From 96a32415ab43377cf1575bd3f4f2980f58028209 Mon Sep 17 00:00:00 2001
From: Determinant <ted.sybil@gmail.com>
Date: Fri, 14 Aug 2015 11:51:42 +0800
Subject: add implementation for kaldi io (by ymz)

---
 kaldi_io/src/tools/openfst/include/fst/register.h | 133 ++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 kaldi_io/src/tools/openfst/include/fst/register.h

(limited to 'kaldi_io/src/tools/openfst/include/fst/register.h')

diff --git a/kaldi_io/src/tools/openfst/include/fst/register.h b/kaldi_io/src/tools/openfst/include/fst/register.h
new file mode 100644
index 0000000..ea3f4d8
--- /dev/null
+++ b/kaldi_io/src/tools/openfst/include/fst/register.h
@@ -0,0 +1,133 @@
+// register.h
+
+// 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), jpr@google.com (Jake Ratkiewicz)
+//
+// \file
+// Classes for registering derived Fsts for generic reading
+//
+
+#ifndef FST_LIB_REGISTER_H__
+#define FST_LIB_REGISTER_H__
+
+#include <string>
+
+
+#include <fst/compat.h>
+#include <iostream>
+#include <fstream>
+#include <sstream>
+#include <fst/util.h>
+#include <fst/generic-register.h>
+
+
+#include <fst/types.h>
+
+namespace fst {
+
+template <class A> class Fst;
+struct FstReadOptions;
+
+// This class represents a single entry in a FstRegister
+template<class A>
+struct FstRegisterEntry {
+  typedef Fst<A> *(*Reader)(istream &strm, const FstReadOptions &opts);
+  typedef Fst<A> *(*Converter)(const Fst<A> &fst);
+
+  Reader reader;
+  Converter converter;
+  FstRegisterEntry() : reader(0), converter(0) {}
+  FstRegisterEntry(Reader r, Converter c) : reader(r), converter(c) { }
+};
+
+// This class maintains the correspondence between a string describing
+// an FST type, and its reader and converter.
+template<class A>
+class FstRegister : public GenericRegister<string, FstRegisterEntry<A>,
+                                           FstRegister<A> > {
+ public:
+  typedef typename FstRegisterEntry<A>::Reader Reader;
+  typedef typename FstRegisterEntry<A>::Converter Converter;
+
+  const Reader GetReader(const string &type) const {
+    return this->GetEntry(type).reader;
+  }
+
+  const Converter GetConverter(const string &type) const {
+    return this->GetEntry(type).converter;
+  }
+
+ protected:
+  virtual string ConvertKeyToSoFilename(const string& key) const {
+    string legal_type(key);
+
+    ConvertToLegalCSymbol(&legal_type);
+
+    return legal_type + "-fst.so";
+  }
+};
+
+
+// This class registers an Fst type for generic reading and creating.
+// The Fst type must have a default constructor and a copy constructor
+// from 'Fst<Arc>' for this to work.
+template <class F>
+class FstRegisterer
+  : public GenericRegisterer<FstRegister<typename F::Arc> > {
+ public:
+  typedef typename F::Arc Arc;
+  typedef typename FstRegister<Arc>::Entry Entry;
+  typedef typename FstRegister<Arc>::Reader Reader;
+
+  FstRegisterer() :
+      GenericRegisterer<FstRegister<typename F::Arc> >(
+          F().Type(), BuildEntry()) {  }
+
+ private:
+  Entry BuildEntry() {
+    F *(*reader)(istream &strm,
+                 const FstReadOptions &opts) = &F::Read;
+
+    return Entry(reinterpret_cast<Reader>(reader),
+                 &FstRegisterer<F>::Convert);
+  }
+
+  static Fst<Arc> *Convert(const Fst<Arc> &fst) { return new F(fst); }
+};
+
+
+// Convenience macro to generate static FstRegisterer instance.
+#define REGISTER_FST(F, A) \
+static fst::FstRegisterer< F<A> > F ## _ ## A ## _registerer
+
+
+// Converts an fst to type 'type'.
+template <class A>
+Fst<A> *Convert(const Fst<A> &fst, const string &ftype) {
+  FstRegister<A> *registr = FstRegister<A>::GetRegister();
+  const typename FstRegister<A>::Converter
+      converter = registr->GetConverter(ftype);
+  if (!converter) {
+    string atype = A::Type();
+    LOG(ERROR) << "Fst::Convert: Unknown FST type \"" << ftype
+               << "\" (arc type = \"" << atype << "\")";
+    return 0;
+  }
+  return converter(fst);
+}
+
+}  // namespace fst
+
+#endif  // FST_LIB_REGISTER_H__
-- 
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