private string ReadObjectKey(ref char *ptr, ref char *end)
{
// return ReadString(ref ptr, ref end).Value;
// check first letter
Debug.Assert(*ptr == '\"');
ptr++;
// reset digger
_cacheDigger.Initialize();
var misshit = false;
for (; !IsEndOfJson(ref ptr, ref end) && *ptr != '\"'; ptr++)
{
if (*ptr == '\\')
{
var bp = DecodeEscapedChar(ref ptr, ref end);
if (_cacheDigger.DigNextChar(bp))
{
continue;
}
goto miss_hit;
}
if (_cacheDigger.DigNextChar(*ptr))
{
continue;
}
miss_hit:
misshit = true;
break;
}
if (IsEndOfJson(ref ptr, ref end))
{
// end in middle of string
throw CreateException(ptr, "string is not closed.");
}
// check cache result and key
if (!misshit)
{
// completed reading string
// -> read " and direct to next char
AssertAndReadNext(ref ptr, '\"');
// completing
_cacheDigger.Complete();
var key = _cacheDigger.PointingItem;
var length = _cacheDigger.ItemValidLength;
if (key.Length != length)
{
// add substring item
var item = key.Substring(0, length);
_cacheTree.Add(item);
return(item);
}
return(key);
}
// offload to original string reader
var offload = ReadString(ref ptr, ref end, true).Value;
var newkey = _cacheDigger.PointingItem?.Substring(0, _cacheDigger.ItemValidLength) + offload;
_cacheTree.Add(newkey);
return(newkey);
}
public void KeyCacheTreeDiggingTest()
{
_tree.Add("coordinates");
_tree.Add("favorited");
_tree.Add("truncated");
_tree.Add("created_at");
_tree.Add("id_str");
_tree.Add("entities");
_tree.Add("urls");
_tree.Add("expanded_url");
_tree.Add("url");
_tree.Add("indices");
_tree.Add("display_url");
_tree.Add("hashtags");
_tree.Add("user_mentions");
_tree.Add("in_reply_to_user_id_str");
_tree.Add("contributors");
_tree.Add("text");
_tree.Add("retweet_count");
_tree.Add("in_reply_to_status_id");
_tree.Add("id");
_tree.Add("geo");
_tree.Add("retweeted");
_tree.Add("possibly_sensitive");
_tree.Add("in_reply_to_user_id");
_tree.Add("place");
_tree.Add("user");
_digger.Initialize();
Assert.IsTrue(_digger.DigNextChar('i'));
Assert.IsTrue(_digger.DigNextChar('n'));
Assert.IsTrue(_digger.DigNextChar('_'));
Assert.IsTrue(_digger.DigNextChar('r'));
Assert.IsTrue(_digger.DigNextChar('e'));
Assert.IsTrue(_digger.DigNextChar('p'));
Assert.IsTrue(_digger.DigNextChar('l'));
Assert.IsTrue(_digger.DigNextChar('y'));
Assert.IsTrue(_digger.DigNextChar('_'));
Assert.IsTrue(_digger.DigNextChar('t'));
Assert.IsTrue(_digger.DigNextChar('o'));
Assert.IsTrue(_digger.DigNextChar('_'));
Assert.IsTrue(_digger.DigNextChar('u'));
Assert.IsTrue(_digger.DigNextChar('s'));
Assert.IsTrue(_digger.DigNextChar('e'));
Assert.IsTrue(_digger.DigNextChar('r'));
Assert.IsTrue(_digger.DigNextChar('_'));
Assert.IsTrue(_digger.DigNextChar('i'));
Assert.IsTrue(_digger.DigNextChar('d'));
Assert.IsTrue(_digger.DigNextChar('_'));
Assert.IsTrue(_digger.DigNextChar('s'));
Assert.IsTrue(_digger.DigNextChar('t'));
Assert.IsTrue(_digger.DigNextChar('r'));
Assert.AreEqual(_digger.PointingItem, "in_reply_to_user_id_str");
Assert.AreEqual(_digger.ItemValidLength, "in_reply_to_user_id_str".Length);
_digger.Initialize();
Assert.IsTrue(_digger.DigNextChar('i'));
Assert.IsTrue(_digger.DigNextChar('n'));
Assert.IsTrue(_digger.DigNextChar('_'));
Assert.IsTrue(_digger.DigNextChar('r'));
Assert.IsTrue(_digger.DigNextChar('e'));
Assert.IsTrue(_digger.DigNextChar('p'));
Assert.IsTrue(_digger.DigNextChar('l'));
Assert.IsTrue(_digger.DigNextChar('y'));
Assert.IsTrue(_digger.DigNextChar('_'));
Assert.IsTrue(_digger.DigNextChar('t'));
Assert.IsTrue(_digger.DigNextChar('o'));
Assert.IsTrue(_digger.DigNextChar('_'));
Assert.IsTrue(_digger.DigNextChar('s'));
Assert.IsTrue(_digger.DigNextChar('t'));
Assert.IsTrue(_digger.DigNextChar('a'));
Assert.IsTrue(_digger.DigNextChar('t'));
Assert.IsTrue(_digger.DigNextChar('u'));
Assert.IsTrue(_digger.DigNextChar('s'));
Assert.IsTrue(_digger.DigNextChar('_'));
Assert.IsTrue(_digger.DigNextChar('i'));
Assert.IsTrue(_digger.DigNextChar('d'));
Assert.IsFalse(_digger.DigNextChar('_'));
Assert.AreEqual(_digger.PointingItem, "in_reply_to_status_id");
Assert.AreEqual(_digger.ItemValidLength, "in_reply_to_status_id".Length);
}