1 files changed, 47 insertions, 0 deletions
diff --git a/vere/pkg/noun/jets/d/by_has.c b/vere/pkg/noun/jets/d/by_has.c
new file mode 100644
index 0000000..24bcb31
--- /dev/null
+++ b/vere/pkg/noun/jets/d/by_has.c
@@ -0,0 +1,47 @@
+/// @file
+
+#include "jets/k.h"
+#include "jets/q.h"
+#include "jets/w.h"
+
+#include "noun.h"
+
+u3_noun
+u3qdb_has(u3_noun a,
+          u3_noun b)
+{
+  if ( u3_nul == a ) {
+    return c3n;
+  }
+  else {
+    u3_noun n_a, lr_a;
+    u3_noun pn_a;
+    u3x_cell(a, &n_a, &lr_a);
+    u3x_cell(n_a, &pn_a, 0);
+
+    if ( (c3y == u3r_sing(b, pn_a)) ) {
+      return c3y;
+    }
+    else {
+      return ( c3y == u3qc_gor(b, pn_a) ) ? u3qdb_has(u3h(lr_a), b)
+                                          : u3qdb_has(u3t(lr_a), b);
+    }
+  }
+}
+
+u3_noun
+u3wdb_has(u3_noun cor)
+{
+  u3_noun a, b;
+  u3x_mean(cor, u3x_sam, &b, u3x_con_sam, &a, 0);
+  return u3qdb_has(a, b);
+}
+
+u3_noun
+u3kdb_has(u3_noun a,
+          u3_noun b)
+{
+  u3_noun c = u3qdb_has(a, b);
+  u3z(a); u3z(b);
+  return c;
+}