Interval confusion

[geme]

I need the following function:

function getIntervalValue(){
    var s = getInterval();
    if (s == null) return s;
    switch (s.charAt(s.length-1)) {
       case "T" : // Tick
          return getCurrentBarCount(); // ????
          break;
       case "V" : // Volume (TODO)
          return null;
          break;
       case "R" : // Range (TODO)
          return null;
          break;
       case "P" : // Price Change (TODO)
          return null;
          break;
       case "S" : // Second
          return getSecond();
          break;
       case "H" : // Hour ?????
          return getHour();
          break;
       case "D" : // Day
          return getDay();
          break;
       case "W" : // Week (TODO)
          return null;
          break;
       case "M" : // Month
          return getMonth();
          break;
       default : // Minute
          return getMinute();
    }
} 

What is the contraction for hour?
How is the logic for weeks?

I found the following documentation:

s. Attach file