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/*

 * Copyright (c) 2002-2005 The TenDRA Project <http://www.tendra.org/>.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 * 3. Neither the name of The TenDRA Project nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

 *    without specific, prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS

 * IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,

 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR

 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

 * EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;

 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,

 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF

 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 *

 * $Id$

 */

/*

    		 Crown Copyright (c) 1997

    This TenDRA(r) Computer Program is subject to Copyright

    owned by the United Kingdom Secretary of State for Defence

    acting through the Defence Evaluation and Research Agency

    (DERA).  It is made available to Recipients with a

    royalty-free licence for its use, reproduction, transfer

    to other parties and amendment for any purpose not excluding

    product development provided that any such use et cetera

    shall be deemed to be acceptance of the following conditions:-

        (1) Its Recipients shall ensure that this Notice is

        reproduced upon any copies or amended versions of it;

        (2) Any amended version of it shall be clearly marked to

        show both the nature of and the organisation responsible

        for the relevant amendment or amendments;

        (3) Its onward transfer from a recipient to another

        party shall be deemed to be that party's acceptance of

        these conditions;

        (4) DERA gives no warranty or assurance as to its

        quality or suitability for any purpose and DERA accepts

        no liability whatsoever in relation to any use to which

        it may be put.

*/

/*** lexer.h --- SID lexical analyser.

 *

 ** Author: Steve Folkes <smf@hermes.mod.uk>

 *

 *** Commentary:

 *

 * See the file "lexer.c" for more information.

 *

 *** Change Log:

 * $Log: lexer.h,v $

 * Revision 1.1.1.1  1998/01/17  15:57:42  release

 * First version to be checked into rolling release.

 *

 * Revision 1.2  1994/12/15  09:57:28  smf

 * Brought into line with OSSG C Coding Standards Document, as per

 * "CR94_178.sid+tld-update".

 *

 * Revision 1.1.1.1  1994/07/25  16:04:24  smf

 * Initial import of SID 1.8 non shared files.

 *

**/

/****************************************************************************/

#ifndef H_LEXER

#define H_LEXER

#include "os-interface.h"

#include "dstring.h"

#include "istream.h"

/**** Note:

 *

 * It is important that any changes to this enumerated type declaration are

 * reflected in the "parser.sid" file.

**/

#ifdef FS_NO_ENUM

typedef int LexerTokenT, *LexerTokenP;

#define LEXER_TOK_BLT_TYPES		(0)

#define LEXER_TOK_BLT_TERMINALS		(1)

#define LEXER_TOK_BLT_PRODUCTIONS	(2)

#define LEXER_TOK_BLT_ENTRY		(3)

#define LEXER_TOK_IDENTIFIER		(4)

#define LEXER_TOK_TYPEMARK		(5)

#define LEXER_TOK_OPEN_TUPLE		(6)

#define LEXER_TOK_CLOSE_TUPLE		(7)

#define LEXER_TOK_ARROW			(8)

#define LEXER_TOK_TERMINATOR		(9)

#define LEXER_TOK_BEGIN_ACTION		(10)

#define LEXER_TOK_END_ACTION		(11)

#define LEXER_TOK_DEFINE		(12)

#define LEXER_TOK_BEGIN_RULE		(13)

#define LEXER_TOK_END_RULE		(14)

#define LEXER_TOK_ALT_SEP		(15)

#define LEXER_TOK_HANDLER_SEP		(16)

#define LEXER_TOK_EMPTY			(17)

#define LEXER_TOK_PRED_RESULT		(18)

#define LEXER_TOK_IGNORE		(19)

#define LEXER_TOK_SCOPEMARK		(20)

#define LEXER_TOK_BEGIN_SCOPE		(21)

#define LEXER_TOK_END_SCOPE		(22)

#define LEXER_TOK_SEPARATOR		(23)

#define LEXER_TOK_REFERENCE		(24)

#define LEXER_TOK_EOF			(25)

#define LEXER_TOK_ERROR			(26)

#else

typedef enum {

    LEXER_TOK_BLT_TYPES,

    LEXER_TOK_BLT_TERMINALS,

    LEXER_TOK_BLT_PRODUCTIONS,

    LEXER_TOK_BLT_ENTRY,

    LEXER_TOK_IDENTIFIER,

    LEXER_TOK_TYPEMARK,

    LEXER_TOK_OPEN_TUPLE,

    LEXER_TOK_CLOSE_TUPLE,

    LEXER_TOK_ARROW,

    LEXER_TOK_TERMINATOR,

    LEXER_TOK_BEGIN_ACTION,

    LEXER_TOK_END_ACTION,

    LEXER_TOK_DEFINE,

    LEXER_TOK_BEGIN_RULE,

    LEXER_TOK_END_RULE,

    LEXER_TOK_ALT_SEP,

    LEXER_TOK_HANDLER_SEP,

    LEXER_TOK_EMPTY,

    LEXER_TOK_PRED_RESULT,

    LEXER_TOK_IGNORE,

    LEXER_TOK_SCOPEMARK,

    LEXER_TOK_BEGIN_SCOPE,

    LEXER_TOK_END_SCOPE,

    LEXER_TOK_SEPARATOR,

    LEXER_TOK_REFERENCE,

    LEXER_TOK_EOF,

    LEXER_TOK_ERROR

} LexerTokenT, *LexerTokenP;

#endif /* defined (FS_NO_ENUM) */

typedef struct LexT {

    LexerTokenT			t;

    union {

	NStringT		string;

    } u;

} LexT, *LexP;

typedef struct LexerStreamT {

    IStreamT			istream;

    LexT			token;

    LexerTokenT			saved_terminal;

} LexerStreamT, *LexerStreamP;

/*--------------------------------------------------------------------------*/

extern void		lexer_init(LexerStreamP, IStreamP);

extern void		lexer_close(LexerStreamP);

extern CStringP		lexer_stream_name(LexerStreamP);

extern unsigned		lexer_stream_line(LexerStreamP);

extern LexerTokenT	lexer_get_terminal(LexerStreamP);

extern void		lexer_next_token(LexerStreamP);

extern NStringP		lexer_string_value(LexerStreamP);

extern void		lexer_save_terminal(LexerStreamP, LexerTokenT);

extern void		lexer_restore_terminal(LexerStreamP);

/*--------------------------------------------------------------------------*/

#ifdef FS_FAST

#define lexer_close(s)		(istream_close(&((s)->istream)))

#define lexer_stream_name(s)	(istream_name(&((s)->istream)))

#define lexer_stream_line(s)	(istream_line(&((s)->istream)))

#define lexer_get_terminal(s)	((s)->token.t)

#define lexer_string_value(s)	(&((s)->token.u.string))

#endif /* defined (FS_FAST) */

#endif /* !defined (H_LEXER) */

/*

 * Local variables(smf):

 * eval: (include::add-path-entry "../os-interface" "../library")

 * eval: (include::add-path-entry "../transforms" "../generated")

 * end:

**/