Hash table iterators exposed, with new macro.

* eval.c (eval_init): Register hash-begin and hash-next intrinsics.

* lisplib.c (hash_set_entries, hash_instantiate): New static functions.
(lisplib_init): Register new tables in dl_table.

* share/txr/stdlib/hash.tl: New file.

* txr.1: Document with-hash-iter macro.

1 files changed, 15 insertions, 0 deletions

diff --git a/lisplib.c b/lisplib.c
index 81240da3..53898c08 100644
--- a/lisplib.c
+++ b/lisplib.c
@@ -214,6 +214,20 @@ static val with_stream_instantiate(val set_fun)
   return nil;
 }
 
+static val hash_set_entries(val dlt, val fun)
+{
+  val name[] = { lit("with-hash-table-iter"), nil };
+  set_dlt_entries(dlt, name, fun);
+  return nil;
+}
+
+static val hash_instantiate(val set_fun)
+{
+  funcall1(set_fun, nil);
+  load(format(nil, lit("~a/hash.tl"), stdlib_path, nao));
+  return nil;
+}
+
 val dlt_register(val dlt,
                  val (*instantiate)(val),
                  val (*set_entries)(val, val))
@@ -233,6 +247,7 @@ void lisplib_init(void)
   dlt_register(dl_table, path_test_instantiate, path_test_set_entries);
   dlt_register(dl_table, struct_instantiate, struct_set_entries);
   dlt_register(dl_table, with_stream_instantiate, with_stream_set_entries);
+  dlt_register(dl_table, hash_instantiate, hash_set_entries);
 }
 
 val lisplib_try_load(val sym)