unexpected Tok "source" Symbol "_" when reading latex

[gtheler]

The following (valid) LaTeX input (call it mwe.tex)

donde~$\rho$ es la densidad del acero, $\rho_\text{D$_2$O}=\SI{866}{\kilogram\per\cubic\meter}$ la densidad del agua pesada a~$\SI{250}{\celsius}$, y $r_i$ y $r_o$ los radios internos y externos respectivamente.

fails with the following error

$ pandoc mwe.tex 

Error at "source" (line 1, column 54):
unexpected Tok "source" (line 1, column 54) Symbol "_"
expecting end of input
donde~$\rho$ es la densidad del acero, $\rho_\text{D$_2$O}=\SI{866}{\kilogram\per\cubic\meter}$ la densidad del agua pesada a~$\SI{250}{\celsius}$, y $r_i$ y $r_o$ los radios internos y externos respectivamente.
                                                     ^
$

Latest debian package was used:

$ pandoc -v
pandoc 2.1.3
Compiled with pandoc-types 1.17.4.2, texmath 0.10.1.1, skylighting 0.7.0.2
Default user data directory: /home/gtheler/.pandoc
Copyright (C) 2006-2018 John MacFarlane
Web:  http://pandoc.org
This is free software; see the source for copying conditions.
There is no warranty, not even for merchantability or fitness
for a particular purpose.

This bug error was first posted in the pandoc-discuss mailing list and jgm did confirm it was a bug.

[jgm]

It's okay, this was reported first on pandoc-discuss and is diagnosed there. The problem is that the latex parser tries to identify a math section in a way that ignores the possibility that `$` may occur inside `\text{..}` in math.

[jgm]

There is still a residual issue, shown by the following:

% pandoc -f latex --mathml
$\SI{866}{\kilogram\per\cubic\meter}$
[WARNING] Could not convert TeX math '\SI{866}{\kilogram\per\cubic\meter}', rendering as TeX:
  \SI{866}{\kilogram\per\cubic\meter}
     ^
  unexpected "{"
  expecting "%", "\\label", "\\nonumber" or whitespace
<p><span class="math inline">$\SI{866}{\kilogram\per\cubic\meter}$</span></p>

This is really an issue in jgm/texmath, which doesn't support the \SI command. Feel free to open an issue about this there.

[gtheler]

thanks for your time