Comment #77 on issue 235 by [email protected]: Support the Javascript
E4X extension
http://code.google.com/p/v8/issues/detail?id=235
E4X (ECMA-357) is a dead-end standard. The future is an "E5X" that desugars
to ES5 strict or ES6 (E4X does not desugar due to filtering predicates,
which are like "with" expressions).
See
https://bugzilla.mozilla.org/show_bug.cgi?id=485791
https://bugzilla.mozilla.org/show_bug.cgi?id=627480
Implementing E4X is a lot of work. The spec is still buggy and no one wants
to fix it. Adobe and Mozilla have patched their implementations to work
around or extend away some of the design flaws. My advice for V8: wait for
an "E5X" spec or TR from Ecma, then implement.
Users of E4X in the mean time should consider how much they need the XML
parts, with or without namespaces; vs. filtering predicates (which won't
survive into any E5X); vs. other bits.
/be
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