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189 lines
4.2 KiB
C
189 lines
4.2 KiB
C
/* j/6/peek.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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u3_noun
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_cqfu_peek(u3_noun, u3_noun, u3_noun, u3_atom);
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static u3_noun
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_peek_in(u3_noun, u3_noun, u3_noun, u3_atom, u3_noun);
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static u3_noun
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_peek_frog(u3_noun van, u3_noun p_sut, u3_noun way, u3_noun axe, u3_noun gil)
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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(_peek_in(van, u3h(p_sut), way, axe, gil),
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_peek_frog(van, u3t(p_sut), way, axe, gil));
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}
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}
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static u3_noun
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_peek_in(u3_noun van,
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u3_noun sut,
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u3_noun way,
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u3_atom axe,
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u3_noun gil)
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{
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u3_noun p_sut, q_sut;
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u3_noun pro;
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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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return c3__noun;
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}
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case c3__void: {
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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: {
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return c3__void;
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}
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case c3__cell: {
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if ( (c3n == u3r_trel(sut, 0, &p_sut, &q_sut)) ) {
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return u3m_bail(c3__fail);
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} else {
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u3_atom tip = u3qc_cap(axe);
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u3_atom tap = u3qc_mas(axe);
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if ( 2 == tip ) {
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pro = _cqfu_peek(van, p_sut, way, tap);
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}
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else {
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pro = _cqfu_peek(van, q_sut, way, tap);
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}
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u3z(tap);
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u3z(tip);
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return pro;
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}
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}
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case c3__core: {
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u3_noun pq_sut, qq_sut, rq_sut;
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u3_noun prq_sut, qrq_sut;
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if ( (c3n == u3r_trel(sut, 0, &p_sut, &q_sut)) ||
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(c3n == u3r_trel(q_sut, &pq_sut, &qq_sut, &rq_sut)) ||
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(c3n == u3r_cell(rq_sut, &prq_sut, &qrq_sut)) )
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{
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return u3m_bail(c3__fail);
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} else {
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u3_atom tip = u3qc_cap(axe);
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u3_atom tap = u3qc_mas(axe);
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if ( 3 == tip ) {
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if ( c3n == u3qfu_park(van, sut, way, tap) )
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{
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// u3_noun dun = u3qfu_dunq(van, "type", sut);
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u3_noun waz = u3qfu_shep
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(van, "axis", 'd', u3k(axe));
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// u3t_push(u3nc(c3__mean, dun));
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u3t_push(u3nc(c3__mean, waz));
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return u3m_error("peek-park");
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}
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else pro = _cqfu_peek(van, p_sut, way, tap);
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}
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else {
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pro = c3__noun;
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}
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u3z(tap);
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u3z(tip);
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return pro;
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}
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}
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case c3__face: {
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if ( (c3n == u3r_trel(sut, 0, &p_sut, &q_sut)) ) {
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return u3m_bail(c3__fail);
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} else {
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return _peek_in(van, q_sut, way, axe, gil);
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}
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}
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case c3__frog: {
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p_sut = u3t(sut);
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return u3kf_frog(_peek_frog(van, p_sut, way, axe, gil));
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}
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case c3__hold: {
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p_sut = u3t(sut);
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if ( (c3y == u3qdi_has(gil, sut)) ) {
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return c3__void;
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}
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else {
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u3_noun zoc = u3qdi_put(gil, sut);
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u3_noun fop = u3qfu_repo(van, sut);
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u3_noun pro = _peek_in(van, fop, way, axe, zoc);
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u3z(fop);
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u3z(zoc);
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return pro;
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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_peek(u3_noun van,
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u3_noun sut,
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u3_noun way,
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u3_atom axe)
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{
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if ( 1 == axe ) {
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return u3k(sut);
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}
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else return _peek_in(van, sut, way, axe, 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_peek(u3_noun cor)
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{
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u3_noun sut, way, axe, van;
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if ( (c3n == u3r_mean(cor, u3x_sam_2, &way,
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u3x_sam_3, &axe,
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u3x_con, &van,
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0)) ||
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(c3n == u3ud(axe)) ||
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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_peek(van, sut, way, axe);
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}
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}
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u3_noun
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u3qfu_peek(u3_noun van,
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u3_noun sut,
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u3_noun way,
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u3_noun axe)
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{
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c3_m fun_m = c3__peek + !!u3r_at(u3qfu_van_vet, van);
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u3_noun pro = u3z_find_3(fun_m, sut, way, axe);
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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_peek(van, sut, way, axe);
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return u3z_save_3(fun_m, sut, way, axe, pro);
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}
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}
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