Summary: std.json parseString doesn't handle chars outside the
--- Comment #0 from Sean Kelly <s...@invisibleduck.org> 2011-04-28 12:24:48 PDT
According to RFC 4627, characters outside the Basic Multilingual Plane (ie.
those that require more than two bytes to represent) are encoded as a surrogate
pair in JSON strings. In effect, what you have to do is test whether a
"\uXXXX" value is >= 0xD800 and <= 0xDBFF. If so, then the next value should
be another "\uXXXX" character representing the low surrogate. To verify this,
the value should be >= 0xDC00 and <= 0xDFFF. If it isn't, then skip the
preceding "\uXXXX" value (the high surrogate) as invalid and decode the
following "\uXXXX" value as a standalone Unicode code-point (the RFC is
actually unclear on this point, but this seems the most reasonable failure
mode). Assuming that you have a valid high and low surrogate, stick them into
a wchar and convert to UTF8.
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