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function( extrainfo)<br />
end<br />
The string extrainfo gives some additional information about what TEX's state is with respect to the<br />
‘current page'. The possible values are:<br />
value explanation<br />
alignment a (partial) alignment is being added<br />
after_output an output routine has just finished<br />
box a typeset box is being added<br />
new_graf the beginning of a new paragraph<br />
vmode_par \par was found in vertical mode<br />
hmode_par \par was found in horizontal mode<br />
insert an insert is added<br />
penalty a penalty (in vertical mode)<br />
before_display immediately before a display starts<br />
after_display a display is finished<br />
end LuaTEX is terminating (it's all over)<br />
This callback does not replace any internal code.<br />
4.1.4.2 pre_linebreak_filter<br />
This callback is called just before LuaTEX starts converting a list of nodes into a stack of \hboxes, after<br />
the addition of \parfillskip.<br />
function( head, groupcode)<br />
return true | false | newhead<br />
end<br />
The string called groupcode identifies the nodelist's context within TEX's processing. The<br />
range of possibilities is given in the table below, but not all of those can actually appear in<br />
pre_linebreak_filter, some are for the hpack_filter and vpack_filter callbacks that will<br />
be explained in the next two paragraphs.<br />
value explanation<br />
main vertical list<br />
hbox \hbox in horizontal mode<br />
adjusted_hbox \hbox in vertical mode<br />
vbox \vbox<br />
vtop \vtop<br />
align \halign or \valign<br />
disc discretionaries<br />
insert packaging an insert<br />
vcenter \vcenter<br />
38<br />
LuaTEX Lua Libraries
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