Raw LaTeX: {} at the end

Raw LaTeX: {} at the end

[Axel Rauschmayer]

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In LaTeX, you occasionally use macros like this:

namespace\fshyp{}container


Problem: My filter (for HTML) only receives the raw LaTeX \fshyp (without 
the curly braces).

   - Would it make sense to change this parsing behavior of Pandoc?
   - Work-around (which is a bit ugly): namespace`\fshyp{}`{=latex}container

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Re: Raw LaTeX: {} at the end

[John MacFarlane]

Is this a macro with one argument, and you're passing
in an empty argument?  Or are you just using `{}` to
separate `\fshyp` from the following word?

Axel Rauschmayer <rauschma-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> In LaTeX, you occasionally use macros like this:
>
> namespace\fshyp{}container
>
>
> Problem: My filter (for HTML) only receives the raw LaTeX \fshyp (without 
> the curly braces).
>
>    - Would it make sense to change this parsing behavior of Pandoc?
>    - Work-around (which is a bit ugly): namespace`\fshyp{}`{=latex}container
>
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Re: Raw LaTeX: {} at the end

[Axel Rauschmayer]

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The latter. But the former also seems like it could happen.

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Re: Raw LaTeX: {} at the end

[BPJ]

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Supposing that you mean how to enter the raw LaTeX into the markdown I
always just use `\foo{}bar`. It gives the expected result, i.e. the braces
become part of the raw TeX inline:

````native
[Para [RawInline (Format "tex") "\\foo{}",Str "bar"]]
````

The empty braces should always be harmless, or aren't they?

Or do you experience/expect something else?

/bpj

Den mån 8 apr. 2019 21:25Axel Rauschmayer <rauschma-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> skrev:

> The latter. But the former also seems like it could happen.
>
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Re: Raw LaTeX: {} at the end

[Axel Rauschmayer]

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I’ve switched to a different approach now. But in principle, the problem is 
that I always target both LaTeX and HTML. With the latter, I don’t want to 
have the empty braces.

Example:

INPUT: foo\bar{}baz
AST: [Para [Str "foo",RawInline (Format "tex") "\\bar",Str "{}baz"]]

Here, I can’t use my own Lua filter to implement \bar{} for HTML, because 
that filter will miss the empty braces.

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Re: Raw LaTeX: {} at the end

[John MacFarlane]

I think it would be reasonable to include the {} in
the tex.  You are welcome to open an issue about this.

You can also use the raw attribute:

   `\foo{}`{=latex}

Axel Rauschmayer <rauschma-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> The latter. But the former also seems like it could happen.
>
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Re: Raw LaTeX: {} at the end

[BPJ]

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For me the braces are included in the TeX. The example I posted earlier
today was generated with

http://pandoc.org/try/?text=%5Cfoo%7B%7Dbar&from=markdown&to=native

also with the braces included in the TeX.


Den tis 9 apr. 2019 16:41John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> skrev:

>
> I think it would be reasonable to include the {} in
> the tex.  You are welcome to open an issue about this.
>
> You can also use the raw attribute:
>
>    `\foo{}`{=latex}
>
> Axel Rauschmayer <rauschma-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > The latter. But the former also seems like it could happen.
> >
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Re: Raw LaTeX: {} at the end

[Axel Rauschmayer]

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>
> For me the braces are included in the TeX. The example I posted earlier 
> today was generated with 


> http://pandoc.org/try/?text=%5Cfoo%7B%7Dbar&from=markdown&to=native
>
> also with the braces included in the TeX.
>

 Yes! My example is 
different: http://pandoc.org/try/?text=foo%5Cbar%7B%7Dbaz&from=markdown&to=native

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Re: Raw LaTeX: {} at the end

[BPJ]

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I definitely consider the different behavior in these two cases a bug, and
I also consider including the braces in the TeX to be the only sensible
behavior.

Den tis 9 apr. 2019 18:32Axel Rauschmayer <rauschma-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> skrev:

> For me the braces are included in the TeX. The example I posted earlier
>> today was generated with
>
>
>> http://pandoc.org/try/?text=%5Cfoo%7B%7Dbar&from=markdown&to=native
>>
>> also with the braces included in the TeX.
>>
>
>  Yes! My example is different:
> http://pandoc.org/try/?text=foo%5Cbar%7B%7Dbaz&from=markdown&to=native
>
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Re: Raw LaTeX: {} at the end

[John MacFarlane]

This is crazy!

http://pandoc.org/try/?text=%5Cfoo%7B%7Dbar%0A%0A%5Cbar%7B%7Dbaz%0A&from=markdown&to=native

The only difference between these is whether the
string is foo or bar.  I can't see how that could
possibly cause different parsing!

Anyway, someone should submit an issue with this case.

Re: Raw LaTeX: {} at the end

[Axel Rauschmayer]

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GitHub issue: https://github.com/jgm/pandoc/issues/5439

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Re: Raw LaTeX: {} at the end

[John MacFarlane]

Ah, I see what is going on.

\bar is already a supported inline command in the LaTeX
reader. And this command doesn't take arguments.  That's why
the {} isn't included, but is with \foo.

One could still argue that in parsing raw LaTeX one
should always absorb a following {}.

Re: Raw LaTeX: {} at the end

[BPJ]

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Yes one should because adding an empty group is a common strategy to avoid
having to insert a space which will be gobbled, and with pandoc you pretty
much have to do it since a following space will be parsed as a Space, but
in the output TeX will gobble that space anyway unless you protect it with
an empty group.

Den tis 9 apr. 2019 19:06John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> skrev:

>
> Ah, I see what is going on.
>
> \bar is already a supported inline command in the LaTeX
> reader. And this command doesn't take arguments.  That's why
> the {} isn't included, but is with \foo.
>
> One could still argue that in parsing raw LaTeX one
> should always absorb a following {}.
>
>

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Re: Raw LaTeX: {} at the end

[John MacFarlane]

BPJ <melroch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> Yes one should because adding an empty group is a common strategy to avoid
> having to insert a space which will be gobbled, and with pandoc you pretty
> much have to do it since a following space will be parsed as a Space, but
> in the output TeX will gobble that space anyway unless you protect it with
> an empty group.


Not so, at least not with the current version!

% pandoc -t native
\my tex
[Para [RawInline (Format "tex") "\\my ",Str "tex"]]

Re: Raw LaTeX: {} at the end

[BPJ]

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Yes but *LaTeX* will eat the space eventually unless it is protected.

Den tis 9 apr. 2019 20:44John MacFarlane <jgm-TVLZxgkOlNX2fBVCVOL8/A@public.gmane.org> skrev:

> BPJ <melroch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > Yes one should because adding an empty group is a common strategy to
> avoid
> > having to insert a space which will be gobbled, and with pandoc you
> pretty
> > much have to do it since a following space will be parsed as a Space, but
> > in the output TeX will gobble that space anyway unless you protect it
> with
> > an empty group.
>
>
> Not so, at least not with the current version!
>
> % pandoc -t native
> \my tex
> [Para [RawInline (Format "tex") "\\my ",Str "tex"]]
>
>

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Re: Raw LaTeX: {} at the end

[John MacFarlane]

BPJ <melroch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> Yes but *LaTeX* will eat the space eventually unless it is protected.

Right, that's the point. There won't be a space with

    aaa\foo bbb

so you could just use this form instead of

    aaa\foo{}bbb

Re: Raw LaTeX: {} at the end

[Axel Rauschmayer]

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Ah, amazing – I didn’t even consider that changing the command name could 
have an effect, but it does (I thought it was about text preceding the 
command):

namespace\fshyp{}container
[Para [Str "namespace",RawInline (Format "tex") "\\fshyp",Str 
"{}container"]]

namespace\aaa{}container
[Para [Str "namespace",RawInline (Format "tex") "\\aaa{}",Str "container"]]

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