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/*
* libpinyin
* Library to deal with pinyin.
*
* Copyright (C) 2024 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "punct_table.h"
using namespace pinyin;
PunctTableEntry::PunctTableEntry() {
m_ucs4_cache = g_array_new(TRUE, TRUE, sizeof(ucs4_t));
m_utf8_cache = g_string_new(NULL);
}
PunctTableEntry::~PunctTableEntry() {
g_array_free(m_ucs4_cache, TRUE);
m_ucs4_cache = NULL;
g_string_free(m_utf8_cache, TRUE);
m_utf8_cache = NULL;
}
bool PunctTableEntry::escape(const gchar * punct, gint maxlen = -1) {
if (maxlen == -1)
maxlen = G_MAXINT;
g_array_set_size(m_ucs4_cache, 0);
glong ucs4_len = 0;
gunichar * ucs4_str = g_utf8_to_ucs4(punct, maxlen, NULL, &ucs4_len, NULL);
for(int i = 0; i < ucs4_len; ++i) {
g_array_append_val(m_ucs4_cache, ucs4_str[i]);
if (i < ucs4_len - 1)
g_array_append_val(m_ucs4_cache, ucs4_str[i]);
}
g_free(ucs4_str);
return true;
}
int PunctTableEntry::unescape(const ucs4_t * punct, gint maxlen = -1) {
if (maxlen == -1)
maxlen = G_MAXINT;
g_string_set_size(m_utf8_cache, 0);
int index = 0;
while (index < maxlen) {
g_string_append_unichar(m_utf8_cache, punct[index]);
index++;
if (index >= maxlen)
break;
if (punct[index - 1] == punct[index])
index++;
else
break;
}
return index;
}
bool PunctTableEntry::get_all_punctuations(gchar ** & puncts) {
assert(puncts == NULL);
size_t size = m_chunk.size();
if (size == 0)
return false;
GPtrArray * array = g_ptr_array_new();
ucs4_t * begin = (ucs4_t *) m_chunk.begin();
ucs4_t * end = (ucs4_t *) m_chunk.end();
while (begin < end) {
int len = unescape(begin, end - begin);
g_ptr_array_add(array, g_strdup(m_utf8_cache->str));
begin += len;
}
g_ptr_array_add(array, NULL);
/* must be freed by g_strfreev. */
puncts = (gchar **) g_ptr_array_free(array, FALSE);
return true;
}
bool PunctTableEntry::append_punctuation(const gchar * punct) {
gchar ** puncts = NULL;
get_all_punctuations(puncts);
if (puncts && g_strv_contains(puncts, punct))
abort();
g_strfreev(puncts);
if (!escape(punct))
return false;
m_chunk.append_content
(m_ucs4_cache->data, m_ucs4_cache->len * sizeof(ucs4_t));
return true;
}
bool PunctTableEntry::remove_punctuation(const gchar * punct) {
if (m_chunk.size() == 0)
return false;
if (!escape(punct))
return false;
ucs4_t * begin = (ucs4_t *) m_chunk.begin();
ucs4_t * end = (ucs4_t *) m_chunk.end();
int index = 0;
int len = m_ucs4_cache->len;
while (begin + index + len <= end) {
/* match the punctuation */
if (0 == memcmp(begin + index, m_ucs4_cache->data,
len * sizeof(ucs4_t))) {
m_chunk.remove_content
(index * sizeof(ucs4_t),
len * sizeof(ucs4_t));
return true;
}
/* check the next punctuation index */
index++;
while (begin + index < end) {
if (begin[index - 1] == begin[index])
index += 2;
else
break;
}
}
return false;
}
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