131 lines
5.1 KiB
Ada
131 lines
5.1 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- S Y S T E M . W W D _ W C H A R --
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-- --
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-- B o d y --
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-- --
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-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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with Interfaces; use Interfaces;
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with System.WWd_Char;
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package body System.Wwd_WChar is
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------------------------------------
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-- Wide_Wide_Width_Wide_Character --
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------------------------------------
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-- This is the case where we are talking about the Wide_Wide_Image of
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-- a Wide_Character, which is always the same character sequence as the
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-- Wide_Image of the same Wide_Character.
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function Wide_Wide_Width_Wide_Character
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(Lo, Hi : Wide_Character) return Natural
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is
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begin
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return Wide_Width_Wide_Character (Lo, Hi);
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end Wide_Wide_Width_Wide_Character;
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------------------------------------
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-- Wide_Wide_Width_Wide_Wide_Char --
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------------------------------------
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function Wide_Wide_Width_Wide_Wide_Char
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(Lo, Hi : Wide_Wide_Character) return Natural
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is
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LV : constant Unsigned_32 := Wide_Wide_Character'Pos (Lo);
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HV : constant Unsigned_32 := Wide_Wide_Character'Pos (Hi);
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begin
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-- Return zero if empty range
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if LV > HV then
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return 0;
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-- Return max value (12) for wide character (Hex_hhhhhhhh)
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elsif HV > 255 then
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return 12;
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-- If any characters in normal character range, then use normal
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-- Wide_Wide_Width attribute on this range to find out a starting point.
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-- Otherwise start with zero.
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else
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return
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System.WWd_Char.Wide_Wide_Width_Character
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(Lo => Character'Val (LV),
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Hi => Character'Val (Unsigned_32'Min (255, HV)));
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end if;
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end Wide_Wide_Width_Wide_Wide_Char;
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-------------------------------
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-- Wide_Width_Wide_Character --
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-------------------------------
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function Wide_Width_Wide_Character
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(Lo, Hi : Wide_Character) return Natural
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is
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LV : constant Unsigned_32 := Wide_Character'Pos (Lo);
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HV : constant Unsigned_32 := Wide_Character'Pos (Hi);
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begin
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-- Return zero if empty range
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if LV > HV then
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return 0;
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-- Return max value (12) for wide character (Hex_hhhhhhhh)
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elsif HV > 255 then
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return 12;
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-- If any characters in normal character range, then use normal
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-- Wide_Wide_Width attribute on this range to find out a starting point.
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-- Otherwise start with zero.
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else
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return
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System.WWd_Char.Wide_Width_Character
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(Lo => Character'Val (LV),
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Hi => Character'Val (Unsigned_32'Min (255, HV)));
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end if;
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end Wide_Width_Wide_Character;
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------------------------------------
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-- Wide_Width_Wide_Wide_Character --
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------------------------------------
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function Wide_Width_Wide_Wide_Character
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(Lo, Hi : Wide_Wide_Character) return Natural
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is
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begin
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return Wide_Wide_Width_Wide_Wide_Char (Lo, Hi);
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end Wide_Width_Wide_Wide_Character;
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end System.Wwd_WChar;
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