@ledgerhq/hw-app-eth/lib-es/utils.js

/********************************************************************************
 *   Ledger Node JS API
 *   (c) 2016-2017 Ledger
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 ********************************************************************************/
export function defer() {
  let resolve, reject;
  let promise = new Promise(function (success, failure) {
    resolve = success;
    reject = failure;
  });
  if (!resolve || !reject) throw "defer() error"; // this never happens and is just to make flow happy

  return {
    promise,
    resolve,
    reject
  };
} // TODO use bip32-path library

export function splitPath(path) {
  let result = [];
  let components = path.split("/");
  components.forEach(element => {
    let number = parseInt(element, 10);

    if (isNaN(number)) {
      return; // FIXME shouldn't it throws instead?
    }

    if (element.length > 1 && element[element.length - 1] === "'") {
      number += 0x80000000;
    }

    result.push(number);
  });
  return result;
} // TODO use async await

export function eachSeries(arr, fun) {
  return arr.reduce((p, e) => p.then(() => fun(e)), Promise.resolve());
}
export function foreach(arr, callback) {
  function iterate(index, array, result) {
    if (index >= array.length) {
      return result;
    } else return callback(array[index], index).then(function (res) {
      result.push(res);
      return iterate(index + 1, array, result);
    });
  }

  return Promise.resolve().then(() => iterate(0, arr, []));
}
export function doIf(condition, callback) {
  return Promise.resolve().then(() => {
    if (condition) {
      return callback();
    }
  });
}
export function asyncWhile(predicate, callback) {
  function iterate(result) {
    if (!predicate()) {
      return result;
    } else {
      return callback().then(res => {
        result.push(res);
        return iterate(result);
      });
    }
  }

  return Promise.resolve([]).then(iterate);
}
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