On Oct 23, 2013, at 3:09 PM, Nebojša Ćirić wrote: > String.prototype.normalize(form) spec is here - > http://people.mozilla.org/~jorendorff/es6-draft.html#sec-string.prototype.normalize. > It offers all 4 forms of normalization. > > We did mention additional CF and CFNKFC forms for case folding, but they were > not added to the spec. They case fold string in a locale independant way (see > http://www.unicode.org/faq/casemap_charprop.html#2). > > Should we: > 1. Add those two new forms to the spec of String.prototype.normalize(form) > method? > 2. Add a new String.prototype.toFoldCase(form) method? > 3. Add Intl.Collator.prototype.sortKey(string)->string method? > > We could do 1 and 3, or 2 and 3, or just 3. > > Use case would be: user inputs M words, and we would like to see if some of > them match N predefined words (say to trigger an action). With current > Intl.Collator.prototype.compare() we need MxN comparisons. With > toFoldCase/sortKey we would need only O(M) queries to the hash with N keys. > > Mihai and I lean towards 3. because it gives more control to the user on what > you want to check. For example, it doesn't make sense to ignoreCase for > locales that don't have case distinction. Or user may want to preserve > accents in the comparison... > > -- > Nebojša Ćirić > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss
Also see http://people.mozilla.org/~jorendorff/es6-draft.html#sec-string.prototype.tolowercase In my working draft, the paragraph that immediately follows the algorithm has been modified to read: The result must be derived according to the *locale-insensitive* case mappings in the Unicode Character Database (this explicitly includes not only the UnicodeData.txt file, but also *all locale-insensitive mappings in* the SpecialCasings.txt file that accompanies it). This change is in response to https://bugs.ecmascript.org/show_bug.cgi?id=206 Does this sufficiently cover the locale independent case folding use case? Allen
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