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Copy pathcharsequence.h
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2657 lines (2418 loc) · 76.4 KB
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#pragma once
#include <algorithm>
#include <array>
#include <charconv>
#include <cstddef>
#include <deque>
#include <iostream>
#include <iterator>
#include <limits>
#include <mutex>
#include <sstream>
#include <stdexcept>
#include <string>
#include <string_view>
#include <type_traits>
#include <vector>
namespace charsequence
{
enum class charset
{
ascii,
utf8,
utf16,
utf16be,
utf16le,
utf32,
utf32be,
utf32le,
latin1
};
inline std::ostream &operator<<(std::ostream &stream, charset cs)
{
switch (cs)
{
case charset::ascii:
stream << "ascii";
break;
case charset::utf8:
stream << "utf8";
break;
case charset::utf16:
stream << "utf16";
break;
case charset::utf16be:
stream << "utf16be";
break;
case charset::utf16le:
stream << "utf16le";
break;
case charset::utf32:
stream << "utf32";
break;
case charset::utf32be:
stream << "utf32be";
break;
case charset::utf32le:
stream << "utf32le";
break;
case charset::latin1:
stream << "latin1";
break;
}
return stream;
}
inline std::istream &operator>>(std::istream &stream, charset &cs)
{
std::string token;
stream >> token;
if (token == "ascii")
cs = charset::ascii;
else if (token == "utf8")
cs = charset::utf8;
else if (token == "utf16")
cs = charset::utf16;
else if (token == "utf16be")
cs = charset::utf16be;
else if (token == "utf16le")
cs = charset::utf16le;
else if (token == "utf32")
cs = charset::utf32;
else if (token == "utf32be")
cs = charset::utf32be;
else if (token == "utf32le")
cs = charset::utf32le;
else if (token == "latin1")
cs = charset::latin1;
else
stream.setstate(std::ios::failbit);
return stream;
}
inline std::size_t sequenceLength(unsigned char byte, charset encoding)
{
if (encoding == charset::utf8)
{
if (byte < 0x80)
return 1;
if (byte < 0xC2)
return 0;
if (byte < 0xE0)
return 2;
if (byte < 0xF0)
return 3;
if (byte < 0xF5)
return 4;
return 0;
}
else if (encoding == charset::utf16 || encoding == charset::utf16le || encoding == charset::utf16be)
{
return 2;
}
else if (encoding == charset::utf32 || encoding == charset::utf32le || encoding == charset::utf32be)
{
return 4;
}
return 1;
}
inline std::vector<unsigned char> encode(unsigned int codepoint, charset encoding)
{
std::vector<unsigned char> result;
if (encoding == charset::utf8)
{
if (codepoint <= 0x7F)
{
result.push_back(static_cast<unsigned char>(codepoint));
}
else if (codepoint <= 0x7FF)
{
result.push_back(static_cast<unsigned char>(0xC0 | (codepoint >> 6)));
result.push_back(static_cast<unsigned char>(0x80 | (codepoint & 0x3F)));
}
else if (codepoint <= 0xFFFF)
{
if (codepoint >= 0xD800 && codepoint <= 0xDFFF)
{
result.push_back(0xEF);
result.push_back(0xBF);
result.push_back(0xBD);
}
else
{
result.push_back(static_cast<unsigned char>(0xE0 | (codepoint >> 12)));
result.push_back(static_cast<unsigned char>(0x80 | ((codepoint >> 6) & 0x3F)));
result.push_back(static_cast<unsigned char>(0x80 | (codepoint & 0x3F)));
}
}
else if (codepoint <= 0x10FFFF)
{
result.push_back(static_cast<unsigned char>(0xF0 | (codepoint >> 18)));
result.push_back(static_cast<unsigned char>(0x80 | ((codepoint >> 12) & 0x3F)));
result.push_back(static_cast<unsigned char>(0x80 | ((codepoint >> 6) & 0x3F)));
result.push_back(static_cast<unsigned char>(0x80 | (codepoint & 0x3F)));
}
else
{
result.push_back(0xEF);
result.push_back(0xBF);
result.push_back(0xBD);
}
}
else if (encoding == charset::ascii)
{
if (codepoint < 0x80)
{
result.push_back(static_cast<unsigned char>(codepoint));
}
else
{
result.push_back('?');
}
}
else if (encoding == charset::latin1)
{
if (codepoint < 0x100)
{
result.push_back(static_cast<unsigned char>(codepoint));
}
else
{
result.push_back('?');
}
}
else if (encoding == charset::utf16 || encoding == charset::utf16le)
{
if (codepoint <= 0xFFFF)
{
if (codepoint >= 0xD800 && codepoint <= 0xDFFF)
{
result.push_back(0xFD);
result.push_back(0xFF);
}
else
{
result.push_back(static_cast<unsigned char>(codepoint & 0xFF));
result.push_back(static_cast<unsigned char>((codepoint >> 8) & 0xFF));
}
}
else if (codepoint <= 0x10FFFF)
{
unsigned int high = 0xD800 + ((codepoint - 0x10000) >> 10);
unsigned int low = 0xDC00 + ((codepoint - 0x10000) & 0x3FF);
result.push_back(static_cast<unsigned char>(high & 0xFF));
result.push_back(static_cast<unsigned char>((high >> 8) & 0xFF));
result.push_back(static_cast<unsigned char>(low & 0xFF));
result.push_back(static_cast<unsigned char>((low >> 8) & 0xFF));
}
else
{
result.push_back(0xFD);
result.push_back(0xFF);
}
}
else if (encoding == charset::utf16be)
{
if (codepoint <= 0xFFFF)
{
if (codepoint >= 0xD800 && codepoint <= 0xDFFF)
{
result.push_back(0xFF);
result.push_back(0xFD);
}
else
{
result.push_back(static_cast<unsigned char>((codepoint >> 8) & 0xFF));
result.push_back(static_cast<unsigned char>(codepoint & 0xFF));
}
}
else if (codepoint <= 0x10FFFF)
{
unsigned int high = 0xD800 + ((codepoint - 0x10000) >> 10);
unsigned int low = 0xDC00 + ((codepoint - 0x10000) & 0x3FF);
result.push_back(static_cast<unsigned char>((high >> 8) & 0xFF));
result.push_back(static_cast<unsigned char>(high & 0xFF));
result.push_back(static_cast<unsigned char>((low >> 8) & 0xFF));
result.push_back(static_cast<unsigned char>(low & 0xFF));
}
else
{
result.push_back(0xFF);
result.push_back(0xFD);
}
}
else if (encoding == charset::utf32 || encoding == charset::utf32le)
{
result.push_back(static_cast<unsigned char>(codepoint & 0xFF));
result.push_back(static_cast<unsigned char>((codepoint >> 8) & 0xFF));
result.push_back(static_cast<unsigned char>((codepoint >> 16) & 0xFF));
result.push_back(static_cast<unsigned char>((codepoint >> 24) & 0xFF));
}
else if (encoding == charset::utf32be)
{
result.push_back(static_cast<unsigned char>((codepoint >> 24) & 0xFF));
result.push_back(static_cast<unsigned char>((codepoint >> 16) & 0xFF));
result.push_back(static_cast<unsigned char>((codepoint >> 8) & 0xFF));
result.push_back(static_cast<unsigned char>(codepoint & 0xFF));
}
return result;
}
inline unsigned int decode(std::string_view &input, charset encoding)
{
if (input.empty())
{
return 0xFFFD;
}
const unsigned char *data = reinterpret_cast<const unsigned char *>(input.data());
std::size_t dataLength = input.size();
if (encoding == charset::latin1)
{
unsigned char byte = data[0];
input.remove_prefix(1);
return byte;
}
else if (encoding == charset::ascii)
{
unsigned char byte = data[0];
input.remove_prefix(1);
if (byte < 0x80)
{
return byte;
}
else
{
return 0xFFFD;
}
}
else if (encoding == charset::utf8)
{
unsigned char byte = data[0];
if (byte < 0x80)
{
input.remove_prefix(1);
return byte;
}
if (byte < 0xC2)
{
input.remove_prefix(1);
return 0xFFFD;
}
std::size_t seqLen;
if (byte < 0xE0)
{
seqLen = 2;
}
else if (byte < 0xF0)
{
seqLen = 3;
}
else if (byte < 0xF5)
{
seqLen = 4;
}
else
{
input.remove_prefix(1);
return 0xFFFD;
}
if (dataLength < seqLen)
{
input.remove_prefix(dataLength);
return 0xFFFD;
}
unsigned int codepoint;
if (seqLen == 2)
{
if ((data[1] & 0xC0) != 0x80)
{
input.remove_prefix(1);
return 0xFFFD;
}
codepoint = (byte & 0x1F) << 6;
codepoint |= (data[1] & 0x3F);
if (codepoint < 0x80)
{
input.remove_prefix(2);
return 0xFFFD;
}
}
else if (seqLen == 3)
{
if ((data[1] & 0xC0) != 0x80 || (data[2] & 0xC0) != 0x80)
{
input.remove_prefix(1);
return 0xFFFD;
}
codepoint = (byte & 0x0F) << 12;
codepoint |= (data[1] & 0x3F) << 6;
codepoint |= (data[2] & 0x3F);
if (codepoint < 0x800)
{
input.remove_prefix(3);
return 0xFFFD;
}
if (codepoint >= 0xD800 && codepoint <= 0xDFFF)
{
input.remove_prefix(3);
return 0xFFFD;
}
}
else
{
if ((data[1] & 0xC0) != 0x80 || (data[2] & 0xC0) != 0x80 || (data[3] & 0xC0) != 0x80)
{
input.remove_prefix(1);
return 0xFFFD;
}
codepoint = (byte & 0x07) << 18;
codepoint |= (data[1] & 0x3F) << 12;
codepoint |= (data[2] & 0x3F) << 6;
codepoint |= (data[3] & 0x3F);
if (codepoint < 0x10000)
{
input.remove_prefix(4);
return 0xFFFD;
}
if (codepoint > 0x10FFFF)
{
input.remove_prefix(4);
return 0xFFFD;
}
}
input.remove_prefix(seqLen);
return codepoint;
}
else if (encoding == charset::utf16 || encoding == charset::utf16le)
{
if (dataLength < 2)
{
input.remove_prefix(dataLength);
return 0xFFFD;
}
unsigned short unit = data[0] | (static_cast<unsigned short>(data[1]) << 8);
if (unit >= 0xD800 && unit <= 0xDBFF)
{
if (dataLength < 4)
{
input.remove_prefix(dataLength);
return 0xFFFD;
}
unsigned short low = data[2] | (static_cast<unsigned short>(data[3]) << 8);
if (low < 0xDC00 || low > 0xDFFF)
{
input.remove_prefix(2);
return 0xFFFD;
}
unsigned int codepoint = 0x10000 + ((unit - 0xD800) << 10) + (low - 0xDC00);
input.remove_prefix(4);
return codepoint;
}
else if (unit >= 0xDC00 && unit <= 0xDFFF)
{
input.remove_prefix(2);
return 0xFFFD;
}
else
{
input.remove_prefix(2);
return unit;
}
}
else if (encoding == charset::utf16be)
{
if (dataLength < 2)
{
input.remove_prefix(dataLength);
return 0xFFFD;
}
unsigned short unit = (static_cast<unsigned short>(data[0]) << 8) | data[1];
if (unit >= 0xD800 && unit <= 0xDBFF)
{
if (dataLength < 4)
{
input.remove_prefix(dataLength);
return 0xFFFD;
}
unsigned short low = (static_cast<unsigned short>(data[2]) << 8) | data[3];
if (low < 0xDC00 || low > 0xDFFF)
{
input.remove_prefix(2);
return 0xFFFD;
}
unsigned int codepoint = 0x10000 + ((unit - 0xD800) << 10) + (low - 0xDC00);
input.remove_prefix(4);
return codepoint;
}
else if (unit >= 0xDC00 && unit <= 0xDFFF)
{
input.remove_prefix(2);
return 0xFFFD;
}
else
{
input.remove_prefix(2);
return unit;
}
}
else if (encoding == charset::utf32 || encoding == charset::utf32le)
{
if (dataLength < 4)
{
input.remove_prefix(dataLength);
return 0xFFFD;
}
unsigned int codepoint = data[0] | (static_cast<unsigned int>(data[1]) << 8) | (static_cast<unsigned int>(data[2]) << 16) | (static_cast<unsigned int>(data[3]) << 24);
input.remove_prefix(4);
if (codepoint > 0x10FFFF || (codepoint >= 0xD800 && codepoint <= 0xDFFF))
{
return 0xFFFD;
}
return codepoint;
}
else if (encoding == charset::utf32be)
{
if (dataLength < 4)
{
input.remove_prefix(dataLength);
return 0xFFFD;
}
unsigned int codepoint = (static_cast<unsigned int>(data[0]) << 24) | (static_cast<unsigned int>(data[1]) << 16) | (static_cast<unsigned int>(data[2]) << 8) | data[3];
input.remove_prefix(4);
if (codepoint > 0x10FFFF || (codepoint >= 0xD800 && codepoint <= 0xDFFF))
{
return 0xFFFD;
}
return codepoint;
}
return 0xFFFD;
}
inline std::string convert(std::string_view input, charset from, charset to)
{
if (from == to)
{
return std::string(input);
}
std::string result;
std::string_view remaining = input;
while (!remaining.empty())
{
unsigned int codepoint = decode(remaining, from);
auto encoded = encode(codepoint, to);
result.insert(result.end(), encoded.begin(), encoded.end());
}
return result;
}
inline void convert(std::string_view input, charset from, charset to, std::vector<unsigned char> &output)
{
if (from == to)
{
output.insert(output.end(), input.begin(), input.end());
return;
}
std::string_view remaining = input;
while (!remaining.empty())
{
unsigned int codepoint = decode(remaining, from);
auto encoded = encode(codepoint, to);
output.insert(output.end(), encoded.begin(), encoded.end());
}
}
inline void convert(std::string_view input, charset from, charset to, std::deque<unsigned char> &output)
{
if (from == to)
{
output.insert(output.end(), input.begin(), input.end());
return;
}
std::string_view remaining = input;
while (!remaining.empty())
{
unsigned int codepoint = decode(remaining, from);
auto encoded = encode(codepoint, to);
output.insert(output.end(), encoded.begin(), encoded.end());
}
}
class Meta
{
public:
Meta() : value(0) {}
explicit Meta(unsigned int initial) : value(initial) {}
Meta(const Meta &other) : value(other.value) {}
Meta(Meta &&other) noexcept : value(other.value) { other.value = 0; }
Meta &operator=(const Meta &other)
{
if (this != &other)
{
value = other.value;
}
return *this;
}
Meta &operator=(Meta &&other) noexcept
{
if (this != &other)
{
value = other.value;
other.value = 0;
}
return *this;
}
bool operator==(const Meta &other) const { return value == other.value; }
bool operator!=(const Meta &other) const { return value != other.value; }
bool operator<(const Meta &other) const { return value < other.value; }
unsigned int getValue() const { return value; }
private:
unsigned int value;
};
class Point
{
public:
Point() : code(0) {}
explicit Point(unsigned int codepoint) : code(codepoint) {}
Point(const Point &other) : code(other.code) {}
Point(Point &&other) noexcept : code(other.code) { other.code = 0; }
Point &operator=(const Point &other)
{
if (this != &other)
{
code = other.code;
}
return *this;
}
Point &operator=(Point &&other) noexcept
{
if (this != &other)
{
code = other.code;
other.code = 0;
}
return *this;
}
bool operator==(const Point &other) const { return code == other.code; }
bool operator!=(const Point &other) const { return code != other.code; }
bool operator<(const Point &other) const { return code < other.code; }
unsigned int getValue() const { return code; }
bool isSurrogate() const { return code >= 0xD800 && code <= 0xDFFF; }
bool isValidCodePoint() const { return code <= 0x10FFFF && !isSurrogate(); }
private:
unsigned int code;
};
class Charsequence;
class PointIterator
{
public:
using iterator_category = std::bidirectional_iterator_tag;
using value_type = Point;
using difference_type = std::ptrdiff_t;
using pointer = const Point *;
using reference = const Point &;
explicit PointIterator(std::vector<Point>::const_iterator it) : baseIterator(it) {}
reference operator*() const { return *baseIterator; }
pointer operator->() const { return &(*baseIterator); }
PointIterator &operator++()
{
++baseIterator;
return *this;
}
PointIterator operator++(int)
{
PointIterator temp = *this;
++baseIterator;
return temp;
}
PointIterator &operator--()
{
--baseIterator;
return *this;
}
PointIterator operator--(int)
{
PointIterator temp = *this;
--baseIterator;
return temp;
}
bool operator==(const PointIterator &other) const { return baseIterator == other.baseIterator; }
bool operator!=(const PointIterator &other) const { return baseIterator != other.baseIterator; }
private:
std::vector<Point>::const_iterator baseIterator;
};
class Charsequence
{
public:
Charsequence() : pointStorage(), storageEncoding(charset::utf8) {}
Charsequence(const char *str) : Charsequence(std::string_view(str), charset::utf8, charset::utf8) {}
explicit Charsequence(charset encoding) : pointStorage(), storageEncoding(encoding) {}
Charsequence(std::string_view source, charset sourceEncoding = charset::utf8, charset targetEncoding = charset::utf8)
: pointStorage(), storageEncoding(targetEncoding)
{
if (sourceEncoding == targetEncoding)
{
std::string_view remaining = source;
while (!remaining.empty())
{
pointStorage.push_back(Point(decode(remaining, targetEncoding)));
}
}
else
{
std::string converted = convert(source, sourceEncoding, targetEncoding);
std::string_view remaining = converted;
while (!remaining.empty())
{
pointStorage.push_back(Point(decode(remaining, targetEncoding)));
}
}
}
Charsequence(const Meta *source, std::size_t length, charset sourceEncoding, charset targetEncoding = charset::utf8)
: pointStorage(), storageEncoding(targetEncoding)
{
if (!source || length == 0)
{
return;
}
std::string temp;
temp.reserve(length);
for (std::size_t i = 0; i < length; ++i)
{
temp.push_back(static_cast<char>(source[i].getValue() & 0xFF));
}
if (sourceEncoding == targetEncoding)
{
std::string_view remaining = temp;
while (!remaining.empty())
{
pointStorage.push_back(Point(decode(remaining, targetEncoding)));
}
}
else
{
std::string converted = convert(std::string_view(temp), sourceEncoding, targetEncoding);
std::string_view remaining = converted;
while (!remaining.empty())
{
pointStorage.push_back(Point(decode(remaining, targetEncoding)));
}
}
}
Charsequence(const Point *source, std::size_t length, charset targetEncoding = charset::utf8)
: pointStorage(), storageEncoding(targetEncoding)
{
if (!source || length == 0)
{
return;
}
for (std::size_t i = 0; i < length; ++i)
{
pointStorage.push_back(source[i]);
}
}
Charsequence(const Charsequence &other)
: pointStorage(other.pointStorage), storageEncoding(other.storageEncoding) {}
Charsequence(Charsequence &&other) noexcept
: pointStorage(std::move(other.pointStorage)), storageEncoding(other.storageEncoding)
{
other.storageEncoding = charset::utf8;
}
Charsequence &operator=(const Charsequence &other)
{
if (this != &other)
{
pointStorage = other.pointStorage;
storageEncoding = other.storageEncoding;
}
return *this;
}
Charsequence &operator=(Charsequence &&other) noexcept
{
if (this != &other)
{
pointStorage = std::move(other.pointStorage);
storageEncoding = other.storageEncoding;
other.storageEncoding = charset::utf8;
}
return *this;
}
std::size_t size() const { return pointStorage.size(); }
bool empty() const { return pointStorage.empty(); }
Point at(std::size_t index) const
{
if (index >= pointStorage.size())
{
throw std::out_of_range("Index out of range");
}
return pointStorage[index];
}
charset encoding() const { return storageEncoding; }
Charsequence sub(std::size_t start, std::size_t length) const
{
std::size_t totalPoints = pointStorage.size();
if (start > totalPoints)
{
start = totalPoints;
}
if (length > totalPoints - start)
{
length = totalPoints - start;
}
if (length == 0)
{
Charsequence result;
result.storageEncoding = storageEncoding;
return result;
}
Charsequence result;
result.storageEncoding = storageEncoding;
for (std::size_t i = start; i < start + length && i < totalPoints; ++i)
{
result.pointStorage.push_back(pointStorage[i]);
}
return result;
}
Charsequence repeat(std::size_t count) const
{
if (count == 0)
{
Charsequence result;
result.storageEncoding = storageEncoding;
return result;
}
if (count > 1 && pointStorage.size() > std::numeric_limits<std::size_t>::max() / count)
{
throw std::overflow_error("repeat size overflow");
}
Charsequence result;
result.storageEncoding = storageEncoding;
result.pointStorage.reserve(pointStorage.size() * count);
for (std::size_t i = 0; i < count; ++i)
{
result.pointStorage.insert(result.pointStorage.end(), pointStorage.begin(), pointStorage.end());
}
return result;
}
Charsequence concat(const Charsequence &other) const
{
Charsequence result;
result.storageEncoding = storageEncoding;
result.pointStorage.reserve(pointStorage.size() + other.pointStorage.size());
result.pointStorage.insert(result.pointStorage.end(), pointStorage.begin(), pointStorage.end());
result.pointStorage.insert(result.pointStorage.end(), other.pointStorage.begin(), other.pointStorage.end());
return result;
}
bool startsWith(const Charsequence &other) const
{
if (other.pointStorage.size() > pointStorage.size())
{
return false;
}
for (std::size_t i = 0; i < other.pointStorage.size(); ++i)
{
if (pointStorage[i].getValue() != other.pointStorage[i].getValue())
{
return false;
}
}
return true;
}
bool startsWith(std::string_view str, charset strEncoding = charset::utf8) const
{
Charsequence temp(str, strEncoding, storageEncoding);
return startsWith(temp);
}
bool endsWith(const Charsequence &other) const
{
if (other.pointStorage.size() > pointStorage.size())
{
return false;
}
std::size_t offset = pointStorage.size() - other.pointStorage.size();
for (std::size_t i = 0; i < other.pointStorage.size(); ++i)
{
if (pointStorage[offset + i].getValue() != other.pointStorage[i].getValue())
{
return false;
}
}
return true;
}
bool endsWith(std::string_view str, charset strEncoding = charset::utf8) const
{
Charsequence temp(str, strEncoding, storageEncoding);
return endsWith(temp);
}
bool contains(const Charsequence &other) const
{
return indexOf(other) != static_cast<std::size_t>(-1);
}
bool contains(std::string_view str, charset strEncoding = charset::utf8) const
{
Charsequence temp(str, strEncoding, storageEncoding);
return contains(temp);
}
std::size_t indexOf(const Charsequence &other, std::size_t fromCodePoint = 0) const
{
const auto &otherPoints = other.pointStorage;
if (otherPoints.empty())
{
return 0;
}
if (fromCodePoint >= pointStorage.size())
{
return static_cast<std::size_t>(-1);
}
if (otherPoints.size() > pointStorage.size())
{
return static_cast<std::size_t>(-1);
}
for (std::size_t i = fromCodePoint; i <= pointStorage.size() - otherPoints.size(); ++i)
{
bool found = true;
for (std::size_t j = 0; j < otherPoints.size(); ++j)
{
if (pointStorage[i + j].getValue() != otherPoints[j].getValue())
{
found = false;
break;
}
}
if (found)
{
return i;
}
}
return static_cast<std::size_t>(-1);
}
std::size_t indexOf(std::string_view str, std::size_t fromCodePoint = 0, charset strEncoding = charset::utf8) const
{
Charsequence temp(str, strEncoding, storageEncoding);
return indexOf(temp, fromCodePoint);
}
std::size_t lastIndexOf(const Charsequence &other, std::size_t fromCodePoint = static_cast<std::size_t>(-1)) const
{
const auto &otherPoints = other.pointStorage;
if (otherPoints.empty())
{
return pointStorage.size();
}
if (otherPoints.size() > pointStorage.size())
{
return static_cast<std::size_t>(-1);
}
std::size_t startPosition = pointStorage.size() - otherPoints.size();
if (fromCodePoint != static_cast<std::size_t>(-1))
{
if (fromCodePoint >= pointStorage.size())
{
return static_cast<std::size_t>(-1);
}
if (fromCodePoint < startPosition)
{
startPosition = fromCodePoint;
}
}
for (std::size_t i = startPosition + 1; i > 0; --i)
{
std::size_t currentIndex = i - 1;
bool found = true;
for (std::size_t j = 0; j < otherPoints.size(); ++j)
{
if (pointStorage[currentIndex + j].getValue() != otherPoints[j].getValue())
{
found = false;
break;
}
}
if (found)
{
return currentIndex;
}
}
return static_cast<std::size_t>(-1);
}
std::size_t lastIndexOf(std::string_view str, std::size_t fromCodePoint = static_cast<std::size_t>(-1), charset strEncoding = charset::utf8) const
{
Charsequence temp(str, strEncoding, storageEncoding);
return lastIndexOf(temp, fromCodePoint);
}
Charsequence replace(const Charsequence &target, const Charsequence &replacement) const
{
if (target.pointStorage.empty())
{
return *this;
}
Charsequence result;
result.storageEncoding = storageEncoding;
std::size_t pos = 0;
while (pos < pointStorage.size())
{
std::size_t found = indexOf(target, pos);