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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                             P R J . P A R T                              --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 2001-2009, 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 3,  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 COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

with Err_Vars; use Err_Vars;

with Opt;      use Opt;

with Osint;    use Osint;

with Output;   use Output;

with Prj.Com;  use Prj.Com;

with Prj.Dect;

with Prj.Err;  use Prj.Err;

with Prj.Ext;  use Prj.Ext;

with Sinput;   use Sinput;

with Sinput.P; use Sinput.P;

with Snames;

with Table;

with Ada.Characters.Handling;    use Ada.Characters.Handling;

with Ada.Exceptions;             use Ada.Exceptions;

with GNAT.Directory_Operations; use GNAT.Directory_Operations;

with System.HTable;              use System.HTable;

package body Prj.Part is

   Buffer      : String_Access;

   Buffer_Last : Natural := 0;

   Dir_Sep : Character renames GNAT.OS_Lib.Directory_Separator;

   ------------------------------------

   -- Local Packages and Subprograms --

   ------------------------------------

   type With_Id is new Nat;

   No_With : constant With_Id := 0;

   type With_Record is record

      Path         : Path_Name_Type;

      Location     : Source_Ptr;

      Limited_With : Boolean;

      Node         : Project_Node_Id;

      Next         : With_Id;

   end record;

   --  Information about an imported project, to be put in table Withs below

   package Withs is new Table.Table

     (Table_Component_Type => With_Record,

      Table_Index_Type     => With_Id,

      Table_Low_Bound      => 1,

      Table_Initial        => 10,

      Table_Increment      => 100,

      Table_Name           => "Prj.Part.Withs");

   --  Table used to store temporarily paths and locations of imported

   --  projects. These imported projects will be effectively parsed later: just

   --  before parsing the current project for the non limited withed projects,

   --  after getting its name; after complete parsing of the current project

   --  for the limited withed projects.

   type Names_And_Id is record

      Path_Name           : Path_Name_Type;

      Canonical_Path_Name : Path_Name_Type;

      Id                  : Project_Node_Id;

      Limited_With        : Boolean;

   end record;

   package Project_Stack is new Table.Table

     (Table_Component_Type => Names_And_Id,

      Table_Index_Type     => Nat,

      Table_Low_Bound      => 1,

      Table_Initial        => 10,

      Table_Increment      => 100,

      Table_Name           => "Prj.Part.Project_Stack");

   --  This table is used to detect circular dependencies

   --  for imported and extended projects and to get the project ids of

   --  limited imported projects when there is a circularity with at least

   --  one limited imported project file.

   package Virtual_Hash is new System.HTable.Simple_HTable

     (Header_Num => Header_Num,

      Element    => Project_Node_Id,

      No_Element => Empty_Node,

      Key        => Project_Node_Id,

      Hash       => Prj.Tree.Hash,

      Equal      => "=");

   --  Hash table to store the node id of the project for which a virtual

   --  extending project need to be created.

   package Processed_Hash is new System.HTable.Simple_HTable

     (Header_Num => Header_Num,

      Element    => Boolean,

      No_Element => False,

      Key        => Project_Node_Id,

      Hash       => Prj.Tree.Hash,

      Equal      => "=");

   --  Hash table to store the project process when looking for project that

   --  need to have a virtual extending project, to avoid processing the same

   --  project twice.

   package Projects_Paths is new System.HTable.Simple_HTable

     (Header_Num => Header_Num,

      Element    => Path_Name_Type,

      No_Element => No_Path,

      Key        => Name_Id,

      Hash       => Hash,

      Equal      => "=");

   --  Hash table to cache project path to avoid looking for them on the path

   procedure Create_Virtual_Extending_Project

     (For_Project  : Project_Node_Id;

      Main_Project : Project_Node_Id;

      In_Tree      : Project_Node_Tree_Ref);

   --  Create a virtual extending project of For_Project. Main_Project is

   --  the extending all project.

   --

   --  The String_Value_Of is not set for the automatically added with

   --  clause and keeps the default value of No_Name. This enables Prj.PP

   --  to skip these automatically added with clauses to be processed.

   procedure Look_For_Virtual_Projects_For

     (Proj                : Project_Node_Id;

      In_Tree             : Project_Node_Tree_Ref;

      Potentially_Virtual : Boolean);

   --  Look for projects that need to have a virtual extending project.

   --  This procedure is recursive. If called with Potentially_Virtual set to

   --  True, then Proj may need an virtual extending project; otherwise it

   --  does not (because it is already extended), but other projects that it

   --  imports may need to be virtually extended.

   type Extension_Origin is (None, Extending_Simple, Extending_All);

   --  Type of parameter From_Extended for procedures Parse_Single_Project and

   --  Post_Parse_Context_Clause. Extending_All means that we are parsing the

   --  tree rooted at an extending all project.

   procedure Parse_Single_Project

     (In_Tree           : Project_Node_Tree_Ref;

      Project           : out Project_Node_Id;

      Extends_All       : out Boolean;

      Path_Name         : String;

      Extended          : Boolean;

      From_Extended     : Extension_Origin;

      In_Limited        : Boolean;

      Packages_To_Check : String_List_Access;

      Depth             : Natural;

      Current_Dir       : String;

      Is_Config_File    : Boolean;

      Flags             : Processing_Flags);

   --  Parse a project file. This is a recursive procedure: it calls itself for

   --  imported and extended projects. When From_Extended is not None, if the

   --  project has already been parsed and is an extended project A, return the

   --  ultimate (not extended) project that extends A. When In_Limited is True,

   --  the importing path includes at least one "limited with". When parsing

   --  configuration projects, do not allow a depth > 1.

   --

   --  Is_Config_File should be set to True if the project represents a config

   --  file (.cgpr) since some specific checks apply.

   procedure Pre_Parse_Context_Clause

     (In_Tree        : Project_Node_Tree_Ref;

      Context_Clause : out With_Id;

      Is_Config_File : Boolean;

      Flags          : Processing_Flags);

   --  Parse the context clause of a project. Store the paths and locations of

   --  the imported projects in table Withs. Does nothing if there is no

   --  context clause (if the current token is not "with" or "limited" followed

   --  by "with").

   --  Is_Config_File should be set to True if the project represents a config

   --  file (.cgpr) since some specific checks apply.

   procedure Post_Parse_Context_Clause

     (Context_Clause    : With_Id;

      In_Tree           : Project_Node_Tree_Ref;

      Limited_Withs     : Boolean;

      Imported_Projects : in out Project_Node_Id;

      Project_Directory : Path_Name_Type;

      From_Extended     : Extension_Origin;

      In_Limited        : Boolean;

      Packages_To_Check : String_List_Access;

      Depth             : Natural;

      Current_Dir       : String;

      Is_Config_File    : Boolean;

      Flags             : Processing_Flags);

   --  Parse the imported projects that have been stored in table Withs, if

   --  any. From_Extended is used for the call to Parse_Single_Project below.

   --  When In_Limited is True, the importing path includes at least one

   --  "limited with". When Limited_Withs is False, only non limited withed

   --  projects are parsed. When Limited_Withs is True, only limited withed

   --  projects are parsed.

   --  Is_Config_File should be set to True if the project represents a config

   --  file (.cgpr) since some specific checks apply.

   function Project_Path_Name_Of

     (In_Tree           : Project_Node_Tree_Ref;

      Project_File_Name : String;

      Directory         : String) return String;

   --  Returns the path name of a project file. Returns an empty string

   --  if project file cannot be found.

   function Project_Name_From

     (Path_Name      : String;

      Is_Config_File : Boolean) return Name_Id;

   --  Returns the name of the project that corresponds to its path name.

   --  Returns No_Name if the path name is invalid, because the corresponding

   --  project name does not have the syntax of an ada identifier.

   --------------------------------------

   -- Create_Virtual_Extending_Project --

   --------------------------------------

   procedure Create_Virtual_Extending_Project

     (For_Project  : Project_Node_Id;

      Main_Project : Project_Node_Id;

      In_Tree      : Project_Node_Tree_Ref)

   is

      Virtual_Name : constant String :=

                       Virtual_Prefix &

                         Get_Name_String (Name_Of (For_Project, In_Tree));

      --  The name of the virtual extending project

      Virtual_Name_Id : Name_Id;

      --  Virtual extending project name id

      Virtual_Path_Id : Path_Name_Type;

      --  Fake path name of the virtual extending project. The directory is

      --  the same directory as the extending all project.

      --  The source of the virtual extending project is something like:

      --  project V$<project name> extends <project path> is

      --     for Source_Dirs use ();

      --  end V$<project name>;

      --  The project directory cannot be specified during parsing; it will be

      --  put directly in the virtual extending project data during processing.

      --  Nodes that made up the virtual extending project

      Virtual_Project         : Project_Node_Id;

      With_Clause             : constant Project_Node_Id :=

                                  Default_Project_Node

                                    (In_Tree, N_With_Clause);

      Project_Declaration     : Project_Node_Id;

      Source_Dirs_Declaration : constant Project_Node_Id :=

                                  Default_Project_Node

                                    (In_Tree, N_Declarative_Item);

      Source_Dirs_Attribute   : constant Project_Node_Id :=

                                  Default_Project_Node

                                    (In_Tree, N_Attribute_Declaration, List);

      Source_Dirs_Expression  : constant Project_Node_Id :=

                                  Default_Project_Node

                                    (In_Tree, N_Expression, List);

      Source_Dirs_Term        : constant Project_Node_Id :=

                                  Default_Project_Node

                                    (In_Tree, N_Term, List);

      Source_Dirs_List        : constant Project_Node_Id :=

                                  Default_Project_Node

                                    (In_Tree, N_Literal_String_List, List);

   begin

      --  Get the virtual path name

      Get_Name_String (Path_Name_Of (Main_Project, In_Tree));

      while Name_Len > 0

        and then Name_Buffer (Name_Len) /= Directory_Separator

        and then Name_Buffer (Name_Len) /= '/'

      loop

         Name_Len := Name_Len - 1;

      end loop;

      Name_Buffer (Name_Len + 1 .. Name_Len + Virtual_Name'Length) :=

        Virtual_Name;

      Name_Len := Name_Len + Virtual_Name'Length;

      Virtual_Path_Id := Name_Find;

      --  Get the virtual name id

      Name_Len := Virtual_Name'Length;

      Name_Buffer (1 .. Name_Len) := Virtual_Name;

      Virtual_Name_Id := Name_Find;

      Virtual_Project := Create_Project

        (In_Tree        => In_Tree,

         Name           => Virtual_Name_Id,

         Full_Path      => Virtual_Path_Id,

         Is_Config_File => False);

      Project_Declaration := Project_Declaration_Of (Virtual_Project, In_Tree);

      --  With clause

      Set_Name_Of (With_Clause, In_Tree, Virtual_Name_Id);

      Set_Path_Name_Of (With_Clause, In_Tree, Virtual_Path_Id);

      Set_Project_Node_Of (With_Clause, In_Tree, Virtual_Project);

      Set_Next_With_Clause_Of

        (With_Clause, In_Tree, First_With_Clause_Of (Main_Project, In_Tree));

      Set_First_With_Clause_Of (Main_Project, In_Tree, With_Clause);

      --  Virtual project node

      Set_Location_Of

        (Virtual_Project, In_Tree, Location_Of (Main_Project, In_Tree));

      Set_Extended_Project_Path_Of

        (Virtual_Project, In_Tree, Path_Name_Of (For_Project, In_Tree));

      --  Project declaration

      Set_First_Declarative_Item_Of

        (Project_Declaration, In_Tree, Source_Dirs_Declaration);

      Set_Extended_Project_Of (Project_Declaration, In_Tree, For_Project);

      --  Source_Dirs declaration

      Set_Current_Item_Node

        (Source_Dirs_Declaration, In_Tree, Source_Dirs_Attribute);

      --  Source_Dirs attribute

      Set_Name_Of (Source_Dirs_Attribute, In_Tree, Snames.Name_Source_Dirs);

      Set_Expression_Of

        (Source_Dirs_Attribute, In_Tree, Source_Dirs_Expression);

      --  Source_Dirs expression

      Set_First_Term (Source_Dirs_Expression, In_Tree, Source_Dirs_Term);

      --  Source_Dirs term

      Set_Current_Term (Source_Dirs_Term, In_Tree, Source_Dirs_List);

      --  Source_Dirs empty list: nothing to do

   end Create_Virtual_Extending_Project;

   -----------------------------------

   -- Look_For_Virtual_Projects_For --

   -----------------------------------

   procedure Look_For_Virtual_Projects_For

     (Proj                : Project_Node_Id;

      In_Tree             : Project_Node_Tree_Ref;

      Potentially_Virtual : Boolean)

   is

      Declaration : Project_Node_Id := Empty_Node;

      --  Node for the project declaration of Proj

      With_Clause : Project_Node_Id := Empty_Node;

      --  Node for a with clause of Proj

      Imported    : Project_Node_Id := Empty_Node;

      --  Node for a project imported by Proj

      Extended    : Project_Node_Id := Empty_Node;

      --  Node for the eventual project extended by Proj

   begin

      --  Nothing to do if Proj is not defined or if it has already been

      --  processed.

      if Present (Proj) and then not Processed_Hash.Get (Proj) then

         --  Make sure the project will not be processed again

         Processed_Hash.Set (Proj, True);

         Declaration := Project_Declaration_Of (Proj, In_Tree);

         if Present (Declaration) then

            Extended := Extended_Project_Of (Declaration, In_Tree);

         end if;

         --  If this is a project that may need a virtual extending project

         --  and it is not itself an extending project, put it in the list.

         if Potentially_Virtual and then No (Extended) then

            Virtual_Hash.Set (Proj, Proj);

         end if;

         --  Now check the projects it imports

         With_Clause := First_With_Clause_Of (Proj, In_Tree);

         while Present (With_Clause) loop

            Imported := Project_Node_Of (With_Clause, In_Tree);

            if Present (Imported) then

               Look_For_Virtual_Projects_For

                 (Imported, In_Tree, Potentially_Virtual => True);

            end if;

            With_Clause := Next_With_Clause_Of (With_Clause, In_Tree);

         end loop;

         --  Check also the eventual project extended by Proj. As this project

         --  is already extended, call recursively with Potentially_Virtual

         --  being False.

         Look_For_Virtual_Projects_For

           (Extended, In_Tree, Potentially_Virtual => False);

      end if;

   end Look_For_Virtual_Projects_For;

   -----------

   -- Parse --

   -----------

   procedure Parse

     (In_Tree                : Project_Node_Tree_Ref;

      Project                : out Project_Node_Id;

      Project_File_Name      : String;

      Always_Errout_Finalize : Boolean;

      Packages_To_Check      : String_List_Access := All_Packages;

      Store_Comments         : Boolean := False;

      Current_Directory      : String := "";

      Is_Config_File         : Boolean;

      Flags                  : Processing_Flags)

   is

      Dummy : Boolean;

      pragma Warnings (Off, Dummy);

      Real_Project_File_Name : String_Access :=

                                 Osint.To_Canonical_File_Spec

                                   (Project_File_Name);

   begin

      if Real_Project_File_Name = null then

         Real_Project_File_Name := new String'(Project_File_Name);

      end if;

      Project := Empty_Node;

      Projects_Paths.Reset;

      if Current_Verbosity >= Medium then

         Write_Str ("GPR_PROJECT_PATH=""");

         Write_Str (Project_Path (In_Tree));

         Write_Line ("""");

      end if;

      declare

         Path_Name : constant String :=

                       Project_Path_Name_Of (In_Tree,

                                             Real_Project_File_Name.all,

                                             Directory   => Current_Directory);

      begin

         Free (Real_Project_File_Name);

         Prj.Err.Initialize;

         Prj.Err.Scanner.Set_Comment_As_Token (Store_Comments);

         Prj.Err.Scanner.Set_End_Of_Line_As_Token (Store_Comments);

         --  Parse the main project file

         if Path_Name = "" then

            Prj.Com.Fail

              ("project file """

               & Project_File_Name

               & """ not found in "

               & Project_Path (In_Tree));

            Project := Empty_Node;

            return;

         end if;

         begin

            Parse_Single_Project

              (In_Tree           => In_Tree,

               Project           => Project,

               Extends_All       => Dummy,

               Path_Name         => Path_Name,

               Extended          => False,

               From_Extended     => None,

               In_Limited        => False,

               Packages_To_Check => Packages_To_Check,

               Depth             => 0,

               Current_Dir       => Current_Directory,

               Is_Config_File    => Is_Config_File,

               Flags             => Flags);

         exception

            when Types.Unrecoverable_Error =>

               --  Unrecoverable_Error is raised when a line is too long.

               --  A meaningful error message will be displayed later.

               Project := Empty_Node;

         end;

         --  If Project is an extending-all project, create the eventual

         --  virtual extending projects and check that there are no illegally

         --  imported projects.

         if Present (Project)

           and then Is_Extending_All (Project, In_Tree)

         then

            --  First look for projects that potentially need a virtual

            --  extending project.

            Virtual_Hash.Reset;

            Processed_Hash.Reset;

            --  Mark the extending all project as processed, to avoid checking

            --  the imported projects in case of a "limited with" on this

            --  extending all project.

            Processed_Hash.Set (Project, True);

            declare

               Declaration : constant Project_Node_Id :=

                               Project_Declaration_Of (Project, In_Tree);

            begin

               Look_For_Virtual_Projects_For

                 (Extended_Project_Of (Declaration, In_Tree), In_Tree,

                  Potentially_Virtual => False);

            end;

            --  Now, check the projects directly imported by the main project.

            --  Remove from the potentially virtual any project extended by one

            --  of these imported projects. For non extending imported

            --  projects, check that they do not belong to the project tree of

            --  the project being "extended-all" by the main project.

            declare

               With_Clause : Project_Node_Id;

               Imported    : Project_Node_Id := Empty_Node;

               Declaration : Project_Node_Id := Empty_Node;

            begin

               With_Clause := First_With_Clause_Of (Project, In_Tree);

               while Present (With_Clause) loop

                  Imported := Project_Node_Of (With_Clause, In_Tree);

                  if Present (Imported) then

                     Declaration := Project_Declaration_Of (Imported, In_Tree);

                     if Extended_Project_Of (Declaration, In_Tree) /=

                               Empty_Node

                     then

                        loop

                           Imported :=

                             Extended_Project_Of (Declaration, In_Tree);

                           exit when No (Imported);

                           Virtual_Hash.Remove (Imported);

                           Declaration :=

                             Project_Declaration_Of (Imported, In_Tree);

                        end loop;

                     end if;

                  end if;

                  With_Clause := Next_With_Clause_Of (With_Clause, In_Tree);

               end loop;

            end;

            --  Now create all the virtual extending projects

            declare

               Proj : Project_Node_Id := Virtual_Hash.Get_First;

            begin

               while Present (Proj) loop

                  Create_Virtual_Extending_Project (Proj, Project, In_Tree);

                  Proj := Virtual_Hash.Get_Next;

               end loop;

            end;

         end if;

         --  If there were any kind of error during the parsing, serious

         --  or not, then the parsing fails.

         if Err_Vars.Total_Errors_Detected > 0 then

            Project := Empty_Node;

         end if;

         if No (Project) or else Always_Errout_Finalize then

            Prj.Err.Finalize;

            --  Reinitialize to avoid duplicate warnings later on

            Prj.Err.Initialize;

         end if;

      end;

   exception

      when X : others =>

         --  Internal error

         Write_Line (Exception_Information (X));

         Write_Str  ("Exception ");

         Write_Str  (Exception_Name (X));

         Write_Line (" raised, while processing project file");

         Project := Empty_Node;

   end Parse;

   ------------------------------

   -- Pre_Parse_Context_Clause --

   ------------------------------

   procedure Pre_Parse_Context_Clause

     (In_Tree        : Project_Node_Tree_Ref;

      Context_Clause : out With_Id;

      Is_Config_File : Boolean;

      Flags          : Processing_Flags)

   is

      Current_With_Clause : With_Id := No_With;

      Limited_With        : Boolean := False;

      Current_With        : With_Record;

      Current_With_Node   : Project_Node_Id := Empty_Node;

   begin

      --  Assume no context clause

      Context_Clause := No_With;

      With_Loop :

      --  If Token is not WITH or LIMITED, there is no context clause, or we

      --  have exhausted the with clauses.

      while Token = Tok_With or else Token = Tok_Limited loop

         Current_With_Node :=

           Default_Project_Node (Of_Kind => N_With_Clause, In_Tree => In_Tree);

         Limited_With := Token = Tok_Limited;

         if Is_Config_File then

            Error_Msg

              (Flags,

               "configuration project cannot import " &

               "other configuration projects",

               Token_Ptr);

         end if;

         if Limited_With then

            Scan (In_Tree);  --  scan past LIMITED

            Expect (Tok_With, "WITH");

            exit With_Loop when Token /= Tok_With;

         end if;

         Comma_Loop :

         loop

            Scan (In_Tree); -- past WITH or ","

            Expect (Tok_String_Literal, "literal string");

            if Token /= Tok_String_Literal then

               return;

            end if;

            --  Store path and location in table Withs

            Current_With :=

              (Path         => Path_Name_Type (Token_Name),

               Location     => Token_Ptr,

               Limited_With => Limited_With,

               Node         => Current_With_Node,

               Next         => No_With);

            Withs.Increment_Last;

            Withs.Table (Withs.Last) := Current_With;

            if Current_With_Clause = No_With then

               Context_Clause := Withs.Last;

            else

               Withs.Table (Current_With_Clause).Next := Withs.Last;

            end if;

            Current_With_Clause := Withs.Last;

            Scan (In_Tree);

            if Token = Tok_Semicolon then

               Set_End_Of_Line (Current_With_Node);

               Set_Previous_Line_Node (Current_With_Node);

               --  End of (possibly multiple) with clause;

               Scan (In_Tree); -- past the semicolon

               exit Comma_Loop;

            elsif Token = Tok_Comma then

               Set_Is_Not_Last_In_List (Current_With_Node, In_Tree);

            else

               Error_Msg (Flags, "expected comma or semi colon", Token_Ptr);

               exit Comma_Loop;

            end if;

            Current_With_Node :=

              Default_Project_Node

                (Of_Kind => N_With_Clause, In_Tree => In_Tree);

         end loop Comma_Loop;

      end loop With_Loop;

   end Pre_Parse_Context_Clause;

   -------------------------------

   -- Post_Parse_Context_Clause --

   -------------------------------

   procedure Post_Parse_Context_Clause

     (Context_Clause    : With_Id;

      In_Tree           : Project_Node_Tree_Ref;

      Limited_Withs     : Boolean;

      Imported_Projects : in out Project_Node_Id;

      Project_Directory : Path_Name_Type;

      From_Extended     : Extension_Origin;

      In_Limited        : Boolean;

      Packages_To_Check : String_List_Access;

      Depth             : Natural;

      Current_Dir       : String;

      Is_Config_File    : Boolean;

      Flags             : Processing_Flags)

   is

      Current_With_Clause : With_Id := Context_Clause;

      Current_Project  : Project_Node_Id := Imported_Projects;

      Previous_Project : Project_Node_Id := Empty_Node;

      Next_Project     : Project_Node_Id := Empty_Node;

      Project_Directory_Path : constant String :=

                                 Get_Name_String (Project_Directory);

      Current_With : With_Record;

      Extends_All  : Boolean := False;

   begin

      --  Set Current_Project to the last project in the current list, if the

      --  list is not empty.

      if Present (Current_Project) then

         while

           Present (Next_With_Clause_Of (Current_Project, In_Tree))

         loop

            Current_Project := Next_With_Clause_Of (Current_Project, In_Tree);

         end loop;

      end if;

      while Current_With_Clause /= No_With loop

         Current_With := Withs.Table (Current_With_Clause);

         Current_With_Clause := Current_With.Next;

         if Limited_Withs = Current_With.Limited_With then

            declare

               Original_Path : constant String :=

                                 Get_Name_String (Current_With.Path);

               Imported_Path_Name : constant String :=

                                      Project_Path_Name_Of

                                        (In_Tree,

                                         Original_Path,

                                         Project_Directory_Path);

               Resolved_Path : constant String :=

                                 Normalize_Pathname

                                   (Imported_Path_Name,

                                    Directory      => Current_Dir,

                                    Resolve_Links  =>

                                      Opt.Follow_Links_For_Files,

                                    Case_Sensitive => True);

               Withed_Project : Project_Node_Id := Empty_Node;

            begin

               if Imported_Path_Name = "" then

                  --  The project file cannot be found

                  Error_Msg_File_1 := File_Name_Type (Current_With.Path);

                  Error_Msg

                    (Flags, "unknown project file: {", Current_With.Location);

                  --  If this is not imported by the main project file, display

                  --  the import path.

                  if Project_Stack.Last > 1 then

                     for Index in reverse 1 .. Project_Stack.Last loop

                        Error_Msg_File_1 :=

                          File_Name_Type

                            (Project_Stack.Table (Index).Path_Name);

                        Error_Msg

                          (Flags, "\imported by {", Current_With.Location);

                     end loop;

                  end if;

               else

                  --  New with clause

                  Previous_Project := Current_Project;

                  if No (Current_Project) then

                     --  First with clause of the context clause

                     Current_Project := Current_With.Node;

                     Imported_Projects := Current_Project;

                  else