Joe Drago's LOLCode Interpreter:

(uses Parse::RecDescent)

Available here:

http://drago.cc/lol/

It currently handles these constructs:

• HAI - Beginning of program
• KTHXBYE - End of program
• IM IN YR [loop label] / KTHX - Loop construct
• GTFO - “break” (out of a loop)
• IZ [conditional]? [statement] - If statement (shorthand)
• IZ [conditional] O RLY? \n YA RLY [statements] \n NO WAI [statements] KTHX - If statement (long version)
• I HAS A [variable name] - Variable declaration
• I HAS A [variable name] ITZ [value] - Variable declaration with initialization
• BTW [text] - Comment
• VISIBLE [identifier] ( N [identifier] …) - Output text
• BIGGER THAN / SMALLER THAN - Conditionals (for IZ)
• UP [variablename]!![optional number] - Increment variable