Evironments

RobotEnv: - position of the robot - position of the ball - has the ball - size of the environment

Strings: - string - position in the list of characters

PixelImages: - size of the image - pixel values (matrix) - position of the pointer

Language tokens

Class Token:

BoolToken: () - AtTop - AtBottom - AtLeft - AtRight - AtStart - AtEnd - isLetter - notLetter - isUpperCase - NotUpperCase - IsLowerCase - NotLowercase - IsNumber - NotNumber - isSpace - NotSpace
TransToken: (return the env) - Grab (robots) - grabs a ball into hand - if the ball is not at the current position, don't take anything - Drop (robots) - drop a ball at the current position - if no ball in hand, nothing happens - MoveRight (robots/strings/pixels) - move the position of the robot to the right - if it crosses the boundary, return exception - if it holds the ball, also change the position of the ball - MoveLeft (robots/strings/pixels) - MoveUp (robots/pixels) - MoveDown (robots/pixels) - MakeUppercase (strings) - make the character at the current position uppercase - if it is already uppercase, no changes - MakeLowercase (string) - opposite of MakeUppercase - Drop (strings) - drop the current character - if the last char, then delete and move one position to the left - DrawPixel (pixels)- set the pixel at the current position to 1
controlToken: - If (cond,b1,b2) - Recurse(cond, [base_case], [transform]+Recurse)
InventedToken: these come from the invent stage

Exception: throw the actual Python exception

Class AtTop:

def apply(env): return True/False

Class MoveLeft:

   def apply(env):
            do what you need
			return NewEnv/Exception