j3d1/json
1
0
Fork 0
Code Issues Pull requests Releases Wiki Activity

some unicode magic

Browse source
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
Show stats Download patch file Download diff file Expand all files Collapse all files

51
src/json.hpp
View file

@ -2497,14 +2497,37 @@ class basic_json
@param codepoint the code point (must be in [0x0, 0x10ffff] @param codepoint the code point (must be in [0x0, 0x10ffff]
@return string representation of the code point @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> @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; 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) if (codepoint <= 0x7f)
{ {
// 1-byte characters: 0xxxxxxx (ASCI) // 1-byte characters: 0xxxxxxx (ASCI)
@ -3394,12 +3417,24 @@ basic_json_parser_59:
// unicode // unicode
case 'u': case 'u':
{ {
// get code xxxx from \uxxxx // get code xxxx from uxxxx
auto codepoint = std::strtoul(i + 1, nullptr, 16); auto codepoint = std::strtoul(std::string(i + 1, 4).c_str(), nullptr, 16);
// add unicode character(s)
result += to_unicode(codepoint); if (codepoint >= 0xD800 and codepoint <= 0xDBFF)
// skip the next four characters (\uxxxx) {
i += 4; // 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; 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] @param codepoint the code point (must be in [0x0, 0x10ffff]
@return string representation of the code point @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> @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; 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) if (codepoint <= 0x7f)
{ {
// 1-byte characters: 0xxxxxxx (ASCI) // 1-byte characters: 0xxxxxxx (ASCI)
@ -2743,12 +2766,24 @@ class basic_json
// unicode // unicode
case 'u': case 'u':
{ {
// get code xxxx from \uxxxx // get code xxxx from uxxxx
auto codepoint = std::strtoul(i + 1, nullptr, 16); auto codepoint = std::strtoul(std::string(i + 1, 4).c_str(), nullptr, 16);
// add unicode character(s)
result += to_unicode(codepoint); if (codepoint >= 0xD800 and codepoint <= 0xDBFF)
// skip the next four characters (\uxxxx) {
i += 4; // 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; break;
} }
} }

15
test/unit.cpp
View file

@ -5645,6 +5645,9 @@ TEST_CASE("parser class")
CHECK(json::parser("\"\\u2000\"").parse().get<json::string_t>() == " "); CHECK(json::parser("\"\\u2000\"").parse().get<json::string_t>() == " ");
CHECK(json::parser("\"\\uFFFF\"").parse().get<json::string_t>() == "￿"); CHECK(json::parser("\"\\uFFFF\"").parse().get<json::string_t>() == "￿");
CHECK(json::parser("\"\\u20AC\"").parse().get<json::string_t>() == "€"); CHECK(json::parser("\"\\u20AC\"").parse().get<json::string_t>() == "€");
CHECK(json::parse("\"\\ud80c\\udc60\"").get<json::string_t>() == u8"\U00013060");
CHECK(json::parse("\"\\ud83c\\udf1e\"").get<json::string_t>() == "🌞");
} }
} }
@ -5893,10 +5896,12 @@ TEST_CASE("parser class")
} }
} }
} }
// missing part of a surrogate pair
CHECK_THROWS_AS(json::parse("\"\\uD80C\""), std::invalid_argument);
// invalid surrogate pair
CHECK_THROWS_AS(json::parse("\"\\uD80C\\uD80C\""), std::invalid_argument);
CHECK_THROWS_AS(json::parse("\"\\uD80C\\u0000\""), std::invalid_argument);
CHECK_THROWS_AS(json::parse("\"\\uD80C\\uFFFF\""), std::invalid_argument);
} }
} }
TEST_CASE()
{
CHECK(json::parser("\"\\u0049\\u004e\"").parse().get<json::string_t>() == "IN");
}