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#include "solar_codec.h"
#include <library/cpp/codecs/greedy_dict/gd_builder.h>
#include <library/cpp/containers/comptrie/comptrie_builder.h>
#include <library/cpp/string_utils/relaxed_escaper/relaxed_escaper.h>
#include <util/stream/length.h>
#include <util/string/printf.h>
#include <util/ysaveload.h>
namespace NCodecs {
static inline ui32 Append(TBuffer& pool, TStringBuf data) {
pool.Append(data.data(), data.size());
return pool.Size();
}
void TSolarCodec::DoLearn(ISequenceReader& r) {
using namespace NGreedyDict;
const ui32 maxlen = Max<ui32>() / Max<ui32>(MaxEntries, 1);
Decoder.clear();
Pool.Clear();
THolder<TEntrySet> set;
{
TMemoryPool pool(8112, TMemoryPool::TLinearGrow::Instance());
TStringBufs bufs;
TStringBuf m;
while (r.NextRegion(m)) {
bufs.push_back(pool.AppendString(m));
}
{
TDictBuilder b(Settings);
b.SetInput(bufs);
b.Build(MaxEntries, MaxIterations, maxlen);
set = b.ReleaseEntrySet();
}
}
set->SetScores(ES_LEN_COUNT);
{
TVector<std::pair<float, TStringBuf>> tmp;
tmp.reserve(set->size());
for (const auto& it : *set) {
Y_ENSURE(it.Str.size() <= maxlen);
tmp.push_back(std::make_pair(-it.Score, it.Str));
}
Sort(tmp.begin(), tmp.end());
Decoder.reserve(tmp.size() + 1);
Decoder.push_back(0);
for (const auto& it : tmp) {
Y_ENSURE(Decoder.back() == Pool.Size(), "learning invariant failed");
ui32 endoff = Append(Pool, it.second);
Decoder.push_back(endoff);
}
}
Pool.ShrinkToFit();
Decoder.shrink_to_fit();
TBufferOutput bout;
{
TVector<std::pair<TStringBuf, ui32>> tmp2;
tmp2.reserve(Decoder.size());
for (ui32 i = 1, sz = Decoder.size(); i < sz; ++i) {
TStringBuf s = DoDecode(i);
tmp2.push_back(std::make_pair(s, i - 1));
Y_ENSURE(s.size() == (Decoder[i] - Decoder[i - 1]), "learning invariant failed");
}
Sort(tmp2.begin(), tmp2.end());
{
TEncoder::TBuilder builder(CTBF_PREFIX_GROUPED);
for (const auto& it : tmp2) {
builder.Add(it.first.data(), it.first.size(), it.second);
}
builder.Save(bout);
}
}
Encoder.Init(TBlob::FromBuffer(bout.Buffer()));
}
void TSolarCodec::Save(IOutputStream* out) const {
TBlob b = Encoder.Data();
::Save(out, (ui32)b.Size());
out->Write(b.Data(), b.Size());
}
void TSolarCodec::Load(IInputStream* in) {
ui32 sz;
::Load(in, sz);
TLengthLimitedInput lin(in, sz);
Encoder.Init(TBlob::FromStream(lin));
Pool.Clear();
Decoder.clear();
TVector<std::pair<ui32, TString>> tmp;
ui32 poolsz = 0;
for (TEncoder::TConstIterator it = Encoder.Begin(); it != Encoder.End(); ++it) {
const TString& s = it.GetKey();
tmp.push_back(std::make_pair(it.GetValue(), !s ? TString("\0", 1) : s));
poolsz += Max<ui32>(s.size(), 1);
}
Sort(tmp.begin(), tmp.end());
Pool.Reserve(poolsz);
Decoder.reserve(tmp.size() + 1);
Decoder.push_back(0);
for (ui32 i = 0, sz2 = tmp.size(); i < sz2; ++i) {
Y_ENSURE(i == tmp[i].first, "oops! " << i << " " << tmp[i].first);
Decoder.push_back(Append(Pool, tmp[i].second));
}
Pool.ShrinkToFit();
Decoder.shrink_to_fit();
}
}
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