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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <locale.h>
#include "pinyin_internal.h"
#include "utils_helper.h"
/* n-gram based sentence segment. */
/* Note:
* Currently libpinyin supports ucs4 characters.
* This is a pre-processor tool for raw corpus,
* and skips non-Chinese characters.
*/
/* TODO:
* Try to add punctuation mark and english support,
* such as ',', '.', '?', '!', <english>, and other punctuations.
*/
enum CONTEXT_STATE{
CONTEXT_INIT,
CONTEXT_SEGMENTABLE,
CONTEXT_UNKNOWN
};
void print_help(){
printf("Usage: ngseg [--generate-extra-enter]\n");
}
bool deal_with_segmentable(PhraseLookup * phrase_lookup,
GArray * current_ucs4){
char * result_string = NULL;
MatchResults results = g_array_new(FALSE, FALSE, sizeof(phrase_token_t));
phrase_lookup->get_best_match(current_ucs4->len,
(ucs4_t *) current_ucs4->data, results);
phrase_lookup->convert_to_utf8(results, "\n", result_string);
if (result_string) {
printf("%s\n", result_string);
} else {
char * tmp_string = g_ucs4_to_utf8
( (ucs4_t *) current_ucs4->data, current_ucs4->len,
NULL, NULL, NULL);
fprintf(stderr, "Un-segmentable sentence encountered:%s\n",
tmp_string);
g_array_free(results, TRUE);
return false;
}
g_array_free(results, TRUE);
g_free(result_string);
return true;
}
bool deal_with_unknown(GArray * current_ucs4){
char * result_string = g_ucs4_to_utf8
( (ucs4_t *) current_ucs4->data, current_ucs4->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 */
FacadePhraseTable2 phrase_table;
MemoryChunk * chunk = new MemoryChunk;
chunk->load("phrase_index.bin");
phrase_table.load(chunk, NULL);
/* init phrase index */
FacadePhraseIndex phrase_index;
if (!load_phrase_index(&phrase_index))
exit(ENOENT);
/* init bi-gram */
Bigram system_bigram;
system_bigram.attach("bigram.db", ATTACH_READONLY);
Bigram user_bigram;
/* init phrase lookup */
PhraseLookup phrase_lookup(&phrase_table, &phrase_index,
&system_bigram, &user_bigram);
CONTEXT_STATE state, next_state;
GArray * current_ucs4 = g_array_new(TRUE, TRUE, sizeof(ucs4_t));
PhraseTokens tokens;
memset(tokens, 0, sizeof(PhraseTokens));
phrase_index.prepare_tokens(tokens);
/* split the sentence */
char * linebuf = NULL; size_t size = 0; ssize_t read;
while( (read = getline(&linebuf, &size, stdin)) != -1 ){
if ( '\n' == linebuf[strlen(linebuf) - 1] ) {
linebuf[strlen(linebuf) - 1] = '\0';
}
/* check non-ucs4 characters */
const glong num_of_chars = g_utf8_strlen(linebuf, -1);
glong len = 0;
ucs4_t * sentence = g_utf8_to_ucs4(linebuf, -1, NULL, &len, NULL);
if ( len != num_of_chars ) {
fprintf(stderr, "non-ucs4 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 = phrase_table.search( 1, sentence, tokens);
g_array_append_val( current_ucs4, sentence[0]);
if ( result & SEARCH_OK )
state = CONTEXT_SEGMENTABLE;
else
state = CONTEXT_UNKNOWN;
for ( int i = 1; i < num_of_chars; ++i) {
bool result = phrase_table.search( 1, sentence + i, tokens);
if ( result & SEARCH_OK )
next_state = CONTEXT_SEGMENTABLE;
else
next_state = CONTEXT_UNKNOWN;
if ( state == next_state ){
g_array_append_val(current_ucs4, sentence[i]);
continue;
}
assert ( state != next_state );
if ( state == CONTEXT_SEGMENTABLE )
deal_with_segmentable(&phrase_lookup, current_ucs4);
if ( state == CONTEXT_UNKNOWN )
deal_with_unknown(current_ucs4);
/* save the current character */
g_array_set_size(current_ucs4, 0);
g_array_append_val(current_ucs4, sentence[i]);
state = next_state;
}
if ( current_ucs4->len ) {
/* this seems always true. */
if ( state == CONTEXT_SEGMENTABLE )
deal_with_segmentable(&phrase_lookup, current_ucs4);
if ( state == CONTEXT_UNKNOWN )
deal_with_unknown(current_ucs4);
g_array_set_size(current_ucs4, 0);
}
/* print extra enter */
if ( gen_extra_enter )
printf("\n");
}
phrase_index.destroy_tokens(tokens);
/* print enter at file tail */
printf("\n");
g_array_free(current_ucs4, TRUE);
free(linebuf);
return 0;
}
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