mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-12 17:27:56 +00:00
80 lines
3.1 KiB
C
80 lines
3.1 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
|
|
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
│ Copyright 2022 Justine Alexandra Roberts Tunney │
|
|
│ │
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
|
│ │
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
#include "libc/log/check.h"
|
|
#include "tool/plinko/lib/config.h"
|
|
#include "tool/plinko/lib/cons.h"
|
|
#include "tool/plinko/lib/gc.h"
|
|
#include "tool/plinko/lib/index.h"
|
|
#include "tool/plinko/lib/plinko.h"
|
|
#include "tool/plinko/lib/trace.h"
|
|
|
|
int Exlis(int x, int a) {
|
|
int y;
|
|
if (!x) return x;
|
|
if (x > 0) return expand(x, a);
|
|
y = expand(Car(x), a);
|
|
return Keep(x, Cons(y, Exlis(Cdr(x), a)));
|
|
}
|
|
|
|
static int Expander(int e, int a) {
|
|
int f, u, x, y, s;
|
|
for (s = 0;;) {
|
|
DCHECK_LT(e, TERM);
|
|
DCHECK_LE(a, 0);
|
|
if (e >= 0) return e;
|
|
if ((f = Car(e)) > 0) {
|
|
if (f == kQuote) return e;
|
|
if (f == kClosure) return e;
|
|
if (f == kTrace) {
|
|
START_TRACE;
|
|
x = Cadr(e);
|
|
y = expand(x, a);
|
|
e = x == y ? e : List(Car(e), y);
|
|
END_TRACE;
|
|
return e;
|
|
}
|
|
if (HasAtom(f, s)) return e;
|
|
s = Cons(f, s);
|
|
}
|
|
e = Exlis(e, a);
|
|
if (f >= 0) {
|
|
if (!(f = Assoc(f, a))) return e;
|
|
f = Cdr(f);
|
|
if (f >= 0) return e;
|
|
}
|
|
if (Car(f) == kClosure) {
|
|
u = Cddr(f);
|
|
f = Cadr(f);
|
|
} else {
|
|
u = a;
|
|
}
|
|
if (Head(f) != kMacro) return e;
|
|
e = eval(Caddr(f), pairlis(Cadr(f), Cdr(e), u));
|
|
}
|
|
}
|
|
|
|
int Expand(int e, int a) {
|
|
int r, A;
|
|
A = cx;
|
|
Push(List(kExpand, e));
|
|
r = Keep(e, Expander(e, a));
|
|
Pop();
|
|
r = MarkSweep(A, r);
|
|
return r;
|
|
}
|