urbit · pkova · Feb 25, 2025 · Aug 6, 2024 · Aug 6, 2024 · Aug 6, 2024
@@ -235,6 +235,7 @@ const c_source_files = [_][]const u8{
     "jets/c/rig.c",
     "jets/c/rip.c",
     "jets/c/rsh.c",
+    "jets/c/sew.c",
     "jets/c/sqt.c",
     "jets/c/swp.c",
     "jets/c/xeb.c",

@@ -1084,6 +1084,7 @@ static u3j_core _137_two__in_d[] =
 static u3j_harm _137_two_rig_a[] = {{".2", u3wc_rig, c3n}, {}};
 
 static u3j_harm _137_two_mate_a[] = {{".2", u3wb_mate, c3y}, {}};
+static u3j_harm _137_two_sew_a[]  = {{".2", u3wc_sew, c3y}, {}};
 
 static u3j_core _137_two_d[] =
   { { "tri", 3, 0, _137_tri_d, no_hashes, _137_tri_ho },
@@ -1142,6 +1143,7 @@ static u3j_core _137_two_d[] =
     { "swp",  7, _137_two_swp_a, 0, no_hashes },
     { "rub",  7, _137_two_rub_a, 0, no_hashes },
     { "pow",  7, _137_two_pow_a, 0, no_hashes },
+    { "sew",  7, _137_two_sew_a, 0, no_hashes },
     { "sqt",  7, _137_two_sqt_a, 0, no_hashes },
     { "xeb",  7, _137_two_xeb_a, 0, no_hashes },
 

@@ -0,0 +1,74 @@
+/// @file
+
+#include "jets/q.h"
+#include "jets/w.h"
+
+#include "noun.h"
+
+u3_weak
+u3qc_sew(u3_atom a,
+         u3_atom b,
+         u3_atom c,
+         u3_atom d,
+         u3_atom e
+        )
+{
+  if (0 == c) return u3k(e);
+  if ( !_(u3a_is_cat(b)) ||
+       !_(u3a_is_cat(c)) ) {
+    return u3_none;
+  }
+  if ( !_(u3a_is_cat(a)) || (a >= 32) ) {
+    return u3m_bail(c3__fail);
+  }
+
+  c3_g a_g = a;
+  c3_w b_w = b, c_w = c;
+  c3_w len_e_w = u3r_met(a_g, e);
+  u3i_slab sab_u;
+  c3_w* src_w;
+  c3_w len_src_w;
+  if ( _(u3a_is_cat(e)) ) {
+    len_src_w = e ? 1 : 0;
+    src_w = &e;
+  }
+  else {
+    u3a_atom* src_u = u3a_to_ptr(e);
+    len_src_w = src_u->len_w;
+    src_w = src_u->buf_w;
+  }
+  u3i_slab_init(&sab_u, a_g, c3_max(len_e_w, b_w + c_w));
+  u3r_chop_words(a_g, 0, b_w, 0, sab_u.buf_w, len_src_w, src_w);
+  u3r_chop(a_g, 0, c_w, b_w, sab_u.buf_w, d);
+  if (len_e_w > b_w + c_w) {
+    u3r_chop_words(a_g,
+             b_w + c_w,
+             len_e_w - (b_w + c_w),
+             b_w + c_w,
+             sab_u.buf_w,
+             len_src_w,
+             src_w);
+  }
+  return u3i_slab_mint(&sab_u);
+}
+
+u3_weak
+u3wc_sew(u3_noun cor)
+{
+  u3_noun a, b, c, d, e;
+  if ( (c3n == u3r_mean(cor, u3x_sam_2,  &a,
+                             u3x_sam_12, &b,
+                                    106, &c,
+                                    107, &d,
+                              u3x_sam_7, &e, 0)) ||
+       (c3n == u3ud(a)) ||
+       (c3n == u3ud(b)) ||
+       (c3n == u3ud(c)) ||
+       (c3n == u3ud(d)) ||
+       (c3n == u3ud(e)) )
+  {
+    return u3m_bail(c3__fail);
+  } else {
+    return u3qc_sew(a, b, c, d, e);
+  }
+}
@@ -79,6 +79,7 @@
     u3_noun u3qc_rig(u3_atom, u3_atom, u3_atom);
     u3_noun u3qc_rip(u3_atom, u3_atom, u3_atom);
     u3_noun u3qc_rsh(u3_atom, u3_atom, u3_atom);
+    u3_noun u3qc_sew(u3_atom, u3_atom, u3_atom, u3_atom, u3_atom);
     u3_noun u3qc_swp(u3_atom, u3_atom);
     u3_noun u3qc_sqt(u3_atom);
 

@@ -82,6 +82,7 @@
     u3_noun u3wc_rig(u3_noun);
     u3_noun u3wc_rip(u3_noun);
     u3_noun u3wc_rsh(u3_noun);
+    u3_noun u3wc_sew(u3_noun);
     u3_noun u3wc_swp(u3_noun);
     u3_noun u3wc_sqt(u3_noun);