1 files changed, 74 insertions, 0 deletions
diff --git a/vere/pkg/noun/jets/c/sew.c b/vere/pkg/noun/jets/c/sew.c
new file mode 100644
index 0000000..02359f7
--- /dev/null
+++ b/vere/pkg/noun/jets/c/sew.c
@@ -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
+        )
+{
+  c3_w b_w, c_w;
+  if (0 == c) return u3k(e);
+  if ( !_(u3r_safe_word(b, &b_w)) ||
+       !_(u3r_safe_word(c, &c_w)) ) {
+    return u3_none;
+  }
+  if ( !_(u3a_is_cat(a)) || (a >= 32) ) {
+    return u3m_bail(c3__fail);
+  }
+
+  c3_g a_g = a;
+  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);
+  }
+}