Duncan Coutts wrote:
iswspace... We could short-cut that for ascii characters.
Also, '\t', '\n', '\r', '\f', and '\v' are contiguous. So
isSpace c = c == ' '
|| c <= '\r' && c >= '\t'
|| c == '\xa0'
|| c > '\xff' && iswspace (fromIntegral (ord c)) /= 0
That makes 4 comparisons or less in the common
cases.
If we assume that ascii characters greater than '\xa0'
occur much less often than average, we can short-cut
those also and cut it down to 3 or less.
Note that the first space character above 255 is '\x1680'
(according to isSpace).
-Yitzchak
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