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[wpiutil] StringExtras: Add UnescapeCString (#4707)

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Based on implementation in glass but enhanced for generic use.
This commit is contained in:
Peter Johnson
2022-11-26 18:21:45 -08:00
committed by GitHub
parent 5804d8fa84
commit e43e2fbc84
4 changed files with 152 additions and 49 deletions
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52
glass/src/libnt/native/cpp/NetworkTables.cpp
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@@ -828,54 +828,6 @@ static bool StringToFloatArray(std::string_view in, std::vector<T>* out) {
return true;
}
static int fromxdigit(char ch) {
if (ch >= 'a' && ch <= 'f') {
return (ch - 'a' + 10);
} else if (ch >= 'A' && ch <= 'F') {
return (ch - 'A' + 10);
} else {
return ch - '0';
}
}
static std::string_view UnescapeString(std::string_view source,
wpi::SmallVectorImpl<char>& buf) {
assert(source.size() >= 2 && source.front() == '"' && source.back() == '"');
buf.clear();
buf.reserve(source.size() - 2);
for (auto s = source.begin() + 1, end = source.end() - 1; s != end; ++s) {
if (*s != '\\') {
buf.push_back(*s);
continue;
}
switch (*++s) {
case 't':
buf.push_back('\t');
break;
case 'n':
buf.push_back('\n');
break;
case 'x': {
if (!isxdigit(*(s + 1))) {
buf.push_back('x'); // treat it like a unknown escape
break;
}
int ch = fromxdigit(*++s);
if (std::isxdigit(*(s + 1))) {
ch <<= 4;
ch |= fromxdigit(*++s);
}
buf.push_back(static_cast<char>(ch));
break;
}
default:
buf.push_back(*s);
break;
}
}
return {buf.data(), buf.size()};
}
static bool StringToStringArray(std::string_view in,
std::vector<std::string>* out) {
in = wpi::trim(in);
@@ -904,7 +856,9 @@ static bool StringToStringArray(std::string_view in,
"GUI: NetworkTables: Could not understand value '{}'\n", val);
return false;
}
out->emplace_back(UnescapeString(val, buf));
val.remove_prefix(1);
val.remove_suffix(1);
out->emplace_back(wpi::UnescapeCString(val, buf).first);
}
return true;