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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
|
/*
* novel-pinyin,
* A Simplified Chinese Sentence-Based Pinyin Input Method Engine
* Based On Markov Model.
*
* 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
*/
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <limits.h>
#include <locale.h>
#include <glib.h>
#include "novel_types.h"
static GHashTable * g_phrases;
struct SegmentStep{
phrase_token_t m_handle;
char * m_phrase;
//use formula W = No. of words. Zero handle means one word.
size_t m_nword;
//backtracing information, -1 one step backward.
gint8 m_backward_nstep;
};
//read gb_char.table and gbk_char.table
bool init_phrases(FILE * infile){
char pinyin[256];
char phrase[256];
phrase_token_t token;
size_t freq;
while (!feof(infile)){
fscanf(infile, "%s", pinyin);
fscanf(infile, "%s", phrase);
fscanf(infile, "%d", &token);
fscanf(infile, "%ld", &freq);
if ( feof(infile) )
break;
g_hash_table_insert(g_phrases, g_strdup(phrase),
GUINT_TO_POINTER(token));
}
return true;
}
bool segment(GHashTable * phrases, // Lookup Phrases
const char * phrase,
GArray * strings /* Array of const char * */){
GArray * steps = g_array_new(TRUE, TRUE, sizeof(SegmentStep));
GArray * offsets = g_array_new(TRUE, TRUE, sizeof(size_t));
//construct dynamic programming.
size_t phrase_length = g_utf8_strlen(phrase, -1);
const char * p = phrase;
size_t offset = p - phrase;
g_array_append_val(offsets, offset);
g_array_set_size(steps, phrase_length + 1);
for ( size_t i = 0 ; i < phrase_length; ++i){
p = g_utf8_next_char(p);
offset = p - phrase;
g_array_append_val(offsets, offset);
}
assert( *p == '\0' );
//initialize segment steps values.
for ( size_t i = 0; i < phrase_length + 1; ++i){
SegmentStep* step = &g_array_index(steps, SegmentStep, i);
step->m_nword = UINT_MAX;
}
for ( size_t i = 0 ; i < phrase_length + 1; ++i){
size_t* offset_begin = &g_array_index(offsets, size_t, i);
const char * phrase_begin = phrase + *offset_begin;
SegmentStep * step_begin = &g_array_index(steps, SegmentStep, i);
size_t nword = step_begin->m_nword;
for ( size_t k = i + 1; k < phrase_length + 1; ++k){
size_t* offset_end = &g_array_index(offsets, size_t, k);
size_t len = *offset_end - *offset_begin;
char * cur_phrase = g_strndup(phrase_begin, len);
phrase_token_t token;
gpointer orig_key, value;
gboolean result = g_hash_table_lookup_extended
(phrases, cur_phrase, &orig_key, &value);
if ( result ){
token = GPOINTER_TO_UINT(value);
}else{
token = 0;
if ( 1 != k - i ){ //skip non-phrase
g_free(cur_phrase);
continue;
}
}
++nword;
SegmentStep * step_end = &g_array_index(steps, SegmentStep, k);
if ( nword < step_end->m_nword){
if ( step_end->m_phrase ){
g_free(step_end->m_phrase);
step_end->m_phrase = NULL;
}
step_end->m_handle = token;
step_end->m_phrase = cur_phrase;
step_end->m_nword = nword;
step_end->m_backward_nstep = k - i;
}else{
g_free(cur_phrase);
}
}
}
//backtracing to get the result.
size_t cur_step = phrase_length;
g_array_set_size(strings, 0);
while ( cur_step ){
SegmentStep* step_end = &g_array_index(steps, SegmentStep, cur_step);
char * str_dup = g_strdup(step_end->m_phrase);
g_array_append_val(strings, str_dup);
cur_step = cur_step - step_end->m_backward_nstep;
}
for ( size_t i = 0; i < strings->len / 2; ++i){
char ** phrase_head = &g_array_index(strings, char * , i);
char ** phrase_tail = &g_array_index(strings, char * , strings->len -1 - i);
char * phrase_tmp;
phrase_tmp = * phrase_head;
* phrase_head = * phrase_tail;
* phrase_tail = phrase_tmp;
}
//free strndup memory
for ( size_t i = 0; i < steps->len; ++i){
SegmentStep* step = &g_array_index(steps, SegmentStep, i);
if ( step->m_phrase ){
g_free(step->m_phrase);
step->m_phrase = NULL;
}
}
g_array_free(offsets, TRUE);
g_array_free(steps, TRUE);
return true;
}
void print_help(){
printf("Usage: mmseg [--generate-extra-enter]\n");
exit(1);
}
int main(int argc, char * argv[]){
int i = 1;
bool gen_extra_enter = false;
setlocale(LC_ALL,"");
while ( i < argc ){
if ( strcmp("--help", argv[i] ) == 0) {
print_help();
}else if ( strcmp("--generate-extra-enter", argv[i]) == 0) {
gen_extra_enter = true;
}
++i;
}
g_phrases = g_hash_table_new_full(g_str_hash, g_str_equal, g_free, NULL);
//init phrase lookup
FILE * gb_file = fopen("../../data/gb_char.table", "r");
if ( gb_file == NULL ){
fprintf(stderr, "can't open gb_char.table!\n");
exit(1);
}
init_phrases(gb_file);
fclose(gb_file);
FILE * gbk_file = fopen("../../data/gbk_char.table", "r");
if ( gbk_file == NULL ){
fprintf(stderr, "can't open gbk_char.table!\n");
exit(1);
}
init_phrases(gbk_file);
fclose(gbk_file);
char* linebuf = (char *)malloc ( 1024 * sizeof (char) );
size_t size = 1024;
while( getline(&linebuf, &size, stdin) ){
if ( feof(stdin) )
break;
linebuf[strlen(linebuf)-1] = '\0';
GArray * phrases = g_array_new(TRUE, TRUE, sizeof( char *));
segment(g_phrases, linebuf, phrases);
for ( size_t i = 0; i < phrases->len; ++i){
char * phrase = g_array_index(phrases, char *, i);
printf("%s\n", phrase);
g_free(phrase);
}
if ( gen_extra_enter )
printf("\n");
g_array_free(phrases, TRUE);
}
free(linebuf);
}
|
