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