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Line No. Rev Author Line
1 706 jeremybenn 
------------------------------------------------------------------------------
2 
--                                                                          --
3 
--                         GNAT COMPILER COMPONENTS                         --
4 
--                                                                          --
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--                              P R J . E X T                               --
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--                                                                          --
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--                                 B o d y                                  --
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--                                                                          --
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--          Copyright (C) 2000-2011, Free Software Foundation, Inc.         --
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--                                                                          --
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-- GNAT is free software;  you can  redistribute it  and/or modify it under --
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-- terms of the  GNU General Public License as published  by the Free Soft- --
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-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
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-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
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-- for  more details.  You should have  received  a copy of the GNU General --
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-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
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-- http://www.gnu.org/licenses for a complete copy of the license.          --
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--                                                                          --
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-- GNAT was originally developed  by the GNAT team at  New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc.      --
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--                                                                          --
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------------------------------------------------------------------------------
25 
 
26 
with Osint;    use Osint;
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with Ada.Unchecked_Deallocation;
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30 
package body Prj.Ext is
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32 
   ----------------
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   -- Initialize --
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   ----------------
35 
 
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   procedure Initialize
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     (Self      : out External_References;
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      Copy_From : External_References := No_External_Refs)
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   is
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      N  : Name_To_Name_Ptr;
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      N2 : Name_To_Name_Ptr;
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   begin
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      if Self.Refs = null then
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         Self.Refs := new Name_To_Name_HTable.Instance;
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         if Copy_From.Refs /= null then
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            N := Name_To_Name_HTable.Get_First (Copy_From.Refs.all);
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            while N /= null loop
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               N2 := new Name_To_Name'
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                           (Key    => N.Key,
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                            Value  => N.Value,
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                            Source => N.Source,
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                            Next   => null);
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               Name_To_Name_HTable.Set (Self.Refs.all, N2);
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               N := Name_To_Name_HTable.Get_Next (Copy_From.Refs.all);
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            end loop;
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         end if;
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      end if;
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   end Initialize;
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   ---------
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   -- Add --
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   ---------
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   procedure Add
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     (Self          : External_References;
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      External_Name : String;
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      Value         : String;
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      Source        : External_Source := External_Source'First)
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   is
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      Key : Name_Id;
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      N   : Name_To_Name_Ptr;
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   begin
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      Name_Len := External_Name'Length;
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      Name_Buffer (1 .. Name_Len) := External_Name;
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      Canonical_Case_Env_Var_Name (Name_Buffer (1 .. Name_Len));
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      Key := Name_Find;
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      --  Check whether the value is already defined, to properly respect the
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      --  overriding order.
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      if Source /= External_Source'First then
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         N := Name_To_Name_HTable.Get (Self.Refs.all, Key);
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         if N /= null then
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            if External_Source'Pos (N.Source) <
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               External_Source'Pos (Source)
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            then
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               if Current_Verbosity = High then
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                  Debug_Output
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                    ("Not overridding existing variable '" & External_Name
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                     & "', value was defined in " & N.Source'Img);
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               end if;
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               return;
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            end if;
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         end if;
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      end if;
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      Name_Len := Value'Length;
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      Name_Buffer (1 .. Name_Len) := Value;
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      N := new Name_To_Name'
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                 (Key    => Key,
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                  Source => Source,
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                  Value  => Name_Find,
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                  Next   => null);
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      if Current_Verbosity = High then
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         Debug_Output ("Add external (" & External_Name & ") is", N.Value);
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      end if;
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      Name_To_Name_HTable.Set (Self.Refs.all, N);
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   end Add;
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   -----------
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   -- Check --
117 
   -----------
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   function Check
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     (Self        : External_References;
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      Declaration : String) return Boolean
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   is
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   begin
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      for Equal_Pos in Declaration'Range loop
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         if Declaration (Equal_Pos) = '=' then
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            exit when Equal_Pos = Declaration'First;
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            Add
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              (Self          => Self,
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               External_Name =>
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                 Declaration (Declaration'First .. Equal_Pos - 1),
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               Value         =>
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                 Declaration (Equal_Pos + 1 .. Declaration'Last),
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               Source        => From_Command_Line);
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            return True;
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         end if;
136 
      end loop;
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      return False;
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   end Check;
140 
 
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   -----------
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   -- Reset --
143 
   -----------
144 
 
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   procedure Reset (Self : External_References) is
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   begin
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      if Self.Refs /= null then
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         Debug_Output ("Reset external references");
149 
         Name_To_Name_HTable.Reset (Self.Refs.all);
150 
      end if;
151 
   end Reset;
152 
 
153 
   --------------
154 
   -- Value_Of --
155 
   --------------
156 
 
157 
   function Value_Of
158 
     (Self          : External_References;
159 
      External_Name : Name_Id;
160 
      With_Default  : Name_Id := No_Name)
161 
      return          Name_Id
162 
   is
163 
      Value : Name_To_Name_Ptr;
164 
      Val   : Name_Id;
165 
      Name  : String := Get_Name_String (External_Name);
166 
 
167 
   begin
168 
      Canonical_Case_Env_Var_Name (Name);
169 
 
170 
      if Self.Refs /= null then
171 
         Name_Len := Name'Length;
172 
         Name_Buffer (1 .. Name_Len) := Name;
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         Value := Name_To_Name_HTable.Get (Self.Refs.all, Name_Find);
174 
 
175 
         if Value /= null then
176 
            Debug_Output ("Value_Of (" & Name & ") is in cache", Value.Value);
177 
            return Value.Value;
178 
         end if;
179 
      end if;
180 
 
181 
      --  Find if it is an environment, if it is, put value in the hash table
182 
 
183 
      declare
184 
         Env_Value : String_Access := Getenv (Name);
185 
 
186 
      begin
187 
         if Env_Value /= null and then Env_Value'Length > 0 then
188 
            Name_Len := Env_Value'Length;
189 
            Name_Buffer (1 .. Name_Len) := Env_Value.all;
190 
            Val := Name_Find;
191 
 
192 
            if Current_Verbosity = High then
193 
               Debug_Output ("Value_Of (" & Name & ") is", Val);
194 
            end if;
195 
 
196 
            if Self.Refs /= null then
197 
               Value := new Name_To_Name'
198 
                 (Key    => External_Name,
199 
                  Value  => Val,
200 
                  Source => From_Environment,
201 
                  Next   => null);
202 
               Name_To_Name_HTable.Set (Self.Refs.all, Value);
203 
            end if;
204 
 
205 
            Free (Env_Value);
206 
            return Val;
207 
 
208 
         else
209 
            if Current_Verbosity = High then
210 
               Debug_Output
211 
                 ("Value_Of (" & Name & ") is default", With_Default);
212 
            end if;
213 
 
214 
            Free (Env_Value);
215 
            return With_Default;
216 
         end if;
217 
      end;
218 
   end Value_Of;
219 
 
220 
   ----------
221 
   -- Free --
222 
   ----------
223 
 
224 
   procedure Free (Self : in out External_References) is
225 
      procedure Unchecked_Free is new Ada.Unchecked_Deallocation
226 
        (Name_To_Name_HTable.Instance, Instance_Access);
227 
   begin
228 
      if Self.Refs /= null then
229 
         Reset (Self);
230 
         Unchecked_Free (Self.Refs);
231 
      end if;
232 
   end Free;
233 
 
234 
   --------------
235 
   -- Set_Next --
236 
   --------------
237 
 
238 
   procedure Set_Next (E : Name_To_Name_Ptr; Next : Name_To_Name_Ptr) is
239 
   begin
240 
      E.Next := Next;
241 
   end Set_Next;
242 
 
243 
   ----------
244 
   -- Next --
245 
   ----------
246 
 
247 
   function Next (E : Name_To_Name_Ptr) return Name_To_Name_Ptr is
248 
   begin
249 
      return E.Next;
250 
   end Next;
251 
 
252 
   -------------
253 
   -- Get_Key --
254 
   -------------
255 
 
256 
   function Get_Key (E : Name_To_Name_Ptr) return Name_Id is
257 
   begin
258 
      return E.Key;
259 
   end Get_Key;
260 
 
261 
end Prj.Ext;

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