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/* Copyright (c) 1992 Regents of the University of California */ |
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#ifndef lint |
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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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|
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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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#include "copyright.h" |
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|
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#include <stdio.h> |
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#include <ctype.h> |
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#include <math.h> |
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#include <stdlib.h> |
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|
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#include "calcomp.h" |
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#define MAXLINE 256 /* maximum line length */ |
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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; |
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extern double efunc(), evariable(); |
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static double euminus(), echannel(), eargument(), enumber(); |
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static double euminus(), eargument(), enumber(); |
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static double echannel(); |
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static double eadd(), esubtr(), emult(), edivi(), epow(); |
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static double ebotch(); |
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|
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unsigned int esupport = /* what to support */ |
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E_VARIABLE | E_FUNCTION | E_REDEFW; |
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|
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int nextc; /* lookahead character */ |
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|
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double (*eoper[])() = { /* expression operations */ |
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ebotch, |
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#ifdef VARIABLE |
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evariable, |
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#else |
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ebotch, |
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#endif |
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enumber, |
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euminus, |
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#ifdef INCHAN |
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echannel, |
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#else |
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ebotch, |
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#endif |
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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, |
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#endif |
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ebotch, |
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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, |
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EPNODE *ep; |
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|
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initstr(expr, NULL, 0); |
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#if defined(VARIABLE) && defined(FUNCTION) |
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curfunc = NULL; |
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#endif |
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ep = getE1(); |
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if (nextc != EOF) |
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syntax("unexpected character"); |
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} |
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|
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|
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int |
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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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|
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if (ep1->type != ep2->type) |
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return(1); |
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|
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switch (ep1->type) { |
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|
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case VAR: |
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return(ep1->v.ln != ep2->v.ln); |
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|
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case NUM: |
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if (ep2->v.num == 0) |
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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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|
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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 '=': |
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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); |
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|
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default: |
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ep1 = ep1->v.kid; |
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ep2 = ep2->v.kid; |
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while (ep1 != NULL) { |
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if (ep2 == NULL) |
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return(1); |
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if (epcmp(ep1, ep2)) |
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return(1); |
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ep1 = ep1->sibling; |
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ep2 = ep2->sibling; |
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} |
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return(ep2 != NULL); |
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} |
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} |
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|
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|
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void |
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epfree(epar) /* free a parse tree */ |
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register EPNODE *epar; |
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{ |
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|
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switch (epar->type) { |
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#if defined(VARIABLE) || defined(FUNCTION) |
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case VAR: |
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varfree(epar->v.ln); |
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break; |
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case SYM: |
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freestr(epar->v.name); |
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break; |
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#endif |
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|
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case NUM: |
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case CHAN: |
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break; |
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|
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default: |
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< |
for (ep = epar->v.kid; ep != NULL; ep = ep->sibling) |
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while ((ep = epar->v.kid) != NULL) { |
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epar->v.kid = ep->sibling; |
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epfree(ep); |
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} |
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break; |
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|
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} |
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} |
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|
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/* the following used to be a switch */ |
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#ifdef FUNCTION |
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static double |
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eargument(ep) |
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EPNODE *ep; |
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{ |
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return(argument(ep->v.chan)); |
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} |
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#endif |
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|
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static double |
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enumber(ep) |
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return(-evalue(ep1)); |
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} |
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|
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#ifdef INCHAN |
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static double |
220 |
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echannel(ep) |
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EPNODE *ep; |
222 |
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{ |
223 |
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return(chanvalue(ep->v.chan)); |
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} |
194 |
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#endif |
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|
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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 |
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wputs("Illegal power\n"); |
286 |
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return(0.0); |
287 |
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} |
325 |
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} |
326 |
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|
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|
328 |
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void |
329 |
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initfile(fp, fn, ln) /* prepare input file */ |
330 |
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FILE *fp; |
331 |
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char *fn; |
343 |
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} |
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|
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|
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void |
347 |
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initstr(s, fn, ln) /* prepare input string */ |
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char *s; |
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char *fn; |
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} |
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|
360 |
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|
361 |
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void |
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getscanpos(fnp, lnp, spp, fpp) /* return current scan position */ |
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char **fnp; |
364 |
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int *lnp; |
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|
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char * |
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ltoa(l) /* convert long to ascii */ |
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long2ascii(l) /* convert long to ascii */ |
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long l; |
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{ |
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static char buf[16]; |
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} |
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|
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|
433 |
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void |
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syntax(err) /* report syntax error and quit */ |
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char *err; |
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{ |
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if (infile != NULL) eputs(infile); |
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if (lineno != 0) { |
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eputs(infile != NULL ? ", line " : "line "); |
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eputs(ltoa((long)lineno)); |
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> |
eputs(long2ascii((long)lineno)); |
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} |
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eputs(":\n"); |
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} |
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} |
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|
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|
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+ |
void |
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addekid(ep, ekid) /* add a child to ep */ |
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register EPNODE *ep; |
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EPNODE *ekid; |
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} |
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|
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|
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#if defined(VARIABLE) || defined(FUNCTION) |
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char * |
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getname() /* scan an identifier */ |
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{ |
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|
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return(str); |
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} |
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#endif |
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|
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|
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int |
519 |
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if (lnext == '.' && i < MAXWORD) { |
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str[i++] = lnext; |
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lnext = scan(); |
522 |
+ |
if (i == 1 && !isdigit(lnext)) |
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syntax("badly formed number"); |
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while (isdigit(lnext) && i < MAXWORD) { |
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str[i++] = lnext; |
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lnext = scan(); |
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} |
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} |
529 |
< |
if ((lnext == 'e' || lnext == 'E') && i < MAXWORD) { |
529 |
> |
if ((lnext == 'e' | lnext == 'E') && i < MAXWORD) { |
530 |
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str[i++] = lnext; |
531 |
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lnext = scan(); |
532 |
< |
if ((lnext == '-' || lnext == '+') && i < MAXWORD) { |
532 |
> |
if ((lnext == '-' | lnext == '+') && i < MAXWORD) { |
533 |
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str[i++] = lnext; |
534 |
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lnext = scan(); |
535 |
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} |
536 |
+ |
if (!isdigit(lnext)) |
537 |
+ |
syntax("missing exponent"); |
538 |
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while (isdigit(lnext) && i < MAXWORD) { |
539 |
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str[i++] = lnext; |
540 |
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lnext = scan(); |
559 |
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scan(); |
560 |
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addekid(ep2, ep1); |
561 |
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addekid(ep2, getE2()); |
562 |
< |
#ifdef RCONST |
563 |
< |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
562 |
> |
if (esupport&E_RCONST && |
563 |
> |
ep1->type == NUM && ep1->sibling->type == NUM) |
564 |
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ep2 = rconst(ep2); |
528 |
– |
#endif |
565 |
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ep1 = ep2; |
566 |
|
} |
567 |
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return(ep1); |
581 |
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scan(); |
582 |
|
addekid(ep2, ep1); |
583 |
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addekid(ep2, getE3()); |
584 |
< |
#ifdef RCONST |
585 |
< |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
584 |
> |
if (esupport&E_RCONST && |
585 |
> |
ep1->type == NUM && ep1->sibling->type == NUM) |
586 |
|
ep2 = rconst(ep2); |
551 |
– |
#endif |
587 |
|
ep1 = ep2; |
588 |
|
} |
589 |
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return(ep1); |
603 |
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scan(); |
604 |
|
addekid(ep2, ep1); |
605 |
|
addekid(ep2, getE3()); |
606 |
< |
#ifdef RCONST |
607 |
< |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
606 |
> |
if (esupport&E_RCONST && |
607 |
> |
ep1->type == NUM && ep1->sibling->type == NUM) |
608 |
|
ep2 = rconst(ep2); |
574 |
– |
#endif |
609 |
|
return(ep2); |
610 |
|
} |
611 |
|
return(ep1); |
661 |
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return(ep1); |
662 |
|
} |
663 |
|
|
664 |
< |
#ifdef INCHAN |
631 |
< |
if (nextc == '$') { |
664 |
> |
if (esupport&E_INCHAN && nextc == '$') { |
665 |
|
scan(); |
666 |
|
ep1 = newnode(); |
667 |
|
ep1->type = CHAN; |
668 |
|
ep1->v.chan = getinum(); |
669 |
|
return(ep1); |
670 |
|
} |
638 |
– |
#endif |
671 |
|
|
672 |
< |
#if defined(VARIABLE) || defined(FUNCTION) |
673 |
< |
if (isalpha(nextc) || nextc == CNTXMARK) { |
674 |
< |
nam = getname(); |
675 |
< |
#if defined(VARIABLE) && defined(FUNCTION) |
676 |
< |
ep1 = NULL; |
677 |
< |
if (curfunc != NULL) |
672 |
> |
if (esupport&(E_VARIABLE|E_FUNCTION) && |
673 |
> |
(isalpha(nextc) || nextc == CNTXMARK)) { |
674 |
> |
nam = getname(); |
675 |
> |
ep1 = NULL; |
676 |
> |
if ((esupport&(E_VARIABLE|E_FUNCTION)) == (E_VARIABLE|E_FUNCTION) |
677 |
> |
&& curfunc != NULL) |
678 |
|
for (i = 1, ep2 = curfunc->v.kid->sibling; |
679 |
|
ep2 != NULL; i++, ep2 = ep2->sibling) |
680 |
|
if (!strcmp(ep2->v.name, nam)) { |
683 |
|
ep1->v.chan = i; |
684 |
|
break; |
685 |
|
} |
686 |
< |
if (ep1 == NULL) |
655 |
< |
#endif |
656 |
< |
{ |
686 |
> |
if (ep1 == NULL) { |
687 |
|
ep1 = newnode(); |
688 |
|
ep1->type = VAR; |
689 |
|
ep1->v.ln = varinsert(nam); |
690 |
|
} |
691 |
< |
#ifdef FUNCTION |
662 |
< |
if (nextc == '(') { |
691 |
> |
if (esupport&E_FUNCTION && nextc == '(') { |
692 |
|
ep2 = newnode(); |
693 |
|
ep2->type = FUNC; |
694 |
|
addekid(ep2, ep1); |
700 |
|
if (nextc != ')') |
701 |
|
syntax("')' expected"); |
702 |
|
scan(); |
703 |
< |
} |
675 |
< |
#ifndef VARIABLE |
676 |
< |
else |
703 |
> |
} else if (!(esupport&E_VARIABLE)) |
704 |
|
syntax("'(' expected"); |
705 |
< |
#endif |
679 |
< |
#endif |
680 |
< |
#ifdef RCONST |
681 |
< |
if (isconstvar(ep1)) |
705 |
> |
if (esupport&E_RCONST && isconstvar(ep1)) |
706 |
|
ep1 = rconst(ep1); |
683 |
– |
#endif |
707 |
|
return(ep1); |
708 |
|
} |
686 |
– |
#endif |
709 |
|
|
710 |
|
if (isdecimal(nextc)) { |
711 |
|
ep1 = newnode(); |
717 |
|
} |
718 |
|
|
719 |
|
|
698 |
– |
#ifdef RCONST |
720 |
|
EPNODE * |
721 |
|
rconst(epar) /* reduce a constant expression */ |
722 |
|
register EPNODE *epar; |
727 |
|
ep->type = NUM; |
728 |
|
errno = 0; |
729 |
|
ep->v.num = evalue(epar); |
730 |
< |
if (errno) |
730 |
> |
if (errno == EDOM || errno == ERANGE) |
731 |
|
syntax("bad constant expression"); |
732 |
|
epfree(epar); |
733 |
|
|
735 |
|
} |
736 |
|
|
737 |
|
|
738 |
+ |
int |
739 |
|
isconstvar(ep) /* is ep linked to a constant expression? */ |
740 |
|
register EPNODE *ep; |
741 |
|
{ |
720 |
– |
#ifdef VARIABLE |
742 |
|
register EPNODE *ep1; |
722 |
– |
#ifdef FUNCTION |
743 |
|
|
744 |
< |
if (ep->type == FUNC) { |
744 |
> |
if (esupport&E_FUNCTION && ep->type == FUNC) { |
745 |
|
if (!isconstfun(ep->v.kid)) |
746 |
|
return(0); |
747 |
|
for (ep1 = ep->v.kid->sibling; ep1 != NULL; ep1 = ep1->sibling) |
749 |
|
return(0); |
750 |
|
return(1); |
751 |
|
} |
732 |
– |
#endif |
752 |
|
if (ep->type != VAR) |
753 |
|
return(0); |
754 |
|
ep1 = ep->v.ln->def; |
755 |
|
if (ep1 == NULL || ep1->type != ':') |
756 |
|
return(0); |
757 |
< |
#ifdef FUNCTION |
739 |
< |
if (ep1->v.kid->type != SYM) |
757 |
> |
if (esupport&E_FUNCTION && ep1->v.kid->type != SYM) |
758 |
|
return(0); |
741 |
– |
#endif |
759 |
|
return(1); |
743 |
– |
#else |
744 |
– |
return(ep->type == FUNC); |
745 |
– |
#endif |
760 |
|
} |
761 |
|
|
762 |
|
|
763 |
< |
#if defined(FUNCTION) && defined(VARIABLE) |
763 |
> |
int |
764 |
|
isconstfun(ep) /* is ep linked to a constant function? */ |
765 |
|
register EPNODE *ep; |
766 |
|
{ |
769 |
|
|
770 |
|
if (ep->type != VAR) |
771 |
|
return(0); |
772 |
< |
if ((dp = ep->v.ln->def) != NULL && dp->v.kid->type == FUNC) |
773 |
< |
return(dp->type == ':'); |
772 |
> |
if ((dp = ep->v.ln->def) != NULL) |
773 |
> |
if (dp->v.kid->type == FUNC) |
774 |
> |
return(dp->type == ':'); |
775 |
> |
else |
776 |
> |
return(0); /* don't identify masked library functions */ |
777 |
|
if ((lp = ep->v.ln->lib) != NULL) |
778 |
|
return(lp->atyp == ':'); |
779 |
|
return(0); |
780 |
|
} |
764 |
– |
#endif |
765 |
– |
#endif |