On Wed, Jul 21, 2010 at 1:28 AM, Aaron Sherman <a...@ajs.com> wrote: > > For reference, this is the relevant section of the spec: > > Character positions are incremented within their natural range for any > Unicode range that is deemed to represent the digits 0..9 or that is deemed > to be a complete cyclical alphabet for (one case of) a (Unicode) script. > Only scripts that represent their alphabet in codepoints that form a cycle > independent of other alphabets may be so used. (This specification defers to > the users of such a script for determining the proper cycle of letters.) We > arbitrarily define the ASCII alphabet not to intersect with other scripts > that make use of characters in that range, but alphabets that intersperse > ASCII letters are not allowed. > > > I'm not sure that all of that tracks with the Unicode standard's use of > some of the terms, but based on what we've discussed, perhaps we could get > more specific there: > > Character positions are incremented within their Unicode Script, but only > in keeping with their General Category property. Thus C<"A"++> yields C<"B"> > which is the next codepoint, but C<"Ă"++> yields C<"Ą"> even though "ą" > falls between the two, when incrementing codepoints. Should this prove > problematic for any specific Unicode Script which requires special handling > (e.g. because a "letter" really isn't used as a letter at all), such special > handling may be applied, but the above is the general rule. > > Oh, so close! I realized that I broke the original spec, here. We need to add back in:
There are two special cases: the ASCII-compatible lower-case letters (a-z) and the ASCII-compatible upper-case letters (A-Z). For historical reasons, these, by default, will not increment past the end of their ranges into the higher-codepoint Latin characters. Note: we might want a pragma for that as well. I'd suggest that perhaps it should be a locale-specific feature? So, if you set your locale to fr, then you include in those ranges all of the Latin characters used in French. -- Aaron Sherman Email or GTalk: a...@ajs.com http://www.ajs.com/~ajs
