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urbit/jets/f/ut_crop.c
2016-01-16 16:47:36 -08:00

263 lines
5.9 KiB
C

/* j/6/crop.c
**
*/
#include "all.h"
/* logic
*/
static u3_noun
_crop_dext(u3_noun, u3_noun, u3_noun, u3_noun);
static u3_noun
_crop_sint(u3_noun, u3_noun, u3_noun, u3_noun);
static u3_noun
_crop_repo(u3_noun van,
u3_noun sut,
u3_noun ref,
u3_noun bix)
{
u3_noun rep = u3qfu_repo(van, sut);
u3_noun ret = _crop_dext(van, rep, ref, bix);
if ( c3y == u3r_sing(ret, rep) ) {
if ( c3__void == rep ) {
return c3__void;
} else {
u3z(rep);
u3z(ret);
return u3k(sut);
}
} else {
u3z(rep);
return ret;
}
}
static u3_noun
_crop_dext_fork(u3_noun van, u3_noun p_sut, u3_noun ref, u3_noun bix)
{
if ( u3_nul == p_sut ) {
return u3_nul;
}
else {
return u3nc(_crop_dext(van, u3h(p_sut), ref, bix),
_crop_dext_fork(van, u3t(p_sut), ref, bix));
}
}
static u3_noun
_crop_sint_fork(u3_noun van, u3_noun sut, u3_noun p_ref, u3_noun bix)
{
if ( u3_nul == p_ref ) {
return u3k(sut);
}
else {
u3_noun tuz = _crop_dext(van, sut, u3h(p_ref), bix);
u3_noun zat = _crop_sint_fork(van, tuz, u3t(p_ref), bix);
u3z(tuz);
return zat;
}
}
static u3_noun
_crop_dext(u3_noun van,
u3_noun sut,
u3_noun ref,
u3_noun bix)
{
u3_noun p_sut, q_sut, p_ref, q_ref;
if ( c3n == u3du(ref) ) {
switch ( ref ) {
case c3__void: return u3k(sut);
case c3__noun: return c3__void;
default: return u3m_bail(c3__fail);
}
}
if ( c3y == u3r_sing(sut, ref) ) {
return c3__void;
}
if ( c3n == u3du(sut) ) switch ( sut ) {
default: return u3m_bail(c3__fail);
case c3__noun: return _crop_repo(van, sut, ref, bix);
case c3__void: return c3__void;
}
else switch ( u3h(sut) ) {
default: return u3m_bail(c3__fail);
case c3__atom: u3x_cell(u3t(sut), &p_sut, &q_sut);
{
if ( c3__atom == u3h(ref) ) {
u3x_cell(u3t(ref), &p_ref, &q_ref);
if ( c3y == u3du(q_sut) ) {
if ( c3y == u3du(q_ref) ) {
if ( c3y == u3r_sing(q_sut, q_ref) ) {
return c3__void;
} else {
return u3k(sut);
}
} else {
return c3__void;
}
}
else {
if ( c3y == u3du(q_ref) ) {
return u3k(sut);
}
else return c3__void;
}
}
else if ( c3__cell == u3h(ref) ) {
return u3k(sut);
}
else return _crop_sint(van, sut, ref, bix);
}
case c3__cell: u3x_cell(u3t(sut), &p_sut, &q_sut);
{
if ( c3__atom == u3h(ref) ) {
return u3k(sut);
}
else if ( c3__cell == u3h(ref) ) {
u3x_cell(u3t(ref), &p_ref, &q_ref);
if ( c3y == u3qfu_nest(van, p_ref, c3n, p_sut) )
{
u3_noun foz = _crop_dext(van, q_sut, q_ref, bix);
u3_noun ret = u3qf_cell(p_sut, foz);
u3z(foz);
return ret;
}
else return u3k(sut);
}
else return _crop_sint(van, sut, ref, bix);
}
case c3__core:
{
if ( (c3__atom == u3h(ref)) ||
(c3__cell == u3h(ref)) ) {
return u3k(sut);
}
else return _crop_sint(van, sut, ref, bix);
}
case c3__face: u3x_cell(u3t(sut), &p_sut, &q_sut);
{
u3_noun foz = _crop_dext(van, q_sut, ref, bix);
u3_noun ret = u3qf_face(p_sut, foz);
u3z(foz);
return ret;
}
case c3__fork: p_sut = u3t(sut);
{
u3_noun yed = u3qdi_tap(p_sut, u3_nul);
u3_noun ret = u3kf_fork(_crop_dext_fork(van, yed, ref, bix));
u3z(yed);
return ret;
}
case c3__hold:
{
u3_noun hud = u3nc(u3k(sut), u3k(ref));
if ( c3y == u3qdi_has(bix, hud) ) {
# if 0
u3_noun dun = u3qfu_dunq(van, "type", sut);
u3_noun niz = u3qfu_dunq(van, "over", ref);
u3t_push(u3nc(c3__mean, dun));
u3t_push(u3nc(c3__mean, niz));
# endif
return u3m_error("crop-loop");
} else {
u3_noun bux = u3qdi_put(bix, hud);
u3_noun ret = _crop_repo(van, sut, ref, bux);
u3z(hud);
u3z(bux);
return ret;
}
}
}
}
static u3_noun
_crop_sint(u3_noun van,
u3_noun sut,
u3_noun ref,
u3_noun bix)
{
u3_noun p_ref, q_ref;
switch ( u3h(ref) ) {
default: return u3m_bail(c3__fail);
case c3__core:
case c3__face: u3x_cell(u3t(ref), &p_ref, &q_ref);
{
return _crop_dext(van, sut, q_ref, bix);
}
case c3__fork: p_ref = u3t(ref);
{
u3_noun yed = u3qdi_tap(p_ref, u3_nul);
u3_noun ret = _crop_sint_fork(van, sut, yed, bix);
u3z(yed);
return ret;
}
case c3__hold:
{
u3_noun rep = u3qfu_repo(van, ref);
u3_noun ret = _crop_dext(van, sut, rep, bix);
u3z(rep);
return ret;
}
}
}
u3_noun
_cqfu_crop(u3_noun van,
u3_noun sut,
u3_noun ref)
{
return _crop_dext(van, sut, ref, u3_nul);
}
/* boilerplate
*/
u3_noun
u3wfu_crop(u3_noun cor)
{
u3_noun sut, ref, van;
if ( (c3n == u3r_mean(cor, u3x_sam, &ref, u3x_con, &van, 0)) ||
(u3_none == (sut = u3r_at(u3x_sam, van))) )
{
return u3m_bail(c3__fail);
} else {
return _cqfu_crop(van, sut, ref);
}
}
u3_noun
u3qfu_crop(u3_noun van,
u3_noun sut,
u3_noun ref)
{
c3_m fun_m = c3__crop + !!u3r_at(u3qfu_van_vet, van);
u3_noun pro = u3z_find_2(fun_m, sut, ref);
if ( u3_none != pro ) {
return pro;
}
else {
pro = _cqfu_crop(van, sut, ref);
return u3z_save_2(fun_m, sut, ref, pro);
}
}