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98 lines
1.7 KiB
C
98 lines
1.7 KiB
C
/* j/5/cue.c
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**
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** This file is in the public domain.
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*/
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#include "all.h"
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static u3_noun
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_cue_in(u3p(u3h_root) har_p,
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u3_atom a,
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u3_atom b)
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{
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u3_noun p, q;
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if ( 0 == u3qc_cut(0, b, 1, a) ) {
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u3_noun x = u3qa_inc(b);
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u3_noun c = u3qe_rub(x, a);
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p = u3qa_inc(u3k(u3h(c)));
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q = u3k(u3t(c));
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u3h_put(har_p, u3k(b), u3k(q));
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u3z(c);
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u3z(x);
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}
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else {
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u3_noun c = u3qa_add(2, b);
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u3_noun l = u3qa_inc(b);
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if ( 0 == u3qc_cut(0, l, 1, a) ) {
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u3_noun u, v, w;
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u3_noun x, y;
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u = _cue_in(har_p, a, c);
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x = u3qa_add(u3h(u), c);
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v = _cue_in(har_p, a, x);
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w = u3nc(u3k(u3h(u3t(u))), u3k(u3h(u3t(v))));
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y = u3qa_add(u3h(u), u3h(v));
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p = u3qa_add(2, y);
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q = w;
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u3h_put(har_p, u3k(b), u3k(q));
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u3z(u); u3z(v); u3z(x); u3z(y);
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}
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else {
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u3_noun d = u3qe_rub(c, a);
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u3_noun x = u3h_get(har_p, u3k(u3t(d)));
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p = u3qa_add(2, u3h(d));
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if ( u3_none == x ) {
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return u3m_bail(c3__exit);
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}
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q = x;
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u3z(d);
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}
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u3z(l);
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u3z(c);
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}
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return u3nt(p, q, 0);
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}
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u3_noun
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u3qe_cue(u3_atom a)
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{
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u3p(u3h_root) har_p = u3h_new();
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u3_noun x = _cue_in(har_p, a, 0);
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u3_noun y = u3k(u3h(u3t(x)));
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u3h_free(har_p);
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u3z(x);
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return y;
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}
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u3_noun
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u3we_cue(u3_noun cor)
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{
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u3_noun a;
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if ( (u3_none == (a = u3r_at(u3x_sam, cor))) ) {
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return u3m_bail(c3__fail);
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} else {
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return u3qe_cue(a);
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}
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}
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u3_noun
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u3ke_cue(u3_atom a)
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{
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u3_noun b = u3qe_cue(a);
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u3z(a);
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return b;
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}
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