michael@0: /*
michael@0:  * $Xorg: ifparser.h,v 1.3 2000/08/17 19:41:51 cpqbld Exp $
michael@0:  *
michael@0:  * Copyright 1992 Network Computing Devices, Inc.
michael@0:  * 
michael@0:  * Permission to use, copy, modify, and distribute this software and its
michael@0:  * documentation for any purpose and without fee is hereby granted, provided
michael@0:  * that the above copyright notice appear in all copies and that both that
michael@0:  * copyright notice and this permission notice appear in supporting
michael@0:  * documentation, and that the name of Network Computing Devices may not be
michael@0:  * used in advertising or publicity pertaining to distribution of the software
michael@0:  * without specific, written prior permission.  Network Computing Devices makes
michael@0:  * no representations about the suitability of this software for any purpose.
michael@0:  * It is provided ``as is'' without express or implied warranty.
michael@0:  * 
michael@0:  * NETWORK COMPUTING DEVICES DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
michael@0:  * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS,
michael@0:  * IN NO EVENT SHALL NETWORK COMPUTING DEVICES BE LIABLE FOR ANY SPECIAL,
michael@0:  * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
michael@0:  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
michael@0:  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
michael@0:  * PERFORMANCE OF THIS SOFTWARE.
michael@0:  * 
michael@0:  * Author:  Jim Fulton
michael@0:  *          Network Computing Devices, Inc.
michael@0:  * 
michael@0:  * Simple if statement processor
michael@0:  *
michael@0:  * This module can be used to evaluate string representations of C language
michael@0:  * if constructs.  It accepts the following grammar:
michael@0:  * 
michael@0:  *     EXPRESSION	:=	VALUE
michael@0:  * 			 |	VALUE  BINOP	EXPRESSION
michael@0:  *			 |	VALUE	'?'	EXPRESSION ':'	EXPRESSION
michael@0:  * 
michael@0:  *     VALUE		:=	'('  EXPRESSION  ')'
michael@0:  * 			 |	'!'  VALUE
michael@0:  * 			 |	'-'  VALUE
michael@0:  *			 |	'~'  VALUE
michael@0:  * 			 |	'defined'  '('  variable  ')'
michael@0:  * 			 |	variable
michael@0:  * 			 |	number
michael@0:  * 
michael@0:  *     BINOP		:=	'*'	|  '/'	|  '%'
michael@0:  * 			 |	'+'	|  '-'
michael@0:  * 			 |	'<<'	|  '>>'
michael@0:  * 			 |	'<'	|  '>'	|  '<='  |  '>='
michael@0:  * 			 |	'=='	|  '!='
michael@0:  * 			 |	'&'	|  '^'  |  '|'
michael@0:  * 			 |	'&&'	|  '||'
michael@0:  * 
michael@0:  * The normal C order of precedence is supported.
michael@0:  * 
michael@0:  * 
michael@0:  * External Entry Points:
michael@0:  * 
michael@0:  *     ParseIfExpression		parse a string for #if
michael@0:  */
michael@0: 
michael@0: /* $XFree86: xc/config/makedepend/ifparser.h,v 3.5 2001/07/25 15:04:40 dawes Exp $ */
michael@0: 
michael@0: #include <stdio.h>
michael@0: 
michael@0: typedef int Bool;
michael@0: #define False 0
michael@0: #define True 1
michael@0: 
michael@0: typedef struct _if_parser {
michael@0:     struct {				/* functions */
michael@0: 	const char *(*handle_error) (struct _if_parser *, const char *,
michael@0: 				     const char *);
michael@0: 	long (*eval_variable) (struct _if_parser *, const char *, int);
michael@0: 	int (*eval_defined) (struct _if_parser *, const char *, int);
michael@0:     } funcs;
michael@0:     char *data;
michael@0: } IfParser;
michael@0: 
michael@0: const char *ParseIfExpression (
michael@0:     IfParser *, 
michael@0:     const char *, 
michael@0:     long *
michael@0: );
michael@0: