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-------------------------------------------------------------------------------
-- --
-- GNADE : GNu Ada Database Environment --
-- --
-- Filename : $Source: /var/cvs/gnuada/gnade/support/gnu-db-support-tables.ads,v $
-- Description : Symbol Table Manager for the ESQL
-- Author : Michael Erdmann <Michael.Erdmann@snafu.de>
-- Created On : 29-Oct-2000
-- Last Modified By: $Author: me $
-- Last Modified On: $Date: 2001/02/25 12:12:10 $
-- Status : $State: Exp $
--
-- Copyright (C) 2000-2001 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. --
-- --
-- Functional Description --
-- ====================== --
-- This package supports an index tree for symbol tables. The package is --
-- only inteded for use with the esql translator and the related support --
-- packages. --
-- --
-- Restrictions --
-- ============ --
-- R.1 - The handling of the tree nodes is currently not task save --
-- --
-- References --
-- ========== --
-- None --
-- --
-------------------------------------------------------------------------------
generic
type Symbol_Information_Type is private;
package GNU.DB.Support.Tables is
type Tree_Node is private;
type Tree_Node_Access is access Tree_Node;
Usage_Error : exception;
Already_Stored : exception;
Entry_Not_Found : exception;
---------------------------------------------------------------------------
-- Description:
-- This function creates an instance of the index tree
-- Preconditions:
-- None
-- Postconditions:
-- The tree node instance is intialized
-- Exceptions:
-- None
-- Notes:
-- None
---------------------------------------------------------------------------
function Create_Tree return Tree_Node_Access;
---------------------------------------------------------------------------
-- Description:
-- The information is stored in the symbol table under the
-- given Name.
--
-- Preconditions:
-- P1 - The Tree_Node pointer has to be created by means
-- of Create_Tree.
-- P2 - The Name is not already stored in the tree
-- Postconditions:
-- C1 - The Name and the information are stored in the table.
-- Exceptions:
-- Usage_Error : Pre.cond. P1 violated
-- Already_Stored : Pre.cond. P2 vialoated
--
-- Notes:
--
---------------------------------------------------------------------------
procedure Insert(
T : in out Tree_Node_Access;
Name : in String;
Info : Symbol_Information_Type );
---------------------------------------------------------------------------
-- Description:
--
-- Preconditions:
--
-- Postconditions:
--
-- Exceptions:
--
-- Notes:
-- None
---------------------------------------------------------------------------
procedure Fetch(
T : in out Tree_Node_Access ;
Name : in String;
Info : out Symbol_Information_Type );
---------------------------------------------------------------------------
-- Description:
--
-- Preconditions:
--
-- Postconditions:
--
-- Exceptions:
--
-- Notes:
-- None
---------------------------------------------------------------------------
procedure Update(
T : in out Tree_Node_Access;
Name : in String;
Info : in Symbol_Information_Type );
---------------------------------------------------------------------------
-- Description:
--
-- Preconditions:
--
-- Postconditions:
--
-- Exceptions:
--
-- Notes:
-- None
---------------------------------------------------------------------------
procedure Delete(
T : in out Tree_Node_Access;
Name : in String );
-- ===================================================================== --
private
type Leaf_Type;
type Leaf_Access is access Leaf_Type;
type Tree_Node is record
Root : Leaf_Access := null; -- root element of the index tree
end record;
-- this is the tree node, which contains all the data which
-- is used to maintain and operate on the index tree.
end GNU.DB.Support.Tables;
|
