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# dialects/__init__.py
# Copyright (C) 2005-2019 the SQLAlchemy authors and contributors
# <see AUTHORS file>
#
# This module is part of SQLAlchemy and is released under
# the MIT License: http://www.opensource.org/licenses/mit-license.php

__all__ = (
    "firebird",
    "mssql",
    "mysql",
    "oracle",
    "postgresql",
    "sqlite",
    "sybase",
)

from .. import util


_translates = {"postgres": "postgresql"}


def _auto_fn(name):
    """default dialect importer.

    plugs into the :class:`.PluginLoader`
    as a first-hit system.

    """
    if "." in name:
        dialect, driver = name.split(".")
    else:
        dialect = name
        driver = "base"

    if dialect in _translates:
        translated = _translates[dialect]
        util.warn_deprecated(
            "The '%s' dialect name has been "
            "renamed to '%s'" % (dialect, translated)
        )
        dialect = translated
    try:
        module = __import__("sqlalchemy.dialects.%s" % (dialect,)).dialects
    except ImportError:
        return None

    module = getattr(module, dialect)
    if hasattr(module, driver):
        module = getattr(module, driver)
        return lambda: module.dialect
    else:
        return None


registry = util.PluginLoader("sqlalchemy.dialects", auto_fn=_auto_fn)

plugins = util.PluginLoader("sqlalchemy.plugins")