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Allow spaces after @ in CD environment, as in real LaTeX. (mathjax/MathJax#3425) #1343

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Allow spaces after @ in CD environment, as in real LaTeX. (mathjax/MathJax#3425) #1343

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29 changes: 29 additions & 0 deletions testsuite/tests/input/tex/Amscd.test.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -752,6 +752,35 @@ describe('AmsCD', () => {

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

it('Spaces', () => {
toXmlMatch(
tex2mml('\\begin{CD}A @ > x > > B \\end{CD}'),
`<math xmlns="http://www.w3.org/1998/Math/MathML" data-latex="\\begin{CD}A @ &gt; x &gt; &gt; B \\end{CD}" display="block">
<mtable columnspacing="5pt" rowspacing="5pt" displaystyle="true" data-latex-item="{CD}" data-latex="\\begin{CD}A @ &gt; x &gt; &gt; B \\end{CD}">
<mtr>
<mtd>
<mi data-latex="A">A</mi>
<mpadded height="8.5pt" depth="2pt"></mpadded>
</mtd>
<mtd>
<mover>
<mo minsize="2.75em">&#x2192;</mo>
<mpadded width="+.67em" lspace=".33em" voffset=".1em">
<mi data-latex="x">x</mi>
</mpadded>
</mover>
</mtd>
<mtd>
<mi data-latex="B">B</mi>
</mtd>
</mtr>
</mtable>
</math>`
);
});

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

it('Suspicious Return', () => {
toXmlMatch(
tex2mml('\\begin{CD}A @Ra>> BaD\\end{CD}'),
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4 changes: 3 additions & 1 deletion ts/input/tex/amscd/AmsCdMethods.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -64,9 +64,11 @@ const AmsCdMethods: { [key: string]: ParseMethod } = {
* @returns {void} No value.
*/
arrow(parser: TexParser, name: string): void {
const c = parser.string.charAt(parser.i);
const i = parser.i;
const c = parser.GetNext();
if (!c.match(/[><VA.|=]/)) {
// TODO: This return is suspicious.
parser.i = i;
return Other(parser, name);
} else {
parser.i++;
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