gcc/ada/prj-ext.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              P R J . E X T                               --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 2000-2006, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- GNAT was originally developed  by the GNAT team at  New York University. --
  23 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  24 --                                                                          --
  25 ------------------------------------------------------------------------------
  26
  27 with Hostparm;
  28 with Namet;    use Namet;
  29 with Output;   use Output;
  30 with Osint;    use Osint;
  31 with Sdefault;
  32
  33 with GNAT.HTable;
  34
  35 package body Prj.Ext is
  36
  37    Gpr_Project_Path : constant String := "GPR_PROJECT_PATH";
  38    Ada_Project_Path : constant String := "ADA_PROJECT_PATH";
  39    --  Name of the env. variables that contain path name(s) of directories
  40    --  where project files may reside. GPR_PROJECT_PATH has precedence over
  41    --  ADA_PROJECT_PATH.
  42
  43    Gpr_Prj_Path : constant String_Access := Getenv (Gpr_Project_Path);
  44    Ada_Prj_Path : constant String_Access := Getenv (Ada_Project_Path);
  45    --  The path name(s) of directories where project files may reside.
  46    --  May be empty.
  47
  48    No_Project_Default_Dir : constant String := "-";
  49
  50    Current_Project_Path : String_Access;
  51    --  The project path. Initialized during elaboration of package Contains at
  52    --  least the current working directory.
  53
  54    package Htable is new GNAT.HTable.Simple_HTable
  55      (Header_Num => Header_Num,
  56       Element    => Name_Id,
  57       No_Element => No_Name,
  58       Key        => Name_Id,
  59       Hash       => Hash,
  60       Equal      => "=");
  61    --  External references are stored in this hash table, either by procedure
  62    --  Add (directly or through a call to function Check) or by function
  63    --  Value_Of when an environment variable is found non empty. Value_Of
  64    --  first for external reference in this table, before checking the
  65    --  environment. Htable is emptied (reset) by procedure Reset.
  66
  67    ---------
  68    -- Add --
  69    ---------
  70
  71    procedure Add
  72      (External_Name : String;
  73       Value         : String)
  74    is
  75       The_Key   : Name_Id;
  76       The_Value : Name_Id;
  77    begin
  78       Name_Len := Value'Length;
  79       Name_Buffer (1 .. Name_Len) := Value;
  80       The_Value := Name_Find;
  81       Name_Len := External_Name'Length;
  82       Name_Buffer (1 .. Name_Len) := External_Name;
  83       Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
  84       The_Key := Name_Find;
  85       Htable.Set (The_Key, The_Value);
  86    end Add;
  87
  88    -----------
  89    -- Check --
  90    -----------
  91
  92    function Check (Declaration : String) return Boolean is
  93    begin
  94       for Equal_Pos in Declaration'Range loop
  95          if Declaration (Equal_Pos) = '=' then
  96             exit when Equal_Pos = Declaration'First;
  97             exit when Equal_Pos = Declaration'Last;
  98             Add
  99               (External_Name =>
 100                  Declaration (Declaration'First .. Equal_Pos - 1),
 101                Value =>
 102                  Declaration (Equal_Pos + 1 .. Declaration'Last));
 103             return True;
 104          end if;
 105       end loop;
 106
 107       return False;
 108    end Check;
 109
 110    ------------------
 111    -- Project_Path --
 112    ------------------
 113
 114    function Project_Path return String is
 115    begin
 116       return Current_Project_Path.all;
 117    end Project_Path;
 118
 119    -----------
 120    -- Reset --
 121    -----------
 122
 123    procedure Reset is
 124    begin
 125       Htable.Reset;
 126    end Reset;
 127
 128    ----------------------
 129    -- Set_Project_Path --
 130    ----------------------
 131
 132    procedure Set_Project_Path (New_Path : String) is
 133    begin
 134       Free (Current_Project_Path);
 135       Current_Project_Path := new String'(New_Path);
 136    end Set_Project_Path;
 137
 138    --------------
 139    -- Value_Of --
 140    --------------
 141
 142    function Value_Of
 143      (External_Name : Name_Id;
 144       With_Default  : Name_Id := No_Name)
 145       return          Name_Id
 146    is
 147       The_Value : Name_Id;
 148       Name      : String := Get_Name_String (External_Name);
 149
 150    begin
 151       Canonical_Case_File_Name (Name);
 152       Name_Len := Name'Length;
 153       Name_Buffer (1 .. Name_Len) := Name;
 154       The_Value := Htable.Get (Name_Find);
 155
 156       if The_Value /= No_Name then
 157          return The_Value;
 158       end if;
 159
 160       --  Find if it is an environment, if it is, put value in the hash table
 161
 162       declare
 163          Env_Value : String_Access := Getenv (Name);
 164
 165       begin
 166          if Env_Value /= null and then Env_Value'Length > 0 then
 167             Name_Len := Env_Value'Length;
 168             Name_Buffer (1 .. Name_Len) := Env_Value.all;
 169             The_Value := Name_Find;
 170             Htable.Set (External_Name, The_Value);
 171             Free (Env_Value);
 172             return The_Value;
 173
 174          else
 175             Free (Env_Value);
 176             return With_Default;
 177          end if;
 178       end;
 179    end Value_Of;
 180
 181 begin
 182    --  Initialize Current_Project_Path during package elaboration
 183
 184    declare
 185       Add_Default_Dir : Boolean := True;
 186       First           : Positive;
 187       Last            : Positive;
 188       New_Len         : Positive;
 189       New_Last        : Positive;
 190       Prj_Path        : String_Access := Gpr_Prj_Path;
 191
 192    begin
 193       if Gpr_Prj_Path.all /= "" then
 194
 195          --  Warn if both environment variables are defined
 196
 197          if Ada_Prj_Path.all /= "" then
 198             Write_Line ("Warning: ADA_PROJECT_PATH is not taken into account");
 199             Write_Line ("         when GPR_PROJECT_PATH is defined");
 200          end if;
 201
 202       else
 203          Prj_Path := Ada_Prj_Path;
 204       end if;
 205
 206       --  The current directory is always first
 207
 208       Name_Len := 1;
 209       Name_Buffer (Name_Len) := '.';
 210
 211       --  If environment variable is defined and not empty, add its content
 212
 213       if Prj_Path.all /= "" then
 214          Name_Len := Name_Len + 1;
 215          Name_Buffer (Name_Len) := Path_Separator;
 216
 217          Add_Str_To_Name_Buffer (Prj_Path.all);
 218
 219          --  Scan the directory path to see if "-" is one of the directories.
 220          --  Remove each occurence of "-" and set Add_Default_Dir to False.
 221          --  Also resolve relative paths and symbolic links.
 222
 223          First := 3;
 224          loop
 225             while First <= Name_Len
 226               and then (Name_Buffer (First) = Path_Separator)
 227             loop
 228                First := First + 1;
 229             end loop;
 230
 231             exit when First > Name_Len;
 232
 233             Last := First;
 234
 235             while Last < Name_Len
 236               and then Name_Buffer (Last + 1) /= Path_Separator
 237             loop
 238                Last := Last + 1;
 239             end loop;
 240
 241             --  If the directory is "-", set Add_Default_Dir to False and
 242             --  remove from path.
 243
 244             if Name_Buffer (First .. Last) = No_Project_Default_Dir then
 245                Add_Default_Dir := False;
 246
 247                for J in Last + 1 .. Name_Len loop
 248                   Name_Buffer (J - No_Project_Default_Dir'Length - 1) :=
 249                     Name_Buffer (J);
 250                end loop;
 251
 252                Name_Len := Name_Len - No_Project_Default_Dir'Length - 1;
 253
 254             elsif not Hostparm.OpenVMS
 255               or else not Is_Absolute_Path (Name_Buffer (First .. Last))
 256             then
 257                --  On VMS, only expand relative path names, as absolute paths
 258                --  may correspond to multi-valued VMS logical names.
 259
 260                declare
 261                   New_Dir : constant String :=
 262                               Normalize_Pathname (Name_Buffer (First .. Last));
 263
 264                begin
 265                   --  If the absolute path was resolved and is different from
 266                   --  the original, replace original with the resolved path.
 267
 268                   if New_Dir /= Name_Buffer (First .. Last)
 269                     and then New_Dir'Length /= 0
 270                   then
 271                      New_Len := Name_Len + New_Dir'Length - (Last - First + 1);
 272                      New_Last := First + New_Dir'Length - 1;
 273                      Name_Buffer (New_Last + 1 .. New_Len) :=
 274                        Name_Buffer (Last + 1 .. Name_Len);
 275                      Name_Buffer (First .. New_Last) := New_Dir;
 276                      Name_Len := New_Len;
 277                      Last := New_Last;
 278                   end if;
 279                end;
 280             end if;
 281
 282             First := Last + 1;
 283          end loop;
 284       end if;
 285
 286       --  Set the initial value of Current_Project_Path
 287
 288       if Add_Default_Dir then
 289          Current_Project_Path :=
 290            new String'(Name_Buffer (1 .. Name_Len) & Path_Separator &
 291                        Sdefault.Search_Dir_Prefix.all & ".." &
 292                        Directory_Separator & ".." & Directory_Separator &
 293                        ".." & Directory_Separator & "gnat");
 294       else
 295          Current_Project_Path := new String'(Name_Buffer (1 .. Name_Len));
 296       end if;
 297    end;
 298 end Prj.Ext;