#!/usr/bin/env python
#
# Copyright 2007 Neal Norwitz
# Portions Copyright 2007 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.

"""C++ keywords and helper utilities for determining keywords."""

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


try:
    # Python 3.x
    import builtins
except ImportError:
    # Python 2.x
    import __builtin__ as builtins


if not hasattr(builtins, "set"):
    # Nominal support for Python 2.3.
    from sets import Set as set


TYPES = set(
    "bool char int long short double float void wchar_t unsigned signed".split()
)
TYPE_MODIFIERS = set(
    "auto register const inline extern static virtual volatile mutable".split()
)
ACCESS = set("public protected private friend".split())

CASTS = set("static_cast const_cast dynamic_cast reinterpret_cast".split())

OTHERS = set(
    "true false asm class namespace using explicit this operator sizeof".split()
)
OTHER_TYPES = set(
    "new delete typedef struct union enum typeid typename template".split()
)

CONTROL = set("case switch default if else return goto".split())
EXCEPTION = set("try catch throw".split())
LOOP = set("while do for break continue".split())

ALL = (
    TYPES
    | TYPE_MODIFIERS
    | ACCESS
    | CASTS
    | OTHERS
    | OTHER_TYPES
    | CONTROL
    | EXCEPTION
    | LOOP
)


def IsKeyword(token):
    return token in ALL


def IsBuiltinType(token):
    if token in ("virtual", "inline"):
        # These only apply to methods, they can't be types by themselves.
        return False
    return token in TYPES or token in TYPE_MODIFIERS