#include "ngram-mod.h"
#include <algorithm>
//
// common_ngram_mod
//
common_ngram_mod::common_ngram_mod(uint16_t n, size_t size) : n(n), used(0) {
entries.resize(size);
reset();
}
size_t common_ngram_mod::idx(const entry_t * tokens) const {
size_t res = 0;
for (size_t i = 0; i < n; ++i) {
res = res*6364136223846793005ULL + tokens[i];
}
res = res % entries.size();
return res;
}
void common_ngram_mod::add(const entry_t * tokens) {
const size_t i = idx(tokens);
if (entries[i] == EMPTY) {
used++;
}
entries[i] = tokens[n];
}
common_ngram_mod::entry_t common_ngram_mod::get(const entry_t * tokens) const {
const size_t i = idx(tokens);
return entries[i];
}
void common_ngram_mod::reset() {
std::fill(entries.begin(), entries.end(), EMPTY);
used = 0;
}
size_t common_ngram_mod::get_n() const {
return n;
}
size_t common_ngram_mod::get_used() const {
return used;
}
size_t common_ngram_mod::size() const {
return entries.size();
}
size_t common_ngram_mod::size_bytes() const {
return entries.size() * sizeof(entries[0]);
}