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Added (nested) FlexBuffer JSON parsing and output.

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FlexBuffer parser is just 40 lines of code (on top of existing parser!).

Change-Id: Idebebadafb661ca5333f5621139031f6df3c3e1a
Tested: on Linux.
This commit is contained in:
Wouter van Oortmerssen
2017-06-05 17:45:44 -07:00
parent dddd0865cb
commit 8f864aad7b
10 changed files with 332 additions and 192 deletions
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71
include/flatbuffers/util.h
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@@ -72,9 +72,8 @@ template<> inline std::string NumToString<double>(double t) {
// Sadly, std::fixed turns "1" into "1.00000", so here we undo that.
auto p = s.find_last_not_of('0');
if (p != std::string::npos) {
s.resize(p + 1); // Strip trailing zeroes.
if (s[s.size() - 1] == '.')
s.erase(s.size() - 1, 1); // Strip '.' if a whole number.
// Strip trailing zeroes. If it is a whole number, keep one zero.
s.resize(p + (s[p] == '.' ? 2 : 1));
}
return s;
}
@@ -361,6 +360,72 @@ inline std::string WordWrap(const std::string in, size_t max_length,
return wrapped;
}
inline bool EscapeString(const char *s, size_t length, std::string *_text,
bool allow_non_utf8) {
std::string &text = *_text;
text += "\"";
for (uoffset_t i = 0; i < length; i++) {
char c = s[i];
switch (c) {
case '\n': text += "\\n"; break;
case '\t': text += "\\t"; break;
case '\r': text += "\\r"; break;
case '\b': text += "\\b"; break;
case '\f': text += "\\f"; break;
case '\"': text += "\\\""; break;
case '\\': text += "\\\\"; break;
default:
if (c >= ' ' && c <= '~') {
text += c;
} else {
// Not printable ASCII data. Let's see if it's valid UTF-8 first:
const char *utf8 = s + i;
int ucc = FromUTF8(&utf8);
if (ucc < 0) {
if (allow_non_utf8) {
text += "\\x";
text += IntToStringHex(static_cast<uint8_t>(c), 2);
} else {
// There are two cases here:
//
// 1) We reached here by parsing an IDL file. In that case,
// we previously checked for non-UTF-8, so we shouldn't reach
// here.
//
// 2) We reached here by someone calling GenerateText()
// on a previously-serialized flatbuffer. The data might have
// non-UTF-8 Strings, or might be corrupt.
//
// In both cases, we have to give up and inform the caller
// they have no JSON.
return false;
}
} else {
if (ucc <= 0xFFFF) {
// Parses as Unicode within JSON's \uXXXX range, so use that.
text += "\\u";
text += IntToStringHex(ucc, 4);
} else if (ucc <= 0x10FFFF) {
// Encode Unicode SMP values to a surrogate pair using two \u escapes.
uint32_t base = ucc - 0x10000;
auto high_surrogate = (base >> 10) + 0xD800;
auto low_surrogate = (base & 0x03FF) + 0xDC00;
text += "\\u";
text += IntToStringHex(high_surrogate, 4);
text += "\\u";
text += IntToStringHex(low_surrogate, 4);
}
// Skip past characters recognized.
i = static_cast<uoffset_t>(utf8 - s - 1);
}
}
break;
}
}
text += "\"";
return true;
}
} // namespace flatbuffers
#endif // FLATBUFFERS_UTIL_H_