Bump to lxml 3.x

[esteele]

I'd like to see us move to lxml 3.x (currently 3.4.4) before we cut the Plone 5 release. We're currently stuck on a version from 2011.

See this thread from plone-developers for some background.

At the time, the largest issue was the lack of Windows binaries. Unofficial builds are available, and since we're not doing Windows installers at the moment, this is mostly moot.

[esteele]

cssselect has now been split out of lxml proper and Plone won't run without that installed.

Looking at it, I think two of the fixes in experimental.cssselect are now also in csseelect:

• Make :contains() case sensitive for simplicity and speed looks to be fixed here
• Fix bug with ignorable spaces between css selector groups. looks to be fixed here

So the remaining one would be "use the xpath 'A//B' (short for 'A/descendant-or-self::node()/B') instead of 'A/descendant::B' for the css descendant selector ('A B').", which I haven't been able to find (and TBH, don't completely understand).

[esteele]

For that last one, running
_unicode(GenericTranslator().css_to_xpath('A B', prefix='')) through cssselector results in u'A/descendant-or-self::*/B'

[esteele]

See plone/diazo@62befdd

[tisto]

+1 Let me know if you need a jenkins job to test this...

[esteele]

@tisto: Yes, please. That'd be great.

[tisto]

@esteele done:

http://jenkins.plone.org/view/PLIPs/job/plip-lxml3
https://github.com/plone/buildout.coredev/blob/801b3bee543ea338a04efbcdc9229565c19ba3fa/plips/plip-lxml3.cfg