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287 | -- --
-- package Py.Class Copyright (c) Dmitry A. Kazakov --
-- Implementation Luebeck --
-- Summer, 2022 --
-- --
-- Last revision : 20:47 23 Jun 2022 --
-- --
-- This library is free software; you can redistribute it and/or --
-- modify it under the terms of the GNU General Public License as --
-- published by the Free Software Foundation; either version 2 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 --
-- General Public License for more details. You should have --
-- received a copy of the GNU General Public License along with --
-- this library; if not, write to the Free Software Foundation, --
-- Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. --
-- --
-- As a special exception, if other files instantiate generics from --
-- this unit, or you link this unit with other files to produce an --
-- executable, this unit does not by itself cause the resulting --
-- executable to be covered by the GNU General Public License. This --
-- exception does not however invalidate any other reasons why the --
-- executable file might be covered by the GNU Public License. --
--____________________________________________________________________--
with System.Storage_Elements; use System.Storage_Elements;
with Ada.Numerics.Elementary_Functions;
with Ada.Unchecked_Conversion;
with Ada.Unchecked_Deallocation;
package body Py.Class is
function Get_X
( Self : Object;
Closure : System.Address
) return Object;
pragma Convention (C, Get_X);
function Get_Y
( Self : Object;
Closure : System.Address
) return Object;
pragma Convention (C, Get_Y);
function Length (Self : Object; Arg : Object) return Object;
pragma Convention (C, Length);
function New_Instance
( Class : Object;
Args : Object;
Keywords : Object
) return Object;
pragma Convention (C, New_Instance);
function Set_X
( Self : Object;
Value : Object;
Closure : System.Address
) return int;
pragma Convention (C, Set_X);
function Set_Y
( Self : Object;
Value : Object;
Closure : System.Address
) return int;
pragma Convention (C, Set_Y);
function Get (Object : Handle) return Point is
begin
Check_Handle (Object); -- Not checking the object type because we
declare -- do not keep it anywhere
This : Point;
pragma Import (Ada, This);
for This'Address use System.Address (Object.Ptr)
+ Storage_Offset (Object_HeadSize);
begin
return This;
end;
end Get;
function Get_X
( Self : Object;
Closure : System.Address
) return Object is
This : Point;
pragma Import (Ada, This);
for This'Address use System.Address (Self)
+ Storage_Offset (Object_HeadSize);
begin
return Links.Float_FromDouble (double (This.X));
exception
when Python_Error =>
return Null_Object;
when others =>
Throw_ValueError ("Invalid x");
return Null_Object;
end Get_X;
function Get_Y
( Self : Object;
Closure : System.Address
) return Object is
This : Point;
pragma Import (Ada, This);
for This'Address use System.Address (Self)
+ Storage_Offset (Object_HeadSize);
begin
return Links.Float_FromDouble (double (This.Y));
exception
when Python_Error =>
return Null_Object;
when others =>
Throw_ValueError ("Invalid y");
return Null_Object;
end Get_Y;
function Length (Self : Object; Arg : Object) return Object is
use Ada.Numerics.Elementary_Functions;
This : Point;
pragma Import (Ada, This);
for This'Address use System.Address (Self)
+ Storage_Offset (Object_HeadSize);
begin
return
Links.Float_FromDouble (double (Sqrt (This.X**2 +This.Y**2 )));
exception
when Python_Error =>
return Null_Object;
when others =>
Throw_ValueError ("Error in length");
return Null_Object;
end Length;
New_List : constant Argument_List := - "x" - "y";
function New_Instance
( Class : Object;
Args : Object;
Keywords : Object
) return Object is
Result : Object;
begin
declare
List : constant Object_Array :=
Parse (Args, Keywords, New_List);
X, Y : Float := 0.0;
begin
if List (1) /= Null_Object then
X := Float (Links.Float_AsDouble (List (1)));
Check_Error;
end if;
if List (2) /= Null_Object then
Y := Float (Links.Float_AsDouble (List (2)));
Check_Error;
end if;
Result := -- Allocate the object
Links.Type_GetSlot (Class, tp_alloc).tp_alloc (Class, 0);
declare
This : Point;
pragma Import (Ada, This);
for This'Address use System.Address (Result)
+ Storage_Offset (Object_HeadSize);
begin
This.X := X;
This.Y := Y;
end;
end;
return Result;
exception
when Constraint_Error =>
Throw_TypeError ("Argument is out of range");
return Null_Object;
when Python_Error =>
return Null_Object;
end New_Instance;
procedure Set (Object : Handle; Value : Point) is
begin
Check_Handle (Object); -- Not checking the object type because we
declare -- do not keep it anywhere
This : Point;
pragma Import (Ada, This);
for This'Address use System.Address (Object.Ptr)
+ Storage_Offset (Object_HeadSize);
begin
This := Value;
end;
end Set;
function Set_X
( Self : Object;
Value : Object;
Closure : System.Address
) return int is
This : Point;
pragma Import (Ada, This);
for This'Address use System.Address (Self)
+ Storage_Offset (Object_HeadSize);
begin
This.X := Float (Links.Float_AsDouble (Value));
return 0;
exception
when Python_Error =>
return -1;
when others =>
Throw_TypeError ("Error setting x");
return -1;
end Set_X;
function Set_Y
( Self : Object;
Value : Object;
Closure : System.Address
) return int is
This : Point;
pragma Import (Ada, This);
for This'Address use System.Address (Self)
+ Storage_Offset (Object_HeadSize);
begin
This.Y := Float (Links.Float_AsDouble (Value));
return 0;
exception
when Python_Error =>
return -1;
when others =>
Throw_TypeError ("Error setting y");
return -1;
end Set_Y;
GetSets : array (1..3) of aliased GetSetDef := -- Must be exist when
( ( Name => New_String ("x"), -- the type does
Get => Get_X'Access,
Set => Set_X'Access,
Doc => New_String ("x-coordinate"),
Closure => System.Null_Address
),
( Name => New_String ("y"),
Get => Get_Y'Access,
Set => Set_Y'Access,
Doc => New_String ("y-coordinate"),
Closure => System.Null_Address
),
End_GetSet
);
Methods : array (1..2) of aliased MethodDef :=
( ( Name => New_String ("length"),
Meth => (False, Length'Access),
Flags => METH_NOARGS,
Doc => New_String ("vector length")
),
End_Method
);
function Create_Point_Type return Handle is
Result : Handle;
Module : Handle;
Doc : aliased char_array := "point example" & NUL;
Slots : array (1..5) of aliased Type_Slot :=
( (tp_doc, (tp_doc, To_Chars_Ptr (Doc'Unchecked_Access))),
(tp_new, (tp_new, New_Instance'Access)),
(tp_getset, (tp_getset, GetSets (1)'Unchecked_Access)),
(tp_methods, (tp_methods, Methods (1)'Unchecked_Access)),
End_Slot
);
begin
Result.Ptr :=
Links.Type_FromSpec
( ( Name => New_String ("point"),
Basic_Size =>
int (Object_HeadSize + (Point'Size + 7) / 8),
Item_Size => 0,
Flags => TPFLAGS_DEFAULT + TPFLAGS_HEAPTYPE,
Slots => Slots (Slots'First)'Unchecked_Access
) );
if Result.Ptr = Null_Object then
Check_Error;
end if;
Module := Import_AddModule ("point");
Module_AddObject (Module, "point", Result);
return Result;
end Create_Point_Type;
end Py.Class;
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