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)

---
 .../openfst/include/fst/extensions/far/extract.h   | 140 +++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 kaldi_io/src/tools/openfst/include/fst/extensions/far/extract.h

(limited to 'kaldi_io/src/tools/openfst/include/fst/extensions/far/extract.h')

diff --git a/kaldi_io/src/tools/openfst/include/fst/extensions/far/extract.h b/kaldi_io/src/tools/openfst/include/fst/extensions/far/extract.h
new file mode 100644
index 0000000..95866de
--- /dev/null
+++ b/kaldi_io/src/tools/openfst/include/fst/extensions/far/extract.h
@@ -0,0 +1,140 @@
+// extract-main.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)
+// Modified: jpr@google.com (Jake Ratkiewicz) to use the new arc-dispatch
+
+// \file
+// Extracts component FSTs from an finite-state archive.
+//
+
+#ifndef FST_EXTENSIONS_FAR_EXTRACT_H__
+#define FST_EXTENSIONS_FAR_EXTRACT_H__
+
+#include <string>
+#include <vector>
+using std::vector;
+
+#include <fst/extensions/far/far.h>
+
+namespace fst {
+
+template<class Arc>
+inline void FarWriteFst(const Fst<Arc>* fst, string key,
+                        string* okey, int* nrep,
+                        const int32 &generate_filenames, int i,
+                        const string &filename_prefix,
+                        const string &filename_suffix) {
+  if (key == *okey)
+    ++*nrep;
+  else
+    *nrep = 0;
+
+  *okey = key;
+
+  string ofilename;
+  if (generate_filenames) {
+    ostringstream tmp;
+    tmp.width(generate_filenames);
+    tmp.fill('0');
+    tmp << i;
+    ofilename = tmp.str();
+  } else {
+    if (*nrep > 0) {
+      ostringstream tmp;
+      tmp << '.' << nrep;
+      key.append(tmp.str().data(), tmp.str().size());
+    }
+    ofilename = key;
+  }
+  fst->Write(filename_prefix + ofilename + filename_suffix);
+}
+
+template<class Arc>
+void FarExtract(const vector<string> &ifilenames,
+                const int32 &generate_filenames,
+                const string &keys,
+                const string &key_separator,
+                const string &range_delimiter,
+                const string &filename_prefix,
+                const string &filename_suffix) {
+  FarReader<Arc> *far_reader = FarReader<Arc>::Open(ifilenames);
+  if (!far_reader) return;
+
+  string okey;
+  int nrep = 0;
+
+  vector<char *> key_vector;
+  // User has specified a set of fsts to extract, where some of the "fsts" could
+  // be ranges.
+  if (!keys.empty()) {
+    char *keys_cstr = new char[keys.size()+1];
+    strcpy(keys_cstr, keys.c_str());
+    SplitToVector(keys_cstr, key_separator.c_str(), &key_vector, true);
+    int i = 0;
+    for (int k = 0; k < key_vector.size(); ++k, ++i) {
+      string key = string(key_vector[k]);
+      char *key_cstr = new char[key.size()+1];
+      strcpy(key_cstr, key.c_str());
+      vector<char *> range_vector;
+      SplitToVector(key_cstr, range_delimiter.c_str(), &range_vector, false);
+      if (range_vector.size() == 1) {  // Not a range
+        if (!far_reader->Find(key)) {
+          LOG(ERROR) << "FarExtract: Cannot find key: " << key;
+          return;
+        }
+        const Fst<Arc> &fst = far_reader->GetFst();
+        FarWriteFst(&fst, key, &okey, &nrep, generate_filenames, i,
+                    filename_prefix, filename_suffix);
+      } else if (range_vector.size() == 2) {  // A legal range
+        string begin_key = string(range_vector[0]);
+        string end_key = string(range_vector[1]);
+        if (begin_key.empty() || end_key.empty()) {
+          LOG(ERROR) << "FarExtract: Illegal range specification: " << key;
+          return;
+        }
+        if (!far_reader->Find(begin_key)) {
+          LOG(ERROR) << "FarExtract: Cannot find key: " << begin_key;
+          return;
+        }
+        for ( ; !far_reader->Done(); far_reader->Next(), ++i) {
+          string ikey = far_reader->GetKey();
+          if (end_key < ikey) break;
+          const Fst<Arc> &fst = far_reader->GetFst();
+          FarWriteFst(&fst, ikey, &okey, &nrep, generate_filenames, i,
+                      filename_prefix, filename_suffix);
+        }
+      } else {
+        LOG(ERROR) << "FarExtract: Illegal range specification: " << key;
+        return;
+      }
+      delete key_cstr;
+    }
+    delete keys_cstr;
+    return;
+  }
+  // Nothing specified: extract everything.
+  for (int i = 1; !far_reader->Done(); far_reader->Next(), ++i) {
+    string key = far_reader->GetKey();
+    const Fst<Arc> &fst = far_reader->GetFst();
+    FarWriteFst(&fst, key, &okey, &nrep, generate_filenames, i,
+                filename_prefix, filename_suffix);
+  }
+  return;
+}
+
+}  // namespace fst
+
+#endif  // FST_EXTENSIONS_FAR_EXTRACT_H__
-- 
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