Cat Interpreter in JavaScript with Turtle Graphics

Ehud recently lamented the lack of small interpreters for people to play with. I thought I would take this as an invitation share my JavaScript version of Cat that supports turtle graphics:

The parsing code will definitely make the angels weep and programmers gnash their teeth.


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exception caught: TypeError, Undefined value

Thanks, but in Safari the graphical directives are not defined (set_color, fill_ellipse etc). Seems to work in Mozilla though.


Took me a second to realize the rt is tr and lt is tl. cs is clear_output (but if I am not mistaken does not take the turtle back home).