forked from babel/babel
/
util.ts
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/
util.ts
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import type { types as t } from "@babel/core";
import { FEATURES, hasFeature } from "./features";
type RegexpuOptions = {
unicodeFlag: "transform" | false;
unicodeSetsFlag: "transform" | "parse" | false;
dotAllFlag: "transform" | false;
unicodePropertyEscapes: "transform" | false;
namedGroups: "transform" | false;
onNamedGroup: (name: string, index: number) => void;
};
type Stable = 0;
export function generateRegexpuOptions(toTransform: number): RegexpuOptions {
const feat = <IsStable extends 0 | 1>(
name: keyof typeof FEATURES,
ok: "transform" | (IsStable extends Stable ? never : "parse") = "transform",
) => {
return hasFeature(toTransform, FEATURES[name]) ? ok : false;
};
return {
unicodeFlag: feat<Stable>("unicodeFlag"),
unicodeSetsFlag:
feat("unicodeSetsFlag") || feat("unicodeSetsFlag_syntax", "parse"),
dotAllFlag: feat<Stable>("dotAllFlag"),
unicodePropertyEscapes: feat<Stable>("unicodePropertyEscape"),
namedGroups: feat<Stable>("namedCaptureGroups"),
onNamedGroup: () => {},
};
}
export function canSkipRegexpu(
node: t.RegExpLiteral,
options: RegexpuOptions,
): boolean {
const { flags, pattern } = node;
if (flags.includes("v")) {
if (options.unicodeSetsFlag === "transform") return false;
}
if (flags.includes("u")) {
if (options.unicodeFlag === "transform") return false;
if (
options.unicodePropertyEscapes === "transform" &&
/\\[pP]{/.test(pattern)
) {
return false;
}
}
if (flags.includes("s")) {
if (options.dotAllFlag === "transform") return false;
}
if (options.namedGroups === "transform" && /\(\?<(?![=!])/.test(pattern)) {
return false;
}
return true;
}
export function transformFlags(regexpuOptions: RegexpuOptions, flags: string) {
if (regexpuOptions.unicodeSetsFlag === "transform") {
flags = flags.replace("v", "u");
}
if (regexpuOptions.unicodeFlag === "transform") {
flags = flags.replace("u", "");
}
if (regexpuOptions.dotAllFlag === "transform") {
flags = flags.replace("s", "");
}
return flags;
}