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fix: reject unbalanced parentheses in link destinations - #4107
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UziTech
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Rebase on master to get tests to pass
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Rebased. Locally the unit suite is 192 passing where it was 191 with one failure before, and the spec suite is 1863 passing with both new fixtures running. |
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# [18.1.0](v18.0.14...v18.1.0) (2026-10-05) ### Bug Fixes * avoid cubic backtracking on unicode whitespace in a link destination ([#4106](#4106)) ([0d20220](0d20220)) * load CLI configs with top-level await ([#4100](#4100)) ([c61543e](c61543e)) * reject unbalanced parentheses in link destinations ([#4107](#4107)) ([3363c99](3363c99)) ### Features * add linkParenPossible to lexer state to fail fast for link token generation ([#4070](#4070)) ([4ee44f7](4ee44f7))
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Marked version: 18.0.13
Markdown flavor: CommonMark
Description
marked.parse('[a]: /url(x\n')returns an empty string. The line disappears from the output.commonmark@0.31.2, the devDependency already in the repo, returns<p>[a]: /url(x</p>.A bare link destination "includes parentheses only if (a) they are backslash-escaped or (b) they are part of a balanced pair of unescaped parentheses" (spec 0.31.2), and a link reference definition is defined in terms of that destination. So
[a]: /url(xis not a definition and the line stays a paragraph.Tokenizer.defaccepted it anyway and produced adeftoken, which renders nothing, so the source text was dropped.Tokenizer.linkhas run this check since #3664.defnever did.Second half:
findClosingBracketreturned early when the string held no), so an unmatched(counted as balanced. That reaches inline links too, where[link](foo(bar)linked instead of staying literal. Both cases are in the fixtures, and every expected output there matches the reference parser byte for byte.Conformance does not move: 649/652 with gfm off, 645/652 with gfm on, before and after, and the completion table is unchanged. The 652 hold no example of this shape, which is why it was never measured.
test:unitalready fails onurl email protocolsat master 7f7a496, before this branch.Contributor
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