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/* Copyright (c) 1992 Regents of the University of California */ |
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|
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#ifndef lint |
2 |
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static char SCCSid[] = "$SunId$ LBL"; |
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static const char RCSid[] = "$Id$"; |
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#endif |
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|
4 |
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/* |
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* Compute data values using expression parser |
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* |
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* 1/29/87 Made variables conditional (VARIABLE) |
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* |
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* 5/19/88 Added constant subexpression elimination (RCONST) |
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* |
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* 2/19/03 Eliminated conditional compiles in favor of esupport extern. |
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*/ |
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|
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#include <stdio.h> |
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#include "copyright.h" |
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#include <stdio.h> |
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#include <string.h> |
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#include <ctype.h> |
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|
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#include <errno.h> |
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|
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#include <math.h> |
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#include <stdlib.h> |
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|
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#include "rterror.h" |
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#include "calcomp.h" |
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|
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#define MAXLINE 256 /* maximum line length */ |
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|
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#define isdecimal(c) (isdigit(c) || (c) == '.') |
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|
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#ifndef atof |
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extern double atof(); |
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#endif |
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extern char *fgets(), *savestr(); |
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extern char *emalloc(), *ecalloc(); |
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< |
extern EPNODE *curfunc; |
43 |
< |
extern double efunc(), evariable(); |
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< |
static double euminus(), eargument(), enumber(); |
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#ifdef INCHAN |
46 |
< |
static double echannel(); |
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#endif |
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static double eadd(), esubtr(), emult(), edivi(), epow(); |
49 |
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static double ebotch(); |
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> |
static double euminus(EPNODE *), eargument(EPNODE *), enumber(EPNODE *); |
39 |
> |
static double echannel(EPNODE *); |
40 |
> |
static double eadd(EPNODE *), esubtr(EPNODE *), |
41 |
> |
emult(EPNODE *), edivi(EPNODE *), |
42 |
> |
epow(EPNODE *); |
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static double ebotch(EPNODE *); |
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|
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unsigned int esupport = /* what to support */ |
46 |
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E_VARIABLE | E_FUNCTION ; |
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|
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int nextc; /* lookahead character */ |
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|
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double (*eoper[])() = { /* expression operations */ |
50 |
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double (*eoper[])(EPNODE *) = { /* expression operations */ |
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ebotch, |
55 |
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#ifdef VARIABLE |
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evariable, |
57 |
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#else |
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ebotch, |
59 |
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#endif |
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enumber, |
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euminus, |
62 |
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#ifdef INCHAN |
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echannel, |
64 |
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#else |
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ebotch, |
66 |
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#endif |
67 |
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#ifdef FUNCTION |
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efunc, |
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eargument, |
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#else |
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ebotch, |
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ebotch, |
73 |
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#endif |
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ebotch, |
75 |
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ebotch, |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
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0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, |
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emult, |
88 |
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EPNODE *ep; |
89 |
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|
90 |
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initstr(expr, NULL, 0); |
107 |
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#if defined(VARIABLE) && defined(FUNCTION) |
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curfunc = NULL; |
109 |
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#endif |
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ep = getE1(); |
93 |
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if (nextc != EOF) |
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syntax("unexpected character"); |
110 |
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} |
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|
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|
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int |
114 |
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epcmp(ep1, ep2) /* compare two expressions for equivalence */ |
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register EPNODE *ep1, *ep2; |
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{ |
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double d; |
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|
119 |
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if (ep1->type != ep2->type) |
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return(1); |
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|
122 |
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switch (ep1->type) { |
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|
124 |
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case VAR: |
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return(ep1->v.ln != ep2->v.ln); |
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|
127 |
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case NUM: |
128 |
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if (ep2->v.num == 0) |
129 |
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return(ep1->v.num != 0); |
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d = ep1->v.num / ep2->v.num; |
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return((d > 1.000000000001) | (d < 0.999999999999)); |
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|
133 |
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case CHAN: |
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case ARG: |
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return(ep1->v.chan != ep2->v.chan); |
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|
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case '=': |
138 |
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case ':': |
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return(epcmp(ep1->v.kid->sibling, ep2->v.kid->sibling)); |
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|
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case TICK: |
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case SYM: /* should never get this one */ |
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return(0); |
144 |
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|
145 |
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default: |
146 |
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ep1 = ep1->v.kid; |
147 |
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ep2 = ep2->v.kid; |
148 |
+ |
while (ep1 != NULL) { |
149 |
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if (ep2 == NULL) |
150 |
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return(1); |
151 |
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if (epcmp(ep1, ep2)) |
152 |
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return(1); |
153 |
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ep1 = ep1->sibling; |
154 |
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ep2 = ep2->sibling; |
155 |
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} |
156 |
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return(ep2 != NULL); |
157 |
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} |
158 |
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} |
159 |
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|
160 |
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|
161 |
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void |
162 |
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epfree(epar) /* free a parse tree */ |
163 |
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register EPNODE *epar; |
164 |
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{ |
166 |
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|
167 |
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switch (epar->type) { |
168 |
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|
138 |
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#if defined(VARIABLE) || defined(FUNCTION) |
169 |
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case VAR: |
170 |
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varfree(epar->v.ln); |
171 |
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break; |
173 |
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case SYM: |
174 |
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freestr(epar->v.name); |
175 |
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break; |
146 |
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#endif |
176 |
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|
177 |
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case NUM: |
178 |
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case CHAN: |
193 |
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} |
194 |
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|
195 |
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/* the following used to be a switch */ |
167 |
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#ifdef FUNCTION |
196 |
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static double |
197 |
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eargument(ep) |
198 |
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EPNODE *ep; |
199 |
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{ |
200 |
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return(argument(ep->v.chan)); |
201 |
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} |
174 |
– |
#endif |
202 |
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|
203 |
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static double |
204 |
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enumber(ep) |
216 |
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return(-evalue(ep1)); |
217 |
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} |
218 |
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|
192 |
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#ifdef INCHAN |
219 |
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static double |
220 |
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echannel(ep) |
221 |
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EPNODE *ep; |
222 |
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{ |
223 |
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return(chanvalue(ep->v.chan)); |
224 |
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} |
199 |
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#endif |
225 |
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|
226 |
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static double |
227 |
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eadd(ep) |
281 |
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if (!finite(d)) |
282 |
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errno = EDOM; |
283 |
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#endif |
284 |
< |
if (errno) { |
284 |
> |
if (errno == EDOM || errno == ERANGE) { |
285 |
|
wputs("Illegal power\n"); |
286 |
|
return(0.0); |
287 |
|
} |
295 |
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{ |
296 |
|
eputs("Bad expression!\n"); |
297 |
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quit(1); |
298 |
+ |
return 0.0; /* pro forma return */ |
299 |
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} |
300 |
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|
301 |
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|
326 |
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} |
327 |
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|
328 |
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|
329 |
+ |
void |
330 |
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initfile(fp, fn, ln) /* prepare input file */ |
331 |
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FILE *fp; |
332 |
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char *fn; |
344 |
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} |
345 |
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|
346 |
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|
347 |
+ |
void |
348 |
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initstr(s, fn, ln) /* prepare input string */ |
349 |
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char *s; |
350 |
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char *fn; |
359 |
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} |
360 |
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|
361 |
|
|
362 |
+ |
void |
363 |
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getscanpos(fnp, lnp, spp, fpp) /* return current scan position */ |
364 |
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char **fnp; |
365 |
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int *lnp; |
431 |
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} |
432 |
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|
433 |
|
|
434 |
+ |
void |
435 |
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syntax(err) /* report syntax error and quit */ |
436 |
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char *err; |
437 |
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{ |
457 |
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} |
458 |
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|
459 |
|
|
460 |
+ |
void |
461 |
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addekid(ep, ekid) /* add a child to ep */ |
462 |
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register EPNODE *ep; |
463 |
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EPNODE *ekid; |
473 |
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} |
474 |
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|
475 |
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|
445 |
– |
#if defined(VARIABLE) || defined(FUNCTION) |
476 |
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char * |
477 |
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getname() /* scan an identifier */ |
478 |
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{ |
479 |
< |
static char str[MAXWORD+1]; |
479 |
> |
static char str[RMAXWORD+1]; |
480 |
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register int i, lnext; |
481 |
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|
482 |
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lnext = nextc; |
483 |
< |
for (i = 0; i < MAXWORD && isid(lnext); i++, lnext = scan()) |
483 |
> |
for (i = 0; i < RMAXWORD && isid(lnext); i++, lnext = scan()) |
484 |
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str[i] = lnext; |
485 |
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str[i] = '\0'; |
486 |
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while (isid(lnext)) /* skip rest of name */ |
488 |
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|
489 |
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return(str); |
490 |
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} |
461 |
– |
#endif |
491 |
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|
492 |
|
|
493 |
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int |
509 |
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getnum() /* scan a positive float */ |
510 |
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{ |
511 |
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register int i, lnext; |
512 |
< |
char str[MAXWORD+1]; |
512 |
> |
char str[RMAXWORD+1]; |
513 |
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|
514 |
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i = 0; |
515 |
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lnext = nextc; |
516 |
< |
while (isdigit(lnext) && i < MAXWORD) { |
516 |
> |
while (isdigit(lnext) && i < RMAXWORD) { |
517 |
|
str[i++] = lnext; |
518 |
|
lnext = scan(); |
519 |
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} |
520 |
< |
if (lnext == '.' && i < MAXWORD) { |
520 |
> |
if (lnext == '.' && i < RMAXWORD) { |
521 |
|
str[i++] = lnext; |
522 |
|
lnext = scan(); |
523 |
< |
while (isdigit(lnext) && i < MAXWORD) { |
523 |
> |
if (i == 1 && !isdigit(lnext)) |
524 |
> |
syntax("badly formed number"); |
525 |
> |
while (isdigit(lnext) && i < RMAXWORD) { |
526 |
|
str[i++] = lnext; |
527 |
|
lnext = scan(); |
528 |
|
} |
529 |
|
} |
530 |
< |
if ((lnext == 'e' || lnext == 'E') && i < MAXWORD) { |
530 |
> |
if ((lnext == 'e') | (lnext == 'E') && i < RMAXWORD) { |
531 |
|
str[i++] = lnext; |
532 |
|
lnext = scan(); |
533 |
< |
if ((lnext == '-' || lnext == '+') && i < MAXWORD) { |
533 |
> |
if ((lnext == '-') | (lnext == '+') && i < RMAXWORD) { |
534 |
|
str[i++] = lnext; |
535 |
|
lnext = scan(); |
536 |
|
} |
537 |
< |
while (isdigit(lnext) && i < MAXWORD) { |
537 |
> |
if (!isdigit(lnext)) |
538 |
> |
syntax("missing exponent"); |
539 |
> |
while (isdigit(lnext) && i < RMAXWORD) { |
540 |
|
str[i++] = lnext; |
541 |
|
lnext = scan(); |
542 |
|
} |
560 |
|
scan(); |
561 |
|
addekid(ep2, ep1); |
562 |
|
addekid(ep2, getE2()); |
563 |
< |
#ifdef RCONST |
564 |
< |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
563 |
> |
if (esupport&E_RCONST && |
564 |
> |
ep1->type == NUM && ep1->sibling->type == NUM) |
565 |
|
ep2 = rconst(ep2); |
533 |
– |
#endif |
566 |
|
ep1 = ep2; |
567 |
|
} |
568 |
|
return(ep1); |
582 |
|
scan(); |
583 |
|
addekid(ep2, ep1); |
584 |
|
addekid(ep2, getE3()); |
585 |
< |
#ifdef RCONST |
586 |
< |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
585 |
> |
if (esupport&E_RCONST && |
586 |
> |
ep1->type == NUM && ep1->sibling->type == NUM) |
587 |
|
ep2 = rconst(ep2); |
556 |
– |
#endif |
588 |
|
ep1 = ep2; |
589 |
|
} |
590 |
|
return(ep1); |
604 |
|
scan(); |
605 |
|
addekid(ep2, ep1); |
606 |
|
addekid(ep2, getE3()); |
607 |
< |
#ifdef RCONST |
608 |
< |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
607 |
> |
if (esupport&E_RCONST && |
608 |
> |
ep1->type == NUM && ep1->sibling->type == NUM) |
609 |
|
ep2 = rconst(ep2); |
579 |
– |
#endif |
610 |
|
return(ep2); |
611 |
|
} |
612 |
|
return(ep1); |
649 |
|
/* FUNC(E1,..) */ |
650 |
|
/* ARG */ |
651 |
|
{ |
652 |
< |
int i; |
653 |
< |
char *nam; |
654 |
< |
register EPNODE *ep1, *ep2; |
652 |
> |
int i; |
653 |
> |
char *nam; |
654 |
> |
register EPNODE *ep1, *ep2; |
655 |
|
|
656 |
< |
if (nextc == '(') { |
657 |
< |
scan(); |
658 |
< |
ep1 = getE1(); |
659 |
< |
if (nextc != ')') |
660 |
< |
syntax("')' expected"); |
661 |
< |
scan(); |
662 |
< |
return(ep1); |
663 |
< |
} |
656 |
> |
if (nextc == '(') { |
657 |
> |
scan(); |
658 |
> |
ep1 = getE1(); |
659 |
> |
if (nextc != ')') |
660 |
> |
syntax("')' expected"); |
661 |
> |
scan(); |
662 |
> |
return(ep1); |
663 |
> |
} |
664 |
|
|
665 |
< |
#ifdef INCHAN |
666 |
< |
if (nextc == '$') { |
667 |
< |
scan(); |
668 |
< |
ep1 = newnode(); |
669 |
< |
ep1->type = CHAN; |
670 |
< |
ep1->v.chan = getinum(); |
671 |
< |
return(ep1); |
642 |
< |
} |
643 |
< |
#endif |
665 |
> |
if (esupport&E_INCHAN && nextc == '$') { |
666 |
> |
scan(); |
667 |
> |
ep1 = newnode(); |
668 |
> |
ep1->type = CHAN; |
669 |
> |
ep1->v.chan = getinum(); |
670 |
> |
return(ep1); |
671 |
> |
} |
672 |
|
|
673 |
< |
#if defined(VARIABLE) || defined(FUNCTION) |
674 |
< |
if (isalpha(nextc) || nextc == CNTXMARK) { |
675 |
< |
nam = getname(); |
676 |
< |
#if defined(VARIABLE) && defined(FUNCTION) |
677 |
< |
ep1 = NULL; |
678 |
< |
if (curfunc != NULL) |
679 |
< |
for (i = 1, ep2 = curfunc->v.kid->sibling; |
680 |
< |
ep2 != NULL; i++, ep2 = ep2->sibling) |
681 |
< |
if (!strcmp(ep2->v.name, nam)) { |
682 |
< |
ep1 = newnode(); |
683 |
< |
ep1->type = ARG; |
684 |
< |
ep1->v.chan = i; |
685 |
< |
break; |
673 |
> |
if (esupport&(E_VARIABLE|E_FUNCTION) && |
674 |
> |
(isalpha(nextc) || nextc == CNTXMARK)) { |
675 |
> |
nam = getname(); |
676 |
> |
ep1 = NULL; |
677 |
> |
if ((esupport&(E_VARIABLE|E_FUNCTION)) == (E_VARIABLE|E_FUNCTION) |
678 |
> |
&& curfunc != NULL) |
679 |
> |
for (i = 1, ep2 = curfunc->v.kid->sibling; |
680 |
> |
ep2 != NULL; i++, ep2 = ep2->sibling) |
681 |
> |
if (!strcmp(ep2->v.name, nam)) { |
682 |
> |
ep1 = newnode(); |
683 |
> |
ep1->type = ARG; |
684 |
> |
ep1->v.chan = i; |
685 |
> |
break; |
686 |
> |
} |
687 |
> |
if (ep1 == NULL) { |
688 |
> |
ep1 = newnode(); |
689 |
> |
ep1->type = VAR; |
690 |
> |
ep1->v.ln = varinsert(nam); |
691 |
|
} |
692 |
< |
if (ep1 == NULL) |
693 |
< |
#endif |
694 |
< |
{ |
695 |
< |
ep1 = newnode(); |
696 |
< |
ep1->type = VAR; |
697 |
< |
ep1->v.ln = varinsert(nam); |
692 |
> |
if (esupport&E_FUNCTION && nextc == '(') { |
693 |
> |
ep2 = newnode(); |
694 |
> |
ep2->type = FUNC; |
695 |
> |
addekid(ep2, ep1); |
696 |
> |
ep1 = ep2; |
697 |
> |
do { |
698 |
> |
scan(); |
699 |
> |
addekid(ep1, getE1()); |
700 |
> |
} while (nextc == ','); |
701 |
> |
if (nextc != ')') |
702 |
> |
syntax("')' expected"); |
703 |
> |
scan(); |
704 |
> |
} else if (!(esupport&E_VARIABLE)) |
705 |
> |
syntax("'(' expected"); |
706 |
> |
if (esupport&E_RCONST && isconstvar(ep1)) |
707 |
> |
ep1 = rconst(ep1); |
708 |
> |
return(ep1); |
709 |
|
} |
666 |
– |
#ifdef FUNCTION |
667 |
– |
if (nextc == '(') { |
668 |
– |
ep2 = newnode(); |
669 |
– |
ep2->type = FUNC; |
670 |
– |
addekid(ep2, ep1); |
671 |
– |
ep1 = ep2; |
672 |
– |
do { |
673 |
– |
scan(); |
674 |
– |
addekid(ep1, getE1()); |
675 |
– |
} while (nextc == ','); |
676 |
– |
if (nextc != ')') |
677 |
– |
syntax("')' expected"); |
678 |
– |
scan(); |
679 |
– |
} |
680 |
– |
#ifndef VARIABLE |
681 |
– |
else |
682 |
– |
syntax("'(' expected"); |
683 |
– |
#endif |
684 |
– |
#endif |
685 |
– |
#ifdef RCONST |
686 |
– |
if (isconstvar(ep1)) |
687 |
– |
ep1 = rconst(ep1); |
688 |
– |
#endif |
689 |
– |
return(ep1); |
690 |
– |
} |
691 |
– |
#endif |
710 |
|
|
711 |
< |
if (isdecimal(nextc)) { |
712 |
< |
ep1 = newnode(); |
713 |
< |
ep1->type = NUM; |
714 |
< |
ep1->v.num = getnum(); |
715 |
< |
return(ep1); |
716 |
< |
} |
717 |
< |
syntax("unexpected character"); |
711 |
> |
if (isdecimal(nextc)) { |
712 |
> |
ep1 = newnode(); |
713 |
> |
ep1->type = NUM; |
714 |
> |
ep1->v.num = getnum(); |
715 |
> |
return(ep1); |
716 |
> |
} |
717 |
> |
syntax("unexpected character"); |
718 |
> |
return NULL; /* pro forma return */ |
719 |
|
} |
720 |
|
|
721 |
|
|
703 |
– |
#ifdef RCONST |
722 |
|
EPNODE * |
723 |
|
rconst(epar) /* reduce a constant expression */ |
724 |
|
register EPNODE *epar; |
729 |
|
ep->type = NUM; |
730 |
|
errno = 0; |
731 |
|
ep->v.num = evalue(epar); |
732 |
< |
if (errno) |
732 |
> |
if (errno == EDOM || errno == ERANGE) |
733 |
|
syntax("bad constant expression"); |
734 |
|
epfree(epar); |
735 |
|
|
737 |
|
} |
738 |
|
|
739 |
|
|
740 |
+ |
int |
741 |
|
isconstvar(ep) /* is ep linked to a constant expression? */ |
742 |
|
register EPNODE *ep; |
743 |
|
{ |
725 |
– |
#ifdef VARIABLE |
744 |
|
register EPNODE *ep1; |
727 |
– |
#ifdef FUNCTION |
745 |
|
|
746 |
< |
if (ep->type == FUNC) { |
746 |
> |
if (esupport&E_FUNCTION && ep->type == FUNC) { |
747 |
|
if (!isconstfun(ep->v.kid)) |
748 |
|
return(0); |
749 |
|
for (ep1 = ep->v.kid->sibling; ep1 != NULL; ep1 = ep1->sibling) |
751 |
|
return(0); |
752 |
|
return(1); |
753 |
|
} |
737 |
– |
#endif |
754 |
|
if (ep->type != VAR) |
755 |
|
return(0); |
756 |
|
ep1 = ep->v.ln->def; |
757 |
|
if (ep1 == NULL || ep1->type != ':') |
758 |
|
return(0); |
759 |
< |
#ifdef FUNCTION |
744 |
< |
if (ep1->v.kid->type != SYM) |
759 |
> |
if (esupport&E_FUNCTION && ep1->v.kid->type != SYM) |
760 |
|
return(0); |
746 |
– |
#endif |
761 |
|
return(1); |
748 |
– |
#else |
749 |
– |
return(ep->type == FUNC); |
750 |
– |
#endif |
762 |
|
} |
763 |
|
|
764 |
|
|
765 |
< |
#if defined(FUNCTION) && defined(VARIABLE) |
765 |
> |
int |
766 |
|
isconstfun(ep) /* is ep linked to a constant function? */ |
767 |
|
register EPNODE *ep; |
768 |
|
{ |
771 |
|
|
772 |
|
if (ep->type != VAR) |
773 |
|
return(0); |
774 |
< |
if ((dp = ep->v.ln->def) != NULL && dp->v.kid->type == FUNC) |
775 |
< |
return(dp->type == ':'); |
774 |
> |
if ((dp = ep->v.ln->def) != NULL) { |
775 |
> |
if (dp->v.kid->type == FUNC) |
776 |
> |
return(dp->type == ':'); |
777 |
> |
else |
778 |
> |
return(0); /* don't identify masked library functions */ |
779 |
> |
} |
780 |
|
if ((lp = ep->v.ln->lib) != NULL) |
781 |
|
return(lp->atyp == ':'); |
782 |
|
return(0); |
783 |
|
} |
769 |
– |
#endif |
770 |
– |
#endif |