[unix-history] / usr / src / usr.bin / window / parser3.c

/*
 * Copyright (c) 1983 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.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char sccsid[] = "@(#)parser3.c	3.9 (Berkeley) %G%";
#endif /* not lint */

#include "parser.h"

/*
 * =
 * ? :
 * ||
 * &&
 * |
 * ^
 * &
 * == !=
 * <= >=
 * << >>
 * + -
 * * / %
 * unary - + ~ !
 */
p_expr(v, flag)
register 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;
}

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

	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);
}

/*
 * ||
 */
p_expr1(v, flag)
register 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;
	}
}

/*
 * &&
 */
p_expr2(v, flag)
register 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
60de5df9	1	/*
46e9ea25 KB	2	* Copyright (c) 1983 Regents of the University of California.
	3	* All rights reserved.
	4	*
3dd3a9e5 KB	5	* This code is derived from software contributed to Berkeley by
	6	* Edward Wang at The University of California, Berkeley.
	7	*
87f529ec	8	* %sccs.include.redist.c%
60de5df9 EW	9	*/
60de5df9 EW	10
46e9ea25	11	#ifndef lint
3dd3a9e5	12	static char sccsid[] = "@(#)parser3.c 3.9 (Berkeley) %G%";
46e9ea25 KB	13	#endif /* not lint */
46e9ea25 KB	14
6c6eaf9a EW	15	#include "parser.h"
	16
	17	/*
	18	* =
	19	* ? :
	20	* \|\|
	21	* &&
	22	* \|
	23	* ^
	24	* &
	25	* == !=
	26	* <= >=
	27	* << >>
	28	* + -
	29	* * / %
	30	* unary - + ~ !
	31	*/
	32	p_expr(v, flag)
	33	register struct value *v;
	34	char flag;
	35	{
	36	struct value t;
	37	int ret;
	38
6c6eaf9a EW	39	if (p_expr0(&t, flag) < 0)
	40	return -1;
	41
	42	if (token != T_ASSIGN) {
	43	*v = t;
	44	return 0;
	45	}
	46	switch (t.v_type) {
bb4a0c0b EW	47	case V_NUM:
bb4a0c0b EW	48	p_error("%d: Not a variable.", t.v_num);
6c6eaf9a EW	49	case V_ERR:
	50	t.v_str = 0;
	51	break;
6c6eaf9a EW	52	}
	53	ret = p_assign(t.v_str, v, flag);
	54	if (t.v_str != 0)
	55	str_free(t.v_str);
	56	return ret;
	57	}
	58
	59	/*
	60	* ? :
	61	*/
	62	p_expr0(v, flag)
	63	register struct value *v;
	64	char flag;
	65	{
	66	struct value t;
	67	char true;
	68
	69	if (p_expr1(v, flag) < 0)
	70	return -1;
	71	if (token != T_QUEST)
	72	return 0;
	73	switch (v->v_type) {
	74	case V_NUM:
	75	true = v->v_num != 0;
	76	break;
	77	case V_STR:
fbbe9777	78	p_error("?: Numeric left operand required.");
6c6eaf9a EW	79	str_free(v->v_str);
	80	v->v_type = V_ERR;
	81	case V_ERR:
	82	flag = 0;
	83	break;
	84	}
	85	(void) s_gettok();
	86	v->v_type = V_ERR;
	87	if ((flag && true ? p_expr1(v, 1) : p_expr1(&t, 0)) < 0)
	88	return -1;
	89	if (token != T_COLON) {
	90	val_free(*v);
	91	p_synerror();
	92	return -1;
	93	}
	94	(void) s_gettok();
	95	return flag && !true ? p_expr1(v, 1) : p_expr1(&t, 0);
	96	}
	97
	98	/*
	99	* \|\|
	100	*/
	101	p_expr1(v, flag)
	102	register struct value *v;
	103	char flag;
	104	{
	105	char true = 0;
	106
	107	if (p_expr2(v, flag) < 0)
	108	return -1;
	109	if (token != T_OROR)
	110	return 0;
	111	for (;;) {
	112	switch (v->v_type) {
	113	case V_NUM:
	114	v->v_num = true = true \|\| v->v_num != 0;
	115	break;
	116	case V_STR:
fbbe9777	117	p_error("\|\|: Numeric operands required.");
6c6eaf9a EW	118	str_free(v->v_str);
	119	v->v_type = V_ERR;
	120	case V_ERR:
	121	flag = 0;
	122	break;
	123	}
	124	if (token != T_OROR)
	125	return 0;
	126	(void) s_gettok();
	127	if (p_expr2(v, flag && !true) < 0)
	128	return -1;
	129	}
	130	}
	131
	132	/*
	133	* &&
	134	*/
	135	p_expr2(v, flag)
	136	register struct value *v;
	137	char flag;
	138	{
	139	char true = 1;
	140
	141	if (p_expr3_10(3, v, flag) < 0)
	142	return -1;
	143	if (token != T_ANDAND)
	144	return 0;
	145	for (;;) {
	146	switch (v->v_type) {
	147	case V_NUM:
	148	v->v_num = true = true && v->v_num != 0;
	149	break;
	150	case V_STR:
fbbe9777	151	p_error("&&: Numeric operands required.");
6c6eaf9a EW	152	str_free(v->v_str);
	153	v->v_type = V_ERR;
	154	case V_ERR:
	155	flag = 0;
	156	break;
	157	}
	158	if (token != T_ANDAND)
	159	return 0;
	160	(void) s_gettok();
	161	if (p_expr3_10(3, v, flag && true) < 0)
	162	return -1;
	163	}
	164	/NOTREACHED/
	165	}