docx-equation

convert equation inside word(.docx) file to latex, current only supports omml

background

First of all, word(.docx) file is a zip file. After unziping a word file, you can get several documents. The content is mainly stored at word/document.xml.

$: unzip equation.docx
$: tree
├── equation.docx
├── [Content_Types].xml
├── docProps
│   ├── app.xml
│   └── core.xml
├── equation.docx
├── _rels
└── word
    ├── document.xml
    ├── fontTable.xml
    ├── _rels
    │   └── document.xml.rels
    └── styles.xml

There are three ways to insert a equation into word file:

1. eq field
2. omml
3. MathType

All of them are stored as markup inside docx file. You can easily find them at word/document.xml.

<m:oMath xmlns:m="http://schemas.openxmlformats.org/officeDocument/2006/math">
    <m:sSup>
        <m:e>
            <m:d>
                <m:dPr>
                    <m:begChr m:val="("/>
                    <m:endChr m:val=")"/>
                </m:dPr>
                <m:e>
                    <m:r>
                        <w:rPr>
                            <w:rFonts w:ascii="Cambria Math" w:hAnsi="Cambria Math"/>
                        </w:rPr>
                        <m:t xml:space="preserve">x</m:t>
                    </m:r>
                .......
                </m:e>
            </m:sSup>
        </m:e>
    </m:nary>
</m:oMath>

So we can just extract the equation markup out and convert it into LaTeX.

Demo

There is a demo word file named equation.docx which contains a euqation. Install requirements and run the demo.py and you will get equation.html contains the LaTeX format equation.

<p>${\left(x+a\right)}^{n}={\sum }_{k=0}^{n}\left(\begin{array}{c}n\\ k\end{array}\right){x}^{k}{a}^{n-k}$</p>