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In honor of Star Wars day, I've put together this small Python program I'm calling JediScript. JediScript is essentially a scrapped-down version of BrainFuck without input or looping. Here are the commands in JediScript.

  • SlashWithSaber: Move forward on the tape.
  • ParryBladeWithSaber: Move backward on the tape.
  • StabWithSaber: Increment a cell.
  • BlockBladeWithSaber: Decrement cell.
  • UseForceWithHands: Output the current cell.

Each command is semicolon ; separated, like so: StabWithSaber;UseForceWithHands. Here's an example input. This will output the character p.

StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;StabWithSaber;UseForceWithHands;

This is something that I threw together in about 20 minutes, so it's not the greatest, but I'd still appreciate a review.

#!/usr/bin/env python """ JediScript, BrainFuck for Star Wars. May the 4th be with you. """ DEFAULT_SPLIT = ";" """ Variables below this are environment variables for the user to modify. """ data_tape = [0 for _ in range(256)] tape_pos = 0 def increment_cell(): global data_tape global tape_pos data_tape[tape_pos] += 1 if data_tape[tape_pos] <= 127 else 0 def decrement_cell(): global data_tape global tape_pos data_tape[tape_pos] -= 1 if data_tape[tape_pos] >= 0 else 0 def move_forward(): global tape_pos tape_pos += 1 if tape_pos <= len(data_tape) - 1 else 0 def move_backward(): global tape_pos tape_pos -= 1 if tape_pos >= 0 else 0 def output_cell(): print chr(data_tape[tape_pos]) """ Dictionary contains tokens that reference their relevant functions. """ TOKENS = { "SlashWithSaber": move_forward, "ParryBladeWithSaber": move_backward, "StabWithSaber": increment_cell, "BlockBladeWithSaber": decrement_cell, "UseForceWithHands": output_cell, } def execute_commands(tokenized_string): """ Executes commands from the tokenized string. tokenized_string - The tokenized string """ for token in tokenized_string: if token in TOKENS: TOKENS[token]() def tokenize_input(string): """ Tokenize a string into it's the form [ token, ... ] string - The string to tokenize. """ string = string.replace(" ", "") string = string.split(DEFAULT_SPLIT) return string def get_user_input(prompt): """ Get input from the user. prompt - The prompt to be used. """ while True: string = raw_input(prompt) string = tokenize_input(string) execute_commands(string) if __name__ == "__main__": get_user_input("JediScript $ ")
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    \$\begingroup\$ About your language: I guess new-line separated is easier to read. \$\endgroup\$ Commented May 4, 2015 at 19:05
  • \$\begingroup\$ I am not sure if I am missing something, but what does the spherical notes do? Other than error? \$\endgroup\$ Commented May 11, 2016 at 14:40

1 Answer 1

Reset to default
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  • Why do you allow each cell of the tape to hold numbers from -1 to 128? seems like an odd range.
  • in move_backward() why do you allow the tape to reach position -1?
  • in move_forward() why do you allow the tape's position to be beyond the end of the tape?
  • In general you should be using exclusive comparisons (without the =) as you'll make fewer mistakes.
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    \$\begingroup\$ I don't understand why using exclusive comparisons would make fewer mistakes ? \$\endgroup\$ Commented May 4, 2015 at 17:16
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    \$\begingroup\$ I don't either, but there's actually research on it. Coders who use an exclusive comparison for the top-end of the loop or the range make fewer off-by-one errors than coders who use the "-or-equal-to" comparators. \$\endgroup\$ Commented May 4, 2015 at 17:33
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    \$\begingroup\$ I would be interested in the link to that research! \$\endgroup\$ Commented May 4, 2015 at 17:36
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    \$\begingroup\$ Searched a while and all I came up with was cs.utexas.edu/users/EWD/transcriptions/EWD08xx/EWD831.html I'll keep looking \$\endgroup\$ Commented May 4, 2015 at 19:14

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