lua filter syntax for gsub

[mingsu]

I'm new to lua filter, kindly ask for help for simple gsub usage.

In example.qmd:

---
title: "Example"
format: html
filters:
  - test
---

# Working without space

{{helloworld}}

with `test.lua`, expected to be AAA helloworld BBBB, working.

# Not-working with space

{{hello world}}

with `test.lua`, expected to be AAA hello world BBBB, but doesn't work.

In test.lua

return {
	{
		Str = function(elem)
			if elem.text:match("{{.*}}") then
				return elem.text:gsub("{{(.*)}}", "AAA %1 BBBB")
			else
				return elem
			end
		end,
	},
}

[dragonstyle]

The issue is that the space is included in the AST for Pandoc (I used quarto preview example.qmd --to native to look at the raw AST), so the second appearance of this looks like:

Para [ Str "{{hello" , Space , Str "world}}" ]

in the AST. A couple of ideas:

• You could operate on the block level (e.g. get paragraphs and walk their contents).
• These look a lot like shortcodes, have you considered simply creating a new shortcode to accomplish this? https://quarto.org/docs/extensions/shortcodes.html

In other that need to perform tasks against text ranges, I've used spans to accomplish this- so syntactically a little less terse but has other advantages. For example user could write:

[hello world]{.replace}

And then you can target spans in your filter and looks at the class names to decide what to do.

[mingsu]

Thanks!

In other that need to perform tasks against text ranges, I've used spans to accomplish this- so syntactically a little less terse but has other advantages. For example user could write:

[hello world]{.replace}

And then you can target spans in your filter and looks at the class names to decide what to do.

This is just what I want to do.

More specifically, I want to change [hello world]{.replace arguments=ARG} to \replace{ARG}{hello world} in LaTeX.

I have tried this extension quarto-ext/latex-environment.

It can parse:

[hello world]{.replace options=OPT}

to
\replace[OPT]{hello world};

But it can not parse:

[hello world]{.replace arguments=ARG}

to

\replace{ARG}{hello world};

[mcanouil]

Because the named argument arguments is not defined the way you think.
See https://github.com/quarto-ext/latex-environment/blob/main/_extensions/latex-environment/latex-environment.lua#L80-L83

arguments and options are two different parameters.