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/*
* libpinyin
* Library to deal with pinyin.
*
* Copyright (C) 2006-2007 Peng Wu
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef PHRASE_LOOKUP_H
#define PHRASE_LOOKUP_H
#include "novel_types.h"
#include "lookup.h"
/** @file phrase_lookup.h
* @brief the definitions of phrase lookup related classes and structs.
*/
class PhraseLookup{
private:
static const gfloat bigram_lambda = LAMBDA_PARAMETER;
static const gfloat unigram_lambda = 1 - LAMBDA_PARAMETER;
PhraseItem m_cache_phrase_item;
protected:
//saved varibles
PhraseLargeTable * m_phrase_table;
FacadePhraseIndex * m_phrase_index;
Bigram * m_bigram;
//internal step data structure
GPtrArray * m_steps_index;
/* Array of LookupStepIndex */
GPtrArray * m_steps_content;
/* Array of LookupStepContent */
/* Saved sentence */
int m_sentence_length;
utf16_t * m_sentence;
protected:
/* Explicitly search the next phrase,
* to avoid double phrase lookup as the next token has only one.
*/
bool search_unigram(int nstep, phrase_token_t token);
bool search_bigram(int nstep, phrase_token_t token);
bool unigram_gen_next_step(int nstep, lookup_value_t * cur_value, phrase_token_t token);
bool bigram_gen_next_step(int nstep, lookup_value_t * cur_value, phrase_token_t token, gfloat bigram_poss);
bool save_next_step(int next_step_pos, lookup_value_t * cur_value, lookup_value_t * next_step);
bool final_step(MatchResults & results);
public:
PhraseLookup(PhraseLargeTable * phrase_table,
FacadePhraseIndex * phrase_index,
Bigram * bigram);
~PhraseLookup();
/* Note: this method only accepts the characters in phrase large table. */
bool get_best_match(int sentence_length, utf16_t sentence[], MatchResults & results);
/* Note: free the phrase by g_free */
bool convert_to_utf8(MatchResults results, /* in */ const char * delimiter, /* out */ char * & result_string);
};
#endif
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