Extra paragraphs when convert LaTeX to HTML+MathML

[rgaiacs]

Summary

In LaTeX, a empty line marks the end of one paragraph and the begin of another. This rule also apply for math environments like equation, align, ...

Steps to Reproduce

$ cat sample.tex
begin of paragraph
\begin{equation}
a^2 + b^2 = c^2
\end{equation}
end of paragraph.
$ pandoc --version | head -n 1
pandoc 1.13.2
$ pandoc -f latex -t html --mathml sample.tex

Actual Results

Three paragraphs were created:

<p>begin of paragraph</p>
<p><math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msup><mi>a</mi><mn>2</mn></msup><mo>+</mo><msup><mi>b</mi><mn>2</mn></msup><mo>=</mo><msup><mi>c</mi><mn>2</mn></msup></mrow><annotation encoding="application/x-tex">a^2 + b^2 = c^2</annotation></semantics></math></p>
<p>end of paragraph.</p>

Expected Results

Only one paragraph was created:

<p>begin of paragraph <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msup><mi>a</mi><mn>2</mn></msup><mo>+</mo><msup><mi>b</mi><mn>2</mn></msup><mo>=</mo><msup><mi>c</mi><mn>2</mn></msup></mrow><annotation encoding="application/x-tex">a^2 + b^2 = c^2</annotation></semantics></math> end of paragraph.</p>

Aditional information

When I use $$ I get the correct behavior.

$ cat sample.tex
begin of paragraph
$$a^2 + b^2 = c^2$$
end of paragraph.
$ pandoc --version | head -n 1
pandoc 1.13.2
$ pandoc -f latex -t html --mathml sample.tex
<p>begin of paragraph <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msup><mi>a</mi><mn>2</mn></msup><mo>+</mo><msup><mi>b</mi><mn>2</mn></msup><mo>=</mo><msup><mi>c</mi><mn>2</mn></msup></mrow><annotation encoding="application/x-tex">a^2 + b^2 = c^2</annotation></semantics></math> end of paragraph.</p>

[mpickering]

In pandoc all environments which start with \begin{...} are parsed as block level elements. Math is an inline element so has to be lifted to the block level and this is done using the extra Para element.

[jgm]

I think I came up with a fairly simple fix, which will cause
\begin{equation}...\end{equation} and the like to be
included in a display math inline inside a paragraph when
possible, rather than creating a new paragraph.

+++ Matthew Pickering [Dec 16 14 11:18 ]:

In pandoc all environments which start with \begin{...} are parsed as
block level elements. Math is an inline element so has to be lifted to
the block level and this is done using the extra Para element.

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References

1. Extra paragraphs when convert LaTeX to HTML+MathML #1821 (comment)