Deadfish "self-interpreter"

Deadfish "self-interpreter" is a small Deadfish extension that supports interpreting Deadfish.

Syntax

Accumulator b is equivalent to Deadfish's accumulator, whereas accumulator a stores one character.

Instruction	Description
a	input accumulator a
i	increment accumulator b
d	decrement accumulator b
s	square accumulator b
o	output accumulator b
j	jump back to the start of the program
:	if the character after : is equal to a, interpret that character, else, skip it.

Example programs

Deadfish interpreter

a:i:d:s:oj

"Truth-machine"

For input 0, input 0, then 0. For input 1, input i, then j, then 0, then j, then repeat inputting 0j.

a:ioa:j

Implementations

Python

Implementation by User:JonoCode9374 and User:HungKhanh0106

acc = 0
input_acc = 0
 
def run(program):
    global acc, input_acc
    ip = 0
    while ip < len(program):
        if acc == 256 or acc < 0: acc = 0
        if program[ip] == "j": ip = 0; continue
        elif program[ip] == "i": acc += 1
        elif program[ip] == "d": acc -= 1
        elif program[ip] == "s": acc *= acc
        elif program[ip] == "o": print(acc)
        elif program[ip] == ":" and ord(program[ip + 1]) == input_acc: run(chr(input_acc)); ip += 2; continue
        elif program[ip] == "a": try: input_acc = ord(input(">"));except: continue
        ip += 1


while True: source = input(">> "); run(source)

See also

• Deadfish