277 lines
10 KiB
C++
277 lines
10 KiB
C++
// Copyright (c) 2014-2018 Zano Project
|
||
// Copyright (c) 2014-2018 The Louisdor Project
|
||
// Copyright (c) 2012-2013 The Boolberry developers
|
||
// Copyright (c) 2017-2025 Lethean (https://lt.hn)
|
||
//
|
||
// Licensed under the European Union Public Licence (EUPL) version 1.2.
|
||
// You may obtain a copy of the licence at:
|
||
//
|
||
// https://joinup.ec.europa.eu/software/page/eupl/licence-eupl
|
||
//
|
||
// The EUPL is a copyleft licence that is compatible with the MIT/X11
|
||
// licence used by the original projects; the MIT terms are therefore
|
||
// considered “grandfathered” under the EUPL for this code.
|
||
//
|
||
// SPDX‑License‑Identifier: EUPL-1.2
|
||
//
|
||
|
||
#ifndef UTF8_FOR_CPP_UNCHECKED_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
|
||
#define UTF8_FOR_CPP_UNCHECKED_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
|
||
|
||
#include "core.h"
|
||
|
||
namespace utf8
|
||
{
|
||
namespace unchecked
|
||
{
|
||
template <typename octet_iterator>
|
||
octet_iterator append(utfchar32_t cp, octet_iterator result)
|
||
{
|
||
return internal::append(cp, result);
|
||
}
|
||
|
||
template <typename word_iterator>
|
||
word_iterator append16(utfchar32_t cp, word_iterator result)
|
||
{
|
||
return internal::append16(cp, result);
|
||
}
|
||
|
||
template <typename octet_iterator, typename output_iterator>
|
||
output_iterator replace_invalid(octet_iterator start, octet_iterator end, output_iterator out, utfchar32_t replacement)
|
||
{
|
||
while (start != end) {
|
||
octet_iterator sequence_start = start;
|
||
internal::utf_error err_code = utf8::internal::validate_next(start, end);
|
||
switch (err_code) {
|
||
case internal::UTF8_OK :
|
||
for (octet_iterator it = sequence_start; it != start; ++it)
|
||
*out++ = *it;
|
||
break;
|
||
case internal::NOT_ENOUGH_ROOM:
|
||
out = utf8::unchecked::append(replacement, out);
|
||
start = end;
|
||
break;
|
||
case internal::INVALID_LEAD:
|
||
out = utf8::unchecked::append(replacement, out);
|
||
++start;
|
||
break;
|
||
case internal::INCOMPLETE_SEQUENCE:
|
||
case internal::OVERLONG_SEQUENCE:
|
||
case internal::INVALID_CODE_POINT:
|
||
out = utf8::unchecked::append(replacement, out);
|
||
++start;
|
||
// just one replacement mark for the sequence
|
||
while (start != end && utf8::internal::is_trail(*start))
|
||
++start;
|
||
break;
|
||
}
|
||
}
|
||
return out;
|
||
}
|
||
|
||
template <typename octet_iterator, typename output_iterator>
|
||
inline output_iterator replace_invalid(octet_iterator start, octet_iterator end, output_iterator out)
|
||
{
|
||
static const utfchar32_t replacement_marker = utf8::internal::mask16(0xfffd);
|
||
return utf8::unchecked::replace_invalid(start, end, out, replacement_marker);
|
||
}
|
||
|
||
inline std::string replace_invalid(const std::string& s, utfchar32_t replacement)
|
||
{
|
||
std::string result;
|
||
replace_invalid(s.begin(), s.end(), std::back_inserter(result), replacement);
|
||
return result;
|
||
}
|
||
|
||
inline std::string replace_invalid(const std::string& s)
|
||
{
|
||
std::string result;
|
||
replace_invalid(s.begin(), s.end(), std::back_inserter(result));
|
||
return result;
|
||
}
|
||
|
||
template <typename octet_iterator>
|
||
utfchar32_t next(octet_iterator& it)
|
||
{
|
||
utfchar32_t cp = utf8::internal::mask8(*it);
|
||
switch (utf8::internal::sequence_length(it)) {
|
||
case 1:
|
||
break;
|
||
case 2:
|
||
it++;
|
||
cp = ((cp << 6) & 0x7ff) + ((*it) & 0x3f);
|
||
break;
|
||
case 3:
|
||
++it;
|
||
cp = ((cp << 12) & 0xffff) + ((utf8::internal::mask8(*it) << 6) & 0xfff);
|
||
++it;
|
||
cp = static_cast<utfchar32_t>(cp + ((*it) & 0x3f));
|
||
break;
|
||
case 4:
|
||
++it;
|
||
cp = ((cp << 18) & 0x1fffff) + ((utf8::internal::mask8(*it) << 12) & 0x3ffff);
|
||
++it;
|
||
cp = static_cast<utfchar32_t>(cp + ((utf8::internal::mask8(*it) << 6) & 0xfff));
|
||
++it;
|
||
cp = static_cast<utfchar32_t>(cp + ((*it) & 0x3f));
|
||
break;
|
||
}
|
||
++it;
|
||
return cp;
|
||
}
|
||
|
||
template <typename octet_iterator>
|
||
utfchar32_t peek_next(octet_iterator it)
|
||
{
|
||
return utf8::unchecked::next(it);
|
||
}
|
||
|
||
template <typename word_iterator>
|
||
utfchar32_t next16(word_iterator& it)
|
||
{
|
||
utfchar32_t cp = utf8::internal::mask16(*it++);
|
||
if (utf8::internal::is_lead_surrogate(cp))
|
||
return (cp << 10) + *it++ + utf8::internal::SURROGATE_OFFSET;
|
||
return cp;
|
||
}
|
||
|
||
template <typename octet_iterator>
|
||
utfchar32_t prior(octet_iterator& it)
|
||
{
|
||
while (utf8::internal::is_trail(*(--it))) ;
|
||
octet_iterator temp = it;
|
||
return utf8::unchecked::next(temp);
|
||
}
|
||
|
||
template <typename octet_iterator, typename distance_type>
|
||
void advance(octet_iterator& it, distance_type n)
|
||
{
|
||
const distance_type zero(0);
|
||
if (n < zero) {
|
||
// backward
|
||
for (distance_type i = n; i < zero; ++i)
|
||
utf8::unchecked::prior(it);
|
||
} else {
|
||
// forward
|
||
for (distance_type i = zero; i < n; ++i)
|
||
utf8::unchecked::next(it);
|
||
}
|
||
}
|
||
|
||
template <typename octet_iterator>
|
||
typename std::iterator_traits<octet_iterator>::difference_type
|
||
distance(octet_iterator first, octet_iterator last)
|
||
{
|
||
typename std::iterator_traits<octet_iterator>::difference_type dist;
|
||
for (dist = 0; first < last; ++dist)
|
||
utf8::unchecked::next(first);
|
||
return dist;
|
||
}
|
||
|
||
template <typename u16bit_iterator, typename octet_iterator>
|
||
octet_iterator utf16to8(u16bit_iterator start, u16bit_iterator end, octet_iterator result)
|
||
{
|
||
while (start != end) {
|
||
utfchar32_t cp = utf8::internal::mask16(*start++);
|
||
// Take care of surrogate pairs first
|
||
if (utf8::internal::is_lead_surrogate(cp)) {
|
||
if (start == end)
|
||
return result;
|
||
utfchar32_t trail_surrogate = utf8::internal::mask16(*start++);
|
||
cp = (cp << 10) + trail_surrogate + internal::SURROGATE_OFFSET;
|
||
}
|
||
result = utf8::unchecked::append(cp, result);
|
||
}
|
||
return result;
|
||
}
|
||
|
||
template <typename u16bit_iterator, typename octet_iterator>
|
||
u16bit_iterator utf8to16(octet_iterator start, octet_iterator end, u16bit_iterator result)
|
||
{
|
||
while (start < end) {
|
||
utfchar32_t cp = utf8::unchecked::next(start);
|
||
if (cp > 0xffff) { //make a surrogate pair
|
||
*result++ = static_cast<utfchar16_t>((cp >> 10) + internal::LEAD_OFFSET);
|
||
*result++ = static_cast<utfchar16_t>((cp & 0x3ff) + internal::TRAIL_SURROGATE_MIN);
|
||
}
|
||
else
|
||
*result++ = static_cast<utfchar16_t>(cp);
|
||
}
|
||
return result;
|
||
}
|
||
|
||
template <typename octet_iterator, typename u32bit_iterator>
|
||
octet_iterator utf32to8(u32bit_iterator start, u32bit_iterator end, octet_iterator result)
|
||
{
|
||
while (start != end)
|
||
result = utf8::unchecked::append(*(start++), result);
|
||
|
||
return result;
|
||
}
|
||
|
||
template <typename octet_iterator, typename u32bit_iterator>
|
||
u32bit_iterator utf8to32(octet_iterator start, octet_iterator end, u32bit_iterator result)
|
||
{
|
||
while (start < end)
|
||
(*result++) = utf8::unchecked::next(start);
|
||
|
||
return result;
|
||
}
|
||
|
||
// The iterator class
|
||
template <typename octet_iterator>
|
||
class iterator {
|
||
octet_iterator it;
|
||
public:
|
||
typedef utfchar32_t value_type;
|
||
typedef utfchar32_t* pointer;
|
||
typedef utfchar32_t& reference;
|
||
typedef std::ptrdiff_t difference_type;
|
||
typedef std::bidirectional_iterator_tag iterator_category;
|
||
iterator () {}
|
||
explicit iterator (const octet_iterator& octet_it): it(octet_it) {}
|
||
// the default "big three" are OK
|
||
octet_iterator base () const { return it; }
|
||
utfchar32_t operator * () const
|
||
{
|
||
octet_iterator temp = it;
|
||
return utf8::unchecked::next(temp);
|
||
}
|
||
bool operator == (const iterator& rhs) const
|
||
{
|
||
return (it == rhs.it);
|
||
}
|
||
bool operator != (const iterator& rhs) const
|
||
{
|
||
return !(operator == (rhs));
|
||
}
|
||
iterator& operator ++ ()
|
||
{
|
||
::std::advance(it, utf8::internal::sequence_length(it));
|
||
return *this;
|
||
}
|
||
iterator operator ++ (int)
|
||
{
|
||
iterator temp = *this;
|
||
::std::advance(it, utf8::internal::sequence_length(it));
|
||
return temp;
|
||
}
|
||
iterator& operator -- ()
|
||
{
|
||
utf8::unchecked::prior(it);
|
||
return *this;
|
||
}
|
||
iterator operator -- (int)
|
||
{
|
||
iterator temp = *this;
|
||
utf8::unchecked::prior(it);
|
||
return temp;
|
||
}
|
||
}; // class iterator
|
||
|
||
} // namespace utf8::unchecked
|
||
} // namespace utf8
|
||
|
||
|
||
#endif // header guard
|
||
|