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diff --git a/src/lookup/pinyin_lookup2.h b/src/lookup/pinyin_lookup2.h
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-/* 
- *  libzhuyin
- *  Library to deal with zhuyin.
- *  
- *  Copyright (C) 2012 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 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., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
- */
-
-
-#ifndef PINYIN_LOOKUP2_H
-#define PINYIN_LOOKUP2_H
-
-
-#include <float.h>
-#include <glib.h>
-#include "novel_types.h"
-#include "chewing_key.h"
-#include "phrase_index.h"
-#include "ngram.h"
-#include "lookup.h"
-
-
-namespace zhuyin{
-
-/**
- * pinyin_lookup2.h
- *
- * The definitions of pinyin lookup related classes and structs.
- *
- */
-
-
-
-enum constraint_type{NO_CONSTRAINT, CONSTRAINT_ONESTEP, CONSTRAINT_NOSEARCH };
-
-struct lookup_constraint_t{
-    /* current type of the step */
-    constraint_type m_type;
-
-    /* Note:
-     *   value of m_type:
-     *     NO_CONSTRAINT:
-     *       no values in the below union.
-     *       search all possible next words.
-     *     CONSTRAINT_ONESTEP:
-     *       m_token contains the next word.
-     *       only one word can be used to search for the next step,
-     *       use case for user selected candidates.
-     *     CONSTRAINT_NOSEARCH:
-     *       m_constraint_step contains the value
-     *       which points back to the CONSTRAINT_ONESTEP step.
-     *       no search is allowed for the current step.
-     */
-
-    union{
-	phrase_token_t m_token;
-	guint32 m_constraint_step; /* index of m_token */
-    };
-};
-
-
-/**
- * PinyinLookup2:
- *
- * The pinyin lookup class to convert pinyin keys to guessed sentence.
- *
- */
-class PinyinLookup2{
-private:
-    const gfloat bigram_lambda;
-    const gfloat unigram_lambda;
-
-    PhraseItem m_cache_phrase_item;
-    SingleGram m_merged_single_gram;
-
-protected:
-    /* saved varibles */
-    CandidateConstraints m_constraints;
-    ChewingKeyVector m_keys;
-
-    pinyin_option_t m_options;
-    FacadeChewingTable * m_pinyin_table;
-    FacadePhraseIndex * m_phrase_index;
-    Bigram * m_system_bigram;
-    Bigram * m_user_bigram;
-
-    /* internal step data structure */
-    GPtrArray * m_steps_index;
-    /* Array of LookupStepIndex */
-    GPtrArray * m_steps_content;
-    /* Array of LookupStepContent */
-
-
-    bool search_unigram2(GPtrArray * topresults, int nstep,
-                         PhraseIndexRanges ranges);
-    bool search_bigram2(GPtrArray * topresults, int nstep,
-                        PhraseIndexRanges ranges);
-
-    bool unigram_gen_next_step(int nstep, lookup_value_t * cur_step, phrase_token_t token);
-    bool bigram_gen_next_step(int nstep, lookup_value_t * cur_step, phrase_token_t token, gfloat bigram_poss);
-
-    bool save_next_step(int next_step_pos, lookup_value_t * cur_step, lookup_value_t * next_step);
-
-    bool final_step(MatchResults & results);
-
-public:
-    /**
-     * PinyinLookup2::PinyinLookup2:
-     * @lambda: the lambda parameter for interpolation model.
-     * @options: the pinyin options.
-     * @pinyin_table: the pinyin table.
-     * @phrase_index: the phrase index.
-     * @system_bigram: the system bi-gram.
-     * @user_bigram: the user bi-gram.
-     *
-     * The constructor of the PinyinLookup2.
-     *
-     */
-    PinyinLookup2(const gfloat lambda,
-                  pinyin_option_t options,
-                  FacadeChewingTable * pinyin_table,
-                  FacadePhraseIndex * phrase_index,
-                  Bigram * system_bigram,
-                  Bigram * user_bigram);
-
-    /**
-     * PinyinLookup2::~PinyinLookup2:
-     *
-     * The destructor of the PinyinLookup2.
-     *
-     */
-    ~PinyinLookup2();
-
-    /**
-     * PinyinLookup2::set_options:
-     * @options: the pinyin options.
-     * @returns: whether the set operation is successful.
-     *
-     * Set the pinyin options.
-     *
-     */
-    bool set_options(pinyin_option_t options) {
-        m_options = options;
-        return true;
-    }
-
-    /**
-     * PinyinLookup2::get_best_match:
-     * @prefixes: the phrase tokens before the guessed sentence.
-     * @keys: the pinyin keys of the guessed sentence.
-     * @constraints: the constraints on the guessed sentence.
-     * @results: the guessed sentence in the form of the phrase tokens.
-     * @returns: whether the guess operation is successful.
-     *
-     * Guess the best sentence according to user inputs.
-     *
-     */
-    bool get_best_match(TokenVector prefixes, ChewingKeyVector keys, CandidateConstraints constraints, MatchResults & results);
-
-    /**
-     * PinyinLookup2::train_result2:
-     * @keys: the pinyin keys of the guessed sentence.
-     * @constraints: the constraints on the guessed sentence.
-     * @results: the guessed sentence in the form of the phrase tokens.
-     * @returns: whether the train operation is successful.
-     *
-     * Self learning the guessed sentence based on the constraints.
-     *
-     */
-    bool train_result2(ChewingKeyVector keys, CandidateConstraints constraints, MatchResults results);
-
-    /**
-     * PinyinLookup2::convert_to_utf8:
-     * @results: the guessed sentence in the form of the phrase tokens.
-     * @result_string: the guessed sentence in the utf8 encoding.
-     * @returns: whether the convert operation is successful.
-     *
-     * Convert the guessed sentence from the phrase tokens to the utf8 string.
-     *
-     */
-    bool convert_to_utf8(MatchResults results,
-                         /* out */ char * & result_string)
-    {
-        return zhuyin::convert_to_utf8(m_phrase_index, results,
-                                       NULL, false, result_string);
-    }
-
-
-    /**
-     * PinyinLookup2::add_constraint:
-     * @constraints: the constraints on the guessed sentence.
-     * @index: the character offset in the guessed sentence.
-     * @token: the phrase token in the candidate list chosen by user.
-     * @returns: the number of the characters in the chosen token.
-     *
-     * Add one constraint to the constraints on the guessed sentence.
-     *
-     */
-    int add_constraint(CandidateConstraints constraints, size_t index, phrase_token_t token);
-
-    /**
-     * PinyinLookup2::clear_constraint:
-     * @constraints: the constraints on the guessed sentence.
-     * @index: the character offset in the guessed sentence.
-     * @returns: whether the clear operation is successful.
-     *
-     * Clear one constraint in the constraints on the guessed sentence.
-     *
-     */
-    bool clear_constraint(CandidateConstraints constraints, int index);
-
-    /**
-     * PinyinLookup2::validate_constraint:
-     * @constraints: the constraints on the guessed sentence.
-     * @keys: the pinyin keys of the guessed sentence.
-     * @returns: whether the validate operation is successful.
-     *
-     * Validate the old constraints with the new pinyin keys.
-     *
-     */
-    bool validate_constraint(CandidateConstraints constraints, ChewingKeyVector keys);
-
-};
-
-};
-
-#endif