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- /* SC A Spreadsheet Calculator
- * Expression interpreter and assorted support routines.
- *
- * original by James Gosling, September 1982
- * modified by Mark Weiser and Bruce Israel,
- * University of Maryland
- *
- * More mods Robert Bond, 12/86
- * Major mods to run on VMS and AMIGA, 1/17/87
- * OS/2 Modifications by Brady Flowers, 7/19/90
- */
-
- #include "sc.h"
- #define DEFCOLDELIM ':'
-
- #ifdef OS2
- #include <stdlib.h>
- #include <string.h>
- #else
- char *malloc();
- #endif
-
-
- double dosum(minr, minc, maxr, maxc)
- int minr, minc, maxr, maxc;
- {
- double v;
- register r,c;
- register struct ent *p;
-
- v = 0.0;
- for (r = minr; r<=maxr; r++)
- for (c = minc; c<=maxc; c++)
- if ((p = tbl[r][c]) && p->flags&is_valid)
- v += p->v;
- return v;
- }
-
- double doprod(minr, minc, maxr, maxc)
- int minr, minc, maxr, maxc;
- {
- double v;
- register r,c;
- register struct ent *p;
-
- v = 1.0;
- for (r = minr; r<=maxr; r++)
- for (c = minc; c<=maxc; c++)
- if ((p = tbl[r][c]) && p->flags&is_valid)
- v *= p->v;
- return v;
- }
-
- double doavg(minr, minc, maxr, maxc)
- int minr, minc, maxr, maxc;
- {
- double v;
- register r,c,count;
- register struct ent *p;
-
- v = 0.0;
- count = 0;
- for (r = minr; r<=maxr; r++)
- for (c = minc; c<=maxc; c++)
- if ((p = tbl[r][c]) && p->flags&is_valid) {
- v += p->v;
- count++;
- }
-
- return (v / (double)count);
- }
-
- double eval(e)
- register struct enode *e; {
- if (!e) return 0.0;
- switch (e->op) {
- case '+': return (eval(e->e.o.left) + eval(e->e.o.right));
- case '-': return (eval(e->e.o.left) - eval(e->e.o.right));
- case '*': return (eval(e->e.o.left) * eval(e->e.o.right));
- case '/': { double denom = eval (e->e.o.right);
- return denom ? eval(e->e.o.left) / denom : 0.0; }
- case '<': return (double)(eval(e->e.o.left) < eval(e->e.o.right));
- case '=': return (double)(eval(e->e.o.left) == eval(e->e.o.right));
- case '>': return (double)(eval(e->e.o.left) > eval(e->e.o.right));
- case '&': return (eval(e->e.o.left) != 0.0 &&
- eval(e->e.o.right) != 0.0) ? 1.0 : 0.0;
- case '|': return (eval(e->e.o.left) != 0.0 ||
- eval(e->e.o.right) != 0.0) ? 1.0 : 0.0;
- case '?': return eval(e->e.o.left) ? eval(e->e.o.right->e.o.left)
- : eval(e->e.o.right->e.o.right);
- case 'm': return (-eval(e->e.o.right));
- case 'f': return (eval(e->e.o.right));
- case '~': return (double)(!eval(e->e.o.right));
- case 'k': return (e->e.k);
- case 'v': return (e->e.v->v);
- case O_REDUCE('+'):
- case O_REDUCE('*'):
- case O_REDUCE('a'):
- { register r,c;
- register maxr, maxc;
- register minr, minc;
- maxr = ((struct ent *) e->e.o.right) -> row;
- maxc = ((struct ent *) e->e.o.right) -> col;
- minr = ((struct ent *) e->e.o.left) -> row;
- minc = ((struct ent *) e->e.o.left) -> col;
- if (minr>maxr) r = maxr, maxr = minr, minr = r;
- if (minc>maxc) c = maxc, maxc = minc, minc = c;
- switch (e->op) {
- case O_REDUCE('+'): return dosum(minr, minc, maxr, maxc);
- case O_REDUCE('*'): return doprod(minr, minc, maxr, maxc);
- case O_REDUCE('a'): return doavg(minr, minc, maxr, maxc);
- }
- }
- }
- }
-
- #define MAXPROP 7
-
- VOID EvalAll () {
- int lastct,repct = 0;
-
- while ((lastct = RealEvalAll()) && (repct++ <= MAXPROP));
-
- repct--;
- }
-
- int RealEvalAll () {
- register i,j;
- int chgct = 0;
- register struct ent *p;
- for (i=0; i<=maxrow; i++)
- for (j=0; j<=maxcol; j++)
- if ((p=tbl[i][j]) && p->expr) {
- double v = eval (p->expr);
- if (v != p->v) {
- p->v = v; chgct++;
- p->flags |= (is_changed|is_valid);
- }
- }
- return(chgct);
- }
-
- struct enode *new(op,a1,a2)
- struct enode *a1, *a2;
- {
- register struct enode *p = (struct enode *) malloc (sizeof (struct enode));
- p->op = op;
- switch (op) {
- case O_VAR: p->e.v = (struct ent *) a1; break;
- case O_CONST: p->e.k = *(double *)&a1; break;
- default: p->e.o.left = a1; p->e.o.right = a2;
- }
- return p;
- }
-
- VOID copy (dv, v1, v2)
- struct ent *dv, *v1, *v2;
- {
- register r,c;
- register struct ent *p;
- register struct ent *n;
- register deltar, deltac;
- int maxr, maxc;
- int minr, minc;
- int dr, dc;
-
- dr = dv->row;
- dc = dv->col;
- maxr = v2->row;
- maxc = v2->col;
- minr = v1->row;
- minc = v1->col;
- if (minr>maxr) r = maxr, maxr = minr, minr = r;
- if (minc>maxc) c = maxc, maxc = minc, minc = c;
- if (dr+maxr-minr >= MAXROWS ||
- dc+maxc-minc >= MAXCOLS) {
- error ("The table can't be any bigger");
- return;
- }
- deltar = dr-minr;
- deltac = dc-minc;
- FullUpdate++;
- for (r = minr; r<=maxr; r++)
- for (c = minc; c<=maxc; c++) {
- n = lookat (r+deltar, c+deltac);
- clearent(n);
- if (p = tbl[r][c]) {
- n -> v = p -> v;
- n -> flags = p -> flags;
- n -> expr = copye(p->expr, deltar, deltac);
- n -> label = 0;
- if (p -> label) {
- n -> label = (char *)
- malloc (strlen (p -> label) + 1);
- strcpy (n -> label, p -> label);
- }
- }
- }
- }
-
- VOID let (v, e)
- struct ent *v;
- struct enode *e; {
- efree (v->expr);
- if (constant(e)) {
- v->v = eval(e);
- v->expr = 0;
- efree(e);
- } else
- v->expr = e;
- v->flags |= (is_changed|is_valid);
- changed++;
- modflg++;
- }
-
- VOID clearent (v)
- struct ent *v; {
- if (!v)
- return;
- label(v,"",-1);
- v->v = 0.0;
- if (v->expr)
- efree(v->expr);
- v->expr = 0;
- v->flags |= (is_changed);
- v->flags &= ~(is_valid);
- changed++;
- modflg++;
- }
-
- int constant(e)
- register struct enode *e; {
- return e==0 || e->op == O_CONST
- || (e->op != O_VAR
- && (e->op&~0177) != O_REDUCE(0)
- && constant (e->e.o.left)
- && constant(e->e.o.right));
- }
-
- VOID efree (e)
- register struct enode *e; {
- if (e) {
- if (e->op != O_VAR && e->op !=O_CONST && (e->op&~0177) != O_REDUCE(0)) {
- efree (e->e.o.left);
- efree (e->e.o.right);
- }
- free (e);
- }
- }
-
- VOID label (v, s, flushdir)
- register struct ent *v;
- register char *s; {
- if (v) {
- if (flushdir==0 && v->flags&is_valid) {
- register struct ent *tv;
- if (v->col>0 && ((tv=lookat(v->row,v->col-1))->flags&is_valid)==0)
- v = tv, flushdir = 1;
- else if (((tv=lookat (v->row,v->col+1))->flags&is_valid)==0)
- v = tv, flushdir = -1;
- else flushdir = -1;
- }
- if (v->label) free(v->label);
- if (s && s[0]) {
- v->label = (char *) malloc (strlen(s)+1);
- strcpy (v->label, s);
- } else v->label = 0;
- v->flags |= is_lchanged;
- if (flushdir<0) v->flags |= is_leftflush;
- else v->flags &= ~is_leftflush;
- FullUpdate++;
- modflg++;
- }
- }
-
- VOID decodev (v)
- register struct ent *v; {
- if (v) sprintf (line+linelim, "%s%d", coltoa(v->col), v->row);
- else sprintf (line+linelim,"VAR?");
- linelim += strlen (line+linelim);
- }
-
- char *
- coltoa(col)
- int col;
- {
- static char rname[3];
- register char *p = rname;
-
- if (col < 0 || col > 25*26)
- debug("coltoa: invalid col: %d", col);
-
- if (col > 25) {
- *p++ = (char)(col/26 + 'A' - 1);
- col %= 26;
- }
- *p++ = (char)(col+'A');
- *p = 0;
- return(rname);
- }
-
- VOID decompile(e, priority)
- register struct enode *e; {
- register char *s;
- if (e) {
- int mypriority;
- switch (e->op) {
- default: mypriority = 99; break;
- case '?': mypriority = 1; break;
- case ':': mypriority = 2; break;
- case '|': mypriority = 3; break;
- case '&': mypriority = 4; break;
- case '<': case '=': case '>': mypriority = 6; break;
- case '+': case '-': mypriority = 8; break;
- case '*': case '/': mypriority = 10; break;
- }
- if (mypriority<priority) line[linelim++] = '(';
- switch (e->op) {
- case 'f': {
- for (s="fixed "; line[linelim++] = *s++;);
- linelim--;
- decompile (e->e.o.right, 30);
- break;
- }
- case 'm': line[linelim++] = '-';
- decompile (e->e.o.right, 30);
- break;
- case '~': line[linelim++] = '~';
- decompile (e->e.o.right, 30);
- break;
- case 'v': decodev (e->e.v);
- break;
- case 'k': sprintf (line+linelim,"%.8g",e->e.k);
- linelim += strlen (line+linelim);
- break;
- case O_REDUCE('+'):
- for (s="@sum("; line[linelim++] = *s++;);
- goto more;
- case O_REDUCE('*'):
- for (s="@prod("; line[linelim++] = *s++;);
- goto more;
- case O_REDUCE('a'):
- for (s="@avg("; line[linelim++] = *s++;);
- more: linelim--;
- decodev ((struct ent *)(e->e.o.left));
- line[linelim++] = ':';
- decodev ((struct ent *)(e->e.o.right));
- line[linelim++] = ')';
- break;
-
- default: decompile (e->e.o.left, mypriority);
- line[linelim++] = (char)(e->op);
- decompile (e->e.o.right, mypriority+1);
- break;
- }
- if (mypriority<priority) line[linelim++] = ')';
- } else line[linelim++] = '?';
- }
-
- VOID editv (row, col) {
- sprintf (line, "let %s%d = ", coltoa(col), row);
- linelim = strlen(line);
- editexp(row,col);
- }
-
- VOID editexp(row,col) {
- register struct ent *p;
- p = lookat (row, col);
- if (p->flags&is_valid)
- if (p->expr) {
- decompile (p->expr, 30);
- line[linelim] = 0;
- } else {
- sprintf (line+linelim, "%.8g", p->v);
- linelim += strlen (line+linelim);
- }
- }
-
- VOID edits (row, col) {
- register struct ent *p = lookat (row, col);
- sprintf (line, "%sstring %s%d = \"",
- ((p->flags&is_leftflush) ? "left" : "right"),
- coltoa(col), row);
- linelim = strlen(line);
- sprintf (line+linelim, "%s", p->label);
- linelim += strlen (line+linelim);
- }
-
- VOID printfile (fname)
- char *fname;
- {
- FILE *f = fopen(fname, "w");
- char pline[1000];
- int plinelim;
- register row, col;
- register struct ent **p;
- if (f==0) {
- error ("Can't create %s", fname);
- return;
- }
- for (row=0;row<=maxrow; row++) {
- register c = 0;
- plinelim = 0;
- for (p = &tbl[row][col=0]; col<=maxcol; col++, p++) {
- if (*p) {
- char *s;
- while (plinelim<c) pline[plinelim++] = ' ';
- plinelim = c;
- if ((*p)->flags&is_valid) {
- sprintf (pline+plinelim,"%*.*f",fwidth[col],precision[col],
- (*p)->v);
- plinelim += strlen (pline+plinelim);
- }
- if (s = (*p)->label) {
- register char *d;
- d = pline+((*p)->flags&is_leftflush
- ? c : c-strlen(s)+fwidth[col]);
- while (d>pline+plinelim) pline[plinelim++] = ' ';
- if (d<pline) d = pline;
- while (*s) *d++ = *s++;
- if (d-pline>plinelim) plinelim = d-pline;
- }
- }
- c += fwidth [col];
- }
- fprintf (f,"%.*s\n",plinelim,pline);
- }
- fclose (f);
- }
-
- VOID tblprintfile (fname)
- char *fname;
- {
- FILE *f = fopen(fname, "w");
- char pline[1000];
- int plinelim;
- register row, col;
- register struct ent **p;
- char coldelim = DEFCOLDELIM;
-
- if (f==0) {
- error ("Can't create %s", fname);
- return;
- }
- for (row=0;row<=maxrow; row++) {
- register c = 0;
- plinelim = 0;
- for (p = &tbl[row][col=0]; col<=maxcol; col++, p++) {
- if (*p) {
- char *s;
- if ((*p)->flags&is_valid) {
- fprintf (f,"%.*f",precision[col],
- (*p)->v);
- }
- if (s = (*p)->label) {
- fprintf (f,"%s",s);
- }
- }
- fprintf(f,"%c",coldelim);
- }
- fprintf (f,"\n",pline);
- }
- fclose (f);
- }
-
- struct enode *copye (e, Rdelta, Cdelta)
- register struct enode *e; {
- register struct enode *ret;
- if (e==0) ret = 0;
- else {
- ret = (struct enode *) malloc (sizeof (struct enode));
- ret->op = e->op;
- switch (ret->op) {
- case 'v':
- ret->e.v = lookat (e->e.v->row+Rdelta, e->e.v->col+Cdelta);
- break;
- case 'k':
- ret->e.k = e->e.k;
- break;
- case 'f':
- ret->e.o.right = copye (e->e.o.right,0,0);
- ret->e.o.left = 0;
- break;
- case O_REDUCE('+'):
- case O_REDUCE('*'):
- case O_REDUCE('a'):
- ret->e.o.right = (struct enode *) lookat (
- ((struct ent *)e->e.o.right)->row+Rdelta,
- ((struct ent *)e->e.o.right)->col+Cdelta
- );
- ret->e.o.left = (struct enode *) lookat (
- ((struct ent *)e->e.o.left)->row+Rdelta,
- ((struct ent *)e->e.o.left)->col+Cdelta
- );
- break;
- default:
- ret->e.o.right = copye (e->e.o.right,Rdelta,Cdelta);
- ret->e.o.left = copye (e->e.o.left,Rdelta,Cdelta);
- break;
- }
- }
- return ret;
- }
-
- /*
- * sync_refs and sync_ref are used to remove references to
- * deleted struct ents. Note that the deleted structure must still
- * be hanging around before the call, but not referenced by an entry
- * in tbl. Thus the free_ent, fix_ent calls in sc.c
- */
-
- VOID sync_refs () {
- register i,j;
- register struct ent *p;
- for (i=0; i<=maxrow; i++)
- for (j=0; j<=maxcol; j++)
- if ((p=tbl[i][j]) && p->expr)
- sync_ref(p->expr);
- }
-
-
- VOID sync_ref(e)
- register struct enode *e;
- {
- if (e==0)
- return;
- else {
- switch (e->op) {
- case 'v':
- e->e.v = lookat(e->e.v->row, e->e.v->col);
- break;
- case 'k':
- break;
- case O_REDUCE('+'):
- case O_REDUCE('*'):
- case O_REDUCE('a'):
- e->e.o.right = (struct enode *) lookat (
- ((struct ent *)e->e.o.right)->row,
- ((struct ent *)e->e.o.right)->col
- );
- e->e.o.left = (struct enode *) lookat (
- ((struct ent *)e->e.o.left)->row,
- ((struct ent *)e->e.o.left)->col
- );
- break;
- default:
- sync_ref(e->e.o.right);
- sync_ref(e->e.o.left);
- break;
- }
- }
- }
-
- VOID hiderow(arg)
- {
- register int r1;
- register int r2;
-
- r1 = currow;
- r2 = r1 + arg - 1;
- if (r1 < 0 || r1 > r2) {
- error("Invalid Range");
- return;
- }
- if (r2 > MAXROWS-2) {
- error("You can't hide the last row");
- return;
- }
- FullUpdate++;
- while (r1 <= r2)
- hidden_row[r1++] = 1;
- }
-
- VOID hidecol(arg)
- {
- register int c1;
- register int c2;
-
- c1 = curcol;
- c2 = c1 + arg - 1;
- if (c1 < 0 || c1 > c2) {
- error("Invalid Range");
- return;
- }
- if (c2 > MAXCOLS-2) {
- error("You can't hide the last col");
- return;
- }
- FullUpdate++;
- while (c1 <= c2)
- hidden_col[c1++] = 1;
- }
-
- VOID showrow(r1, r2)
- {
- if (r1 < 0 || r1 > r2) {
- error("Invalid Range");
- return;
- }
- if (r2 > MAXROWS-1) {
- r2 = MAXROWS-1;
- }
- FullUpdate++;
- while (r1 <= r2)
- hidden_row[r1++] = 0;
- }
-
- VOID showcol(c1, c2)
- {
- if (c1 < 0 || c1 > c2) {
- error("Invalid Range");
- return;
- }
- if (c2 > MAXCOLS-1) {
- c2 = MAXCOLS-1;
- }
- FullUpdate++;
- while (c1 <= c2)
- hidden_col[c1++] = 0;
- }
-