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ifparser.h

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

/* $XFree86: xc/config/makedepend/ifparser.h,v 3.5 2001/07/25 15:04:40 dawes Exp $ */

#include <stdio.h>

typedef int Bool;
#define False 0
#define True 1

typedef struct _if_parser {
    struct {                        /* functions */
      const char *(*handle_error) (struct _if_parser *, const char *,
                             const char *);
      long (*eval_variable) (struct _if_parser *, const char *, int);
      int (*eval_defined) (struct _if_parser *, const char *, int);
    } funcs;
    char *data;
} IfParser;

const char *ParseIfExpression (
    IfParser *, 
    const char *, 
    long *
);


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