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///////////////////////////////////////////////////////////////////////
// File: dawg_cache.cpp
// Description: A class that knows about loading and caching dawgs.
// Author: David Eger
//
// (C) Copyright 2012, Google Inc.
// 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.
//
///////////////////////////////////////////////////////////////////////
#include "dawg_cache.h"
#include "dawg.h"
#include "object_cache.h"
#include "strngs.h"
#include "tessdatamanager.h"
namespace tesseract {
struct DawgLoader {
DawgLoader(const STRING &lang, TessdataType tessdata_dawg_type,
int dawg_debug_level, TessdataManager *data_file)
: lang_(lang),
data_file_(data_file),
tessdata_dawg_type_(tessdata_dawg_type),
dawg_debug_level_(dawg_debug_level) {}
Dawg *Load();
STRING lang_;
TessdataManager *data_file_;
TessdataType tessdata_dawg_type_;
int dawg_debug_level_;
};
Dawg *DawgCache::GetSquishedDawg(const STRING &lang,
TessdataType tessdata_dawg_type,
int debug_level, TessdataManager *data_file) {
std::string data_id = data_file->GetDataFileName();
data_id += kTessdataFileSuffixes[tessdata_dawg_type];
DawgLoader loader(lang, tessdata_dawg_type, debug_level, data_file);
return dawgs_.Get(data_id, std::bind(&DawgLoader::Load, &loader));
}
Dawg *DawgLoader::Load() {
TFile fp;
if (!data_file_->GetComponent(tessdata_dawg_type_, &fp)) return nullptr;
DawgType dawg_type;
PermuterType perm_type;
switch (tessdata_dawg_type_) {
case TESSDATA_PUNC_DAWG:
case TESSDATA_LSTM_PUNC_DAWG:
dawg_type = DAWG_TYPE_PUNCTUATION;
perm_type = PUNC_PERM;
break;
case TESSDATA_SYSTEM_DAWG:
case TESSDATA_LSTM_SYSTEM_DAWG:
dawg_type = DAWG_TYPE_WORD;
perm_type = SYSTEM_DAWG_PERM;
break;
case TESSDATA_NUMBER_DAWG:
case TESSDATA_LSTM_NUMBER_DAWG:
dawg_type = DAWG_TYPE_NUMBER;
perm_type = NUMBER_PERM;
break;
case TESSDATA_BIGRAM_DAWG:
dawg_type = DAWG_TYPE_WORD; // doesn't actually matter
perm_type = COMPOUND_PERM; // doesn't actually matter
break;
case TESSDATA_UNAMBIG_DAWG:
dawg_type = DAWG_TYPE_WORD;
perm_type = SYSTEM_DAWG_PERM;
break;
case TESSDATA_FREQ_DAWG:
dawg_type = DAWG_TYPE_WORD;
perm_type = FREQ_DAWG_PERM;
break;
default:
return nullptr;
}
auto *retval =
new SquishedDawg(dawg_type, lang_, perm_type, dawg_debug_level_);
if (retval->Load(&fp)) return retval;
delete retval;
return nullptr;
}
} // namespace tesseract
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