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Performance improvement for large texts with many HTML spans #994

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Performance improvement for large texts with many HTML spans #994

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11b6aa2
added very slow performance test
Jan 18, 2024
001125a
huge performance improvement for large texts with many spans (~20x)
Jan 18, 2024
6483564
simplification
Jan 18, 2024
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12 changes: 11 additions & 1 deletion src/subParsers/makehtml/hashHTMLSpans.js
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,8 @@ showdown.subParser('makehtml.unhashHTMLSpans', function (text, options, globals)
'use strict';
text = globals.converter._dispatch('makehtml.unhashHTMLSpans.before', text, options, globals).getText();

var replacedSpans = [];

for (var i = 0; i < globals.gHtmlSpans.length; ++i) {
var repText = globals.gHtmlSpans[i],
// limiter to prevent infinite loop (assume 10 as limit for recurse)
Expand All @@ -50,9 +52,17 @@ showdown.subParser('makehtml.unhashHTMLSpans', function (text, options, globals)
}
++limit;
}
text = text.replace('¨C' + i + 'C', repText);

replacedSpans.push(repText);
}

// It is important to only do one replace for all the spans combined.
// Otherwise this gets really slow on large texts with many spans because
// of all the string copies.
text = text.replace(/¨C(\d+)C/g, function (_wm, num) {
return replacedSpans[num];
});

text = globals.converter._dispatch('makehtml.unhashHTMLSpans.after', text, options, globals).getText();
return text;
});