how to simulate \hss in luametatex?
Hi list, 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 ``` should get 'b' on top of 'a', as follows: ```pdf b ac ``` and in lua, I see a <glue userskip> before "b" node, width width:0, stretch:65536, shrink:65536, stretchorder:2, shrinkorder:2 And in lua, I do as follows(part of my app seen in attachment): ```lua local hss = node_new(glue_id) hss.stretch = 65536 hss.stretchorder = 2 hss.shrink = 65536 hss.shrinkorder = 2 hss.width = 0 list,_ = node_insertbefore(list, list, hss) -- b is in the list -- I got a <glue userskip> with width:0, stretch:65536, shrink:65536, stretchorder:2, shrinkorder:2 local box = node_new(hlist_id, "box") box.head = list box.width = 0 box.shift = -tex_sp("1ex") -- I got <hlist box> width:0 height:0 deep:0 shift: -503424 head, current = node_insertbefore(head,current, box) -- current is 'c' node ``` And got 'b' on top of 'c' in pdf as follows: ```pdf b ac ``` How can I get 'b' on top of 'a' as \hss do? ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context webpage : https://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : https://contextgarden.net ___________________________________________________________________________________
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 -- Max
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 -----------------------------------------------------------------
Hans,
thank you.
By your and Max's answers, I understand that
there must be box.glueset for the glues in the box.list to actually work.
Best regards
Huang Fusyong(黄复雄)
Hans Hagen via ntg-context
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 -----------------------------------------------------------------
___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context webpage : https://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : https://contextgarden.net ___________________________________________________________________________________
Dear Max, I am very grateful that you took the time to tweak and test my non-running code snippet and found the problem.
local box = node.hpack(hss + b, "exactly", 0)
You are absolutely right, the cause of the problem was that I wasn't
using node.hpack().
Actually, I tried to use it, but used it wrong, as follows:
local box, _ = node_hpack(list)
box.width = 0
box.shift = -tex_sp("1ex")
My app works fine now. Also, I learned a lot from your code, like
font.current(), hss + b
and tex.forcehmode() - I immediately used the last one to set
box.shift, making it relative.
Best regards
Huang Fusyong(黄复雄)
Max Chernoff via ntg-context
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
-- Max
___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / https://www.ntg.nl/mailman/listinfo/ntg-context webpage : https://www.pragma-ade.nl / http://context.aanhet.net archive : https://bitbucket.org/phg/context-mirror/commits/ wiki : https://contextgarden.net ___________________________________________________________________________________
participants (3)
-
Hans Hagen -
Max Chernoff -
黄复雄