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Maven plugin for generating graphql clients

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/* @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.
 */

import type { ValidationContext } from '../index';
import { GraphQLError } from '../../error';
import { OPERATION_DEFINITION } from '../../language/kinds';


export function anonOperationNotAloneMessage(): string {
  return 'This anonymous operation must be the only defined operation.';
}

/**
 * Lone anonymous operation
 *
 * A GraphQL document is only valid if when it contains an anonymous operation
 * (the query short-hand) that it contains only that one operation definition.
 */
export function LoneAnonymousOperation(context: ValidationContext): any {
  let operationCount = 0;
  return {
    Document(node) {
      operationCount = node.definitions.filter(
        definition => definition.kind === OPERATION_DEFINITION
      ).length;
    },
    OperationDefinition(node) {
      if (!node.name && operationCount > 1) {
        context.reportError(
          new GraphQLError(anonOperationNotAloneMessage(), [ node ])
        );
      }
    }
  };
}