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/*
* libpinyin
* Library to deal with pinyin.
*
* Copyright (C) 2025 Peng Wu <alexepico@gmail.com>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "ngram.h"
#include <assert.h>
#include <errno.h>
#include <tkrzw_dbm_hash.h>
#include <tkrzw_dbm_tiny.h>
#include <tkrzw_str_util.h>
#include "tkrzwdb_utils.h"
using namespace pinyin;
using namespace tkrzw;
Bigram::Bigram(){
m_db = NULL;
}
Bigram::~Bigram(){
reset();
}
void Bigram::reset(){
if ( m_db ){
m_db->Close();
delete m_db;
m_db = NULL;
}
}
bool Bigram::load_db(const char * dbfile){
reset();
/* create in-memory db. */
m_db = new TinyDBM;
HashDBM tmp_db;
if (tmp_db.Open(dbfile, false, File::OPEN_NO_CREATE) != Status::SUCCESS)
return false;
copy_tkrzwdb(&tmp_db, m_db);
tmp_db.Close();
return true;
}
bool Bigram::save_db(const char * dbfile){
if (!m_db)
return false;
Status status = RemoveFile(dbfile);
if (status != Status::SUCCESS && status != Status::NOT_FOUND_ERROR)
return false;
HashDBM tmp_db;
if (tmp_db.Open(dbfile, true, File::OPEN_DEFAULT) != Status::SUCCESS)
return false;
copy_tkrzwdb(m_db, &tmp_db);
tmp_db.Synchronize(false);
tmp_db.Close();
return true;
}
bool Bigram::attach(const char * dbfile, guint32 flags){
bool writable = false;
reset();
int32_t options = attach_options(flags, writable);
if (!dbfile)
return false;
m_db = new HashDBM;
return m_db->Open(dbfile, writable, options).IsOK();
}
/* Use DB interface. */
bool Bigram::load(phrase_token_t index, SingleGram * & single_gram,
bool copy){
single_gram = NULL;
if ( !m_db )
return false;
std::string_view key(reinterpret_cast<const char*>(&index), sizeof(phrase_token_t));
std::string value;
Status status = m_db->Get(key, &value);
if (!status.IsOK())
return false;
size_t vsiz = value.size();
m_chunk.set_size(vsiz);
memcpy(m_chunk.begin(), value.data(), vsiz);
single_gram = new SingleGram(m_chunk.begin(), vsiz, copy);
return true;
}
bool Bigram::store(phrase_token_t index, SingleGram * single_gram){
if ( !m_db )
return false;
std::string_view key(reinterpret_cast<const char*>(&index), sizeof(phrase_token_t));
std::string_view value(reinterpret_cast<const char*>(single_gram->m_chunk.begin()),
single_gram->m_chunk.size());
return m_db->Set(key, value).IsOK();
}
bool Bigram::remove(/* in */ phrase_token_t index){
if ( !m_db )
return false;
std::string_view key(reinterpret_cast<const char*>(&index), sizeof(phrase_token_t));
return m_db->Remove(key).IsOK();
}
class KeyCollectProcessor : public DBM::RecordProcessor {
private:
GArray * m_items;
public:
KeyCollectProcessor(GArray * items) : m_items(items) {}
std::string_view ProcessFull(std::string_view key, std::string_view value) override {
assert(key.size() == sizeof(phrase_token_t));
const phrase_token_t * token = reinterpret_cast<const phrase_token_t *>(key.data());
g_array_append_val(m_items, *token);
return NOOP;
}
std::string_view ProcessEmpty(std::string_view key) override {
return NOOP;
}
};
bool Bigram::get_all_items(GArray * items){
g_array_set_size(items, 0);
if ( !m_db )
return false;
KeyCollectProcessor processor(items);
Status status = m_db->ProcessEach(&processor, false);
return status.IsOK();
}
/* Note: sync mask_out code with ngram_bdb.cpp. */
bool Bigram::mask_out(phrase_token_t mask, phrase_token_t value){
GArray * items = g_array_new(FALSE, FALSE, sizeof(phrase_token_t));
if (!get_all_items(items)) {
g_array_free(items, TRUE);
return false;
}
for (size_t i = 0; i < items->len; ++i) {
phrase_token_t index = g_array_index(items, phrase_token_t, i);
if ((index & mask) == value) {
check_result(remove(index));
continue;
}
SingleGram * gram = NULL;
check_result(load(index, gram));
int num = gram->mask_out(mask, value);
if (0 == num) {
delete gram;
continue;
}
if (0 == gram->get_length()) {
check_result(remove(index));
} else {
check_result(store(index, gram));
}
delete gram;
}
g_array_free(items, TRUE);
return true;
}
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