Module showbox

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Displaying node lists in LuaTeX’s formats (TeX: The Program §173–§198, §218–§219, §986).

LuaTeX’s box display differs from TeX82’s in several places, all established by running luatex on test documents:

boxes end with , direction TLT (and so on); a shrinking glue set is printed as glue set - 1.0;
user kerns print as \kern3.0, font kerns as \kern-1.11113 (font), italic corrections as \kern2.0 (italic) and accent kerns as \kern0.0 (accent);
a discretionary prints \discretionary (penalty 50), followed by its pre-break, post-break and replacement lists, each line prefixed by the nesting string followed by .< , .> or .= ;
ligatures print their character and (ligature …) with the components;
local paragraph nodes print \localpar and four indented lines; direction nodes print \begindir TRT / \enddir TRT; boundaries print \boundary=7, \noboundary, \wordboundary=0, \protrusionboundary=5;
the short display (used by overfull/underfull box warnings and \tracingparagraphs) prints a space for any glue that is not zero, and a discretionary’s pre- and post-break texts.

Constants§