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/*
* libpinyin
* Library to deal with pinyin.
*
* Copyright (C) 2013 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.
*/
#include "pinyin_internal.h"
void print_help(){
printf("Usage: spseg [--generate-extra-enter] [-o outputfile] [inputfile]\n");
}
/* data structure definition. */
typedef struct{
phrase_token_t m_token;
gint m_token_len;
} TokenInfo;
/* GArray of ucs4 characters. */
typedef GArray * UnicodeCharVector;
/* GArray of TokenInfo. */
typedef GArray * TokenInfoVector;
gint calculate_sequence_length(TokenInfoVector * tokens) {
gint len = 0;
size_t i = 0;
for (i = 0; i < tokens->len; ++i) {
TokenInfo * token_info = &g_array_index(tokens, TokenInfo, i);
len += token_info->len;
}
return len;
}
/* if merge sequence found, merge and output it,
* if not, just output the first token;
* pop the first token or sequence.
*/
bool merge_sequence(PhraseLargeTable2 * phrase_table,
FacadePhraseIndex * phrase_index,
UnicodeCharVector * unichars,
TokenInfoVector * tokens) {
assert(tokens->len > 0);
bool found = false;
TokenInfo * token_info = NULL;
gint token_len = 0;
phrase_token_t token = null_token;
const gunichar * ucs4_str = (const gunichar *)unichars->data;
PhraseTokens tokens;
memset(tokens, 0, sizeof(PhraseTokens));
phrase_index->prepare_tokens(tokens);
/* search the merge sequence. */
size_t index = tokens->len;
gint seq_len = calculate_sequence_length(tokens);
while (seq_len > 0) {
/* do phrase table search. */
phrase_index->clear_tokens(tokens);
int retval = phrase_table->search(seq_len, ucs4_str, tokens);
if (retval & SEARCH_OK) {
int num = get_first_token(tokens, token);
found = true;
break;
}
--index;
token_info = &g_array_index(tokens, TokenInfo, index);
seq_len -= token_info->m_token_len;
}
phrase_index->destroy_tokens(tokens);
/* push the merged sequence back. */
if (found) {
/* pop up the origin sequence. */
g_array_remove_range(tokens, 0, index);
TokenInfo info;
info.m_token = token;
info.m_token_len = seq_len;
g_array_prepend_val(tokens, info);
}
return found;
}
bool pop_first_token(UnicodeCharVector * unichars,
TokenInfoVector * tokens,
FILE * output) {
const gunichar * ucs4_str = (const gunichar *)unichars->data;
/* pop it. */
token_info = &g_array_index(tokens, TokenInfo, 0);
token = token_info->m_token;
token_len = token_info->m_token_len;
glong read = 0;
gchar * utf8_str = g_ucs4_to_utf8(ucs4_str, token_len, &read, NULL, NULL);
assert(read == token_len);
fprintf(output, "%d %s\n", token, utf8_str);
g_free(utf8_str);
g_array_remove_range(unichars, 0, token_len);
g_array_remove_index(tokens, 0);
return true;
}
bool feed_line(PhraseLargeTable2 * phrase_table,
FacadePhraseIndex * phrase_index,
UnicodeCharVector * unichars,
TokenInfoVector * tokens,
const char * line,
FILE * output) {
TAGLIB_PARSE_SEGMENTED_LINE(phrase_index, token, line);
if (null_token == token) {
/* empty the queue. */
while (0 != tokens->len) {
merge_sequence(phrase_table, phrase_index, unichars, tokens);
pop_first_token(unichars, tokens, output);
}
assert(0 == unichars->len);
assert(0 == tokens->len);
return false;
}
PhraseItem item;
phrase_index->get_phrase_item(token, item);
guint8 len = item.get_phrase_length();
TokenInfo info;
info.m_token = token;
info.m_token_len = len;
g_array_append_val(tokens, info);
ucs4_t buffer[MAX_PHRASE_LENGTH];
item.get_phrase_string(buffer);
g_array_append_vals(unichars, buffer, len);
/* probe merge sequence. */
gint len = calculate_sequence_length(tokens);
while (len >= MAX_PHRASE_LENGTH) {
merge_sequence(phrase_table, phrase_index, unichars, tokens);
pop_first_token(unichars, tokens, output);
len = calculate_sequence_length(tokens);
}
return true;
}
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