/
index.ts
156 lines (137 loc) 路 4.79 KB
/
index.ts
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import rewritePattern from "regexpu-core";
import {
featuresKey,
FEATURES,
enableFeature,
runtimeKey,
hasFeature,
} from "./features";
import { generateRegexpuOptions, canSkipRegexpu, transformFlags } from "./util";
import type { NodePath } from "@babel/traverse";
import { types as t } from "@babel/core";
import type { PluginObject } from "@babel/core";
import annotateAsPure from "@babel/helper-annotate-as-pure";
declare const PACKAGE_JSON: { name: string; version: string };
// Note: Versions are represented as an integer. e.g. 7.1.5 is represented
// as 70000100005. This method is easier than using a semver-parsing
// package, but it breaks if we release x.y.z where x, y or z are
// greater than 99_999.
const version = PACKAGE_JSON.version
.split(".")
.reduce((v, x) => v * 1e5 + +x, 0);
const versionKey = "@babel/plugin-regexp-features/version";
export interface Options {
name: string;
feature: keyof typeof FEATURES;
options?: {
useUnicodeFlag?: boolean;
runtime?: boolean;
};
manipulateOptions?: PluginObject["manipulateOptions"];
}
export function createRegExpFeaturePlugin({
name,
feature,
options = {},
manipulateOptions = () => {},
}: Options): PluginObject {
return {
name,
manipulateOptions,
pre() {
const { file } = this;
const features = file.get(featuresKey) ?? 0;
let newFeatures = enableFeature(features, FEATURES[feature]);
const { useUnicodeFlag, runtime } = options;
if (useUnicodeFlag === false) {
newFeatures = enableFeature(newFeatures, FEATURES.unicodeFlag);
}
if (newFeatures !== features) {
file.set(featuresKey, newFeatures);
}
if (runtime !== undefined) {
if (
file.has(runtimeKey) &&
file.get(runtimeKey) !== runtime &&
// TODO(Babel 8): Remove this check. It's necessary because in Babel 7
// we allow multiple copies of transform-named-capturing-groups-regex
// with conflicting 'runtime' options.
hasFeature(newFeatures, FEATURES.duplicateNamedCaptureGroups)
) {
throw new Error(
`The 'runtime' option must be the same for ` +
`'@babel/plugin-transform-named-capturing-groups-regex' and ` +
`'@babel/plugin-proposal-duplicate-named-capturing-groups-regex'.`,
);
}
// TODO(Babel 8): Remove this check and always set it.
// It's necessary because in Babel 7 we allow multiple copies of
// transform-named-capturing-groups-regex with conflicting 'runtime' options.
if (feature === "namedCaptureGroups") {
if (!runtime || !file.has(runtimeKey)) file.set(runtimeKey, runtime);
} else {
file.set(runtimeKey, runtime);
}
}
if (!file.has(versionKey) || file.get(versionKey) < version) {
file.set(versionKey, version);
}
},
visitor: {
RegExpLiteral(path) {
const { node } = path;
const { file } = this;
const features = file.get(featuresKey);
const runtime = file.get(runtimeKey) ?? true;
const regexpuOptions = generateRegexpuOptions(node.pattern, features);
if (canSkipRegexpu(node, regexpuOptions)) {
return;
}
const namedCaptureGroups: Record<string, number | number[]> = {
__proto__: null,
};
if (regexpuOptions.namedGroups === "transform") {
regexpuOptions.onNamedGroup = (name, index) => {
const prev = namedCaptureGroups[name];
if (typeof prev === "number") {
namedCaptureGroups[name] = [prev, index];
} else if (Array.isArray(prev)) {
prev.push(index);
} else {
namedCaptureGroups[name] = index;
}
};
}
let newFlags;
if (regexpuOptions.modifiers === "transform") {
regexpuOptions.onNewFlags = flags => {
newFlags = flags;
};
}
node.pattern = rewritePattern(node.pattern, node.flags, regexpuOptions);
if (
regexpuOptions.namedGroups === "transform" &&
Object.keys(namedCaptureGroups).length > 0 &&
runtime &&
!isRegExpTest(path)
) {
const call = t.callExpression(this.addHelper("wrapRegExp"), [
node,
t.valueToNode(namedCaptureGroups),
]);
annotateAsPure(call);
path.replaceWith(call);
}
node.flags = transformFlags(regexpuOptions, newFlags ?? node.flags);
},
},
};
}
function isRegExpTest(path: NodePath<t.RegExpLiteral>) {
return (
path.parentPath.isMemberExpression({
object: path.node,
computed: false,
}) && path.parentPath.get("property").isIdentifier({ name: "test" })
);
}