[Webkit-unassigned] [Bug 208998] JavaScript identifier grammar supports unescaped astral symbols, but JSC doesn’t

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=208998

--- Comment #2 from Keith Miller <keith_miller at apple.com> ---
Interesting our implementation seems semantically the same as v8's:

static inline bool isIdentStart(UChar32 c)
{
    return isLatin1(c) ? isIdentStart(static_cast<LChar>(c)) : isNonLatin1IdentStart(c);
}

static NEVER_INLINE bool isNonLatin1IdentStart(UChar c)
{
    return u_hasBinaryProperty(c, UCHAR_ID_START);
}

and similarly for non-start: 

static ALWAYS_INLINE bool isIdentPart(UChar32 c)
{
    return isLatin1(c) ? isIdentPart(static_cast<LChar>(c)) : isNonLatin1IdentPart(c);
}

static NEVER_INLINE bool isNonLatin1IdentPart(UChar32 c)
{
    return u_hasBinaryProperty(c, UCHAR_ID_CONTINUE) || c == 0x200C || c == 0x200D;
}

My guess is this is a bug in the system ICU. Does that analysis seem correct to you? My Unicode/ICU knowledge is very limited...

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