From f4c12fce1ee58e670f9c3fce46c40296ba9ee8a2 Mon Sep 17 00:00:00 2001
From: Ian Hodson <idh@google.com>
Date: Wed, 30 May 2012 21:27:06 +0100
Subject: Add openfst to external, as used by GoogleTTS

Moved from GoogleTTS

Change-Id: I6bc6bdadaa53bd0f810b88443339f6d899502cc8
---
 src/include/fst/script/randgen.h | 76 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 src/include/fst/script/randgen.h

(limited to 'src/include/fst/script/randgen.h')

diff --git a/src/include/fst/script/randgen.h b/src/include/fst/script/randgen.h
new file mode 100644
index 0000000..817f9c1
--- /dev/null
+++ b/src/include/fst/script/randgen.h
@@ -0,0 +1,76 @@
+
+// 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_RANDGEN_H_
+#define FST_SCRIPT_RANDGEN_H_
+
+#include <fst/script/arg-packs.h>
+#include <fst/script/fst-class.h>
+#include <fst/randgen.h>
+
+namespace fst {
+namespace script {
+
+enum RandArcSelection {
+  UNIFORM_ARC_SELECTOR,
+  LOG_PROB_ARC_SELECTOR,
+  FAST_LOG_PROB_ARC_SELECTOR
+};
+
+typedef args::Package<const FstClass &, MutableFstClass*, int32,
+                      const RandGenOptions<RandArcSelection> &> RandGenArgs;
+
+template<class Arc>
+void RandGen(RandGenArgs *args) {
+  const Fst<Arc> &ifst = *(args->arg1.GetFst<Arc>());
+  MutableFst<Arc> *ofst = args->arg2->GetMutableFst<Arc>();
+  int32 seed = args->arg3;
+  const RandGenOptions<RandArcSelection> &opts = args->arg4;
+
+  if (opts.arc_selector == UNIFORM_ARC_SELECTOR) {
+    UniformArcSelector<Arc> arc_selector(seed);
+    RandGenOptions< UniformArcSelector<Arc> >
+        ropts(arc_selector, opts.max_length,
+              opts.npath, opts.weighted);
+    RandGen(ifst, ofst, ropts);
+  } else if (opts.arc_selector == FAST_LOG_PROB_ARC_SELECTOR) {
+    FastLogProbArcSelector<Arc> arc_selector(seed);
+    RandGenOptions< FastLogProbArcSelector<Arc> >
+        ropts(arc_selector, opts.max_length,
+              opts.npath, opts.weighted);
+    RandGen(ifst, ofst, ropts);
+  } else {
+    LogProbArcSelector<Arc> arc_selector(seed);
+    RandGenOptions< LogProbArcSelector<Arc> >
+        ropts(arc_selector, opts.max_length,
+              opts.npath, opts.weighted);
+    RandGen(ifst, ofst, ropts);
+  }
+}
+
+
+// Client-facing prototype
+void RandGen(const FstClass &ifst, MutableFstClass *ofst, int32 seed = time(0),
+             const RandGenOptions<RandArcSelection> &opts =
+             fst::RandGenOptions<fst::script::RandArcSelection>(
+                 fst::script::UNIFORM_ARC_SELECTOR));
+
+}  // namespace script
+}  // namespace fst
+
+
+
+#endif  // FST_SCRIPT_RANDGEN_H_
-- 
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