323 lines
8.9 KiB
Ada
323 lines
8.9 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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-- A D A . S T R I N G S . M A P S --
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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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-- Note: parts of this code are derived from the ADAR.CSH public domain
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-- Ada 83 versions of the Appendix C string handling packages. The main
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-- differences are that we avoid the use of the minimize function which
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-- is bit-by-bit or character-by-character and therefore rather slow.
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-- Generally for character sets we favor the full 32-byte representation.
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package body Ada.Strings.Maps is
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use Ada.Characters.Latin_1;
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---------
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-- "-" --
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---------
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function "-" (Left, Right : Character_Set) return Character_Set is
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begin
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return Left and not Right;
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end "-";
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---------
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-- "=" --
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---------
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function "=" (Left, Right : Character_Set) return Boolean is
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begin
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return Character_Set_Internal (Left) = Character_Set_Internal (Right);
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end "=";
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-----------
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-- "and" --
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-----------
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function "and" (Left, Right : Character_Set) return Character_Set is
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begin
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return Character_Set
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(Character_Set_Internal (Left) and Character_Set_Internal (Right));
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end "and";
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-----------
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-- "not" --
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-----------
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function "not" (Right : Character_Set) return Character_Set is
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begin
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return Character_Set (not Character_Set_Internal (Right));
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end "not";
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----------
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-- "or" --
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----------
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function "or" (Left, Right : Character_Set) return Character_Set is
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begin
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return Character_Set
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(Character_Set_Internal (Left) or Character_Set_Internal (Right));
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end "or";
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-----------
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-- "xor" --
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-----------
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function "xor" (Left, Right : Character_Set) return Character_Set is
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begin
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return Character_Set
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(Character_Set_Internal (Left) xor Character_Set_Internal (Right));
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end "xor";
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-----------
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-- Is_In --
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-----------
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function Is_In
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(Element : Character;
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Set : Character_Set) return Boolean
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is
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begin
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return Set (Element);
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end Is_In;
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---------------
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-- Is_Subset --
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---------------
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function Is_Subset
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(Elements : Character_Set;
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Set : Character_Set) return Boolean
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is
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begin
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return (Elements and Set) = Elements;
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end Is_Subset;
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---------------
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-- To_Domain --
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---------------
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function To_Domain (Map : Character_Mapping) return Character_Sequence
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is
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Result : String (1 .. Map'Length);
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J : Natural;
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begin
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J := 0;
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for C in Map'Range loop
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if Map (C) /= C then
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J := J + 1;
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Result (J) := C;
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end if;
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end loop;
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return Result (1 .. J);
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end To_Domain;
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----------------
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-- To_Mapping --
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----------------
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function To_Mapping
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(From, To : Character_Sequence) return Character_Mapping
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is
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Result : Character_Mapping;
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Inserted : Character_Set := Null_Set;
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From_Len : constant Natural := From'Length;
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To_Len : constant Natural := To'Length;
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begin
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if From_Len /= To_Len then
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raise Strings.Translation_Error;
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end if;
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for Char in Character loop
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Result (Char) := Char;
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end loop;
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for J in From'Range loop
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if Inserted (From (J)) then
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raise Strings.Translation_Error;
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end if;
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Result (From (J)) := To (J - From'First + To'First);
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Inserted (From (J)) := True;
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end loop;
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return Result;
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end To_Mapping;
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--------------
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-- To_Range --
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--------------
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function To_Range (Map : Character_Mapping) return Character_Sequence
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is
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Result : String (1 .. Map'Length);
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J : Natural;
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begin
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J := 0;
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for C in Map'Range loop
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if Map (C) /= C then
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J := J + 1;
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Result (J) := Map (C);
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end if;
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end loop;
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return Result (1 .. J);
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end To_Range;
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---------------
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-- To_Ranges --
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---------------
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function To_Ranges (Set : Character_Set) return Character_Ranges is
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Max_Ranges : Character_Ranges (1 .. Set'Length / 2 + 1);
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Range_Num : Natural;
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C : Character;
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begin
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C := Character'First;
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Range_Num := 0;
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loop
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-- Skip gap between subsets
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while not Set (C) loop
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exit when C = Character'Last;
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C := Character'Succ (C);
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end loop;
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exit when not Set (C);
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Range_Num := Range_Num + 1;
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Max_Ranges (Range_Num).Low := C;
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-- Span a subset
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loop
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exit when not Set (C) or else C = Character'Last;
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C := Character'Succ (C);
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end loop;
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if Set (C) then
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Max_Ranges (Range_Num). High := C;
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exit;
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else
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Max_Ranges (Range_Num). High := Character'Pred (C);
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end if;
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end loop;
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return Max_Ranges (1 .. Range_Num);
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end To_Ranges;
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-----------------
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-- To_Sequence --
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-----------------
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function To_Sequence (Set : Character_Set) return Character_Sequence is
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Result : String (1 .. Character'Pos (Character'Last) + 1);
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Count : Natural := 0;
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begin
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for Char in Set'Range loop
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if Set (Char) then
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Count := Count + 1;
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Result (Count) := Char;
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end if;
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end loop;
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return Result (1 .. Count);
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end To_Sequence;
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------------
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-- To_Set --
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------------
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function To_Set (Ranges : Character_Ranges) return Character_Set is
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Result : Character_Set;
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begin
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for C in Result'Range loop
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Result (C) := False;
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end loop;
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for R in Ranges'Range loop
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for C in Ranges (R).Low .. Ranges (R).High loop
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Result (C) := True;
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end loop;
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end loop;
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return Result;
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end To_Set;
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function To_Set (Span : Character_Range) return Character_Set is
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Result : Character_Set;
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begin
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for C in Result'Range loop
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Result (C) := False;
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end loop;
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for C in Span.Low .. Span.High loop
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Result (C) := True;
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end loop;
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return Result;
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end To_Set;
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function To_Set (Sequence : Character_Sequence) return Character_Set is
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Result : Character_Set := Null_Set;
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begin
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for J in Sequence'Range loop
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Result (Sequence (J)) := True;
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end loop;
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return Result;
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end To_Set;
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function To_Set (Singleton : Character) return Character_Set is
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Result : Character_Set := Null_Set;
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begin
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Result (Singleton) := True;
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return Result;
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end To_Set;
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-----------
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-- Value --
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-----------
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function Value
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(Map : Character_Mapping;
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Element : Character) return Character
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is
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begin
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return Map (Element);
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end Value;
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end Ada.Strings.Maps;
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