From: Hans Hagen <pragma@wxs.nl>
To: ntg-context@ntg.nl
Subject: Re: XML expression to read HTML classes
Date: Thu, 27 Aug 2015 22:57:04 +0200 [thread overview]
Message-ID: <55DF79A0.1040607@wxs.nl> (raw)
In-Reply-To: <2314073.gCWnhbtjGW@max>
On 8/25/2015 5:05 PM, massifr@fastwebnet.it wrote:
> Hello list,
> I'm working on HTML typesetting with ConTeXt.
> I wrote a custom expression to test whether an element has a class:
>
> function xml.functions.classes(classAttr)
> local classes = {}
> if classAttr then
> for c in string.gmatch(classAttr, "%S+") do
> if (string.len(c) > 0) then classes[c] = true end
> end
> end
> return classes
> end
>
> function xml.expressions.hasClass(classAttr, className)
> if classAttr and className then
> return xml.functions.classes(classAttr)[className] ~= nil
> end
> return false
> end
>
> This way I can write this in my xmlsetup:
> \xmlsetsetup{#1}{p[hasClass(@class,'myclass1')]}{html:p:myclass1}
>
> That is better than
> - p[@class='myclass1'] (it fails when you have more classes)
> - p[contains(@class, 'myclass1')] (it gives you false positives when you have class="myclass12")
>
> That works, but I would like to write:
> \xmlsetsetup{#1}{p[hasClass('myclass1')]}{html:p:myclass1}
>
> omitting the @class argument, because it's obvious.
> To omit it I need to access the current collected element.
>
> At page 25 of "Dealing with XML in ConTeXt MkIV" it is said
> that the predefined variables "list","l","ll" (I think I need that one)
> and "order" are available, but I did not manage to access them.
>
> How can I get the current element in Lua to write
> local classAttr = xml.attribute(currentElement, "", "class") ?
function xml.functions.classes(e)
local class = e.at.class
if class then
local classes = { }
for c in string.gmatch(class,"%S+") do
classes[c] = true
end
return classes
else
return { }
end
end
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next prev parent reply other threads:[~2015-08-27 20:57 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-25 15:05 massifr
2015-08-26 13:16 ` massifr
2015-08-27 20:57 ` Hans Hagen [this message]
2015-08-27 21:16 ` Hans Hagen
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