328 lines
12 KiB
C++
328 lines
12 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_CHECKED_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
|
|
#define UTF8_FOR_CPP_CHECKED_H_2675DCD0_9480_4c0c_B92A_CC14C027B731
|
|
|
|
#include "core.h"
|
|
#include <stdexcept>
|
|
|
|
namespace utf8
|
|
{
|
|
// Base for the exceptions that may be thrown from the library
|
|
class exception : public ::std::exception {
|
|
};
|
|
|
|
// Exceptions that may be thrown from the library functions.
|
|
class invalid_code_point : public exception {
|
|
uint32_t cp;
|
|
public:
|
|
invalid_code_point(uint32_t cp) : cp(cp) {}
|
|
virtual const char* what() const throw() { return "Invalid code point"; }
|
|
uint32_t code_point() const {return cp;}
|
|
};
|
|
|
|
class invalid_utf8 : public exception {
|
|
uint8_t u8;
|
|
public:
|
|
invalid_utf8 (uint8_t u) : u8(u) {}
|
|
virtual const char* what() const throw() { return "Invalid UTF-8"; }
|
|
uint8_t utf8_octet() const {return u8;}
|
|
};
|
|
|
|
class invalid_utf16 : public exception {
|
|
uint16_t u16;
|
|
public:
|
|
invalid_utf16 (uint16_t u) : u16(u) {}
|
|
virtual const char* what() const throw() { return "Invalid UTF-16"; }
|
|
uint16_t utf16_word() const {return u16;}
|
|
};
|
|
|
|
class not_enough_room : public exception {
|
|
public:
|
|
virtual const char* what() const throw() { return "Not enough space"; }
|
|
};
|
|
|
|
/// The library API - functions intended to be called by the users
|
|
|
|
template <typename octet_iterator>
|
|
octet_iterator append(uint32_t cp, octet_iterator result)
|
|
{
|
|
if (!utf8::internal::is_code_point_valid(cp))
|
|
throw invalid_code_point(cp);
|
|
|
|
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:
|
|
throw not_enough_room();
|
|
case internal::INVALID_LEAD:
|
|
out = utf8::append (replacement, out);
|
|
++start;
|
|
break;
|
|
case internal::INCOMPLETE_SEQUENCE:
|
|
case internal::OVERLONG_SEQUENCE:
|
|
case internal::INVALID_CODE_POINT:
|
|
out = utf8::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::replace_invalid(start, end, out, replacement_marker);
|
|
}
|
|
|
|
template <typename octet_iterator>
|
|
uint32_t next(octet_iterator& it, octet_iterator end)
|
|
{
|
|
uint32_t cp = 0;
|
|
internal::utf_error err_code = utf8::internal::validate_next(it, end, cp);
|
|
switch (err_code) {
|
|
case internal::UTF8_OK :
|
|
break;
|
|
case internal::NOT_ENOUGH_ROOM :
|
|
throw not_enough_room();
|
|
case internal::INVALID_LEAD :
|
|
case internal::INCOMPLETE_SEQUENCE :
|
|
case internal::OVERLONG_SEQUENCE :
|
|
throw invalid_utf8(*it);
|
|
case internal::INVALID_CODE_POINT :
|
|
throw invalid_code_point(cp);
|
|
}
|
|
return cp;
|
|
}
|
|
|
|
template <typename octet_iterator>
|
|
uint32_t peek_next(octet_iterator it, octet_iterator end)
|
|
{
|
|
return utf8::next(it, end);
|
|
}
|
|
|
|
template <typename octet_iterator>
|
|
uint32_t prior(octet_iterator& it, octet_iterator start)
|
|
{
|
|
// can't do much if it == start
|
|
if (it == start)
|
|
throw not_enough_room();
|
|
|
|
octet_iterator end = it;
|
|
// Go back until we hit either a lead octet or start
|
|
while (utf8::internal::is_trail(*(--it)))
|
|
if (it == start)
|
|
throw invalid_utf8(*it); // error - no lead byte in the sequence
|
|
return utf8::peek_next(it, end);
|
|
}
|
|
|
|
/// Deprecated in versions that include "prior"
|
|
template <typename octet_iterator>
|
|
uint32_t previous(octet_iterator& it, octet_iterator pass_start)
|
|
{
|
|
octet_iterator end = it;
|
|
while (utf8::internal::is_trail(*(--it)))
|
|
if (it == pass_start)
|
|
throw invalid_utf8(*it); // error - no lead byte in the sequence
|
|
octet_iterator temp = it;
|
|
return utf8::next(temp, end);
|
|
}
|
|
|
|
template <typename octet_iterator, typename distance_type>
|
|
void advance (octet_iterator& it, distance_type n, octet_iterator end)
|
|
{
|
|
for (distance_type i = 0; i < n; ++i)
|
|
utf8::next(it, end);
|
|
}
|
|
|
|
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::next(first, last);
|
|
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)) {
|
|
if (start != end) {
|
|
uint32_t trail_surrogate = utf8::internal::mask16(*start++);
|
|
if (utf8::internal::is_trail_surrogate(trail_surrogate))
|
|
cp = (cp << 10) + trail_surrogate + internal::SURROGATE_OFFSET;
|
|
else
|
|
throw invalid_utf16(static_cast<uint16_t>(trail_surrogate));
|
|
}
|
|
else
|
|
throw invalid_utf16(static_cast<uint16_t>(cp));
|
|
|
|
}
|
|
// Lone trail surrogate
|
|
else if (utf8::internal::is_trail_surrogate(cp))
|
|
throw invalid_utf16(static_cast<uint16_t>(cp));
|
|
|
|
result = utf8::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::next(start, end);
|
|
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::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::next(start, end);
|
|
|
|
return result;
|
|
}
|
|
|
|
// The iterator class
|
|
template <typename octet_iterator>
|
|
class iterator : public std::iterator <std::bidirectional_iterator_tag, uint32_t> {
|
|
octet_iterator it;
|
|
octet_iterator range_start;
|
|
octet_iterator range_end;
|
|
public:
|
|
iterator () {}
|
|
explicit iterator (const octet_iterator& octet_it,
|
|
const octet_iterator& range_start,
|
|
const octet_iterator& range_end) :
|
|
it(octet_it), range_start(range_start), range_end(range_end)
|
|
{
|
|
if (it < range_start || it > range_end)
|
|
throw std::out_of_range("Invalid utf-8 iterator position");
|
|
}
|
|
// the default "big three" are OK
|
|
octet_iterator base () const { return it; }
|
|
uint32_t operator * () const
|
|
{
|
|
octet_iterator temp = it;
|
|
return utf8::next(temp, range_end);
|
|
}
|
|
bool operator == (const iterator& rhs) const
|
|
{
|
|
if (range_start != rhs.range_start || range_end != rhs.range_end)
|
|
throw std::logic_error("Comparing utf-8 iterators defined with different ranges");
|
|
return (it == rhs.it);
|
|
}
|
|
bool operator != (const iterator& rhs) const
|
|
{
|
|
return !(operator == (rhs));
|
|
}
|
|
iterator& operator ++ ()
|
|
{
|
|
utf8::next(it, range_end);
|
|
return *this;
|
|
}
|
|
iterator operator ++ (int)
|
|
{
|
|
iterator temp = *this;
|
|
utf8::next(it, range_end);
|
|
return temp;
|
|
}
|
|
iterator& operator -- ()
|
|
{
|
|
utf8::prior(it, range_start);
|
|
return *this;
|
|
}
|
|
iterator operator -- (int)
|
|
{
|
|
iterator temp = *this;
|
|
utf8::prior(it, range_start);
|
|
return temp;
|
|
}
|
|
}; // class iterator
|
|
|
|
} // namespace utf8
|
|
|
|
#endif //header guard
|
|
|
|
|