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106 lines
2.3 KiB
C
106 lines
2.3 KiB
C
/* j/4/in_del.c
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**
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*/
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#include "all.h"
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/* functions
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*/
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static u3_noun
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_rebalance(u3_noun a)
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{
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u3_noun l_a, n_a, r_a;
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if ( c3n == u3r_trel(a, &n_a, &l_a, &r_a) ) {
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return u3m_bail(c3__exit);
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}
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else {
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if ( u3_nul == l_a) {
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return u3k(r_a);
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}
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else if ( u3_nul == r_a) {
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return u3k(l_a);
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}
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else {
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u3_noun n_l_a, l_l_a, r_l_a;
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u3_noun n_r_a, l_r_a, r_r_a;
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if ( (c3n == u3r_trel(l_a, &n_l_a, &l_l_a, &r_l_a) ) ||
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(c3n == u3r_trel(r_a, &n_r_a, &l_r_a, &r_r_a) ) ) {
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return u3m_bail(c3__exit);
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}
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else {
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if ( c3y == u3qc_mor(n_l_a, n_r_a) ) {
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u3_noun new_right = u3nt(u3k(n_a),
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u3k(r_l_a),
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u3k(r_a));
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u3_noun ret = u3nt(u3k(n_l_a),
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u3k(l_l_a),
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_rebalance(new_right));
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u3z(new_right);
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return ret;
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}
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else {
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u3_noun new_left = u3nt(u3k(n_a),
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u3k(l_a),
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u3k(l_r_a));
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u3_noun ret = u3nt(u3k(n_r_a),
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_rebalance(new_left),
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u3k(r_r_a));
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u3z(new_left);
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return ret;
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}
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}
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}
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}
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}
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u3_noun
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u3qdi_del(u3_noun a,
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u3_noun b)
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{
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if ( u3_nul == a ) {
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return u3_nul;
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}
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else {
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u3_noun l_a, n_a, r_a;
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if ( (c3n == u3r_trel(a, &n_a, &l_a, &r_a)) ) {
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return u3m_bail(c3__exit);
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}
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else if ( c3n == u3r_sing(n_a, b) ) {
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if ( c3y == u3qc_gor(b, n_a) ) {
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return u3nt(u3k(n_a),
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u3qdi_del(l_a, b),
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u3k(r_a));
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}
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else {
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return u3nt(u3k(n_a),
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u3k(l_a),
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u3qdi_del(r_a, b));
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}
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}
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else {
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return _rebalance(a);
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}
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}
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}
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u3_noun
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u3wdi_del(u3_noun cor)
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{
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u3_noun a, b;
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if ( c3n == u3r_mean(cor, u3x_sam, &b,
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u3x_con_sam, &a, 0) ) {
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return u3m_bail(c3__exit);
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}
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else {
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u3_noun n = u3qdi_del(a, b);
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return n;
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}
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}
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