------------------------------------------------------------------------------
--                                                                          --
--                           GPR PROJECT MANAGER                            --
--                                                                          --
--          Copyright (C) 2001-2016, Free Software Foundation, Inc.         --
--                                                                          --
-- This library is free software;  you can redistribute it and/or modify it --
-- under terms of the  GNU General Public License  as published by the Free --
-- Software  Foundation;  either version 3,  or (at your  option) any later --
-- version. This library is distributed in the hope that it will be useful, --
-- but WITHOUT ANY WARRANTY;  without even the implied warranty of MERCHAN- --
-- TABILITY or FITNESS FOR A PARTICULAR PURPOSE.                            --
--                                                                          --
--                                                                          --
--                                                                          --
--                                                                          --
--                                                                          --
-- You should have received a copy of the GNU General Public License and    --
-- a copy of the GCC Runtime Library Exception along with this program;     --
-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
-- <http://www.gnu.org/licenses/>.                                          --
--                                                                          --
------------------------------------------------------------------------------

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

with GPR.Names;  use GPR.Names;
with GPR.Output; use GPR.Output;
with GPR.Snames;

package body GPR.PP is

   use GPR.Tree;

   Not_Tested : array (Project_Node_Kind) of Boolean := (others => True);

   procedure Indicate_Tested (Kind : Project_Node_Kind);
   --  Set the corresponding component of array Not_Tested to False. Only
   --  called by Debug pragmas.

   procedure Write_Char_Default (C : Character);
   procedure Write_Str_Default (S : String);
   procedure Write_Eol_Default;

   ---------------------
   -- Indicate_Tested --
   ---------------------

   procedure Indicate_Tested (Kind : Project_Node_Kind) is
   begin
      Not_Tested (Kind) := False;
   end Indicate_Tested;

   ------------------
   -- Pretty_Print --
   ------------------

   procedure Pretty_Print
     (Project                            : GPR.Project_Node_Id;
      In_Tree                            : GPR.Tree.Project_Node_Tree_Ref;
      Increment                          : Positive       := 3;
      Eliminate_Empty_Case_Constructions : Boolean        := False;
      Minimize_Empty_Lines               : Boolean        := False;
      W_Char                             : Write_Char_Ap  := null;
      W_Eol                              : Write_Eol_Ap   := null;
      W_Str                              : Write_Str_Ap   := null;
      Backward_Compatibility             : Boolean;
      Id                                 : GPR.Project_Id :=
                                             GPR.No_Project;
      Max_Line_Length                    : Max_Length_Of_Line :=
                                             Max_Length_Of_Line'Last;
      Initial_Indent                     : Natural := 0)
   is
      procedure Print (Node : Project_Node_Id; Indent : Natural);
      --  A recursive procedure that traverses a project file tree and outputs
      --  its source. Current_Prj is the project that we are printing. This
      --  is used when printing attributes, since in nested packages they
      --  need to use a fully qualified name.

      procedure Output_Attribute_Name (Name : Name_Id; Indent : Natural);
      --  Outputs an attribute name, taking into account the value of
      --  Backward_Compatibility.

      procedure Output_Name
        (Name       : Name_Id;
         Indent     : Natural;
         Capitalize : Boolean := True);
      --  Outputs a name

      procedure Start_Line (Indent : Natural);
      --  Outputs the indentation at the beginning of the line

      procedure Output_Project_File (S : Name_Id);
      --  Output a project file name in one single string literal

      procedure Output_String
        (S           : Name_Id;
         Indent      : Natural;
         Single_Line : Boolean := False);
      --  Outputs a string using the default output procedures. If Single_Line
      --  is True, do not split the string on several lines.

      procedure Write_Empty_Line (Always : Boolean := False);
      --  Outputs an empty line, only if the previous line was not empty
      --  already and either Always is True or Minimize_Empty_Lines is False.

      procedure Write_Line (S : String);
      --  Outputs S followed by a new line

      procedure Write_String
        (S         : String;
         Indent    : Natural;
         Truncated : Boolean := False);
      --  Outputs S using Write_Str, starting a new line if line would become
      --  too long, when Truncated = False. When Truncated = True, only the
      --  part of the string that can fit on the line is output.

      procedure Write_End_Of_Line_Comment (Node : Project_Node_Id);
      --  Needs comment???

      Write_Char : Write_Char_Ap := Write_Char_Default'Access;
      Write_Eol  : Write_Eol_Ap := Write_Eol_Default'Access;
      Write_Str  : Write_Str_Ap := Write_Str_Default'Access;
      --  These three access to procedure values are used for the output

      Last_Line_Is_Empty : Boolean := False;
      --  Used to avoid two consecutive empty lines

      Column : Natural := 0;
      --  Column number of the last character in the line. Used to avoid
      --  outputting lines longer than Max_Line_Length.

      First_With_In_List : Boolean := True;
      --  Indicate that the next with clause is first in a list such as
      --    with "A", "B";
      --  First_With_In_List will be True for "A", but not for "B".

      ---------------------------
      -- Output_Attribute_Name --
      ---------------------------

      procedure Output_Attribute_Name (Name : Name_Id; Indent : Natural) is
      begin
         if Backward_Compatibility then
            if Name = Snames.Name_Spec then
               Output_Name (Snames.Name_Specification, Indent);

            elsif Name = Snames.Name_Spec_Suffix then
               Output_Name (Snames.Name_Specification_Suffix, Indent);

            elsif Name = Snames.Name_Body then
               Output_Name (Snames.Name_Implementation, Indent);

            elsif Name = Snames.Name_Body_Suffix then
               Output_Name (Snames.Name_Implementation_Suffix, Indent);

            else
               Output_Name (Name, Indent);
            end if;

         else
            Output_Name (Name, Indent);
         end if;
      end Output_Attribute_Name;

      -----------------
      -- Output_Name --
      -----------------

      procedure Output_Name
        (Name       : Name_Id;
         Indent     : Natural;
         Capitalize : Boolean := True)
      is
         Capital : Boolean := Capitalize;

      begin
         if Column = 0 and then Indent /= 0 then
            Start_Line (Indent + Increment);
         end if;

         Get_Name_String (Name);

         --  If line would become too long, create new line

         if Column + Name_Len > Max_Line_Length then
            Write_Eol.all;
            Column := 0;

            if Indent /= 0 then
               Start_Line (Indent + Increment);
            end if;
         end if;

         for J in 1 .. Name_Len loop
            if Capital then
               Write_Char (To_Upper (Name_Buffer (J)));
            else
               Write_Char (Name_Buffer (J));
            end if;

            if Capitalize then
               Capital :=
                 Name_Buffer (J) = '_'
                 or else Is_Digit (Name_Buffer (J));
            end if;
         end loop;

         Column := Column + Name_Len;
      end Output_Name;

      -------------------------
      -- Output_Project_File --
      -------------------------

      procedure Output_Project_File (S : Name_Id) is
         File_Name : constant String := Get_Name_String (S);

      begin
         Write_Char ('"');

         for J in File_Name'Range loop
            if File_Name (J) = '"' then
               Write_Char ('"');
               Write_Char ('"');
            else
               Write_Char (File_Name (J));
            end if;
         end loop;

         Write_Char ('"');
      end Output_Project_File;

      -------------------
      -- Output_String --
      -------------------

      procedure Output_String
        (S           : Name_Id;
         Indent      : Natural;
         Single_Line : Boolean := False)
      is
      begin
         if Column = 0 and then Indent /= 0 then
            Start_Line (Indent + Increment);
         end if;

         Get_Name_String (S);

         --  If line could become too long, create new line. Note that the
         --  number of characters on the line could be twice the number of
         --  character in the string (if every character is a '"') plus two
         --  (the initial and final '"').

         if Column + Name_Len + Name_Len + 2 > Max_Line_Length then
            Write_Eol.all;
            Column := 0;

            if Indent /= 0 then
               Start_Line (Indent + Increment);
            end if;
         end if;

         Write_Char ('"');
         Column := Column + 1;
         Get_Name_String (S);

         for J in 1 .. Name_Len loop
            if Name_Buffer (J) = '"' then
               Write_Char ('"');
               Write_Char ('"');
               Column := Column + 2;
            else
               Write_Char (Name_Buffer (J));
               Column := Column + 1;
            end if;

            --  If the string does not fit on one line, cut it in parts and
            --  concatenate.

            if (not Single_Line) and then
               J < Name_Len and then
               Column >= Max_Line_Length
            then
               Write_Str (""" &");
               Write_Eol.all;
               Column := 0;
               Start_Line (Indent + Increment);
               Write_Char ('"');
               Column := Column + 1;
            end if;
         end loop;

         Write_Char ('"');
         Column := Column + 1;
      end Output_String;

      ----------------
      -- Start_Line --
      ----------------

      procedure Start_Line (Indent : Natural) is
      begin
         if not Minimize_Empty_Lines then
            Write_Str ((1 .. Indent => ' '));
            Column := Column + Indent;
         end if;
      end Start_Line;

      ----------------------
      -- Write_Empty_Line --
      ----------------------

      procedure Write_Empty_Line (Always : Boolean := False) is
      begin
         if (Always or else not Minimize_Empty_Lines)
           and then not Last_Line_Is_Empty
         then
            Write_Eol.all;
            Column := 0;
            Last_Line_Is_Empty := True;
         end if;
      end Write_Empty_Line;

      -------------------------------
      -- Write_End_Of_Line_Comment --
      -------------------------------

      procedure Write_End_Of_Line_Comment (Node : Project_Node_Id) is
         Value : constant Name_Id := End_Of_Line_Comment (Node, In_Tree);

      begin
         if Value /= No_Name then
            Write_String (" --", 0);
            Write_String (Get_Name_String (Value), 0, Truncated => True);
         end if;

         Write_Line ("");
      end Write_End_Of_Line_Comment;

      ----------------
      -- Write_Line --
      ----------------

      procedure Write_Line (S : String) is
      begin
         Write_String (S, 0);
         Last_Line_Is_Empty := False;
         Write_Eol.all;
         Column := 0;
      end Write_Line;

      ------------------
      -- Write_String --
      ------------------

      procedure Write_String
        (S         : String;
         Indent    : Natural;
         Truncated : Boolean := False)
      is
         Length : Natural := S'Length;

      begin
         if Column = 0 and then Indent /= 0 then
            Start_Line (Indent + Increment);
         end if;

         --  If the string would not fit on the line, start a new line

         if Column + Length > Max_Line_Length then
            if Truncated then
               Length := Max_Line_Length - Column;

            else
               Write_Eol.all;
               Column := 0;

               if Indent /= 0 then
                  Start_Line (Indent + Increment);
               end if;
            end if;
         end if;

         Write_Str (S (S'First .. S'First + Length - 1));
         Column := Column + Length;
      end Write_String;

      -----------
      -- Print --
      -----------

      procedure Print (Node : Project_Node_Id; Indent : Natural) is
      begin
         if Present (Node) then
            case Kind_Of (Node, In_Tree) is
               when N_Project  =>
                  pragma Debug (Indicate_Tested (N_Project));
                  if Present (First_With_Clause_Of (Node, In_Tree)) then

                     --  with clause(s)

                     First_With_In_List := True;
                     Print (First_With_Clause_Of (Node, In_Tree), Indent);
                     Write_Empty_Line (Always => True);
                  end if;

                  Print (First_Comment_Before (Node, In_Tree), Indent);
                  Start_Line (Indent);

                  case Project_Qualifier_Of (Node, In_Tree) is
                     when Unspecified | Standard =>
                        null;
                     when Aggregate   =>
                        Write_String ("aggregate ", Indent);
                     when Aggregate_Library =>
                        Write_String ("aggregate library ", Indent);
                     when Library     =>
                        Write_String ("library ", Indent);
                     when Configuration =>
                        Write_String ("configuration ", Indent);
                     when Abstract_Project =>
                        Write_String ("abstract ", Indent);
                  end case;

                  Write_String ("project ", Indent);

                  if Id /= GPR.No_Project then
                     Output_Name (Id.Display_Name, Indent);
                  else
                     Output_Name (Name_Of (Node, In_Tree), Indent);
                  end if;

                  --  Check if this project extends another project

                  if Extended_Project_Path_Of (Node, In_Tree) /= No_Path then
                     Write_String (" extends ", Indent);

                     if Is_Extending_All (Node, In_Tree) then
                        Write_String ("all ", Indent);
                     end if;

                     Output_Project_File
                       (Name_Id (Extended_Project_Path_Of (Node, In_Tree)));
                  end if;

                  Write_String (" is", Indent);
                  Write_End_Of_Line_Comment (Node);
                  Print
                    (First_Comment_After (Node, In_Tree), Indent + Increment);
                  Write_Empty_Line (Always => True);

                  --  Output all of the declarations in the project

                  Print (Project_Declaration_Of (Node, In_Tree), Indent);
                  Print
                    (First_Comment_Before_End (Node, In_Tree),
                     Indent + Increment);
                  Start_Line (Indent);
                  Write_String ("end ", Indent);

                  if Id /= GPR.No_Project then
                     Output_Name (Id.Display_Name, Indent);
                  else
                     Output_Name (Name_Of (Node, In_Tree), Indent);
                  end if;

                  Write_Line (";");
                  Print (First_Comment_After_End (Node, In_Tree), Indent);

               when N_With_Clause =>
                  pragma Debug (Indicate_Tested (N_With_Clause));

                  --  The with clause will sometimes contain an invalid name
                  --  when we are importing a virtual project from an extending
                  --  all project. Do not output anything in this case.

                  if Name_Of (Node, In_Tree) /= No_Name
                    and then String_Value_Of (Node, In_Tree) /= No_Name
                  then
                     if First_With_In_List then
                        Print (First_Comment_Before (Node, In_Tree), Indent);
                        Start_Line (Indent);

                        if Non_Limited_Project_Node_Of (Node, In_Tree) =
                             Empty_Project_Node
                        then
                           Write_String ("limited ", Indent);
                        end if;

                        Write_String ("with ", Indent);
                     end if;

                     --  Output the project name without concatenation, even if
                     --  the line is too long.

                     Output_Project_File (String_Value_Of (Node, In_Tree));

                     if Is_Not_Last_In_List (Node, In_Tree) then
                        Write_String (", ", Indent);
                        First_With_In_List := False;

                     else
                        Write_String (";", Indent);
                        Write_End_Of_Line_Comment (Node);
                        Print (First_Comment_After (Node, In_Tree), Indent);
                        First_With_In_List := True;
                     end if;
                  end if;

                  Print (Next_With_Clause_Of (Node, In_Tree), Indent);

               when N_Project_Declaration =>
                  pragma Debug (Indicate_Tested (N_Project_Declaration));

                  if
                    Present (First_Declarative_Item_Of (Node, In_Tree))
                  then
                     Print
                       (First_Declarative_Item_Of (Node, In_Tree),
                        Indent + Increment);
                     Write_Empty_Line (Always => True);
                  end if;

               when N_Declarative_Item =>
                  pragma Debug (Indicate_Tested (N_Declarative_Item));
                  Print (Current_Item_Node (Node, In_Tree), Indent);
                  Print (Next_Declarative_Item (Node, In_Tree), Indent);

               when N_Package_Declaration =>
                  pragma Debug (Indicate_Tested (N_Package_Declaration));
                  Write_Empty_Line (Always => True);
                  Print (First_Comment_Before (Node, In_Tree), Indent);
                  Start_Line (Indent);
                  Write_String ("package ", Indent);
                  Output_Name (Name_Of (Node, In_Tree), Indent);

                  if Project_Of_Renamed_Package_Of (Node, In_Tree) /=
                       Empty_Project_Node
                  then
                     if First_Declarative_Item_Of (Node, In_Tree) =
                          Empty_Project_Node
                     then
                        Write_String (" renames ", Indent);
                     else
                        Write_String (" extends ", Indent);
                     end if;

                     Output_Name
                       (Name_Of
                          (Project_Of_Renamed_Package_Of (Node, In_Tree),
                           In_Tree),
                        Indent);
                     Write_String (".", Indent);
                     Output_Name (Name_Of (Node, In_Tree), Indent);
                  end if;

                  if Project_Of_Renamed_Package_Of (Node, In_Tree) /=
                       Empty_Project_Node
                    and then
                     First_Declarative_Item_Of (Node, In_Tree) =
                       Empty_Project_Node
                  then
                     Write_String (";", Indent);
                     Write_End_Of_Line_Comment (Node);
                     Print (First_Comment_After_End (Node, In_Tree), Indent);

                  else
                     Write_String (" is", Indent);
                     Write_End_Of_Line_Comment (Node);
                     Print (First_Comment_After (Node, In_Tree),
                            Indent + Increment);

                     if First_Declarative_Item_Of (Node, In_Tree) /=
                       Empty_Project_Node
                     then
                        Print
                          (First_Declarative_Item_Of (Node, In_Tree),
                           Indent + Increment);
                     end if;

                     Print (First_Comment_Before_End (Node, In_Tree),
                            Indent + Increment);
                     Start_Line (Indent);
                     Write_String ("end ", Indent);
                     Output_Name (Name_Of (Node, In_Tree), Indent);
                     Write_Line (";");
                     Print (First_Comment_After_End (Node, In_Tree), Indent);
                     Write_Empty_Line;
                  end if;

               when N_String_Type_Declaration =>
                  pragma Debug (Indicate_Tested (N_String_Type_Declaration));
                  Print (First_Comment_Before (Node, In_Tree), Indent);
                  Start_Line (Indent);
                  Write_String ("type ", Indent);
                  Output_Name (Name_Of (Node, In_Tree), Indent);
                  Write_Line (" is");
                  Start_Line (Indent + Increment);
                  Write_String ("(", Indent);

                  declare
                     String_Node : Project_Node_Id :=
                       First_Literal_String (Node, In_Tree);

                  begin
                     while Present (String_Node) loop
                        Output_String
                          (String_Value_Of (String_Node, In_Tree),
                           Indent,
                           Single_Line => True);
                        String_Node :=
                          Next_Literal_String (String_Node, In_Tree);

                        if Present (String_Node) then
                           Write_String (", ", Indent);
                        end if;
                     end loop;
                  end;

                  Write_String (");", Indent);
                  Write_End_Of_Line_Comment (Node);
                  Print (First_Comment_After (Node, In_Tree), Indent);

               when N_Literal_String =>
                  pragma Debug (Indicate_Tested (N_Literal_String));
                  Output_String (String_Value_Of (Node, In_Tree), Indent);

                  if Source_Index_Of (Node, In_Tree) /= 0 then
                     Write_String (" at", Indent);
                     Write_String
                       (Source_Index_Of (Node, In_Tree)'Img, Indent);
                  end if;

               when N_Attribute_Declaration =>
                  pragma Debug (Indicate_Tested (N_Attribute_Declaration));
                  Print (First_Comment_Before (Node, In_Tree), Indent);
                  Start_Line (Indent);
                  Write_String ("for ", Indent);
                  Output_Attribute_Name (Name_Of (Node, In_Tree), Indent);

                  if Associative_Array_Index_Of (Node, In_Tree) /= No_Name then
                     Write_String (" (", Indent);
                     Output_String
                       (Associative_Array_Index_Of (Node, In_Tree),
                        Indent,
                        Single_Line => True);

                     if Source_Index_Of (Node, In_Tree) /= 0 then
                        Write_String (" at", Indent);
                        Write_String
                          (Source_Index_Of (Node, In_Tree)'Img, Indent);
                     end if;

                     Write_String (")", Indent);
                  end if;

                  Write_String (" use ", Indent);

                  if Present (Expression_Of (Node, In_Tree)) then
                     Print (Expression_Of (Node, In_Tree), Indent);

                  else
                     --  Full associative array declaration

                     if Present (Associative_Project_Of (Node, In_Tree)) then
                        Output_Name
                          (Name_Of
                             (Associative_Project_Of (Node, In_Tree),
                              In_Tree),
                           Indent);

                        if Present (Associative_Package_Of (Node, In_Tree))
                        then
                           Write_String (".", Indent);
                           Output_Name
                             (Name_Of
                                (Associative_Package_Of (Node, In_Tree),
                                 In_Tree),
                              Indent);
                        end if;

                     elsif Present (Associative_Package_Of (Node, In_Tree))
                     then
                        Output_Name
                          (Name_Of
                             (Associative_Package_Of (Node, In_Tree),
                              In_Tree),
                           Indent);
                     end if;

                     Write_String ("'", Indent);
                     Output_Attribute_Name (Name_Of (Node, In_Tree), Indent);
                  end if;

                  Write_String (";", Indent);
                  Write_End_Of_Line_Comment (Node);
                  Print (First_Comment_After (Node, In_Tree), Indent);

               when N_Typed_Variable_Declaration =>
                  declare
                     Type_Node : constant Project_Node_Id :=
                       String_Type_Of (Node, In_Tree);
                     Type_Project : constant Project_Node_Id :=
                       Project_Node_Of (Type_Node, In_Tree);
                  begin
                     pragma Debug
                       (Indicate_Tested (N_Typed_Variable_Declaration));
                     Print (First_Comment_Before (Node, In_Tree), Indent);
                     Start_Line (Indent);
                     Output_Name (Name_Of (Node, In_Tree), Indent);
                     Write_String (" : ", Indent);

                     if Project_Node_Of (Node, In_Tree) /= Empty_Project_Node
                         and then
                        Project_Node_Of (Node, In_Tree) /= Type_Project
                     then
                        Output_Name (Name_Of (Type_Project, In_Tree), Indent);
                        Write_Char ('.');
                     end if;

                     Output_Name (Name_Of (Type_Node, In_Tree), Indent);
                     Write_String (" := ", Indent);
                     Print (Expression_Of (Node, In_Tree), Indent);
                     Write_String (";", Indent);
                     Write_End_Of_Line_Comment (Node);
                     Print (First_Comment_After (Node, In_Tree), Indent);
                  end;

               when N_Variable_Declaration =>
                  pragma Debug (Indicate_Tested (N_Variable_Declaration));
                  Print (First_Comment_Before (Node, In_Tree), Indent);
                  Start_Line (Indent);
                  Output_Name (Name_Of (Node, In_Tree), Indent);
                  Write_String (" := ", Indent);
                  Print (Expression_Of (Node, In_Tree), Indent);
                  Write_String (";", Indent);
                  Write_End_Of_Line_Comment (Node);
                  Print (First_Comment_After (Node, In_Tree), Indent);

               when N_Expression =>
                  pragma Debug (Indicate_Tested (N_Expression));
                  declare
                     Term : Project_Node_Id := First_Term (Node, In_Tree);

                  begin
                     while Present (Term) loop
                        Print (Term, Indent);
                        Term := Next_Term (Term, In_Tree);

                        if Present (Term) then
                           Write_String (" & ", Indent);
                        end if;
                     end loop;
                  end;

               when N_Term =>
                  pragma Debug (Indicate_Tested (N_Term));
                  Print (Current_Term (Node, In_Tree), Indent);

               when N_Literal_String_List =>
                  pragma Debug (Indicate_Tested (N_Literal_String_List));
                  Write_String ("(", Indent);

                  declare
                     Expression : Project_Node_Id :=
                                    First_Expression_In_List (Node, In_Tree);

                  begin
                     while Present (Expression) loop
                        Print (Expression, Indent);
                        Expression :=
                          Next_Expression_In_List (Expression, In_Tree);

                        if Present (Expression) then
                           Write_String (", ", Indent);
                        end if;
                     end loop;
                  end;

                  Write_String (")", Indent);

               when N_Variable_Reference =>
                  pragma Debug (Indicate_Tested (N_Variable_Reference));
                  if Present (Project_Node_Of (Node, In_Tree)) then
                     Output_Name
                       (Name_Of (Project_Node_Of (Node, In_Tree), In_Tree),
                        Indent);
                     Write_String (".", Indent);
                  end if;

                  if Present (Package_Node_Of (Node, In_Tree)) then
                     Output_Name
                       (Name_Of (Package_Node_Of (Node, In_Tree), In_Tree),
                        Indent);
                     Write_String (".", Indent);
                  end if;

                  Output_Name (Name_Of (Node, In_Tree), Indent);

               when N_External_Value =>
                  pragma Debug (Indicate_Tested (N_External_Value));
                  Write_String ("external (", Indent);
                  Print (External_Reference_Of (Node, In_Tree), Indent);

                  if Present (External_Default_Of (Node, In_Tree)) then
                     Write_String (", ", Indent);
                     Print (External_Default_Of (Node, In_Tree), Indent);
                  end if;

                  Write_String (")", Indent);

               when N_Split =>
                  pragma Debug (Indicate_Tested (N_Split));
                  Write_String ("split (", Indent);

                  Print (String_Argument_Of (Node, In_Tree), Indent);
                  Write_String (", ", Indent);
                  Print (Separator_Of (Node, In_Tree), Indent);

                  Write_String (")", Indent);

               when N_Attribute_Reference =>
                  pragma Debug (Indicate_Tested (N_Attribute_Reference));

                  if Present (Project_Node_Of (Node, In_Tree))
                    and then Project_Node_Of (Node, In_Tree) /= Project
                  then
                     Output_Name
                       (Name_Of (Project_Node_Of (Node, In_Tree), In_Tree),
                        Indent);

                     if Present (Package_Node_Of (Node, In_Tree)) then
                        Write_String (".", Indent);
                        Output_Name
                          (Name_Of (Package_Node_Of (Node, In_Tree), In_Tree),
                           Indent);
                     end if;

                  elsif Present (Package_Node_Of (Node, In_Tree)) then
                     Output_Name
                       (Name_Of (Package_Node_Of (Node, In_Tree), In_Tree),
                        Indent);

                  else
                     Write_String ("project", Indent);
                  end if;

                  Write_String ("'", Indent);
                  Output_Attribute_Name (Name_Of (Node, In_Tree), Indent);

                  declare
                     Index : constant Name_Id :=
                               Associative_Array_Index_Of (Node, In_Tree);
                  begin
                     if Index /= No_Name then
                        Write_String (" (", Indent);
                        Output_String (Index, Indent, Single_Line => True);
                        Write_String (")", Indent);
                     end if;
                  end;

               when N_Case_Construction =>
                  pragma Debug (Indicate_Tested (N_Case_Construction));

                  declare
                     Case_Item    : Project_Node_Id;
                     Is_Non_Empty : Boolean := False;

                  begin
                     Case_Item := First_Case_Item_Of (Node, In_Tree);
                     while Present (Case_Item) loop
                        if Present
                            (First_Declarative_Item_Of (Case_Item, In_Tree))
                          or else not Eliminate_Empty_Case_Constructions
                        then
                           Is_Non_Empty := True;
                           exit;
                        end if;

                        Case_Item := Next_Case_Item (Case_Item, In_Tree);
                     end loop;

                     if Is_Non_Empty then
                        Write_Empty_Line;
                        Print (First_Comment_Before (Node, In_Tree), Indent);
                        Start_Line (Indent);
                        Write_String ("case ", Indent);
                        Print
                          (Case_Variable_Reference_Of (Node, In_Tree), Indent);
                        Write_String (" is", Indent);
                        Write_End_Of_Line_Comment (Node);
                        Print
                          (First_Comment_After (Node, In_Tree),
                           Indent + Increment);

                        declare
                           Case_Item : Project_Node_Id :=
                                         First_Case_Item_Of (Node, In_Tree);
                        begin
                           while Present (Case_Item) loop
                              pragma Assert
                                (Kind_Of (Case_Item, In_Tree) = N_Case_Item);
                              Print (Case_Item, Indent + Increment);
                              Case_Item :=
                                Next_Case_Item (Case_Item, In_Tree);
                           end loop;
                        end;

                        Print (First_Comment_Before_End (Node, In_Tree),
                               Indent + Increment);
                        Start_Line (Indent);
                        Write_Line ("end case;");
                        Print
                          (First_Comment_After_End (Node, In_Tree), Indent);
                     end if;
                  end;

               when N_Case_Item =>
                  pragma Debug (Indicate_Tested (N_Case_Item));

                  if Present (First_Declarative_Item_Of (Node, In_Tree))
                    or else not Eliminate_Empty_Case_Constructions
                  then
                     Write_Empty_Line;
                     Print (First_Comment_Before (Node, In_Tree), Indent);
                     Start_Line (Indent);
                     Write_String ("when ", Indent);

                     if No (First_Choice_Of (Node, In_Tree)) then
                        Write_String ("others", Indent);

                     else
                        declare
                           Label : Project_Node_Id :=
                                     First_Choice_Of (Node, In_Tree);

                        begin
                           while Present (Label) loop
                              Print (Label, Indent);
                              Label := Next_Literal_String (Label, In_Tree);

                              if Present (Label) then
                                 Write_String (" | ", Indent);
                              end if;
                           end loop;
                        end;
                     end if;

                     Write_String (" =>", Indent);
                     Write_End_Of_Line_Comment (Node);
                     Print
                       (First_Comment_After (Node, In_Tree),
                        Indent + Increment);

                     declare
                        First : constant Project_Node_Id :=
                                  First_Declarative_Item_Of (Node, In_Tree);
                     begin
                        if No (First) then
                           Write_Empty_Line;
                        else
                           Print (First, Indent + Increment);
                        end if;
                     end;
                  end if;

               when N_Comment_Zones =>

               --  Nothing to do, because it will not be processed directly

                  null;

               when N_Comment =>
                  pragma Debug (Indicate_Tested (N_Comment));

                  if Follows_Empty_Line (Node, In_Tree) then
                     Write_Empty_Line;
                  end if;

                  Start_Line (Indent);
                  Write_String ("--", Indent);
                  Write_String
                    (Get_Name_String (String_Value_Of (Node, In_Tree)),
                     Indent,
                     Truncated => True);
                  Write_Line ("");

                  if Is_Followed_By_Empty_Line (Node, In_Tree) then
                     Write_Empty_Line;
                  end if;

                  Print (Next_Comment (Node, In_Tree), Indent);
            end case;
         end if;
      end Print;

   --  Start of processing for Pretty_Print

   begin
      if W_Char = null then
         Write_Char := Write_Char_Default'Access;
      else
         Write_Char := W_Char;
      end if;

      if W_Eol = null then
         Write_Eol := Write_Eol_Default'Access;
      else
         Write_Eol := W_Eol;
      end if;

      if W_Str = null then
         Write_Str := Write_Str_Default'Access;
      else
         Write_Str := W_Str;
      end if;

      Print (Project, Initial_Indent);
   end Pretty_Print;

   -----------------------
   -- Output_Statistics --
   -----------------------

   procedure Output_Statistics is
   begin
      Write_Line ("Project_Node_Kinds not tested:");

      for Kind in Project_Node_Kind loop
         if Kind /= N_Comment_Zones and then Not_Tested (Kind) then
            Write_Str ("   ");
            Write_Line (Project_Node_Kind'Image (Kind));
         end if;
      end loop;

      Write_Eol;
   end Output_Statistics;

   ---------
   -- wpr --
   ---------

   procedure wpr
     (Project : GPR.Project_Node_Id;
      In_Tree : GPR.Tree.Project_Node_Tree_Ref)
   is
   begin
      Pretty_Print (Project, In_Tree, Backward_Compatibility => False);
   end wpr;

   ------------------------
   -- Write_Char_Default --
   ------------------------

   procedure Write_Char_Default (C : Character) is
   begin
      Write_Char (C);
   end Write_Char_Default;

   -----------------------
   -- Write_Str_Default --
   -----------------------

   procedure Write_Str_Default (S : String) is
   begin
      Write_Str (S);
   end Write_Str_Default;

   -----------------------
   -- Write_Eol_Default --
   -----------------------

   procedure Write_Eol_Default is
   begin
      Write_Eol;
   end Write_Eol_Default;

end GPR.PP;
