mirror of
https://github.com/Smaug123/KaTeX
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6f1661f7da
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%
}}}
```
74 lines
2.3 KiB
JavaScript
74 lines
2.3 KiB
JavaScript
/* global expect: false */
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/* global it: false */
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/* global describe: false */
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import buildMathML from "../src/buildMathML";
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import parseTree from "../src/parseTree";
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import Options from "../src/Options";
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import Settings from "../src/Settings";
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import Style from "../src/Style";
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const defaultSettings = new Settings({});
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const getMathML = function(expr, settings) {
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const usedSettings = settings ? settings : defaultSettings;
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let startStyle = Style.TEXT;
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if (usedSettings.displayMode) {
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startStyle = Style.DISPLAY;
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}
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// Setup the default options
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const options = new Options({
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style: startStyle,
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maxSize: Infinity,
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});
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const built = buildMathML(parseTree(expr, usedSettings), expr, options);
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// Strip off the surrounding <span>
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return built.children[0].toMarkup();
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};
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describe("A MathML builder", function() {
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it('should generate the right types of nodes', () => {
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expect(getMathML("\\sin{x}+1\\;\\text{a}")).toMatchSnapshot();
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});
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it('should make prime operators into <mo> nodes', () => {
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expect(getMathML("f'")).toMatchSnapshot();
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});
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it('should generate <mphantom> nodes for \\phantom', () => {
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expect(getMathML("\\phantom{x}")).toMatchSnapshot();
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});
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it('should use <munderover> for large operators', () => {
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expect(getMathML("\\displaystyle\\sum_a^b")).toMatchSnapshot();
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});
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it('should use <msupsub> for regular operators', () => {
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expect(getMathML("\\textstyle\\sum_a^b")).toMatchSnapshot();
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});
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it('should use <mpadded> for raisebox', () => {
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expect(getMathML("\\raisebox{0.25em}{b}")).toMatchSnapshot();
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});
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it('should use <menclose> for colorbox', () => {
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expect(getMathML("\\colorbox{red}{b}")).toMatchSnapshot();
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});
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it('should render mathchoice as if there was nothing', () => {
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const cmd = "\\sum_{k = 0}^{\\infty} x^k";
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expect(getMathML(`\\displaystyle\\mathchoice{${cmd}}{T}{S}{SS}`))
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.toMatchSnapshot();
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expect(getMathML(`\\mathchoice{D}{${cmd}}{S}{SS}`))
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.toMatchSnapshot();
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expect(getMathML(`x_{\\mathchoice{D}{T}{${cmd}}{SS}}`))
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.toMatchSnapshot();
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expect(getMathML(`x_{y_{\\mathchoice{D}{T}{S}{${cmd}}}}`))
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.toMatchSnapshot();
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});
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});
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