docx to html conversion: aligned equations not working

[davidmckinnon]

I am converting docx to html using pandoc (v2.9.1) called from conda Python (3.7.1).

I have attached two examples of aligned equations in a docx file where I have aligned them at the equality sign within the Word document.
testmath.docx

The Latex code lacks the \begin{aligned} ... \end{aligned} words, lacks the decorated equality sign '&=' needed for alignment, and the line breaks are not properly implemented.

[jgm]

Here's what the XML looks like for the first two equations. The aligning is done by m:aln in m:rPr.

      <m:oMathPara>
        <m:oMath>
          <m:sSub>
            <m:sSubPr>
              <m:ctrlPr>
                <w:rPr>
                  <w:rFonts w:ascii="Cambria Math"
                  w:hAnsi="Cambria Math" />
                  <w:i />
                </w:rPr>
              </m:ctrlPr>
            </m:sSubPr>
            <m:e>
              <m:r>
                <w:rPr>
                  <w:rFonts w:ascii="Cambria Math"
                  w:hAnsi="Cambria Math" />
                </w:rPr>
                <m:t>E</m:t>
              </m:r>
            </m:e>
            <m:sub>
              <m:r>
                <w:rPr>
                  <w:rFonts w:ascii="Cambria Math"
                  w:hAnsi="Cambria Math" />
                </w:rPr>
                <m:t>Na</m:t>
              </m:r>
            </m:sub>
          </m:sSub>
          <m:r>
            <m:rPr>
              <m:aln />
            </m:rPr>
            <w:rPr>
              <w:rFonts w:ascii="Cambria Math"
              w:hAnsi="Cambria Math" />
            </w:rPr>
            <m:t xml:space="preserve">
=61.5 
</m:t>
          </m:r>
          <m:r>
            <m:rPr>
              <m:sty m:val="p" />
            </m:rPr>
            <w:rPr>
              <w:rFonts w:ascii="Cambria Math"
              w:hAnsi="Cambria Math" />
            </w:rPr>
            <m:t>mV</m:t>
          </m:r>
          <m:r>
            <w:rPr>
              <w:rFonts w:ascii="Cambria Math"
              w:hAnsi="Cambria Math" />
            </w:rPr>
            <m:t xml:space="preserve">
 
</m:t>
          </m:r>
          <m:r>
            <m:rPr>
              <m:sty m:val="p" />
            </m:rPr>
            <w:br />
          </m:r>
        </m:oMath>
        <m:oMath>
          <m:sSub>
            <m:sSubPr>
              <m:ctrlPr>
                <w:rPr>
                  <w:rFonts w:ascii="Cambria Math"
                  w:hAnsi="Cambria Math" />
                  <w:i />
                </w:rPr>
              </m:ctrlPr>
            </m:sSubPr>
            <m:e>
              <m:r>
                <w:rPr>
                  <w:rFonts w:ascii="Cambria Math"
                  w:hAnsi="Cambria Math" />
                </w:rPr>
                <m:t>E</m:t>
              </m:r>
            </m:e>
            <m:sub>
              <m:r>
                <w:rPr>
                  <w:rFonts w:ascii="Cambria Math"
                  w:hAnsi="Cambria Math" />
                </w:rPr>
                <m:t>Na</m:t>
              </m:r>
            </m:sub>
          </m:sSub>
          <m:r>
            <m:rPr>
              <m:aln />
            </m:rPr>
            <w:rPr>
              <w:rFonts w:ascii="Cambria Math"
              w:hAnsi="Cambria Math" />
            </w:rPr>
            <m:t xml:space="preserve">
=61.5 
</m:t>
          </m:r>
          <m:r>
            <m:rPr>
              <m:sty m:val="p" />
            </m:rPr>
            <w:rPr>
              <w:rFonts w:ascii="Cambria Math"
              w:hAnsi="Cambria Math" />
            </w:rPr>
            <m:t>mV</m:t>
          </m:r>
          <m:r>
            <w:rPr>
              <w:rFonts w:ascii="Cambria Math"
              w:hAnsi="Cambria Math" />
            </w:rPr>
            <m:t xml:space="preserve">
 
</m:t>
          </m:r>
          <m:r>
            <m:rPr>
              <m:sty m:val="p" />
            </m:rPr>
            <w:br />
          </m:r>
        </m:oMath>

[jgm]

The omml parser for texmath currently ignores the m:aln property.

[jgm]

See the tex parser's treatment of align environments to see how this is handled. (A tabular is generated.)

[davidmckinnon]

I currently fix the latex code that is generated by pandoc using post-processing with Python. This is satisfactory for me but aligned equations are pretty common so it would seem like it is something that should be handled. Not sure if it is priority. I would offer to help but I don't know the first thing about either OMML or Haskell.