mirror of
https://github.com/urbit/shrub.git
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216 lines
4.9 KiB
C
216 lines
4.9 KiB
C
/* j/6/fuse.c
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**
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*/
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#include "all.h"
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/* logic
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*/
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static u3_noun
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_fuse_in(u3_noun, u3_noun, u3_noun, u3_noun);
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static u3_noun
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_fuse_repo(u3_noun van,
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u3_noun sut,
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u3_noun ref,
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u3_noun bix)
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{
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u3_noun rep = u3qfu_repo(van, sut);
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u3_noun ret = _fuse_in(van, rep, ref, bix);
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if ( c3y == u3r_sing(ret, rep) ) {
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if ( c3__void == rep ) {
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return c3__void;
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} else {
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u3z(rep);
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u3z(ret);
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return u3k(sut);
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}
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} else {
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u3z(rep);
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return ret;
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}
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}
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static u3_noun
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_fuse_in_fork(u3_noun van, u3_noun p_sut, u3_noun ref, u3_noun bix)
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{
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if ( u3_nul == p_sut ) {
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return u3_nul;
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}
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else {
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return u3nc(_fuse_in(van, u3h(p_sut), ref, bix),
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_fuse_in_fork(van, u3t(p_sut), ref, bix));
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}
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}
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static u3_noun
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_fuse_in(u3_noun van,
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u3_noun sut,
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u3_noun ref,
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u3_noun bix)
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{
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u3_noun p_sut, q_sut;
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if ( c3y == u3r_sing(sut, ref) || (c3__noun == ref) ) {
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return u3k(sut);
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}
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if ( c3n == u3du(sut) ) switch ( sut ) {
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default: return u3m_bail(c3__fail);
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case c3__noun:
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{
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return u3k(ref);
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}
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case c3__void:
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{
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return c3__void;
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}
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}
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else switch ( u3h(sut) ) {
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default: return u3m_bail(c3__fail);
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case c3__atom: u3x_cell(u3t(sut), &p_sut, &q_sut);
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{
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if ( c3y == u3du(ref) ) {
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if ( c3__atom == u3h(ref) ) {
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u3_noun p_ref, q_ref;
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u3x_cell(u3t(ref), &p_ref, &q_ref);
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{
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u3_noun foc = (c3y == u3qf_fitz(p_ref, p_sut))
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? u3k(p_sut)
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: u3k(p_ref);
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if ( c3y == u3du(q_sut) ) {
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if ( c3y == u3du(q_ref) ) {
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if ( c3y == u3r_sing(q_ref, q_sut) ) {
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return u3nt(c3__atom, foc, u3k(q_sut));
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}
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else {
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u3z(foc);
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return c3__void;
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}
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}
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else {
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return u3nt(c3__atom, foc, u3k(q_sut));
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}
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} else {
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return u3nt(c3__atom, foc, u3k(q_ref));
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}
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}
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}
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else if ( c3__cell == u3h(ref) ) {
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return c3__void;
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}
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}
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return _fuse_in(van, ref, sut, bix);
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}
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case c3__cell: u3x_cell(u3t(sut), &p_sut, &q_sut);
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{
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u3_noun p_ref, q_ref;
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if ( c3y == u3r_pq(ref, c3__cell, &p_ref, &q_ref) ) {
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u3_noun hed = _fuse_in(van, p_sut, p_ref, bix);
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u3_noun tal = _fuse_in(van, q_sut, q_ref, bix);
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u3_noun ret = u3qf_cell(hed, tal);
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u3z(hed);
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u3z(tal);
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return ret;
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}
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else return _fuse_in(van, ref, sut, bix);
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}
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case c3__core:
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{
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return _fuse_repo(van, sut, ref, bix);
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}
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case c3__face: u3x_cell(u3t(sut), &p_sut, &q_sut);
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{
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u3_noun vot = _fuse_in(van, q_sut, ref, bix);
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u3_noun ret = u3qf_face(p_sut, vot);
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u3z(vot);
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return ret;
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}
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case c3__fuss: u3x_cell(u3t(sut), &p_sut, &q_sut);
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{
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u3_noun vot = _fuse_in(van, q_sut, ref, bix);
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u3_noun ret = u3qf_fuss(p_sut, vot);
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u3z(vot);
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return ret;
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}
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case c3__fork: p_sut = u3t(sut);
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{
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u3_noun yed = u3qdi_tap(p_sut, u3_nul);
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u3_noun ret = u3kf_fork(_fuse_in_fork(van, yed, ref, bix));
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u3z(yed);
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return ret;
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}
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case c3__hold:
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{
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u3_noun hud = u3nc(u3k(sut), u3k(ref));
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if ( c3y == u3qdi_has(bix, hud) ) {
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// u3_noun dun = u3qfu_dunq(van, "type", sut);
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// u3_noun niz = u3qfu_dunq(van, "over", ref);
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// u3t_push(u3nc(c3__mean, dun));
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// u3t_push(u3nc(c3__mean, niz));
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return u3m_error("fuse-loop");
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} else {
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u3_noun bux = u3qdi_put(bix, hud);
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u3_noun ret = _fuse_repo(van, sut, ref, bux);
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u3z(hud);
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u3z(bux);
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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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u3_noun
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_cqfu_fuse(u3_noun van,
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u3_noun sut,
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u3_noun ref)
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{
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return _fuse_in(van, sut, ref, u3_nul);
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}
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/* boilerplate
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*/
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u3_noun
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u3wfu_fuse(u3_noun cor)
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{
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u3_noun sut, ref, van;
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if ( (c3n == u3r_mean(cor, u3x_sam, &ref, u3x_con, &van, 0)) ||
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(u3_none == (sut = u3r_at(u3x_sam, van))) )
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{
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return u3m_bail(c3__fail);
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} else {
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return _cqfu_fuse(van, sut, ref);
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}
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}
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u3_noun
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u3qfu_fuse(u3_noun van,
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u3_noun sut,
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u3_noun ref)
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{
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c3_m fun_m = c3__fuse + !!u3r_at(u3qfu_van_vet, van);
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u3_noun pro = u3z_find_2(fun_m, sut, ref);
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if ( u3_none != pro ) {
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return pro;
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}
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else {
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pro = _cqfu_fuse(van, sut, ref);
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return u3z_save_2(fun_m, sut, ref, pro);
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}
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}
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