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From: | Stefan Monnier |
Subject: | Re: Character group folding in searches |
Date: | Fri, 06 Feb 2015 14:41:14 -0500 |
User-agent: | Gnus/5.13 (Gnus v5.13) Emacs/25.0.50 (gnu/linux) |
>> > subset of folding. A character whose folding is not a single >> > character should map to a vector or a string of characters (not sure >> > which one is best, we should choose the one that lends itself to the >> > most efficient use). >> So "folding" can turn a single char into a sequence of chars? Why not >> do it the other way? > Because the other way you cannot use char-tables. I don't see how turning single chars into char-sequences can help us handle multi-char sequences (unless maybe you restrict it so that there can only ever be one such sequence per equivalence class?). > And because matching "a" and "รก" will be hard the other way. I don't see what's hard about it: map them both to the same char (e.g. ?a). Stefan
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