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/bin/fstintersect.cc | 88 +++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 88 insertions(+)
 create mode 100644 src/bin/fstintersect.cc

(limited to 'src/bin/fstintersect.cc')

diff --git a/src/bin/fstintersect.cc b/src/bin/fstintersect.cc
new file mode 100644
index 0000000..b3558fc
--- /dev/null
+++ b/src/bin/fstintersect.cc
@@ -0,0 +1,88 @@
+// fstintersect.cc
+
+// 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: riley@google.com (Michael Riley)
+// Modified: jpr@google.com (Jake Ratkiewicz) to use FstClass
+//
+// \file
+// Intersects two FSTs.
+//
+
+#include <fst/script/intersect.h>
+#include <fst/script/connect.h>
+
+DEFINE_string(compose_filter, "auto",
+              "Composition filter, one of: \"alt_sequence\", \"auto\", "
+              "\"match\", \"sequence\"");
+DEFINE_bool(connect, true, "Trim output");
+
+int main(int argc, char **argv) {
+  namespace s = fst::script;
+  using fst::script::FstClass;
+  using fst::script::VectorFstClass;
+
+
+  string usage = "Intersects two FSAs.\n\n  Usage: ";
+  usage += argv[0];
+  usage += " in1.fst in2.fst [out.fst]\n";
+  usage += "  Flags: connect\n";
+
+  std::set_new_handler(FailedNewHandler);
+  SetFlags(usage.c_str(), &argc, &argv, true);
+  if (argc < 3 || argc > 4) {
+    ShowUsage();
+    return 1;
+  }
+
+  string in1_name = strcmp(argv[1], "-") == 0 ? "" : argv[1];
+  string in2_name = strcmp(argv[2], "-") == 0 ? "" : argv[2];
+  string out_name = argc > 3 ? argv[3] : "";
+
+  if (in1_name.empty() && in2_name.empty()) {
+    LOG(ERROR) << argv[0] << ": Can't take both inputs from standard input.";
+    return 1;
+  }
+
+  FstClass *ifst1 = FstClass::Read(in1_name);
+  if (!ifst1) return 1;
+  FstClass *ifst2 = FstClass::Read(in2_name);
+  if (!ifst2) return 1;
+
+  VectorFstClass ofst(ifst1->ArcType());
+
+  fst::ComposeFilter compose_filter;
+
+  if (FLAGS_compose_filter == "alt_sequence") {
+    compose_filter = fst::ALT_SEQUENCE_FILTER;
+  } else if (FLAGS_compose_filter == "auto") {
+    compose_filter = fst::AUTO_FILTER;
+  } else if (FLAGS_compose_filter == "match") {
+    compose_filter = fst::MATCH_FILTER;
+  } else if (FLAGS_compose_filter == "sequence") {
+    compose_filter = fst::SEQUENCE_FILTER;
+  } else {
+    LOG(ERROR) << argv[0] << "Unknown compose filter type: "
+               << FLAGS_compose_filter;
+    return 1;
+  }
+
+  fst::IntersectOptions opts(FLAGS_connect, compose_filter);
+
+  s::Intersect(*ifst1, *ifst2, &ofst, opts);
+
+  ofst.Write(out_name);
+
+  return 0;
+}
-- 
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