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|
-------------------------------------------------------------------------------
--
-- This file is part of AdaBrowse.
--
-- <STRONG>Copyright (c) 2002 by Thomas Wolf.</STRONG>
-- <BLOCKQUOTE>
-- AdaBrowse is free software; you can redistribute it and/or modify it
-- under the terms of the GNU General Public License as published by the
-- Free Software Foundation; either version 2, or (at your option) any
-- later version. AdaBrowse is distributed in the hope that it will be
-- useful, but <EM>without any warranty</EM>; without even the implied
-- warranty of <EM>merchantability or fitness for a particular purpose.</EM>
-- See the GNU General Public License for more details. You should have
-- received a copy of the GNU General Public License with this distribution,
-- see file "<A HREF="GPL.txt">GPL.txt</A>". If not, write to the Free
-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
-- USA.
-- </BLOCKQUOTE>
--
-- <DL><DT><STRONG>
-- Author:</STRONG><DD>
-- Thomas Wolf (TW)
-- <ADDRESS><A HREF="mailto:twolf@acm.org">twolf@acm.org</A></ADDRESS></DL>
--
-- <DL><DT><STRONG>
-- Purpose:</STRONG><DD>
-- Environment variable management.</DL>
--
-- <!--
-- Revision History
--
-- 18-NOV-2003 TW Initial version
-- -->
-------------------------------------------------------------------------------
pragma License (GPL);
with AD.Messages;
with AD.Projects;
with GAL.ADT.Hash_Tables;
with GAL.Storage.Standard;
with GAL.Support.Hashing;
with Util.Environment;
with Util.Strings;
pragma Elaborate_All (GAL.ADT.Hash_Tables);
package body AD.Environment is
package Env_Tables is
new GAL.ADT.Hash_Tables
(Key_Type => String,
Item => String,
Memory => GAL.Storage.Standard,
Hash => GAL.Support.Hashing.Hash_Case_Insensitive,
"=" => Util.Strings.Equal);
My_Environment : Env_Tables.Hash_Table;
function Get
(Name : in String)
return String
is
begin
return Env_Tables.Retrieve (My_Environment, Name);
exception
when Env_Tables.Container_Empty |
Env_Tables.Not_Found =>
-- Check the real environment.
begin
declare
Value : constant String := Util.Environment.Get (Name);
begin
Set (Name, Value);
return Value;
end;
exception
when Util.Environment.Not_Defined =>
return "";
end;
end Get;
procedure Set
(Name : in String;
Value : in String)
is
begin
AD.Messages.Debug
("Registering environment binding " & Name & "=" & Value);
Env_Tables.Replace (My_Environment, Key => Name, Element => Value);
AD.Projects.Define_Variable (Name, Value);
end Set;
function Is_Defined
(Name : in String)
return Boolean
is
begin
if Env_Tables.Contains (My_Environment, Name) then
return True;
end if;
begin
Set (Name, Util.Environment.Get (Name));
return True;
exception
when Util.Environment.Not_Defined =>
return False;
end;
end Is_Defined;
procedure Add
(Assignment : in String)
is
-- We have a string name=value. Name must not contain embedded white
-- space. Leading and trailing white space in name or value is trimmed.
-- The whole assignment must already be unquoted, if it was enclosed
-- in quotes.
use Util.Strings;
I : Natural;
begin
I := First_Index (Assignment, '=');
if I <= Assignment'First then raise Invalid_Variable_Assignment; end if;
declare
Name : constant String :=
Trim (Assignment (Assignment'First .. I - 1));
Value : constant String :=
Trim (Assignment (I + 1 .. Assignment'Last));
begin
if Name'Length = 0 or else Next_Blank (Name) /= 0 then
raise Invalid_Variable_Assignment;
end if;
Set (Name, Value);
end;
end Add;
begin
Env_Tables.Set_Resize (My_Environment, 0.75);
declare
Linear_Growth : GAL.Support.Hashing.Linear_Growth_Policy (20);
begin
Env_Tables.Set_Growth_Policy (My_Environment, Linear_Growth);
end;
end AD.Environment;
|
