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/*
* libpinyin
* Library to deal with pinyin.
*
* Copyright (C) 2010 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 <locale.h>
#include "pinyin.h"
/* n-gram based sentence segment. */
/* Note:
* Currently libpinyin only supports ucs2 characters, as this is a
* pre-processor tool for raw corpus, it will skip all sentences
* which contains non-ucs2 characters.
*/
/* TODO:
* Try to add punctuation mark and english support,
* such as ',', '.', '?', '!', <english>, and other punctuations.
*/
PhraseLargeTable * g_phrase_table = NULL;
FacadePhraseIndex * g_phrase_index = NULL;
Bigram * g_system_bigram = NULL;
Bigram * g_user_bigram = NULL;
PhraseLookup * g_phrase_lookup = NULL;
enum CONTEXT_STATE{
CONTEXT_INIT,
CONTEXT_SEGMENTABLE,
CONTEXT_UNKNOWN
};
void print_help(){
printf("Usage: ngseg [--generate-extra-enter]\n");
}
bool deal_with_segmentable(GArray * current_utf16){
char * result_string = NULL;
MatchResults results = g_array_new(FALSE, FALSE, sizeof(phrase_token_t));
g_phrase_lookup->get_best_match(current_utf16->len, (utf16_t *) current_utf16->data, results);
#if 0
for ( size_t i = 0; i < results->len; ++i) {
phrase_token_t * token = &g_array_index(results, phrase_token_t, i);
if ( *token == null_token )
continue;
printf("%d:%d\t", i, *token);
}
printf("\n");
#endif
g_phrase_lookup->convert_to_utf8(results, "\n", result_string);
printf("%s\n", result_string);
g_array_free(results, TRUE);
g_free(result_string);
return true;
}
bool deal_with_unknown(GArray * current_utf16){
char * result_string = g_utf16_to_utf8
( (utf16_t *) current_utf16->data, current_utf16->len,
NULL, NULL, NULL);
printf("%s\n", result_string);
g_free(result_string);
return true;
}
int main(int argc, char * argv[]){
int i = 1;
bool gen_extra_enter = false;
setlocale(LC_ALL, "");
//deal with options.
while ( i < argc ){
if ( strcmp ("--help", argv[i]) == 0 ){
print_help();
exit(0);
} else if ( strcmp("--generate-extra-enter", argv[i]) == 0 ){
gen_extra_enter = true;
} else {
print_help();
exit(EINVAL);
}
++i;
}
//init phrase table
g_phrase_table = new PhraseLargeTable;
MemoryChunk * chunk = new MemoryChunk;
chunk->load("../../data/phrase_index.bin");
g_phrase_table->load(chunk);
//init phrase index
g_phrase_index = new FacadePhraseIndex;
chunk = new MemoryChunk;
chunk->load("../../data/gb_char.bin");
g_phrase_index->load(1, chunk);
chunk = new MemoryChunk;
chunk->load("../../data/gbk_char.bin");
g_phrase_index->load(2, chunk);
//init bi-gram
g_system_bigram = new Bigram;
g_system_bigram->attach("../../data/bigram.db", ATTACH_READONLY);
g_user_bigram = new Bigram;
//init phrase lookup
g_phrase_lookup = new PhraseLookup(g_phrase_table, g_phrase_index,
g_system_bigram, g_user_bigram);
CONTEXT_STATE state, next_state;
GArray * current_utf16 = g_array_new(TRUE, TRUE, sizeof(utf16_t));
phrase_token_t token = null_token;
//split the sentence
char * linebuf = NULL;
size_t size = 0;
ssize_t read;
while( (read = getline(&linebuf, &size, stdin)) != -1 ){
linebuf[strlen(linebuf) - 1] = '\0';
//check non-ucs2 characters
const glong num_of_chars = g_utf8_strlen(linebuf, -1);
glong len = 0;
utf16_t * sentence = g_utf8_to_utf16(linebuf, -1, NULL, &len, NULL);
if ( len != num_of_chars ) {
fprintf(stderr, "non-ucs2 characters encountered:%s.\n", linebuf);
printf("\n");
continue;
}
/* only new-line persists. */
if ( 0 == num_of_chars ) {
printf("\n");
continue;
}
state = CONTEXT_INIT;
bool result = g_phrase_table->search( 1, sentence, token);
g_array_append_val( current_utf16, sentence[0]);
if ( result & SEARCH_OK )
state = CONTEXT_SEGMENTABLE;
else
state = CONTEXT_UNKNOWN;
for ( int i = 1; i < num_of_chars; ++i) {
bool result = g_phrase_table->search( 1, sentence + i, token);
if ( result & SEARCH_OK )
next_state = CONTEXT_SEGMENTABLE;
else
next_state = CONTEXT_UNKNOWN;
if ( state == next_state ){
g_array_append_val(current_utf16, sentence[i]);
continue;
}
assert ( state != next_state );
if ( state == CONTEXT_SEGMENTABLE )
deal_with_segmentable(current_utf16);
if ( state == CONTEXT_UNKNOWN )
deal_with_unknown(current_utf16);
/* save the current character */
g_array_set_size(current_utf16, 0);
g_array_append_val(current_utf16, sentence[i]);
state = next_state;
}
if ( current_utf16->len ) {
/* this seems always true. */
if ( state == CONTEXT_SEGMENTABLE )
deal_with_segmentable(current_utf16);
if ( state == CONTEXT_UNKNOWN )
deal_with_unknown(current_utf16);
g_array_set_size(current_utf16, 0);
}
/* print extra enter */
if ( gen_extra_enter )
printf("\n");
}
/* print enter at file tail */
printf("\n");
g_array_free(current_utf16, TRUE);
free(linebuf);
return 0;
}
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