35 |
|
|
36 |
|
#define isdecimal(c) (isdigit(c) | ((c) == '.')) |
37 |
|
|
38 |
< |
static double euminus(EPNODE *), eargument(EPNODE *), enumber(EPNODE *); |
38 |
> |
#define envalue(ep) ((ep)->type==NUM ? (ep)->v.num : evalue(ep)) |
39 |
> |
|
40 |
> |
static double euminus(EPNODE *), enumber(EPNODE *); |
41 |
|
static double echannel(EPNODE *); |
42 |
|
static double eadd(EPNODE *), esubtr(EPNODE *), |
43 |
|
emult(EPNODE *), edivi(EPNODE *), |
208 |
|
} |
209 |
|
if (frep) |
210 |
|
efree(epar); |
211 |
+ |
else |
212 |
+ |
memset(epar, 0, sizeof(EPNODE)); |
213 |
|
} |
214 |
|
|
215 |
|
|
216 |
+ |
static void |
217 |
+ |
epflatten( /* flatten hierarchies for '+', '*' */ |
218 |
+ |
EPNODE *epar |
219 |
+ |
) |
220 |
+ |
{ |
221 |
+ |
EPNODE *ep; |
222 |
+ |
|
223 |
+ |
if (epar->nkids < 0) /* can't handle array allocations */ |
224 |
+ |
return; |
225 |
+ |
|
226 |
+ |
for (ep = epar->v.kid; ep != NULL; ep = ep->sibling) |
227 |
+ |
while (ep->type == epar->type && ep->nkids > 0) { |
228 |
+ |
EPNODE *ep1 = ep->v.kid; |
229 |
+ |
while (ep1->sibling != NULL) |
230 |
+ |
ep1 = ep1->sibling; |
231 |
+ |
ep1->sibling = ep->sibling; |
232 |
+ |
epar->nkids += ep->nkids - 1; |
233 |
+ |
ep1 = ep->v.kid; |
234 |
+ |
*ep = *ep1; |
235 |
+ |
efree(ep1); /* not epfree()! */ |
236 |
+ |
} |
237 |
+ |
} |
238 |
+ |
|
239 |
+ |
|
240 |
|
void |
241 |
< |
epoptimize( /* realloc lists as arrays if > length 3 */ |
241 |
> |
epoptimize( /* flatten operations, lists -> arrays */ |
242 |
|
EPNODE *epar |
243 |
|
) |
244 |
|
{ |
245 |
|
EPNODE *ep; |
246 |
|
|
247 |
< |
if (epar->nkids > 3) { /* do this node if > 3 kids */ |
247 |
> |
if ((epar->type == '+') | (epar->type == '*')) |
248 |
> |
epflatten(epar); /* flatten associative operations */ |
249 |
> |
|
250 |
> |
if (epar->nkids) /* do children if any */ |
251 |
> |
for (ep = epar->v.kid; ep != NULL; ep = ep->sibling) |
252 |
> |
epoptimize(ep); |
253 |
> |
|
254 |
> |
if (epar->nkids > 4) { /* make list into array if > 4 kids */ |
255 |
|
int n = 1; |
256 |
|
epar->v.kid = (EPNODE *)erealloc(epar->v.kid, |
257 |
|
sizeof(EPNODE)*epar->nkids); |
262 |
|
epar->v.kid[n-1].sibling = epar->v.kid + n; |
263 |
|
n++; |
264 |
|
} |
265 |
< |
epar->nkids = -epar->nkids; |
265 |
> |
epar->nkids = -n; |
266 |
|
} |
232 |
– |
if (epar->nkids) /* do children if any */ |
233 |
– |
for (ep = epar->v.kid; ep != NULL; ep = ep->sibling) |
234 |
– |
epoptimize(ep); |
267 |
|
} |
268 |
|
|
269 |
|
/* the following used to be a switch */ |
270 |
|
static double |
239 |
– |
eargument( |
240 |
– |
EPNODE *ep |
241 |
– |
) |
242 |
– |
{ |
243 |
– |
return(argument(ep->v.chan)); |
244 |
– |
} |
245 |
– |
|
246 |
– |
static double |
271 |
|
enumber( |
272 |
|
EPNODE *ep |
273 |
|
) |
298 |
|
EPNODE *ep |
299 |
|
) |
300 |
|
{ |
301 |
+ |
double sum = 0; |
302 |
|
EPNODE *ep1 = ep->v.kid; |
303 |
|
|
304 |
< |
return(evalue(ep1) + evalue(ep1->sibling)); |
304 |
> |
do |
305 |
> |
sum += envalue(ep1); |
306 |
> |
while ((ep1 = ep1->sibling) != NULL); |
307 |
> |
|
308 |
> |
return(sum); |
309 |
|
} |
310 |
|
|
311 |
|
static double |
314 |
|
) |
315 |
|
{ |
316 |
|
EPNODE *ep1 = ep->v.kid; |
317 |
+ |
EPNODE *ep2 = ep1->sibling; |
318 |
|
|
319 |
< |
return(evalue(ep1) - evalue(ep1->sibling)); |
319 |
> |
return(envalue(ep1) - envalue(ep2)); |
320 |
|
} |
321 |
|
|
322 |
|
static double |
324 |
|
EPNODE *ep |
325 |
|
) |
326 |
|
{ |
327 |
+ |
double prod = 1; |
328 |
|
EPNODE *ep1 = ep->v.kid; |
329 |
|
|
330 |
< |
return(evalue(ep1) * evalue(ep1->sibling)); |
330 |
> |
do |
331 |
> |
prod *= envalue(ep1); |
332 |
> |
while ((ep1 = ep1->sibling) != NULL); |
333 |
> |
|
334 |
> |
return(prod); |
335 |
|
} |
336 |
|
|
337 |
|
static double |
340 |
|
) |
341 |
|
{ |
342 |
|
EPNODE *ep1 = ep->v.kid; |
343 |
< |
double d; |
343 |
> |
double den = evalue(ep1->sibling); |
344 |
|
|
345 |
< |
d = evalue(ep1->sibling); |
311 |
< |
if (d == 0.0) { |
345 |
> |
if (den == 0.0) { |
346 |
|
wputs("Division by zero\n"); |
347 |
|
errno = ERANGE; |
348 |
|
return(0.0); |
349 |
|
} |
350 |
< |
return(evalue(ep1) / d); |
350 |
> |
return(envalue(ep1) / den); |
351 |
|
} |
352 |
|
|
353 |
|
static double |
555 |
|
) |
556 |
|
{ |
557 |
|
if (ep->nkids < 0) { |
558 |
< |
eputs("Cannot add child after optimization\n"); |
558 |
> |
eputs("Cannot add kid to EPNODE array\n"); |
559 |
|
quit(1); |
560 |
|
} |
561 |
|
ep->nkids++; |
566 |
|
; |
567 |
|
ep->sibling = ek; |
568 |
|
} |
569 |
< |
ek->sibling = NULL; |
569 |
> |
ek->sibling = NULL; /* shouldn't be necessary */ |
570 |
|
} |
571 |
|
|
572 |
|
|
732 |
|
ep2 = ep1; |
733 |
|
} else if ((ep3->type == NUM && ep3->v.num == 0) | |
734 |
|
(ep1->type == NUM && ep1->v.num == 1)) { |
735 |
< |
epfree(ep2,1); /* (E4 ^ 0) or (1 ^ E3) */ |
702 |
< |
ep2 = newnode(); |
735 |
> |
epfree(ep2,0); /* (E4 ^ 0) or (1 ^ E3) */ |
736 |
|
ep2->type = NUM; |
737 |
|
ep2->v.num = 1; |
738 |
|
} else if (ep3->type == NUM && ep3->v.num == 1) { |
795 |
|
scan(); |
796 |
|
return(ep1); |
797 |
|
} |
765 |
– |
|
798 |
|
if (esupport&E_INCHAN && nextc == '$') { |
799 |
|
scan(); |
800 |
|
ep1 = newnode(); |
802 |
|
ep1->v.chan = getinum(); |
803 |
|
return(ep1); |
804 |
|
} |
773 |
– |
|
805 |
|
if (esupport&(E_VARIABLE|E_FUNCTION) && |
806 |
|
(isalpha(nextc) | (nextc == CNTXMARK))) { |
807 |
|
nam = getname(); |
839 |
|
ep1 = rconst(ep1); |
840 |
|
return(ep1); |
841 |
|
} |
811 |
– |
|
842 |
|
if (isdecimal(nextc)) { |
843 |
|
ep1 = newnode(); |
844 |
|
ep1->type = NUM; |