terminal_interface-curses-forms-field_types.adb [plain text]
with Terminal_Interface.Curses.Aux; use Terminal_Interface.Curses.Aux;
with Ada.Unchecked_Deallocation;
with Ada.Unchecked_Conversion;
package body Terminal_Interface.Curses.Forms.Field_Types is
use type System.Address;
pragma Warnings (Off);
function To_Argument_Access is new Ada.Unchecked_Conversion
(System.Address, Argument_Access);
pragma Warnings (On);
function Get_Fieldtype (F : Field) return C_Field_Type;
pragma Import (C, Get_Fieldtype, "field_type");
function Get_Arg (F : Field) return System.Address;
pragma Import (C, Get_Arg, "field_arg");
function Get_Type (Fld : in Field) return Field_Type_Access
is
Low_Level : constant C_Field_Type := Get_Fieldtype (Fld);
Arg : Argument_Access;
begin
if Low_Level = Null_Field_Type then
return null;
else
if Low_Level = M_Builtin_Router or else
Low_Level = M_Generic_Type or else
Low_Level = M_Choice_Router or else
Low_Level = M_Generic_Choice then
Arg := To_Argument_Access (Get_Arg (Fld));
if Arg = null then
raise Form_Exception;
else
return Arg.Typ;
end if;
else
raise Form_Exception;
end if;
end if;
end Get_Type;
function Make_Arg (Args : System.Address) return System.Address
is
type V is access all System.Address;
function To_Access is new Ada.Unchecked_Conversion (System.Address,
V);
begin
return To_Access (To_Access (Args).all).all;
end Make_Arg;
function Copy_Arg (Usr : System.Address) return System.Address
is
begin
return Usr;
end Copy_Arg;
procedure Free_Arg (Usr : in System.Address)
is
procedure Free_Type is new Ada.Unchecked_Deallocation
(Field_Type'Class, Field_Type_Access);
procedure Freeargs is new Ada.Unchecked_Deallocation
(Argument, Argument_Access);
To_Be_Free : Argument_Access := To_Argument_Access (Usr);
Low_Level : C_Field_Type;
begin
if To_Be_Free /= null then
if To_Be_Free.Usr /= System.Null_Address then
Low_Level := To_Be_Free.Cft;
if Low_Level.Freearg /= null then
Low_Level.Freearg (To_Be_Free.Usr);
end if;
end if;
if To_Be_Free.Typ /= null then
Free_Type (To_Be_Free.Typ);
end if;
Freeargs (To_Be_Free);
end if;
end Free_Arg;
procedure Wrap_Builtin (Fld : Field;
Typ : Field_Type'Class;
Cft : C_Field_Type := C_Builtin_Router)
is
Usr_Arg : constant System.Address := Get_Arg (Fld);
Low_Level : constant C_Field_Type := Get_Fieldtype (Fld);
Arg : Argument_Access;
Res : Eti_Error;
function Set_Fld_Type (F : Field := Fld;
Cf : C_Field_Type := Cft;
Arg1 : Argument_Access) return C_Int;
pragma Import (C, Set_Fld_Type, "set_field_type");
begin
pragma Assert (Low_Level /= Null_Field_Type);
if Cft /= C_Builtin_Router and then Cft /= C_Choice_Router then
raise Form_Exception;
else
Arg := new Argument'(Usr => System.Null_Address,
Typ => new Field_Type'Class'(Typ),
Cft => Get_Fieldtype (Fld));
if Usr_Arg /= System.Null_Address then
if Low_Level.Copyarg /= null then
Arg.Usr := Low_Level.Copyarg (Usr_Arg);
else
Arg.Usr := Usr_Arg;
end if;
end if;
Res := Set_Fld_Type (Arg1 => Arg);
if Res /= E_Ok then
Eti_Exception (Res);
end if;
end if;
end Wrap_Builtin;
function Field_Check_Router (Fld : Field;
Usr : System.Address) return C_Int
is
Arg : constant Argument_Access := To_Argument_Access (Usr);
begin
pragma Assert (Arg /= null and then Arg.Cft /= Null_Field_Type
and then Arg.Typ /= null);
if Arg.Cft.Fcheck /= null then
return Arg.Cft.Fcheck (Fld, Arg.Usr);
else
return 1;
end if;
end Field_Check_Router;
function Char_Check_Router (Ch : C_Int;
Usr : System.Address) return C_Int
is
Arg : constant Argument_Access := To_Argument_Access (Usr);
begin
pragma Assert (Arg /= null and then Arg.Cft /= Null_Field_Type
and then Arg.Typ /= null);
if Arg.Cft.Ccheck /= null then
return Arg.Cft.Ccheck (Ch, Arg.Usr);
else
return 1;
end if;
end Char_Check_Router;
function Next_Router (Fld : Field;
Usr : System.Address) return C_Int
is
Arg : constant Argument_Access := To_Argument_Access (Usr);
begin
pragma Assert (Arg /= null and then Arg.Cft /= Null_Field_Type
and then Arg.Typ /= null);
if Arg.Cft.Next /= null then
return Arg.Cft.Next (Fld, Arg.Usr);
else
return 1;
end if;
end Next_Router;
function Prev_Router (Fld : Field;
Usr : System.Address) return C_Int
is
Arg : constant Argument_Access := To_Argument_Access (Usr);
begin
pragma Assert (Arg /= null and then Arg.Cft /= Null_Field_Type
and then Arg.Typ /= null);
if Arg.Cft.Prev /= null then
return Arg.Cft.Prev (Fld, Arg.Usr);
else
return 1;
end if;
end Prev_Router;
function C_Builtin_Router return C_Field_Type
is
Res : Eti_Error;
T : C_Field_Type;
begin
if M_Builtin_Router = Null_Field_Type then
T := New_Fieldtype (Field_Check_Router'Access,
Char_Check_Router'Access);
if T = Null_Field_Type then
raise Form_Exception;
else
Res := Set_Fieldtype_Arg (T,
Make_Arg'Access,
Copy_Arg'Access,
Free_Arg'Access);
if Res /= E_Ok then
Eti_Exception (Res);
end if;
end if;
M_Builtin_Router := T;
end if;
pragma Assert (M_Builtin_Router /= Null_Field_Type);
return M_Builtin_Router;
end C_Builtin_Router;
function C_Choice_Router return C_Field_Type
is
Res : Eti_Error;
T : C_Field_Type;
begin
if M_Choice_Router = Null_Field_Type then
T := New_Fieldtype (Field_Check_Router'Access,
Char_Check_Router'Access);
if T = Null_Field_Type then
raise Form_Exception;
else
Res := Set_Fieldtype_Arg (T,
Make_Arg'Access,
Copy_Arg'Access,
Free_Arg'Access);
if Res /= E_Ok then
Eti_Exception (Res);
end if;
Res := Set_Fieldtype_Choice (T,
Next_Router'Access,
Prev_Router'Access);
if Res /= E_Ok then
Eti_Exception (Res);
end if;
end if;
M_Choice_Router := T;
end if;
pragma Assert (M_Choice_Router /= Null_Field_Type);
return M_Choice_Router;
end C_Choice_Router;
end Terminal_Interface.Curses.Forms.Field_Types;