Online Basic Racket Interpreter

About

• This is a basic Racket Interpreter built in 2 days for fun without looking at any Racket Interpreter source code, just from playing around with DrRacket.
• This repo contains the source code for the React frontend and Flask backend of the my Online Basic Racket Interpreter website source code.
• Frontend: React
• Backend: Flask

Features

• basic operations
  ex: (+ 2 3)
• builtin functions
  ex: (gcd 12 18)
• builtin constants
  ex: pi
• console output
  ex: (printf 5)
• custom functions
  ex: (define (add_two a b) (+ a b))
• custom constants
  ex: (define x 10)

Data Types Supported

• numeric
• boolean

Builtin Functions

'cond', 'else', 'true', 'false', '=', '>', '<', '>= ', '<=', 'add1', 'sub1', '+', '-', '*', '/', '%', 'expt', 'sqr', 'sqrt', 'floor', 'ceiling', 'round', 'abs', 'max', 'min', 'gcd', 'lcm', 'sin', 'cos', 'tan', 'log', 'printf'

Builtin Constants

'pi', 'e'

Specification

• Only numeric and boolean types are supported.
• Console output must be made by using the 'printf' function.
• The 'cond' conditionals can be written with both () and [] notation.
• There cannot be any duplicate definition names or parameter names that are already defined as definition names.
• There can be numeric or boolean values in a 'cond' without an operation block ().

Sample Code Blocks

Add Two

(define x 10)
(define y (* 2 3))

(define (add_two a b)
  (+ a b))

(printf (add_two x y))

Factorial (Basic Recursion)

(define (factorial n)
  (cond [(= n 1) 1]
        [else (* n (factorial (sub1 n)))]))

(printf (factorial 10))

Factorial (Accumulative Recursion)

(define (factorial n acc)
  (cond [(= n 1) acc]
        [else (factorial (sub1 n) (* n acc))]))

(printf (factorial 10 1))

Nested Conditional

(printf (cond [(cond [(> 2 1) true]
                     [else false]) 1]
              [else 2]))

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