Allen Wirfs-Brock wrote:
Any input from our other Unicode experts would be appreciated...
Here's what I found (running on Windows Vista):
IE, FF, Opera
"\u00DF".toUpperCase() returns "\u00DF"
Safari, Chrome
"\u00DF".toUpperCase() returns "SS"
It would be interesting if somebody could try the above for FF and Opera on a
non-Windows machine to check whether this is a byproduct of using the Windows
provided conversion routines.
Question 1: Is the specified length invariant essential or just noise in the
ES3 spec. If it's not we could could eliminate that invariant and say that each
S character is replaced in the result by the corresponding character(s) from
the Unicode case mappings.
Question 2: If the observed variance is indeed a result of using the Windows
mapping do we really want to require every implementation to provide its own
internal mappings data and algorithms (as Safari and Chrome may be doing) if
the underlying host is not fully Unicode compliant?
Question 3: Do we need to explicitly provide for some implementation variance
here. That appears to be the current reality of the web. Do we want to try to
stamp out the variance or to acknowledge and allow it.
Question 4: Is Chrome correct with:
"\u03A3\u03A3".toLowerCase() == σς, not σσ
And everybody else is wrong? This sounds like a reasonable interpretation of
the explicit mention of SpecialCasing.txt in the note (but that the note is not
normative). If so, should be explicit mention in step 3 that the translation
must be appropriately context sensitive.
Finally, is any of the above going to actually influence anything. If not,
maybe carrying the exact ES3 specification forward is ok.
The reason the ES3 specification was the way it was is because converting one
character to many during case conversions would be incompatible with regular
expressions. The regular expression algorithm refers to
String.prototype.toUpperCase.
Waldemar
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