This is an interpreter for an assignment given in the programming paradigms class at the royal institute of technology (KTH) in Sweden.
"Leonardo" is a graphics turtle.
-i <filename> to specify the input file containing commands. If not specified, stdin will be used as the input.
-o <filename to specify where to output the resulting image. The default is "a.png".
The language has 8 keywords:
FORW d moves Leonardo d steps forward.
BACK d moves Leonardo d steps backwards.
LEFT Θ turns Leonardo Θ degrees to the left.
RIGHT Θ turns Leonardo Θ degrees to the right.
UP lifts the pen up if it is down.
DOWN lowers the pen if it is up.
COLOR #rrggbb sets the color of the pen using standard RGB formatting. e.g. #FF0000 would make the pen red.
REP r "cmds" repeats the commands contained within the quotes r times. Quotes are optional if you want to repeat a single statement.
All commands must be followed by a ., except for REP. All commands are case insensitive. Leonardo starts at position (0,0) facing (1,0).