[dragonfly.git] / usr.bin / window / parser3.c

/*	@(#)parser3.c	8.1 (Berkeley) 6/6/93	*/
/*	$NetBSD: parser3.c,v 1.6 2003/08/07 11:17:28 agc Exp $	*/

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Edward Wang at The University of California, Berkeley.
 *
 * 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 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.
 */

#include "defs.h"
#include "parser.h"

/*
 * =
 * ? :
 * ||
 * &&
 * |
 * ^
 * &
 * == !=
 * <= >=
 * << >>
 * + -
 * * / %
 * unary - + ~ !
 */
int
p_expr(struct value *v, char flag)
{
	struct value t;
	int ret;

	if (p_expr0(&t, flag) < 0)
		return -1;

	if (token != T_ASSIGN) {
		*v = t;
		return 0;
	}
	switch (t.v_type) {
	case V_NUM:
		p_error("%d: Not a variable.", t.v_num);
	case V_ERR:
		t.v_str = 0;
		break;
	}
	ret = p_assign(t.v_str, v, flag);
	if (t.v_str != 0)
		str_free(t.v_str);
	return ret;
}

/*
 * ? :
 */
int
p_expr0(struct value *v, char flag)
{
	struct value t;
	char true = 0;

	if (p_expr1(v, flag) < 0)
		return -1;
	if (token != T_QUEST)
		return 0;
	switch (v->v_type) {
	case V_NUM:
		true = v->v_num != 0;
		break;
	case V_STR:
		p_error("?: Numeric left operand required.");
		str_free(v->v_str);
		v->v_type = V_ERR;
	case V_ERR:
		flag = 0;
		break;
	}
	(void) s_gettok();
	v->v_type = V_ERR;
	if ((flag && true ? p_expr1(v, 1) : p_expr1(&t, 0)) < 0)
		return -1;
	if (token != T_COLON) {
		val_free(*v);
		p_synerror();
		return -1;
	}
	(void) s_gettok();
	return flag && !true ? p_expr1(v, 1) : p_expr1(&t, 0);
}

/*
 * ||
 */
int
p_expr1(struct value *v, char flag)
{
	char true = 0;

	if (p_expr2(v, flag) < 0)
		return -1;
	if (token != T_OROR)
		return 0;
	for (;;) {
		switch (v->v_type) {
		case V_NUM:
			v->v_num = true = true || v->v_num != 0;
			break;
		case V_STR:
			p_error("||: Numeric operands required.");
			str_free(v->v_str);
			v->v_type = V_ERR;
		case V_ERR:
			flag = 0;
			break;
		}
		if (token != T_OROR)
			return 0;
		(void) s_gettok();
		if (p_expr2(v, flag && !true) < 0)
			return -1;
	}
}

/*
 * &&
 */
int
p_expr2(struct value *v, char flag)
{
	char true = 1;

	if (p_expr3_10(3, v, flag) < 0)
		return -1;
	if (token != T_ANDAND)
		return 0;
	for (;;) {
		switch (v->v_type) {
		case V_NUM:
			v->v_num = true = true && v->v_num != 0;
			break;
		case V_STR:
			p_error("&&: Numeric operands required.");
			str_free(v->v_str);
			v->v_type = V_ERR;
		case V_ERR:
			flag = 0;
			break;
		}
		if (token != T_ANDAND)
			return 0;
		(void) s_gettok();
		if (p_expr3_10(3, v, flag && true) < 0)
			return -1;
	}
	/*NOTREACHED*/
}
Commit	Line	Data
2c872e05	1	/* @(#)parser3.c 8.1 (Berkeley) 6/6/93 */
abecab39 SW	2	/* $NetBSD: parser3.c,v 1.6 2003/08/07 11:17:28 agc Exp $ */
abecab39 SW	3
984263bc MD	4	/*
	5	* Copyright (c) 1983, 1993
	6	* The Regents of the University of California. All rights reserved.
	7	*
	8	* This code is derived from software contributed to Berkeley by
	9	* Edward Wang at The University of California, Berkeley.
	10	*
	11	* Redistribution and use in source and binary forms, with or without
	12	* modification, are permitted provided that the following conditions
	13	* are met:
	14	* 1. Redistributions of source code must retain the above copyright
	15	* notice, this list of conditions and the following disclaimer.
	16	* 2. Redistributions in binary form must reproduce the above copyright
	17	* notice, this list of conditions and the following disclaimer in the
	18	* documentation and/or other materials provided with the distribution.
abecab39	19	* 3. Neither the name of the University nor the names of its contributors
984263bc MD	20	* may be used to endorse or promote products derived from this software
	21	* without specific prior written permission.
	22	*
	23	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	24	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	25	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	26	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	27	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	28	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	29	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	30	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	31	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	32	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	33	* SUCH DAMAGE.
	34	*/
	35
abecab39	36	#include "defs.h"
984263bc MD	37	#include "parser.h"
	38
	39	/*
	40	* =
	41	* ? :
	42	* \|\|
	43	* &&
	44	* \|
	45	* ^
	46	* &
	47	* == !=
	48	* <= >=
	49	* << >>
	50	* + -
	51	* * / %
	52	* unary - + ~ !
	53	*/
abecab39 SW	54	int
abecab39 SW	55	p_expr(struct value *v, char flag)
984263bc MD	56	{
	57	struct value t;
	58	int ret;
	59
	60	if (p_expr0(&t, flag) < 0)
	61	return -1;
	62
	63	if (token != T_ASSIGN) {
	64	*v = t;
	65	return 0;
	66	}
	67	switch (t.v_type) {
	68	case V_NUM:
	69	p_error("%d: Not a variable.", t.v_num);
	70	case V_ERR:
	71	t.v_str = 0;
	72	break;
	73	}
	74	ret = p_assign(t.v_str, v, flag);
	75	if (t.v_str != 0)
	76	str_free(t.v_str);
	77	return ret;
	78	}
	79
	80	/*
	81	* ? :
	82	*/
abecab39 SW	83	int
abecab39 SW	84	p_expr0(struct value *v, char flag)
984263bc MD	85	{
984263bc MD	86	struct value t;
abecab39	87	char true = 0;
984263bc MD	88
	89	if (p_expr1(v, flag) < 0)
	90	return -1;
	91	if (token != T_QUEST)
	92	return 0;
	93	switch (v->v_type) {
	94	case V_NUM:
	95	true = v->v_num != 0;
	96	break;
	97	case V_STR:
	98	p_error("?: Numeric left operand required.");
	99	str_free(v->v_str);
	100	v->v_type = V_ERR;
	101	case V_ERR:
	102	flag = 0;
	103	break;
	104	}
	105	(void) s_gettok();
	106	v->v_type = V_ERR;
	107	if ((flag && true ? p_expr1(v, 1) : p_expr1(&t, 0)) < 0)
	108	return -1;
	109	if (token != T_COLON) {
	110	val_free(*v);
	111	p_synerror();
	112	return -1;
	113	}
	114	(void) s_gettok();
	115	return flag && !true ? p_expr1(v, 1) : p_expr1(&t, 0);
	116	}
	117
	118	/*
	119	* \|\|
	120	*/
abecab39 SW	121	int
abecab39 SW	122	p_expr1(struct value *v, char flag)
984263bc MD	123	{
	124	char true = 0;
	125
	126	if (p_expr2(v, flag) < 0)
	127	return -1;
	128	if (token != T_OROR)
	129	return 0;
	130	for (;;) {
	131	switch (v->v_type) {
	132	case V_NUM:
	133	v->v_num = true = true \|\| v->v_num != 0;
	134	break;
	135	case V_STR:
	136	p_error("\|\|: Numeric operands required.");
	137	str_free(v->v_str);
	138	v->v_type = V_ERR;
	139	case V_ERR:
	140	flag = 0;
	141	break;
	142	}
	143	if (token != T_OROR)
	144	return 0;
	145	(void) s_gettok();
	146	if (p_expr2(v, flag && !true) < 0)
	147	return -1;
	148	}
	149	}
	150
	151	/*
	152	* &&
	153	*/
abecab39 SW	154	int
abecab39 SW	155	p_expr2(struct value *v, char flag)
984263bc MD	156	{
	157	char true = 1;
	158
	159	if (p_expr3_10(3, v, flag) < 0)
	160	return -1;
	161	if (token != T_ANDAND)
	162	return 0;
	163	for (;;) {
	164	switch (v->v_type) {
	165	case V_NUM:
	166	v->v_num = true = true && v->v_num != 0;
	167	break;
	168	case V_STR:
	169	p_error("&&: Numeric operands required.");
	170	str_free(v->v_str);
	171	v->v_type = V_ERR;
	172	case V_ERR:
	173	flag = 0;
	174	break;
	175	}
	176	if (token != T_ANDAND)
	177	return 0;
	178	(void) s_gettok();
	179	if (p_expr3_10(3, v, flag && true) < 0)
	180	return -1;
	181	}
	182	/NOTREACHED/
	183	}