/*
* Copyright (c) 2015, Facebook, Inc.
* All rights reserved.
*
* This source code is licensed under the BSD-style license found in the
* LICENSE file in the root directory of this source tree. An additional grant
* of patent rights can be found in the PATENTS file in the same directory.
*
* @flow
*
*/
import match from './match';
import recast from 'recast';
import resolveToValue from './resolveToValue';
var {types: {namedTypes: types}} = recast;
/**
* Given a path (e.g. call expression, member expression or identifier),
* this function tries to find the name of module from which the "root value"
* was imported.
*/
export default function resolveToModule(path: NodePath): ?string {
var node = path.node;
switch (node.type) {
case types.VariableDeclarator.name:
if (node.init) {
return resolveToModule(path.get('init'));
}
break;
case types.CallExpression.name:
if (match(node.callee, {type: types.Identifier.name, name: 'require'})) {
return node.arguments[0].value;
}
return resolveToModule(path.get('callee'));
case types.Identifier.name:
var valuePath = resolveToValue(path);
if (valuePath !== path) {
return resolveToModule(valuePath);
}
break;
case types.ImportDeclaration.name:
return node.source.value;
case types.MemberExpression.name:
while (path && types.MemberExpression.check(path.node)) {
path = path.get('object');
}
Eif (path) {
return resolveToModule(path);
}
}
}
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