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------------------------------------------------------------------------------
--                                                                          --
--                           OCARINA COMPONENTS                             --
--                                                                          --
--               O C A R I N A . M E _ R E A L . T O K E N S                --
--                                                                          --
--                                 S p e c                                  --
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--          Copyright (C) 2009-2011, European Space Agency (ESA).           --
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--                                                                          --
-- Ocarina  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 2, or (at your option) any      --
-- later version. Ocarina is distributed  in  the  hope  that it will be    --
-- useful, but WITHOUT ANY WARRANTY;  without even the implied warranty of  --
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-- Floor, Boston, MA 02111-1301, USA.                                       --
--                                                                          --
-- As a special exception,  if other files  instantiate  generics from this --
-- unit, or you link  this unit with other files  to produce an executable, --
-- this  unit  does not  by itself cause  the resulting  executable to be   --
-- covered  by the  GNU  General  Public  License. This exception does not  --
-- however invalidate  any other reasons why the executable file might be   --
-- covered by the GNU Public License.                                       --
--                                                                          --
--                 Ocarina is maintained by the Ocarina team                --
--                       (ocarina-users@listes.enst.fr)                     --
--                                                                          --
------------------------------------------------------------------------------

--  Description of REAL tokens

with Types;
with Locations;
with Ocarina.Files;

package Ocarina.ME_REAL.Tokens is
   use Locations;
   use Types;
   use Ocarina.Files;

   type Token_Type is
     (T_Error,
      T_Identifier,
      T_Pragma,

      --  About template types

      T_Sequence,
      T_String,
      T_Wstring,
      T_Fixed,

      --  Graphic characters

      T_Colon,
      T_Colon_Colon,
      T_Comma,
      T_Left_Brace,
      T_Left_Bracket,
      T_Left_Paren,
      T_Right_Brace,
      T_Right_Bracket,
      T_Right_Paren,
      T_Semi_Colon,

      T_Equal,
      T_Not,
      T_And,
      T_Or,
      T_Less_Equal,
      T_Greater_Equal,
      T_Greater,
      T_Less,
      T_Different,
      T_Minus,
      T_Plus,
      T_Star,
      T_Modulo,
      T_Slash,
      T_Power,
      T_Affect,

      --  pre-defined sets

      T_Processor_Set,
      T_Virtual_Processor_Set,
      T_Virtual_Bus_Set,
      T_Process_Set,
      T_Thread_Set,
      T_Threadgroup_Set,
      T_Subprogram_Call_Set,
      T_Sequence_Call_Set,
      T_Subprogram_Set,
      T_Data_Set,
      T_Memory_Set,
      T_Bus_Set,
      T_Connection_Set,
      T_Device_Set,
      T_End_To_End_Flows_Set,
      T_System_Set,
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      T_Abstract_Set,
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      T_Unknown_Set,
      T_Local_Set,

      --  Selection function

      T_Is_Subcomponent_Of,
      T_Is_Bound_To,
      T_Is_Connected_To,
      T_Is_Called_By,
      T_Is_Accessed_By,
      T_Is_Accessing_To,
      T_Is_Passing_Through,
      T_Is_Calling,
      T_Is_Provided_Class,
      T_Is_Predecessor_Of,
      T_Is_Connecting_To,

      --  Verification function

      T_Get_Property_Value,
      T_Get_System_Property_Value,
      T_Cardinal,
      T_First,
      T_Property_Exists,
      T_Last,
      T_Expr,
      T_Size,       --  Size of a list
      T_Float,
      T_List,       --  Build a list from set or enumeration
      T_Head,       --  Return the first node of a list
      T_Queue,      --  Return the list minus  the first node
      T_Integer,
      T_Max,
      T_Min,
      T_Is_In,      --  Checks weither list_1 is included into list_2
      T_LCM,        --  Lowest Common Multiple
      T_GCD,        --  Greatest Common Divisor
      T_Non_Null,   --  N -> [0, 1]
      T_All_Equals,
      T_Product,
      T_Sum,

      --  Ranges set-level functions

      T_MMax,
      T_MProduct,
      T_MMin,
      T_MAll_Equals,
      T_MSum,

      --  Literals

      T_False,
      T_True,
      T_Boolean_Literal,
      T_Integer_Literal,
      T_Fixed_Point_Literal,
      T_Floating_Point_Literal,
      T_Character_Literal,
      T_Wide_Character_Literal,
      T_String_Literal,
      T_Wide_String_Literal,

      --  keywords

      T_Check,
      T_End,
      T_Foreach,
      T_In,
      T_Do,
      T_Sothat,
      T_Requires,
      T_Return,
      T_Var,
      T_Compute,
      T_If,
      T_Then,
      T_Else,
      T_Global,
      T_Theorem,

      T_Anonymous_Set,
      T_EOF);

   First_Token_Pos : constant := Token_Type'Pos (Token_Type'First);
   Last_Token_Pos  : constant := Token_Type'Pos (Token_Type'Last);
   Prefix : constant String := "%real%";

   subtype Literal_Type is Token_Type
     range T_False .. T_Wide_String_Literal;

   subtype Operator_Type is Token_Type
     range T_Equal .. T_Affect;

   subtype Predefined_Sets is Token_Type
     range T_Processor_Set .. T_Local_Set;

   subtype Selection_Function_Type is Token_Type
     range T_Processor_Set .. T_Is_Connecting_To;

   subtype Verification_Function_Type is Token_Type
     range T_Get_Property_Value .. T_Sum;

   subtype Higher_Level_Function_Type is Token_Type
     range T_MMax .. T_MSum;

   subtype Boolean_Operator_Type is Token_Type
     range T_Not .. T_Or;

   subtype Keyword_Type is Token_Type
     range T_Check .. T_Theorem;

   Token_Image : array (Token_Type) of Name_Id;

   ---------------------------------------------------
   -- Global variables updated by the token scanner --
   ---------------------------------------------------

   Token          : Token_Type;
   Token_Name     : Name_Id;
   Token_Location : Location renames Ocarina.Files.Buffer_Location;

   Language       : constant String := "real_specification";
   REAL_Language  : Name_Id;

   procedure Init_Tokens;

   function Image (T : Token_Type) return String;

   function Quoted_Image (T : Token_Type) return String;

   function Is_Literal (T : Token_Type) return Boolean;

   function Is_Operator (T : Token_Type) return Boolean;

   function Is_Set_Operator (T : Token_Type) return Boolean;

   function Is_Predefined_Set (T : Token_Type) return Boolean;

   function Is_Boolean_Operator (T : Token_Type) return Boolean;

   function Is_Scoped_Name (T : Token_Type) return Boolean;

end Ocarina.ME_REAL.Tokens;