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Enable regexp unicode sets parsing by default #15638

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merged 4 commits into from May 22, 2023
Merged

Enable regexp unicode sets parsing by default #15638

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58f7125
remove regexpUnicodeSets parser plugin
JLHwung May 17, 2023
1d633e2
move parser test cases to es2024
JLHwung May 17, 2023
8d2e895
materialize the unicodeSetsFlag_syntax feature
JLHwung May 18, 2023
b6e9188
unicodeSetsFlag_syntax bit should be preserved
JLHwung May 19, 2023
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20 changes: 10 additions & 10 deletions packages/babel-core/src/parser/util/missing-plugin-helper.ts
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Expand Up @@ -106,16 +106,6 @@ const pluginNameMap: Record<
url: "https://github.com/babel/babel/tree/main/packages/babel-plugin-syntax-record-and-tuple",
},
},
regexpUnicodeSets: {
syntax: {
name: "@babel/plugin-syntax-unicode-sets-regex",
url: "https://github.com/babel/babel/blob/main/packages/babel-plugin-syntax-unicode-sets-regex/README.md",
},
transform: {
name: "@babel/plugin-proposal-unicode-sets-regex",
url: "https://github.com/babel/babel/blob/main/packages/babel-plugin-proposalunicode-sets-regex/README.md",
},
},
throwExpressions: {
syntax: {
name: "@babel/plugin-syntax-throw-expressions",
Expand Down Expand Up @@ -289,6 +279,16 @@ if (!process.env.BABEL_8_BREAKING) {
url: "https://github.com/babel/babel/tree/main/packages/babel-plugin-proposal-private-property-in-object",
},
},
regexpUnicodeSets: {
syntax: {
name: "@babel/plugin-syntax-unicode-sets-regex",
url: "https://github.com/babel/babel/blob/main/packages/babel-plugin-syntax-unicode-sets-regex/README.md",
},
transform: {
name: "@babel/plugin-proposal-unicode-sets-regex",
url: "https://github.com/babel/babel/blob/main/packages/babel-plugin-proposalunicode-sets-regex/README.md",
},
},
});
}

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1 change: 1 addition & 0 deletions packages/babel-helper-create-regexp-features-plugin/src/features.ts
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Expand Up @@ -3,6 +3,7 @@ export const FEATURES = Object.freeze({
dotAllFlag: 1 << 1,
unicodePropertyEscape: 1 << 2,
namedCaptureGroups: 1 << 3,
// Babel 8.1: remove unicodeSetsFlag_syntax
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Why not 8.0?

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The type FeatureType depends on the value here, I was worrying plugging in BABEL_8_BREAKING switch here will confuse TypeScript. It seems that it can handle that well.

However, now I think we should preserve this bit even if it is no long used. The bits here decides how we interpret the filePass.get("@babel/plugin-regexp-features/featuresKey"). If we preserve this bit, then the featureKey defined by a Babel 7 plugin will still be respected by a Babel 8 regex plugin. Doing so should help the migration as mis-interpreting feature bits will result to confusing regex feature compilation: Babel is transpiling regex features other than what is perceived by users.

Therefore, unless we run out of all 53 bits, I don't think we have to remove any unused syntax bits. It suffices to just note that this bit is not used and is for compatibility with archived plugins.

unicodeSetsFlag_syntax: 1 << 4,
unicodeSetsFlag: 1 << 5,
duplicateNamedCaptureGroups: 1 << 6,
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4 changes: 1 addition & 3 deletions packages/babel-helper-create-regexp-features-plugin/src/util.ts
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Expand Up @@ -33,9 +33,7 @@ export function generateRegexpuOptions(

return {
unicodeFlag: feat("unicodeFlag"),
unicodeSetsFlag:
feat<Experimental>("unicodeSetsFlag") ||
feat<Experimental>("unicodeSetsFlag_syntax", "parse"),
unicodeSetsFlag: feat<Experimental>("unicodeSetsFlag") || "parse",
dotAllFlag: feat("dotAllFlag"),
unicodePropertyEscapes: feat("unicodePropertyEscape"),
namedGroups: feat("namedCaptureGroups") || featDuplicateNamedGroups(),
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3 changes: 0 additions & 3 deletions packages/babel-parser/src/tokenizer/index.ts
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Expand Up @@ -57,7 +57,6 @@ const VALID_REGEX_FLAGS = new Set([
charCodes.lowercaseY,
charCodes.lowercaseU,
charCodes.lowercaseD,
// This is only valid when using the regexpUnicodeSets plugin
charCodes.lowercaseV,
]);

Expand Down Expand Up @@ -1100,8 +1099,6 @@ export default abstract class Tokenizer extends CommentsParser {
// @ts-expect-error VALID_REGEX_FLAGS.has should accept expanded type: number
if (VALID_REGEX_FLAGS.has(cp)) {
if (cp === charCodes.lowercaseV) {
this.expectPlugin("regexpUnicodeSets", nextPos());

if (mods.includes("u")) {
this.raise(Errors.IncompatibleRegExpUVFlags, { at: nextPos() });
}
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2 changes: 1 addition & 1 deletion packages/babel-parser/src/typings.d.ts
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Expand Up @@ -34,7 +34,7 @@ export type Plugin =
| "partialApplication"
| "placeholders"
| "privateIn" // Enabled by default
| "regexpUnicodeSets"
| "regexpUnicodeSets" // Enabled by default
| "throwExpressions"
| "topLevelAwait"
| "v8intrinsic"
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0 ...l/_no-plugin/regexp-unicode-sets/input.js → ...es2024/regexp-unicode-sets/basic/input.js
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0 ...tal/regexp-unicode-sets/basic/output.json → ...024/regexp-unicode-sets/basic/output.json
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0 ...tal/regexp-unicode-sets/uv-error/input.js → ...024/regexp-unicode-sets/uv-error/input.js
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0 .../regexp-unicode-sets/uv-error/output.json → .../regexp-unicode-sets/uv-error/output.json
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0 ...tal/regexp-unicode-sets/vu-error/input.js → ...024/regexp-unicode-sets/vu-error/input.js
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0 .../regexp-unicode-sets/vu-error/output.json → .../regexp-unicode-sets/vu-error/output.json
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3 changes: 0 additions & 3 deletions packages/babel-parser/test/fixtures/experimental/_no-plugin/regexp-unicode-sets/options.json
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1 change: 0 additions & 1 deletion packages/babel-parser/test/fixtures/experimental/regexp-unicode-sets/basic/input.js
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3 changes: 0 additions & 3 deletions packages/babel-parser/test/fixtures/experimental/regexp-unicode-sets/options.json
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2 changes: 1 addition & 1 deletion packages/babel-parser/typings/babel-parser.d.ts
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Expand Up @@ -38,7 +38,7 @@ type Plugin =
| "partialApplication"
| "placeholders"
| "privateIn" // Enabled by default
| "regexpUnicodeSets"
| "regexpUnicodeSets" // Enabled by default
| "throwExpressions"
| "topLevelAwait"
| "v8intrinsic"
Expand Down