yyprint.c

早期freebsd实现

/*-
 * Copyright (c) 1980, 1993
 *	The Regents of the University of California.  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. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
 */

#ifndef lint
static char sccsid[] = "@(#)yyprint.c	8.1 (Berkeley) 6/6/93";
#endif /* not lint */

#include "whoami.h"
#include "0.h"
#include "tree_ty.h"	/* must be included for yy.h */
#include "yy.h"

char	*tokname();

STATIC	short bounce;

/*
 * Printing representation of a
 * "character" - a lexical token
 * not in a yytok structure.
 * 'which' indicates which char * you want
 * should always be called as "charname(...,0),charname(...,1)"
 */
char *
charname(ch , which )
	int ch;
	int which;
{
	struct yytok Ych;

	Ych.Yychar = ch;
	Ych.Yylval = nullsem(ch);
	return (tokname(&Ych , which ));
}

/*
 * Printing representation of a token
 * 'which' as above.
 */
char *
tokname(tp , which )
	register struct yytok *tp;
	int	 	      which;
{
	register char *cp;
	register struct kwtab *kp;
	char	*cp2;

	cp2 = "";
	switch (tp->Yychar) {
		case YCASELAB:
			cp = "case-label";
			break;
		case YEOF:
			cp = "end-of-file";
			break;
		case YILLCH:
			cp = "illegal character";
			break;
		case 256:
			/* error token */
			cp = "error";
			break;
		case YID:
			cp = "identifier";
			break;
		case YNUMB:
			cp = "real number";
			break;
		case YINT:
		case YBINT:
			cp = "number";
			break;
		case YSTRING:
			cp = (char *) tp->Yylval;
			cp = cp == NIL || cp[1] == 0 ? "character" : "string";
			break;
		case YDOTDOT:
			cp = "'..'";
			break;
		default:
			if (tp->Yychar < 256) {
				cp = "'x'\0'x'\0'x'\0'x'";
				/*
				 * for four times reentrant code!
				 * used to be:
				 * if (bounce = ((bounce + 1) & 1))
				 *	cp += 4;
				 */
				bounce = ( bounce + 1 ) % 4;
				cp += (4 * bounce);	/* 'x'\0 is 4 chars */
				cp[1] = tp->Yychar;
				break;
			}
			for (kp = yykey; kp->kw_str != NIL && kp->kw_val != tp->Yychar; kp++)
				continue;
			cp = "keyword ";
			cp2 = kp->kw_str;
	}
	return ( which ? cp2 : cp );
}