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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';


export function unusedFragMessage(fragName: string): string {
  return `Fragment "${fragName}" is never used.`;
}

/**
 * No unused fragments
 *
 * A GraphQL document is only valid if all fragment definitions are spread
 * within operations, or spread within other fragments spread within operations.
 */
export function NoUnusedFragments(context: ValidationContext): any {
  const operationDefs = [];
  const fragmentDefs = [];

  return {
    OperationDefinition(node) {
      operationDefs.push(node);
      return false;
    },
    FragmentDefinition(node) {
      fragmentDefs.push(node);
      return false;
    },
    Document: {
      leave() {
        const fragmentNameUsed = Object.create(null);
        operationDefs.forEach(operation => {
          context.getRecursivelyReferencedFragments(operation).forEach(
            fragment => { fragmentNameUsed[fragment.name.value] = true; }
          );
        });

        fragmentDefs.forEach(fragmentDef => {
          const fragName = fragmentDef.name.value;
          if (fragmentNameUsed[fragName] !== true) {
            context.reportError(new GraphQLError(
              unusedFragMessage(fragName),
              [ fragmentDef ]
            ));
          }
        });
      }
    }
  };
}