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108 | -- --
-- package Strings_Edit.Fields Copyright (c) Dmitry A. Kazakov --
-- Implementation Luebeck --
-- Spring, 2002 --
-- --
-- Last revision : 21:03 21 Apr 2009 --
-- --
-- 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 Ada.IO_Exceptions; use Ada.IO_Exceptions;
package body Strings_Edit.Fields is
function Get_Output_Field
( Destination : String;
Pointer : Integer;
Field : Natural
) return Natural is
Result : Natural := Field;
begin
if Result = 0 then
Result := Destination'Last - Pointer + 1;
end if;
if ( Pointer < Destination'First
or else
Pointer + Result - 1 > Destination'Last
)
then
raise Layout_Error;
end if;
return Result;
end Get_Output_Field;
procedure Adjust_Output_Field
( Destination : in out String;
Pointer : in out Integer;
Index : Integer;
Out_Field : Natural;
Field : Natural;
Justify : Alignment;
Fill : Character
) is
begin
if Field = 0 then
Pointer := Index;
else
declare
Last : constant Integer := Pointer + Out_Field - 1;
begin
if Out_Field /= Index - Pointer then
case Justify is
when Left =>
for Position in Index..Last loop
Destination (Position) := Fill;
end loop;
when Center =>
declare
Length : constant Natural := Index - Pointer;
First : constant Integer :=
Pointer + (Out_Field - Length) / 2;
Next : constant Integer := First + Length;
begin
Destination (First..Next - 1) :=
Destination (Pointer..Index - 1);
for Position in Pointer..First - 1 loop
Destination (Position) := Fill;
end loop;
for Position in Next..Last loop
Destination (Position) := Fill;
end loop;
end;
when Right =>
declare
First : constant Integer :=
Last + 1 - Index + Pointer;
begin
Destination (First..Last) :=
Destination (Pointer..Index - 1);
for Position in Pointer..First - 1 loop
Destination (Position) := Fill;
end loop;
end;
end case;
end if;
Pointer := Last + 1;
end;
end if;
end Adjust_Output_Field;
end Strings_Edit.Fields;
|