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/************************************************************************
* This program is Copyright (C) 1986-1996 by Jonathan Payne. JOVE is *
* provided to you without charge, and with no warranty. You may give *
* away copies of JOVE, including sources, provided that this notice is *
* included in all the files. *
************************************************************************/
#include "jove.h"
#include "jctype.h"
int arg_state = AS_NONE,
arg_count;
void
negate_arg()
{
if (arg_count < 0) {
arg_count = -arg_count;
if (arg_count < 0)
complain("arg count overflow");
} else {
arg_count = -arg_count;
}
}
private void
gather_argument(ns, nc)
int
ns, /* new state */
nc; /* new count */
{
for (;;) {
ZXchar c;
bool neg = NO;
if (arg_count < 0) {
neg = YES;
negate_arg();
}
if (ns != arg_state) {
/* First time in this state */
arg_state = ns;
arg_count = nc; /* ignore previous value (but remember sign) */
} else {
/* Continuing in this state. */
int t = arg_count;
switch (ns) {
case AS_NUMERIC:
t = t*10 + nc; /* add a digit to previous value */
break;
case AS_NEGSIGN:
neg = !neg; /* change previous sign */
break;
case AS_TIMES:
t *= nc; /* multiply by factor */
break;
}
if (t < arg_count)
complain("arg count overflow");
arg_count = t;
}
if (neg)
negate_arg();
/* Treat a following digit as AS_NUMERIC.
* If in AS_TIMES, accept a '-'.
*/
c = waitchar();
if (jisdigit(c)) {
ns = AS_NUMERIC;
nc = c - '0';
} else if (arg_state==AS_TIMES && c=='-') {
ns = AS_NEGSIGN; /* forget multiplication */
nc = -1;
} else {
Ungetc(c);
break;
}
}
this_cmd = ARG_CMD;
}
void
TimesFour()
{
gather_argument(AS_TIMES, 4);
}
void
Digit()
{
if (LastKeyStruck == '-')
gather_argument(AS_NEGSIGN, -1);
else if (jisdigit(LastKeyStruck))
gather_argument(AS_NUMERIC, LastKeyStruck - '0');
else
complain((char *)NULL);
}
void
Digit0()
{
gather_argument(AS_NUMERIC, 0);
}
void
Digit1()
{
gather_argument(AS_NUMERIC, 1);
}
void
Digit2()
{
gather_argument(AS_NUMERIC, 2);
}
void
Digit3()
{
gather_argument(AS_NUMERIC, 3);
}
void
Digit4()
{
gather_argument(AS_NUMERIC, 4);
}
void
Digit5()
{
gather_argument(AS_NUMERIC, 5);
}
void
Digit6()
{
gather_argument(AS_NUMERIC, 6);
}
void
Digit7()
{
gather_argument(AS_NUMERIC, 7);
}
void
Digit8()
{
gather_argument(AS_NUMERIC, 8);
}
void
Digit9()
{
gather_argument(AS_NUMERIC, 9);
}
void
DigitMinus()
{
gather_argument(AS_NEGSIGN, -1);
}
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