2 * Empire - A multi-player, client/server Internet based war game.
3 * Copyright (C) 1986-2008, Dave Pare, Jeff Bailey, Thomas Ruschak,
4 * Ken Stevens, Steve McClure
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 * See files README, COPYING and CREDITS in the root of the source
23 * tree for related information and legal notices. It is expected
24 * that future projects/authors will amend these files as needed.
28 * nstreval.c: evaluate compiled values
30 * Known contributors to this file:
33 * Markus Armbruster, 2004-2008
46 * Initialize VAL to symbolic value for selector CA with index IDX.
50 nstr_mksymval(struct valstr *val, struct castr *ca, int idx)
52 val->val_type = ca->ca_type;
53 val->val_cat = NSC_OFF;
54 val->val_as.sym.off = ca->ca_off;
55 val->val_as.sym.len = ca->ca_len;
56 val->val_as.sym.idx = idx;
57 val->val_as.sym.get = ca->ca_get;
63 * If VAL is symbolic, evaluate it into a promoted value type.
64 * Translate it for country CNUM (coordinate system and contact
65 * status), except when CNUM is NATID_BAD.
66 * PTR points to a context object of the type that was used to compile
68 * Unless WANT is NSC_NOTYPE, coerce the value to promoted value type
69 * WANT. VAL must be coercible. That's the case if a previous
70 * nstr_coerce_val(VAL, WANT, STR) succeeded.
73 nstr_exec_val(struct valstr *val, natid cnum, void *ptr, enum nsc_type want)
76 enum nsc_type valtype;
81 if (CANT_HAPPEN(want != NSC_NOTYPE && !NSC_IS_PROMOTED(want)))
82 want = nstr_promote(want);
84 switch (val->val_cat) {
86 valtype = val->val_type;
89 if (val->val_as.sym.get) {
92 ptr = val->val_as.sym.get(val, natp, ptr);
93 } while (ptr && val->val_as.sym.get);
95 valtype = val->val_type;
96 val->val_cat = NSC_VAL;
103 memb_ptr += val->val_as.sym.off;
104 idx = val->val_as.sym.idx;
105 switch (val->val_type) {
107 val->val_as.lng = ((signed char *)memb_ptr)[idx];
110 val->val_as.lng = ((unsigned char *)memb_ptr)[idx];
113 val->val_as.lng = ((short *)memb_ptr)[idx];
116 val->val_as.lng = ((unsigned short *)memb_ptr)[idx];
119 val->val_as.lng = ((int *)memb_ptr)[idx];
122 val->val_as.lng = ((long *)memb_ptr)[idx];
125 c = ((short *)memb_ptr)[idx];
126 if (cnum == NATID_BAD) {
127 /* FIXME use variant of xrel() that takes orig instead of nation */
128 if (c >= WORLD_X / 2)
131 c = xrel(getnatp(cnum), c);
135 c = ((short *)memb_ptr)[idx];
136 if (cnum == NATID_BAD) {
137 /* FIXME use variant of yrel() that takes orig instead of nation */
138 if (c >= WORLD_Y / 2)
141 c = yrel(getnatp(cnum), c);
145 val->val_as.lng = -1;
146 if (CANT_HAPPEN(((struct natstr *)ptr)->ef_type != EF_NATION))
148 if (opt_HIDDEN && cnum != NATID_BAD) {
149 natp = getnatp(cnum);
150 if (natp->nat_stat != STAT_GOD
151 && !(getcontact(natp, idx) && getcontact(ptr, idx)))
154 val->val_as.lng = ((unsigned char *)memb_ptr)[idx];
157 val->val_as.dbl = ((float *)memb_ptr)[idx];
158 valtype = NSC_DOUBLE;
161 val->val_as.dbl = ((double *)memb_ptr)[idx];
162 valtype = NSC_DOUBLE;
166 val->val_as.str.maxsz = val->val_as.sym.len;
167 val->val_as.str.base = (char *)memb_ptr;
168 valtype = NSC_STRING;
171 val->val_as.str.base = ((char **)memb_ptr)[idx];
172 val->val_as.str.maxsz = INT_MAX;
173 valtype = NSC_STRING;
176 val->val_as.lng = ((time_t *)memb_ptr)[idx];
182 val->val_cat = NSC_VAL;
186 valtype = NSC_NOTYPE;
191 else if (want == NSC_DOUBLE) {
192 if (valtype == NSC_LONG) {
194 val->val_as.dbl = val->val_as.lng;
196 } else if (want == NSC_STRING)
197 CANT_REACH(); /* FIXME implement */
199 if (CANT_HAPPEN(valtype != want && want != NSC_NOTYPE)) {
200 /* make up an error value */
202 memset(&val->val_as, 0, sizeof(val->val_as));
205 val->val_type = valtype;
211 * If VALTYPE is an integer type, return NSC_LONG.
212 * If VALTYPE is a floating-point type, return NSC_DOUBLE.
213 * If VALTYPE is a string type, return NSC_STRING.
216 nstr_promote(int valtype)
235 valtype = NSC_DOUBLE;
238 valtype = NSC_STRING;
242 valtype = NSC_NOTYPE;
248 symbol_by_value(int key, struct symbol *table)
252 for (i = 0; table[i].name; i++)
253 if (key == table[i].value)
254 return table[i].name;