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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 LOOKUP_H
#define LOOKUP_H
/** @file lookup.h
* @brief the definitions of common lookup related classes and structs.
*/
namespace pinyin{
typedef phrase_token_t lookup_key_t;
struct lookup_value_t{
/* previous and current tokens of the node */
phrase_token_t m_handles[2];
/* maximum possibility of current node */
gfloat m_poss;
/* trace back information for final step */
gint32 m_last_step;
lookup_value_t(gfloat poss = FLT_MAX){
m_handles[0] = null_token; m_handles[1] = null_token;
m_poss = poss;
m_last_step = -1;
}
};
class PinyinLargeTable;
class PhraseLargeTable;
class FacadePhraseIndex;
class Bigram;
/* Note:
* LookupStepIndex:
* the main purpose of lookup step index is served for an index
* for lookup step content, which can quickly merge the same node
* with different possibilities,
* then only keep the highest value of the node.
* LookupStepContent:
* the place to store the lookup values of current step,
* and indexed by lookup step index.
* See also comments on lookup_value_t.
*/
typedef GHashTable * LookupStepIndex;
/* Key: lookup_key_t, Value: int m, index to m_steps_content[i][m] */
typedef GArray * LookupStepContent; /* array of lookup_value_t */
};
#endif
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