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/* Copyright (c) 1986 Regents of the University of California */ |
2 |
|
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#ifndef lint |
4 |
static char SCCSid[] = "$SunId$ LBL"; |
5 |
#endif |
6 |
|
7 |
/* |
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* Compute data values using expression parser |
9 |
* |
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* 7/1/85 Greg Ward |
11 |
* |
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* 11/11/85 Made channel input conditional with (INCHAN) compiles. |
13 |
* |
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* 4/2/86 Added conditional compiles for function definitions (FUNCTION). |
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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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|
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#include <stdio.h> |
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|
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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 "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 newnode() (EPNODE *)ecalloc(1, sizeof(EPNODE)) |
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|
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#define isdecimal(c) (isdigit(c) || (c) == '.') |
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|
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extern double atof(), pow(); |
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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 eadd(), esubtr(), emult(), edivi(), epow(); |
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static double ebotch(); |
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extern int errno; |
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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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eadd, |
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0, |
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esubtr, |
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0, |
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edivi, |
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0,0,0,0,0,0,0,0,0,0, |
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ebotch, |
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0,0, |
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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, |
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epow, |
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}; |
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|
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static FILE *infp; /* input file pointer */ |
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static char *linbuf; /* line buffer */ |
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static char *infile; /* input file name */ |
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static int lineno; /* input line number */ |
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static int linepos; /* position in buffer */ |
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|
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|
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EPNODE * |
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eparse(expr) /* parse an expression string */ |
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char *expr; |
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{ |
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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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return(ep); |
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} |
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|
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|
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double |
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eval(expr) /* evaluate an expression string */ |
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char *expr; |
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{ |
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register EPNODE *ep; |
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double rval; |
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|
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ep = eparse(expr); |
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rval = evalue(ep); |
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epfree(ep); |
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return(rval); |
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} |
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|
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|
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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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register EPNODE *ep; |
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|
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switch (epar->type) { |
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|
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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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#endif |
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|
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case SYM: |
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freestr(epar->v.name); |
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break; |
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|
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case NUM: |
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case CHAN: |
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case ARG: |
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case TICK: |
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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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epfree(ep); |
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break; |
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|
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} |
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|
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efree((char *)epar); |
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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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EPNODE *ep; |
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{ |
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return(ep->v.num); |
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} |
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|
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static double |
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euminus(ep) |
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EPNODE *ep; |
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{ |
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register EPNODE *ep1 = ep->v.kid; |
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|
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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 |
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echannel(ep) |
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EPNODE *ep; |
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{ |
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return(chanvalue(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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eadd(ep) |
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EPNODE *ep; |
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{ |
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register EPNODE *ep1 = ep->v.kid; |
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|
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return(evalue(ep1) + evalue(ep1->sibling)); |
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} |
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|
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static double |
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esubtr(ep) |
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EPNODE *ep; |
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{ |
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register EPNODE *ep1 = ep->v.kid; |
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|
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return(evalue(ep1) - evalue(ep1->sibling)); |
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} |
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|
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static double |
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emult(ep) |
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EPNODE *ep; |
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{ |
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register EPNODE *ep1 = ep->v.kid; |
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|
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return(evalue(ep1) * evalue(ep1->sibling)); |
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} |
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|
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static double |
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edivi(ep) |
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EPNODE *ep; |
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{ |
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register EPNODE *ep1 = ep->v.kid; |
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double d; |
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|
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d = evalue(ep1->sibling); |
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if (d == 0.0) { |
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wputs("Division by zero\n"); |
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errno = ERANGE; |
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return(0.0); |
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} |
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return(evalue(ep1) / d); |
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} |
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|
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static double |
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epow(ep) |
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EPNODE *ep; |
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{ |
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register EPNODE *ep1 = ep->v.kid; |
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double d; |
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int lasterrno; |
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|
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lasterrno = errno; |
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errno = 0; |
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d = pow(evalue(ep1), evalue(ep1->sibling)); |
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#ifdef IEEE |
248 |
if (!finite(d)) |
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errno = EDOM; |
250 |
#endif |
251 |
if (errno) { |
252 |
wputs("Illegal power\n"); |
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return(0.0); |
254 |
} |
255 |
errno = lasterrno; |
256 |
return(d); |
257 |
} |
258 |
|
259 |
static double |
260 |
ebotch(ep) |
261 |
EPNODE *ep; |
262 |
{ |
263 |
eputs("Bad expression!\n"); |
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quit(1); |
265 |
} |
266 |
|
267 |
|
268 |
EPNODE * |
269 |
ekid(ep, n) /* return pointer to a node's nth kid */ |
270 |
register EPNODE *ep; |
271 |
register int n; |
272 |
{ |
273 |
|
274 |
for (ep = ep->v.kid; ep != NULL; ep = ep->sibling) |
275 |
if (--n < 0) |
276 |
break; |
277 |
|
278 |
return(ep); |
279 |
} |
280 |
|
281 |
|
282 |
int |
283 |
nekids(ep) /* return # of kids for node ep */ |
284 |
register EPNODE *ep; |
285 |
{ |
286 |
register int n = 0; |
287 |
|
288 |
for (ep = ep->v.kid; ep != NULL; ep = ep->sibling) |
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n++; |
290 |
|
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return(n); |
292 |
} |
293 |
|
294 |
|
295 |
initfile(fp, fn, ln) /* prepare input file */ |
296 |
FILE *fp; |
297 |
char *fn; |
298 |
int ln; |
299 |
{ |
300 |
static char inpbuf[MAXLINE]; |
301 |
|
302 |
infp = fp; |
303 |
linbuf = inpbuf; |
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infile = fn; |
305 |
lineno = ln; |
306 |
linepos = 0; |
307 |
inpbuf[0] = '\0'; |
308 |
scan(); |
309 |
} |
310 |
|
311 |
|
312 |
initstr(s, fn, ln) /* prepare input string */ |
313 |
char *s; |
314 |
char *fn; |
315 |
int ln; |
316 |
{ |
317 |
infp = NULL; |
318 |
infile = fn; |
319 |
lineno = ln; |
320 |
linbuf = s; |
321 |
linepos = 0; |
322 |
scan(); |
323 |
} |
324 |
|
325 |
|
326 |
getscanpos(fnp, lnp, spp, fpp) /* return current scan position */ |
327 |
char **fnp; |
328 |
int *lnp; |
329 |
char **spp; |
330 |
FILE **fpp; |
331 |
{ |
332 |
if (fnp != NULL) *fnp = infile; |
333 |
if (lnp != NULL) *lnp = lineno; |
334 |
if (spp != NULL) *spp = linbuf+linepos; |
335 |
if (fpp != NULL) *fpp = infp; |
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} |
337 |
|
338 |
|
339 |
int |
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scan() /* scan next character, return literal next */ |
341 |
{ |
342 |
register int lnext = 0; |
343 |
|
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do { |
345 |
if (linbuf[linepos] == '\0') |
346 |
if (infp == NULL || fgets(linbuf, MAXLINE, infp) == NULL) |
347 |
nextc = EOF; |
348 |
else { |
349 |
nextc = linbuf[0]; |
350 |
lineno++; |
351 |
linepos = 1; |
352 |
} |
353 |
else |
354 |
nextc = linbuf[linepos++]; |
355 |
if (!lnext) |
356 |
lnext = nextc; |
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if (nextc == '{') { |
358 |
scan(); |
359 |
while (nextc != '}') |
360 |
if (nextc == EOF) |
361 |
syntax("'}' expected"); |
362 |
else |
363 |
scan(); |
364 |
scan(); |
365 |
} |
366 |
} while (isspace(nextc)); |
367 |
return(lnext); |
368 |
} |
369 |
|
370 |
|
371 |
char * |
372 |
ltoa(l) /* convert long to ascii */ |
373 |
long l; |
374 |
{ |
375 |
static char buf[16]; |
376 |
register char *cp; |
377 |
int neg = 0; |
378 |
|
379 |
if (l == 0) |
380 |
return("0"); |
381 |
if (l < 0) { |
382 |
l = -l; |
383 |
neg++; |
384 |
} |
385 |
cp = buf + sizeof(buf); |
386 |
*--cp = '\0'; |
387 |
while (l) { |
388 |
*--cp = l % 10 + '0'; |
389 |
l /= 10; |
390 |
} |
391 |
if (neg) |
392 |
*--cp = '-'; |
393 |
return(cp); |
394 |
} |
395 |
|
396 |
|
397 |
syntax(err) /* report syntax error and quit */ |
398 |
char *err; |
399 |
{ |
400 |
register int i; |
401 |
|
402 |
if (infile != NULL || lineno != 0) { |
403 |
if (infile != NULL) eputs(infile); |
404 |
if (lineno != 0) { |
405 |
eputs(infile != NULL ? ", line " : "line "); |
406 |
eputs(ltoa((long)lineno)); |
407 |
} |
408 |
eputs(": syntax error:\n"); |
409 |
} |
410 |
eputs(linbuf); |
411 |
if (linbuf[strlen(linbuf)-1] != '\n') |
412 |
eputs("\n"); |
413 |
for (i = 0; i < linepos-1; i++) |
414 |
eputs(linbuf[i] == '\t' ? "\t" : " "); |
415 |
eputs("^ "); |
416 |
eputs(err); |
417 |
eputs("\n"); |
418 |
quit(1); |
419 |
} |
420 |
|
421 |
|
422 |
addekid(ep, ekid) /* add a child to ep */ |
423 |
register EPNODE *ep; |
424 |
EPNODE *ekid; |
425 |
{ |
426 |
if (ep->v.kid == NULL) |
427 |
ep->v.kid = ekid; |
428 |
else { |
429 |
for (ep = ep->v.kid; ep->sibling != NULL; ep = ep->sibling) |
430 |
; |
431 |
ep->sibling = ekid; |
432 |
} |
433 |
ekid->sibling = NULL; |
434 |
} |
435 |
|
436 |
|
437 |
char * |
438 |
getname() /* scan an identifier */ |
439 |
{ |
440 |
static char str[MAXWORD+1]; |
441 |
register int i, lnext; |
442 |
|
443 |
lnext = nextc; |
444 |
for (i = 0; i < MAXWORD && isid(lnext); i++, lnext = scan()) |
445 |
str[i] = lnext; |
446 |
str[i] = '\0'; |
447 |
|
448 |
return(str); |
449 |
} |
450 |
|
451 |
|
452 |
int |
453 |
getinum() /* scan a positive integer */ |
454 |
{ |
455 |
register int n, lnext; |
456 |
|
457 |
n = 0; |
458 |
lnext = nextc; |
459 |
while (isdigit(lnext)) { |
460 |
n = n * 10 + lnext - '0'; |
461 |
lnext = scan(); |
462 |
} |
463 |
return(n); |
464 |
} |
465 |
|
466 |
|
467 |
double |
468 |
getnum() /* scan a positive float */ |
469 |
{ |
470 |
register int i, lnext; |
471 |
char str[MAXWORD+1]; |
472 |
|
473 |
i = 0; |
474 |
lnext = nextc; |
475 |
while (isdigit(lnext) && i < MAXWORD) { |
476 |
str[i++] = lnext; |
477 |
lnext = scan(); |
478 |
} |
479 |
if (lnext == '.' && i < MAXWORD) { |
480 |
str[i++] = lnext; |
481 |
lnext = scan(); |
482 |
while (isdigit(lnext) && i < MAXWORD) { |
483 |
str[i++] = lnext; |
484 |
lnext = scan(); |
485 |
} |
486 |
} |
487 |
if ((lnext == 'e' || lnext == 'E') && i < MAXWORD) { |
488 |
str[i++] = lnext; |
489 |
lnext = scan(); |
490 |
if ((lnext == '-' || lnext == '+') && i < MAXWORD) { |
491 |
str[i++] = lnext; |
492 |
lnext = scan(); |
493 |
} |
494 |
while (isdigit(lnext) && i < MAXWORD) { |
495 |
str[i++] = lnext; |
496 |
lnext = scan(); |
497 |
} |
498 |
} |
499 |
str[i] = '\0'; |
500 |
|
501 |
return(atof(str)); |
502 |
} |
503 |
|
504 |
|
505 |
EPNODE * |
506 |
getE1() /* E1 -> E1 ADDOP E2 */ |
507 |
/* E2 */ |
508 |
{ |
509 |
register EPNODE *ep1, *ep2; |
510 |
|
511 |
ep1 = getE2(); |
512 |
while (nextc == '+' || nextc == '-') { |
513 |
ep2 = newnode(); |
514 |
ep2->type = nextc; |
515 |
scan(); |
516 |
addekid(ep2, ep1); |
517 |
addekid(ep2, getE2()); |
518 |
#ifdef RCONST |
519 |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
520 |
ep2 = rconst(ep2); |
521 |
#endif |
522 |
ep1 = ep2; |
523 |
} |
524 |
return(ep1); |
525 |
} |
526 |
|
527 |
|
528 |
EPNODE * |
529 |
getE2() /* E2 -> E2 MULOP E3 */ |
530 |
/* E3 */ |
531 |
{ |
532 |
register EPNODE *ep1, *ep2; |
533 |
|
534 |
ep1 = getE3(); |
535 |
while (nextc == '*' || nextc == '/') { |
536 |
ep2 = newnode(); |
537 |
ep2->type = nextc; |
538 |
scan(); |
539 |
addekid(ep2, ep1); |
540 |
addekid(ep2, getE3()); |
541 |
#ifdef RCONST |
542 |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
543 |
ep2 = rconst(ep2); |
544 |
#endif |
545 |
ep1 = ep2; |
546 |
} |
547 |
return(ep1); |
548 |
} |
549 |
|
550 |
|
551 |
EPNODE * |
552 |
getE3() /* E3 -> E4 ^ E3 */ |
553 |
/* E4 */ |
554 |
{ |
555 |
register EPNODE *ep1, *ep2; |
556 |
|
557 |
ep1 = getE4(); |
558 |
if (nextc == '^') { |
559 |
ep2 = newnode(); |
560 |
ep2->type = nextc; |
561 |
scan(); |
562 |
addekid(ep2, ep1); |
563 |
addekid(ep2, getE3()); |
564 |
#ifdef RCONST |
565 |
if (ep1->type == NUM && ep1->sibling->type == NUM) |
566 |
ep2 = rconst(ep2); |
567 |
#endif |
568 |
return(ep2); |
569 |
} |
570 |
return(ep1); |
571 |
} |
572 |
|
573 |
|
574 |
EPNODE * |
575 |
getE4() /* E4 -> ADDOP E5 */ |
576 |
/* E5 */ |
577 |
{ |
578 |
register EPNODE *ep1, *ep2; |
579 |
|
580 |
if (nextc == '-') { |
581 |
scan(); |
582 |
ep2 = getE5(); |
583 |
if (ep2->type == NUM) { |
584 |
ep2->v.num = -ep2->v.num; |
585 |
return(ep2); |
586 |
} |
587 |
ep1 = newnode(); |
588 |
ep1->type = UMINUS; |
589 |
addekid(ep1, ep2); |
590 |
return(ep1); |
591 |
} |
592 |
if (nextc == '+') |
593 |
scan(); |
594 |
return(getE5()); |
595 |
} |
596 |
|
597 |
|
598 |
EPNODE * |
599 |
getE5() /* E5 -> (E1) */ |
600 |
/* VAR */ |
601 |
/* NUM */ |
602 |
/* $N */ |
603 |
/* FUNC(E1,..) */ |
604 |
/* ARG */ |
605 |
{ |
606 |
int i; |
607 |
register EPNODE *ep1, *ep2; |
608 |
|
609 |
if (nextc == '(') { |
610 |
scan(); |
611 |
ep1 = getE1(); |
612 |
if (nextc != ')') |
613 |
syntax("')' expected"); |
614 |
scan(); |
615 |
return(ep1); |
616 |
} |
617 |
|
618 |
#ifdef INCHAN |
619 |
if (nextc == '$') { |
620 |
scan(); |
621 |
ep1 = newnode(); |
622 |
ep1->type = CHAN; |
623 |
ep1->v.chan = getinum(); |
624 |
return(ep1); |
625 |
} |
626 |
#endif |
627 |
|
628 |
#if defined(VARIABLE) || defined(FUNCTION) |
629 |
if (isalpha(nextc)) { |
630 |
ep1 = newnode(); |
631 |
ep1->type = VAR; |
632 |
ep1->v.ln = varinsert(getname()); |
633 |
|
634 |
#if defined(VARIABLE) && defined(FUNCTION) |
635 |
if (curfunc != NULL) |
636 |
for (i = 1, ep2 = curfunc->v.kid->sibling; |
637 |
ep2 != NULL; i++, ep2 = ep2->sibling) |
638 |
if (!strcmp(ep2->v.name, ep1->v.ln->name)) { |
639 |
epfree(ep1); |
640 |
ep1 = newnode(); |
641 |
ep1->type = ARG; |
642 |
ep1->v.chan = i; |
643 |
break; |
644 |
} |
645 |
#endif |
646 |
#ifdef FUNCTION |
647 |
if (nextc == '(') { |
648 |
ep2 = newnode(); |
649 |
ep2->type = FUNC; |
650 |
addekid(ep2, ep1); |
651 |
ep1 = ep2; |
652 |
do { |
653 |
scan(); |
654 |
addekid(ep1, getE1()); |
655 |
} while (nextc == ','); |
656 |
if (nextc != ')') |
657 |
syntax("')' expected"); |
658 |
scan(); |
659 |
} |
660 |
#ifndef VARIABLE |
661 |
else |
662 |
syntax("'(' expected"); |
663 |
#endif |
664 |
#endif |
665 |
#ifdef RCONST |
666 |
if (isconstvar(ep1)) |
667 |
ep1 = rconst(ep1); |
668 |
#endif |
669 |
return(ep1); |
670 |
} |
671 |
#endif |
672 |
|
673 |
if (isdecimal(nextc)) { |
674 |
ep1 = newnode(); |
675 |
ep1->type = NUM; |
676 |
ep1->v.num = getnum(); |
677 |
return(ep1); |
678 |
} |
679 |
syntax("unexpected character"); |
680 |
} |
681 |
|
682 |
|
683 |
#ifdef RCONST |
684 |
EPNODE * |
685 |
rconst(epar) /* reduce a constant expression */ |
686 |
register EPNODE *epar; |
687 |
{ |
688 |
register EPNODE *ep; |
689 |
|
690 |
ep = newnode(); |
691 |
ep->type = NUM; |
692 |
errno = 0; |
693 |
ep->v.num = evalue(epar); |
694 |
if (errno) |
695 |
syntax("bad constant expression"); |
696 |
epfree(epar); |
697 |
|
698 |
return(ep); |
699 |
} |
700 |
|
701 |
|
702 |
isconstvar(ep) /* is ep linked to a constant expression? */ |
703 |
register EPNODE *ep; |
704 |
{ |
705 |
#ifdef VARIABLE |
706 |
register EPNODE *ep1; |
707 |
#ifdef FUNCTION |
708 |
|
709 |
if (ep->type == FUNC) { |
710 |
if (!isconstfun(ep->v.kid)) |
711 |
return(0); |
712 |
for (ep1 = ep->v.kid->sibling; ep1 != NULL; ep1 = ep1->sibling) |
713 |
if (ep1->type != NUM && !isconstfun(ep1)) |
714 |
return(0); |
715 |
return(1); |
716 |
} |
717 |
#endif |
718 |
if (ep->type != VAR) |
719 |
return(0); |
720 |
ep1 = ep->v.ln->def; |
721 |
if (ep1 == NULL || ep1->type != ':') |
722 |
return(0); |
723 |
#ifdef FUNCTION |
724 |
if (ep1->v.kid->type != SYM) |
725 |
return(0); |
726 |
#endif |
727 |
return(1); |
728 |
#else |
729 |
return(ep->type == FUNC); |
730 |
#endif |
731 |
} |
732 |
|
733 |
|
734 |
#if defined(FUNCTION) && defined(VARIABLE) |
735 |
isconstfun(ep) /* is ep linked to a constant function? */ |
736 |
register EPNODE *ep; |
737 |
{ |
738 |
register EPNODE *dp; |
739 |
register LIBR *lp; |
740 |
|
741 |
if (ep->type != VAR) |
742 |
return(0); |
743 |
dp = ep->v.ln->def; |
744 |
if (dp != NULL && dp->type != ':') |
745 |
return(0); |
746 |
if ((dp == NULL || dp->v.kid->type != FUNC) |
747 |
&& ((lp = liblookup(ep->v.ln->name)) == NULL |
748 |
|| lp->atyp != ':')) |
749 |
return(0); |
750 |
return(1); |
751 |
} |
752 |
#endif |
753 |
#endif |