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Implements \mathchoice command (#969)

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This PR implements `\mathchoice` function.
I once created PR on the wrong branch. Sorry for the mess.

This is particularly useful when one defines custom macro for "big operators".
For example:

```latex
\newcommand{\infdisj}{%
  \mathop{%
    \mathchoice{% display
      \bigvee\hspace{-2ex}\bigvee%
    }{          % inline
      \bigvee\hspace{-1.75ex}\bigvee%
    }{          % script
      \bigvee\hspace{-1.4ex}\bigvee%
    }{          % scriptscript
      \bigvee\hspace{-1ex}\bigvee%
}}}
```
This commit is contained in:
Hiromi Ishii
2017-11-22 21:34:05 +09:00
committed by Erik Demaine
parent 2d32263998
commit 6f1661f7da
8 changed files with 245 additions and 0 deletions
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12
test/mathml-spec.js
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@@ -58,4 +58,16 @@ describe("A MathML builder", function() {
it('should use <menclose> for colorbox', () => {
expect(getMathML("\\colorbox{red}{b}")).toMatchSnapshot();
});
it('should render mathchoice as if there was nothing', () => {
const cmd = "\\sum_{k = 0}^{\\infty} x^k";
expect(getMathML(`\\displaystyle\\mathchoice{${cmd}}{T}{S}{SS}`))
.toMatchSnapshot();
expect(getMathML(`\\mathchoice{D}{${cmd}}{S}{SS}`))
.toMatchSnapshot();
expect(getMathML(`x_{\\mathchoice{D}{T}{${cmd}}{SS}}`))
.toMatchSnapshot();
expect(getMathML(`x_{y_{\\mathchoice{D}{T}{S}{${cmd}}}}`))
.toMatchSnapshot();
});
});