1 files changed, 46 insertions, 0 deletions
diff --git a/vere/pkg/noun/jets/d/in_tap.c b/vere/pkg/noun/jets/d/in_tap.c
new file mode 100644
index 0000000..a9af4f1
--- /dev/null
+++ b/vere/pkg/noun/jets/d/in_tap.c
@@ -0,0 +1,46 @@
+/// @file
+
+#include "jets/k.h"
+#include "jets/q.h"
+#include "jets/w.h"
+
+#include "noun.h"
+
+static u3_noun
+_tap_in(u3_noun a,
+        u3_noun b)
+{
+  if ( u3_nul == a ) {
+    return b;
+  }
+  else {
+    u3_noun n_a, l_a, r_a;
+    u3x_trel(a, &n_a, &l_a, &r_a);
+
+    return _tap_in(r_a,
+                   u3nc(u3k(n_a),
+                   _tap_in(l_a, b)));
+  }
+}
+
+u3_noun
+u3qdi_tap(u3_noun a)
+{
+  return _tap_in(a, u3_nul);
+}
+
+u3_noun
+u3wdi_tap(u3_noun cor)
+{
+  u3_noun a;
+  u3x_mean(cor, u3x_con_sam, &a, 0);
+  return u3qdi_tap(a);
+}
+
+u3_noun
+u3kdi_tap(u3_noun a)
+{
+  u3_noun b = u3qdi_tap(a);
+  u3z(a);
+  return b;
+}