[dragonfly.git] / usr.bin / window / parser5.c

/*	@(#)parser5.c	8.1 (Berkeley) 6/6/93	*/
/*	$NetBSD: parser5.c,v 1.7 2009/04/14 08:50:06 lukem 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"
#include "var.h"

/*
 * unary $ $? + - ! ~
 */
int
p_expr11(struct value *v, char flag)
{
	int op;
	const char *opname;

	switch (token) {
	case T_DOLLAR:
		opname = "$";
		break;
	case T_DQ:
		opname = "$?";
		break;
	case T_PLUS:
		opname = "unary +";
		break;
	case T_MINUS:
		opname = "unary -";
		break;
	case T_NOT:
		opname = "!";
		break;
	case T_COMP:
		opname = "~";
		break;
	default:
		return p_expr12(v, flag);
	}
	op = token;
	(void) s_gettok();
	if (p_expr11(v, flag) < 0)
		return -1;
	switch (v->v_type) {
	case V_NUM:
		break;
	case V_STR:
		switch (op) {
		case T_MINUS:
		case T_NOT:
		case T_COMP:
			p_error("%s: Numeric operand required.", opname);
			str_free(v->v_str);
			v->v_type = V_ERR;
			return 0;
		}
		break;
	case V_ERR:
		return 0;
	}
	switch (op) {
	case T_DOLLAR:
	case T_DQ:
		if (v->v_type == V_NUM) {
			int tmp = cx.x_type == X_BUF && cx.x_arg != 0 &&
				v->v_num > 0 && v->v_num <= cx.x_narg;
			if (op == T_DQ)
				v->v_num = tmp;
			else if (tmp)
				*v = cx.x_arg[v->v_num - 1];
			else {
				p_error("%d: No such argument.", v->v_num);
				v->v_type = V_ERR;
			}
		} else {
			char *name = v->v_str;
			struct var *r = var_lookup(name);
			if (op == T_DQ) {
				v->v_type = V_NUM;
				v->v_num = r != 0;
			} else if (r != 0)
				*v = r->r_val;
			else {
				p_error("%s: Undefined variable.", name);
				v->v_type = V_ERR;
			}
			str_free(name);
		}
		if (v->v_type == V_STR && (v->v_str = str_cpy(v->v_str)) == 0) {
			p_memerror();
			return -1;
		}
		break;
	case T_MINUS:
		v->v_num = - v->v_num;
		break;
	case T_NOT:
		v->v_num = ! v->v_num;
		break;
	case T_COMP:
		v->v_num = ~ v->v_num;
		break;
	}
	return 0;
}

/*
 * string, number, ( expr )
 * Plus function calls.
 *
 * Always return v_type == V_ERR when flag == 0.
 */
int
p_expr12(struct value *v, char flag)
{
	v->v_type = V_ERR;
	switch (token) {
	case T_NUM:
		if (flag) {
			v->v_type = V_NUM;
			v->v_num = token_num;
		}
		(void) s_gettok();
		break;
	case T_STR:
		if (flag) {
			v->v_type = V_STR;
			v->v_str = token_str;
		} else
			str_free(token_str);
		(void) s_gettok();
		break;
	case T_LP:
		(void) s_gettok();
		if (p_expr(v, flag) < 0) {
			p_synerror();
			return -1;
		}
		if (token != T_RP) {
			p_synerror();
			val_free(*v);
			return -1;
		}
		(void) s_gettok();
		break;
	default:
		return -1;
	}
	while (token == T_LP) {
		char *cmd;

		if (p_convstr(v) < 0)
			return -1;
		cmd = v->v_type == V_STR ? v->v_str : 0;
		if (p_function(cmd, v, flag) < 0) {
			if (cmd)
				str_free(cmd);
			return -1;
		}
		if (cmd)
			str_free(cmd);
	}
	return 0;
}
Commit	Line	Data
2c872e05	1	/* @(#)parser5.c 8.1 (Berkeley) 6/6/93 */
abecab39 SW	2	/* $NetBSD: parser5.c,v 1.7 2009/04/14 08:50:06 lukem 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	#include "var.h"
	39
	40	/*
	41	* unary $ $? + - ! ~
	42	*/
abecab39 SW	43	int
abecab39 SW	44	p_expr11(struct value *v, char flag)
984263bc MD	45	{
984263bc MD	46	int op;
abecab39	47	const char *opname;
984263bc MD	48
	49	switch (token) {
	50	case T_DOLLAR:
	51	opname = "$";
	52	break;
	53	case T_DQ:
	54	opname = "$?";
	55	break;
	56	case T_PLUS:
	57	opname = "unary +";
	58	break;
	59	case T_MINUS:
	60	opname = "unary -";
	61	break;
	62	case T_NOT:
	63	opname = "!";
	64	break;
	65	case T_COMP:
	66	opname = "~";
	67	break;
	68	default:
	69	return p_expr12(v, flag);
	70	}
	71	op = token;
	72	(void) s_gettok();
	73	if (p_expr11(v, flag) < 0)
	74	return -1;
	75	switch (v->v_type) {
	76	case V_NUM:
	77	break;
	78	case V_STR:
	79	switch (op) {
	80	case T_MINUS:
	81	case T_NOT:
	82	case T_COMP:
	83	p_error("%s: Numeric operand required.", opname);
	84	str_free(v->v_str);
	85	v->v_type = V_ERR;
	86	return 0;
	87	}
	88	break;
	89	case V_ERR:
	90	return 0;
	91	}
	92	switch (op) {
	93	case T_DOLLAR:
	94	case T_DQ:
	95	if (v->v_type == V_NUM) {
	96	int tmp = cx.x_type == X_BUF && cx.x_arg != 0 &&
	97	v->v_num > 0 && v->v_num <= cx.x_narg;
	98	if (op == T_DQ)
	99	v->v_num = tmp;
	100	else if (tmp)
	101	*v = cx.x_arg[v->v_num - 1];
	102	else {
	103	p_error("%d: No such argument.", v->v_num);
	104	v->v_type = V_ERR;
	105	}
	106	} else {
	107	char *name = v->v_str;
	108	struct var *r = var_lookup(name);
	109	if (op == T_DQ) {
	110	v->v_type = V_NUM;
	111	v->v_num = r != 0;
112	} else if (r != 0)
113	*v = r->r_val;
114	else {
115	p_error("%s: Undefined variable.", name);
116	v->v_type = V_ERR;
117	}
118	str_free(name);
119	}
120	if (v->v_type == V_STR && (v->v_str = str_cpy(v->v_str)) == 0) {
121	p_memerror();
122	return -1;
123	}
124	break;
125	case T_MINUS:
126	v->v_num = - v->v_num;
127	break;
128	case T_NOT:
129	v->v_num = ! v->v_num;
130	break;
131	case T_COMP:
132	v->v_num = ~ v->v_num;
133	break;
134	}
135	return 0;
136	}
137
138	/*
139	* string, number, ( expr )
140	* Plus function calls.
141	*
142	* Always return v_type == V_ERR when flag == 0.
143	*/
abecab39 SW	144	int
abecab39 SW	145	p_expr12(struct value *v, char flag)
984263bc MD	146	{
	147	v->v_type = V_ERR;
	148	switch (token) {
	149	case T_NUM:
	150	if (flag) {
	151	v->v_type = V_NUM;
	152	v->v_num = token_num;
	153	}
	154	(void) s_gettok();
	155	break;
	156	case T_STR:
	157	if (flag) {
	158	v->v_type = V_STR;
	159	v->v_str = token_str;
	160	} else
	161	str_free(token_str);
	162	(void) s_gettok();
	163	break;
	164	case T_LP:
	165	(void) s_gettok();
	166	if (p_expr(v, flag) < 0) {
	167	p_synerror();
	168	return -1;
	169	}
	170	if (token != T_RP) {
	171	p_synerror();
	172	val_free(*v);
	173	return -1;
	174	}
	175	(void) s_gettok();
	176	break;
	177	default:
	178	return -1;
	179	}
	180	while (token == T_LP) {
	181	char *cmd;
	182
	183	if (p_convstr(v) < 0)
	184	return -1;
	185	cmd = v->v_type == V_STR ? v->v_str : 0;
	186	if (p_function(cmd, v, flag) < 0) {
	187	if (cmd)
	188	str_free(cmd);
	189	return -1;
	190	}
	191	if (cmd)
	192	str_free(cmd);
	193	}
	194	return 0;
	195	}