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perf: optimize reference link masking #4048

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perf: optimize reference link masking #4048

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c6932e1
perf: optimize reference link masking
sarthakagrawal927 Aug 9, 2026
171e3df
simplify reference link lookup
sarthakagrawal927 Aug 10, 2026
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13 changes: 4 additions & 9 deletions src/Lexer.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -306,15 +306,10 @@ export class _Lexer<ParserOutput = string, RendererOutput = string> {
let maskedSrc = src;

// Mask out reflinks
if (this.tokens.links) {

@UziTech UziTech Aug 11, 2026

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We should still check if (this.tokens.links && Object.entries(this.tokens.links).length > 0) to prevent checking if we don't need to

const links = Object.keys(this.tokens.links);
if (links.length > 0) {
maskedSrc = maskedSrc.replace(this.tokenizer.rules.inline.reflinkSearch, match0 =>
links.includes(match0.slice(match0.lastIndexOf('[') + 1, -1))
? '[' + 'a'.repeat(match0.length - 2) + ']'
: match0);
}
}
maskedSrc = maskedSrc.replace(this.tokenizer.rules.inline.reflinkSearch, match0 =>
Object.hasOwn(this.tokens.links, match0.slice(match0.lastIndexOf('[') + 1, -1))
? '[' + 'a'.repeat(match0.length - 2) + ']'
: match0);

// Mask out escaped characters.
// Every mask must keep the length it replaces: emStrong and del line
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