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# Copyright (c) 2001-2007 Twisted Matrix Laboratories.
# 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.

"""Error formatting function for Windows.

The code is taken from twisted.python.win32 module.
"""

from __future__ import absolute_import
import os


__all__ = ['formatError']


class _ErrorFormatter(object):
    """
    Formatter for Windows error messages.

    @ivar winError: A callable which takes one integer error number argument
        and returns an L{exceptions.WindowsError} instance for that error (like
        L{ctypes.WinError}).

    @ivar formatMessage: A callable which takes one integer error number
        argument and returns a C{str} giving the message for that error (like
        L{win32api.FormatMessage}).

    @ivar errorTab: A mapping from integer error numbers to C{str} messages
        which correspond to those errors (like L{socket.errorTab}).
    """
    def __init__(self, WinError, FormatMessage, errorTab):
        self.winError = WinError
        self.formatMessage = FormatMessage
        self.errorTab = errorTab

    def fromEnvironment(cls):
        """
        Get as many of the platform-specific error translation objects as
        possible and return an instance of C{cls} created with them.
        """
        try:
            from ctypes import WinError
        except ImportError:
            WinError = None
        try:
            from win32api import FormatMessage
        except ImportError:
            FormatMessage = None
        try:
            from socket import errorTab
        except ImportError:
            errorTab = None
        return cls(WinError, FormatMessage, errorTab)
    fromEnvironment = classmethod(fromEnvironment)

    def formatError(self, errorcode):
        """
        Returns the string associated with a Windows error message, such as the
        ones found in socket.error.

        Attempts direct lookup against the win32 API via ctypes and then
        pywin32 if available), then in the error table in the socket module,
        then finally defaulting to C{os.strerror}.

        @param errorcode: the Windows error code
        @type errorcode: C{int}

        @return: The error message string
        @rtype: C{str}
        """
        if self.winError is not None:
            return str(self.winError(errorcode))
        if self.formatMessage is not None:
            return self.formatMessage(errorcode)
        if self.errorTab is not None:
            result = self.errorTab.get(errorcode)
            if result is not None:
                return result
        return os.strerror(errorcode)

formatError = _ErrorFormatter.fromEnvironment().formatError