Le 01/11/2011 10:03, Arno Trautmann a écrit :
Hi Patrick,
thanks for your answer!
Patrick Gundlach wrote:
>> this is again a rather simple question and I am sorry for taking
your time for this …
>> In short, I want to reverse all glyph nodes in a line, and/or all
lines in a paragraph. I tried something like the following (with the
idea to store all lines in a list, then replace the lines with the list
in reversed order):
>>
>> function reverse(head)
>>
>> newlines = {}
>> i = 1
>> for line in node.traverse_id(node.id"hhead",head) do
>> newlines[i] = line
>
> a lua idiom is newlines[#newlines + 1] = ... - easer to read to the
average Lua hackr.
Oh, of course … I fear I'll never get used to this Lua style …
Or table.insert(newlines, line).
>> i = i+1
>> end
>>
>> j = #newlines
>>
>> for line in node.traverse_id(node.id"hhead",head) do
>> node.insert_before(head,line,newlines[j])
>> j = j-1
>> end
>> return head
>> end
>
> I have to admit that I don't understand exactly what is going on here.
Me neither ;)
> I never use the node.insert_* functions as they are some black magic
to me, I always change next/prev pointsers manually, so I have the
feeling of what I have to do.
But shouldn't the node.insert_* just do the same?
They do, as far as I can tell.
Alternate solution which reverse all nodes in a list:
function invert_list (h)
local l
for n in node.traverse(h) do
if l then
l = node.insert_before(l, l, node.copy(n))
else
l = node.copy(n)
end
end
node.flush_list(h)
return l
end
Best,
Paul
