mirror of
https://github.com/ilyakooo0/urbit.git
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263 lines
5.9 KiB
C
263 lines
5.9 KiB
C
/* j/6/crop.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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_crop_dext(u3_noun, u3_noun, u3_noun, u3_noun);
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static u3_noun
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_crop_sint(u3_noun, u3_noun, u3_noun, u3_noun);
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static u3_noun
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_crop_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 = _crop_dext(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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_crop_dext_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(_crop_dext(van, u3h(p_sut), ref, bix),
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_crop_dext_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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_crop_sint_fork(u3_noun van, u3_noun sut, u3_noun p_ref, u3_noun bix)
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{
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if ( u3_nul == p_ref ) {
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return u3k(sut);
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}
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else {
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u3_noun tuz = _crop_dext(van, sut, u3h(p_ref), bix);
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u3_noun zat = _crop_sint_fork(van, tuz, u3t(p_ref), bix);
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u3z(tuz);
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return zat;
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}
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}
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static u3_noun
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_crop_dext(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, p_ref, q_ref;
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if ( c3n == u3du(ref) ) {
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switch ( ref ) {
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case c3__void: return u3k(sut);
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case c3__noun: return c3__void;
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default: return u3m_bail(c3__fail);
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}
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}
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if ( c3y == u3r_sing(sut, ref) ) {
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return c3__void;
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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: return _crop_repo(van, sut, ref, bix);
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case c3__void: return c3__void;
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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 ( c3__atom == u3h(ref) ) {
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u3x_cell(u3t(ref), &p_ref, &q_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_sut, q_ref) ) {
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return c3__void;
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} else {
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return u3k(sut);
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}
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} else {
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return c3__void;
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}
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}
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else {
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if ( c3y == u3du(q_ref) ) {
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return u3k(sut);
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}
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else return c3__void;
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}
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}
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else if ( c3__cell == u3h(ref) ) {
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return u3k(sut);
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}
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else return _crop_sint(van, sut, ref, 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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if ( c3__atom == u3h(ref) ) {
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return u3k(sut);
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}
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else if ( c3__cell == u3h(ref) ) {
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u3x_cell(u3t(ref), &p_ref, &q_ref);
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if ( c3y == u3qfu_nest(van, p_ref, c3n, p_sut) )
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{
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u3_noun foz = _crop_dext(van, q_sut, q_ref, bix);
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u3_noun ret = u3qf_cell(p_sut, foz);
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u3z(foz);
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return ret;
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}
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else return u3k(sut);
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}
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else return _crop_sint(van, sut, ref, bix);
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}
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case c3__core:
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{
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if ( (c3__atom == u3h(ref)) ||
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(c3__cell == u3h(ref)) ) {
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return u3k(sut);
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}
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else return _crop_sint(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 foz = _crop_dext(van, q_sut, ref, bix);
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u3_noun ret = u3qf_face(p_sut, foz);
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u3z(foz);
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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(_crop_dext_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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# if 0
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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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# endif
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return u3m_error("crop-loop");
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} else {
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u3_noun bux = u3qdi_put(bix, hud);
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u3_noun ret = _crop_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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static u3_noun
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_crop_sint(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_ref, q_ref;
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switch ( u3h(ref) ) {
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default: return u3m_bail(c3__fail);
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case c3__core:
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case c3__face: u3x_cell(u3t(ref), &p_ref, &q_ref);
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{
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return _crop_dext(van, sut, q_ref, bix);
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}
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case c3__fork: p_ref = u3t(ref);
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{
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u3_noun yed = u3qdi_tap(p_ref, u3_nul);
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u3_noun ret = _crop_sint_fork(van, sut, yed, 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 rep = u3qfu_repo(van, ref);
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u3_noun ret = _crop_dext(van, sut, rep, bix);
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u3z(rep);
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return ret;
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}
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}
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}
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u3_noun
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_cqfu_crop(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 _crop_dext(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_crop(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_crop(van, sut, ref);
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}
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}
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u3_noun
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u3qfu_crop(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__crop + !!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_crop(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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