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NetworkTable: Add key utility functions. (#256)

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- BasenameKey
- NormalizeKey
- GetHierarchy
This commit is contained in:
Peter Johnson
2017-11-19 11:52:10 -08:00
committed by GitHub
parent 551504e773
commit 0e4a1c5dae
5 changed files with 293 additions and 0 deletions
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50
src/main/native/cpp/networktables/NetworkTable.cpp
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@@ -22,6 +22,56 @@ bool NetworkTable::s_enable_ds = true;
bool NetworkTable::s_running = false;
unsigned int NetworkTable::s_port = NT_DEFAULT_PORT;
StringRef NetworkTable::BasenameKey(StringRef key) {
size_t slash = key.rfind(PATH_SEPARATOR_CHAR);
if (slash == StringRef::npos) return key;
return key.substr(slash + 1);
}
std::string NetworkTable::NormalizeKey(StringRef key, bool withLeadingSlash) {
llvm::SmallString<128> buf;
return NormalizeKey(key, buf, withLeadingSlash);
}
StringRef NetworkTable::NormalizeKey(StringRef key,
llvm::SmallVectorImpl<char>& buf,
bool withLeadingSlash) {
buf.clear();
if (withLeadingSlash) buf.push_back(PATH_SEPARATOR_CHAR);
// for each path element, add it with a slash following
llvm::SmallVector<StringRef, 16> parts;
key.split(parts, PATH_SEPARATOR_CHAR, -1, false);
for (auto i = parts.begin(); i != parts.end(); ++i) {
buf.append(i->begin(), i->end());
buf.push_back(PATH_SEPARATOR_CHAR);
}
// remove trailing slash if the input key didn't have one
if (!key.empty() && key.back() != PATH_SEPARATOR_CHAR) buf.pop_back();
return StringRef(buf.data(), buf.size());
}
std::vector<std::string> NetworkTable::GetHierarchy(StringRef key) {
std::vector<std::string> hierarchy;
hierarchy.emplace_back(1, PATH_SEPARATOR_CHAR);
// for each path element, add it to the end of what we built previously
llvm::SmallString<128> path;
llvm::SmallVector<StringRef, 16> parts;
key.split(parts, PATH_SEPARATOR_CHAR, -1, false);
if (!parts.empty()) {
for (auto i = parts.begin(); i != parts.end(); ++i) {
path += PATH_SEPARATOR_CHAR;
path += *i;
hierarchy.emplace_back(path.str());
}
// handle trailing slash
if (key.back() == PATH_SEPARATOR_CHAR) {
path += PATH_SEPARATOR_CHAR;
hierarchy.emplace_back(path.str());
}
}
return hierarchy;
}
void NetworkTable::Initialize() {
if (s_running) Shutdown();
auto inst = NetworkTableInstance::GetDefault();