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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                                 S C N G                                  --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 1992-2010, 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.      --

--                                                                          --

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--  This package contains a generic lexical analyzer. This is used for scanning

--  Ada source files or text files with an Ada-like syntax, such as project

--  files. It is instantiated in Scn and Prj.Err.

with Casing; use Casing;

with Styleg;

with Types;  use Types;

generic

   with procedure Post_Scan;

   --  Procedure called by Scan for the following tokens: Tok_Char_Literal,

   --  Tok_Identifier, Tok_Real_Literal, Tok_Real_Literal, Tok_Integer_Literal,

   --  Tok_String_Literal, Tok_Operator_Symbol, and Tok_Vertical_Bar. Used to

   --  build Token_Node and also check for obsolescent features.

   with procedure Error_Msg (Msg : String; Flag_Location : Source_Ptr);

   --  Output a message at specified location

   with procedure Error_Msg_S (Msg : String);

   --  Output a message at current scan pointer location

   with procedure Error_Msg_SC (Msg : String);

   --  Output a message at the start of the current token

   with procedure Error_Msg_SP (Msg : String);

   --  Output a message at the start of the previous token

   with package Style is new Styleg

     (Error_Msg, Error_Msg_S, Error_Msg_SC, Error_Msg_SP);

   --  Instantiation of Styleg with the same error reporting routines

package Scng is

   procedure Initialize_Scanner (Index : Source_File_Index);

   --  Initialize lexical scanner for scanning a new file referenced by Index.

   --  Initialize_Scanner does not call Scan.

   procedure Scan;

   --  Scan scans out the next token, and advances the scan state accordingly

   --  (see package Scan_State for details). If the scan encounters an illegal

   --  token, then an error message is issued pointing to the bad character,

   --  and Scan returns a reasonable substitute token of some kind.

   --  For tokens Char_Literal, Identifier, Real_Literal, Integer_Literal,

   --  String_Literal and Operator_Symbol, Post_Scan is called after scanning.

   function Determine_Token_Casing return Casing_Type;

   pragma Inline (Determine_Token_Casing);

   --  Determines the casing style of the current token, which is

   --  either a keyword or an identifier. See also package Casing.

   procedure Set_Special_Character (C : Character);

   --  Indicate that one of the following character '#', '$', '?', '@', '`',

   --  '\', '^', '_' or '~', when found is a Special token.

   procedure Reset_Special_Characters;

   --  Indicate that there is no characters that are Special tokens., which

   --  is the default.

   procedure Set_End_Of_Line_As_Token (Value : Boolean);

   --  Indicate if End_Of_Line is a token or not.

   --  By default, End_Of_Line is not a token.

   procedure Set_Comment_As_Token (Value : Boolean);

   --  Indicate if a comment is a token or not.

   --  By default, a comment is not a token.

   function Set_Start_Column return Column_Number;

   --  This routine is called with Scan_Ptr pointing to the first character

   --  of a line. On exit, Scan_Ptr is advanced to the first non-blank

   --  character of this line (or to the terminating format effector if the

   --  line contains no non-blank characters), and the returned result is the

   --  column number of this non-blank character (zero origin), which is the

   --  value to be stored in the Start_Column scan variable.

end Scng;