Dang cute.
On Jan 17, 2013, at 7:03 AM, Pierpaolo Bernardi wrote:
> Hello,
>
> try the following in the interaction panel of DrRacket:
>
> (display (integer->char #x2144))
>
> Or, just put this character in an editor buffer.
> The character is displayed 3 lines below its proper position.
>
> AFAIK, this character is a normal ‘Letterlike Symbol’. It shouldn't
> have any misterious formatting properties, and it's a character of
> fundamental importance for writing ¡uʍop ǝpısdn 8^)
>
> (latest nightly build, on windows 8)
>
> Puzzled P.
>
> ========
> #lang racket
>
> (provide upside-down)
>
> (define table
> (let ()
> (define (putin t s1 s2)
> (for/fold ((t t))
> ((c1 (in-string s1))
> (c2 (in-string s2)))
> (hash-set t c1 c2)))
> (for/fold ((t (hash)))
> ((pair (in-list '(("abcdefghijklmnopqrstuvwxyz?!’._()[]{}<>;"
> "ɐqɔpǝɟƃɥıɾʞןɯuodbɹsʇnʌʍxʎz¿¡,˙‾)(][}{><؛")
> ("ABCDEFGHIJKLMNOPQRSTUVWXYZ"
> "∀qƆpƎℲפHIſʞ˥WNOԀQɹS┴∩ΛMX⅄Z")
> ))))
> (putin t (first pair) (second pair)))))
>
> (define (upside-down string)
> (list->string
> (reverse
> (for/list ((c (in-string string)))
> (hash-ref table c c)))))
>
> ========
>
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