Bindings for the iteration interface of Perl hashes.

[perl4caml.git] / perl.ml

diff --git a/perl.ml b/perl.ml
index 23bc833..95d1629 100644 (file)
--- a/perl.ml
+++ b/perl.ml
@@ -1,6 +1,6 @@
 (* Interface to Perl from OCaml.
  * Copyright (C) 2003 Merjis Ltd.
- * $Id: perl.ml,v 1.13 2005-01-28 23:09:31 rich Exp $
+ * $Id: perl.ml,v 1.14 2005-01-29 12:22:49 rich Exp $
  *)
 
 type sv
@@ -111,6 +111,53 @@ external hv_delete : hv -> string -> unit = "perl4caml_hv_delete"
 external hv_clear : hv -> unit = "perl4caml_hv_clear"
 external hv_undef : hv -> unit = "perl4caml_hv_undef"
 
+type he
+external hv_iterinit : hv -> Int32.t = "perl4caml_hv_iterinit"
+external hv_iternext : hv -> he = "perl4caml_hv_iternext"
+external hv_iterkey : he -> string = "perl4caml_hv_iterkey"
+external hv_iterval : hv -> he -> sv = "perl4caml_hv_iterval"
+external hv_iternextsv : hv -> string * sv = "perl4caml_hv_iternextsv"
+
+let hv_of_assoc xs =
+  let hv = hv_empty () in
+  List.iter (fun (k, v) -> hv_set hv k v) xs;
+  hv
+let assoc_of_hv hv =
+  ignore (hv_iterinit hv);
+  (* Someone please rewrite this to make it tail-rec! - Rich. XXX *)
+  let rec loop acc =
+    try
+      let k, v = hv_iternextsv hv in
+      loop ((k, v) :: acc)
+    with
+       Not_found -> acc
+  in
+  loop []
+let hv_keys hv =
+  ignore (hv_iterinit hv);
+  (* Someone please rewrite this to make it tail-rec! - Rich. XXX *)
+  let rec loop acc =
+    try
+      let he = hv_iternext hv in
+      let k = hv_iterkey he in
+      loop (k :: acc)
+    with
+       Not_found -> acc
+  in
+  loop []
+let hv_values hv =
+  ignore (hv_iterinit hv);
+  (* Someone please rewrite this to make it tail-rec! - Rich. XXX *)
+  let rec loop acc =
+    try
+      let he = hv_iternext hv in
+      let v = hv_iterval hv he in
+      loop (v :: acc)
+    with
+       Not_found -> acc
+  in
+  loop []
+
 external get_sv : ?create:bool -> string -> sv = "perl4caml_get_sv"
 external get_av : ?create:bool -> string -> av = "perl4caml_get_av"
 external get_hv : ?create:bool -> string -> hv = "perl4caml_get_hv"