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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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2 changes: 1 addition & 1 deletion acorn/src/acorn.d.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -573,7 +573,7 @@ export function tokenizer(input: string, options: Options): {
[Symbol.iterator](): Iterator<Token>
}

export type ecmaVersion = 3 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | "latest"
export type ecmaVersion = 3 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2025 | "latest"

export interface Options {
/**
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35 changes: 35 additions & 0 deletions acorn/src/regexp.js
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Expand Up @@ -23,6 +23,7 @@ export class RegExpValidationState {
this.numCapturingParens = 0
this.maxBackReference = 0
this.groupNames = []
this.groupNamesToAddToUpperScope = []
this.backReferenceNames = []
}

Expand Down Expand Up @@ -169,6 +170,7 @@ pp.regexp_pattern = function(state) {
state.numCapturingParens = 0
state.maxBackReference = 0
state.groupNames.length = 0
state.groupNamesToAddToUpperScope.length = 0
state.backReferenceNames.length = 0

this.regexp_disjunction(state)
Expand All @@ -194,11 +196,28 @@ pp.regexp_pattern = function(state) {

// https://www.ecma-international.org/ecma-262/8.0/#prod-Disjunction
pp.regexp_disjunction = function(state) {
let groupNamesToAddToUpperUpperScope
if (this.options.ecmaVersion >= 16) {
groupNamesToAddToUpperUpperScope = state.groupNamesToAddToUpperScope
// Clear groupNamesToAddToUpperScope to store the groupName added in this Disjunction.
state.groupNamesToAddToUpperScope = []
}

this.regexp_alternative(state)
while (state.eat(0x7C /* | */)) {
this.regexp_alternative(state)
}

if (this.options.ecmaVersion >= 16) {
for (const groupName of state.groupNamesToAddToUpperScope) {
// Adds the groupName added in Disjunction to groupNames.
state.groupNames.push(groupName)
// Adds the groupName added in Disjunction to the upper scope.
groupNamesToAddToUpperUpperScope.push(groupName)
}
state.groupNamesToAddToUpperScope = groupNamesToAddToUpperUpperScope
}

// Make the same message as V8.
if (this.regexp_eatQuantifier(state, true)) {
state.raise("Nothing to repeat")
Expand All @@ -210,8 +229,24 @@ pp.regexp_disjunction = function(state) {

// https://www.ecma-international.org/ecma-262/8.0/#prod-Alternative
pp.regexp_alternative = function(state) {
let upperGroupNames
if (this.options.ecmaVersion >= 16) {
upperGroupNames = [...state.groupNames]
}

while (state.pos < state.source.length && this.regexp_eatTerm(state))
;

if (this.options.ecmaVersion >= 16) {
// Adds the groupName added in Alternative to the upper scope.
for (const groupName of state.groupNames) {
if (upperGroupNames.indexOf(groupName) === -1) {
state.groupNamesToAddToUpperScope.push(groupName)
}
}
// Reverts the groupNames so that the next adjacent Alternative does not report duplicates.
state.groupNames = upperGroupNames
}
}

// https://www.ecma-international.org/ecma-262/8.0/#prod-annexB-Term
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1 change: 0 additions & 1 deletion bin/test262.unsupported-features
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@@ -1,3 +1,2 @@
decorators
import-assertions
regexp-duplicate-named-groups
1 change: 1 addition & 0 deletions test/run.js
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Expand Up @@ -15,6 +15,7 @@
require("./tests-regexp-2020.js");
require("./tests-regexp-2022.js");
require("./tests-regexp-2024.js");
require("./tests-regexp-2025.js");
require("./tests-json-superset.js");
require("./tests-optional-catch-binding.js");
require("./tests-bigint.js");
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18 changes: 18 additions & 0 deletions test/tests-regexp-2025.js
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@@ -0,0 +1,18 @@
if (typeof exports !== "undefined") {
var test = require("./driver.js").test
var testFail = require("./driver.js").testFail
}

test("/(?<x>a)|(?<x>b)/", {}, { ecmaVersion: 2025 })
testFail("/(?<x>a)|(?<x>b)/", "Invalid regular expression: /(?<x>a)|(?<x>b)/: Duplicate capture group name (1:1)", { ecmaVersion: 2024 })
testFail("/(?<x>a)(?<x>b)/", "Invalid regular expression: /(?<x>a)(?<x>b)/: Duplicate capture group name (1:1)", { ecmaVersion: 2025 })
test("/(?:(?<x>a)|(?<x>b))\\k<x>/", {}, { ecmaVersion: 2025 })
testFail("/(?:(?<x>a)|(?<x>b))\\k<x>/", "Invalid regular expression: /(?:(?<x>a)|(?<x>b))\\k<x>/: Duplicate capture group name (1:1)", { ecmaVersion: 2024 })
testFail("/(?:(?<x>a)(?<x>b))\\k<x>/", "Invalid regular expression: /(?:(?<x>a)(?<x>b))\\k<x>/: Duplicate capture group name (1:1)", { ecmaVersion: 2025 })
test("/(?<y>a)(?<x>a)|(?<x>b)(?<y>b)/", {}, { ecmaVersion: 2025 })
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 })