aboutsummaryrefslogtreecommitdiff
path: root/gcc/ada/prj-ext.adb
blob: 649c2ba15e3aa0539bf0871da188049835970c24 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                              P R J . E X T                               --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 2000-2006, Free Software Foundation, Inc.         --
--                                                                          --
-- GNAT 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,  51  Franklin  Street,  Fifth  Floor, --
-- Boston, MA 02110-1301, USA.                                              --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

with Hostparm;
with Namet;    use Namet;
with Output;   use Output;
with Osint;    use Osint;
with Sdefault;

with GNAT.HTable;

package body Prj.Ext is

   Gpr_Project_Path : constant String := "GPR_PROJECT_PATH";
   Ada_Project_Path : constant String := "ADA_PROJECT_PATH";
   --  Name of the env. variables that contain path name(s) of directories
   --  where project files may reside. GPR_PROJECT_PATH has precedence over
   --  ADA_PROJECT_PATH.

   Gpr_Prj_Path : constant String_Access := Getenv (Gpr_Project_Path);
   Ada_Prj_Path : constant String_Access := Getenv (Ada_Project_Path);
   --  The path name(s) of directories where project files may reside.
   --  May be empty.

   No_Project_Default_Dir : constant String := "-";

   Current_Project_Path : String_Access;
   --  The project path. Initialized during elaboration of package Contains at
   --  least the current working directory.

   package Htable is new GNAT.HTable.Simple_HTable
     (Header_Num => Header_Num,
      Element    => Name_Id,
      No_Element => No_Name,
      Key        => Name_Id,
      Hash       => Hash,
      Equal      => "=");
   --  External references are stored in this hash table, either by procedure
   --  Add (directly or through a call to function Check) or by function
   --  Value_Of when an environment variable is found non empty. Value_Of
   --  first for external reference in this table, before checking the
   --  environment. Htable is emptied (reset) by procedure Reset.

   ---------
   -- Add --
   ---------

   procedure Add
     (External_Name : String;
      Value         : String)
   is
      The_Key   : Name_Id;
      The_Value : Name_Id;
   begin
      Name_Len := Value'Length;
      Name_Buffer (1 .. Name_Len) := Value;
      The_Value := Name_Find;
      Name_Len := External_Name'Length;
      Name_Buffer (1 .. Name_Len) := External_Name;
      Canonical_Case_File_Name (Name_Buffer (1 .. Name_Len));
      The_Key := Name_Find;
      Htable.Set (The_Key, The_Value);
   end Add;

   -----------
   -- Check --
   -----------

   function Check (Declaration : String) return Boolean is
   begin
      for Equal_Pos in Declaration'Range loop
         if Declaration (Equal_Pos) = '=' then
            exit when Equal_Pos = Declaration'First;
            exit when Equal_Pos = Declaration'Last;
            Add
              (External_Name =>
                 Declaration (Declaration'First .. Equal_Pos - 1),
               Value =>
                 Declaration (Equal_Pos + 1 .. Declaration'Last));
            return True;
         end if;
      end loop;

      return False;
   end Check;

   ------------------
   -- Project_Path --
   ------------------

   function Project_Path return String is
   begin
      return Current_Project_Path.all;
   end Project_Path;

   -----------
   -- Reset --
   -----------

   procedure Reset is
   begin
      Htable.Reset;
   end Reset;

   ----------------------
   -- Set_Project_Path --
   ----------------------

   procedure Set_Project_Path (New_Path : String) is
   begin
      Free (Current_Project_Path);
      Current_Project_Path := new String'(New_Path);
   end Set_Project_Path;

   --------------
   -- Value_Of --
   --------------

   function Value_Of
     (External_Name : Name_Id;
      With_Default  : Name_Id := No_Name)
      return          Name_Id
   is
      The_Value : Name_Id;
      Name      : String := Get_Name_String (External_Name);

   begin
      Canonical_Case_File_Name (Name);
      Name_Len := Name'Length;
      Name_Buffer (1 .. Name_Len) := Name;
      The_Value := Htable.Get (Name_Find);

      if The_Value /= No_Name then
         return The_Value;
      end if;

      --  Find if it is an environment, if it is, put value in the hash table

      declare
         Env_Value : String_Access := Getenv (Name);

      begin
         if Env_Value /= null and then Env_Value'Length > 0 then
            Name_Len := Env_Value'Length;
            Name_Buffer (1 .. Name_Len) := Env_Value.all;
            The_Value := Name_Find;
            Htable.Set (External_Name, The_Value);
            Free (Env_Value);
            return The_Value;

         else
            Free (Env_Value);
            return With_Default;
         end if;
      end;
   end Value_Of;

begin
   --  Initialize Current_Project_Path during package elaboration

   declare
      Add_Default_Dir : Boolean := True;
      First           : Positive;
      Last            : Positive;
      New_Len         : Positive;
      New_Last        : Positive;
      Prj_Path        : String_Access := Gpr_Prj_Path;

   begin
      if Gpr_Prj_Path.all /= "" then

         --  Warn if both environment variables are defined

         if Ada_Prj_Path.all /= "" then
            Write_Line ("Warning: ADA_PROJECT_PATH is not taken into account");
            Write_Line ("         when GPR_PROJECT_PATH is defined");
         end if;

      else
         Prj_Path := Ada_Prj_Path;
      end if;

      --  The current directory is always first

      Name_Len := 1;
      Name_Buffer (Name_Len) := '.';

      --  If environment variable is defined and not empty, add its content

      if Prj_Path.all /= "" then
         Name_Len := Name_Len + 1;
         Name_Buffer (Name_Len) := Path_Separator;

         Add_Str_To_Name_Buffer (Prj_Path.all);

         --  Scan the directory path to see if "-" is one of the directories.
         --  Remove each occurence of "-" and set Add_Default_Dir to False.
         --  Also resolve relative paths and symbolic links.

         First := 3;
         loop
            while First <= Name_Len
              and then (Name_Buffer (First) = Path_Separator)
            loop
               First := First + 1;
            end loop;

            exit when First > Name_Len;

            Last := First;

            while Last < Name_Len
              and then Name_Buffer (Last + 1) /= Path_Separator
            loop
               Last := Last + 1;
            end loop;

            --  If the directory is "-", set Add_Default_Dir to False and
            --  remove from path.

            if Name_Buffer (First .. Last) = No_Project_Default_Dir then
               Add_Default_Dir := False;

               for J in Last + 1 .. Name_Len loop
                  Name_Buffer (J - No_Project_Default_Dir'Length - 1) :=
                    Name_Buffer (J);
               end loop;

               Name_Len := Name_Len - No_Project_Default_Dir'Length - 1;

            elsif not Hostparm.OpenVMS
              or else not Is_Absolute_Path (Name_Buffer (First .. Last))
            then
               --  On VMS, only expand relative path names, as absolute paths
               --  may correspond to multi-valued VMS logical names.

               declare
                  New_Dir : constant String :=
                              Normalize_Pathname (Name_Buffer (First .. Last));

               begin
                  --  If the absolute path was resolved and is different from
                  --  the original, replace original with the resolved path.

                  if New_Dir /= Name_Buffer (First .. Last)
                    and then New_Dir'Length /= 0
                  then
                     New_Len := Name_Len + New_Dir'Length - (Last - First + 1);
                     New_Last := First + New_Dir'Length - 1;
                     Name_Buffer (New_Last + 1 .. New_Len) :=
                       Name_Buffer (Last + 1 .. Name_Len);
                     Name_Buffer (First .. New_Last) := New_Dir;
                     Name_Len := New_Len;
                     Last := New_Last;
                  end if;
               end;
            end if;

            First := Last + 1;
         end loop;
      end if;

      --  Set the initial value of Current_Project_Path

      if Add_Default_Dir then
         Current_Project_Path :=
           new String'(Name_Buffer (1 .. Name_Len) & Path_Separator &
                       Sdefault.Search_Dir_Prefix.all & ".." &
                       Directory_Separator & ".." & Directory_Separator &
                       ".." & Directory_Separator & "gnat");
      else
         Current_Project_Path := new String'(Name_Buffer (1 .. Name_Len));
      end if;
   end;
end Prj.Ext;