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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
// @flow
import * as t from "@babel/types";
import type { SimplePath } from "./simple-path";
// the function class is inferred from a call like
// createClass or extend
function fromCallExpression(callExpression: SimplePath) {
const allowlist = ["extend", "createClass"];
const { callee } = callExpression.node;
if (!callee) {
return null;
}
const name = t.isMemberExpression(callee)
? callee.property.name
: callee.name;
if (!allowlist.includes(name)) {
return null;
}
const variable = callExpression.findParent(p =>
t.isVariableDeclarator(p.node)
);
if (variable) {
return variable.node.id.name;
}
const assignment = callExpression.findParent(p =>
t.isAssignmentExpression(p.node)
);
if (!assignment) {
return null;
}
const { left } = assignment.node;
if (left.name) {
return name;
}
if (t.isMemberExpression(left)) {
return left.property.name;
}
return null;
}
// the function class is inferred from a prototype assignment
// e.g. TodoClass.prototype.render = function() {}
function fromPrototype(assignment) {
const { left } = assignment.node;
if (!left) {
return null;
}
if (
t.isMemberExpression(left) &&
left.object &&
t.isMemberExpression(left.object) &&
left.object.property.identifier === "prototype"
) {
return left.object.object.name;
}
return null;
}
// infer class finds an appropriate class for functions
// that are defined inside of a class like thing.
// e.g. `class Foo`, `TodoClass.prototype.foo`,
// `Todo = createClass({ foo: () => {}})`
export function inferClassName(path: SimplePath): string | null {
const classDeclaration = path.findParent(p => t.isClassDeclaration(p.node));
if (classDeclaration) {
return classDeclaration.node.id.name;
}
const callExpression = path.findParent(p => t.isCallExpression(p.node));
if (callExpression) {
return fromCallExpression(callExpression);
}
const assignment = path.findParent(p => t.isAssignmentExpression(p.node));
if (assignment) {
return fromPrototype(assignment);
}
return null;
}
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