Patrick Gundlach wrote:
Am 21.07.2011 um 14:34 schrieb Arno Trautmann:
Patrick Gundlach wrote:
Am 21.07.2011 um 14:11 schrieb Arno Trautmann:
I'd like to use the post_linebreak_filter to manipulate the node list, but only
if a macro appears in that given paragraph.
Can you use attributes there? Then you can test whether certain attributes are
in a paragraph and apply your code.
Yes, and I do in fact. But I'm not sure how this solves my problem here? Maybe
I'll be more precise on what I want to do:
I've written a function randomcolor that inserts a color whatsit before (push)
and after (pull) every glyph in a paragraph, using the post_linebreak_filter.
Now I want to provide a command \textrandomcolor{} that does the same, but only
with the text in the argument. For this, I use the same function as above, but
set an attribute at the beginning of the argument and unset it at the end, and
in the function, I test for this attribute. Fine.
That's what I wanted to write.
However, in a paragraph that does /not/ contain any \textrandomcolor, I don't
want the function to loop through all nodes. Let's say, for performance reasons
…
Does it really differ (performance wise)?
After a short test on 300 pages of blindtext, it's about 0.4s, and
actually below uncertainty …
But I might want to construct some more complex functions, and then it
may differ measureably. Besides, I just want to have nice code – that's
what LuaTeX is about, no?
(ok, Patrick is maybe the wrong person for “nice code” ;) )
cheers
Arno
