On Jan 29, 2011 8:37 PM, "Mark Davis ☕" <[email protected]> wrote: > > There are really 5 cases at issue: > Code point breaks > Grapheme-Cluster breaks (with three possible variants: 'legacy', extended, and aksha) > Word breaks > Line breaks > Sentence breaks > Notes: > #1 is pretty trivial to do right in ES. > The others can be done in ES, but the code is more complicated -- the biggest issue is that they require a download of a possibly substantial amount of data. For certain languages, #3 requires considerable code and data.
The argument that large amounts of data must be downloaded for one language can't be used to argue that users should be forced to download that data for all languages in the world. The alternative, that the browser make use of data from the OS, is a fragmentation and testability nightmare. Fonts have similar issues. In that case we are moving to downloadable fonts. That seems like the right way to go for I18n data too. Issues of the cacheability of large font and i18n data are important but not in the scope of ES. Moving to a downloadable I18n data architecture also solves the collation order issues mentioned by Shawn recently where the front end and back end disagree on collation due to all the issues he mentioned. All those issues apply to testing and the homogeneity and testability of the web platform. > Word-breaks are different than linebreaks; the latter are the points where you can wrap a line, which may include more than a word or come in the middle of a word. > For examples, see http://unicode.org/cldr/utility/breaks.jsp. > > I don't know about the specific use cases that Jungshik had in mind, but if you are doing client-side word-processing in ES (which various software does, including ours), then you want all of these, except perhaps #5. For example, a double-click uses #3. > > There are other use cases for #4 besides word processing; for example, break up long SMS's, we break at line-boundaries. I'm not saying that someone has to do this in ES; just giving an example outside of the word-processing domain. > > Mark > > — Il meglio è l’inimico del bene — > > > On Sat, Jan 29, 2011 at 10:25, Shawn Steele <[email protected]> wrote: >> >> On the phone yesterday we mentioned word/line breaking and grapheme clusters. It didn't occur to me to ask about the use cases. >> >> >> >> Why does someone need word/line breaking in js? It seems like that would better be done by my rendering engine, like the HTML layout engine or my edit control or something? >> >> >> >> -Shawn >> >> >> >> >> >> http://blogs.msdn.com/shawnste >> >> >> >> >> _______________________________________________ >> 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 >
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