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rOACCT/node_modules/regenerator-transform/src/replaceShorthandObjectMethod.js
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replaceShorthandObjectMethod.js
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/**
* Copyright (c) 2014-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*/
import * as util from "./util";
// this function converts a shorthand object generator method into a normal
// (non-shorthand) object property which is a generator function expression. for
// example, this:
//
// var foo = {
// *bar(baz) { return 5; }
// }
//
// should be replaced with:
//
// var foo = {
// bar: function*(baz) { return 5; }
// }
//
// to do this, it clones the parameter array and the body of the object generator
// method into a new FunctionExpression.
//
// this method can be passed any Function AST node path, and it will return
// either:
// a) the path that was passed in (iff the path did not need to be replaced) or
// b) the path of the new FunctionExpression that was created as a replacement
// (iff the path did need to be replaced)
//
// In either case, though, the caller can count on the fact that the return value
// is a Function AST node path.
//
// If this function is called with an AST node path that is not a Function (or with an
// argument that isn't an AST node path), it will throw an error.
export default function replaceShorthandObjectMethod(path) {
const t = util.getTypes();
if (!path.node || !t.isFunction(path.node)) {
throw new Error("replaceShorthandObjectMethod can only be called on Function AST node paths.");
}
// this function only replaces shorthand object methods (called ObjectMethod
// in Babel-speak).
if (!t.isObjectMethod(path.node)) {
return path;
}
// this function only replaces generators.
if (!path.node.generator) {
return path;
}
const parameters = path.node.params.map(function (param) {
return t.cloneDeep(param);
})
const functionExpression = t.functionExpression(
null, // id
parameters, // params
t.cloneDeep(path.node.body), // body
path.node.generator,
path.node.async
);
util.replaceWithOrRemove(path,
t.objectProperty(
t.cloneDeep(path.node.key), // key
functionExpression, //value
path.node.computed, // computed
false // shorthand
)
);
// path now refers to the ObjectProperty AST node path, but we want to return a
// Function AST node path for the function expression we created. we know that
// the FunctionExpression we just created is the value of the ObjectProperty,
// so return the "value" path off of this path.
return path.get("value");
}
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