You can't use \u10FFFF as syntax, because that could be \u10FF followed by
literal FF. A better syntax is \u{...}, with 1 to 6 digits, values from 0
.. 10FFFF.Mark *— Il meglio è l’inimico del bene —* * * * [https://plus.google.com/114199149796022210033] * On Wed, Jan 25, 2012 at 10:59, Gillam, Richard <[email protected]> wrote: > > The current 16-bit character strings are sometimes uses to store > non-Unicode binary data and can be used with non-Unicode character encoding > with up to 16-bit chars. 21 bits is sufficient for Unicode but perhaps is > not enough for other useful encodings. 32-bit seems like a plausable unit. > > How would an eight-digit \u escape sequence work from an implementation > standpoint? I'm assuming most implementations right now use 16-bit > unsigned values as the individual elements of a String. If we allow > arbitrary 32-bit values to be placed into a String, how would you make that > work? There seem to only be a few options: > > a) Change the implementation to use 32-bit units. > > b) Change the implementation to use either 32-bit units as needed, with > some sort of internal flag that specifies the unit size for an individual > string. > > c) Encode the 32-bit values somehow as a sequence of 16-bit values. > > If you want to allow full generality, it seems like you'd be stuck with > option a or option b. Is there really enough value in doing this? > > If, on the other hand, the idea is just to make it easier to include > non-BMP Unicode characters in strings, you can accomplish this by making a > long \u sequence just be shorthand for the equivalent sequence in UTF-16: > \u10ffff would be exactly equivalent to \udbff\udfff. You don't have to > change the internal format of the string, the indexes of individual > characters stay the same, etc. > > --Rich Gillam > Lab126 > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss >
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