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------------------------------------------------------------------------------
--                                                                          --
--                         GNAT RUN-TIME COMPONENTS                         --
--                                                                          --
--                A D A . S T R I N G S . W I D E _ M A P S                 --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --
--                                                                          --
-- GNAT is free software;  you can  redistribute it  and/or modify it under --
-- terms of the  GNU General Public License as published  by the Free Soft- --
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
--                                                                          --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception,   --
-- version 3.1, as published by the Free Software Foundation.               --
--                                                                          --
-- You should have received a copy of the GNU General Public License and    --
-- a copy of the GCC Runtime Library Exception along with this program;     --
-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
-- <http://www.gnu.org/licenses/>.                                          --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------
 
with Ada.Unchecked_Deallocation;
 
package body Ada.Strings.Wide_Maps is
 
   ---------
   -- "-" --
   ---------
 
   function "-"
     (Left, Right : Wide_Character_Set) return Wide_Character_Set
   is
      LS : constant Wide_Character_Ranges_Access := Left.Set;
      RS : constant Wide_Character_Ranges_Access := Right.Set;
 
      Result : Wide_Character_Ranges (1 .. LS'Last + RS'Last);
      --  Each range on the right can generate at least one more range in
      --  the result, by splitting one of the left operand ranges.
 
      N  : Natural := 0;
      R  : Natural := 1;
      L  : Natural := 1;
 
      Left_Low : Wide_Character;
      --  Left_Low is lowest character of the L'th range not yet dealt with
 
   begin
      if LS'Last = 0 or else RS'Last = 0 then
         return Left;
      end if;
 
      Left_Low := LS (L).Low;
      while R <= RS'Last loop
 
         --  If next right range is below current left range, skip it
 
         if RS (R).High < Left_Low then
            R := R + 1;
 
         --  If next right range above current left range, copy remainder
         --  of the left range to the result
 
         elsif RS (R).Low > LS (L).High then
            N := N + 1;
            Result (N).Low  := Left_Low;
            Result (N).High := LS (L).High;
            L := L + 1;
            exit when L > LS'Last;
            Left_Low := LS (L).Low;
 
         else
            --  Next right range overlaps bottom of left range
 
            if RS (R).Low <= Left_Low then
 
               --  Case of right range complete overlaps left range
 
               if RS (R).High >= LS (L).High then
                  L := L + 1;
                  exit when L > LS'Last;
                  Left_Low := LS (L).Low;
 
               --  Case of right range eats lower part of left range
 
               else
                  Left_Low := Wide_Character'Succ (RS (R).High);
                  R := R + 1;
               end if;
 
            --  Next right range overlaps some of left range, but not bottom
 
            else
               N := N + 1;
               Result (N).Low  := Left_Low;
               Result (N).High := Wide_Character'Pred (RS (R).Low);
 
               --  Case of right range splits left range
 
               if RS (R).High < LS (L).High then
                  Left_Low := Wide_Character'Succ (RS (R).High);
                  R := R + 1;
 
               --  Case of right range overlaps top of left range
 
               else
                  L := L + 1;
                  exit when L > LS'Last;
                  Left_Low := LS (L).Low;
               end if;
            end if;
         end if;
      end loop;
 
      --  Copy remainder of left ranges to result
 
      if L <= LS'Last then
         N := N + 1;
         Result (N).Low  := Left_Low;
         Result (N).High := LS (L).High;
 
         loop
            L := L + 1;
            exit when L > LS'Last;
            N := N + 1;
            Result (N) := LS (L);
         end loop;
      end if;
 
      return (AF.Controlled with
              Set => new Wide_Character_Ranges'(Result (1 .. N)));
   end "-";
 
   ---------
   -- "=" --
   ---------
 
   --  The sorted, discontiguous form is canonical, so equality can be used
 
   function "=" (Left, Right : Wide_Character_Set) return Boolean is
   begin
      return Left.Set.all = Right.Set.all;
   end "=";
 
   -----------
   -- "and" --
   -----------
 
   function "and"
     (Left, Right : Wide_Character_Set) return Wide_Character_Set
   is
      LS : constant Wide_Character_Ranges_Access := Left.Set;
      RS : constant Wide_Character_Ranges_Access := Right.Set;
 
      Result : Wide_Character_Ranges (1 .. LS'Last + RS'Last);
      N      : Natural := 0;
      L, R   : Natural := 1;
 
   begin
      --  Loop to search for overlapping character ranges
 
      while L <= LS'Last and then R <= RS'Last loop
 
         if LS (L).High < RS (R).Low then
            L := L + 1;
 
         elsif RS (R).High < LS (L).Low then
            R := R + 1;
 
         --  Here we have LS (L).High >= RS (R).Low
         --           and RS (R).High >= LS (L).Low
         --  so we have an overlapping range
 
         else
            N := N + 1;
            Result (N).Low := Wide_Character'Max (LS (L).Low,  RS (R).Low);
            Result (N).High :=
              Wide_Character'Min (LS (L).High, RS (R).High);
 
            if RS (R).High = LS (L).High then
               L := L + 1;
               R := R + 1;
            elsif RS (R).High < LS (L).High then
               R := R + 1;
            else
               L := L + 1;
            end if;
         end if;
      end loop;
 
      return (AF.Controlled with
              Set       => new Wide_Character_Ranges'(Result (1 .. N)));
   end "and";
 
   -----------
   -- "not" --
   -----------
 
   function "not"
     (Right : Wide_Character_Set) return Wide_Character_Set
   is
      RS : constant Wide_Character_Ranges_Access := Right.Set;
 
      Result : Wide_Character_Ranges (1 .. RS'Last + 1);
      N      : Natural := 0;
 
   begin
      if RS'Last = 0 then
         N := 1;
         Result (1) := (Low  => Wide_Character'First,
                        High => Wide_Character'Last);
 
      else
         if RS (1).Low /= Wide_Character'First then
            N := N + 1;
            Result (N).Low  := Wide_Character'First;
            Result (N).High := Wide_Character'Pred (RS (1).Low);
         end if;
 
         for K in 1 .. RS'Last - 1 loop
            N := N + 1;
            Result (N).Low  := Wide_Character'Succ (RS (K).High);
            Result (N).High := Wide_Character'Pred (RS (K + 1).Low);
         end loop;
 
         if RS (RS'Last).High /= Wide_Character'Last then
            N := N + 1;
            Result (N).Low  := Wide_Character'Succ (RS (RS'Last).High);
            Result (N).High := Wide_Character'Last;
         end if;
      end if;
 
      return (AF.Controlled with
              Set => new Wide_Character_Ranges'(Result (1 .. N)));
   end "not";
 
   ----------
   -- "or" --
   ----------
 
   function "or"
     (Left, Right : Wide_Character_Set) return Wide_Character_Set
   is
      LS : constant Wide_Character_Ranges_Access := Left.Set;
      RS : constant Wide_Character_Ranges_Access := Right.Set;
 
      Result : Wide_Character_Ranges (1 .. LS'Last + RS'Last);
      N      : Natural;
      L, R   : Natural;
 
   begin
      N := 0;
      L := 1;
      R := 1;
 
      --  Loop through ranges in output file
 
      loop
         --  If no left ranges left, copy next right range
 
         if L > LS'Last then
            exit when R > RS'Last;
            N := N + 1;
            Result (N) := RS (R);
            R := R + 1;
 
         --  If no right ranges left, copy next left range
 
         elsif R > RS'Last then
            N := N + 1;
            Result (N) := LS (L);
            L := L + 1;
 
         else
            --  We have two ranges, choose lower one
 
            N := N + 1;
 
            if LS (L).Low <= RS (R).Low then
               Result (N) := LS (L);
               L := L + 1;
            else
               Result (N) := RS (R);
               R := R + 1;
            end if;
 
            --  Loop to collapse ranges into last range
 
            loop
               --  Collapse next length range into current result range
               --  if possible.
 
               if L <= LS'Last
                 and then LS (L).Low <= Wide_Character'Succ (Result (N).High)
               then
                  Result (N).High :=
                    Wide_Character'Max (Result (N).High, LS (L).High);
                  L := L + 1;
 
               --  Collapse next right range into current result range
               --  if possible
 
               elsif R <= RS'Last
                 and then RS (R).Low <=
                            Wide_Character'Succ (Result (N).High)
               then
                  Result (N).High :=
                    Wide_Character'Max (Result (N).High, RS (R).High);
                  R := R + 1;
 
               --  If neither range collapses, then done with this range
 
               else
                  exit;
               end if;
            end loop;
         end if;
      end loop;
 
      return (AF.Controlled with
              Set => new Wide_Character_Ranges'(Result (1 .. N)));
   end "or";
 
   -----------
   -- "xor" --
   -----------
 
   function "xor"
     (Left, Right : Wide_Character_Set) return Wide_Character_Set
   is
   begin
      return (Left or Right) - (Left and Right);
   end "xor";
 
   ------------
   -- Adjust --
   ------------
 
   procedure Adjust (Object : in out Wide_Character_Mapping) is
   begin
      Object.Map := new Wide_Character_Mapping_Values'(Object.Map.all);
   end Adjust;
 
   procedure Adjust (Object : in out Wide_Character_Set) is
   begin
      Object.Set := new Wide_Character_Ranges'(Object.Set.all);
   end Adjust;
 
   --------------
   -- Finalize --
   --------------
 
   procedure Finalize (Object : in out Wide_Character_Mapping) is
 
      procedure Free is new Ada.Unchecked_Deallocation
        (Wide_Character_Mapping_Values,
         Wide_Character_Mapping_Values_Access);
 
   begin
      if Object.Map /=  Null_Map'Unrestricted_Access then
         Free (Object.Map);
      end if;
   end Finalize;
 
   procedure Finalize (Object : in out Wide_Character_Set) is
 
      procedure Free is new Ada.Unchecked_Deallocation
        (Wide_Character_Ranges,
         Wide_Character_Ranges_Access);
 
   begin
      if Object.Set /= Null_Range'Unrestricted_Access then
         Free (Object.Set);
      end if;
   end Finalize;
 
   ----------------
   -- Initialize --
   ----------------
 
   procedure Initialize (Object : in out Wide_Character_Mapping) is
   begin
      Object := Identity;
   end Initialize;
 
   procedure Initialize (Object : in out Wide_Character_Set) is
   begin
      Object := Null_Set;
   end Initialize;
 
   -----------
   -- Is_In --
   -----------
 
   function Is_In
     (Element : Wide_Character;
      Set     : Wide_Character_Set) return Boolean
   is
      L, R, M : Natural;
      SS      : constant Wide_Character_Ranges_Access := Set.Set;
 
   begin
      L := 1;
      R := SS'Last;
 
      --  Binary search loop. The invariant is that if Element is in any of
      --  of the constituent ranges it is in one between Set (L) and Set (R).
 
      loop
         if L > R then
            return False;
 
         else
            M := (L + R) / 2;
 
            if Element > SS (M).High then
               L := M + 1;
            elsif Element < SS (M).Low then
               R := M - 1;
            else
               return True;
            end if;
         end if;
      end loop;
   end Is_In;
 
   ---------------
   -- Is_Subset --
   ---------------
 
   function Is_Subset
     (Elements : Wide_Character_Set;
      Set      : Wide_Character_Set) return Boolean
   is
      ES : constant Wide_Character_Ranges_Access := Elements.Set;
      SS : constant Wide_Character_Ranges_Access := Set.Set;
 
      S  : Positive := 1;
      E  : Positive := 1;
 
   begin
      loop
         --  If no more element ranges, done, and result is true
 
         if E > ES'Last then
            return True;
 
         --  If more element ranges, but no more set ranges, result is false
 
         elsif S > SS'Last then
            return False;
 
         --  Remove irrelevant set range
 
         elsif SS (S).High < ES (E).Low then
            S := S + 1;
 
         --  Get rid of element range that is properly covered by set
 
         elsif SS (S).Low <= ES (E).Low
            and then ES (E).High <= SS (S).High
         then
            E := E + 1;
 
         --  Otherwise we have a non-covered element range, result is false
 
         else
            return False;
         end if;
      end loop;
   end Is_Subset;
 
   ---------------
   -- To_Domain --
   ---------------
 
   function To_Domain
     (Map : Wide_Character_Mapping) return Wide_Character_Sequence
   is
   begin
      return Map.Map.Domain;
   end To_Domain;
 
   ----------------
   -- To_Mapping --
   ----------------
 
   function To_Mapping
     (From, To : Wide_Character_Sequence) return Wide_Character_Mapping
   is
      Domain : Wide_Character_Sequence (1 .. From'Length);
      Rangev : Wide_Character_Sequence (1 .. To'Length);
      N      : Natural := 0;
 
   begin
      if From'Length /= To'Length then
         raise Translation_Error;
 
      else
         pragma Warnings (Off); -- apparent uninit use of Domain
 
         for J in From'Range loop
            for M in 1 .. N loop
               if From (J) = Domain (M) then
                  raise Translation_Error;
               elsif From (J) < Domain (M) then
                  Domain (M + 1 .. N + 1) := Domain (M .. N);
                  Rangev (M + 1 .. N + 1) := Rangev (M .. N);
                  Domain (M) := From (J);
                  Rangev (M) := To   (J);
                  goto Continue;
               end if;
            end loop;
 
            Domain (N + 1) := From (J);
            Rangev (N + 1) := To   (J);
 
            <<Continue>>
               N := N + 1;
         end loop;
 
         pragma Warnings (On);
 
         return (AF.Controlled with
                 Map => new Wide_Character_Mapping_Values'(
                          Length => N,
                          Domain => Domain (1 .. N),
                          Rangev => Rangev (1 .. N)));
      end if;
   end To_Mapping;
 
   --------------
   -- To_Range --
   --------------
 
   function To_Range
     (Map : Wide_Character_Mapping) return Wide_Character_Sequence
   is
   begin
      return Map.Map.Rangev;
   end To_Range;
 
   ---------------
   -- To_Ranges --
   ---------------
 
   function To_Ranges
     (Set : Wide_Character_Set) return Wide_Character_Ranges
   is
   begin
      return Set.Set.all;
   end To_Ranges;
 
   -----------------
   -- To_Sequence --
   -----------------
 
   function To_Sequence
     (Set : Wide_Character_Set) return Wide_Character_Sequence
   is
      SS : constant Wide_Character_Ranges_Access := Set.Set;
 
      Result : Wide_String (Positive range 1 .. 2 ** 16);
      N      : Natural := 0;
 
   begin
      for J in SS'Range loop
         for K in SS (J).Low .. SS (J).High loop
            N := N + 1;
            Result (N) := K;
         end loop;
      end loop;
 
      return Result (1 .. N);
   end To_Sequence;
 
   ------------
   -- To_Set --
   ------------
 
   --  Case of multiple range input
 
   function To_Set
     (Ranges : Wide_Character_Ranges) return Wide_Character_Set
   is
      Result : Wide_Character_Ranges (Ranges'Range);
      N      : Natural := 0;
      J      : Natural;
 
   begin
      --  The output of To_Set is required to be sorted by increasing Low
      --  values, and discontiguous, so first we sort them as we enter them,
      --  using a simple insertion sort.
 
      pragma Warnings (Off);
      --  Kill bogus warning on Result being uninitialized
 
      for J in Ranges'Range loop
         for K in 1 .. N loop
            if Ranges (J).Low < Result (K).Low then
               Result (K + 1 .. N + 1) := Result (K .. N);
               Result (K) := Ranges (J);
               goto Continue;
            end if;
         end loop;
 
         Result (N + 1) := Ranges (J);
 
         <<Continue>>
            N := N + 1;
      end loop;
 
      pragma Warnings (On);
 
      --  Now collapse any contiguous or overlapping ranges
 
      J := 1;
      while J < N loop
         if Result (J).High < Result (J).Low then
            N := N - 1;
            Result (J .. N) := Result (J + 1 .. N + 1);
 
         elsif Wide_Character'Succ (Result (J).High) >= Result (J + 1).Low then
            Result (J).High :=
              Wide_Character'Max (Result (J).High, Result (J + 1).High);
 
            N := N - 1;
            Result (J + 1 .. N) := Result (J + 2 .. N + 1);
 
         else
            J := J + 1;
         end if;
      end loop;
 
      if N > 0 and then Result (N).High < Result (N).Low then
         N := N - 1;
      end if;
 
      return (AF.Controlled with
              Set => new Wide_Character_Ranges'(Result (1 .. N)));
   end To_Set;
 
   --  Case of single range input
 
   function To_Set
     (Span : Wide_Character_Range) return Wide_Character_Set
   is
   begin
      if Span.Low > Span.High then
         return Null_Set;
         --  This is safe, because there is no procedure with parameter
         --  Wide_Character_Set of mode "out" or "in out".
 
      else
         return (AF.Controlled with
                 Set => new Wide_Character_Ranges'(1 => Span));
      end if;
   end To_Set;
 
   --  Case of wide string input
 
   function To_Set
     (Sequence : Wide_Character_Sequence) return Wide_Character_Set
   is
      R : Wide_Character_Ranges (1 .. Sequence'Length);
 
   begin
      for J in R'Range loop
         R (J) := (Sequence (J), Sequence (J));
      end loop;
 
      return To_Set (R);
   end To_Set;
 
   --  Case of single wide character input
 
   function To_Set
     (Singleton : Wide_Character) return Wide_Character_Set
   is
   begin
      return
        (AF.Controlled with
         Set => new Wide_Character_Ranges'(1 => (Singleton, Singleton)));
   end To_Set;
 
   -----------
   -- Value --
   -----------
 
   function Value
     (Map     : Wide_Character_Mapping;
      Element : Wide_Character) return Wide_Character
   is
      L, R, M : Natural;
 
      MV : constant Wide_Character_Mapping_Values_Access := Map.Map;
 
   begin
      L := 1;
      R := MV.Domain'Last;
 
      --  Binary search loop
 
      loop
         --  If not found, identity
 
         if L > R then
            return Element;
 
         --  Otherwise do binary divide
 
         else
            M := (L + R) / 2;
 
            if Element < MV.Domain (M) then
               R := M - 1;
 
            elsif Element > MV.Domain (M) then
               L := M + 1;
 
            else --  Element = MV.Domain (M) then
               return MV.Rangev (M);
            end if;
         end if;
      end loop;
   end Value;
 
end Ada.Strings.Wide_Maps;

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Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [ada/] [a-stwima.adb] - Blame information for rev 706

Line No.	Rev	Author	Line
1	706	jeremybenn	`------------------------------------------------------------------------------`
2			`-- --`
3			`-- GNAT RUN-TIME COMPONENTS --`
4			`-- --`
5			`-- A D A . S T R I N G S . W I D E _ M A P S --`
6			`-- --`
7			`-- B o d y --`
8			`-- --`
9			`-- Copyright (C) 1992-2009, Free Software Foundation, Inc. --`
10			`-- --`
11			`-- GNAT is free software; you can redistribute it and/or modify it under --`
12			`-- terms of the GNU General Public License as published by the Free Soft- --`
13			`-- ware Foundation; either version 3, or (at your option) any later ver- --`
14			`-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --`
15			`-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --`
16			`-- or FITNESS FOR A PARTICULAR PURPOSE. --`
17			`-- --`
18			`-- As a special exception under Section 7 of GPL version 3, you are granted --`
19			`-- additional permissions described in the GCC Runtime Library Exception, --`
20			`-- version 3.1, as published by the Free Software Foundation. --`
21			`-- --`
22			`-- You should have received a copy of the GNU General Public License and --`
23			`-- a copy of the GCC Runtime Library Exception along with this program; --`
24			`-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --`
25			`-- <http://www.gnu.org/licenses/>. --`
26			`-- --`
27			`-- GNAT was originally developed by the GNAT team at New York University. --`
28			`-- Extensive contributions were provided by Ada Core Technologies Inc. --`
29			`-- --`
30			`------------------------------------------------------------------------------`
31
32			`with Ada.Unchecked_Deallocation;`
33
34			`package body Ada.Strings.Wide_Maps is`
35
36			`---------`
37			`-- "-" --`
38			`---------`
39
40			`function "-"`
41			`(Left, Right : Wide_Character_Set) return Wide_Character_Set`
42			`is`
43			`LS : constant Wide_Character_Ranges_Access := Left.Set;`
44			`RS : constant Wide_Character_Ranges_Access := Right.Set;`
45
46			`Result : Wide_Character_Ranges (1 .. LS'Last + RS'Last);`
47			`-- Each range on the right can generate at least one more range in`
48			`-- the result, by splitting one of the left operand ranges.`
49
50			`N : Natural := 0;`
51			`R : Natural := 1;`
52			`L : Natural := 1;`
53
54			`Left_Low : Wide_Character;`
55			`-- Left_Low is lowest character of the L'th range not yet dealt with`
56
57			`begin`
58			`if LS'Last = 0 or else RS'Last = 0 then`
59			`return Left;`
60			`end if;`
61
62			`Left_Low := LS (L).Low;`
63			`while R <= RS'Last loop`
64
65			`-- If next right range is below current left range, skip it`
66
67			`if RS (R).High < Left_Low then`
68			`R := R + 1;`
69
70			`-- If next right range above current left range, copy remainder`
71			`-- of the left range to the result`
72
73			`elsif RS (R).Low > LS (L).High then`
74			`N := N + 1;`
75			`Result (N).Low := Left_Low;`
76			`Result (N).High := LS (L).High;`
77			`L := L + 1;`
78			`exit when L > LS'Last;`
79			`Left_Low := LS (L).Low;`
80
81			`else`
82			`-- Next right range overlaps bottom of left range`
83
84			`if RS (R).Low <= Left_Low then`
85
86			`-- Case of right range complete overlaps left range`
87
88			`if RS (R).High >= LS (L).High then`
89			`L := L + 1;`
90			`exit when L > LS'Last;`
91			`Left_Low := LS (L).Low;`
92
93			`-- Case of right range eats lower part of left range`
94
95			`else`
96			`Left_Low := Wide_Character'Succ (RS (R).High);`
97			`R := R + 1;`
98			`end if;`
99
100			`-- Next right range overlaps some of left range, but not bottom`
101
102			`else`
103			`N := N + 1;`
104			`Result (N).Low := Left_Low;`
105			`Result (N).High := Wide_Character'Pred (RS (R).Low);`
106
107			`-- Case of right range splits left range`
108
109			`if RS (R).High < LS (L).High then`
110			`Left_Low := Wide_Character'Succ (RS (R).High);`
111			`R := R + 1;`
112
113			`-- Case of right range overlaps top of left range`
114
115			`else`
116			`L := L + 1;`
117			`exit when L > LS'Last;`
118			`Left_Low := LS (L).Low;`
119			`end if;`
120			`end if;`
121			`end if;`
122			`end loop;`
123
124			`-- Copy remainder of left ranges to result`
125
126			`if L <= LS'Last then`
127			`N := N + 1;`
128			`Result (N).Low := Left_Low;`
129			`Result (N).High := LS (L).High;`
130
131			`loop`
132			`L := L + 1;`
133			`exit when L > LS'Last;`
134			`N := N + 1;`
135			`Result (N) := LS (L);`
136			`end loop;`
137			`end if;`
138
139			`return (AF.Controlled with`
140			`Set => new Wide_Character_Ranges'(Result (1 .. N)));`
141			`end "-";`
142
143			`---------`
144			`-- "=" --`
145			`---------`
146
147			`-- The sorted, discontiguous form is canonical, so equality can be used`
148
149			`function "=" (Left, Right : Wide_Character_Set) return Boolean is`
150			`begin`
151			`return Left.Set.all = Right.Set.all;`
152			`end "=";`
153
154			`-----------`
155			`-- "and" --`
156			`-----------`
157
158			`function "and"`
159			`(Left, Right : Wide_Character_Set) return Wide_Character_Set`
160			`is`
161			`LS : constant Wide_Character_Ranges_Access := Left.Set;`
162			`RS : constant Wide_Character_Ranges_Access := Right.Set;`
163
164			`Result : Wide_Character_Ranges (1 .. LS'Last + RS'Last);`
165			`N : Natural := 0;`
166			`L, R : Natural := 1;`
167
168			`begin`
169			`-- Loop to search for overlapping character ranges`
170
171			`while L <= LS'Last and then R <= RS'Last loop`
172
173			`if LS (L).High < RS (R).Low then`
174			`L := L + 1;`
175
176			`elsif RS (R).High < LS (L).Low then`
177			`R := R + 1;`
178
179			`-- Here we have LS (L).High >= RS (R).Low`
180			`-- and RS (R).High >= LS (L).Low`
181			`-- so we have an overlapping range`
182
183			`else`
184			`N := N + 1;`
185			`Result (N).Low := Wide_Character'Max (LS (L).Low, RS (R).Low);`
186			`Result (N).High :=`
187			`Wide_Character'Min (LS (L).High, RS (R).High);`
188
189			`if RS (R).High = LS (L).High then`
190			`L := L + 1;`
191			`R := R + 1;`
192			`elsif RS (R).High < LS (L).High then`
193			`R := R + 1;`
194			`else`
195			`L := L + 1;`
196			`end if;`
197			`end if;`
198			`end loop;`
199
200			`return (AF.Controlled with`
201			`Set => new Wide_Character_Ranges'(Result (1 .. N)));`
202			`end "and";`
203
204			`-----------`
205			`-- "not" --`
206			`-----------`
207
208			`function "not"`
209			`(Right : Wide_Character_Set) return Wide_Character_Set`
210			`is`
211			`RS : constant Wide_Character_Ranges_Access := Right.Set;`
212
213			`Result : Wide_Character_Ranges (1 .. RS'Last + 1);`
214			`N : Natural := 0;`
215
216			`begin`
217			`if RS'Last = 0 then`
218			`N := 1;`
219			`Result (1) := (Low => Wide_Character'First,`
220			`High => Wide_Character'Last);`
221
222			`else`
223			`if RS (1).Low /= Wide_Character'First then`
224			`N := N + 1;`
225			`Result (N).Low := Wide_Character'First;`
226			`Result (N).High := Wide_Character'Pred (RS (1).Low);`
227			`end if;`
228
229			`for K in 1 .. RS'Last - 1 loop`
230			`N := N + 1;`
231			`Result (N).Low := Wide_Character'Succ (RS (K).High);`
232			`Result (N).High := Wide_Character'Pred (RS (K + 1).Low);`
233			`end loop;`
234
235			`if RS (RS'Last).High /= Wide_Character'Last then`
236			`N := N + 1;`
237			`Result (N).Low := Wide_Character'Succ (RS (RS'Last).High);`
238			`Result (N).High := Wide_Character'Last;`
239			`end if;`
240			`end if;`
241
242			`return (AF.Controlled with`
243			`Set => new Wide_Character_Ranges'(Result (1 .. N)));`
244			`end "not";`
245
246			`----------`
247			`-- "or" --`
248			`----------`
249
250			`function "or"`
251			`(Left, Right : Wide_Character_Set) return Wide_Character_Set`
252			`is`
253			`LS : constant Wide_Character_Ranges_Access := Left.Set;`
254			`RS : constant Wide_Character_Ranges_Access := Right.Set;`
255
256			`Result : Wide_Character_Ranges (1 .. LS'Last + RS'Last);`
257			`N : Natural;`
258			`L, R : Natural;`
259
260			`begin`
261			`N := 0;`
262			`L := 1;`
263			`R := 1;`
264
265			`-- Loop through ranges in output file`
266
267			`loop`
268			`-- If no left ranges left, copy next right range`
269
270			`if L > LS'Last then`
271			`exit when R > RS'Last;`
272			`N := N + 1;`
273			`Result (N) := RS (R);`
274			`R := R + 1;`
275
276			`-- If no right ranges left, copy next left range`
277
278			`elsif R > RS'Last then`
279			`N := N + 1;`
280			`Result (N) := LS (L);`
281			`L := L + 1;`
282
283			`else`
284			`-- We have two ranges, choose lower one`
285
286			`N := N + 1;`
287
288			`if LS (L).Low <= RS (R).Low then`
289			`Result (N) := LS (L);`
290			`L := L + 1;`
291			`else`
292			`Result (N) := RS (R);`
293			`R := R + 1;`
294			`end if;`
295
296			`-- Loop to collapse ranges into last range`
297
298			`loop`
299			`-- Collapse next length range into current result range`
300			`-- if possible.`
301
302			`if L <= LS'Last`
303			`and then LS (L).Low <= Wide_Character'Succ (Result (N).High)`
304			`then`
305			`Result (N).High :=`
306			`Wide_Character'Max (Result (N).High, LS (L).High);`
307			`L := L + 1;`
308
309			`-- Collapse next right range into current result range`
310			`-- if possible`
311
312			`elsif R <= RS'Last`
313			`and then RS (R).Low <=`
314			`Wide_Character'Succ (Result (N).High)`
315			`then`
316			`Result (N).High :=`
317			`Wide_Character'Max (Result (N).High, RS (R).High);`
318			`R := R + 1;`
319
320			`-- If neither range collapses, then done with this range`
321
322			`else`
323			`exit;`
324			`end if;`
325			`end loop;`
326			`end if;`
327			`end loop;`
328
329			`return (AF.Controlled with`
330			`Set => new Wide_Character_Ranges'(Result (1 .. N)));`
331			`end "or";`
332
333			`-----------`
334			`-- "xor" --`
335			`-----------`
336
337			`function "xor"`
338			`(Left, Right : Wide_Character_Set) return Wide_Character_Set`
339			`is`
340			`begin`
341			`return (Left or Right) - (Left and Right);`
342			`end "xor";`
343
344			`------------`
345			`-- Adjust --`
346			`------------`
347
348			`procedure Adjust (Object : in out Wide_Character_Mapping) is`
349			`begin`
350			`Object.Map := new Wide_Character_Mapping_Values'(Object.Map.all);`
351			`end Adjust;`
352
353			`procedure Adjust (Object : in out Wide_Character_Set) is`
354			`begin`
355			`Object.Set := new Wide_Character_Ranges'(Object.Set.all);`
356			`end Adjust;`
357
358			`--------------`
359			`-- Finalize --`
360			`--------------`
361
362			`procedure Finalize (Object : in out Wide_Character_Mapping) is`
363
364			`procedure Free is new Ada.Unchecked_Deallocation`
365			`(Wide_Character_Mapping_Values,`
366			`Wide_Character_Mapping_Values_Access);`
367
368			`begin`
369			`if Object.Map /= Null_Map'Unrestricted_Access then`
370			`Free (Object.Map);`
371			`end if;`
372			`end Finalize;`
373
374			`procedure Finalize (Object : in out Wide_Character_Set) is`
375
376			`procedure Free is new Ada.Unchecked_Deallocation`
377			`(Wide_Character_Ranges,`
378			`Wide_Character_Ranges_Access);`
379
380			`begin`
381			`if Object.Set /= Null_Range'Unrestricted_Access then`
382			`Free (Object.Set);`
383			`end if;`
384			`end Finalize;`
385
386			`----------------`
387			`-- Initialize --`
388			`----------------`
389
390			`procedure Initialize (Object : in out Wide_Character_Mapping) is`
391			`begin`
392			`Object := Identity;`
393			`end Initialize;`
394
395			`procedure Initialize (Object : in out Wide_Character_Set) is`
396			`begin`
397			`Object := Null_Set;`
398			`end Initialize;`
399
400			`-----------`
401			`-- Is_In --`
402			`-----------`
403
404			`function Is_In`
405			`(Element : Wide_Character;`
406			`Set : Wide_Character_Set) return Boolean`
407			`is`
408			`L, R, M : Natural;`
409			`SS : constant Wide_Character_Ranges_Access := Set.Set;`
410
411			`begin`
412			`L := 1;`
413			`R := SS'Last;`
414
415			`-- Binary search loop. The invariant is that if Element is in any of`
416			`-- of the constituent ranges it is in one between Set (L) and Set (R).`
417
418			`loop`
419			`if L > R then`
420			`return False;`
421
422			`else`
423			`M := (L + R) / 2;`
424
425			`if Element > SS (M).High then`
426			`L := M + 1;`
427			`elsif Element < SS (M).Low then`
428			`R := M - 1;`
429			`else`
430			`return True;`
431			`end if;`
432			`end if;`
433			`end loop;`
434			`end Is_In;`
435
436			`---------------`
437			`-- Is_Subset --`
438			`---------------`
439
440			`function Is_Subset`
441			`(Elements : Wide_Character_Set;`
442			`Set : Wide_Character_Set) return Boolean`
443			`is`
444			`ES : constant Wide_Character_Ranges_Access := Elements.Set;`
445			`SS : constant Wide_Character_Ranges_Access := Set.Set;`
446
447			`S : Positive := 1;`
448			`E : Positive := 1;`
449
450			`begin`
451			`loop`
452			`-- If no more element ranges, done, and result is true`
453
454			`if E > ES'Last then`
455			`return True;`
456
457			`-- If more element ranges, but no more set ranges, result is false`
458
459			`elsif S > SS'Last then`
460			`return False;`
461
462			`-- Remove irrelevant set range`
463
464			`elsif SS (S).High < ES (E).Low then`
465			`S := S + 1;`
466
467			`-- Get rid of element range that is properly covered by set`
468
469			`elsif SS (S).Low <= ES (E).Low`
470			`and then ES (E).High <= SS (S).High`
471			`then`
472			`E := E + 1;`
473
474			`-- Otherwise we have a non-covered element range, result is false`
475
476			`else`
477			`return False;`
478			`end if;`
479			`end loop;`
480			`end Is_Subset;`
481
482			`---------------`
483			`-- To_Domain --`
484			`---------------`
485
486			`function To_Domain`
487			`(Map : Wide_Character_Mapping) return Wide_Character_Sequence`
488			`is`
489			`begin`
490			`return Map.Map.Domain;`
491			`end To_Domain;`
492
493			`----------------`
494			`-- To_Mapping --`
495			`----------------`
496
497			`function To_Mapping`
498			`(From, To : Wide_Character_Sequence) return Wide_Character_Mapping`
499			`is`
500			`Domain : Wide_Character_Sequence (1 .. From'Length);`
501			`Rangev : Wide_Character_Sequence (1 .. To'Length);`
502			`N : Natural := 0;`
503
504			`begin`
505			`if From'Length /= To'Length then`
506			`raise Translation_Error;`
507
508			`else`
509			`pragma Warnings (Off); -- apparent uninit use of Domain`
510
511			`for J in From'Range loop`
512			`for M in 1 .. N loop`
513			`if From (J) = Domain (M) then`
514			`raise Translation_Error;`
515			`elsif From (J) < Domain (M) then`
516			`Domain (M + 1 .. N + 1) := Domain (M .. N);`
517			`Rangev (M + 1 .. N + 1) := Rangev (M .. N);`
518			`Domain (M) := From (J);`
519			`Rangev (M) := To (J);`
520			`goto Continue;`
521			`end if;`
522			`end loop;`
523
524			`Domain (N + 1) := From (J);`
525			`Rangev (N + 1) := To (J);`
526
527			`<<Continue>>`
528			`N := N + 1;`
529			`end loop;`
530
531			`pragma Warnings (On);`
532
533			`return (AF.Controlled with`
534			`Map => new Wide_Character_Mapping_Values'(`
535			`Length => N,`
536			`Domain => Domain (1 .. N),`
537			`Rangev => Rangev (1 .. N)));`
538			`end if;`
539			`end To_Mapping;`
540
541			`--------------`
542			`-- To_Range --`
543			`--------------`
544
545			`function To_Range`
546			`(Map : Wide_Character_Mapping) return Wide_Character_Sequence`
547			`is`
548			`begin`
549			`return Map.Map.Rangev;`
550			`end To_Range;`
551
552			`---------------`
553			`-- To_Ranges --`
554			`---------------`
555
556			`function To_Ranges`
557			`(Set : Wide_Character_Set) return Wide_Character_Ranges`
558			`is`
559			`begin`
560			`return Set.Set.all;`
561			`end To_Ranges;`
562
563			`-----------------`
564			`-- To_Sequence --`
565			`-----------------`
566
567			`function To_Sequence`
568			`(Set : Wide_Character_Set) return Wide_Character_Sequence`
569			`is`
570			`SS : constant Wide_Character_Ranges_Access := Set.Set;`
571
572			`Result : Wide_String (Positive range 1 .. 2 ** 16);`
573			`N : Natural := 0;`
574
575			`begin`
576			`for J in SS'Range loop`
577			`for K in SS (J).Low .. SS (J).High loop`
578			`N := N + 1;`
579			`Result (N) := K;`
580			`end loop;`
581			`end loop;`
582
583			`return Result (1 .. N);`
584			`end To_Sequence;`
585
586			`------------`
587			`-- To_Set --`
588			`------------`
589
590			`-- Case of multiple range input`
591
592			`function To_Set`
593			`(Ranges : Wide_Character_Ranges) return Wide_Character_Set`
594			`is`
595			`Result : Wide_Character_Ranges (Ranges'Range);`
596			`N : Natural := 0;`
597			`J : Natural;`
598
599			`begin`
600			`-- The output of To_Set is required to be sorted by increasing Low`
601			`-- values, and discontiguous, so first we sort them as we enter them,`
602			`-- using a simple insertion sort.`
603
604			`pragma Warnings (Off);`
605			`-- Kill bogus warning on Result being uninitialized`
606
607			`for J in Ranges'Range loop`
608			`for K in 1 .. N loop`
609			`if Ranges (J).Low < Result (K).Low then`
610			`Result (K + 1 .. N + 1) := Result (K .. N);`
611			`Result (K) := Ranges (J);`
612			`goto Continue;`
613			`end if;`
614			`end loop;`
615
616			`Result (N + 1) := Ranges (J);`
617
618			`<<Continue>>`
619			`N := N + 1;`
620			`end loop;`
621
622			`pragma Warnings (On);`
623
624			`-- Now collapse any contiguous or overlapping ranges`
625
626			`J := 1;`
627			`while J < N loop`
628			`if Result (J).High < Result (J).Low then`
629			`N := N - 1;`
630			`Result (J .. N) := Result (J + 1 .. N + 1);`
631
632			`elsif Wide_Character'Succ (Result (J).High) >= Result (J + 1).Low then`
633			`Result (J).High :=`
634			`Wide_Character'Max (Result (J).High, Result (J + 1).High);`
635
636			`N := N - 1;`
637			`Result (J + 1 .. N) := Result (J + 2 .. N + 1);`
638
639			`else`
640			`J := J + 1;`
641			`end if;`
642			`end loop;`
643
644			`if N > 0 and then Result (N).High < Result (N).Low then`
645			`N := N - 1;`
646			`end if;`
647
648			`return (AF.Controlled with`
649			`Set => new Wide_Character_Ranges'(Result (1 .. N)));`
650			`end To_Set;`
651
652			`-- Case of single range input`
653
654			`function To_Set`
655			`(Span : Wide_Character_Range) return Wide_Character_Set`
656			`is`
657			`begin`
658			`if Span.Low > Span.High then`
659			`return Null_Set;`
660			`-- This is safe, because there is no procedure with parameter`
661			`-- Wide_Character_Set of mode "out" or "in out".`
662
663			`else`
664			`return (AF.Controlled with`
665			`Set => new Wide_Character_Ranges'(1 => Span));`
666			`end if;`
667			`end To_Set;`
668
669			`-- Case of wide string input`
670
671			`function To_Set`
672			`(Sequence : Wide_Character_Sequence) return Wide_Character_Set`
673			`is`
674			`R : Wide_Character_Ranges (1 .. Sequence'Length);`
675
676			`begin`
677			`for J in R'Range loop`
678			`R (J) := (Sequence (J), Sequence (J));`
679			`end loop;`
680
681			`return To_Set (R);`
682			`end To_Set;`
683
684			`-- Case of single wide character input`
685
686			`function To_Set`
687			`(Singleton : Wide_Character) return Wide_Character_Set`
688			`is`
689			`begin`
690			`return`
691			`(AF.Controlled with`
692			`Set => new Wide_Character_Ranges'(1 => (Singleton, Singleton)));`
693			`end To_Set;`
694
695			`-----------`
696			`-- Value --`
697			`-----------`
698
699			`function Value`
700			`(Map : Wide_Character_Mapping;`
701			`Element : Wide_Character) return Wide_Character`
702			`is`
703			`L, R, M : Natural;`
704
705			`MV : constant Wide_Character_Mapping_Values_Access := Map.Map;`
706
707			`begin`
708			`L := 1;`
709			`R := MV.Domain'Last;`
710
711			`-- Binary search loop`
712
713			`loop`
714			`-- If not found, identity`
715
716			`if L > R then`
717			`return Element;`
718
719			`-- Otherwise do binary divide`
720
721			`else`
722			`M := (L + R) / 2;`
723
724			`if Element < MV.Domain (M) then`
725			`R := M - 1;`
726
727			`elsif Element > MV.Domain (M) then`
728			`L := M + 1;`
729
730			`else -- Element = MV.Domain (M) then`
731			`return MV.Rangev (M);`
732			`end if;`
733			`end if;`
734			`end loop;`
735			`end Value;`
736
737			`end Ada.Strings.Wide_Maps;`