/
renamer.ts
159 lines (131 loc) 路 4.23 KB
/
renamer.ts
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import Binding from "../binding";
import splitExportDeclaration from "@babel/helper-split-export-declaration";
import * as t from "@babel/types";
import type { Visitor } from "../../types";
const renameVisitor: Visitor<Renamer> = {
ReferencedIdentifier({ node }, state) {
if (node.name === state.oldName) {
node.name = state.newName;
}
},
Scope(path, state) {
if (
!path.scope.bindingIdentifierEquals(
state.oldName,
state.binding.identifier,
)
) {
skipAllButComputedMethodKey(path);
}
},
"AssignmentExpression|Declaration|VariableDeclarator"(path, state) {
if (path.isVariableDeclaration()) return;
const ids = path.getOuterBindingIdentifiers();
for (const name in ids) {
if (name === state.oldName) ids[name].name = state.newName;
}
},
};
export default class Renamer {
constructor(binding: Binding, oldName: string, newName: string) {
this.newName = newName;
this.oldName = oldName;
this.binding = binding;
}
declare oldName: string;
declare newName: string;
declare binding: Binding;
maybeConvertFromExportDeclaration(parentDeclar) {
const maybeExportDeclar = parentDeclar.parentPath;
if (!maybeExportDeclar.isExportDeclaration()) {
return;
}
if (
maybeExportDeclar.isExportDefaultDeclaration() &&
!maybeExportDeclar.get("declaration").node.id
) {
return;
}
splitExportDeclaration(maybeExportDeclar);
}
maybeConvertFromClassFunctionDeclaration(path) {
return; // TODO
// retain the `name` of a class/function declaration
// eslint-disable-next-line no-unreachable
if (!path.isFunctionDeclaration() && !path.isClassDeclaration()) return;
if (this.binding.kind !== "hoisted") return;
path.node.id = t.identifier(this.oldName);
path.node._blockHoist = 3;
path.replaceWith(
t.variableDeclaration("let", [
t.variableDeclarator(
t.identifier(this.newName),
t.toExpression(path.node),
),
]),
);
}
maybeConvertFromClassFunctionExpression(path) {
return; // TODO
// retain the `name` of a class/function expression
// eslint-disable-next-line no-unreachable
if (!path.isFunctionExpression() && !path.isClassExpression()) return;
if (this.binding.kind !== "local") return;
path.node.id = t.identifier(this.oldName);
this.binding.scope.parent.push({
id: t.identifier(this.newName),
});
path.replaceWith(
t.assignmentExpression("=", t.identifier(this.newName), path.node),
);
}
rename(block?) {
const { binding, oldName, newName } = this;
const { scope, path } = binding;
const parentDeclar = path.find(
path =>
path.isDeclaration() ||
path.isFunctionExpression() ||
path.isClassExpression(),
);
if (parentDeclar) {
const bindingIds = parentDeclar.getOuterBindingIdentifiers();
if (bindingIds[oldName] === binding.identifier) {
// When we are renaming an exported identifier, we need to ensure that
// the exported binding keeps the old name.
this.maybeConvertFromExportDeclaration(parentDeclar);
}
}
const blockToTraverse = block || scope.block;
if (blockToTraverse?.type === "SwitchStatement") {
// discriminant is not part of current scope, should be skipped.
blockToTraverse.cases.forEach(c => {
scope.traverse(c, renameVisitor, this);
});
} else {
scope.traverse(blockToTraverse, renameVisitor, this);
}
if (!block) {
scope.removeOwnBinding(oldName);
scope.bindings[newName] = binding;
this.binding.identifier.name = newName;
}
if (parentDeclar) {
this.maybeConvertFromClassFunctionDeclaration(parentDeclar);
this.maybeConvertFromClassFunctionExpression(parentDeclar);
}
}
}
function skipAllButComputedMethodKey(path) {
// If the path isn't method with computed key, just skip everything.
if (!path.isMethod() || !path.node.computed) {
path.skip();
return;
}
// So it's a method with a computed key. Make sure to skip every other key the
// traversal would visit.
const keys = t.VISITOR_KEYS[path.type];
for (const key of keys) {
if (key !== "key") path.skipKey(key);
}
}