------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S C N -- -- -- -- S p e c -- -- -- -- Copyright (C) 1992-2004 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 2, 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 COPYING. If not, write -- -- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, -- -- MA 02111-1307, USA. -- -- -- -- GNAT was originally developed by the GNAT team at New York University. -- -- Extensive contributions were provided by Ada Core Technologies Inc. -- -- -- ------------------------------------------------------------------------------ -- This package contains the lexical analyzer routines. This is used by the -- compiler for scanning Ada source files. with Casing; use Casing; with Errout; use Errout; with Scng; with Style; use Style; with Types; use Types; package Scn is procedure Initialize_Scanner (Unit : Unit_Number_Type; Index : Source_File_Index); -- Initialize lexical scanner for scanning a new file. The caller has -- completed the construction of the Units.Table entry for the specified -- Unit and Index references the corresponding source file. A special -- case is when Unit = No_Unit_Number, and Index corresponds to the -- source index for reading the configuration pragma file. function Determine_Token_Casing return Casing_Type; -- Determines the casing style of the current token, which is -- either a keyword or an identifier. See also package Casing. procedure Obsolescent_Check (S : Source_Ptr); -- Called to handle pragma restrictions check for usage of obsolescent -- character replacements during the scan. procedure Post_Scan; pragma Inline (Post_Scan); -- Create nodes for tokens: Char_Literal, Identifier, Real_Literal, -- Integer_Literal, String_Literal and Operator_Symbol. procedure Scan_Reserved_Identifier (Force_Msg : Boolean); -- This procedure is called to convert the current token, which the caller -- has checked is for a reserved word, to an equivalent identifier. This is -- of course only used in error situations where the parser can detect that -- a reserved word is being used as an identifier. An appropriate error -- message, pointing to the token, is also issued if either this is the -- first occurrence of misuse of this identifier, or if Force_Msg is True. ------------- -- Scanner -- ------------- -- The scanner used by the compiler is an instantiation of the -- generic package Scng with routines appropriate to the compiler package Scanner is new Scng (Post_Scan => Post_Scan, Error_Msg => Error_Msg, Error_Msg_S => Error_Msg_S, Error_Msg_SC => Error_Msg_SC, Error_Msg_SP => Error_Msg_SP, Obsolescent_Check => Obsolescent_Check, Style => Style.Style_Inst); procedure Scan renames Scanner.Scan; -- Scan scans out the next token, and advances the scan state accordingly -- (see package Scans 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. end Scn;