"""Utilities for writing code that runs on Python 2 and 3"""

# Copyright (c) 2010-2012 Benjamin Peterson
#
# Permission is hereby granted, free of charge, to any person obtaining a copy of
# this software and associated documentation files (the "Software"), to deal in
# the Software without restriction, including without limitation the rights to
# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
# the Software, and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
# FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
# COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
# IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

import operator
import sys
import types

__author__ = "Benjamin Peterson <benjamin@python.org>"
__version__ = "1.2.0"


# True if we are running on Python 3.
PY3 = sys.version_info[0] == 3

if PY3:
    string_types = str,
    integer_types = int,
    class_types = type,
    text_type = str
    binary_type = bytes

    MAXSIZE = sys.maxsize
else:
    string_types = basestring,
    integer_types = (int, long)
    class_types = (type, types.ClassType)
    text_type = unicode
    binary_type = str

    if sys.platform.startswith("java"):
        # Jython always uses 32 bits.
        MAXSIZE = int((1 << 31) - 1)
    else:
        # It's possible to have sizeof(long) != sizeof(Py_ssize_t).
        class X(object):
            def __len__(self):
                return 1 << 31
        try:
            len(X())
        except OverflowError:
            # 32-bit
            MAXSIZE = int((1 << 31) - 1)
        else:
            # 64-bit
            MAXSIZE = int((1 << 63) - 1)
            del X


def _add_doc(func, doc):
    """Add documentation to a function."""
    func.__doc__ = doc


def _import_module(name):
    """Import module, returning the module after the last dot."""
    __import__(name)
    return sys.modules[name]


# Replacement for lazy loading stuff in upstream six.  See gh-2764
if PY3:
    import builtins
    import functools
    reduce = functools.reduce
    zip = builtins.zip
    xrange = builtins.range
else:
    import __builtin__
    import itertools
    builtins = __builtin__
    reduce = __builtin__.reduce
    zip = itertools.izip
    xrange = __builtin__.xrange


if PY3:
    _meth_func = "__func__"
    _meth_self = "__self__"

    _func_code = "__code__"
    _func_defaults = "__defaults__"

    _iterkeys = "keys"
    _itervalues = "values"
    _iteritems = "items"
else:
    _meth_func = "im_func"
    _meth_self = "im_self"

    _func_code = "func_code"
    _func_defaults = "func_defaults"

    _iterkeys = "iterkeys"
    _itervalues = "itervalues"
    _iteritems = "iteritems"


try:
    advance_iterator = next
except NameError:
    def advance_iterator(it):
        return it.next()
next = advance_iterator


if PY3:
    def get_unbound_function(unbound):
        return unbound

    Iterator = object

    def callable(obj):
        return any("__call__" in klass.__dict__ for klass in type(obj).__mro__)
else:
    def get_unbound_function(unbound):
        return unbound.im_func

    class Iterator(object):

        def next(self):
            return type(self).__next__(self)

    callable = callable
_add_doc(get_unbound_function,
         """Get the function out of a possibly unbound function""")


get_method_function = operator.attrgetter(_meth_func)
get_method_self = operator.attrgetter(_meth_self)
get_function_code = operator.attrgetter(_func_code)
get_function_defaults = operator.attrgetter(_func_defaults)


def iterkeys(d):
    """Return an iterator over the keys of a dictionary."""
    return iter(getattr(d, _iterkeys)())


def itervalues(d):
    """Return an iterator over the values of a dictionary."""
    return iter(getattr(d, _itervalues)())


def iteritems(d):
    """Return an iterator over the (key, value) pairs of a dictionary."""
    return iter(getattr(d, _iteritems)())


if PY3:
    def b(s):
        return s.encode("latin-1")

    def u(s):
        return s

    if sys.version_info[1] <= 1:
        def int2byte(i):
            return bytes((i,))
    else:
        # This is about 2x faster than the implementation above on 3.2+
        int2byte = operator.methodcaller("to_bytes", 1, "big")
    import io
    StringIO = io.StringIO
    BytesIO = io.BytesIO
else:
    def b(s):
        return s

    def u(s):
        return unicode(s, "unicode_escape")
    int2byte = chr
    import StringIO
    StringIO = BytesIO = StringIO.StringIO
_add_doc(b, """Byte literal""")
_add_doc(u, """Text literal""")


if PY3:
    import builtins
    exec_ = getattr(builtins, "exec")

    def reraise(tp, value, tb=None):
        if value.__traceback__ is not tb:
            raise value.with_traceback(tb)
        raise value

    print_ = getattr(builtins, "print")
    del builtins

else:
    def exec_(code, globs=None, locs=None):
        """Execute code in a namespace."""
        if globs is None:
            frame = sys._getframe(1)
            globs = frame.f_globals
            if locs is None:
                locs = frame.f_locals
            del frame
        elif locs is None:
            locs = globs
        exec("""exec code in globs, locs""")

    exec_("""def reraise(tp, value, tb=None):
    raise tp, value, tb
""")

    def print_(*args, **kwargs):
        """The new-style print function."""
        fp = kwargs.pop("file", sys.stdout)
        if fp is None:
            return

        def write(data):
            if not isinstance(data, basestring):
                data = str(data)
            fp.write(data)
        want_unicode = False
        sep = kwargs.pop("sep", None)
        if sep is not None:
            if isinstance(sep, unicode):
                want_unicode = True
            elif not isinstance(sep, str):
                raise TypeError("sep must be None or a string")
        end = kwargs.pop("end", None)
        if end is not None:
            if isinstance(end, unicode):
                want_unicode = True
            elif not isinstance(end, str):
                raise TypeError("end must be None or a string")
        if kwargs:
            raise TypeError("invalid keyword arguments to print()")
        if not want_unicode:
            for arg in args:
                if isinstance(arg, unicode):
                    want_unicode = True
                    break
        if want_unicode:
            newline = unicode("\n")
            space = unicode(" ")
        else:
            newline = "\n"
            space = " "
        if sep is None:
            sep = space
        if end is None:
            end = newline
        for i, arg in enumerate(args):
            if i:
                write(sep)
            write(arg)
        write(end)

_add_doc(reraise, """Reraise an exception.""")


def with_metaclass(meta, base=object):
    """Create a base class with a metaclass."""
    return meta("NewBase", (base,), {})
