void core::append(const bsoncxx::types::value& value) {
switch (static_cast<int>(value.type())) {
#define BSONCXX_ENUM(type, val) \
case val: \
append(value.get_##type()); \
break;
#include <bsoncxx/enums/type.hpp>
#undef BSONCXX_ENUM
}
}
Mave FromBson(bsoncxx::types::value bson)
{
Mave result;
vector<function<bool()>> continuations;
auto root = bson;
while (true)
{
switch (bson.type())
{
case bsoncxx::type::k_undefined:
case bsoncxx::type::k_minkey:
case bsoncxx::type::k_maxkey:
break;
case bsoncxx::type::k_null:
result = nullptr;
break;
case bsoncxx::type::k_bool:
result = bson.get_bool().value;
break;
case bsoncxx::type::k_int32:
result = bson.get_int32().value;
break;
case bsoncxx::type::k_int64:
result = bson.get_int64().value;
break;
case bsoncxx::type::k_double:
result = bson.get_double().value;
break;
case bsoncxx::type::k_date:
result = milliseconds(bson.get_date().value);
break;
case bsoncxx::type::k_utf8:
result = bson.get_utf8().value.to_string();
break;
case bsoncxx::type::k_oid:
result = make_pair(BSON_OID, bson.get_oid().value.to_string());
break;
case bsoncxx::type::k_dbpointer:
result = make_pair(BSON_OID, bson.get_dbpointer().value.to_string());
break;
case bsoncxx::type::k_timestamp:
auto t = bson.get_timestamp();
result = (long)(((unsigned long long)t.timestamp << 32) | t.increment);
break;
case bsoncxx::type::k_binary:
auto b = bson.get_binary();
result = string((const char*)b.bytes, b.size);
break;
case bsoncxx::type::k_regex:
result = bson.get_regex().regex.to_string();
break;
case bsoncxx::type::k_symbol:
result = bson.get_symbol().symbol.to_string();
break;
case bsoncxx::type::k_code:
result = bson.get_code().code.to_string();
break;
case bsoncxx::type::k_codewscope:
result = bson.get_codewscope().code.to_string();
break;
case bsoncxx::type::k_document:
continuations.push_back(
[&
, m = map<string, Mave>()
, i = bson.get_document().value.cbegin()
, e = bson.get_document().value.cend()
, f = false]() mutable -> bool
{
if (f)
{
m.insert({ i->key().to_string(), result });
++i;
}
if (i != e)
{
bson = i->get_value();
return f = true;
}
result = move(m);
return false;
});
break;
case bsoncxx::type::k_array:
continuations.push_back(
[&
, v = vector<Mave>()
, i = bson.get_array().value.cbegin()
, e = bson.get_array().value.cend()
, f = false]() mutable -> bool
{
if (f)
{
v.push_back(result);
++i;
}
if (i != e)
{
bson = i->get_value();
return f = true;
}
result = move(v);
return false;
});
break;
default:
throw exception("Mave::FromBson(): unsupported type encountered");
}
while (true)
{
if (continuations.size() == 0)
{
return result;
}
if (continuations.back()())
{
break;
}
continuations.pop_back();
}
}
}
