1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
|
// Copyright (c) 2024, Marvin Borner <dev@marvinborner.de>
// SPDX-License-Identifier: MIT
#include <stdlib.h>
#include <stdio.h>
#include <term.h>
#include <log.h>
#include <print.h>
Term *term_new(TermType type)
{
struct term *term = malloc(sizeof(*term));
if (!term)
fatal("out of memory!\n");
term->type = type;
return term;
}
void term_free(Term *term)
{
switch (term->type) {
case ABS:
term_free(term->u.abs.body);
free(term);
break;
case APP:
term_free(term->u.app.lhs);
term_free(term->u.app.rhs);
free(term);
break;
case IDX:
free(term);
break;
default:
fatal("invalid type %d\n", term->type);
}
}
void term_diff(Term *a, Term *b)
{
if (a->type != b->type) {
fprintf(stderr, "Term a: ");
print_bruijn(a);
fprintf(stderr, "\nTerm b: ");
print_bruijn(b);
fprintf(stderr, "\n");
fatal("type mismatch %d %d\n", a->type, b->type);
}
switch (a->type) {
case ABS:
term_diff(a->u.abs.body, b->u.abs.body);
break;
case APP:
term_diff(a->u.app.lhs, b->u.app.lhs);
term_diff(a->u.app.rhs, b->u.app.rhs);
break;
case IDX:
if (a->u.index != b->u.index)
fatal("var mismatch %d=%d\n", a->u.index, b->u.index);
break;
default:
fatal("invalid type %d\n", a->type);
}
}
|
