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Fontastic Programming -- Addition Font

Accepted submission by martyb at 2019-03-12 01:30:42 from the the whole is greater than the sum of the parts dept.

What if someone discovered that the specifications in a font file could be Turing complete []? What if that person realized that a font could, therefore, perform computations. How about addition? Have these characters:

Proving the Turing Completeness of Fonts []:

The goal is:

I wanted to try to implement addition. The input glyph stream would be of the form “=1234+5678=” and the shaping process would turn that string into “6912”.

The sheer number of details precludes a simple summary. Mix a little recursion with a strong helping of remapping to implement some grammar productions and voila! The font file is available on Google drive [].

What "creative" [mis]applications of this technology can you think of? Define a font file that has a 1:1 mapping of all ASCII characters... except replace all instances of "123" with "456". How could you recognize this had happened to you?

Consider: imbedding it in a web page or a PDF document. Making it a new (default) printer font.

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