[texhax] scrambled text

[Daniel Greenhoe]

Hi Paul,

Thank you for the source code. I use XeLaTeX and I tried your "Code
1". But it said that
  \pdfuniformdeviate
was undefined. Is \pdfuniformdeviate only defined in PDFTex? Is there
some workaround for XeTeX?

Uwe -- Thank you also for the Chickenize document. I have downloaded
it and will see if I can find what I need in there if I can't get
Paul's solution to work under my XeLaTeX setup.

Dan

On Sat, Aug 25, 2012 at 2:49 PM, Paul Isambert <zappathustra at free.fr> wrote:
> Daniel Greenhoe <dgreenhoe at gmail.com> a écrit:
>>
>> Is there any way using LaTeX to pseudo-randomly scramble a text string?
>>
>> For example is there any package with a command called, say \scramble
>> such that the syntax
>>   \scramble{blue} would produce something like eblu or uebl?
>
> If you're using PDFTeX, then try code 1 below; if you happen to use
> LuaTeX, try the much simpler code 2.
>
> Best,
> Paul
>
> % Code 1
> \newcount\letters
> \newcount\random
> \newcount\scratch
> \def\endofword{\endofword}
>
> \def\scramble#1{%
>   \letters=0
>   \countletters#1\endofword
>   \extractletters{#1}%
>   }
>
> \def\countletters#1{%
>   \unless\ifx #1\endofword
>     \advance\letters 1
>     \expandafter\countletters
>   \fi
>   }
>
> \def\extractletters#1{%
>   \advance\letters-1
>   \def\rest{}%
>   \ifnum\letters>0
>     \random=\pdfuniformdeviate\numexpr\letters+1\relax
>     \scratch=0
>     \getletter#1\endofword%
>   \else
>     #1%
>   \fi
>   }
>
> \def\getletter#1{%
>   \ifnum\scratch=\random
>     #1%
>     \expandafter\getrestofword
>   \else
>     \advance\scratch 1
>     \edef\rest{\rest#1}%
>     \expandafter\getletter
>   \fi
>   }
>
> \def\getrestofword#1\endofword{%
>   \expandafter\extractletters\expandafter{\rest#1}%
>   }
>
> \scramble{scramble}
> % End of code 1
>
> % Code 2
> \bgroup
> \catcode`\#=12 \catcode`\?=6
> \gdef\scramble?1{%
>   \directlua{%
>     local str = string.explode("\luaescapestring{?1}", "")
>     local out = ""
>     while #str > 0 do
>       out = out .. table.remove(str, math.random(#str))
>     end
>     tex.print(out)
>     }%
>   }
> \egroup
>
> \scramble{scramble}
> % End of code 2
>
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