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Current File : /usr/lib/python3.6/site-packages/dasbus/typing.py
#
# Support for DBus types
#
# Copyright (C) 2019  Red Hat, Inc.  All rights reserved.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
# USA
#
# For more info about DBus type system see:
# https://dbus.freedesktop.org/doc/dbus-specification.html#type-system.
#

from typing import Tuple, Dict, List, NewType, IO

import gi
gi.require_version("GLib", "2.0")
from gi.repository.GLib import Variant, VariantType

__all__ = [
    "Bool",
    "Str",
    "Double",
    "Byte",
    "Int",
    "Int16",
    "UInt16",
    "Int32",
    "UInt32",
    "Int64",
    "UInt64",
    "File",
    "ObjPath",
    "Variant",
    "VariantType",
    "Tuple",
    "List",
    "Dict",
    "Structure",
    "get_native",
    "get_variant",
    "get_variant_type",
    "unwrap_variant",
    "is_base_type",
    "get_type_arguments",
    "get_dbus_type",
]

# Basic types.
Bool = bool
Double = float
Str = str

# Default integer type: int will be treated as Int32.
Int = int

# All integer types.
Byte = NewType('Byte', int)
Int16 = NewType('Int16', int)
UInt16 = NewType('UInt16', int)
Int32 = NewType('Int32', int)
UInt32 = NewType('UInt32', int)
Int64 = NewType('Int64', int)
UInt64 = NewType('UInt64', int)

# Type of a file handler.
File = IO

# Type of an object path.
ObjPath = NewType('ObjPath', str)

# Container types.
# Use Tuple, Dict and List from typing.
# Use Variant from GLib and get_variant.
# Use Structure instead of Dict[Str, Variant].
Structure = Dict[Str, Variant]


def get_dbus_type(type_hint):
    """Return DBus representation of a type hint.

    :param type_hint: a type hint
    :return: a string with DBus representation
    """
    return DBusType.get_dbus_representation(type_hint)


def get_variant(type_hint, value):
    """Return a variant data type.

    The type of a variant is specified with
    a type hint.

    Example:

    .. code-block:: python

         v1 = get_variant(Bool, True)
         v2 = get_variant(List[Int], [1,2,3])

    :param type_hint: a type hint or a type string
    :param value: a value of the variant
    :return: an instance of Variant
    """
    if type(type_hint) == str:
        type_string = type_hint
    else:
        type_string = get_dbus_type(type_hint)

    if value is None:
        raise TypeError("Invalid DBus value 'None'.")

    return Variant(type_string, value)


def get_variant_type(type_hint):
    """Return a type of a variant data type.

    :param type_hint: a type hint or a type string
    :return: an instance of VariantType
    """
    if type(type_hint) == str:
        type_string = type_hint
    else:
        type_string = get_dbus_type(type_hint)

    return VariantType.new(type_string)


def get_native(value):
    """Decompose a DBus value into a native Python object.

    This function is useful for testing, when the DBus library
    doesn't decompose arguments and return values of DBus calls.

    :param value: a DBus value
    :return: a native Python object
    """
    if isinstance(value, Variant):
        return value.unpack()

    if isinstance(value, tuple):
        return tuple(map(get_native, value))

    if isinstance(value, list):
        return list(map(get_native, value))

    if isinstance(value, dict):
        return {k: get_native(v) for k, v in value.items()}

    return value


def unwrap_variant(variant):
    """Unwrap a variant data type.

    Unlike the unpack method of the Variant class, this function
    doesn't recursively unpacks all variants in the data structure.
    It will unpack only the topmost variant.

    The implementation is inspired by the unpack method.

    :param variant: a variant
    :return: a value
    """
    type_string = variant.get_type_string()

    # tuple - unwrap items
    if type_string.startswith('('):
        return tuple(
            unwrap_variant(variant.get_child_value(i))
            for i in range(variant.n_children())
        )

    # dictionary - unpack keys and unwrap values.
    if type_string.startswith('a{'):
        result = {}

        for i in range(variant.n_children()):
            entry = variant.get_child_value(i)
            key = entry.get_child_value(0)
            value = entry.get_child_value(1)
            result[key.unpack()] = unwrap_variant(value)

        return result

    # array - unwrap values
    if type_string.startswith('a'):
        return list(
            unwrap_variant(variant.get_child_value(i))
            for i in range(variant.n_children())
        )

    # variant - unbox a variant
    if type_string.startswith('v'):
        return variant.get_variant()

    # basic - unpack a value
    return variant.unpack()


def is_base_type(type_hint, base_type):
    """Is the given base type a base of the specified type hint?

    For example, List is a base of the type hint List[Int] and
    Int is a base of the type hint Int. A class is a base of
    itself and of every subclass of this class.

    :param type_hint: a type hint
    :param base_type: a base type
    :return: True or False
    """
    type_hint = getattr(type_hint, "__origin__", type_hint)

    if type_hint == base_type:
        return True

    try:
        return issubclass(type_hint, base_type)
    except TypeError:
        pass

    return False


def get_type_arguments(type_hint):
    """Get the arguments of the type hint.

    For example, Str and Int are arguments of the type hint Tuple(Str, Int).

    :param type_hint: a type hint
    :return: a type arguments
    """
    return getattr(type_hint, "__args__", ())


def get_type_name(type_hint):
    """Get the name of the type hint.

    :param type_hint: a type hint
    :return: a name of the type hint
    """
    return getattr(type_hint, "__name__", str(type_hint))


class DBusType(object):
    """Class for transforming type hints to DBus types."""

    # DBus representation of basic types.
    _basic_type_mapping = {
        # Basic types.
        Bool:       "b",
        Str:        "s",
        Double:     "d",
        # Default integer.
        Int:        "i",
        # Integer types.
        Byte:       "y",
        Int16:      "n",
        UInt16:     "q",
        Int32:      "i",
        UInt32:     "u",
        Int64:      "x",
        UInt64:     "t",
        # Other basic types.
        File:       "h",
        ObjPath:    "o",
        Variant:    "v"
    }

    # DBus representation of container types.
    _container_type_mapping = {
        Tuple:      "(%s)",
        List:       "a%s",
        Dict:       "a{%s}",
    }

    @staticmethod
    def get_dbus_representation(type_hint):
        """Return a DBus representation of the given type hint.

        :param type_hint: a type hint
        :return str: a DBus representation of the type hint

        :raises ValueError: for unknown types
        """
        # Try base types.
        if DBusType._is_basic_type(type_hint):
            return DBusType._get_basic_type(type_hint)

        # Try container types.
        if DBusType._is_container_type(type_hint):
            return DBusType._get_container_type(type_hint)

        # Or raise an error.
        raise TypeError(
            "Invalid DBus type '{}'.".format(
                get_type_name(type_hint)
            )
        )

    @staticmethod
    def _is_basic_type(type_hint):
        """Is it a basic type?"""
        return type_hint in DBusType._basic_type_mapping

    @staticmethod
    def _get_basic_type(type_hint):
        """Return a basic type."""
        return DBusType._basic_type_mapping[type_hint]

    @staticmethod
    def _is_container_type(type_hint):
        """Is it a container type?"""
        return DBusType._get_container_base_type(type_hint) is not None

    @staticmethod
    def _get_container_base_type(type_hint):
        """Return a container base type."""
        # Return the container base type of the "origin" or None.
        # See: https://bugzilla.redhat.com/show_bug.cgi?id=1598574
        for base_type in DBusType._container_type_mapping:
            if is_base_type(type_hint, base_type):
                return base_type

        return None

    @staticmethod
    def _get_container_type(type_hint):
        """Return a container type."""
        basetype = DBusType._get_container_base_type(type_hint)

        # Get the arguments of the container.
        args = get_type_arguments(type_hint)

        # Check the typing.
        if basetype == Dict:
            DBusType._check_if_valid_dictionary(type_hint)

        # Generate string.
        container = DBusType._container_type_mapping[basetype]
        items = [DBusType.get_dbus_representation(arg) for arg in args]
        return container % "".join(items)

    @staticmethod
    def _check_if_valid_dictionary(type_hint):
        """Check the type of a dictionary.

        :raises ValueError: for invalid type
        """
        key, _ = get_type_arguments(type_hint)

        if DBusType._is_container_type(key) or key == Variant:
            raise TypeError(
                "Invalid DBus type of dictionary key: "
                "'{}'".format(get_type_name(key))
            )

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