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1 | !752 |
2 | |
3 | static class Var extends Lisp {
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4 | Lisp instance; |
5 | |
6 | *(S name) {
|
7 | super(name); |
8 | instance = this; |
9 | } |
10 | } |
11 | |
12 | static boolean unify(Lisp thiz, Lisp t) {
|
13 | if (thiz instanceof Var) {
|
14 | Var v = cast thiz; |
15 | if (v.instance != v) |
16 | return unify(v.instance, t); |
17 | //Trail::Push(v); |
18 | v.instance = t; |
19 | return true; |
20 | } |
21 | |
22 | return unify2(t, thiz); |
23 | } |
24 | |
25 | static boolean unify2(Lisp thiz, Lisp t) {
|
26 | if (thiz instanceof Var) |
27 | return unify(thiz, t); |
28 | |
29 | int arity = thiz.size(); |
30 | if (neq(thiz.head, t.head) || arity != t.size()) |
31 | return false; |
32 | for (int i = 0; i < arity; i++) |
33 | if (!unify(thiz.get(i), t.get(i))) |
34 | return false; |
35 | return true; |
36 | } |
37 | |
38 | p {
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39 | Var x = new Var("X");
|
40 | print(x + " = " + x.instance); |
41 | print(unify(x, lisp("hello")));
|
42 | print(x + " = " + x.instance); |
43 | } |
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| Snippet ID: | #1002818 |
| Snippet name: | Test unifiable variables |
| Eternal ID of this version: | #1002818/1 |
| Text MD5: | f8646792cfb6cfefb2c79425c88c7730 |
| Transpilation MD5: | c7c61322a624538ae32da77230fb753c |
| Author: | stefan |
| Category: | javax |
| Type: | JavaX source code |
| Public (visible to everyone): | Yes |
| Archived (hidden from active list): | No |
| Created/modified: | 2016-02-27 02:43:19 |
| Source code size: | 844 bytes / 43 lines |
| Pitched / IR pitched: | No / No |
| Views / Downloads: | 591 / 645 |
| Referenced in: | [show references] |