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diff --git a/src/include/fst/script/map.h b/src/include/fst/script/map.h
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+
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// Copyright 2005-2010 Google, Inc.
+// Author: jpr@google.com (Jake Ratkiewicz)
+
+#ifndef FST_SCRIPT_MAP_H_
+#define FST_SCRIPT_MAP_H_
+
+#include <fst/script/arg-packs.h>
+#include <fst/script/fst-class.h>
+#include <fst/script/weight-class.h>
+#include <fst/arc-map.h>
+#include <fst/state-map.h>
+
+namespace fst {
+namespace script {
+
+template <class M>
+Fst<typename M::ToArc> *ArcMap(const Fst<typename M::FromArc> &fst,
+                            const M &mapper) {
+  typedef typename M::ToArc ToArc;
+  VectorFst<ToArc> *ofst = new VectorFst<ToArc>;
+  ArcMap(fst, ofst, mapper);
+  return ofst;
+}
+
+template <class M>
+Fst<typename M::ToArc> *StateMap(const Fst<typename M::FromArc> &fst,
+                                 const M &mapper) {
+  typedef typename M::ToArc ToArc;
+  VectorFst<ToArc> *ofst = new VectorFst<ToArc>;
+  StateMap(fst, ofst, mapper);
+  return ofst;
+}
+
+enum MapType { ARC_SUM_MAPPER, IDENTITY_MAPPER, INVERT_MAPPER, PLUS_MAPPER,
+               QUANTIZE_MAPPER, RMWEIGHT_MAPPER, SUPERFINAL_MAPPER,
+               TIMES_MAPPER, TO_LOG_MAPPER, TO_LOG64_MAPPER, TO_STD_MAPPER };
+
+typedef args::Package<const FstClass&, MapType, float,
+                      const WeightClass &> MapInnerArgs;
+typedef args::WithReturnValue<FstClass*, MapInnerArgs> MapArgs;
+
+template <class Arc>
+void Map(MapArgs *args) {
+  const Fst<Arc> &ifst = *(args->args.arg1.GetFst<Arc>());
+  MapType map_type = args->args.arg2;
+  float delta =  args->args.arg3;
+  typename Arc::Weight w = *(args->args.arg4.GetWeight<typename Arc::Weight>());
+
+  if (map_type == ARC_SUM_MAPPER) {
+    args->retval = new FstClass(
+        script::StateMap(ifst, ArcSumMapper<Arc>(ifst)));
+  } else if (map_type == IDENTITY_MAPPER) {
+    args->retval = new FstClass(
+        script::ArcMap(ifst, IdentityArcMapper<Arc>()));
+  } else if (map_type == INVERT_MAPPER) {
+    args->retval = new FstClass(
+        script::ArcMap(ifst, InvertWeightMapper<Arc>()));
+  } else if (map_type == PLUS_MAPPER) {
+    args->retval = new FstClass(
+        script::ArcMap(ifst, PlusMapper<Arc>(w)));
+  } else if (map_type == QUANTIZE_MAPPER) {
+    args->retval = new FstClass(
+        script::ArcMap(ifst, QuantizeMapper<Arc>(delta)));
+  } else if (map_type == RMWEIGHT_MAPPER) {
+    args->retval = new FstClass(
+        script::ArcMap(ifst, RmWeightMapper<Arc>()));
+  } else if (map_type == SUPERFINAL_MAPPER) {
+    args->retval = new FstClass(
+        script::ArcMap(ifst, SuperFinalMapper<Arc>()));
+  } else if (map_type == TIMES_MAPPER) {
+    args->retval = new FstClass(
+        script::ArcMap(ifst, TimesMapper<Arc>(w)));
+  } else if (map_type == TO_LOG_MAPPER) {
+    args->retval = new FstClass(
+        script::ArcMap(ifst, WeightConvertMapper<Arc, LogArc>()));
+  } else if (map_type == TO_LOG64_MAPPER) {
+    args->retval = new FstClass(
+        script::ArcMap(ifst, WeightConvertMapper<Arc, Log64Arc>()));
+  } else if (map_type == TO_STD_MAPPER) {
+    args->retval = new FstClass(
+        script::ArcMap(ifst, WeightConvertMapper<Arc, StdArc>()));
+  } else {
+    FSTERROR() << "Error: unknown/unsupported mapper type: "
+               << map_type;
+    VectorFst<Arc> *ofst = new VectorFst<Arc>;
+    ofst->SetProperties(kError, kError);
+    args->retval = new FstClass(ofst);
+  }
+}
+
+
+#ifdef SWIG
+%newobject Map;
+#endif
+FstClass *Map(const FstClass& f, MapType map_type,
+         float delta = fst::kDelta,
+         const WeightClass &w = fst::script::WeightClass::Zero());
+
+}  // namespace script
+}  // namespace fst
+
+#endif  // FST_SCRIPT_MAP_H_