I consider it obvious why it makes no sense to abstract the scanner input
of the engine, and I guess this is not very good - since some of you may
not understand what it is about.
The reason it makes no sense is very simple. The scanner Sascha wrote
doesn't behave in a different way than the current scanner. Nor does it
have any drawbacks when compared to the flex scanner. It's a replacement,
that performs better and is more compatible than the C++ based flex scanner.
Now, let's imagine someone sent us a new implementation of the DOM-XML
module, which has an identical API to the last bit (perhaps with some
additions), performs faster, and is more compatible. Would we add
DOM-XML-NG, and let people choose? Of course not, because it's a plain
dumb thing to do. The old DOM-XML extension will be removed and the new
one would take its place.
The scanner case is similar, except it's a much more fundamental component,
which makes even *less* sense to abstract. Abstracting it gives *nothing*
from a technical point of view. The single reason Sascha did that, was
because he is not happy with the Zend Engine license, and doesn't want to
submit it the way it is, to make a point.
I've been discussing the Zend Engine license with the 'leaders' of the
German PHP community on Thursday, and with members of the community and the
PHP Group on Friday. As mentioned there, the Zend Engine license is being
reviewed, and may change in the next few months. Especially in the light
of this, I see Sascha's changes as making even less sense than what they
would have made before, and that wasn't too much to begin
with. Abstracting the scanner buys you *nothing* from a technical point of
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