mirror of
https://github.com/ilyakooo0/urbit.git
synced 2024-12-22 14:21:34 +03:00
51 lines
743 B
C
51 lines
743 B
C
/* j/3/peg.c
|
|
**
|
|
*/
|
|
#include "all.h"
|
|
|
|
|
|
/* functions
|
|
*/
|
|
u3_noun
|
|
u3qc_peg(u3_atom a,
|
|
u3_atom b)
|
|
{
|
|
if ( 1 == b ) {
|
|
return u3k(a);
|
|
}
|
|
|
|
u3_atom c, d, e, f, g, h;
|
|
|
|
c = u3r_met(0, b);
|
|
d = u3qa_dec(c);
|
|
e = u3qc_lsh(0, d, 1);
|
|
f = u3qa_sub(b, e);
|
|
g = u3qc_lsh(0, d, a);
|
|
h = u3qa_add(f, g);
|
|
|
|
u3z(c);
|
|
u3z(d);
|
|
u3z(e);
|
|
u3z(f);
|
|
u3z(g);
|
|
|
|
return h;
|
|
}
|
|
u3_noun
|
|
u3wc_peg(u3_noun cor)
|
|
{
|
|
u3_noun a, b;
|
|
|
|
if ( (c3n == u3r_mean(cor, u3x_sam_2, &a, u3x_sam_3, &b, 0)) ||
|
|
(0 == a) ||
|
|
(0 == b) ||
|
|
(c3n == u3ud(b)) ||
|
|
(c3n == u3ud(a) && b != 1) )
|
|
{
|
|
return u3m_bail(c3__exit);
|
|
} else {
|
|
return u3qc_peg(a, b);
|
|
}
|
|
}
|
|
|