Hawkin
/
arangodb
mirror of https://gitee.com/bigwinds/arangodb
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Replaced the word tokenizer TRI_string_vector_t version by a std::vector<std::string> version

This commit is contained in:
Michael Hackstein 2016-03-01 13:39:17 +01:00
parent fa8b4ae0e3
commit d3a53cd9bf
2 changed files with 22 additions and 215 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

207
lib/Basics/Utf8Helper.cpp
View File

@ -387,22 +387,20 @@ char* Utf8Helper::toupper(TRI_memory_zone_t* zone, char const* src,
/// @brief Extract the words from a UTF-8 string.
////////////////////////////////////////////////////////////////////////////////
TRI_vector_string_t* Utf8Helper::getWords(char const* text, size_t textLength,
size_t minimalLength,
size_t maximalLength,
bool lowerCase) {
TRI_vector_string_t* words;
bool Utf8Helper::getWords(std::vector<std::string>& words,
std::string const& text, size_t minimalLength,
size_t maximalLength, bool lowerCase) {
UErrorCode status = U_ZERO_ERROR;
UnicodeString word;
if (textLength == 0) {
// input text is empty
return nullptr;
if (text.empty()) {
return true;
}
size_t textLength = text.size();
if (textLength < minimalLength) {
// input text is shorter than required minimum length
return nullptr;
return true;
}
size_t textUtf16Length = 0;
@ -412,28 +410,28 @@ TRI_vector_string_t* Utf8Helper::getWords(char const* text, size_t textLength,
// lower case string
int32_t lowerLength = 0;
char* lower =
tolower(TRI_UNKNOWN_MEM_ZONE, text, (int32_t)textLength, lowerLength);
tolower(TRI_UNKNOWN_MEM_ZONE, text.c_str(), (int32_t)textLength, lowerLength);
if (lower == nullptr) {
// out of memory
return nullptr;
return false;
}
if (lowerLength == 0) {
TRI_Free(TRI_UNKNOWN_MEM_ZONE, lower);
return nullptr;
return false;
}
textUtf16 = TRI_Utf8ToUChar(TRI_UNKNOWN_MEM_ZONE, lower, lowerLength,
&textUtf16Length);
TRI_Free(TRI_UNKNOWN_MEM_ZONE, lower);
} else {
textUtf16 = TRI_Utf8ToUChar(TRI_UNKNOWN_MEM_ZONE, text, (int32_t)textLength,
textUtf16 = TRI_Utf8ToUChar(TRI_UNKNOWN_MEM_ZONE, text.c_str(), (int32_t)textLength,
&textUtf16Length);
}
if (textUtf16 == nullptr) {
return nullptr;
return false;
}
ULocDataLocaleType type = ULOC_VALID_LOCALE;
@ -442,7 +440,7 @@ TRI_vector_string_t* Utf8Helper::getWords(char const* text, size_t textLength,
if (U_FAILURE(status)) {
TRI_Free(TRI_UNKNOWN_MEM_ZONE, textUtf16);
LOG(ERR) << "error in Collator::getLocale(...): " << u_errorName(status);
return nullptr;
return false;
}
UChar* tempUtf16 = (UChar*)TRI_Allocate(
@ -450,16 +448,7 @@ TRI_vector_string_t* Utf8Helper::getWords(char const* text, size_t textLength,
if (tempUtf16 == nullptr) {
TRI_Free(TRI_UNKNOWN_MEM_ZONE, textUtf16);
return nullptr;
}
words = (TRI_vector_string_t*)TRI_Allocate(
TRI_UNKNOWN_MEM_ZONE, sizeof(TRI_vector_string_t), false);
if (words == nullptr) {
TRI_Free(TRI_UNKNOWN_MEM_ZONE, textUtf16);
TRI_Free(TRI_UNKNOWN_MEM_ZONE, tempUtf16);
return nullptr;
return false;
}
// estimate an initial vector size. this is not accurate, but setting the
@ -474,8 +463,8 @@ TRI_vector_string_t* Utf8Helper::getWords(char const* text, size_t textLength,
// alloc at most 8192 pointers (= 64kb)
initialWordCount = 8192;
}
TRI_InitVectorString2(words, TRI_UNKNOWN_MEM_ZONE, initialWordCount);
// Reserve initialWordCount additional words in the vector
words.reserve(words.size() + initialWordCount);
BreakIterator* wordIterator =
BreakIterator::createWordInstance(locale, status);
@ -498,145 +487,9 @@ TRI_vector_string_t* Utf8Helper::getWords(char const* text, size_t textLength,
char* utf8Word = TRI_UCharToUtf8(TRI_UNKNOWN_MEM_ZONE, tempUtf16,
chunkLength, &utf8WordLength);
if (utf8Word != nullptr) {
TRI_PushBackVectorString(words, utf8Word);
}
}
}
delete wordIterator;
TRI_Free(TRI_UNKNOWN_MEM_ZONE, textUtf16);
TRI_Free(TRI_UNKNOWN_MEM_ZONE, tempUtf16);
if (words->_length == 0) {
// no words found
TRI_FreeVectorString(TRI_UNKNOWN_MEM_ZONE, words);
return nullptr;
}
return words;
}
////////////////////////////////////////////////////////////////////////////////
/// @brief Extract the words from a UTF-8 string.
////////////////////////////////////////////////////////////////////////////////
bool Utf8Helper::getWords(TRI_vector_string_t*& words, char const* text,
size_t textLength, size_t minimalLength,
size_t maximalLength, bool lowerCase) {
UErrorCode status = U_ZERO_ERROR;
UnicodeString word;
if (textLength == 0) {
// input text is empty
return true;
}
if (textLength < minimalLength) {
// input text is shorter than required minimum length
return true;
}
size_t textUtf16Length = 0;
UChar* textUtf16 = nullptr;
if (lowerCase) {
// lower case string
int32_t lowerLength = 0;
char* lower =
tolower(TRI_UNKNOWN_MEM_ZONE, text, (int32_t)textLength, lowerLength);
if (lower == nullptr) {
// out of memory
return false;
}
if (lowerLength == 0) {
TRI_Free(TRI_UNKNOWN_MEM_ZONE, lower);
return false;
}
textUtf16 = TRI_Utf8ToUChar(TRI_UNKNOWN_MEM_ZONE, lower, lowerLength,
&textUtf16Length);
TRI_Free(TRI_UNKNOWN_MEM_ZONE, lower);
} else {
textUtf16 = TRI_Utf8ToUChar(TRI_UNKNOWN_MEM_ZONE, text, (int32_t)textLength,
&textUtf16Length);
}
if (textUtf16 == nullptr) {
return false;
}
ULocDataLocaleType type = ULOC_VALID_LOCALE;
const Locale& locale = _coll->getLocale(type, status);
if (U_FAILURE(status)) {
TRI_Free(TRI_UNKNOWN_MEM_ZONE, textUtf16);
LOG(ERR) << "error in Collator::getLocale(...): " << u_errorName(status);
return false;
}
UChar* tempUtf16 = (UChar*)TRI_Allocate(
TRI_UNKNOWN_MEM_ZONE, (textUtf16Length + 1) * sizeof(UChar), false);
if (tempUtf16 == nullptr) {
TRI_Free(TRI_UNKNOWN_MEM_ZONE, textUtf16);
return false;
}
bool created = false;
if (words == nullptr) {
words = (TRI_vector_string_t*)TRI_Allocate(
TRI_UNKNOWN_MEM_ZONE, sizeof(TRI_vector_string_t), false);
created = true;
}
if (words == nullptr) {
TRI_Free(TRI_UNKNOWN_MEM_ZONE, textUtf16);
TRI_Free(TRI_UNKNOWN_MEM_ZONE, tempUtf16);
return false;
}
if (created) {
// estimate an initial vector size. this is not accurate, but setting the
// initial size to some
// value in the correct order of magnitude will save a lot of vector
// reallocations later
size_t initialWordCount = textLength / (2 * (minimalLength + 1));
if (initialWordCount < 32) {
// alloc at least 32 pointers (= 256b)
initialWordCount = 32;
} else if (initialWordCount > 8192) {
// alloc at most 8192 pointers (= 64kb)
initialWordCount = 8192;
}
TRI_InitVectorString2(words, TRI_UNKNOWN_MEM_ZONE, initialWordCount);
}
BreakIterator* wordIterator =
BreakIterator::createWordInstance(locale, status);
UnicodeString utext(textUtf16);
wordIterator->setText(utext);
int32_t start = wordIterator->first();
for (int32_t end = wordIterator->next(); end != BreakIterator::DONE;
start = end, end = wordIterator->next()) {
size_t tempUtf16Length = (size_t)(end - start);
// end - start = word length
if (tempUtf16Length >= minimalLength) {
size_t chunkLength = tempUtf16Length;
if (chunkLength > maximalLength) {
chunkLength = maximalLength;
}
utext.extractBetween(start, (int32_t)(start + chunkLength), tempUtf16, 0);
size_t utf8WordLength;
char* utf8Word = TRI_UCharToUtf8(TRI_UNKNOWN_MEM_ZONE, tempUtf16,
chunkLength, &utf8WordLength);
if (utf8Word != nullptr) {
TRI_PushBackVectorString(words, utf8Word);
std::string word(utf8Word, utf8WordLength);
words.emplace_back(word);
TRI_Free(TRI_UNKNOWN_MEM_ZONE, utf8Word);
}
}
}
@ -731,28 +584,6 @@ char* TRI_tolower_utf8(TRI_memory_zone_t* zone, char const* src,
*dstLength);
}
////////////////////////////////////////////////////////////////////////////////
/// @brief Get words of an UTF-8 string (implemented in Basic/Utf8Helper.cpp)
////////////////////////////////////////////////////////////////////////////////
TRI_vector_string_t* TRI_get_words(char const* text, size_t textLength,
size_t minimalWordLength,
size_t maximalWordLength, bool lowerCase) {
return Utf8Helper::DefaultUtf8Helper.getWords(
text, textLength, minimalWordLength, maximalWordLength, lowerCase);
}
////////////////////////////////////////////////////////////////////////////////
/// @brief Get words of an UTF-8 string (implemented in Basic/Utf8Helper.cpp)
////////////////////////////////////////////////////////////////////////////////
bool TRI_get_words(TRI_vector_string_t*& words, char const* text,
size_t textLength, size_t minimalWordLength,
size_t maximalWordLength, bool lowerCase) {
return Utf8Helper::DefaultUtf8Helper.getWords(
words, text, textLength, minimalWordLength, maximalWordLength, lowerCase);
}
////////////////////////////////////////////////////////////////////////////////
/// @brief convert a utf-8 string to a uchar (utf-16)
////////////////////////////////////////////////////////////////////////////////

30
lib/Basics/Utf8Helper.h
View File

@ -135,17 +135,9 @@ class Utf8Helper {
/// @brief returns the words of a UTF-8 string.
//////////////////////////////////////////////////////////////////////////////
TRI_vector_string_t* getWords(char const* text, size_t textLength,
size_t minimalWordLength,
size_t maximalWordLength, bool lowerCase);
//////////////////////////////////////////////////////////////////////////////
/// @brief returns the words of a UTF-8 string.
//////////////////////////////////////////////////////////////////////////////
bool getWords(TRI_vector_string_t*& words, char const* text,
size_t textLength, size_t minimalWordLength,
size_t maximalWordLength, bool lowerCase);
bool getWords(std::vector<std::string>& words, std::string const& text,
size_t minimalWordLength, size_t maximalWordLength,
bool lowerCase);
//////////////////////////////////////////////////////////////////////////////
/// @brief builds a regex matcher for the specified pattern
@ -220,20 +212,4 @@ int TRI_compare_utf8(char const* left, size_t leftLength, char const* right,
char* TRI_tolower_utf8(TRI_memory_zone_t* zone, char const* src,
int32_t srcLength, int32_t* dstLength);
////////////////////////////////////////////////////////////////////////////////
/// @brief Get words of an UTF-8 string (implemented in Basic/Utf8Helper.cpp)
////////////////////////////////////////////////////////////////////////////////
TRI_vector_string_t* TRI_get_words(char const* text, size_t textLength,
size_t minimalWordLength,
size_t maximalWordLength, bool lowerCase);
////////////////////////////////////////////////////////////////////////////////
/// @brief Get words of an UTF-8 string (implemented in Basic/Utf8Helper.cpp)
////////////////////////////////////////////////////////////////////////////////
bool TRI_get_words(TRI_vector_string_t*& words, char const* text,
size_t textLength, size_t minimalWordLength,
size_t maximalWordLength, bool lowerCase);
#endif