On 7/14/2017 8:26 PM, Ulrike Fischer wrote:
Am Fri, 14 Jul 2017 19:20:38 +0200 schrieb Hans Hagen:


local kern_injector = function (fillup, kern)
    if fillup then
      local g = new_glue(kern)
      local s = getfield(g, "spec")
      setfield(s, "stretch", kern)
      setfield(s, "stretch_order", 1)
      return g
    end
    return new_kern(kern)
end

yes, i decided to limit the dependencies ... (also because the kern
allocator was a plug outside context)

you can use:

    local new = node.direct.new

    local g = new("glue")
    setfield(g, "stretch", kern)
    setfield(g, "stretch_order", 1)

And what I should do about the "return new_kern(kern)"?

local g = new("kern")
setfield(g,"kern",kern)

I tried various variants and got results from no letterspacing to
"invalid node type id" to " This can't happen (invalid node found in
discretionary)." to a luatex crash:

you can't put glue in discs so your letterspacing code should use kerns, not glue

-- UF changed 2017-07-14
local new = node.direct.new

local kern_injector = function (fillup, kern)
  if fillup then
    local g = new("glue")
    setfield(g, "stretch", kern)
    setfield(g, "stretch_order", 1)
    return g
  end
  --return new_kern(kern) --??
  --
end
--




--

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