private static TokenEntry ReadTokenAt(TemplateSource source, int token_index)
{
var char_index = token_index + 1;
var brackets_count = 1;
var state = ReaderStates.Name;
var prev_state = state;
var last_index = source.Length - 1;
var name = "";
var body = "";
while (state != ReaderStates.Done && last_index > char_index)
{
char_index++;
var ch = source[char_index];
switch (state)
{
case ReaderStates.Name:
if (ch == ':') state = ReaderStates.Splitter;
else if (ch == '}') state = ReaderStates.CloseBracket;
else name += ch;
break;
case ReaderStates.Splitter:
prev_state = state = ReaderStates.Body;
if (ch == '{') state = ReaderStates.OpenBracket;
else if (ch == '}') state = ReaderStates.CloseBracket;
else body += ch;
break;
case ReaderStates.Body:
if (ch == '{') state = ReaderStates.OpenBracket;
else if (ch == '}') state = ReaderStates.CloseBracket;
else body += ch;
break;
case ReaderStates.OpenBracket:
if (ch == '{') brackets_count++;
state = prev_state;
if (state == ReaderStates.Body) body = string.Concat(body, '{', ch);
else if (state == ReaderStates.Name) name = string.Concat(name, '{', ch);
break;
case ReaderStates.CloseBracket:
if (ch == '}')
{
brackets_count--;
if(brackets_count==0)state = ReaderStates.Done;
}
if (state != ReaderStates.Done)
{
state = prev_state;
if (state == ReaderStates.Body) body = string.Concat(body, '}', ch);
else if (state == ReaderStates.Name) name = string.Concat(name, '}', ch);
}
break;
case ReaderStates.Done:
default:
throw new ArgumentOutOfRangeException();
}
}
if(state!=ReaderStates.Done)
throw new Exception("Can't read token: "+source.ToString());
return new TokenEntry
{
Name = name,
Body = body,
StartsAt = token_index,
EndsAt = char_index
};
}
