275 lines
11 KiB
C++
275 lines
11 KiB
C++
// Copyright 2006 Nemanja Trifunovic
|
|
|
|
/*
|
|
Permission is hereby granted, free of charge, to any person or organization
|
|
obtaining a copy of the software and accompanying documentation covered by
|
|
this license (the "Software") to use, reproduce, display, distribute,
|
|
execute, and transmit the Software, and to prepare derivative works of the
|
|
Software, and to permit third-parties to whom the Software is furnished to
|
|
do so, all subject to the following:
|
|
|
|
The copyright notices in the Software and this entire statement, including
|
|
the above license grant, this restriction and the following disclaimer,
|
|
must be included in all copies of the Software, in whole or in part, and
|
|
all derivative works of the Software, unless such copies or derivative
|
|
works are solely in the form of machine-executable object code generated by
|
|
a source language processor.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
|
|
SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
|
|
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
|
|
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
|
|
DEALINGS IN THE SOFTWARE.
|
|
*/
|
|
|
|
|
|
#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(uint32_t cp, octet_iterator result)
|
|
{
|
|
if (cp < 0x80) // one octet
|
|
*(result++) = static_cast<uint8_t>(cp);
|
|
else if (cp < 0x800) { // two octets
|
|
*(result++) = static_cast<uint8_t>((cp >> 6) | 0xc0);
|
|
*(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
|
|
}
|
|
else if (cp < 0x10000) { // three octets
|
|
*(result++) = static_cast<uint8_t>((cp >> 12) | 0xe0);
|
|
*(result++) = static_cast<uint8_t>(((cp >> 6) & 0x3f) | 0x80);
|
|
*(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
|
|
}
|
|
else { // four octets
|
|
*(result++) = static_cast<uint8_t>((cp >> 18) | 0xf0);
|
|
*(result++) = static_cast<uint8_t>(((cp >> 12) & 0x3f)| 0x80);
|
|
*(result++) = static_cast<uint8_t>(((cp >> 6) & 0x3f) | 0x80);
|
|
*(result++) = static_cast<uint8_t>((cp & 0x3f) | 0x80);
|
|
}
|
|
return result;
|
|
}
|
|
|
|
template <typename octet_iterator, typename output_iterator>
|
|
output_iterator replace_invalid(octet_iterator start, octet_iterator end, output_iterator out, uint32_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 uint32_t replacement_marker = utf8::internal::mask16(0xfffd);
|
|
return utf8::unchecked::replace_invalid(start, end, out, replacement_marker);
|
|
}
|
|
|
|
template <typename octet_iterator>
|
|
uint32_t next(octet_iterator& it)
|
|
{
|
|
uint32_t cp = utf8::internal::mask8(*it);
|
|
typename std::iterator_traits<octet_iterator>::difference_type length = utf8::internal::sequence_length(it);
|
|
switch (length) {
|
|
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 += (*it) & 0x3f;
|
|
break;
|
|
case 4:
|
|
++it;
|
|
cp = ((cp << 18) & 0x1fffff) + ((utf8::internal::mask8(*it) << 12) & 0x3ffff);
|
|
++it;
|
|
cp += (utf8::internal::mask8(*it) << 6) & 0xfff;
|
|
++it;
|
|
cp += (*it) & 0x3f;
|
|
break;
|
|
}
|
|
++it;
|
|
return cp;
|
|
}
|
|
|
|
template <typename octet_iterator>
|
|
uint32_t peek_next(octet_iterator it)
|
|
{
|
|
return utf8::unchecked::next(it);
|
|
}
|
|
|
|
template <typename octet_iterator>
|
|
uint32_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) {
|
|
uint32_t cp = utf8::internal::mask16(*start++);
|
|
// Take care of surrogate pairs first
|
|
if (utf8::internal::is_lead_surrogate(cp)) {
|
|
uint32_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) {
|
|
uint32_t cp = utf8::unchecked::next(start);
|
|
if (cp > 0xffff) { //make a surrogate pair
|
|
*result++ = static_cast<uint16_t>((cp >> 10) + internal::LEAD_OFFSET);
|
|
*result++ = static_cast<uint16_t>((cp & 0x3ff) + internal::TRAIL_SURROGATE_MIN);
|
|
}
|
|
else
|
|
*result++ = static_cast<uint16_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 uint32_t value_type;
|
|
typedef uint32_t* pointer;
|
|
typedef uint32_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; }
|
|
uint32_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
|
|
|