// Helper for parameters in key-value pair lists that should only appear
// once. Either replaces an existing entry or adds a new entry.
static void ReplaceOrInsertKeyValuePair(KeyValuePairs& kvp, const std::string& key, const std::string& value) {
assert(kvp.count(key) <= 1);
KeyValuePairs::iterator it = kvp.find(key);
if (it != kvp.end())
it->second = value;
else
kvp.insert(KeyValuePairs::value_type(key, value));
}
KeyValuePairs ParseKeyValuePairs(const std::string& encoded) {
KeyValuePairs result;
if (encoded.length() == 0) return result;
// Split by &
std::size_t last_amp = 0;
// We can bail when the last one "found" was the end of the string
while(true) {
std::size_t next_amp = encoded.find('&', last_amp+1);
std::string keyval =
(next_amp == std::string::npos) ?
encoded.substr(last_amp) :
encoded.substr(last_amp, next_amp-last_amp);
result.insert(ParseKeyValuePair(keyval));
// Track spot after the & so the first iteration works without dealing
// with -1 index
last_amp = next_amp+1;
// Exit condition
if (next_amp == std::string::npos) break;
}
return result;
}