On Dec 31, 2008, at 8:52 AM, Michael Ash wrote:
The fundamental error that everyone is making here is in assuming that a unichar is a single indivisible unit that can be tossed around at will. But it doesn't work that way. Sometimes you have multiple unichars next to each other in a grouping which must be preserved.
The old "reversing a string" problem has long since passed its prime, and is overdue for retirement. It doesn't really have any practical purpose, at least not as applied to real natural-language strings, and it certainly isn't compatible with Unicode. Not only are there, as you say, sequences of combining characters that need to be kept together, but Unicode also has state-changing control characters; an LRE/PDF pair, for example, needs to be kept in that order. There are occasionally useful operations that involve character scrambling-- anagram generation, for example--but they really only make sense within a limited character repertoire, so it would be necessary to filter the input based on some appropriate character set.
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