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some unicode magic

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This commit is contained in:
Niels 2015-02-15 16:56:54 +01:00
parent 3e885c8328
commit f1f72403cd
3 changed files with 96 additions and 21 deletions
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51
src/json.hpp
View file

@ -2497,14 +2497,37 @@ class basic_json
@param codepoint the code point (must be in [0x0, 0x10ffff]
@return string representation of the code point
@exception std::out_of_range if code point is >0x10ffff
@exception std::out_of_range if code point is >0x10ffff
@exception std::invalid_argument if the low surrogate is invalid
@see <http://en.wikipedia.org/wiki/UTF-8#Sample_code>
*/
inline static string_t to_unicode(const size_t codepoint)
inline static string_t to_unicode(const size_t codepoint1, size_t codepoint2 = 0)
{
string_t result;
// calculate the codepoint from the given code points
size_t codepoint = codepoint1;
if (codepoint1 >= 0xD800 and codepoint1 <= 0xDBFF)
{
if (codepoint2 >= 0xDC00 and codepoint2 <= 0xDFFF)
{
codepoint =
// high surrogate occupies the most significant 22 bits
(codepoint1 << 10)
// low surrogate occupies the least significant 15 bits
+ codepoint2
// there is still the 0xD800, 0xDC00 and 0x10000 noise
// in the result so we have to substract with:
// (0xD800 << 10) + DC00 - 0x10000 = 0x35FDC00
- 0x35FDC00;
}
else
{
throw std::invalid_argument("missing or wrong low surrogate");
}
}
if (codepoint <= 0x7f)
{
// 1-byte characters: 0xxxxxxx (ASCI)
@ -3394,12 +3417,24 @@ basic_json_parser_59:
// unicode
case 'u':
{
// get code xxxx from \uxxxx
auto codepoint = std::strtoul(i + 1, nullptr, 16);
// add unicode character(s)
result += to_unicode(codepoint);
// skip the next four characters (\uxxxx)
i += 4;
// get code xxxx from uxxxx
auto codepoint = std::strtoul(std::string(i + 1, 4).c_str(), nullptr, 16);
if (codepoint >= 0xD800 and codepoint <= 0xDBFF)
{
// get code yyyy from uxxxx\uyyyy
auto codepoint2 = std::strtoul(std::string(i + 7, 4).c_str(), nullptr, 16);
result += to_unicode(codepoint, codepoint2);
// skip the next 11 characters (xxxx\uyyyy)
i += 11;
}
else
{
// add unicode character(s)
result += to_unicode(codepoint);
// skip the next four characters (xxxx)
i += 4;
}
break;
}
}

51
src/json.hpp.re2c
View file

@ -2497,14 +2497,37 @@ class basic_json
@param codepoint the code point (must be in [0x0, 0x10ffff]
@return string representation of the code point
@exception std::out_of_range if code point is >0x10ffff
@exception std::out_of_range if code point is >0x10ffff
@exception std::invalid_argument if the low surrogate is invalid
@see <http://en.wikipedia.org/wiki/UTF-8#Sample_code>
*/
inline static string_t to_unicode(const size_t codepoint)
inline static string_t to_unicode(const size_t codepoint1, size_t codepoint2 = 0)
{
string_t result;
// calculate the codepoint from the given code points
size_t codepoint = codepoint1;
if (codepoint1 >= 0xD800 and codepoint1 <= 0xDBFF)
{
if (codepoint2 >= 0xDC00 and codepoint2 <= 0xDFFF)
{
codepoint =
// high surrogate occupies the most significant 22 bits
(codepoint1 << 10)
// low surrogate occupies the least significant 15 bits
+ codepoint2
// there is still the 0xD800, 0xDC00 and 0x10000 noise
// in the result so we have to substract with:
// (0xD800 << 10) + DC00 - 0x10000 = 0x35FDC00
- 0x35FDC00;
}
else
{
throw std::invalid_argument("missing or wrong low surrogate");
}
}
if (codepoint <= 0x7f)
{
// 1-byte characters: 0xxxxxxx (ASCI)
@ -2743,12 +2766,24 @@ class basic_json
// unicode
case 'u':
{
// get code xxxx from \uxxxx
auto codepoint = std::strtoul(i + 1, nullptr, 16);
// add unicode character(s)
result += to_unicode(codepoint);
// skip the next four characters (\uxxxx)
i += 4;
// get code xxxx from uxxxx
auto codepoint = std::strtoul(std::string(i + 1, 4).c_str(), nullptr, 16);
if (codepoint >= 0xD800 and codepoint <= 0xDBFF)
{
// get code yyyy from uxxxx\uyyyy
auto codepoint2 = std::strtoul(std::string(i + 7, 4).c_str(), nullptr, 16);
result += to_unicode(codepoint, codepoint2);
// skip the next 11 characters (xxxx\uyyyy)
i += 11;
}
else
{
// add unicode character(s)
result += to_unicode(codepoint);
// skip the next four characters (xxxx)
i += 4;
}
break;
}
}