On 1/9/2013 2:54 PM, Andre Caldas wrote:
Hello!
Given some
\startbuffer
Blah, blah, blah...
\stopbuffer
I'd like to get a "node tree" corresponding to how the buffer would be
processed at a given point. Using luatex, I'd like to identify certain
sub-nodes and change their attributes (to be specific: transparency).
Any hint on how to do it?
here's an example (I'll add it to the cld manual):
\starttext
\definecolor[mytransparency][a=1,t=.5]
\startluacode
local enabled = false
local count = 0
function userdata.processmystuff(head)
if enabled then
count = count + 1
for n in node.traverse(head) do
logs.report("node","run %s: %s",count,n)
if count % 2 == 0 then
nodes.tracers.transparencies.set(n,"mytransparency")
end
end
return head, true
end
return head, false
end
function userdata.enablemystuff()
enabled = true
end
function userdata.disablemystuff()
enabled = false
end
nodes.tasks.appendaction("processors", "normalizers",
"userdata.processmystuff")
\stopluacode
\startbuffer
whatever \hbox{you} want
\stopbuffer
\ctxlua{userdata.enablemystuff()}
\par \getbuffer \par
\ctxlua{userdata.disablemystuff()}
\stoptext
Also, are there any good examples on how to use "nodes"?
all over context ...
Hans
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