[lxml-dev] matches()

[Ian Bicking]

Ian Bicking wrote:
> Ian Bicking wrote:
>> Using lxml trunk:
>>    doc.xpath('descendant-or-self::*[starts-with(lower-case(@href), 
>> "javascript:")]')
> 
> Well, maybe this one doesn't work either (returns 1/0).  Now I'm just 
> confused.

Adding to this, I'm trying to do the rel matching with:

etree.XPath("descendant-or-self::a[fn:lower-case(@rel)=$rel]")

I *have* to use fn:lower-case, not just lower-case, otherwise I get 
XPathEvalError: Unregistered function.  And it doesn't matter if I use 
it or not, it doesn't effect the outcome at all.  Similarly upper-case 
doesn't change anything.

I also tried using XPath(r'...[translate(@class, "\n\t\r", "   ")]) and 
that didn't work.  The \n etc doesn't seem to be interpreted; only if I 
include the actual characters does it work.  (I then noticed 
normalize-whitespace, which is better, but it still seems odd.)

How literals are supposed to work in XPath is rather unclear to me, I 
guess \ isn't an escape character?  The spec says use 'something'' 
if you want to include a literal ' in a string.  Which I assume in an 
XML attribute you'd have to do as 'something'', since it 
probably gets double-unescaped?  Bah.


-- 
Ian Bicking | ianb at colorstudy.com | http://blog.ianbicking.org
             | Write code, do good | http://topp.openplans.org/careers