unknown encoding: rot13

[srksrk 68]

Hello Experts,

I am trying to do an unbreakable encryption of a dialog line with the rot13 cypher documented here: https://www.renpy.org/doc/html/custom_t ... l#examples

However, neither the text tag {rot13} mentioned there, nor using function text.encode("rot13") directly work but give the error:

unknown encoding: rot13

I found other threads concerning rot13 in python (some importing codecs module, suggesting other methods, renaming to rot-13 or rot_13), but also no luck. Does anybody know how to do this without implementing the codec myself?

Many thanks!

[gas]

Mumble...
A dialogue line alone?
No need to devise a tag. Use a python shell and copy the result of rot-13 on a string.

UPDATE: verified by console that, for some reason, rot13 is actually not accessible not even listed in the codecs module. More probably, that example wasn't tested with recent releases.

[Remix]

Try changing the

Code: Select all

text = text.encode("rot13")

in the definition to

Code: Select all

text = renpy.translation.generation.rot13_transform(text)
# or
text = renpy.translation.generation.rot13_filter(text) # better for tags and interpolation

Note: Rot13 is not in any way unbreakable

[srksrk 68]

Try changing the

Code: Select all

text = text.encode("rot13")

in the definition to

Code: Select all

text = renpy.translation.generation.rot13_transform(text)

Thanks, will try that!

Note: Rot13 is not in any way unbreakable

Nooooo!

I knew that

[srksrk 68]

OK, tried it and found out that rot13_transform is totally bugged. It contains no less than two typos that make it anything but the rot13 transformation:

Code: Select all

def rot13_transform(s):

    ROT13 = { }

    for i, j in zip("ABCDEFGHIJKLM", "NMOPQRSTUVWYZ"):
        ROT13[i] = j
        ROT13[j] = i

        i = i.lower()
        j = j.lower()

        ROT13[i] = j
        ROT13[j] = i

    return "".join(ROT13.get(i, i) for i in s)

In fact, the parameters of the zip need to be ("ABCDEFGHIJKLM", "NOPQRSTUVWXYZ") to make it rot13.

So I went and implemented a combined rot13/rot5 to make it permutate digits as well. For those who are interested:

Code: Select all

def rot135_transform(s):

    ROT135 = { }

    for i, j in zip("ABCDEFGHIJKLM01234", "NOPQRSTUVWXYZ56789"):
        ROT135[i] = j
        ROT135[j] = i

        i = i.lower()
        j = j.lower()

        ROT135[i] = j
        ROT135[j] = i

    return "".join(ROT135.get(i, i) for i in s)

Thanks for the help, though!

[Remix]

I let Tom know about the rot13_transform and he has applied a fix (will be available in next main release)
Fixes to the documentation code are also on his agenda