@dillonkearns/elm-graphql/examples/src/subscription/node_modules/graphql/utilities/getOperationAST.js

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'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.getOperationAST = getOperationAST;

var _kinds = require('../language/kinds');

/**
 * Returns an operation AST given a document AST and optionally an operation
 * name. If a name is not provided, an operation is only returned if only one is
 * provided in the document.
 */
function getOperationAST(documentAST, operationName) {
  var operation = null;
  for (var i = 0; i < documentAST.definitions.length; i++) {
    var definition = documentAST.definitions[i];
    if (definition.kind === _kinds.OPERATION_DEFINITION) {
      if (!operationName) {
        // If no operation name was provided, only return an Operation if there
        // is one defined in the document. Upon encountering the second, return
        // null.
        if (operation) {
          return null;
        }
        operation = definition;
      } else if (definition.name && definition.name.value === operationName) {
        return definition;
      }
    }
  }
  return operation;
} /**
   * Copyright (c) 2015-present, Facebook, Inc.
   *
   * This source code is licensed under the MIT license found in the
   * LICENSE file in the root directory of this source tree.
   *
   * 
   */