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-------------------------------------------------------------------------------
-- --
-- GNADE : GNat Ada Database Environment --
-- --
-- Filename : $Source: /cvsroot/gnade/gnade/support/gnu-db-support-string_builder.adb,v $
-- Description : Simple string builder package --
-- Author : Michael Erdmann <Michael.Erdmann@snafu.de> --
-- Created On : 16-Mar-2002 --
-- Last Modified By: $Author: persan $
-- Last Modified On: $Date: 2007/08/24 21:33:41 $ --
-- Status : $State: Exp $ --
-- --
-- Copyright (C) 2000-2002 Michael Erdmann --
-- --
-- GNADE 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 2, 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING. If not, write --
-- to the 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. --
-- --
-- GNADE is implemented to work with GNAT, the GNU Ada compiler. --
-- --
-- <a> --
-- Functional Description --
-- ====================== --
-- --
-- --
-- Restrictions --
-- ============ --
-- R.1 - The handling of the tree nodes is currently not task save --
-- --
-- References --
-- ========== --
-- None --
-- --
-------------------------------------------------------------------------------
with Unchecked_Deallocation;
package body GNU.DB.Support.String_Builder is
type String_Access is access String;
----------------------
-- Object_Data_Type --
----------------------
type Object_Data_Type is record
Length : Natural := 0;
Buffer : String_Access := null;
end record;
procedure Free is new Unchecked_Deallocation
(String, String_Access);
procedure Free is new Unchecked_Deallocation
(Object_Data_Type, Object_Data_Access);
----------------
-- Initialize --
----------------
function Initialize return Object_Data_Access is
Result : constant Object_Data_Access := new Object_Data_Type;
begin
return Result;
end Initialize;
--------------
-- Finalize --
--------------
procedure Finalize (
This : in out Object) is
begin
if This.Data.Buffer /= null then
Free (This.Data.Buffer);
end if;
Free (This.Data);
end Finalize;
---------------
-- To_String --
----------------
function To_String (
This : in Object) return String is
-- convert the contents of the string buffer into a string
Data : Object_Data_Access renames This.Data;
begin
return Data.Buffer (1 .. Data.Length);
end To_String;
-----------
-- Clear --
-----------
procedure Clear (
This : in out Object) is
Data : Object_Data_Access renames This.Data;
begin
Data.Length := 0;
end Clear;
------------
-- Insert --
------------
procedure Insert (
This : in out Object;
Char : in Character) is
-- Insert a character into the string buffer.
-- R.1 - If the buffer does not exist create a buffer with 1000 chars
-- R.2 - If the buffer get to low to store the character extend the
-- buffer.
Data : Object_Data_Access renames This.Data;
begin
if Data.Buffer = null then
Data.Buffer := new String (1 .. 2000);
Data.Length := 0;
end if;
if not (Data.Length + 1 > Data.Buffer'Length) then
declare
Tmp : constant String_Access := new String (1 .. (Data.Length + 1000));
begin
Tmp (1 .. Data.Length) := Data.Buffer (1 .. Data.Length);
Free (Data.Buffer);
Data.Buffer := Tmp;
end;
Data.Length := Data.Length + 1;
Data.Buffer (Data.Length) := Char;
end if;
end Insert;
------------
-- Insert --
------------
procedure Insert (
This : in out Object;
Str : in String) is
begin
for i in Str'Range loop
Insert (This, Str (i));
end loop;
end Insert;
end GNU.DB.Support.String_Builder;
|
