Re: Matching opening and closing characters: How?

From: Hans Aberg (haberg@math.su.se)
Date: Sat Aug 08 2009 - 16:18:29 CDT

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    On 8 Aug 2009, at 01:54, Joachim Durchholz wrote:

    > * The mention of ]...[ got me thinking. I was aiming for making all
    > kinds of parentheses into the equivalent of (...), but it's
    > important to
    > allow people to define operators like |...| (say, if they are
    > designing
    > a set of operators that should mimick mathematical conventions as
    > closely as possible).

    Another example: physics "bra-ket" notation <x| and |y>, for vectors
    in Hilbert spaces.

    > In other words, different pairs of parentheses
    > would have different, programmer-defined semantics, which means the
    > programmer names the parenthese pair anyway and I don't need to rely
    > on
    > Unicode to classify parentheses.

    The grammar of the set matching pairs is not context-free.

       Hans

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