Paweł Jackowski wrote:
Taco Hoekwater wrote:
Paweł Jackowski wrote:
someglyph.next = someother
discretionary.pre = someglyph
is not the same. Why?
Hans:
indeed strange ... a quick hack is to use node.copy on b
Copying the node works in that case, thanks.
Taco:
Because a discretionary's pre, post, and replace lists are a bit
special: internally the discretionary does not just have a next and
a prev link for each of the head nodes, but also a 'tail' link.
That last one points to the last node in the list for each of
the three fields. That extra link is used during hyphenation and
at end-of-line situations (those parts of the code would be much
more complex == slower without it).
Agh, having the disc.tail link(s) at lua level would simplify processing
discretionaries a lot! Why you decided not to interface tails?
Because having them would be even more confusing than not having
them. At least, that was Nanning and my feeling about it.
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