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#include <algorithm>
#include <library/cpp/charset/wide.h>
#include <util/memory/tempbuf.h>
#include <util/string/vector.h>
#include <util/generic/yexception.h>
#include <util/digest/murmur.h>
#include <util/string/split.h>
#include "stopwords.h"
const EStickySide DefaultStickiness = STICK_RIGHT;
const TWordFilter TWordFilter::EmptyFilter;
struct TToLower {
wchar16 operator()(wchar16 c) {
return (wchar16)ToLower(c);
}
};
size_t TTCharStrIHashImpl(const wchar16* ptr) {
const size_t len = ptr ? std::char_traits<wchar16>::length(ptr) : 0;
TCharTemp buf(len);
std::transform(ptr, ptr + len, buf.Data(), TToLower());
return MurmurHash<size_t>((void*)buf.Data(), len * sizeof(wchar16));
}
bool TTCharStrIEqualToImpl(const wchar16* s1, const wchar16* s2) {
if (!s1 || !s2)
return !s1 == !s2;
for (; *s1 && *s2; ++s1, ++s2)
if (ToLower(*s1) != ToLower(*s2))
return false;
return *s1 == *s2;
}
namespace {
struct TReaderImpl: public TWordListReader {
TWordFilter::TWideStopWordsHash* Res;
ELanguage CurrentLanguage;
EStickySide CurrentStickiness;
TReaderImpl(TWordFilter::TWideStopWordsHash* res)
: Res(res)
, CurrentLanguage(LANG_UNK)
, CurrentStickiness(DefaultStickiness)
{
}
void ParseLine(const TUtf16String& line, ELanguage langcode, int version) override;
void ReadDataFile(const char* s) {
TWordListReader::ReadDataFile(s);
}
void ReadDataFile(IInputStream& in) {
TWordListReader::ReadDataFile(in);
}
};
}
bool TWordFilter::InitStopWordsList(const char* filename) {
if (!filename || !*filename)
return true;
TBuffered<TUnbufferedFileInput> src(4096, filename);
return InitStopWordsList(src);
}
bool TWordFilter::InitStopWordsList(IInputStream& instream) {
TermStopWordsList();
WordFilter.Reset(new TStopWordsHash);
WideWordFilter.Reset(new TWideStopWordsHash);
PlainWordFilter.Reset(new HashSet);
TReaderImpl reader(WideWordFilter.Get());
reader.ReadDataFile(instream);
InitNarrowFilter();
return true;
}
// Deprecated initializer - no language data, default stickiness
bool TWordFilter::InitStopWordsList(const char** s, size_t n) {
TermStopWordsList();
if (!s)
return false;
WordFilter.Reset(new TStopWordsHash);
WideWordFilter.Reset(new TWideStopWordsHash);
PlainWordFilter.Reset(new HashSet);
for (size_t i = 0; i < n; i++) {
if (s[i])
WordFilter->Add(s[i], TStopWordInfo(LI_ALL_LANGUAGES, DefaultStickiness));
}
InitWideFilter();
return true;
}
void TWordFilter::InitWideFilter() {
for (TStopWordsHash::const_iterator it = WordFilter->begin(); it != WordFilter->end(); ++it) {
TUtf16String tmp = UTF8ToWide(it->first);
PlainWordFilter->Add(WideToChar(tmp.data(), tmp.size(), CODES_YANDEX).c_str());
WideWordFilter->insert_copy(tmp.c_str(), tmp.size() + 1, it->second);
}
}
void TWordFilter::InitNarrowFilter() {
TString tmp;
for (TWideStopWordsHash::const_iterator it = WideWordFilter->begin(); it != WideWordFilter->end(); ++it) {
const wchar16* const str = it->first;
const size_t len = std::char_traits<wchar16>::length(str);
tmp.resize(len);
WideToChar(str, len, tmp.begin(), CODES_YANDEX);
PlainWordFilter->Add(tmp.c_str());
WordFilter->Add(WideToUTF8(it->first).c_str(), it->second);
}
}
void TReaderImpl::ParseLine(const TUtf16String& line, ELanguage langcode, int version) {
static const TUtf16String delimiters = u" \t\r\n,;";
static const TUtf16String strNone = u"NONE:";
static const TUtf16String strLeft = u"LEFT:";
static const TUtf16String strRight = u"RIGHT:";
static const TUtf16String strBoth = u"BOTH:";
if (langcode != CurrentLanguage) {
CurrentStickiness = DefaultStickiness; // reset stickiness at the beginning of each zone
CurrentLanguage = langcode;
}
TLangMask langCode = langcode != LANG_UNK ? TLangMask(langcode) : LI_ALL_LANGUAGES;
TVector<TUtf16String> tokens;
StringSplitter(line).SplitBySet(delimiters.c_str()).SkipEmpty().Collect(&tokens);
TVector<TUtf16String>::const_iterator it;
for (it = tokens.begin(); it != tokens.end(); it++) {
if (it->empty())
continue; // due diligence
if (version > 1) { // support for stickiness comes from version 2
if (*it == strNone) {
CurrentStickiness = STICK_NONE;
continue;
} else if (*it == strLeft) {
CurrentStickiness = STICK_LEFT;
continue;
} else if (*it == strRight) {
CurrentStickiness = STICK_RIGHT;
continue;
} else if (*it == strBoth) {
CurrentStickiness = STICK_BOTH;
continue;
}
}
TWordFilter::TWideStopWordsHash::iterator fit = Res->find(it->c_str());
if (fit == Res->end())
Res->insert_copy(it->c_str(), it->length() + 1, TWordFilter::TStopWordInfo(langCode, CurrentStickiness));
else
fit->second.Language.SafeSet(langcode);
}
}
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