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#include <util/system/maxlen.h>
#include "multitokenutil.h"
namespace {
inline void GlueTokens(TCharSpan* desttok, const TCharSpan* srctok) {
Y_ASSERT(srctok->PrefixLen == 0);
desttok->Len += srctok->Len;
desttok->SuffixLen = srctok->SuffixLen;
desttok->Hyphen = srctok->Hyphen; // the next token can have hyphenation
desttok->TokenDelim = srctok->TokenDelim;
}
inline void CopyToken(TCharSpan* desttok, const TCharSpan* srctok, size_t destpos) {
Y_ASSERT(srctok->PrefixLen == 0);
desttok->Pos = destpos;
desttok->Len = srctok->Len;
desttok->SuffixLen = srctok->SuffixLen;
desttok->Type = srctok->Type;
desttok->Hyphen = srctok->Hyphen; // the next token can have hyphenation
desttok->TokenDelim = srctok->TokenDelim;
}
//! processes hyphenation between subtokens if any
inline void ProcessHyphenation(wchar16* buffer, const wchar16* entry, TCharSpan*& desttok, const TCharSpan* srctok, size_t& destpos, size_t& srcpos) {
// Check if the space contains hyphenation, and copy the separator
if (desttok->Hyphen == HYPHEN_ORDINARY) {
if (desttok->Type == TOKEN_WORD && srctok->Type == TOKEN_WORD) {
// glue two adjacent tokens if both are TOKEN_WORD
srcpos = srctok->Pos;
GlueTokens(desttok, srctok);
} else {
// copy delimiter only - remove all following whitespace characters, for example: "sepa- \n rator" (see nlptok.rl, hyphenation/nlfasblank)
wchar16* const dest = buffer + destpos;
const wchar16* const src = entry + srcpos; // srcpos - the beginning of source delimiter
*dest = *src;
desttok->TokenDelim = TOKDELIM_MINUS;
++destpos;
srcpos = srctok->Pos; // keep it before CopyToken()
CopyToken(++desttok, srctok, destpos);
}
} else if (desttok->Hyphen == HYPHEN_SOFT) {
if (desttok->Type == srctok->Type) {
// glue two adjacent tokens if both have the same type
srcpos = srctok->Pos;
GlueTokens(desttok, srctok);
} else {
// delimiter isn't copied
srcpos = srctok->Pos; // keep it before CopyToken()
CopyToken(++desttok, srctok, destpos);
}
} else {
Y_ASSERT(desttok->Hyphen == HYPHEN_NONE); // HYPHEN_HARD isn't processed yet
Y_ASSERT(srctok->Pos >= srcpos);
if (srctok->Pos > srcpos) {
// copy the delimiter and create the next token
const size_t seplen = srctok->Pos - srcpos; // srcpos - the beginning of source delimiter
// copy suffix with delimiter
std::char_traits<wchar16>::copy(buffer + destpos, entry + srcpos, seplen);
destpos += seplen;
srcpos = srctok->Pos; // keep it before CopyToken()
}
CopyToken(++desttok, srctok, destpos);
}
}
//! @param len length of text to be copied (it can include suffix length)
inline void CopyTokenText(wchar16* buffer, const wchar16* entry, size_t len, size_t& destpos, size_t& srcpos) {
std::char_traits<wchar16>::copy(buffer + destpos, entry + srcpos, len); // srcpos - the beginning of source token
srcpos += len;
destpos += len;
}
inline bool CutSubtoken(TCharSpan& s, size_t maxLen) {
if (s.EndPos() > maxLen) {
s.Len = maxLen - s.Pos;
s.SuffixLen = 0;
return true;
} else if (s.EndPos() + s.SuffixLen > maxLen) {
s.SuffixLen = maxLen - s.EndPos();
return true;
}
return false;
}
}
void CorrectDelimiters(TCharSpan& prevtok, wchar16 suffixChar, TCharSpan& lasttok, wchar16 prefixChar) {
// correct suffix length of the previous token
switch (lasttok.Pos - prevtok.EndPos()) {
case 0:
Y_ASSERT(prevtok.SuffixLen == 0 && prevtok.TokenDelim == TOKDELIM_NULL && lasttok.PrefixLen == 0);
break;
case 1: // only delimiter allowed
if (prevtok.SuffixLen == 1 && prevtok.TokenDelim == TOKDELIM_PLUS) // 'a+b'
prevtok.SuffixLen = 0;
Y_ASSERT(
(prevtok.SuffixLen == 0 && prevtok.TokenDelim != TOKDELIM_NULL && lasttok.PrefixLen == 0) ||
(prevtok.SuffixLen == 0 && prevtok.TokenDelim == TOKDELIM_NULL && lasttok.PrefixLen == 0 && prevtok.Hyphen == HYPHEN_SOFT));
break;
case 2: // only suffix + delimiter OR delimiter + prefix
if (prevtok.SuffixLen == 1 && lasttok.PrefixLen == 1) { // 'a+@b' - delim/prefix, 'a#@b' - suffix/delim
if (suffixChar == '+') {
prevtok.SuffixLen = 0;
prevtok.TokenDelim = TOKDELIM_PLUS;
} else if (suffixChar == '#') {
Y_ASSERT(prefixChar == '@'); // only '@' can be delimiter and prefix
prevtok.TokenDelim = TOKDELIM_AT_SIGN;
lasttok.PrefixLen = 0;
}
} else if (prevtok.SuffixLen == 2) {
prevtok.SuffixLen = 1;
prevtok.TokenDelim = TOKDELIM_PLUS; // since SuffixLen == 2 can be '++' only
}
Y_ASSERT(
(prevtok.SuffixLen == 1 && prevtok.TokenDelim != TOKDELIM_NULL && lasttok.PrefixLen == 0) ||
(prevtok.SuffixLen == 0 && prevtok.TokenDelim != TOKDELIM_NULL && lasttok.PrefixLen == 1) ||
(prevtok.SuffixLen == 0 && prevtok.TokenDelim == TOKDELIM_NULL && lasttok.PrefixLen == 0 &&
(prevtok.Hyphen == HYPHEN_ORDINARY || prevtok.Hyphen == HYPHEN_SOFT)));
break;
case 3:
if (prevtok.SuffixLen == 2 && lasttok.PrefixLen == 1) { // a++/b
if (prevtok.TokenDelim == TOKDELIM_PLUS) // a++/b
prevtok.SuffixLen = 1;
else if (prevtok.TokenDelim == TOKDELIM_AT_SIGN) { // 'a++@b'
prevtok.SuffixLen = 1;
prevtok.TokenDelim = TOKDELIM_PLUS;
}
}
Y_ASSERT(
(prevtok.SuffixLen == 1 && prevtok.TokenDelim != TOKDELIM_NULL && lasttok.PrefixLen == 1) ||
(prevtok.SuffixLen == 2 && prevtok.TokenDelim != TOKDELIM_NULL && lasttok.PrefixLen == 0) ||
(prevtok.SuffixLen == 0 && prevtok.TokenDelim == TOKDELIM_NULL && lasttok.PrefixLen == 0 &&
(prevtok.Hyphen == HYPHEN_ORDINARY || prevtok.Hyphen == HYPHEN_SOFT)));
break;
case 4:
Y_ASSERT(
(prevtok.SuffixLen == 2 && prevtok.TokenDelim != TOKDELIM_NULL && lasttok.PrefixLen == 1) ||
(prevtok.SuffixLen == 0 && prevtok.TokenDelim == TOKDELIM_NULL && lasttok.PrefixLen == 0 &&
(prevtok.Hyphen == HYPHEN_ORDINARY || prevtok.Hyphen == HYPHEN_SOFT)));
break;
default:
Y_ASSERT(
prevtok.SuffixLen == 0 && prevtok.TokenDelim == TOKDELIM_NULL && lasttok.PrefixLen == 0 &&
(prevtok.Hyphen == HYPHEN_ORDINARY || prevtok.Hyphen == HYPHEN_SOFT));
break;
}
}
NLP_TYPE PrepareMultitoken(TTokenStructure& subtokens, wchar16* buffer, size_t buflen, const wchar16* entry, size_t& len) {
size_t srcpos = subtokens[0].EndPos(); // the beginning of source delimiters and tokens
if (srcpos > buflen - 1) {
srcpos = buflen - 1;
subtokens[0].Len = srcpos - subtokens[0].Pos;
}
size_t destpos = srcpos;
std::char_traits<wchar16>::copy(buffer, entry, srcpos);
TCharSpan* const firsttok = &subtokens[0];
TCharSpan* const lasttok = firsttok + subtokens.size();
TCharSpan* desttok = firsttok;
// lengths of tokens are not changed, tokens can be moved only to remove delimiters
for (const TCharSpan* srctok = firsttok + 1; srctok != lasttok; ++srctok) {
// Check available space; truncate input if not sufficient
if (srctok->EndPos() >= buflen) {
break;
}
if (srctok->EndPos() + srctok->SuffixLen >= buflen) {
ProcessHyphenation(buffer, entry, desttok, srctok, destpos, srcpos);
if (desttok->EndPos() + desttok->SuffixLen >= buflen) {
Y_ASSERT(desttok->EndPos() < buflen);
desttok->SuffixLen = 0; // cut off the suffix
CopyTokenText(buffer, entry, srctok->Len, destpos, srcpos); // copy with no suffix
} else
CopyTokenText(buffer, entry, (srctok->Len + srctok->SuffixLen), destpos, srcpos); // copy the token with suffix
break;
}
ProcessHyphenation(buffer, entry, desttok, srctok, destpos, srcpos);
CopyTokenText(buffer, entry, (srctok->Len + srctok->SuffixLen), destpos, srcpos); // copy the token with suffix
}
Y_ASSERT(srcpos >= destpos);
// Multitoken->Leng
len = destpos;
subtokens.resize(desttok - firsttok + 1);
subtokens.back().TokenDelim = TOKDELIM_NULL;
return DetectNLPType(subtokens); // after PrepareMultitoken nlpType can be chagned
}
size_t AdjustSubtokens(TTokenStructure& subtokens, size_t maxLen) {
Y_ASSERT(!subtokens.empty());
TCharSpan* const first = &subtokens[0];
TCharSpan* p = first + subtokens.size() - 1;
while (p != first && p->Pos >= maxLen) {
--p;
}
CutSubtoken(*p, maxLen);
subtokens.resize(p - first + 1);
p->TokenDelim = TOKDELIM_NULL;
return p->EndPos() + p->SuffixLen;
}
size_t AdjustSubtokens(TTokenStructure& subtokens, size_t n, size_t maxLen) {
Y_ASSERT(n > 0);
Y_ASSERT(!subtokens.empty());
// ````````````````ab``-cd```-ef```
// ---------0---------- --1-- --2--
// ^n
TCharSpan& first = subtokens[0];
Y_ASSERT(first.Len > n);
first.Pos = 0;
first.Len -= n;
if (CutSubtoken(first, maxLen)) {
subtokens.resize(1);
} else {
for (size_t i = 1; i < subtokens.size(); ++i) {
TCharSpan& span = subtokens[i];
Y_ASSERT(span.Pos > n);
const size_t newPos = span.Pos - n;
if (newPos >= maxLen) { // if no symbols left for current token - finish
subtokens.resize(i);
break;
}
span.Pos = newPos;
if (CutSubtoken(span, maxLen)) {
subtokens.resize(i + 1);
break;
}
}
}
TCharSpan& last = subtokens.back();
last.TokenDelim = TOKDELIM_NULL;
return last.EndPos() + last.SuffixLen;
}
bool CheckMultitoken(const TWideToken& tok) {
const TTokenStructure& subtokens = tok.SubTokens;
for (size_t i = 0; i < subtokens.size(); ++i) {
const TCharSpan& s = subtokens[i];
if (!s.Len)
Y_ASSERT(false);
if (i > 0) {
const TCharSpan& prev = subtokens[i - 1];
if (prev.EndPos() + prev.SuffixLen > s.Pos - s.PrefixLen)
Y_ASSERT(false);
else if (prev.EndPos() + prev.SuffixLen == s.Pos - s.PrefixLen && prev.TokenDelim != TOKDELIM_NULL)
Y_ASSERT(false);
}
if (i + 1 < subtokens.size()) {
const TCharSpan& next = subtokens[i + 1];
if (s.EndPos() + s.SuffixLen > next.Pos - next.PrefixLen)
Y_ASSERT(false);
else if (s.EndPos() + s.SuffixLen == next.Pos - next.PrefixLen && s.TokenDelim != TOKDELIM_NULL)
Y_ASSERT(false);
} else {
if (s.EndPos() + s.SuffixLen != tok.Leng || s.TokenDelim != TOKDELIM_NULL)
Y_ASSERT(false);
}
}
return (subtokens.empty() || tok.Leng == (subtokens.back().EndPos() + subtokens.back().SuffixLen));
}
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