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Don't add invisible funciton apply after an empty mathop #1341

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Don't add invisible funciton apply after an empty mathop #1341

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a1447d2
Don't add invisible funciton apply after an empty mathop
dpvc Sep 1, 2025
9882a85
Update formatting for prettier
dpvc Sep 3, 2025
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27 changes: 27 additions & 0 deletions testsuite/tests/input/tex/Base.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -12198,6 +12198,33 @@ describe('Character Class Changes', () => {

/********************************************************************************/

it('Mathop Apply', () => {
toXmlMatch(
tex2mml('\\mathop{F} x'),
`<math xmlns="http://www.w3.org/1998/Math/MathML" data-latex="\\mathop{F} x" display="block">
<mrow data-mjx-texclass="OP" data-latex="\\mathop{F}">
<mi data-latex="F">F</mi>
</mrow>
<mo data-mjx-texclass="NONE">&#x2061;</mo>
<mi data-latex="x">x</mi>
</math>`
);
});

/********************************************************************************/

it('Mathop No Apply', () => {
toXmlMatch(
tex2mml('\\mathop{} x'),
`<math xmlns="http://www.w3.org/1998/Math/MathML" data-latex="\\mathop{} x" display="block">
<mrow data-mjx-texclass="OP" data-latex="\\mathop{}"></mrow>
<mi data-latex="x">x</mi>
</math>`
);
});

/********************************************************************************/

it('Mathrel', () => {
toXmlMatch(
tex2mml('\\mathrel{R}'),
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7 changes: 7 additions & 0 deletions ts/input/tex/base/BaseItems.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -787,6 +787,13 @@ export class FnItem extends BaseItem {
return [[top, item], true];
}
}
// @test Mathop Apply, Mathop No Apply
if (
top.isKind('TeXAtom') &&
top.childNodes[0]?.childNodes?.length === 0
) {
return [[top, item], true];
}
// @test Named Function, Named Function Arg
const node = this.create(
'token',
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