Problem
Description: I once took a nap on my keyboard. I dreamed of a brand new language, but I could not decipher it nor get its meaning. Can you help me? Hint: Replace the spaces with either ‘{’ or ‘}’ in the solution. Hint: Interpreters don’t help. Operations write to the current index.
(rev80, solved by 95)
Attachment: rev80.zip
Solution
$ cat task/priner.tb
## %% %++ %++ %++ %# *&* @** %# **&* ***-* ***-* %++ %++ @*** *-* @*** @** *+** @*** ***+* @*** **+** ***+* %++ @*** #% %% %++ %++ %++ %++ @* %# %++ %++ %++ %% *&** @* @*** *-** @* %# %++ @** *-** *-** **-*** **-*** **-*** @** @*** #% %% %++ %++ %++ %++ %# *+** %++ @** @* %# *+** @*** ## %% @***
It took some time to find out what language this is, but since the title of the challenge is Eso Taaape, you could see this as a hint towards esoteric languages and something tape based. We found out it was the relatively unknown language TapeBagel.
The existing implementation in perl seemed a bit broken and did not seem to like the provided code.
So I put on my robe and a wizard hat and did some attack python-fu. It ain’t pretty but i wrote it in just a couple of minutes. Behold, the TapeBagel interpreter!
s = "## %% %++ %++ %++ %# *&* @** %# **&* ***-* ***-* %++ %++ @*** *-* @*** @** *+** @*** ***+* @*** **+** ***+* %++ @*** #% %% %++ %++ %++ %++ @* %# %++ %++ %++ %% *&** @* @*** *-** @* %# %++ @** *-** *-** **-*** **-*** **-*** @** @*** #% %% %++ %++ %++ %++ %# *+** %++ @** @* %# *+** @*** ## %% @*** "
tokens = s.strip().split(' ')
out = ""
ints = [0, 0, 0, 0, 0]
index = 0
for t in tokens:
if (t == '%%'):
index = 0
elif (t == '%++'):
ints[index] += 1
elif (t == '%#'):
index += 1
elif (t == '##'):
ints[0] = 0
ints[1] = 0
ints[2] = 0
elif (t == '#%'):
ints[0] = 1
ints[1] = 1
ints[2] = 1
elif (t == '*&*'):
ints[index] = ints[0] * ints[0]
elif (t == '**&*'):
ints[index] = ints[1] * ints[0]
elif (t == '***&*'):
ints[index] = ints[2] * ints[0]
elif (t == '*&**'):
ints[index] = ints[0] * ints[1]
elif (t == '**&**'):
ints[index] = ints[1] * ints[1]
elif (t == '***&**'):
ints[index] = ints[2] * ints[1]
elif (t == '*&***'):
ints[index] = ints[0] * ints[2]
elif (t == '**&***'):
ints[index] = ints[1] * ints[2]
elif (t == '***&***'):
ints[index] = ints[2] * ints[2]
elif (t == '*-*'):
ints[index] = ints[0] - ints[0]
elif (t == '**-*'):
ints[index] = ints[1] - ints[0]
elif (t == '***-*'):
ints[index] = ints[2] - ints[0]
elif (t == '*-**'):
ints[index] = ints[0] - ints[1]
elif (t == '**-**'):
ints[index] = ints[1] - ints[1]
elif (t == '***-**'):
ints[index] = ints[2] - ints[1]
elif (t == '*-***'):
ints[index] = ints[0] - ints[2]
elif (t == '**-***'):
ints[index] = ints[1] - ints[2]
elif (t == '***-***'):
ints[index] = ints[2] - ints[2]
elif (t == '*+*'):
ints[index] = ints[0] + ints[0]
elif (t == '**+*'):
ints[index] = ints[1] + ints[0]
elif (t == '***+*'):
ints[index] = ints[2] + ints[0]
elif (t == '*+**'):
ints[index] = ints[0] + ints[1]
elif (t == '**+**'):
ints[index] = ints[1] + ints[1]
elif (t == '***+**'):
ints[index] = ints[2] + ints[1]
elif (t == '*+***'):
ints[index] = ints[0] + ints[2]
elif (t == '**+***'):
ints[index] = ints[1] + ints[2]
elif (t == '***+***'):
ints[index] = ints[2] + ints[2]
elif (t == '@*'):
out += chr(ord('@') + ints[0])
elif (t == '@**'):
out += chr(ord('@') + ints[1])
elif (t == '@***'):
out += chr(ord('@') + ints[2])
else:
print "unhandled", t
print out
The output was IW@ILOVETAPEBAGEL@.
Flag: IW{ILOVETAPEBAGEL}