nl_tokens: Reads a pixel at a certain location
pl_tokens: function ReadpixelCommand ( args ) { var parsed = <mask> statements . ArgumentStatement ( args ) ; if ( parsed . args . length < 2 ) throw new SyntaxError ( 'READPIXEL command requires 2 arguments' ) ; this . x = parsed . args [ 0 ] ; this . y = parsed . args [ 1 ] ; }