working

1 files changed, 52 insertions, 0 deletions

diff --git a/vere/pkg/noun/jets/b/skim.c b/vere/pkg/noun/jets/b/skim.c
new file mode 100644
index 0000000..56664c6
--- /dev/null
+++ b/vere/pkg/noun/jets/b/skim.c
@@ -0,0 +1,52 @@
+/// @file
+
+#include "jets/q.h"
+#include "jets/w.h"
+
+#include "noun.h"
+
+u3_noun
+u3qb_skim(u3_noun a, u3_noun b)
+{
+  u3_noun  pro;
+  u3_noun* lit = &pro;
+
+  if ( u3_nul != a) {
+    u3_noun   i, t = a;
+    u3_noun*   hed;
+    u3_noun*   tel;
+    u3j_site sit_u;
+    u3j_gate_prep(&sit_u, u3k(b));
+
+    do {
+      u3x_cell(t, &i, &t);
+
+      switch ( u3j_gate_slam(&sit_u, u3k(i)) ) {
+        case c3y: {
+          *lit = u3i_defcons(&hed, &tel);
+          *hed = u3k(i);
+          lit  = tel;
+        } break;
+
+        case c3n: break;
+
+        default: u3m_bail(c3__exit);
+      }
+    }
+    while ( u3_nul != t );
+
+    u3j_gate_lose(&sit_u);
+  }
+
+  *lit = u3_nul;
+
+  return pro;
+}
+
+u3_noun
+u3wb_skim(u3_noun cor)
+{
+  u3_noun a, b;
+  u3x_mean(cor, u3x_sam_2, &a, u3x_sam_3, &b, 0);
+  return u3qb_skim(a, b);
+}