On Jun 5, 2007, at 6:29 AM, liorean wrote:
On 05/06/07, Maciej Stachowiak <[EMAIL PROTECTED]> wrote:
Actually, it's important for compatibility and conformance with past
specs to throw INDEX_SIZE_ERR for some (but not all) properties
specced as taking unsigned but actually passed a negative value.
Well, IE doesn't throw INDEX_SIZE_ERR, the others do, so I guess there
is that compatibility argument.
IE's DOM behavior is so divergent from the standard in so many areas
that most sites and JS libraries have two separate code paths for
much of their scripting logic.
However, I'm not only concerned with
ES3 compatibility but also with how this is supposed to work in an ES4
environment using the more advanced type system you can find in ES4.
Given ES4's compatibility goals, their DOM bindings need to behave in
a functionally equivalent way to ES3 bindings.
On 05/06/07, Maciej Stachowiak <[EMAIL PROTECTED]> wrote:
I just have to go back to my statement above. We need to investigate
current browser behavior and what past specs say, and keep in mind
that the same IDL type may in practice be mapped to a couple of
different conversion behaviors for ECMAScript. You can't decide this
based just on pure logicl
I'm not arguing for pure logic based spec where that is not compatible
with the real world, only when the real world hasn't taken a clear
stance one way or the other. I'm arguing for having the right thing
done when possible. Particularly since I would want the ES3 bindings
to be fully forward compatible with the ES4 types so that
implementations of for example CharacterData.substringData could use
an ES4 signature of:
CharacterData.substringData(offset:uint, count:uint):String
and still have correct handling of negatives.
Using this type signature would break compatibility with ES3 I guess,
since it would cause an implicit type conversion before the function
is called. In ES4 you *could* model some of these things with types
that inherit from the basic types but have different conversion rules
- I don't recall if inheriting from String or numeric types is
allowed in ES4.
Regards,
Maciej
