urbit/jets/e/jam.c
2018-01-24 13:16:44 -08:00

177 lines
3.3 KiB
C

/* j/5/jam.c
**
*/
#include "all.h"
/* functions
*/
static u3_noun
_jam_pair(u3_noun x, u3_noun d, u3_noun e)
{
u3_noun r, p_d, q_d, r_d;
u3x_trel(d, &p_d, &q_d, &r_d);
{
u3_noun y = u3qa_add(x, p_d);
u3_noun p_e, q_e, r_e;
u3x_trel(e, &p_e, &q_e, &r_e);
{
u3_noun z = u3qa_add(p_d, p_e);
r = u3nt(u3qa_add(2, z), u3k(q_e), 0);
u3z(z);
}
u3z(y);
}
u3z(x);
u3z(d);
u3z(e);
return r;
}
static u3_noun
_jam_flat(u3_atom a, u3_noun l)
{
u3_noun d = u3qe_mat(a);
u3_noun x = u3qa_add(1, u3h(d));
u3_noun y = u3nt
(u3k(x), u3nc(u3nc(x, u3qc_lsh(0, 1, u3t(d))), u3k(l)), 0);
u3z(d);
return y;
}
static u3_noun
_jam_ptr(u3_atom u_c, u3_noun l)
{
u3_noun d = u3qe_mat(u_c);
u3_atom x = u3qc_lsh(0, 2, u3t(d));
u3_atom y = u3qa_add(2, u3h(d));
u3_noun z = u3nt
(u3k(y), u3nc(u3nc(y, u3qc_mix(3, x)), u3k(l)), 0);
u3z(d);
u3z(x);
return z;
}
typedef struct {
u3_noun a;
u3_noun b;
u3_noun l;
u3_noun* r;
u3_noun hed;
u3_noun tel;
} jamframe;
static inline void
_jam_push(u3_noun a, u3_noun b, u3_noun l, u3_noun *r)
{
jamframe* fam = u3a_push(sizeof(jamframe));
fam->a = a;
fam->b = b;
fam->l = l;
fam->r = r;
fam->hed = u3_none;
fam->tel = u3_none;
}
static inline void
_jam_pop()
{
u3a_pop(sizeof(jamframe));
}
static inline jamframe*
_jam_peek()
{
return (jamframe*) u3a_peek(sizeof(jamframe));
}
u3_noun
u3qe_jam(u3_atom a)
{
u3p(u3h_root) har_p = u3h_new();
u3p(jamframe) empty = u3R->cap_p;
jamframe* fam;
u3_noun out, c, x, q, r;
_jam_push(a, 0, u3_nul, &out);
while ( empty != u3R->cap_p ) {
fam = _jam_peek();
if ( u3_none != fam->tel ) {
u3_noun z = u3qa_add(2, fam->b);
x = _jam_pair(z, fam->hed, fam->tel);
}
else if ( u3_none != fam->hed ) {
u3_noun p_d, q_d, r_d;
u3x_trel(fam->hed, &p_d, &q_d, &r_d);
{
u3_noun z = u3qa_add(2, fam->b);
u3_noun y = u3qa_add(z, p_d);
_jam_push(u3t(fam->a), y, q_d, &(fam->tel));
u3z(z);
continue;
}
}
else {
a = fam->a;
c = u3h_get(har_p, a);
if ( u3_none != c ) {
if ( (c3y == u3ud(a)) && u3r_met(0, a) <= u3r_met(0, c) ) {
x = _jam_flat(a, fam->l);
}
else {
x = _jam_ptr(c, fam->l);
}
}
else {
u3h_put(har_p, a, u3k(fam->b));
if ( c3y == u3ud(a) ) {
x = _jam_flat(a, fam->l);
}
else {
u3_noun z = u3qa_add(2, fam->b);
u3_noun w = u3nc(u3nc(2, 1), u3k(fam->l));
_jam_push(u3h(a), z, w, &(fam->hed));
continue;
}
}
}
*(fam->r) = x;
u3z(fam->b);
_jam_pop();
}
q = u3qb_flop(u3h(u3t(out)));
r = u3qc_can(0, q);
u3z(out);
u3z(q);
u3h_free(har_p);
return r;
}
u3_noun
u3we_jam(u3_noun cor)
{
u3_noun a;
if ( (u3_none == (a = u3r_at(u3x_sam, cor))) ) {
return u3m_bail(c3__fail);
} else {
return u3qe_jam(a);
}
}
u3_atom
u3ke_jam(u3_noun a)
{
u3_atom b = u3qe_jam(a);
u3z(a);
return b;
}