assertEqual([Type('int'), Type('int')],
                         results[0].type.templated_types)
        self.assertEqual(False, results[0].type.pointer)
        self.assertEqual(False, results[0].type.reference)
        self.assertEqual('data', results[0].name)

        self.assertEqual([], results[1].type.modifiers)
        self.assertEqual('int', results[1].type.name)
        self.assertEqual([], results[1].type.templated_types)
        self.assertEqual(False, results[1].type.pointer)
        self.assertEqual(False, results[1].type.reference)
        self.assertEqual('bar', results[1].name)

    def test_nested_template(self):
        tokens = get_tokens('vector<pair<int, float>> data')
        results = self.converter.to_parameters(list(tokens))
        self.assertEqual(1, len(results), repr(results))

        self.assertEqual([], results[0].type.modifiers)
        self.assertEqual('vector', results[0].type.name)
        self.assertEqual('data', results[0].name)

        results = results[0].type.templated_types
        self.assertEqual(1, len(results), repr(results))
        self.assertEqual('pair', results[0].name)

        results = results[0].templated_types
        self.assertEqual(2, len(results), repr(results))
        self.assertEqual('int', results[0].name)
        self.assertEqual('float', results[1].name)

    def test_simple_with_initializers(self):
        tokens = get_tokens('Fool* data = NULL')
        results = self.converter.to_parameters(list(tokens))
        self.assertEqual(1, len(results), repr(results))

        self.assertEqual([], results[0].type.modifiers)
        self.assertEqual('Fool', results[0].type.name)
        self.assertEqual([], results[0].type.templated_types)
        self.assertEqual(True, results[0].type.pointer)
        self.assertEqual(False, results[0].type.reference)
        self.assertEqual(False, results[0].type.array)
        self.assertEqual('data', results[0].name)
        self.assertEqual([Token('NULL')], results[0].default)

    def test_templated_default_value(self):
        tokens = get_tokens('int i = Handle<Value>()')
        results = self.converter.to_parameters(list(tokens))
        self.assertEqual(1, len(results), repr(results))

        self.assertEqual([], results[0].type.modifiers)
        self.assertEqual('int', results[0].type.name)
        self.assertEqual([], results[0].type.templated_types)
        self.assertEqual(False, results[0].type.pointer)
        self.assertEqual(False, results[0].type.reference)
        self.assertEqual(False, results[0].type.array)
        self.assertEqual('i', results[0].name)

    def test_complex_default_value(self):
        tokens = get_tokens('int i = 4 * 2)')
        results = self.converter.to_parameters(list(tokens))
        self.assertEqual(1, len(results), repr(results))

        self.assertEqual([], results[0].type.modifiers)
        self.assertEqual('int', results[0].type.name)
        self.assertEqual([], results[0].type.templated_types)
        self.assertEqual(False, results[0].type.pointer)
        self.assertEqual(False, results[0].type.reference)
        self.assertEqual(False, results[0].type.array)
        self.assertEqual('i', results[0].name)


class TypeConverterToTypeTest(unittest.TestCase):

    def setUp(self):
        self.converter = ast.TypeConverter([])

    def test_simple(self):
        tokens = get_tokens('Bar')
        result = self.converter.to_type(list(tokens))
        self.assertEqual(1, len(result))
        self.assertEqual(Type('Bar'), result[0])

    def test_template(self):
        tokens = get_tokens('Bar<Foo>')
        result = self.converter.to_type(list(tokens))
        self.assertEqual(1, len(result))
        self.assertEqual(Type('Bar', templated_types=[Type('Foo')]),
                         result[0])

    def test_templated_type(self):
        tokens = get_tokens('Registry<T>::listener')
        result = self.converter.to_type(list(tokens))
        self.assertEqual(1, len(result))
        types = [Type('T')]
        self.assertEqual(Type('Registry::listener', templated_types=types),
                         result[0])

    def test_template_with_multiple_args(self):
        tokens = get_tokens('Bar<Foo, Blah, Bling>')
        result = self.converter.to_type(list(tokens))
        self.assertEqual(1, len(result))
        types = [Type('Foo'), Type('Blah'), Type('Bling')]
        self.assertEqual(Type('Bar', templated_types=types), result[0])

    def test_template_with_multiple_template_args_start(self):
        tokens = get_tokens('Bar<Foo<x>, Blah, Bling>')
        result = self.converter.to_type(list(tokens))
        self.assertEqual(1, len(result))
        types = [Type('Foo', templated_types=[Type('x')]),
                 Type('Blah'),
                 Type('Bling')]
        self.assertEqual(types[0], result[0].templated_types[0])
        self.assertEqual(types[1], result[0].templated_types[1])
        self.assertEqual(types[2], result[0].templated_types[2])
        self.assertEqual(Type('Bar', templated_types=types), result[0])

    def test_template_with_multiple_template_args_mid(self):
        tokens = get_tokens('Bar<Foo, Blah<x>, Bling>')
        result = self.converter.to_type(list(tokens))
        self.assertEqual(1, len(result))
        types = [Type('Foo'),
                 Type('Blah', templated_types=[Type('x')]),
                 Type('Bling')]
        self.assertEqual(Type('Bar', templated_types=types), result[0])

    def test_template_with_multiple_template_args_end(self):
        tokens = get_tokens('Bar<Foo, Blah, Bling<x> >')
        result = self.converter.to_type(list(tokens))
        self.assertEqual(1, len(result))
        types = [Type('Foo'),
                 Type('Blah'),
                 Type('Bling', templated_types=[Type('x')])]
        self.assertEqual(Type('Bar', templated_types=types), result[0])

    def test_template_with_multiple_template_args_reference(self):
        tokens = get_tokens('Foo<Bar<int>&, int>')
        result = self.converter.to_type(list(tokens))
        self.assertEqual(1, len(result))
        types = [Type('Bar', reference=True, templated_types=[Type('int')]),
                 Type('int')]
        self.assertEqual(Type('Foo', templated_types=types), result[0])

    def test_template_with_multiple_template_args_pointer(self):
        tokens = get_tokens('Foo<Bar<int>*, int>')
        result = self.converter.to_type(list(tokens))
        self.assertEqual(1, len(result))
        types = [Type('Bar', pointer=True, templated_types=[Type('int')]),
                 Type('int')]
        self.assertEqual(Type('Foo', templated_types=types), result[0])

    def test_template_with_function_arg_zero_arg(self):
        tokens = get_tokens('function<void ()>')
        result = self.converter.to_type(list(tokens))
        self.assertEqual(1, len(result))
        types = [Type('void')]
        self.assertEqual(Type('function', templated_types=types), result[0])

    def test_template_with_function_arg_one_arg(self):
        tokens = get_tokens('function<void (int)>')
        result = self.converter.to_type(list(tokens))
        self.assertEqual(1, len(result))
        types = [Type('void'),
                 Type('int')]
        self.assertEqual(Type('function', templated_types=types), result[0])

    def test_template_with_function_arg_two_args(self):
        tokens = get_tokens('function<void (int, int)>')
        result = self.converter.to_type(list(tokens))
        self.assertEqual(1, len(result))
        types = [Type('void'),
                 Type('int'),
                 Type('int')]
        self.assertEqual(Type('function', templated_types=types), result[0])

    def test_template_with_function_arg_and_nested_template(self):
        tokens = get_tokens('function<void(vector<int>&, int)>')
        result = self.converter.to_type(list(tokens))
        self.assertEqual(1, len(result))
        types = [Type('void'),
                 Type('vector', reference=True, templated_types=[Type('int')]),
                 Type('int')]
        self.assertEqual(Type('function', templated_types=types), result[0])

    def test_array(self):
        tokens = get_tokens('Foo[]')
        result = self.converter.to_type(list(tokens))
        self.assertEqual(1, len(result))
        self.assertEqual(Type('Foo', pointer=True), result[0])

    def test_array_with_size(self):
        tokens = get_tokens('Foo[42]')
        result = self.converter.to_type(list(tokens))
        self.assertEqual(1, len(result))
        self.assertEqual(Type('Foo', array=True), result[0])


class TypeConverterCreateReturnTypeTest(unittest.TestCase):

    def setUp(self):
        self.converter = ast.TypeConverter([])

    def test_empty(self):
        self.assertEqual(None, self.converter.create_return_type(None))
        self.assertEqual(None, self.converter.create_return_type([]))

    def test_simple(self):
        tokens = get_tokens('Bar')
        result = self.converter.create_return_type(list(tokens))
        self.assertEqual(Type('Bar'), result)

    def test_array(self):
        tokens = get_tokens('Bar[]')
        result = self.converter.create_return_type(list(tokens))
        self.assertEqual(Type('Bar', array=True), result)

    def test_const_pointer(self):
        tokens = get_tokens('const Bar*')
        result = self.converter.create_return_type(list(tokens))
        self.assertEqual(Type('Bar', modifiers=['const'], pointer=True),
                         result)

    def test_const_class_pointer(self):
        tokens = get_tokens('const class Bar*')
        result = self.converter.create_return_type(list(tokens))
        modifiers = ['const', 'class']
        self.assertEqual(Type('Bar', modifiers=modifiers, pointer=True),
                         result)

    def test_template(self):
        tokens = get_tokens('const pair<int, NS::Foo>*')
        result = self.converter.create_return_type(list(tokens))
        templated_types = [Type('int'), Type('NS::Foo')]
        self.assertEqual(Type('pair', modifiers=['const'],
                              templated_types=templated_types, pointer=True),
                         result)


class ASTBuilderGetTemplatedTypesTest(unittest.TestCase):

    def test_simple(self):
        builder = MakeBuilder('T> class')
        result = builder._get_templated_types()
        self.assertEqual(1, len(result))
        self.assertEqual((None, None), result['T'])

    def test_multiple(self):
        builder = MakeBuilder('T, U> class')
        result = builder._get_templated_types()
        self.assertEqual(2, len(result))
        self.assertEqual((None, None), result['T'])
        self.assertEqual((None, None), result['U'])

    def test_multiple_with_typename(self):
        builder = MakeBuilder('typename T, typename U> class')
        result = builder._get_templated_types()
        self.assertEqual(2, len(result))
        self.assertEqual((None, None), result['T'])
        self.assertEqual((None, None), result['U'])

    def test_multiple_with_typename_and_defaults(self):
        builder = MakeBuilder('typename T=XX, typename U=YY> class')
        result = builder._get_templated_types()
        self.assertEqual(2, len(result))
        self.assertEqual(None, result['T'][0])
        self.assertEqual(1, len(result['T'][1]))
        self.assertEqual('XX', result['T'][1][0].name)
        self.assertEqual(None, result['U'][0])
        self.assertEqual(1, len(result['U'][1]))
        self.assertEqual('YY', result['U'][1][0].name)

    def test_multiple_with_user_defined_type_name(self):
        builder = MakeBuilder('class C, Type t> class')
        result = builder._get_templated_types()
        self.assertEqual(2, len(result))
        self.assertEqual((None, None), result['C'])
        self.assertEqual('Type', result['t'][0].name)


class ASTBuilderIntegrationTest(unittest.TestCase):

    """Unlike the other test cases in this file, this test case is meant to be
    an integration test.

    It doesn't test any individual method. It tests whole code blocks.

    """

    def test_variable_array(self):
        nodes = list(MakeBuilder('int value[42];').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(VariableDeclaration('value', Type('int', array=True)),
                         nodes[0])

    def test_variable_initialization_with_initializer_list(self):
        nodes = list(MakeBuilder('int value = {42};').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(VariableDeclaration('value', Type('int'),
                                             initial_value='{42}'),
                         nodes[0])

    def test_variable_initialization_with_initializer_list2(self):
        nodes = list(MakeBuilder('auto il = {10,20,30};').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(VariableDeclaration('il', Type('auto'),
                                             initial_value='{10,20,30}'),
                         nodes[0])

    def test_variable_initialization_with_function(self):
        nodes = list(MakeBuilder('int value = fct();').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(VariableDeclaration('value', Type('int'),
                                             initial_value='fct()'),
                         nodes[0])

    def test_variable_initialization_with_complex_expression(self):
        nodes = list(MakeBuilder('int value = fct() + 42;').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(VariableDeclaration('value', Type('int'),
                                             initial_value='fct()+42'),
                         nodes[0])

    def test_variable_function_reference(self):
        nodes = list(MakeBuilder('int* (&fn)();').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(VariableDeclaration('fn', Type('int', pointer=True)),
                         nodes[0])

    def test_variable_function_pointer_init(self):
        nodes = list(MakeBuilder('int (*fn)() = 0;').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(VariableDeclaration('fn', Type('int'),
                                             initial_value='0'),
                         nodes[0])

    def test_variable_anonymous_class(self):
        nodes = list(MakeBuilder('class {public:} a;').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(VariableDeclaration('a', Type(Class(None, body=[]))),
                         nodes[0])

    def test_variable_anonymous_class2(self):
        nodes = list(MakeBuilder('const class {public:} a;').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(VariableDeclaration('a', Type(Class(None, body=[]),
                                                       modifiers=['const'])),
                         nodes[0])

    def test_function_one_argument_with_name(self):
        for argument in ('Foo f', 'const Foo f', 'Foo& f', 'const Foo& f',
                         'unsigned int f', 'ns::foo f', 'std::vector<int> f',
                         'const Foo* const f', 'auto f'):
            code = 'void fct(%s);' % argument
            nodes = list(MakeBuilder(code).generate())
            self.assertEqual(1, len(nodes), repr(nodes))
            self.assertEqual(1, len(nodes[0].parameters))
            self.assertEqual('f', nodes[0].parameters[0].name)

    def test_function_one_argument_with_no_name(self):
        for argument in ('Foo', 'const Foo', 'Foo&', 'const Foo&',
                         'unsigned int', 'ns::foo', 'std::vector<int>',
                         'const Foo* const', 'auto int'):
            code = 'void fct(%s);' % argument
            nodes = list(MakeBuilder(code).generate())
            self.assertEqual(1, len(nodes), repr(nodes))
            self.assertEqual(1, len(nodes[0].parameters))
            self.assertEqual(None, nodes[0].parameters[0].name)

    def test_function_return(self):
        for argument in ('class', 'enum', 'struct', 'union'):
            code = '%s A fn();' % argument
            nodes = list(MakeBuilder(code).generate())
            self.assertEqual(1, len(nodes), repr(nodes))
            self.assertEqual(Function('fn', list(get_tokens('A')), []),
                             nodes[0])

    def test_no_argument(self):
        nodes = list(MakeBuilder('FOO();').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Function('FOO', [], []), nodes[0])

    def test_one_argument(self):
        nodes = list(MakeBuilder('FOO(1);').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Function('FOO', [], list(get_tokens('1'))), nodes[0])

    def test_two_arguments(self):
        nodes = list(MakeBuilder('FOO(1,0);').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(
            Function('FOO', [], list(get_tokens('1,0'))), nodes[0])

    def test_two_arguments_first_empty(self):
        nodes = list(MakeBuilder('FOO( ,0);').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Function('FOO', [], list(get_tokens('0'))), nodes[0])

    def test_two_arguments_second_empty(self):
        nodes = list(MakeBuilder('FOO(1, );').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Function('FOO', [], list(get_tokens('1'))), nodes[0])

    def test_two_arguments_both_empty(self):
        nodes = list(MakeBuilder('FOO( , );').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Function('FOO', [], []), nodes[0])

    def test_class_variable_declaration(self):
        nodes = list(MakeBuilder('class Foo foo;').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(
            VariableDeclaration('foo', Type('Foo', modifiers=['class'])),
            nodes[0])

    def test_struct_variable_declaration(self):
        nodes = list(MakeBuilder('struct Foo foo;').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(
            VariableDeclaration('foo', Type('Foo', modifiers=['struct'])),
            nodes[0])

    def test_typedef(self):
        for argument in ('bool', 'char', 'int', 'long', 'short', 'double',
                         'float', 'void', 'wchar_t', 'unsigned', 'signed'):
            code = 'typedef %s Type;' % argument
            nodes = list(MakeBuilder(code).generate())
            self.assertEqual(1, len(nodes), repr(nodes))
            self.assertEqual(Typedef('Type', alias=[Type('%s' % argument)]),
                             nodes[0])

    def test_anon_class_typedef(self):
        nodes = list(MakeBuilder('typedef class { int zz; } Anon;').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(
            Typedef('Anon',
                    alias=[Class(None,
                                 body=[VariableDeclaration('zz',
                                                           Type('int'))])]),
            nodes[0])

    def test_anon_struct_typedef(self):
        nodes = list(
            MakeBuilder('typedef struct { int zz; } Anon;').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(
            Typedef('Anon',
                    alias=[Struct(None,
                                  body=[VariableDeclaration('zz',
                                                            Type('int'))])]),
            nodes[0])

    def test_class_typedef(self):
        nodes = list(
            MakeBuilder('typedef class _IplImage IplImage;').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Typedef('IplImage', alias=[Class('_IplImage')]),
                         nodes[0])

    def test_struct_typedef(self):
        nodes = list(
            MakeBuilder('typedef struct _IplImage IplImage;').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Typedef('IplImage', alias=[Struct('_IplImage')]),
                         nodes[0])

    def test_class_pointer_typedef(self):
        nodes = list(
            MakeBuilder('typedef class _IplImage *IplImage;').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Typedef('IplImage', alias=[Class('_IplImage*')]),
                         nodes[0])

    def test_struct_pointer_typedef(self):
        nodes = list(
            MakeBuilder('typedef struct _IplImage *IplImage;').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Typedef('IplImage', alias=[Struct('_IplImage*')]),
                         nodes[0])

    def test_class_forward_declaration(self):
        nodes = list(MakeBuilder('class Foo;').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Class('Foo', body=None), nodes[0])

    def test_struct_forward_declaration(self):
        nodes = list(MakeBuilder('struct Foo;').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Struct('Foo', body=None), nodes[0])

    def test_class_empty_body(self):
        nodes = list(MakeBuilder('class Foo {};').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Class('Foo', body=[]), nodes[0])

    def test_struct_empty_body(self):
        nodes = list(MakeBuilder('struct Foo {};').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Struct('Foo', body=[]), nodes[0])

    def test_class_final(self):
        nodes = list(MakeBuilder('class Foo final {};').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Class('Foo', body=[]), nodes[0])

    def test_class_exported(self):
        nodes = list(MakeBuilder('class DLLEXPORT Foo {};').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Class('Foo', body=[]), nodes[0])

    def test_struct_exported(self):
        nodes = list(MakeBuilder('struct DLLEXPORT Foo {};').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Struct('Foo', body=[]), nodes[0])

    def test_class_in_namespace_single(self):
        nodes = list(MakeBuilder('namespace N { class Foo; }').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Class('Foo', namespace=['N']), nodes[0])

    def test_class_in_namespace_multiple(self):
        code = 'namespace A { namespace B { namespace C { class Foo; }}}'
        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Class('Foo', namespace=['A', 'B', 'C']), nodes[0])

    def test_class_in_namespace_multiple_with_one_closed(self):
        code = 'namespace A { namespace B {} namespace C { class Foo; }}'
        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Class('Foo', namespace=['A', 'C']), nodes[0])

    def test_class_in_anonymous_namespace_single(self):
        nodes = list(MakeBuilder('namespace { class Foo; }').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Class('Foo', namespace=[None]), nodes[0])

    def test_class_in_anonymous_namespace_multiple(self):
        code = 'namespace A { namespace { namespace B { class Foo; }}}'
        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Class('Foo', namespace=['A', None, 'B']), nodes[0])

    def test_template_typedef(self):
        code = 'class Foo; typedef Bar<Foo*> v;'
        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(2, len(nodes), repr(nodes))
        self.assertEqual(Class('Foo'), nodes[0])
        self.assertEqual(
            Typedef('v',
                    alias=[Type('Bar',
                                templated_types=[Type('Foo', pointer=True)])]),
            nodes[1])

    def test_operators(self):
        for operator in ('=', '+=', '-=', '*=', '==', '!=', '()', '[]', '<',
                         '>', '^=', '<<=', '>>='):
            code = 'void Foo::operator%s();' % operator
            nodes = list(MakeBuilder(code).generate())
            self.assertEqual(1, len(nodes), repr(nodes))
            self.assertEqual(Method(('operator%s' % operator),
                                    list(get_tokens('Foo')),
                                    list(get_tokens('void')), []), nodes[0])

    def test_class_virtual_inheritance(self):
        code = 'class Foo : public virtual Bar {};'
        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Class('Foo', bases=[Type('Bar')], body=[]), nodes[0])

    def test_class_virtual_inheritance_reverse(self):
        code = 'class Foo : virtual public Bar {};'
        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Class('Foo', bases=[Type('Bar')], body=[]), nodes[0])

    def test_constructor(self):
        code = 'Foo::Foo() {}'
        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Method('Foo', list(get_tokens('Foo')), [], [],
                                body=[]),
                         nodes[0])

    def test_destructor(self):
        code = 'Foo::~Foo() {}'
        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Method('~Foo', list(get_tokens('Foo')), [], [],
                                body=[]),
                         nodes[0])

    def test_class_operators(self):
        for operator in ('=', '+=', '-=', '*=', '==', '!=', '()', '[]', '<',
                         '>'):
            code = 'class Foo { void operator%s(); };' % operator
            nodes = list(MakeBuilder(code).generate())
            self.assertEqual(1, len(nodes), repr(nodes))
            function = nodes[0].body[0]
            expected = Function(('operator%s' % operator),
                                list(get_tokens('void')), [])
            self.assertEqual(expected.return_type, function.return_type)
            self.assertEqual(expected, function)
            self.assertEqual(Class('Foo', body=[expected]), nodes[0])

    def test_class_virtual_inline_destructor(self):
        code = 'class Foo { virtual inline ~Foo(); };'
        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        function = nodes[0].body[0]
        expected = Function('Foo', [], [],
                            modifiers=ast.FUNCTION_DTOR | ast.FUNCTION_VIRTUAL)
        self.assertEqual(expected.return_type, function.return_type)
        self.assertEqual(expected, function)
        self.assertEqual(Class('Foo', body=[expected]), nodes[0])

    def test_class_colon_separated_class_name_and_inline_dtor(self):
        method_body = 'XXX(1) << "should work";'
        code = 'class Foo::Bar { ~Bar() { %s } };' % method_body
        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        function = nodes[0].body[0]
        expected = Function('Bar', [], [], body=list(get_tokens(method_body)),
                            modifiers=ast.FUNCTION_DTOR)
        self.assertEqual(expected.return_type, function.return_type)
        self.assertEqual(expected, function)
        self.assertEqual(Class('Foo::Bar', body=[expected]), nodes[0])

    def test_class_handles_struct_rebind(self):
        code = """
        template <typename T, typename Alloc = std::allocator<T> >
        class AnotherAllocator : public Alloc {
            template <class U> struct rebind {
            };
        };
        """
        types1 = {}
        types1['Alloc'] = (None, list(get_tokens('std::allocator<T>')))
        types1['T'] = (None, None)
        types2 = {}
        types2['U'] = (None, None)

        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Class('AnotherAllocator', bases=[Type('Alloc')],
                               body=[Struct('rebind', body=[],
                                            templated_types=types2)],
                               templated_types=types1,),
                         nodes[0])

    def test_function_parses_operator_bracket(self):
        code = """
        class A {
            const B& operator[](const int i) const {}
        };
        """
        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        function = nodes[0].body[0]
        expected = Function('operator[]', list(get_tokens('const B&')),
                            list(get_tokens('const int i')), body=[],
                            modifiers=ast.FUNCTION_SPECIFIER)
        self.assertEqual(expected.return_type, function.return_type)
        self.assertEqual(expected, function)
        self.assertEqual(Class('A', body=[expected]), nodes[0])

    def test_function_parses_template_with_array_access(self):
        code = """
        template <typename T, size_t N>
        char (&ASH(T (&seq)[N]))[N];
        """
        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        # TODO(nnorwitz): this doesn't parse correctly, but at least
        # it doesn't raise an exception anymore. Improve the parsing.

    def test_method_with_template_class_works(self):
        code = """
        template <class T>
        inline void EVM::VH<T>::Write() {
        }
        """
        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        expected = Method('Write', list(get_tokens('EVM::VH<T>')),
                          list(get_tokens('inline void')), [],
                          templated_types={'T': (None, None)},
                          body=[])
        self.assertEqual(expected.return_type, nodes[0].return_type)
        self.assertEqual(expected.in_class, nodes[0].in_class)
        self.assertEqual(expected.templated_types, nodes[0].templated_types)
        self.assertEqual(expected, nodes[0])

    def test_method_with_template_class_with2args_works(self):
        code = """
        template <class T, typename U>
        inline void EVM::VH<T, U>::Write() {
        }
        """
        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        expected = Method('Write', list(get_tokens('EVM::VH<T, U>')),
                          list(get_tokens('inline void')), [],
                          templated_types={'T': (None, None),
                                           'U': (None, None)},
                          body=[])
        self.assertEqual(expected.return_type, nodes[0].return_type)
        self.assertEqual(expected.in_class, nodes[0].in_class)
        self.assertEqual(expected.templated_types, nodes[0].templated_types)
        self.assertEqual(expected, nodes[0])

    def test_method_with_template_class_with3args_works(self):
        code = """
        template <class CT, class IT, class DT>
        DT* Worker<CT, IT, DT>::Create() {
        }
        """
        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        tt = (None, None)
        expected = Method('Create', list(get_tokens('Worker<CT, IT, DT>')),
                          list(get_tokens('DT*')), [],
                          templated_types={'CT': tt, 'IT': tt, 'DT': tt},
                          body=[])
        self.assertEqual(expected.return_type, nodes[0].return_type)
        self.assertEqual(expected.in_class, nodes[0].in_class)
        self.assertEqual(expected.templated_types, nodes[0].templated_types)
        self.assertEqual(expected, nodes[0])

    def test_include_with_backslash_continuation_works(self):
        nodes = list(MakeBuilder('#include \\\n  "test.h"').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Include('test.h'), nodes[0])

    def test_system_include(self):
        nodes = list(MakeBuilder('#include <vector>').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Include('vector', system=True), nodes[0])

    def test_operator_new_bracket(self):
        nodes = list(
            MakeBuilder('void* operator new[](std::size_t size);').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        expected = Function('new[]', list(get_tokens('void* operator')),
                            list(get_tokens('std::size_t size')))
        self.assertEqual(expected, nodes[0])

    def test_operator_delete_bracket(self):
        nodes = list(
            MakeBuilder('void operator delete[](void* ptr);').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        expected = Function('delete[]', list(get_tokens('void operator')),
                            list(get_tokens('void* ptr')))
        self.assertEqual(expected, nodes[0])

    def test_define(self):
        nodes = list(MakeBuilder('#define FOO 42').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Define('FOO', '42'), nodes[0])

    def test_define_with_backslash_continuation(self):
        nodes = list(MakeBuilder('#define \\\n FOO 42').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Define('FOO', '42'), nodes[0])

    def test_define_with_backslash_continuation_between_declaration(self):
        nodes = list(MakeBuilder('#define FOO \\\n 42').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Define('FOO', '42'), nodes[0])

    def test_empty_define(self):
        nodes = list(MakeBuilder('#define FOO').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Define('FOO', ''), nodes[0])

    def test_function_like_define(self):
        nodes = list(MakeBuilder('#define FOO(a, b) a##b').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Define('FOO', 'a##b'), nodes[0])

    def test_function_like_define_no_space(self):
        nodes = list(MakeBuilder('#define FOO(a, b)a##b').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Define('FOO', 'a##b'), nodes[0])

    def test_variable_declaration_with_define(self):
        code = """
        #define FOO(str) Type##str
        int FOO(name);
        #undef FOO
        void FOO();
        """
        nodes = list(MakeBuilder(code).generate())
        self.assertEqual(3, len(nodes), repr(nodes))
        self.assertEqual(Define('FOO', 'Type##str'), nodes[0])
        self.assertEqual(VariableDeclaration('FOO', Type('int')), nodes[1])
        self.assertEqual(Function('FOO', list(get_tokens('void')), []),
                         nodes[2])

    def test_template_function(self):
        nodes = list(MakeBuilder('template <> void equal<0>();').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(
            Function('equal', list(get_tokens('void')), [],
                     specializations=[Type('0')],
                     templated_types={}),
            nodes[0])

    def test_explicit_template_instantiation(self):
        nodes = list(
            MakeBuilder('template class basic_string<int>;').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(Class('basic_string<int>'), nodes[0])

    def test_inline_function(self):
        nodes = list(MakeBuilder('inline void fn();').generate())
        self.assertEqual(1, len(nodes), repr(nodes))
        self.assertEqual(
            Function('fn', list(get_tokens('void')), []),
            nodes[0])

if __name__ == '__main__':
    unittest.main()