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------------------------------------------------------------------------------
--                                                                          --
--                         GNAT RUN-TIME COMPONENTS                         --
--                                                                          --
--                    A D A . S T R I N G S . F I X E D                     --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 1992-2010, 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.      --
--                                                                          --
------------------------------------------------------------------------------
 
--  Note: This code is derived from the ADAR.CSH public domain Ada 83 versions
--  of the Appendix C string handling packages. One change is to avoid the use
--  of Is_In, so that we are not dependent on inlining. Note that the search
--  function implementations are to be found in the auxiliary package
--  Ada.Strings.Search. Also the Move procedure is directly incorporated (ADAR
--  used a subunit for this procedure). The number of errors having to do with
--  bounds of function return results were also fixed, and use of & removed for
--  efficiency reasons.
 
with Ada.Strings.Maps; use Ada.Strings.Maps;
with Ada.Strings.Search;
 
package body Ada.Strings.Fixed is
 
   ------------------------
   -- Search Subprograms --
   ------------------------
 
   function Index
     (Source  : String;
      Pattern : String;
      Going   : Direction := Forward;
      Mapping : Maps.Character_Mapping := Maps.Identity) return Natural
   renames Ada.Strings.Search.Index;
 
   function Index
     (Source  : String;
      Pattern : String;
      Going   : Direction := Forward;
      Mapping : Maps.Character_Mapping_Function) return Natural
   renames Ada.Strings.Search.Index;
 
   function Index
     (Source : String;
      Set    : Maps.Character_Set;
      Test   : Membership := Inside;
      Going  : Direction  := Forward) return Natural
   renames Ada.Strings.Search.Index;
 
   function Index
     (Source  : String;
      Pattern : String;
      From    : Positive;
      Going   : Direction := Forward;
      Mapping : Maps.Character_Mapping := Maps.Identity) return Natural
   renames Ada.Strings.Search.Index;
 
   function Index
     (Source  : String;
      Pattern : String;
      From    : Positive;
      Going   : Direction := Forward;
      Mapping : Maps.Character_Mapping_Function) return Natural
   renames Ada.Strings.Search.Index;
 
   function Index
     (Source  : String;
      Set     : Maps.Character_Set;
      From    : Positive;
      Test    : Membership := Inside;
      Going   : Direction := Forward) return Natural
   renames Ada.Strings.Search.Index;
 
   function Index_Non_Blank
     (Source : String;
      Going  : Direction := Forward) return Natural
   renames Ada.Strings.Search.Index_Non_Blank;
 
   function Index_Non_Blank
     (Source : String;
      From   : Positive;
      Going  : Direction := Forward) return Natural
   renames Ada.Strings.Search.Index_Non_Blank;
 
   function Count
     (Source  : String;
      Pattern : String;
      Mapping : Maps.Character_Mapping := Maps.Identity) return Natural
   renames Ada.Strings.Search.Count;
 
   function Count
     (Source  : String;
      Pattern : String;
      Mapping : Maps.Character_Mapping_Function) return Natural
   renames Ada.Strings.Search.Count;
 
   function Count
     (Source : String;
      Set    : Maps.Character_Set) return Natural
   renames Ada.Strings.Search.Count;
 
   procedure Find_Token
     (Source : String;
      Set    : Maps.Character_Set;
      From   : Positive;
      Test   : Membership;
      First  : out Positive;
      Last   : out Natural)
   renames Ada.Strings.Search.Find_Token;
 
   procedure Find_Token
     (Source : String;
      Set    : Maps.Character_Set;
      Test   : Membership;
      First  : out Positive;
      Last   : out Natural)
   renames Ada.Strings.Search.Find_Token;
 
   ---------
   -- "*" --
   ---------
 
   function "*"
     (Left  : Natural;
      Right : Character) return String
   is
      Result : String (1 .. Left);
 
   begin
      for J in Result'Range loop
         Result (J) := Right;
      end loop;
 
      return Result;
   end "*";
 
   function "*"
     (Left  : Natural;
      Right : String) return String
   is
      Result : String (1 .. Left * Right'Length);
      Ptr    : Integer := 1;
 
   begin
      for J in 1 .. Left loop
         Result (Ptr .. Ptr + Right'Length - 1) := Right;
         Ptr := Ptr + Right'Length;
      end loop;
 
      return Result;
   end "*";
 
   ------------
   -- Delete --
   ------------
 
   function Delete
     (Source  : String;
      From    : Positive;
      Through : Natural) return String
   is
   begin
      if From > Through then
         declare
            subtype Result_Type is String (1 .. Source'Length);
 
         begin
            return Result_Type (Source);
         end;
 
      elsif From not in Source'Range
        or else Through > Source'Last
      then
         raise Index_Error;
 
      else
         declare
            Front  : constant Integer := From - Source'First;
            Result : String (1 .. Source'Length - (Through - From + 1));
 
         begin
            Result (1 .. Front) :=
              Source (Source'First .. From - 1);
            Result (Front + 1 .. Result'Last) :=
              Source (Through + 1 .. Source'Last);
 
            return Result;
         end;
      end if;
   end Delete;
 
   procedure Delete
     (Source  : in out String;
      From    : Positive;
      Through : Natural;
      Justify : Alignment := Left;
      Pad     : Character := Space)
   is
   begin
      Move (Source  => Delete (Source, From, Through),
            Target  => Source,
            Justify => Justify,
            Pad     => Pad);
   end Delete;
 
   ----------
   -- Head --
   ----------
 
   function Head
     (Source : String;
      Count  : Natural;
      Pad    : Character := Space) return String
   is
      subtype Result_Type is String (1 .. Count);
 
   begin
      if Count < Source'Length then
         return
           Result_Type (Source (Source'First .. Source'First + Count - 1));
 
      else
         declare
            Result : Result_Type;
 
         begin
            Result (1 .. Source'Length) := Source;
 
            for J in Source'Length + 1 .. Count loop
               Result (J) := Pad;
            end loop;
 
            return Result;
         end;
      end if;
   end Head;
 
   procedure Head
     (Source  : in out String;
      Count   : Natural;
      Justify : Alignment := Left;
      Pad     : Character := Space)
   is
   begin
      Move (Source  => Head (Source, Count, Pad),
            Target  => Source,
            Drop    => Error,
            Justify => Justify,
            Pad     => Pad);
   end Head;
 
   ------------
   -- Insert --
   ------------
 
   function Insert
     (Source   : String;
      Before   : Positive;
      New_Item : String) return String
   is
      Result : String (1 .. Source'Length + New_Item'Length);
      Front  : constant Integer := Before - Source'First;
 
   begin
      if Before not in Source'First .. Source'Last + 1 then
         raise Index_Error;
      end if;
 
      Result (1 .. Front) :=
        Source (Source'First .. Before - 1);
      Result (Front + 1 .. Front + New_Item'Length) :=
        New_Item;
      Result (Front + New_Item'Length + 1 .. Result'Last) :=
        Source (Before .. Source'Last);
 
      return Result;
   end Insert;
 
   procedure Insert
     (Source   : in out String;
      Before   : Positive;
      New_Item : String;
      Drop     : Truncation := Error)
   is
   begin
      Move (Source => Insert (Source, Before, New_Item),
            Target => Source,
            Drop   => Drop);
   end Insert;
 
   ----------
   -- Move --
   ----------
 
   procedure Move
     (Source  : String;
      Target  : out String;
      Drop    : Truncation := Error;
      Justify : Alignment  := Left;
      Pad     : Character  := Space)
   is
      Sfirst  : constant Integer := Source'First;
      Slast   : constant Integer := Source'Last;
      Slength : constant Integer := Source'Length;
 
      Tfirst  : constant Integer := Target'First;
      Tlast   : constant Integer := Target'Last;
      Tlength : constant Integer := Target'Length;
 
      function Is_Padding (Item : String) return Boolean;
      --  Check if Item is all Pad characters, return True if so, False if not
 
      function Is_Padding (Item : String) return Boolean is
      begin
         for J in Item'Range loop
            if Item (J) /= Pad then
               return False;
            end if;
         end loop;
 
         return True;
      end Is_Padding;
 
   --  Start of processing for Move
 
   begin
      if Slength = Tlength then
         Target := Source;
 
      elsif Slength > Tlength then
 
         case Drop is
            when Left =>
               Target := Source (Slast - Tlength + 1 .. Slast);
 
            when Right =>
               Target := Source (Sfirst .. Sfirst + Tlength - 1);
 
            when Error =>
               case Justify is
                  when Left =>
                     if Is_Padding (Source (Sfirst + Tlength .. Slast)) then
                        Target :=
                          Source (Sfirst .. Sfirst + Target'Length - 1);
                     else
                        raise Length_Error;
                     end if;
 
                  when Right =>
                     if Is_Padding (Source (Sfirst .. Slast - Tlength)) then
                        Target := Source (Slast - Tlength + 1 .. Slast);
                     else
                        raise Length_Error;
                     end if;
 
                  when Center =>
                     raise Length_Error;
               end case;
 
         end case;
 
      --  Source'Length < Target'Length
 
      else
         case Justify is
            when Left =>
               Target (Tfirst .. Tfirst + Slength - 1) := Source;
 
               for I in Tfirst + Slength .. Tlast loop
                  Target (I) := Pad;
               end loop;
 
            when Right =>
               for I in Tfirst .. Tlast - Slength loop
                  Target (I) := Pad;
               end loop;
 
               Target (Tlast - Slength + 1 .. Tlast) := Source;
 
            when Center =>
               declare
                  Front_Pad   : constant Integer := (Tlength - Slength) / 2;
                  Tfirst_Fpad : constant Integer := Tfirst + Front_Pad;
 
               begin
                  for I in Tfirst .. Tfirst_Fpad - 1 loop
                     Target (I) := Pad;
                  end loop;
 
                  Target (Tfirst_Fpad .. Tfirst_Fpad + Slength - 1) := Source;
 
                  for I in Tfirst_Fpad + Slength .. Tlast loop
                     Target (I) := Pad;
                  end loop;
               end;
         end case;
      end if;
   end Move;
 
   ---------------
   -- Overwrite --
   ---------------
 
   function Overwrite
     (Source   : String;
      Position : Positive;
      New_Item : String) return String
   is
   begin
      if Position not in Source'First .. Source'Last + 1 then
         raise Index_Error;
      end if;
 
      declare
         Result_Length : constant Natural :=
                           Integer'Max
                             (Source'Length,
                              Position - Source'First + New_Item'Length);
 
         Result : String (1 .. Result_Length);
         Front  : constant Integer := Position - Source'First;
 
      begin
         Result (1 .. Front) :=
           Source (Source'First .. Position - 1);
         Result (Front + 1 .. Front + New_Item'Length) :=
           New_Item;
         Result (Front + New_Item'Length + 1 .. Result'Length) :=
           Source (Position + New_Item'Length .. Source'Last);
         return Result;
      end;
   end Overwrite;
 
   procedure Overwrite
     (Source   : in out String;
      Position : Positive;
      New_Item : String;
      Drop     : Truncation := Right)
   is
   begin
      Move (Source => Overwrite (Source, Position, New_Item),
            Target => Source,
            Drop   => Drop);
   end Overwrite;
 
   -------------------
   -- Replace_Slice --
   -------------------
 
   function Replace_Slice
     (Source : String;
      Low    : Positive;
      High   : Natural;
      By     : String) return String
   is
   begin
      if Low > Source'Last + 1 or else High < Source'First - 1 then
         raise Index_Error;
      end if;
 
      if High >= Low then
         declare
            Front_Len : constant Integer :=
                          Integer'Max (0, Low - Source'First);
            --  Length of prefix of Source copied to result
 
            Back_Len : constant Integer :=
                         Integer'Max (0, Source'Last - High);
            --  Length of suffix of Source copied to result
 
            Result_Length : constant Integer :=
                              Front_Len + By'Length + Back_Len;
            --  Length of result
 
            Result : String (1 .. Result_Length);
 
         begin
            Result (1 .. Front_Len) := Source (Source'First .. Low - 1);
            Result (Front_Len + 1 .. Front_Len + By'Length) := By;
            Result (Front_Len + By'Length + 1 .. Result'Length) :=
              Source (High + 1 .. Source'Last);
            return Result;
         end;
 
      else
         return Insert (Source, Before => Low, New_Item => By);
      end if;
   end Replace_Slice;
 
   procedure Replace_Slice
     (Source   : in out String;
      Low      : Positive;
      High     : Natural;
      By       : String;
      Drop     : Truncation := Error;
      Justify  : Alignment  := Left;
      Pad      : Character  := Space)
   is
   begin
      Move (Replace_Slice (Source, Low, High, By), Source, Drop, Justify, Pad);
   end Replace_Slice;
 
   ----------
   -- Tail --
   ----------
 
   function Tail
     (Source : String;
      Count  : Natural;
      Pad    : Character := Space) return String
   is
      subtype Result_Type is String (1 .. Count);
 
   begin
      if Count < Source'Length then
         return Result_Type (Source (Source'Last - Count + 1 .. Source'Last));
 
      --  Pad on left
 
      else
         declare
            Result : Result_Type;
 
         begin
            for J in 1 .. Count - Source'Length loop
               Result (J) := Pad;
            end loop;
 
            Result (Count - Source'Length + 1 .. Count) := Source;
            return Result;
         end;
      end if;
   end Tail;
 
   procedure Tail
     (Source  : in out String;
      Count   : Natural;
      Justify : Alignment := Left;
      Pad     : Character := Space)
   is
   begin
      Move (Source  => Tail (Source, Count, Pad),
            Target  => Source,
            Drop    => Error,
            Justify => Justify,
            Pad     => Pad);
   end Tail;
 
   ---------------
   -- Translate --
   ---------------
 
   function Translate
     (Source  : String;
      Mapping : Maps.Character_Mapping) return String
   is
      Result : String (1 .. Source'Length);
 
   begin
      for J in Source'Range loop
         Result (J - (Source'First - 1)) := Value (Mapping, Source (J));
      end loop;
 
      return Result;
   end Translate;
 
   procedure Translate
     (Source  : in out String;
      Mapping : Maps.Character_Mapping)
   is
   begin
      for J in Source'Range loop
         Source (J) := Value (Mapping, Source (J));
      end loop;
   end Translate;
 
   function Translate
     (Source  : String;
      Mapping : Maps.Character_Mapping_Function) return String
   is
      Result : String (1 .. Source'Length);
      pragma Unsuppress (Access_Check);
 
   begin
      for J in Source'Range loop
         Result (J - (Source'First - 1)) := Mapping.all (Source (J));
      end loop;
 
      return Result;
   end Translate;
 
   procedure Translate
     (Source  : in out String;
      Mapping : Maps.Character_Mapping_Function)
   is
      pragma Unsuppress (Access_Check);
   begin
      for J in Source'Range loop
         Source (J) := Mapping.all (Source (J));
      end loop;
   end Translate;
 
   ----------
   -- Trim --
   ----------
 
   function Trim
     (Source : String;
      Side   : Trim_End) return String
   is
      Low, High : Integer;
 
   begin
      Low := Index_Non_Blank (Source, Forward);
 
      --  All blanks case
 
      if Low = 0 then
         return "";
 
      --  At least one non-blank
 
      else
         High := Index_Non_Blank (Source, Backward);
 
         case Side is
            when Strings.Left =>
               declare
                  subtype Result_Type is String (1 .. Source'Last - Low + 1);
 
               begin
                  return Result_Type (Source (Low .. Source'Last));
               end;
 
            when Strings.Right =>
               declare
                  subtype Result_Type is String (1 .. High - Source'First + 1);
 
               begin
                  return Result_Type (Source (Source'First .. High));
               end;
 
            when Strings.Both =>
               declare
                  subtype Result_Type is String (1 .. High - Low + 1);
 
               begin
                  return Result_Type (Source (Low .. High));
               end;
         end case;
      end if;
   end Trim;
 
   procedure Trim
     (Source  : in out String;
      Side    : Trim_End;
      Justify : Alignment := Left;
      Pad     : Character := Space)
   is
   begin
      Move (Trim (Source, Side),
            Source,
            Justify => Justify,
            Pad => Pad);
   end Trim;
 
   function Trim
     (Source : String;
      Left   : Maps.Character_Set;
      Right  : Maps.Character_Set) return String
   is
      High, Low : Integer;
 
   begin
      Low := Index (Source, Set => Left, Test  => Outside, Going => Forward);
 
      --  Case where source comprises only characters in Left
 
      if Low = 0 then
         return "";
      end if;
 
      High :=
        Index (Source, Set => Right, Test  => Outside, Going => Backward);
 
      --  Case where source comprises only characters in Right
 
      if High = 0 then
         return "";
      end if;
 
      declare
         subtype Result_Type is String (1 .. High - Low + 1);
 
      begin
         return Result_Type (Source (Low .. High));
      end;
   end Trim;
 
   procedure Trim
     (Source  : in out String;
      Left    : Maps.Character_Set;
      Right   : Maps.Character_Set;
      Justify : Alignment := Strings.Left;
      Pad     : Character := Space)
   is
   begin
      Move (Source  => Trim (Source, Left, Right),
            Target  => Source,
            Justify => Justify,
            Pad     => Pad);
   end Trim;
 
end Ada.Strings.Fixed;