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/*
* libpinyin
* Library to deal with pinyin.
*
* Copyright (C) 2017 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 "phonetic_lookup.h"
namespace pinyin{
/* internal definition */
static const size_t nbeam = 32;
bool dump_max_value(GPtrArray * values){
if (0 == values->len)
return false;
const trellis_value_t * max =
(const trellis_value_t *) g_ptr_array_index(values, 0);
for (size_t i = 1; i < values->len; ++i) {
const trellis_value_t * cur =
(const trellis_value_t *) g_ptr_array_index(values, i);
if (cur->m_poss > max->m_poss)
max = cur;
}
printf("max value: %f\n", max->m_poss);
return true;
}
bool dump_all_values(GPtrArray * values) {
if (0 == values->len)
return false;
printf("values:");
for (size_t i = 0; i < values->len; ++i) {
const trellis_value_t * cur =
(const trellis_value_t *) g_ptr_array_index(values, i);
printf("%f\t", cur->m_poss);
}
printf("\n");
return true;
}
static bool trellis_value_less_than(trellis_value_t * lhs,
trellis_value_t * rhs){
return lhs->m_poss < rhs->m_poss;
}
/* use maximum heap to get the topest results. */
static bool get_top_results(/* out */ GPtrArray * topresults,
/* in */ GPtrArray * candidates) {
g_ptr_array_set_size(topresults, 0);
if (0 == candidates->len)
return false;
trellis_value_t ** begin =
(trellis_value_t **) &g_ptr_array_index(candidates, 0);
trellis_value_t ** end =
(trellis_value_t **) &g_ptr_array_index(candidates, candidates->len);
std_lite::make_heap(begin, end, trellis_value_less_than);
while (end != begin) {
trellis_value_t * one = *begin;
g_ptr_array_add(topresults, one);
std_lite::pop_heap(begin, end, trellis_value_less_than);
--end;
if (topresults->len >= nbeam)
break;
}
/* dump_all_values(topresults); */
return true;
}
int ForwardPhoneticConstraints::add_constraint(size_t start, size_t end,
phrase_token_t token) {
if (end > m_constraints->len)
return 0;
for (size_t i = start; i < end; ++i){
clear_constraint(i);
}
/* store one step constraint */
trellis_constraint_t * constraint = &g_array_index
(m_constraints, trellis_constraint_t, start);
constraint->m_type = CONSTRAINT_ONESTEP;
constraint->m_token = token;
constraint->m_constraint_step = end;
/* propagate no search constraint */
for (size_t i = start + 1; i < end; ++i){
constraint = &g_array_index(m_constraints, trellis_constraint_t, i);
constraint->m_type = CONSTRAINT_NOSEARCH;
constraint->m_constraint_step = start;
}
return end - start;
}
bool ForwardPhoneticConstraints::clear_constraint(size_t index) {
if (index < 0 || index >= m_constraints->len)
return false;
trellis_constraint_t * constraint = &g_array_index
(m_constraints, trellis_constraint_t, index);
if (NO_CONSTRAINT == constraint->m_type)
return false;
if (CONSTRAINT_NOSEARCH == constraint->m_type){
index = constraint->m_constraint_step;
constraint = &g_array_index(m_constraints, trellis_constraint_t, index);
}
/* now var constraint points to the one step constraint. */
assert(constraint->m_type == CONSTRAINT_ONESTEP);
/* phrase_token_t token = constraint->m_token; */
size_t end = constraint->m_constraint_step;
for (size_t i = index; i < end; ++i){
if (i >= m_constraints->len)
continue;
constraint = &g_array_index
(m_constraints, trellis_constraint_t, i);
constraint->m_type = NO_CONSTRAINT;
}
return true;
}
bool ForwardPhoneticConstraints::validate_constraint(PhoneticKeyMatrix * matrix) {
/* resize m_constraints array first */
const size_t oldlength = m_constraints->len;
const size_t newlength = matrix->size();
if ( newlength > oldlength ){
g_array_set_size(m_constraints, newlength);
/* initialize new element */
for( size_t i = oldlength; i < newlength; ++i){
trellis_constraint_t * constraint = &g_array_index
(m_constraints, trellis_constraint_t, i);
constraint->m_type = NO_CONSTRAINT;
}
}else if (newlength < oldlength ){
/* just shrink it */
g_array_set_size(m_constraints, newlength);
}
GArray * keys = g_array_new(TRUE, TRUE, sizeof(ChewingKey));
PhraseItem item;
for (size_t i = 0; i < m_constraints->len; ++i){
trellis_constraint_t * constraint = &g_array_index
(m_constraints, trellis_constraint_t, i);
/* handle one step constraint */
if ( constraint->m_type == CONSTRAINT_ONESTEP ){
phrase_token_t token = constraint->m_token;
m_phrase_index->get_phrase_item(token, item);
guint32 end = constraint->m_constraint_step;
/* clear too long constraint */
if (end >= m_constraints->len){
clear_constraint(i);
continue;
}
gfloat pinyin_poss = compute_pronunciation_possibility
(matrix, i, end, keys, item);
/* clear invalid pinyin */
if (pinyin_poss < FLT_EPSILON)
clear_constraint(i);
}
}
g_array_free(keys, TRUE);
return true;
}
};
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