On 11/05/2010 01:59 PM, Manuel Pégourié-Gonnard wrote:
Hi,Sorry if this is very clear from the manual, maybe I just didn't read the part where it is explained (or I read it but was too stupid/tired to notice), but I don't understand the meaning of the return value of some callbacks. The first example (by order of apparition in the manual) is pre_linebreak_filter, whose calling convention is: function(<node> head,<string> groupcode) return true | false |<node> newhead end I think it's clear what returning a newhead node does, but I don't understand what returning true or false means for this callback. Other similar callbacks include post_linebreak_filter, (h|v)pack_filter, pre_output_filter, etc.
In all these cases the result of returning a boolean is the same: false == callback has failed true == callback has run ok, but nothing has been changed the latter case (true) is interesting because it allows a speed optimization that can be considerable. I could have sworn this was mentioned in the manual, but I cannot find it myself either. _______________________________________________ dev-luatex mailing list dev-luatex@ntg.nl http://www.ntg.nl/mailman/listinfo/dev-luatex
