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134 | -- PragmAda Reusable Component (PragmARC)
-- Copyright (C) 2020 by PragmAda Software Engineering. All rights reserved.
-- **************************************************************************
--
-- History:
-- 2020 Jun 01 J. Carter V1.2--Use existing Too_Short exception rather than a local exception
-- 2016 Jul 01 J. Carter V1.1--Made type B_String tagged and non-limited
-- 2015 Nov 15 J. Carter V1.0--Initial release
--
package body PragmARC.B_Strings is
function To_String (Source : B_String) return String is
-- Empty declarative part
begin -- To_String
return Source.Value (1 .. Source.Length);
end To_String;
function To_B_String (Source : String) return B_String is
Max_Length : constant Positive := Integer'Max (1, Source'Length);
Length : constant Natural := Source'Length;
begin -- To_B_String
return (Max_Length => Max_Length, Len => Length, Value => Source & (Length + 1 .. Max_Length => ' ') );
end To_B_String;
function Length (Source : B_String) return Natural is
-- Empty declarative part
begin -- Length
return Source.Len;
end Length;
procedure Assign (To : in out B_String; From : in B_String; Drop : in Ada.Strings.Truncation := Ada.Strings.Error) is
use type Ada.Strings.Truncation;
begin -- Assign
if From.Len <= To.Max_Length then
To.Len := From.Len;
To.Value (1 .. To.Len) := From.Value (1 .. To.Len);
return;
end if;
-- From.Len > To.Max_Length
if Drop = Ada.Strings.Error then
raise Too_Short;
end if;
To.Len := To.Max_Length;
if Drop = Ada.Strings.Left then
To.Value := From.Value (From.Len - To.Len + 1 .. From.Len);
return;
end if;
-- Drop = Right
To.Value := From.Value (1 .. To.Len);
end Assign;
procedure Assign (To : in out B_String; From : in String; Drop : in Ada.Strings.Truncation := Ada.Strings.Error) is
use type Ada.Strings.Truncation;
begin -- Assign
if From'Length <= To.Max_Length then
To.Len := From'Length;
To.Value (1 .. To.Len) := From;
return;
end if;
-- From'Length > To.Max_Length
if Drop = Ada.Strings.Error then
raise Too_Short;
end if;
To.Len := To.Max_Length;
if Drop = Ada.Strings.Left then
To.Value := From (From'Last - To.Len + 1 .. From'Last);
return;
end if;
-- Drop = Right
To.Value := From (From'First .. From'First + To.Len - 1);
end Assign;
function "=" (Left : B_String; Right : B_String) return Boolean is
-- Empty declarative part
begin -- "="
return Left.Len = Right.Len and then Left.Value (1 .. Left.Len) = Right.Value (1 .. Right.Len);
end "=";
function "<" (Left : B_String; Right : B_String) return Boolean is
-- Empty declarative part
begin -- "<"
return Left.Value (1 .. Left.Len) < Right.Value (1 .. Right.Len);
end "<";
function "<=" (Left : B_String; Right : B_String) return Boolean is
-- Empty declarative part
begin -- "<="
return not (Left > Right);
end "<=";
function ">" (Left : B_String; Right : B_String) return Boolean is
-- Empty declarative part
begin -- ">"
return Left.Value (1 .. Left.Len) > Right.Value (1 .. Right.Len);
end ">";
function ">=" (Left : B_String; Right : B_String) return Boolean is
-- Empty declarative part
begin -- ">="
return not (Left < Right);
end ">=";
end PragmARC.B_Strings;
--
-- This is free software; you can redistribute it and/or modify it under
-- terms of the GNU General Public License as published by the Free Software
-- Foundation; either version 2, or (at your option) any later version.
-- This software 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. See the GNU General Public License
-- for more details. Free Software Foundation, 59 Temple Place - Suite
-- 330, Boston, MA 02111-1307, USA.
--
-- As a special exception, if other files instantiate generics from this
-- unit, or you link this unit with other files to produce an executable,
-- this unit does not by itself cause the resulting executable to be
-- covered by the GNU General Public License. This exception does not
-- however invalidate any other reasons why the executable file might be
-- covered by the GNU Public License.
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