On 11/11/2022 10:53 AM, Max Chernoff via ntg-context wrote:
Hi,
I want to simulate \hss in lua end in ConTeXt/luametatex environment. For example,
```ConTeXt a{\raise 1.5ex\hbox to 0pt{\hss b}}c ```
And in lua, I do as follows(part of my app seen in attachment):
Your code doesn't compile as is. I think that this is the same thing though:
\starttext \startluacode local a = node.new"glyph" a.char = string.byte("a") a.font = font.current()
local b = node.new"glyph" b.char = string.byte("b") b.font = font.current()
local c = node.new"glyph" c.char = string.byte("c") c.font = font.current()
local hss = node.new("glue") hss.stretch = 65536 hss.stretchorder = 2 hss.shrink = 65536 hss.shrinkorder = 2 hss.width = 0 b = node.insertbefore(b, b, hss)
local box = node.new("hlist", "box") box.head = b box.width = 0 box.shift = -tex.sp("1ex")
tex.forcehmode() node.write(a + box + c) \stopluacode \stoptext
And got 'b' on top of 'c' in pdf as follows:
```pdf b ac ```
The \hss isn't the problem here. The problem is actually with the box. When you manually make the \hbox like that, I think (although I could be wrong) that you're bypassing all of TeX's glue calculations. You should probably use "node.hpack" instead:
\starttext \startluacode local a = node.new"glyph" a.char = string.byte("a") a.font = font.current()
local b = node.new"glyph" b.char = string.byte("b") b.font = font.current()
local c = node.new"glyph" c.char = string.byte("c") c.font = font.current()
local hss = node.new("glue") hss.stretch = 65536 hss.stretchorder = 2 hss.shrink = 65536 hss.shrinkorder = 2 hss.width = 0
local box = node.hpack(hss + b, "exactly", 0) box.shift = -tex.sp("1ex")
tex.forcehmode() a.next = box box.next = c node.write(a) \stopluacode \stoptext indeed, an dafter that you can check it
box.glueorder : 2 box.glueset : 6.6683349609375 box.gluesign : 2 which will be applied (in the backend) to glues Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl -----------------------------------------------------------------