/*
 *  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
 */
"use strict";

var expressionTo = require('./expressionTo');
var types = require('recast').types.namedTypes;

/**
 * Returns true if the expression is of form `exports.foo = ...;` or
 * `modules.exports = ...;`.
 */
function isExportsOrModuleAssignment(path: NodePath): boolean {
  if (types.ExpressionStatement.check(path.node)) {
    path = path.get('expression');
  }
  if (!types.AssignmentExpression.check(path.node) ||
    !types.MemberExpression.check(path.node.left)) {
    return false;
  }

  var exprArr = expressionTo.Array(path.get('left'));
  return (exprArr[0] === 'module' && exprArr[1] === 'exports') ||
    exprArr[0] == 'exports';
}

module.exports = isExportsOrModuleAssignment;