[unix-history] / usr.bin / ctags / yacc.c

/*
 * Copyright (c) 1987 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[] = "@(#)yacc.c	5.6 (Berkeley) 2/26/91";
#endif /* not lint */

#include <stdio.h>
#include <string.h>
#include "ctags.h"

/*
 * y_entries:
 *	find the yacc tags and put them in.
 */
y_entries()
{
	register int	c;
	register char	*sp;
	register bool	in_rule;
	char	tok[MAXTOKEN];

	while (GETC(!=,EOF))
		switch ((char)c) {
		case '\n':
			SETLINE;
			/* FALLTHROUGH */
		case ' ':
		case '\f':
		case '\r':
		case '\t':
			break;
		case '{':
			if (skip_key((int)'}'))
				in_rule = NO;
			break;
		case '\'':
		case '"':
			if (skip_key(c))
				in_rule = NO;
			break;
		case '%':
			if (GETC(==,'%'))
				return;
			(void)ungetc(c,inf);
			break;
		case '/':
			if (GETC(==,'*'))
				skip_comment();
			else
				(void)ungetc(c,inf);
			break;
		case '|':
		case ';':
			in_rule = NO;
			break;
		default:
			if (in_rule || !isalpha(c) && c != (int)'.'
			    && c != (int)'_')
				break;
			sp = tok;
			*sp++ = c;
			while (GETC(!=,EOF) && (intoken(c) || c == (int)'.'))
				*sp++ = c;
			*sp = EOS;
			getline();		/* may change before ':' */
			while (iswhite(c)) {
				if (c == (int)'\n')
					SETLINE;
				if (GETC(==,EOF))
					return;
			}
			if (c == (int)':') {
				pfnote(tok,lineno);
				in_rule = YES;
			}
			else
				(void)ungetc(c,inf);
		}
}

/*
 * toss_yysec --
 *	throw away lines up to the next "\n%%\n"
 */
toss_yysec()
{
	register int	c,			/* read character */
			state;

	/*
	 * state == 0 : waiting
	 * state == 1 : received a newline
	 * state == 2 : received first %
	 * state == 3 : recieved second %
	 */
	lineftell = ftell(inf);
	for (state = 0;GETC(!=,EOF);)
		switch ((char)c) {
			case '\n':
				++lineno;
				lineftell = ftell(inf);
				if (state == 3)		/* done! */
					return;
				state = 1;		/* start over */
				break;
			case '%':
				if (state)		/* if 1 or 2 */
					++state;	/* goto 3 */
				break;
			default:
				state = 0;		/* reset */
		}
}
Commit	Line	Data
15637ed4 RG	1	/*
	2	* Copyright (c) 1987 The Regents of the University of California.
	3	* All rights reserved.
	4	*
	5	* Redistribution and use in source and binary forms, with or without
	6	* modification, are permitted provided that the following conditions
	7	* are met:
	8	* 1. Redistributions of source code must retain the above copyright
	9	* notice, this list of conditions and the following disclaimer.
	10	* 2. Redistributions in binary form must reproduce the above copyright
	11	* notice, this list of conditions and the following disclaimer in the
	12	* documentation and/or other materials provided with the distribution.
	13	* 3. All advertising materials mentioning features or use of this software
	14	* must display the following acknowledgement:
	15	* This product includes software developed by the University of
	16	* California, Berkeley and its contributors.
	17	* 4. Neither the name of the University nor the names of its contributors
	18	* may be used to endorse or promote products derived from this software
	19	* without specific prior written permission.
	20	*
	21	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	22	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	23	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	24	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	25	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	26	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	27	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	28	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	29	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	30	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	31	* SUCH DAMAGE.
	32	*/
	33
	34	#ifndef lint
	35	static char sccsid[] = "@(#)yacc.c 5.6 (Berkeley) 2/26/91";
	36	#endif /* not lint */
	37
	38	#include <stdio.h>
	39	#include <string.h>
	40	#include "ctags.h"
	41
	42	/*
	43	* y_entries:
	44	* find the yacc tags and put them in.
	45	*/
	46	y_entries()
	47	{
	48	register int c;
	49	register char *sp;
	50	register bool in_rule;
	51	char tok[MAXTOKEN];
	52
	53	while (GETC(!=,EOF))
	54	switch ((char)c) {
	55	case '\n':
	56	SETLINE;
	57	/* FALLTHROUGH */
	58	case ' ':
	59	case '\f':
	60	case '\r':
	61	case '\t':
	62	break;
	63	case '{':
	64	if (skip_key((int)'}'))
65	in_rule = NO;
66	break;
67	case '\'':
68	case '"':
69	if (skip_key(c))
70	in_rule = NO;
71	break;
72	case '%':
73	if (GETC(==,'%'))
74	return;
75	(void)ungetc(c,inf);
76	break;
77	case '/':
78	if (GETC(==,'*'))
79	skip_comment();
80	else
81	(void)ungetc(c,inf);
82	break;
83	case '\|':
84	case ';':
85	in_rule = NO;
86	break;
87	default:
88	if (in_rule \|\| !isalpha(c) && c != (int)'.'
89	&& c != (int)'_')
90	break;
91	sp = tok;
92	*sp++ = c;
93	while (GETC(!=,EOF) && (intoken(c) \|\| c == (int)'.'))
94	*sp++ = c;
95	*sp = EOS;
96	getline(); /* may change before ':' */
97	while (iswhite(c)) {
98	if (c == (int)'\n')
99	SETLINE;
100	if (GETC(==,EOF))
101	return;
102	}
103	if (c == (int)':') {
104	pfnote(tok,lineno);
105	in_rule = YES;
106	}
107	else
108	(void)ungetc(c,inf);
109	}
110	}
111
112	/*
113	* toss_yysec --
114	* throw away lines up to the next "\n%%\n"
115	*/
116	toss_yysec()
117	{
118	register int c, /* read character */
119	state;
120
121	/*
122	* state == 0 : waiting
123	* state == 1 : received a newline
124	* state == 2 : received first %
125	* state == 3 : recieved second %
126	*/
127	lineftell = ftell(inf);
128	for (state = 0;GETC(!=,EOF);)
129	switch ((char)c) {
130	case '\n':
131	++lineno;
132	lineftell = ftell(inf);
133	if (state == 3) /* done! */
134	return;
135	state = 1; /* start over */
136	break;
137	case '%':
138	if (state) /* if 1 or 2 */
139	++state; /* goto 3 */
140	break;
141	default:
142	state = 0; /* reset */
143	}
144	}