/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et 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 "tool/plinko/lib/plinko.h"

bool MakesClosures(int x) {
  int h;
  if (x < 0 && (h = Car(x)) != kQuote && h != kClosure) {
    if (h == kMacro)
      return true;
    if (h == kLambda)
      return true;
    if (h == kCond) {
      while ((x = Cdr(x)) < 0) {
        if ((h = Car(x)) < 0) {
          if (MakesClosures(Car(h)))
            return true;
          if ((h = Cdr(h)) < 0) {
            if (MakesClosures(Car(h)))
              return true;
          }
        }
      }
    } else {
      while (x) {
        if (x < 0) {
          h = Car(x);
          x = Cdr(x);
        } else {
          h = x;
          x = 0;
        }
        MakesClosures(h);
      }
    }
  }
  return false;
}