Re: Equation labels/references when converting from latex to markdown/other

[Leena Murgai <leenamurgai-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

[-- Attachment #1.1: Type: text/plain, Size: 7486 bytes --]

Currently
\ref{eq:label}
in LaTeX gives
<a href="#eq:label" data-reference-type="ref" data-reference="eq:label">[
eq:label]</a>
in HTML.

On Friday, 23 July 2021 at 16:22:24 UTC-7 Leena Murgai wrote:

> Oh and
> \ref{eq:label}
> in LaTeX should give
> <a href ="#eq:label"data-reference-type="ref" data-reference="eq:label">
> chap#.value(eq:label)</a>
> in HTML.
> On Friday, 23 July 2021 at 16:06:31 UTC-7 Leena Murgai wrote:
>
>> Thanks for the reply John.
>>
>> I've been playing around with an equation in LaTeX and seeing what comes 
>> out in HTML5 and also looking at what pandoc-crossref expects to find in 
>> the markdown. 
>>
>> LaTeX equation format:
>>   \begin{equation} \label{eq:label}
>>   equation
>>   \end{equation}
>> Note: \label{eq:label} must be inside the equation environment, above is 
>> how I do it, but equally one can place the label after equation.
>>
>> I tried moving label around in my LaTeX to see if it made a difference to 
>> the output HTML since pandoc-crossref expects to find the label after 
>> the equation environment 
>> <http://lierdakil.github.io/pandoc-crossref/#equation-labels>. Here's 
>> the HTML output in each case:
>>
>> 1. \label{eq:label} after \begin{equation}:
>>
>>   <span class="math display">\label{eq:label}equation</span>
>>
>> 2. \label{eq:label} after equation:
>>
>>   <span class="math display">equation\label{eq:label}</span>
>>
>> 3. \label{eq:label} after \end{equation}: Note that this will break the 
>> LaTeX code
>>
>>   <span class="math display">equation</span><span>[eq:label]</span>
>>
>> So, none of the above seem to give pandoc-crossref what it needs. 
>> Honestly, I'm not massively familiar with HTML and css - just figuring it 
>> out as I go. I imagine whatever pandoc-crossref would output (if I could 
>> get it to work) would be great. My quick and dirty approach (to get 
>> something like what LaTeX gives) would be to put the equation and its label 
>> in a table row. Something like
>>
>> <div>
>> <table width=100% style="border: none;">
>> <tr>
>> <td style="text-align: center; border: none;"><span id="eq:label" 
>> class="math display">equation</span></td>
>> <td style="text-align: right; border: none; width: 5%;">(chap#.value{
>> eq:label})</td>
>> </tr>
>> </table>
>> </div>
>>
>> I'm open to suggestions if hard coding 5% for the label width seems like 
>> a bad idea or some such.
>>
>> Thanks,
>> Leena
>>
>>
>>
>> On Wednesday, 21 July 2021 at 22:24:47 UTC-7 John MacFarlane wrote:
>>
>>>
>>> As I said: 
>>>
>>> Just let us know what you want to appear in the HTML, and we can 
>>> show you how to do it. 
>>>
>>>
>>>
>>> Leena Murgai <leena...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes: 
>>>
>>> > Hi John, 
>>> > 
>>> > Can you clarify your work around here? I wasn't able to follow. 
>>> > 
>>> > I have a similar problem converting from LaTeX to HTML5 - \label and 
>>> \ref 
>>> > for equations don't work. I'd be super grateful for any advice you 
>>> could 
>>> > offer. 
>>> > 
>>> > Thanks! 
>>> > Leena 
>>> > 
>>> > On Tuesday, 29 June 2021 at 11:23:40 UTC-7 John MacFarlane wrote: 
>>> > 
>>> >> 
>>> >> This isn't yet supported, really. But you might be able to 
>>> >> work around it. 
>>> >> 
>>> >> Note: 
>>> >> 
>>> >> % pandoc -f latex -t native 
>>> >> \ref{foo} 
>>> >> ^D 
>>> >> [Para [Link ("",[],[("reference-type","ref"),("reference","foo")]) 
>>> [Str 
>>> >> "[foo]"] ("#foo","")]] 
>>> >> 
>>> >> So when pandoc parses \ref{foo}, it doesn't just create a string 
>>> >> [foo]; it creates a link with attributes. You could use a lua 
>>> >> filter to turn this into something that mathjax can consume 
>>> >> (raw tex, I would imagine). 
>>> >> 
>>> >> Just let us know what you want to appear in the HTML, and we can 
>>> >> show you how to do it. 
>>> >> 
>>> >> Ian Price <ianpr...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes: 
>>> >> 
>>> >> > Hello, 
>>> >> > My university is looking into the options for converting various 
>>> notes, 
>>> >> > exercises sheets, presentations, etc. from latex generated pdf into 
>>> a 
>>> >> more 
>>> >> > accessible format. This basically means converting to html + 
>>> mathjax 
>>> >> > because this tends to work better for screen readers. Converting 
>>> beamer 
>>> >> > seems to be impossible, but for notes pandoc (and some others like 
>>> >> latexml) 
>>> >> > is generally giving good output, however the major issue is cross 
>>> >> > referencing between text and maths blocks. 
>>> >> > 
>>> >> > In short, mathjax can handle internal links from maths blocks to 
>>> other 
>>> >> > maths blocks, and pandoc can handle links to other parts of pandoc 
>>> >> > documents, except when a document makes specific reference to an 
>>> >> equation. 
>>> >> > For example, suppose we have the following mwe.tex cut out from 
>>> some 
>>> >> > electromagnetism notes 
>>> >> > --- 
>>> >> > \documentclass[12pt]{article} 
>>> >> > \begin{document} 
>>> >> > \begin{equation} 
>>> >> > J \equiv \frac{dI}{da_{\perp}} = \rho v. 
>>> >> > \label{volume-current-density} 
>>> >> > \end{equation} 
>>> >> > The total current crossing a surface $S$ can be calculated by 
>>> >> integrating 
>>> >> > Eq. (\ref{volume-current-density}): 
>>> >> > \end{document} 
>>> >> > --- 
>>> >> > When converted to markdown, we get the following 
>>> >> > --- 
>>> >> > $$J \equiv \frac{dI}{da_{\perp}} = \rho v. 
>>> >> > \label{volume-current-density}$$ 
>>> >> > 
>>> >> > The total current crossing a surface $S$ can be calculated by 
>>> >> > integrating Eq. 
>>> >> > 
>>> >> 
>>> ([\[volume-current-density\]](#volume-current-density){reference-type="ref" 
>>> >> > reference="volume-current-density"}): 
>>> >> > --- 
>>> >> > The link to the label volume-current-density is clearly broken and 
>>> when 
>>> >> I 
>>> >> > get my html file it does nothing in particular. 
>>> >> > 
>>> >> > One solution I've seen is to convert the label references to the 
>>> syntax 
>>> >> > used by, e.g., pandoc-crossref, but this involves me editing the 
>>> >> markdown 
>>> >> > by hand. Is there an automatic way to convert these? 
>>> >> > 
>>> >> > -- 
>>> >> > You received this message because you are subscribed to the Google 
>>> >> Groups "pandoc-discuss" group. 
>>> >> > To unsubscribe from this group and stop receiving emails from it, 
>>> send 
>>> >> an email to pandoc-discus...-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org 
>>> >> > To view this discussion on the web visit 
>>> >> 
>>> https://groups.google.com/d/msgid/pandoc-discuss/733e0d35-b1c4-4380-bf9f-7d6523c55162n%40googlegroups.com 
>>> >> . 
>>> >> 
>>> > 
>>> > -- 
>>> > You received this message because you are subscribed to the Google 
>>> Groups "pandoc-discuss" group. 
>>> > To unsubscribe from this group and stop receiving emails from it, send 
>>> an email to pandoc-discus...-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org 
>>> > To view this discussion on the web visit 
>>> https://groups.google.com/d/msgid/pandoc-discuss/d3a1fa02-147c-45c2-8ee1-462db48baa44n%40googlegroups.com. 
>>>
>>>
>>

-- 
You received this message because you are subscribed to the Google Groups "pandoc-discuss" group.
To unsubscribe from this group and stop receiving emails from it, send an email to pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
To view this discussion on the web visit https://groups.google.com/d/msgid/pandoc-discuss/0a0f727f-8001-40f9-84e6-4e60574b2af1n%40googlegroups.com.

[-- Attachment #1.2: Type: text/html, Size: 12571 bytes --]