The `subtype` field of a `glyph` node is a bit field

[lemzwerg]

For the input

\input nodetree.tex
\NodetreeSetOption[verbosity]{2}

\NodetreeRegisterCallback{preline}

office

\bye

before:

after:

[Josef-Friedrich]

Thank you for your pull request ... I had to resolve a merge conflict ... now all glyph subtypes are gone ... Can you please look at the current main branch

[lemzwerg]

This works for me.

diff --git a/nodetree.lua b/nodetree.lua
index 6b907b8..35d1ada 100644
--- a/nodetree.lua
+++ b/nodetree.lua
@@ -948,6 +948,10 @@ function node_extended.subtype(n)
       -- only handle the lowest five bits
       local mask = 1
       local need_space = false
+      if n.subtype & mask == 0 then
+        output = output .. 'glyph'
+        need_space = true
+      end
       for i = 0,4,1 do
         if n.subtype & mask ~= 0 then
           if need_space == true then

[Josef-Friedrich]

With your patch all the subtypes of the glyphs are “glyphs”. I had to revert your pull request. Sorry.

[lemzwerg]

This is fully correct, see the LuaTeX manual, section 5.2, 'Characters, glyphs and discretionaries'! At the 'preline' stage, all input characters are already converted to glyphs (see the 'hyphenate' state to see characters); only in ligatures you can find retained references to input characters.

Anyway, I've opened #15 for a better patch.