1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/*
* 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 PINYIN_LOOKUP_H
#define PINYIN_LOOKUP_H
#include <float.h>
#include <glib.h>
#include "novel_types.h"
#include "pinyin_base.h"
#include "lookup.h"
class WinnerTree;
/** @file pinyin_lookup.h
* @brief 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 */
};
};
typedef GArray * CandidateConstraints; /* Array of lookup_constraint_t */
/* Note:
* winner tree for beam search.
*/
class IBranchIterator{
public:
virtual ~IBranchIterator(){}
virtual bool has_next() = 0;
virtual lookup_value_t next() = 0;
virtual lookup_value_t max() = 0;
};
class PinyinLookup{
private:
static const gfloat bigram_lambda = LAMBDA_PARAMETER;
static const gfloat unigram_lambda = 1 - LAMBDA_PARAMETER;
PhraseItem m_cache_phrase_item;
protected:
//saved varibles
CandidateConstraints m_constraints;
PinyinKeyVector m_keys;
PinyinLargeTable * m_pinyin_table;
FacadePhraseIndex * m_phrase_index;
PinyinCustomSettings * m_custom;
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 */
GArray * m_table_cache;
/* Array of PhraseIndexRanges,
* PhraseIndexRanges is an array of GArray of PhraseIndexRange,
* indexed by phrase library (only contains enabled phrase libraries).
*/
WinnerTree * m_winner_tree;
size_t prepare_table_cache(int nstep, int total_pinyin);
bool search_unigram(IBranchIterator * iter, int nstep, int npinyin);
bool search_bigram(IBranchIterator * iter, int nstep, int npinyin);
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:
PinyinLookup( PinyinCustomSettings * custom, PinyinLargeTable * pinyin_table, FacadePhraseIndex * phrase_index, Bigram * system_bigram, Bigram * user_bigram);
~PinyinLookup();
bool get_best_match(PinyinKeyVector keys, CandidateConstraints constraints, MatchResults & results);
bool train_result(PinyinKeyVector keys, CandidateConstraints constraints, MatchResults & results);
bool convert_to_utf8(MatchResults results, /* out */ char * & result_string);
bool add_constraint(CandidateConstraints constraints, size_t index, phrase_token_t token);
bool clear_constraint(CandidateConstraints constraints, size_t index);
bool validate_constraint(CandidateConstraints constraints, PinyinKeyVector m_parsed_keys);
/* init pinyin table lookup array */
bool prepare_pinyin_lookup(PhraseIndexRanges ranges);
/* destroy pinyin table lookup array */
bool destroy_pinyin_lookup(PhraseIndexRanges ranges);
};
#endif
|
