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      1 
      2 // Licensed under the Apache License, Version 2.0 (the "License");
      3 // you may not use this file except in compliance with the License.
      4 // You may obtain a copy of the License at
      5 //
      6 //     http://www.apache.org/licenses/LICENSE-2.0
      7 //
      8 // Unless required by applicable law or agreed to in writing, software
      9 // distributed under the License is distributed on an "AS IS" BASIS,
     10 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     11 // See the License for the specific language governing permissions and
     12 // limitations under the License.
     13 //
     14 // Copyright 2005-2010 Google, Inc.
     15 // Author: allauzen (at) google.com (Cyril Allauzen)
     16 
     17 #ifndef FST_EXTENSIONS_FAR_EQUAL_H_
     18 #define FST_EXTENSIONS_FAR_EQUAL_H_
     19 
     20 #include <string>
     21 
     22 #include <fst/extensions/far/far.h>
     23 #include <fst/equal.h>
     24 
     25 namespace fst {
     26 
     27 template <class Arc>
     28 bool FarEqual(const string &filename1,
     29              const string &filename2,
     30              float delta = kDelta,
     31              const string &begin_key = string(),
     32              const string &end_key = string()) {
     33 
     34   FarReader<Arc> *reader1 = FarReader<Arc>::Open(filename1);
     35   FarReader<Arc> *reader2 = FarReader<Arc>::Open(filename2);
     36   if (!reader1 || !reader2) {
     37     delete reader1;
     38     delete reader2;
     39     VLOG(1) << "FarEqual: cannot open input Far file(s)";
     40     return false;
     41   }
     42 
     43   if (!begin_key.empty()) {
     44     bool find_begin1 = reader1->Find(begin_key);
     45     bool find_begin2 = reader2->Find(begin_key);
     46     if (!find_begin1 || !find_begin2) {
     47       bool ret = !find_begin1 && !find_begin2;
     48       if (!ret) {
     49         VLOG(1) << "FarEqual: key \"" << begin_key << "\" missing from "
     50                 << (find_begin1 ? "second" : "first") << " archive.";
     51       }
     52       delete reader1;
     53       delete reader2;
     54       return ret;
     55     }
     56   }
     57 
     58   for(; !reader1->Done() && !reader2->Done();
     59       reader1->Next(), reader2->Next()) {
     60     const string key1 = reader1->GetKey();
     61     const string key2 = reader2->GetKey();
     62     if (!end_key.empty() && end_key < key1 && end_key < key2) {
     63       delete reader1;
     64       delete reader2;
     65       return true;
     66     }
     67     if (key1 != key2) {
     68       VLOG(1) << "FarEqual: mismatched keys \""
     69               << key1 << "\" <> \"" << key2 << "\".";
     70       delete reader1;
     71       delete reader2;
     72       return false;
     73     }
     74     if (!Equal(reader1->GetFst(), reader2->GetFst(), delta)) {
     75       VLOG(1) << "FarEqual: Fsts for key \"" << key1 << "\" are not equal.";
     76       delete reader1;
     77       delete reader2;
     78       return false;
     79     }
     80   }
     81 
     82   if (!reader1->Done() || !reader2->Done()) {
     83     VLOG(1) << "FarEqual: key \""
     84             << (reader1->Done() ? reader2->GetKey() : reader1->GetKey())
     85             << "\" missing form " << (reader2->Done() ? "first" : "second")
     86             << " archive.";
     87     delete reader1;
     88     delete reader2;
     89     return false;
     90   }
     91 
     92   delete reader1;
     93   delete reader2;
     94   return true;
     95 }
     96 
     97 }  // namespace fst
     98 
     99 #endif  // FST_EXTENSIONS_FAR_EQUAL_H_
    100