cosmopolitan/tool/lambda/lib/parse.c
Jōshin e16a7d8f3b
flip et / noet in modelines
`et` means `expandtab`.

```sh
rg 'vi: .* :vi' -l -0 | \
  xargs -0 sed -i '' 's/vi: \(.*\) et\(.*\)  :vi/vi: \1 xoet\2:vi/'
rg 'vi: .*  :vi' -l -0 | \
  xargs -0 sed -i '' 's/vi: \(.*\)noet\(.*\):vi/vi: \1et\2  :vi/'
rg 'vi: .*  :vi' -l -0 | \
  xargs -0 sed -i '' 's/vi: \(.*\)xoet\(.*\):vi/vi: \1noet\2:vi/'
```
2023-12-07 22:17:11 -05:00

55 lines
2.6 KiB
C

/*-*- 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/lambda/lib/blc.h"
/**
* Parses binary lambda calculus closed expression from stream.
*/
struct Parse Parse(int ignored, FILE* f) {
int t, start;
char bit, need;
struct Parse p;
for (need = 0, start = end;;) {
if (end + 2 > TERMS) Error(5, "OUT OF TERMS");
if ((bit = GetBit(f)) == -1) {
if (!need) break;
fflush(stdout);
fputs("---\n", stderr);
Print(start, 0, 0, stderr);
Error(9, "UNFINISHED EXPRESSION");
} else if (bit) {
for (t = 0; NeedBit(f);) ++t;
mem[end++] = VAR;
mem[end++] = t;
break;
} else if (NeedBit(f)) {
t = end;
end += 2;
mem[t] = APP;
p = Parse(0, f);
mem[t + 1] = p.n;
need = 1;
} else {
mem[end++] = ABS;
}
}
p.i = start;
p.n = end - start;
return p;
}