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Add support for ES2025 RegExp duplicate named capturing groups #1291

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Add support for ES2025 RegExp duplicate named capturing groups #1291

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f03e191
Add support for ES2025 RegExp Duplicate named capturing groups
ota-meshi Apr 14, 2024
f7a9609
add test case
ota-meshi Apr 15, 2024
971bcff
refactor
ota-meshi Apr 15, 2024
589b298
fix comment
ota-meshi Apr 15, 2024
d376f70
fix comment
ota-meshi Apr 15, 2024
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add test case
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@ota-meshi
ota-meshi committed Apr 15, 2024
commit f7a9609d438fbd560bf0b541afaf651a390062f7
1 change: 1 addition & 0 deletions test/tests-regexp-2025.js
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Expand Up @@ -14,4 +14,5 @@ test("/(?<x>a)|(?<x>b)|(?<x>c)/", {}, { ecmaVersion: 2025 })
test("/(?<x>a)|\\k<x>/", {}, { ecmaVersion: 2025 })
testFail("/(?<x>a)|(?<x>b)(?<x>c)/", "Invalid regular expression: /(?<x>a)|(?<x>b)(?<x>c)/: Duplicate capture group name (1:1)", { ecmaVersion: 2025 })
testFail("/(?:(?<x>a)|(?<x>b))(?<x>c)/", "Invalid regular expression: /(?:(?<x>a)|(?<x>b))(?<x>c)/: Duplicate capture group name (1:1)", { ecmaVersion: 2025 })
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When I try it in Safari, it's not a syntax error. I may be misunderstanding something 🤔

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@ota-meshi ota-meshi Apr 15, 2024 •
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If I try the front and back swapped /(?<x>c)(?:(?<x>a)|(?<x>b))/ in Safari, I will get a syntax error.
Is it a bug in Safari that /(?:(?<x>a)|(?<x>b))(?<x>c)/ does not result in a syntax error? 🤔

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The way I read the spec, yes, that should be a syntax error—there is no | parse node that separates either of the first two definitions of <x> from the last one.

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Thank you for your comment!
I was relieved that my understanding was correct 😄
If the current specs are fine, I think this PR is ready for review.

testFail("/(?<x>a)(?:(?<x>b)|(?<x>c))/", "Invalid regular expression: /(?<x>a)(?:(?<x>b)|(?<x>c))/: Duplicate capture group name (1:1)", { ecmaVersion: 2025 })
testFail("/(?:(?:(?<x>a)|(?<x>b))|(?:))(?<x>c)/", "Invalid regular expression: /(?:(?:(?<x>a)|(?<x>b))|(?:))(?<x>c)/: Duplicate capture group name (1:1)", { ecmaVersion: 2025 })
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