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--  VHDL code formatter.
--  Copyright (C) 2019 Tristan Gingold
--
--  This program is free software: you can redistribute it and/or modify
--  it under the terms of the GNU General Public License as published by
--  the Free Software Foundation, either version 2 of the License, or
--  (at your option) any later version.
--
--  This program is distributed in the hope that it will be useful,
--  but WITHOUT 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
--  along with this program.  If not, see <gnu.org/licenses>.

with Ada.Unchecked_Conversion;

with Types; use Types;
with Files_Map;
with Simple_IO;
with Utils_IO;
with Dyn_Tables;
with Flags;

with Vhdl.Tokens; use Vhdl.Tokens;
with Vhdl.Scanner; use Vhdl.Scanner;
with Vhdl.Prints; use Vhdl.Prints;

with Grt.Vstrings;

package body Vhdl.Formatters is
   --  Check token TOK with the one from the scanner.  Deal with irregular
   --  cases.
   procedure Check_Token (Tok : Token_Type) is
   begin
      if Tok = Current_Token then
         return;
      end if;

      --  There are a couple of exceptions.
      --  Range and Subtype are considered as identifiers when used as
      --  attributes.
      if Tok = Tok_Identifier
        and then (Current_Token = Tok_Range
                    or else Current_Token = Tok_Subtype)
      then
         return;
      end if;

      --  'default clock' are considered as identifiers.
      if (Tok = Tok_Default or else Tok = Tok_Psl_Clock)
        and then Current_Token = Tok_Identifier
      then
         return;
      end if;

      declare
         use Simple_IO;
      begin
         Put_Line_Err ("error: token mismatch. ");
         Put_Err ("  need to print: ");
         Put_Err (Image (Tok));
         Put_Err (", but read ");
         Put_Err (Image (Current_Token));
         Put_Err (" from file.");
         New_Line_Err;
      end;
      raise Internal_Error;
   end Check_Token;

   package Format_Disp_Ctxt is
      type Format_Ctxt is new Disp_Ctxt with private;

      procedure Init (Ctxt : out Format_Ctxt;
                      Sfe : Source_File_Entry;
                      First_Line : Positive := 1;
                      Last_Line : Positive := Positive'Last);
      procedure Free (Ctxt : in out Format_Ctxt);

      procedure Start_Hbox (Ctxt : in out Format_Ctxt);
      procedure Close_Hbox (Ctxt : in out Format_Ctxt);
      procedure Start_Vbox (Ctxt : in out Format_Ctxt);
      procedure Close_Vbox (Ctxt : in out Format_Ctxt);
      procedure Valign (Ctxt : in out Format_Ctxt; Point : Valign_Type);
      procedure Disp_Token (Ctxt : in out Format_Ctxt; Tok : Token_Type);
      procedure Start_Lit (Ctxt : in out Format_Ctxt; Tok : Token_Type);
      procedure Disp_Char (Ctxt : in out Format_Ctxt; C : Character);
      procedure Close_Lit (Ctxt : in out Format_Ctxt);

      package Token_Table is new Dyn_Tables
        (Table_Component_Type => Uns32,
         Table_Index_Type => Natural,
         Table_Low_Bound => 1);

      function Get_Source_File_Entry (Ctxt : Format_Ctxt)
                                     return Source_File_Entry;

      subtype Etoken_Type is Nat32 range 0 .. 2**10 - 1;
      subtype Col_Type is Natural range 0 .. 2**16 - 1;

      --  Entry in Token_Table for token TOK with column COL.
      --  Unfortunately it is not possible to pack records with discriminant
      --  with GNAT.  So it is done manually.
      type Etoken_Record is record
         Flag_Token : Boolean;
         Flag1 : Boolean;
         Flag2 : Boolean;
         Flag3 : Boolean;
         Flag4 : Boolean;
         Flag5 : Boolean;
         Tok : Etoken_Type;
         Col : Col_Type;
      end record;
      pragma Pack (Etoken_Record);
      for Etoken_Record'Size use 32;

      type Evalue_Record is record
         Flag_Token : Boolean;
         Value : Nat32;
      end record;
      pragma Pack (Evalue_Record);
      for Evalue_Record'Size use 32;

      Etok_Last : constant Etoken_Type := Token_Type'Pos (Token_Type'Last);
      Etok_Start_Vbox : constant Etoken_Type := Etok_Last + 1;
      Etok_Close_Vbox : constant Etoken_Type := Etok_Last + 2;
      Etok_Set_Vbox   : constant Etoken_Type := Etok_Last + 3;
      Etok_No_Indent  : constant Etoken_Type := Etok_Last + 4;
      Etok_Valign     : constant Etoken_Type := Etok_Last + 5;

      procedure Append_Eof (Ctxt : in out Format_Ctxt);
      procedure Read_Token (Ctxt : Format_Ctxt;
                            Idx : Natural;
                            Tok : out Etoken_Type;
                            Col : out Natural);
      procedure Write_Token (Ctxt : Format_Ctxt;
                             Idx : Natural;
                             Col : Natural);

      --  Token_Source_Type are followed in the stream by two values:
      --    the length of the token (number of characters)
      --    the position in the sources
      --  With these two values, it is possible to print the tokens.

      function Read_Value (Ctxt : Format_Ctxt; Idx : Natural) return Nat32;

      type Printer_Ctxt is abstract tagged null record;
      procedure Put (Ctxt : in out Printer_Ctxt; C : Character) is abstract;
   private
      type Format_Ctxt is new Disp_Ctxt with record
         First_Line : Natural;
         Last_Line : Natural;
         Lineno : Natural;
         Enable : Boolean;
         Flag_Lit : Boolean;
         Vnum : Natural;
         Hnum : Natural;
         Hfirst : Boolean;
         Sfe : Source_File_Entry;
         Toks : Token_Table.Instance;
      end record;
   end Format_Disp_Ctxt;

   package body Format_Disp_Ctxt is
      function To_Etoken_Record is new Ada.Unchecked_Conversion
        (Uns32, Etoken_Record);
      function To_Uns32 is new Ada.Unchecked_Conversion
        (Etoken_Record, Uns32);
      function To_Evalue_Record is new Ada.Unchecked_Conversion
        (Uns32, Evalue_Record);
      function To_Uns32 is new Ada.Unchecked_Conversion
        (Evalue_Record, Uns32);

      procedure Read_Token (Ctxt : Format_Ctxt;
                            Idx : Natural;
                            Tok : out Etoken_Type;
                            Col : out Natural)
      is
         Etok : Etoken_Record;
      begin
         Etok := To_Etoken_Record (Ctxt.Toks.Table (Idx));
         pragma Assert (Etok.Flag_Token);
         Tok := Etok.Tok;
         Col := Etok.Col;
      end Read_Token;

      procedure Write_Token (Ctxt : Format_Ctxt;
                             Idx : Natural;
                             Col : Natural)
      is
         Etok : Etoken_Record;
      begin
         Etok := To_Etoken_Record (Ctxt.Toks.Table (Idx));
         pragma Assert (Etok.Flag_Token);
         Etok.Col := Col;
         Ctxt.Toks.Table (Idx) := To_Uns32 (Etok);
      end Write_Token;

      function Read_Value (Ctxt : Format_Ctxt; Idx : Natural) return Nat32
      is
         V : Evalue_Record;
      begin
         V := To_Evalue_Record (Ctxt.Toks.Table (Idx));
         pragma Assert (not V.Flag_Token);
         return V.Value;
      end Read_Value;

      procedure Append_Token (Ctxt : in out Format_Ctxt;
                              Tok : Etoken_Type;
                              Col : Natural)
      is
         Etok : Etoken_Record;
      begin
         Etok := (Flag_Token => True,
                  Tok => Tok,
                  Col => Col,
                  others => False);
         Token_Table.Append (Ctxt.Toks, To_Uns32 (Etok));
      end Append_Token;

      procedure Append_Token (Ctxt : in out Format_Ctxt; Tok : Token_Type) is
      begin
         Append_Token (Ctxt, Token_Type'Pos (Tok), Get_Token_Offset + 1);
      end Append_Token;

      procedure Append_Value (Ctxt : in out Format_Ctxt;
                              Val : Nat32)
      is
         V : Evalue_Record;
      begin
         V := (Flag_Token => False,
               Value => Val);
         Token_Table.Append (Ctxt.Toks, To_Uns32 (V));
      end Append_Value;

      procedure Append_Source_Token (Ctxt : in out Format_Ctxt;
                                     Tok : Token_Type) is
      begin
         Append_Token (Ctxt, Token_Type'Pos (Tok), Get_Token_Offset + 1);
         Append_Value (Ctxt, Get_Token_Length);
         Append_Value (Ctxt, Nat32 (Get_Token_Position));
      end Append_Source_Token;

      procedure Append_Eof (Ctxt : in out Format_Ctxt) is
      begin
         Append_Token (Ctxt, Token_Type'Pos (Tok_Eof), 0);
      end Append_Eof;

      procedure Init (Ctxt : out Format_Ctxt;
                      Sfe : Source_File_Entry;
                      First_Line : Positive := 1;
                      Last_Line : Positive := Positive'Last) is
      begin
         Ctxt := (First_Line => First_Line,
                  Last_Line => Last_Line,
                  Lineno => 1,
                  Enable => First_Line = 1,
                  Flag_Lit => False,
                  Vnum => 0,
                  Hnum => 0,
                  Hfirst => True,
                  Sfe => Sfe,
                  Toks => <>);