graphql/lib/validator/rules/ScalarLeafs.js

A Query Language and Runtime which can target any service.

/* @flow */
/**
 *  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.
 */

'use strict';

var _Object$defineProperty = require('babel-runtime/core-js/object/define-property')['default'];

_Object$defineProperty(exports, '__esModule', {
  value: true
});

exports['default'] = ScalarLeafs;

var _error = require('../../error');

var _typeDefinition = require('../../type/definition');

var _errors = require('../errors');

/**
 * Scalar leafs
 *
 * A GraphQL document is valid only if all leaf fields (fields without
 * sub selections) are of scalar or enum types.
 */

function ScalarLeafs(context) {
  return {
    Field: function Field(node) {
      var type = context.getType();
      if (type) {
        if ((0, _typeDefinition.isLeafType)(type)) {
          if (node.selectionSet) {
            return new _error.GraphQLError((0, _errors.noSubselectionAllowedMessage)(node.name.value, type), [node.selectionSet]);
          }
        } else if (!node.selectionSet) {
          return new _error.GraphQLError((0, _errors.requiredSubselectionMessage)(node.name.value, type), [node]);
        }
      }
    }
  };
}

module.exports = exports['default'];