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Allow nested begin/end in bare blocks
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microsoft/vscode#141905
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@mjbvz
mjbvz committed Feb 3, 2022
1 parent 820d902 commit b1ed14d
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Showing 2 changed files with 32 additions and 7 deletions.
18 changes: 11 additions & 7 deletions index.js
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Expand Up @@ -203,14 +203,13 @@ function bare_math_block(state, start, end, silent) {
const endRe = /^\\end/;

if (!beginRe.test(firstLine)) { return false; }

if (silent) { return true; }

let nestingCount = 0;
let next;
for (next = start; !found;) {

next++;

if (next >= end) { break; }

pos = state.bMarks[next] + state.tShift[next];
Expand All @@ -221,10 +220,15 @@ function bare_math_block(state, start, end, silent) {
break;
}
const line = state.src.slice(pos, max);
if (endRe.test(line)) {
const lastPos = max;
lastLine = state.src.slice(pos, lastPos);
found = true;
if (beginRe.test(line)) {
++nestingCount;
} else if (endRe.test(line)) {
--nestingCount;
if (nestingCount < 0) {
const lastPos = max;
lastLine = state.src.slice(pos, lastPos);
found = true;
}
}
}

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21 changes: 21 additions & 0 deletions test/fixtures/bare.txt
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Expand Up @@ -29,3 +29,24 @@ end
\end{equation}</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:1.2000000000000002em;vertical-align:-0.35000000000000003em;"></span><span class="mtable"><span class="col-align-c"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.8500000000000001em;"><span style="top:-3.01em;"><span class="pstrut" style="height:3em;"></span><span class="mord"><span class="mord">2</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.35000000000000003em;"><span></span></span></span></span></span></span></span><span class="tag"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:0.8500000000000001em;"><span style="top:-2.8499999999999996em;"><span class="pstrut" style="height:2.84em;"></span><span class="eqn-num"></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:0.35000000000000003em;"><span></span></span></span></span></span></span></span></span></p>
<p>end</p>
.

Bare block with multiple begin/ends
.
start
\begin{equation}
\begin{split}
a = b \\
c = c
\end{split}
\end{equation}
end
.
<p>start</p>
<p class="katex-block"><span class="katex-display"><span class="katex"><span class="katex-mathml"><math xmlns="http://www.w3.org/1998/Math/MathML" display="block"><semantics><mtable rowspacing="0.1600em" columnspacing="1em"><mtr><mtd class ="mtr-glue"></mtd><mtd><mstyle scriptlevel="0" displaystyle="true"><mtable rowspacing="0.2500em" columnalign="right" columnspacing=""><mtr><mtd><mstyle scriptlevel="0" displaystyle="true"><mrow><mi>a</mi><mo>=</mo><mi>b</mi></mrow></mstyle></mtd></mtr><mtr><mtd><mstyle scriptlevel="0" displaystyle="true"><mrow><mi>c</mi><mo>=</mo><mi>c</mi></mrow></mstyle></mtd></mtr></mtable></mstyle></mtd><mtd class ="mtr-glue"></mtd><mtd class ="mml-eqn-num"></mtd></mtr></mtable><annotation encoding="application/x-tex">\begin{equation}
\begin{split}
a = b \\
c = c
\end{split}
\end{equation}</annotation></semantics></math></span><span class="katex-html" aria-hidden="true"><span class="base"><span class="strut" style="height:3.0000000000000004em;vertical-align:-1.2500000000000002em;"></span><span class="mtable"><span class="col-align-c"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:1.7500000000000002em;"><span style="top:-3.75em;"><span class="pstrut" style="height:3.75em;"></span><span class="mord"><span class="mord"><span class="mtable"><span class="col-align-r"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:1.7500000000000002em;"><span style="top:-3.91em;"><span class="pstrut" style="height:3em;"></span><span class="mord"><span class="mord mathnormal">a</span><span class="mspace" style="margin-right:0.2777777777777778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2777777777777778em;"></span><span class="mord mathnormal">b</span></span></span><span style="top:-2.41em;"><span class="pstrut" style="height:3em;"></span><span class="mord"><span class="mord mathnormal">c</span><span class="mspace" style="margin-right:0.2777777777777778em;"></span><span class="mrel">=</span><span class="mspace" style="margin-right:0.2777777777777778em;"></span><span class="mord mathnormal">c</span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:1.2500000000000002em;"><span></span></span></span></span></span></span></span></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:1.2500000000000002em;"><span></span></span></span></span></span></span></span><span class="tag"><span class="vlist-t vlist-t2"><span class="vlist-r"><span class="vlist" style="height:1.7500000000000002em;"><span style="top:-3.75em;"><span class="pstrut" style="height:3.75em;"></span><span class="eqn-num"></span></span></span><span class="vlist-s">​</span></span><span class="vlist-r"><span class="vlist" style="height:1.2500000000000002em;"><span></span></span></span></span></span></span></span></span></p>
<p>end</p>
.

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