This is very useful, and was surely a lot of work. I like the general thrust of it a lot. It has a high level of backwards compatibility, does not rely on the VM having two different string implementations in it, and it seems to fix the issues people are encountering.
However I think we probably do want the /u modifier on regexps to control the new backward-incompatible behaviour. There may be some way to relax this for regexp literals in opted in Harmony code, but for new RegExp(...) and for other string literals I think there are rather too many inconsistencies with the old behaviour. The algorithm given for codePointAt never returns NaN. It should probably do that for indices that hit a trail surrogate that has a lead surrogate preceeding it. Perhaps it is outside the scope of this proposal, but it would also make a lot of sense to add some named character classes to RegExp. If we are makig a /u modifier for RegExp it would also be nice to get rid of the incorrect case independent matching rules. This is the section that says: "If ch's code unit value is greater than or equal to decimal 128 and cu's code unit value is less than decimal 128, then return ch." 2012/3/16 Norbert Lindenberg <[email protected]>: > Based on my prioritization of goals for support for full Unicode in > ECMAScript [1], I've put together a proposal for supporting the full Unicode > character set based on the existing representation of text in ECMAScript > using UTF-16 code unit sequences: > http://norbertlindenberg.com/2012/03/ecmascript-supplementary-characters/index.html > > The detailed proposed spec changes serve to get a good idea of the scope of > the changes, but will need some polishing. > > Comments? > > Thanks, > Norbert > > [1] https://mail.mozilla.org/pipermail/es-discuss/2012-February/020721.html > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss _______________________________________________ es-discuss mailing list [email protected] https://mail.mozilla.org/listinfo/es-discuss
