1 files changed, 63 insertions, 0 deletions
diff --git a/vere/pkg/noun/jets/d/by_jab.c b/vere/pkg/noun/jets/d/by_jab.c
new file mode 100644
index 0000000..597e454
--- /dev/null
+++ b/vere/pkg/noun/jets/d/by_jab.c
@@ -0,0 +1,63 @@
+/// @file
+
+#include "jets/q.h"
+#include "jets/w.h"
+
+#include "noun.h"
+
+u3_noun
+u3kdb_jab(u3_noun a,
+          u3_noun key,
+          u3_noun fun)
+  {
+    if ( u3_nul == a ) {
+      return u3m_bail(c3__exit);
+    }
+    else {
+      u3_noun n_a, lr_a;
+      u3_noun pn_a, qn_a;
+      u3_noun pro;
+      u3x_cell(a, &n_a, &lr_a);
+      u3x_cell(n_a, &pn_a, &qn_a);
+      
+      if ( (c3y == u3r_sing(key, pn_a)) ) {
+        u3_noun value = u3n_slam_on(fun, u3k(qn_a));
+        pro = u3nc(u3nc(u3k(u3h(u3h(a))), value), u3k(u3t(a)));
+        u3z(a); u3z(key);
+        return pro;
+      }
+      else {
+        u3_noun l_a, r_a;
+        u3x_cell(lr_a, &l_a, &r_a);
+        
+        u3k(n_a); u3k(l_a); u3k(r_a);
+        if ( c3y == u3qc_gor(key, pn_a) ) {
+          pro = u3nt(n_a, u3kdb_jab(l_a, key, fun), r_a);
+        }
+        else {
+          pro = u3nt(n_a, l_a, u3kdb_jab(r_a, key, fun));
+        }
+        u3z(a);
+        return pro;
+    }
+  }
+}
+
+u3_noun
+u3qdb_jab(u3_noun a,
+          u3_noun key,
+          u3_noun fun)
+{
+  return u3kdb_jab(u3k(a), u3k(key), u3k(fun));
+}
+
+u3_noun
+u3wdb_jab(u3_noun cor)
+{
+  u3_noun a, key, fun;
+  u3x_mean(cor, u3x_sam_2,   &key,
+                u3x_sam_3,   &fun,
+                u3x_con_sam, &a, 0);
+
+  return u3qdb_jab(a, key, fun);
+}