initiated the programming ritual

main.rkt

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+;; The first three lines of this file were inserted by DrRacket. They record metadata
+;; about the language level of this file in a form that our tools can easily process.
+#reader(lib "htdp-intermediate-lambda-reader.ss" "lang")((modname main) (read-case-sensitive #t) (teachpacks ()) (htdp-settings #(#t constructor repeating-decimal #f #t none #f () #f)))
+; 2018-11-21 - Made by Claudio Maggioni - Tommaso Rodolfo Masera
+
+; easybf
+
+; A Byte is an Int between 0 and 255
+; Interpretation: a byte in decimal notation.
+
+; A Tape is a NEList<Byte>
+; Interpretation: a tape in brainf*ck's Turing machine.
+
+; A DataPointer (DP) is a NonNegInt
+; Interpretation: an data pointer in the brainf*ck language in a tape.
+
+; A Program is a String of:
+; - ">"
+; - "<"
+; - "+"
+; - "-"
+; - "."
+; - ","
+; - "["
+; - "]"
+; Interpretation: the brainf*ck program.
+
+; A InstructionPointer (IP) is a NonNegInt
+; Interpretation: a pointer to the instruction to execute.
+
+; A World is a (make-world tape dp output program ip) where:
+; - tape: Tape
+; - dp: DataPointer
+; - output: String
+; - program: Program
+; - ip: InstructionPointer
+; Interpretation: the current state of execution of a brainf*ck program.
+(define-struct world [tape dp output program ip])
+
+; Template function for World
+(define (fn-for-world w)
+  (... (world-tape w)
+       (world-dp w)
+       (world-output w)
+       (world-program w)
+       (world-ip w)))
+
+; TODO:
+; - read-file: FileName -> String
+; - string->program: String -> Program (filter of valid instructions)
+; - program->world: Program -> World (compute initial world state)
+; - big-bang:
+; - - - - - - inital state (make-world (list 0) 0 "" <program> 0)
+; - - - - - - on-tick fetch, decode, execute 
+; - - - - - - on-key for ","
+; - - - - - - (on-mouse for stepper)
+; - - - - - - (draw-scene for output and tape)