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Wrap

Text File | 1995-10-17 | 8.5 KB | 330 lines

------------------------------------------------------------------------------ -- -- -- GNAT RUNTIME COMPONENTS -- -- -- -- A D A . S T R I N G S . M A P S -- -- -- -- B o d y -- -- -- -- $Revision: 1.14 $ -- -- -- -- Copyright (c) 1992,1993,1994,1995 NYU, All Rights Reserved -- -- -- -- The GNAT library is free software; you can redistribute it and/or modify -- -- it under terms of the GNU Library General Public License as published by -- -- the Free Software Foundation; either version 2, or (at your option) any -- -- later version. The GNAT 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 -- -- Library General Public License for more details. You should have -- -- received a copy of the GNU Library General Public License along with -- -- the GNAT library; see the file COPYING.LIB. If not, write to the Free -- -- Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. -- -- -- ------------------------------------------------------------------------------ -- Note: parts of this code are derived from the ADAR.CSH public domain -- Ada 83 versions of the Appendix C string handling packages. The main -- differences are that we avoid the use of the minimize function which -- is bit-by-bit or character-by-character and therefore rather slow. -- Generally for character sets we favor the full 32-byte representation. package body Ada.Strings.Maps is --------- -- "=" -- --------- function "=" (Left, Right : in Character_Set) return Boolean is begin return Character_Set_Internal (Left) = Character_Set_Internal (Right); end "="; ----------- -- "and" -- ----------- function "and" (Left, Right : in Character_Set) return Character_Set is begin return Character_Set (Character_Set_Internal (Left) and Character_Set_Internal (Right)); end "and"; ----------- -- "not" -- ----------- function "not" (Right : in Character_Set) return Character_Set is begin return Character_Set (not Character_Set_Internal (Right)); end "not"; ---------- -- "or" -- ---------- function "or" (Left, Right : in Character_Set) return Character_Set is begin return Character_Set (Character_Set_Internal (Left) or Character_Set_Internal (Right)); end "or"; ----------- -- "xor" -- ----------- function "xor" (Left, Right : in Character_Set) return Character_Set is begin return Character_Set (Character_Set_Internal (Left) xor Character_Set_Internal (Right)); end "xor"; ------------ -- To_Set -- ------------ function To_Set (Ranges : in Character_Ranges) return Character_Set is Result : Character_Set; begin for C in Result'Range loop Result (C) := False; end loop; for R in Ranges'Range loop for C in Ranges (R).Low .. Ranges (R).High loop Result (C) := True; end loop; end loop; return Result; end To_Set; function To_Set (Span : in Character_Range) return Character_Set is Result : Character_Set; begin for C in Result'Range loop Result (C) := False; end loop; for C in Span.Low .. Span.High loop Result (C) := True; end loop; return Result; end To_Set; --------------- -- To_Ranges -- --------------- function To_Ranges (Set : in Character_Set) return Character_Ranges is Max_Ranges : Character_Ranges (1 .. Set'Length / 2 + 1); Range_Num : Natural; C : Character; begin C := Character'First; Range_Num := 0; loop -- Skip gap between subsets. while not Set (C) loop exit when C = Character'Last; C := Character'Succ (C); end loop; exit when not Set (C); Range_Num := Range_Num + 1; Max_Ranges (Range_Num).Low := C; -- Span a subset. loop exit when not Set (C) or else C = Character'Last; C := Character' Succ (C); end loop; if Set (C) then Max_Ranges (Range_Num). High := C; exit; else Max_Ranges (Range_Num). High := Character'Pred (C); end if; end loop; return Max_Ranges (1 .. Range_Num); end To_Ranges; --------- -- "-" -- --------- function "-" (Left, Right : Character_Set) return Character_Set is begin return Left and not Right; end "-"; ----------- -- Is_In -- ----------- function Is_In (Element : Character; Set : Character_Set) return Boolean is begin return Set (Element); end Is_In; --------------- -- Is_Subset -- --------------- function Is_Subset (Elements : Character_Set; Set : Character_Set) return Boolean is begin return (Elements and Set) = Elements; end Is_Subset; ---------------- -- To_Mapping -- ---------------- function To_Mapping (From, To : in Character_Sequence) return Character_Mapping is Result : Character_Mapping; Inserted : Character_Set := Null_Set; From_Len : constant Natural := From'Length; To_Len : constant Natural := To'Length; begin if From_Len /= To_Len then raise Strings.Translation_Error; end if; for Char in Character loop Result (Char) := Char; end loop; for J in From'Range loop if Inserted (From (J)) then raise Strings.Translation_Error; end if; Result (From (J)) := To (J - From'First + To'First); Inserted (From (J)) := True; end loop; return Result; end To_Mapping; ----------------- -- To_Sequence -- ----------------- function To_Sequence (Set : Character_Set) return Character_Sequence is Result : String (1 .. Character'Pos (Character'Last)); Count : Natural := 0; begin for Char in Set'Range loop if Set (Char) then Count := Count + 1; Result (Count) := Char; end if; end loop; return Result (1 .. Count); end To_Sequence; ------------ -- To_Set -- ------------ function To_Set (Sequence : Character_Sequence) return Character_Set is Result : Character_Set := Null_Set; begin for J in Sequence'Range loop Result (Sequence (J)) := True; end loop; return Result; end To_Set; function To_Set (Singleton : Character) return Character_Set is Result : Character_Set := Null_Set; begin Result (Singleton) := True; return Result; end To_Set; ----------- -- Value -- ----------- function Value (Map : in Character_Mapping; Element : in Character) return Character is begin return Map (Element); end Value; --------------- -- To_Domain -- --------------- function To_Domain (Map : in Character_Mapping) return Character_Sequence is Result : String (1 .. Map'Length); J : Natural; begin J := 1; for C in Map'Range loop if Map (C) /= C then Result (J) := C; J := J + 1; end if; end loop; return Result (1 .. J); end To_Domain; -------------- -- To_Range -- -------------- function To_Range (Map : in Character_Mapping) return Character_Sequence is Result : String (1 .. Map'Length); J : Natural; begin J := 0; for C in Map'Range loop if Map (C) /= C then Result (J) := Map (C); J := J + 1; end if; end loop; return Result (1 .. J); end To_Range; end Ada.Strings.Maps;