Xml - lua - context

Xml - lua - context

[Thomas A. Schmitz via ntg-context]

Dear all,

For a small project, I have two questions (without MWE…) on processing xml via Lua and context. I’ll write two messages so eager volunteers can reply more easily!

So question one: given an xml structure like this

  <section>
    <sectiontitle>
      Introduction: the <em>Iliad</em>
    </sectiontitle>
    <sectionlist>
      Introduction: the <em>Iliad</em>
    </sectionlist>
  </section>

I want to typeset the section title with some added information. Since I’m processing in a loop, I thought this would be easier in Lua, so I have something like this:

local i = 0

local sessions = { “April 2”, “April 9”, “April 16” } -- etc.

function xml.functions.section(t)
	i = i + 1
	local raw_section = xml.text (t, "/sectiontitle")
	local section_head = i .. ". session, " .. sessions [i] .. ": " .. raw_section
	context.startsection { title=section_head }
	lxml.flush (t)
	context.stopsection ()
end

However, this means that the section_head is serialized as a string and not processed according to the xml setups, so I have “the <em>Iliad</em>” in my typeset document. How can this be avoided? How can I have the <em>...</em> processed instead of serialized in the section title? 

Thanks for looking at my code!

Thomas
___________________________________________________________________________________
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wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Xml - Lua - context

[Thomas A. Schmitz via ntg-context]

> On 28. Mar 2022, at 18:21, Adam Reviczky via ntg-context <ntg-context@ntg.nl> wrote:
> 
> Hi Thomas,
> 
> Not sure whether it helps or not, but in regards to combinations and Lua I have had some challenges as well, but Hans' and Wolfgangs' solution with externalfigures works fine for me now:
> 
> https://mailman.ntg.nl/pipermail/ntg-context/2021/103822.html
> https://mailman.ntg.nl/pipermail/ntg-context/2021/103827.html
> 
> Adam


Thank you, that’s already very useful! I should have looked if there is a “delayed” alternative for externalfigure as well, but I also take Hans’s warning to heart that all of this is non-trivial. 

Thank you, best wishes

Thomas
___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
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___________________________________________________________________________________

Re: Xml - Lua - context

[Adam Reviczky via ntg-context]

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Hi Thomas,

Not sure whether it helps or not, but in regards to combinations and Lua I
have had some challenges as well, but Hans' and Wolfgangs' solution with
externalfigures works fine for me now:

https://mailman.ntg.nl/pipermail/ntg-context/2021/103822.html
https://mailman.ntg.nl/pipermail/ntg-context/2021/103827.html

Adam

On Mon, Mar 28, 2022 at 2:42 PM Thomas A. Schmitz via ntg-context <
ntg-context@ntg.nl> wrote:

> And here comes question 2, a very basic one: on A4 landscape pages, I want
> to place two images next to each other (like the spread pages of a book).
> What would be the preferred way of the really competent users to do this,
> again keeping in mind that I want to loop over page numbers in a pdf file
> and thus am coding in Lua. So far, I have tried or thought about:
>
> 1. Embedded xtable
>
> This is what I’m using now, an xtable of two columns for every A4 page. It
> works, but I wonder if it’s a good method.
>
> 2. combinations
>
> This appeared to be the most natural approach (because it’s what
> combinations are for), but I ran into expansion problems, added a few
> “function () end” in my code, but couldn’t make it compile. Combinations,
> combined with framed and externalfigure, are difficult to write in Lua - or
> am I too stupid to find the winning combination (sorry for the puns).
>
> 3. columns
>
> Again, this would seen like a natural approach, having every A4 page set
> up as two columns, but maybe that’s overkill?
>
> I’d be curious to know what you think!
>
> All best
>
> Thomas
>
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to
> the Wiki!
>
> maillist : ntg-context@ntg.nl /
> http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
>
> ___________________________________________________________________________________
>

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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Xml - Lua - context

[Thomas A. Schmitz via ntg-context]

And here comes question 2, a very basic one: on A4 landscape pages, I want to place two images next to each other (like the spread pages of a book). What would be the preferred way of the really competent users to do this, again keeping in mind that I want to loop over page numbers in a pdf file and thus am coding in Lua. So far, I have tried or thought about:

1. Embedded xtable

This is what I’m using now, an xtable of two columns for every A4 page. It works, but I wonder if it’s a good method.

2. combinations

This appeared to be the most natural approach (because it’s what combinations are for), but I ran into expansion problems, added a few “function () end” in my code, but couldn’t make it compile. Combinations, combined with framed and externalfigure, are difficult to write in Lua - or am I too stupid to find the winning combination (sorry for the puns).

3. columns

Again, this would seen like a natural approach, having every A4 page set up as two columns, but maybe that’s overkill? 

I’d be curious to know what you think!

All best

Thomas
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________