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u3: rewrites +skip jet with u3i_defcons()

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This commit is contained in:
Joe Bryan 2020-10-09 16:13:12 -07:00
parent fda817dc61
commit 6010f2a866
1 changed files with 38 additions and 40 deletions
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78
pkg/urbit/jets/b/skip.c
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@ -3,50 +3,48 @@
*/
#include "all.h"
static u3_noun
_skip_in(u3j_site* sit_u, u3_noun a)
{
if ( 0 == a ) {
return a;
}
else if ( c3n == u3du(a) ) {
return u3_none;
} else {
u3_noun hoz = u3j_gate_slam(sit_u, u3k(u3h(a)));
u3_noun vyr = _skip_in(sit_u, u3t(a));
u3_noun
u3qb_skip(u3_noun a, u3_noun b)
{
u3_noun pro;
u3_noun* lit = &pro;
switch ( hoz ) {
case c3y: return vyr;
case c3n: return u3nc(u3k(u3h(a)), vyr);
default: u3z(hoz);
u3z(vyr);
return u3_none;
if ( u3_nul != a) {
u3_noun i, t = a;
u3_noun* hed;
u3_noun* tel;
u3j_site sit_u;
u3j_gate_prep(&sit_u, u3k(b));
do {
u3x_cell(t, &i, &t);
switch ( u3j_gate_slam(&sit_u, u3k(i)) ) {
case c3y: break;
case c3n: {
*lit = u3i_defcons(&hed, &tel);
*hed = u3k(i);
lit = tel;
} break;
default: u3m_bail(c3__exit);
}
}
}
while ( u3_nul != t );
/* functions
*/
u3_noun
u3qb_skip(u3_noun a,
u3_noun b)
{
u3j_site sit_u;
u3_noun pro;
u3j_gate_prep(&sit_u, u3k(b));
pro = _skip_in(&sit_u, a);
u3j_gate_lose(&sit_u);
return pro;
}
u3_noun
u3wb_skip(u3_noun cor)
{
u3_noun a, b;
if ( c3n == u3r_mean(cor, u3x_sam_2, &a, u3x_sam_3, &b, 0) ) {
return u3_none;
} else {
return u3qb_skip(a, b);
}
}
*lit = u3_nul;
return pro;
}
u3_noun
u3wb_skip(u3_noun cor)
{
u3_noun a, b;
u3x_mean(cor, u3x_sam_2, &a, u3x_sam_3, &b, 0);
return u3qb_skip(a, b);
}