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/**
* Copyright (C) 2015 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/fts/unicode/string.h"
#include <algorithm>
#include "mongo/shell/linenoise_utf8.h"
#include "mongo/util/assert_util.h"
namespace mongo {
namespace unicode {
using linenoise_utf8::copyString32to8;
using linenoise_utf8::copyString8to32;
using std::u32string;
String::String(const StringData utf8_src) {
// Reserve space for underlying buffers to prevent excessive reallocations.
_outputBuf.reserve(utf8_src.size() * 4);
_data.reserve(utf8_src.size() * 4);
// Convert UTF-8 input to UTF-32 data.
setData(utf8_src);
}
void String::resetData(const StringData utf8_src) {
// Convert UTF-8 input to UTF-32 data.
setData(utf8_src);
}
void String::setData(const StringData utf8_src) {
// _data is the target, resize it so that it's guaranteed to fit all of the input characters,
// plus a null character if there isn't one.
_data.resize(utf8_src.size() + 1);
int result = 0;
size_t resultSize = 0;
// Although utf8_src.rawData() is not guaranteed to be null-terminated, copyString8to32 won't
// access bad memory because it is limited by the size of its output buffer, which is set to the
// size of utf8_src.
copyString8to32(&_data[0],
reinterpret_cast<const unsigned char*>(&utf8_src.rawData()[0]),
_data.size(),
resultSize,
result);
uassert(28755, "text contains invalid UTF-8", result == 0);
// Resize _data so it is only as big as what it contains.
_data.resize(resultSize);
_needsOutputConversion = true;
}
String::String(u32string&& src) : _data(std::move(src)), _needsOutputConversion(true) {
// Reserve space for underlying buffers to prevent excessive reallocations.
_outputBuf.reserve(src.size() * 4);
_data.reserve(src.size() * 4);
}
std::string String::toString() {
// _outputBuf is the target, resize it so that it's guaranteed to fit all of the input
// characters, plus a null character if there isn't one.
if (_needsOutputConversion) {
_outputBuf.resize(_data.size() * 4 + 1);
size_t resultSize = copyString32to8(
reinterpret_cast<unsigned char*>(&_outputBuf[0]), &_data[0], _outputBuf.size());
// Resize output so it is only as large as what it contains.
_outputBuf.resize(resultSize);
_needsOutputConversion = false;
}
return _outputBuf;
}
size_t String::size() const {
return _data.size();
}
const char32_t& String::operator[](int i) const {
return _data[i];
}
String String::substr(size_t pos, size_t len) const {
unicode::String buf;
substrToBuf(pos, len, buf);
return buf;
}
String String::toLower(CaseFoldMode mode) const {
unicode::String buf;
toLowerToBuf(mode, buf);
return buf;
}
String String::removeDiacritics() const {
unicode::String buf;
removeDiacriticsToBuf(buf);
return buf;
}
void String::copyToBuf(String& buffer) const {
buffer._data = _data;
buffer._data.resize(_data.size());
auto index = 0;
for (auto codepoint : _data) {
buffer._data[index++] = codepoint;
}
buffer._needsOutputConversion = true;
}
void String::substrToBuf(size_t pos, size_t len, String& buffer) const {
buffer._data.resize(len + 1);
for (size_t index = 0, src_pos = pos; index < len;) {
buffer._data[index++] = _data[src_pos++];
}
buffer._data[len] = '\0';
buffer._needsOutputConversion = true;
}
void String::toLowerToBuf(CaseFoldMode mode, String& buffer) const {
buffer._data.resize(_data.size());
auto index = 0;
for (auto codepoint : _data) {
buffer._data[index++] = codepointToLower(codepoint, mode);
}
buffer._needsOutputConversion = true;
}
void String::removeDiacriticsToBuf(String& buffer) const {
buffer._data.resize(_data.size());
auto index = 0;
for (auto codepoint : _data) {
if (!codepointIsDiacritic(codepoint)) {
buffer._data[index++] = codepointRemoveDiacritics(codepoint);
}
}
buffer._data.resize(index);
buffer._needsOutputConversion = true;
}
bool String::substrMatch(const String& str,
const String& find,
SubstrMatchOptions options,
CaseFoldMode cfMode) {
// In Turkish, lowercasing needs to be applied first because the letter İ has a different case
// folding mapping than the letter I, but removing diacritics removes the dot from İ.
if (cfMode == CaseFoldMode::kTurkish) {
String cleanStr = str.toLower(cfMode);
String cleanFind = find.toLower(cfMode);
return substrMatch(cleanStr, cleanFind, options | kCaseSensitive, CaseFoldMode::kNormal);
}
if (options & kDiacriticSensitive) {
if (options & kCaseSensitive) {
// Case sensitive and diacritic sensitive.
return std::search(str._data.cbegin(),
str._data.cend(),
find._data.cbegin(),
find._data.cend(),
[&](char32_t c1, char32_t c2) { return (c1 == c2); }) !=
str._data.cend();
}
// Case insensitive and diacritic sensitive.
return std::search(str._data.cbegin(),
str._data.cend(),
find._data.cbegin(),
find._data.cend(),
[&](char32_t c1, char32_t c2) {
return (codepointToLower(c1, cfMode) ==
codepointToLower(c2, cfMode));
}) != str._data.cend();
}
String cleanStr = str.removeDiacritics();
String cleanFind = find.removeDiacritics();
return substrMatch(cleanStr, cleanFind, options | kDiacriticSensitive, cfMode);
}
} // namespace unicode
} // namespace mongo
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