xref: /commonlibrary/ets_utils/js_util_module/util/src/util_js.ts

/*
 * Copyright (c) 2021 Huawei Device Co., Ltd.
 * 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.
 */

interface HelpUtil {
  TextEncoder: Object;
  TextDecoder: TextDecoder;
  Base64: Object;
  Base64Helper: NativeBase64;
  Types: Object;
  StringDecoder: Object;
  dealwithformatstring(formatString: string | Array<string | number | Function>): string;
  printf(formatString: string | Array<string | number | Function>,
    ...valueString: Array<Object>): string;
  format(formatString: Array<string | number | Function>, ...valueString: Array<Object>): string
  geterrorstring(errnum: number): string;
  errnoToString(errnum: number): string;
  randomUUID(entropyCache?: boolean): string;
  randomBinaryUUID(entropyCache?: boolean): Uint8Array;
  parseUUID(uuid: string): Uint8Array;
  getHash(obj: object): number;
}

type AnyType = Object | null | undefined;

declare function requireInternal(s: string): HelpUtil;
const helpUtil = requireInternal('util');
let textEncoder = helpUtil.TextEncoder;
let base64 = helpUtil.Base64;
let types = helpUtil.Types;
let stringdecoder = helpUtil.StringDecoder;

const CONVERTER_FLAGS_FLUSH = 0x1;
const CONVERTER_FLAGS_FATAL = 0x2;
const CONVERTER_FLAGS_IGNORE_BOM = 0x4;
const typeErrorCode = 401;
const syntaxErrorCode = 10200002;
class BusinessError extends Error {
  code: number;
  constructor(msg: string) {
    super(msg);
    this.name = 'BusinessError';
    this.code = typeErrorCode;
  }
}

interface NativeBase64 {
  new(): NativeBase64;
  encodeSync(src: Uint8Array, options?: Type): Uint8Array;
  encodeToStringSync(src: Uint8Array, options?: Type): string;
  decodeSync(src: Uint8Array | string, options?: Type): Uint8Array;
  encode(src: Uint8Array, options?: Type): Promise<Uint8Array>;
  encodeToString(src: Uint8Array, options?: Type): Promise<string>;
  decode(src: Uint8Array | string, options?: Type): Promise<Uint8Array>;
}

interface Base64Helper {
  Base64Helper: NativeBase64;
}

enum Type {
  BASIC,
  MIME,
  BASIC_URL_SAFE,
  MIME_URL_SAFE
}

class Base64Helper {
  base64: NativeBase64;
  constructor() {
    this.base64 = new helpUtil.Base64Helper();
  }

  encodeSync(src: Uint8Array, options: Type = Type.BASIC): Uint8Array {
    return this.base64.encodeSync(src, options);
  }

  private addBreaks(resultString: string): string {
    const chunkSize = 76; // 76 : MIME format encoding data limitations
    let i = 0;
    let newString: string = '';
    let stringLength = resultString.length;
    if (stringLength < chunkSize) {
      throw new Error('The parameter length does not meet this encoding format.');
    }
    while (i < stringLength && stringLength > chunkSize) {
      let index = i + chunkSize;
      if (i + chunkSize > stringLength) {
        index = stringLength;
      }
      let temp: string = resultString.substring(i, index);
      newString = newString + temp + '\r\n';
      i += chunkSize;
    }
    return newString;
  }

  encodeToStringSync(src: Uint8Array, options: Type = Type.BASIC): string {
    let resultString: string = this.base64.encodeToStringSync(src, options);
    if (options === Type.MIME || options === Type.MIME_URL_SAFE) {
      return this.addBreaks(resultString);
    }
    return resultString;
  }

  decodeSync(src: Uint8Array | string, options: Type = Type.BASIC): Uint8Array {
    if (typeof src === 'string' && (src.indexOf('\r') !== -1 || src.indexOf('\n') !== -1)) {
      src = src.replace(/[\r\n]/g, '');
    }
    return this.base64.decodeSync(src, options);
  }

  encode(src: Uint8Array, options: Type = Type.BASIC): Promise<Uint8Array> {
    if (!Object.values(Type).includes(options) || options === Type.MIME || options === Type.MIME_URL_SAFE) {
      let error = new BusinessError(`Parameter error. The type of ${options} must be BASIC or BASIC_URL_SAFE`);
      throw error;
    }
    return this.base64.encode(src, options);
  }

  encodeToString(src: Uint8Array, options: Type = Type.BASIC): Promise<string> {
    if (!Object.values(Type).includes(options)) {
      let error = new BusinessError(`Parameter error. The type of ${options} must be one of the type enumerations`);
      throw error;
    }
    let base64Result: Promise<string> = this.base64.encodeToString(src, options);
    if (options === Type.MIME || options === Type.MIME_URL_SAFE) {
      return base64Result.then((result) => {
        return this.addBreaks(result);
      });
    }
    return base64Result;
  }

  decode(src: Uint8Array | string, options: Type = Type.BASIC): Promise<Uint8Array> {
    if (!Object.values(Type).includes(options)) {
      let error = new BusinessError(`Parameter error. The type of ${options} must be one of the type enumerations`);
      throw error;
    }
    if (typeof src === 'string') {
      src = src.replace(/[\r\n]/g, '');
    }
    return this.base64.decode(src, options);
  }
}

function switchLittleObject(enter: string, obj: Object, count: number): string | Object {
  let str: string = '';
  if (obj === null) {
    str += obj;
  } else if (obj instanceof Array) {
    str += '[ ' + arrayToString(enter, obj, count) + '[length]: ' + obj.length + ' ]';
  } else if (typeof obj === 'function') {
    str += '{ [Function: ' + obj.name + ']' + enter +
      '[length]: ' + obj.length + ',' + enter +
      '[name] :\'' + obj.name + '\',' + enter +
      '[prototype]: ' + obj.name + ' { [constructor]: [Circular] } }';
  } else if (typeof obj === 'object') {
    str += '{ ';
    let i: string;
    let flag: boolean = false;
    for (i in obj) {
      flag = true;
      str += switchLittleValue(enter, i, obj, count);
    }
    if (!flag) {
      return obj;
    }
    str = str.substr(0, str.length - enter.length - 1);
    str += ' }';
  } else if (typeof obj === 'string') {
    str += '\'' + obj + '\'';
  } else {
    str += obj;
  }
  return str;
}

function switchLittleValue(enter: string, protoName: string, obj: Object, count: number): string {
  let str: string = '';
  if (obj[protoName] === null) {
    str += protoName + ': null,' + enter;
  } else if (obj[protoName] instanceof Array) {
    str += protoName + ':' + enter +
      '[ ' + arrayToString(enter + '  ', obj[protoName], count) + '[length]: ' +
      obj[protoName].length + ' ],' + enter;
  } else if (typeof obj[protoName] === 'object') {
    if (obj[protoName] === obj) {
      str += protoName + ': [Circular]' + enter;
    } else {
      str += protoName + ':' + enter;
      str += switchLittleObject(enter + '  ', obj[protoName], count + 1) + ',' + enter;
    }
  } else if (typeof obj[protoName] === 'function') {
    let space: string = enter;
    if (obj[protoName].name !== '') {
      str += obj[protoName].name + ':' + space;
    }
    space += '  ';
    str += '{ [Function: ' + obj[protoName].name + ']' + space +
      '[length]: ' + obj[protoName].length + ',' + space +
      '[name] :\'' + obj[protoName].name + '\',' + space +
      '[prototype]: ' + obj[protoName].name +
      ' { [constructor]: [Circular] } },' + enter;
  } else {
    if (typeof obj[protoName] === 'string') {
      str += protoName + ': \'' + obj[protoName] + '\',' + enter;
    } else {
      str += protoName + ': ' + obj[protoName] + ',' + enter;
    }
  }
  return str;
}

function arrayToString(enter: string, arr: Array<string | number | Function>, count: number): string {
  let str: string = '';
  if (!arr.length) {
    return '';
  }
  let arrayEnter: string = ', ';
  for (let k in arr) {
    if (arr[k] !== null && (typeof arr[k] === 'function' || typeof arr[k] === 'object') && count <= 2) {
      arrayEnter += enter;
      break;
    }
  }
  for (let i of arr) {
    if (typeof i === 'string') {
      str += '\'' + i.toString() + '\'' + arrayEnter;
    } else if (typeof i === 'object') {
      str += switchLittleObject(enter + '  ', i, count + 1);
      str += arrayEnter;
    } else if (typeof i === 'function') {
      let space: string = enter;
      space += '  ';
      let end: string = '';
      if (i.name !== '') {
        str += '{ [Function: ' + i.name + ']' + space;
        end = i.name + ' { [constructor]: [Circular] } }' + arrayEnter;
      } else {
        str += '{ [Function]' + space;
        end = '{ [constructor]: [Circular] } }' + arrayEnter;
      }
      str += '[length]: ' +
        i.length + ',' + space +
        '[name] :\'' + i.name + '\',' + space +
        '[prototype]: ' + end;
    } else {
      str += i + arrayEnter;
    }
  }
  return str;
}

function switchBigObject(enter: string, obj: Object, count: number): string | Object {
  let str: string = '';
  if (obj === null) {
    str += obj;
  } else if (obj instanceof Array) {
    str += '[ ' + arrayToBigString(enter, obj, count) + ' ]';
  } else if (typeof obj === 'function') {
    str += '{ [Function: ' + obj.name + '] }';
  } else if (typeof obj === 'object') {
    str += '{ ';
    let i: string;
    let flag: boolean = false;
    for (i in obj) {
      flag = true;
      str += switchBigValue(enter, i, obj, count);
    }
    if (!flag) {
      return obj;
    }
    str = str.substr(0, str.length - enter.length - 1);
    str += ' }';
  } else if (typeof obj === 'string') {
    str += '\'' + obj + '\'';
  } else {
    str += obj;
  }
  return str;
}

function switchBigValue(enter: string, protoName: string, obj: Object, count: number): string {
  let str: string = '';
  if (obj[protoName] === null) {
    str += protoName + ': null,' + enter;
  } else if (obj[protoName] instanceof Array) {
    str += protoName + ':' + enter +
      '[ ' + arrayToBigString(enter + '  ', obj[protoName], count) + ' ],' + enter;
  } else if (typeof obj[protoName] === 'object') {
    if (obj[protoName] === obj) {
      str += protoName + ': [Circular]' + enter;
    } else {
      str += protoName + ':' + enter;
      str += switchBigObject(enter + '  ', obj[protoName], count + 1) + ',' + enter;
    }
  } else if (typeof obj[protoName] === 'function') {
    if (obj[protoName].name !== '') {
      str += obj[protoName].name + ': ';
    }
    str += '[Function: ' + obj[protoName].name + '],' + enter;
  } else {
    if (typeof obj[protoName] === 'string') {
      str += protoName + ': \'' + obj[protoName] + '\',' + enter;
    } else {
      str += protoName + ': ' + obj[protoName] + ',' + enter;
    }
  }
  return str;
}

function arrayToBigString(enter: string, arr: Array<string | number | Function>, count: number): string {
  let str: string = '';
  if (!arr.length) {
    return '';
  }

  let arrayEnter = ', ';
  for (let i of arr) {
    if (i !== null && (typeof i === 'object') && count <= 2) {
      arrayEnter += enter;
      break;
    }
  }
  for (let j of arr) {
    if (typeof j === 'string') {
      str += '\'' + j + '\'' + arrayEnter;
    } else if (typeof j === 'object') {
      str += switchBigObject(enter + '  ', j, count + 1);
      str += arrayEnter;
    } else if (typeof j === 'function') {
      if (j.name !== '') {
        str += '[Function: ' + j.name + ']' + arrayEnter;
      } else {
        str += '[Function]' + arrayEnter;
      }
    } else {
      str += j + arrayEnter;
    }
  }
  str = str.substr(0, str.length - arrayEnter.length);
  return str;
}

function switchIntValue(value: Object | symbol): string {
  let str: string = '';
  if (value === '') {
    str += 'NaN';
  } else if (typeof value === 'bigint') {
    str += value + 'n';
  } else if (typeof value === 'symbol') {
    str += 'NaN';
  } else if (typeof value === 'number') {
    str += parseInt(value.toString(), 10); // 10:The function uses decimal.
  } else if (value instanceof Array) {
    if (typeof value[0] === 'number') {
      str += parseInt(value[0].toString(), 10); // 10:The function uses decimal.
    } else if (typeof value[0] === 'string') {
      if (isNaN(Number(value[0]))) {
        str += 'NaN';
      } else {
        str += parseInt(value[0], 10); // 10:The function uses decimal.
      }
    }
  } else if (typeof value === 'string') {
    if (isNaN(Number(value))) {
      str += 'NaN';
    } else {
      str += parseInt(value, 10); // 10:The function uses decimal.
    }
  } else {
    str += 'NaN';
  }
  return str;
}

function switchFloatValue(value: Object | symbol): string {
  let str: string = '';
  if (value === '') {
    str += 'NaN';
  } else if (typeof value === 'symbol') {
    str += 'NaN';
  } else if (typeof value === 'number') {
    str += value;
  } else if (value instanceof Array) {
    if (typeof value[0] === 'number') {
      str += parseFloat(value.toString());
    } else if (typeof value[0] === 'string') {
      if (isNaN(Number(value[0]))) {
        str += 'NaN';
      } else {
        str += parseFloat(value[0]);
      }
    }
  } else if (typeof value === 'string') {
    if (isNaN(Number(value))) {
      str += 'NaN';
    } else {
      str += parseFloat(value);
    }
  } else if (typeof value === 'bigint') {
    str += value;
  } else {
    str += 'NaN';
  }
  return str;
}

function switchNumberValue(value: Object | symbol): string {
  let str: string = '';
  if (value === '') {
    str += '0';
  } else if (typeof value === 'symbol') {
    str += 'NaN';
  } else if (typeof value === 'number') {
    str += value;
  } else if (value instanceof Array) {
    str += 'NaN';
  } else if (typeof value === 'string') {
    if (isNaN(Number(value))) {
      str += 'NaN';
    } else {
      str += Number(value);
    }
  } else if (typeof value === 'bigint') {
    str += value.toString() + 'n';
  } else {
    str += 'NaN';
  }
  return str;
}

function switchStringValue(value: Object | symbol): string {
  let str: string = '';
  if (typeof value === 'undefined') {
    str += 'undefined';
  } else if (typeof value === 'object') {
    if (value === null) {
      str += 'null';
    } else {
      str += value;
    }
  } else if (typeof value === 'symbol') {
    str += value.toString();
  } else {
    str += value;
  }
  return str;
}

function printf(formatString: Array<string | number | Function>, ...valueString: Array<Object>): string {
  let formats: string = helpUtil.dealwithformatstring(formatString);
  let arr: Array<Object> = [];
  arr = formats.split(' ');
  let switchString: Array<Object> = [];
  let valueLength: number = valueString.length;
  let arrLength: number = arr.length;
  let i: number = 0;
  for (let sub of valueString) {
    if (i >= arrLength) {
      break;
    }
    if (arr[i] === 'o') {
      switchString.push(switchLittleObject('\n  ', sub, 1));
    } else if (arr[i] === 'O') {
      switchString.push(switchBigObject('\n  ', sub, 1));
    } else if (arr[i] === 'i') {
      switchString.push(switchIntValue(sub));
    } else if (arr[i] === 'j') {
      switchString.push(JSON.stringify(sub));
    } else if (arr[i] === 'd') {
      switchString.push(switchNumberValue(sub));
    } else if (arr[i] === 's') {
      switchString.push(switchStringValue(sub));
    } else if (arr[i] === 'f') {
      switchString.push(switchFloatValue(sub));
    } else if (arr[i] === 'c') {
      switchString.push(sub.toString());
    }
    ++i;
  }
  while (i < valueLength) {
    switchString.push(valueString[i].toString());
    i++;
  }
  let helpUtilString: string = helpUtil.printf(formatString, ...switchString);
  return helpUtilString;
}

function format(formatString: Array<string | number | Function>, ...valueString: Array<Object>): string {
  if (!(formatString instanceof Array) && (typeof formatString !== 'string')) {
    let error = new BusinessError(`Parameter error. The type of ${formatString} must be string or array`);
    throw error;
  }
  let valueLength: number = valueString.length;
  if (valueLength !== 0) {
    for (let val of valueString) {
      if (typeof val !== 'object' && typeof val !== 'number' &&
        typeof val !== 'function' && typeof val !== 'string') {
        let error = new BusinessError('Parameter error. The type of last parameters must be object');
        throw error;
      }
    }
  }
  let formats: string = helpUtil.dealwithformatstring(formatString);
  let arr: Array<Object> = [];
  arr = formats.split(' ');
  let switchString: Array<Object> = [];
  let arrLength: number = arr.length;
  let i: number = 0;
  for (let sub of valueString) {
    if (i >= arrLength) {
      break;
    }
    if (arr[i] === 'o') {
      switchString.push(switchLittleObject('\n  ', sub, 1));
    } else if (arr[i] === 'O') {
      switchString.push(switchBigObject('\n  ', sub, 1));
    } else if (arr[i] === 'i') {
      switchString.push(switchIntValue(sub));
    } else if (arr[i] === 'j') {
      switchString.push(JSON.stringify(sub));
    } else if (arr[i] === 'd') {
      switchString.push(switchNumberValue(sub));
    } else if (arr[i] === 's') {
      switchString.push(switchStringValue(sub));
    } else if (arr[i] === 'f') {
      switchString.push(switchFloatValue(sub));
    } else if (arr[i] === 'c') {
      switchString.push(sub.toString());
    }
    ++i;
  }
  while (i < valueLength) {
    switchString.push(valueString[i].toString());
    i++;
  }
  let helpUtilString: string = helpUtil.printf(formatString, ...switchString);
  return helpUtilString;
}

function getErrorString(errnum: number): string {
  let errorString: string = helpUtil.geterrorstring(errnum);
  return errorString;
}

function errnoToString(errnum: number): string {
  if (typeof errnum !== 'number') {
    let error = new BusinessError(`Parameter error. The type of ${errnum} must be number`);
    throw error;
  }
  let errorString: string = helpUtil.geterrorstring(errnum);
  return errorString;
}

function randomUUID(entropyCache?: boolean): string {
  if (entropyCache === undefined || entropyCache === null) {
    entropyCache = true;
  }
  if (typeof entropyCache !== 'boolean') {
    let error = new BusinessError(`Parameter error. The type of ${entropyCache} must be boolean`);
    throw error;
  }
  let uuidString: string = helpUtil.randomUUID(entropyCache);
  return uuidString;
}

function randomBinaryUUID(entropyCache?: boolean): Uint8Array {
  if (entropyCache === undefined || entropyCache === null) {
    entropyCache = true;
  }
  if (typeof entropyCache !== 'boolean') {
    let error = new BusinessError(`Parameter error. The type of ${entropyCache} must be boolean`);
    throw error;
  }
  let uuidArray: Uint8Array = helpUtil.randomBinaryUUID(entropyCache);
  return uuidArray;
}

function parseUUID(uuid: string): Uint8Array {
  let format = /[0-9a-fA-F]{8}(-[0-9a-fA-F]{4}){3}-[0-9a-fA-F]{12}/;
  if (!format.test(uuid)) {
    let error = new BusinessError(`Syntax Error.Invalid ${uuid} string`);
    error.code = syntaxErrorCode;
    throw error;
  }
  let uuidArray: Uint8Array = helpUtil.parseUUID(uuid);
  return uuidArray;
}

function getHash(obj: object): number {
  let result: number = helpUtil.getHash(obj);
  return result;
}

function callbackified(original: Function, ...args: Array<string | number | Function>): void {
  const maybeCb = args.pop();
  if (typeof maybeCb !== 'function') {
    throw new Error('maybe is not function');
  }
  const cb = (...args: Array<null>) : void => {
    Reflect.apply(maybeCb, this, args);
  };
  Reflect.apply(original, this, args).then((ret: null) => cb(null, ret), (rej: null) => cb(rej));
}

function getOwnPropertyDescriptors(obj: Function): PropertyDescriptorMap {
  const result: PropertyDescriptorMap = {};
  for (let key of Reflect.ownKeys(obj)) {
    if (typeof key === 'string') {
      result[key] = Object.getOwnPropertyDescriptor(obj, key);
    }
  }
  return result;
}

function callbackWrapper(original: Function): Function {
  if (typeof original !== 'function') {
    let error = new BusinessError(`Parameter error. The type of ${original} must be function`);
    throw error;
  }
  if (original.constructor.name !== 'AsyncFunction') {
    console.error('callbackWrapper: The type of Parameter must be AsyncFunction');
  }
  const descriptors = getOwnPropertyDescriptors(original);
  if (typeof descriptors.length.value === 'number') {
    descriptors.length.value++;
  }
  if (typeof descriptors.name.value === 'string') {
    descriptors.name.value += 'callbackified';
  }
  function cb(...args: Array<string | number | Function>): void {
    callbackified(original, ...args);
  }
  Object.defineProperties(cb, descriptors);
  return cb;
}

function promiseWrapper(func: Function): Object {
  return function (...args: Array<Object>) {
    return new Promise((resolve, reject) => {
      let callback: Function = function (err: Object | string, ...values: Array<Object>) {
        if (err) {
          reject(err);
        } else {
          resolve(values);
        }
      };
      func.apply(null, [...args, callback]);
    });
  };
}

function promisify(func: Function): Function {
  if (typeof func !== 'function') {
    let error = new BusinessError(`Parameter error. The type of ${func} must be function`);
    throw error;
  }
  return function (...args: Array<Object>) {
    return new Promise((resolve, reject) => {
      let callback: Function = function (err: Object | string, ...values: Array<Object>) {
        if (err) {
          reject(err);
        } else {
          resolve(values);
        }
      };
      func.apply(null, [...args, callback]);
    });
  };
}

interface TextDecoder {
  new(encoding?: string, flags?: number): TextDecoder;
}

class TextDecoder {
  encodeStr: string = 'utf-8';
  flags: number = 0;
  isIgnoreBOM: boolean = false;
  isFatal: boolean = false;
  textDecoder: TextDecoder;
  constructor(encoding?: string, options?: { fatal?: boolean; ignoreBOM?: boolean }) {
    if (encoding) {
      this.encodeStr = encoding;
    }
    let flags = 0;
    if (arguments.length === 0) {
      this.textDecoder = new helpUtil.TextDecoder();
    } else if (arguments.length === 1) {
      this.textDecoder = new helpUtil.TextDecoder(encoding);
    } else {
      if (options) {
        flags |= options.fatal ? CONVERTER_FLAGS_FATAL : 0;
        flags |= options.ignoreBOM ? CONVERTER_FLAGS_IGNORE_BOM : 0;
      }
      this.isFatal = options?.fatal;
      this.isIgnoreBOM = options?.ignoreBOM;
      this.textDecoder = new helpUtil.TextDecoder(encoding, flags);
    }
    this.flags = flags;
  }

  static create(encoding?: string, options?: { fatal?: boolean; ignoreBOM?: boolean }): TextDecoder {
    if (arguments.length === 0) {
      return new TextDecoder();
    } else if (arguments.length === 1) {
      if (typeof encoding !== 'string' && encoding !== undefined && encoding !== null) {
        throw new BusinessError(`Parameter error. The type of ${encoding} must be string`);
      }
      return new TextDecoder(encoding);
    } else {
      if (typeof encoding !== 'string' && encoding !== undefined && encoding !== null) {
        throw new BusinessError(`Parameter error. The type of ${encoding} must be string`);
      }
      if (typeof options !== 'object' && options !== undefined && options !== null) {
        throw new BusinessError(`Parameter error. The type of ${options} must be object`);
      }
      return new TextDecoder(encoding, options);
    }
  }

  public decodeToString(input: Uint8Array, options?: { stream?: boolean }): string {
    if (input === null) {
      throw new BusinessError(`Parameter error. The type of Parameter must be Uint8Array.`);
    }
    if (arguments.length === 0 || input === undefined || input.length === 0) {
      return '';
    }
    if (arguments.length === 1) {
      return this.textDecoder.decodeToString(input);
    }
    return this.textDecoder.decodeToString(input, options);
  }

  public decodeWithStream(input: Uint8Array, options?: { stream?: boolean }): string {
    let uint8: Uint8Array = new Uint8Array(input);
    if (arguments.length === 1) {
      return this.textDecoder.decodeWithStream(uint8);
    }
    return this.textDecoder.decodeWithStream(uint8, options);
  }

  public decode(input: Uint8Array, options?: { stream?: boolean }): string {
    if (arguments.length === 1) {
      return this.textDecoder.decode(input);
    }
    return this.textDecoder.decode(input, options);
  }

  get encoding(): string {
    return this.encodeStr;
  }

  get fatal(): boolean {
    return this.isFatal;
  }

  get ignoreBOM(): boolean {
    return this.isIgnoreBOM;
  }
}

class LruBuffer {
  private cache: Map<Object | undefined, Object | undefined>;
  // Default current size
  private maxSize: number = 64;
  // Default maximum size
  private maxNumber: number = 2147483647;
  private putCount: number = 0;
  private createCount: number = 0;
  private evictionCount: number = 0;
  private hitCount: number = 0;
  private missCount: number = 0;
  public length: number = 0;

  public constructor(capacity?: number) {
    if (capacity !== undefined && capacity !== null) {
      if (capacity <= 0 || capacity % 1 !== 0 || capacity > this.maxNumber) {
        throw new Error('data error');
      }
      this.maxSize = capacity;
    }
    this.cache = new Map();
  }

  public updateCapacity(newCapacity: number): void {
    if (newCapacity <= 0 || newCapacity % 1 !== 0 || newCapacity > this.maxNumber) {
      throw new Error('data error');
    } else if (this.cache.size > newCapacity) {
      this.changeCapacity(newCapacity);
    }
    this.length = this.cache.size;
    this.maxSize = newCapacity;
  }

  public get(key: Object): Object {
    if (key === null) {
      throw new Error('key not be null');
    }
    let value: Object;
    if (this.cache.has(key)) {
      value = this.cache.get(key);
      this.hitCount++;
      this.cache.delete(key);
      this.cache.set(key, value);
      return value;
    }

    this.missCount++;
    let createValue: Object = this.createDefault(key);
    if (createValue === undefined) {
      return undefined;
    } else {
      value = this.put(key, createValue);
      this.createCount++;
      if (value !== undefined) {
        this.put(key, value);
        this.afterRemoval(false, key, createValue, value);
        return value;
      }
      return createValue;
    }
  }

  public put(key: Object, value: Object): Object {
    if (key === null || value === null) {
      throw new Error('key or value not be null');
    }
    let former: Object = undefined;
    this.putCount++;
    if (this.cache.has(key)) {
      former = this.cache.get(key);
      this.cache.delete(key);
      this.afterRemoval(false, key, former, value);
    } else if (this.cache.size >= this.maxSize) {
      this.afterRemoval(true, this.cache.keys().next().value, this.cache.values().next().value, null);
      this.cache.delete(this.cache.keys().next().value);
      this.evictionCount++;
    }
    this.cache.set(key, value);
    this.length = this.cache.size;
    former = this.cache.get(key);
    return former;
  }

  public getCreateCount(): number {
    return this.createCount;
  }

  public getMissCount(): number {
    return this.missCount;
  }

  public getRemovalCount(): number {
    return this.evictionCount;
  }

  public getMatchCount(): number {
    return this.hitCount;
  }

  public getPutCount(): number {
    return this.putCount;
  }

  public getCapacity(): number {
    return this.maxSize;
  }

  public clear(): void {
    this.afterRemoval(false, this.cache.keys(), this.cache.values(), null);
    this.cache.clear();
    this.length = this.cache.size;
  }

  public isEmpty(): boolean {
    let temp: boolean = false;
    if (this.cache.size === 0) {
      temp = true;
    }
    return temp;
  }

  public contains(key: Object): boolean {
    let flag: boolean = false;
    if (this.cache.has(key)) {
      flag = true;
      let value: Object;
      this.hitCount++;
      value = this.cache.get(key);
      this.cache.delete(key);
      this.cache.set(key, value);
      this.length = this.cache.size;
      return flag;
    }
    this.missCount++;
    return flag;
  }

  public remove(key: Object): Object {
    if (key === null) {
      throw new Error('key not be null');
    } else if (this.cache.has(key)) {
      let former: Object;
      former = this.cache.get(key);
      this.cache.delete(key);
      if (former !== null) {
        this.afterRemoval(false, key, former, null);
        this.length = this.cache.size;
        return former;
      }
    }
    this.length = this.cache.size;
    return undefined;
  }

  public toString(): string {
    let peek: number = 0;
    let hitRate: number = 0;
    peek = this.hitCount + this.missCount;
    if (peek !== 0) {
      // The value is 100 times larger
      hitRate = 100 * this.hitCount / peek;
    } else {
      hitRate = 0;
    }
    let str: string = '';
    str = 'Lrubuffer[ maxSize = ' + this.maxSize + ', hits = ' + this.hitCount +
      ', misses = ' + this.missCount + ', hitRate = ' + hitRate + '% ]';
    return str;
  }

  public values(): Object[] {
    let arr: Array<Object> = [];
    for (let value of this.cache.values()) {
      arr.push(value);
    }
    return arr;
  }

  public keys(): Object[] {
    let arr: Array<Object> = Array.from(this.cache.keys());
    return arr;
  }

  protected afterRemoval(isEvict: boolean, key: Object | undefined | null, value: Object | undefined | null,
    newValue: Object | undefined | null): void {
  }

  protected createDefault(key: Object): Object {
    return undefined;
  }

  public entries(): IterableIterator<[Object, Object]> {
    return this.cache.entries();
  }

  public [Symbol.iterator](): IterableIterator<[Object, Object]> {
    return this.cache.entries();
  }

  private changeCapacity(newCapacity: number): void {
    while (this.cache.size > newCapacity) {
      this.cache.delete(this.cache.keys().next().value);
      this.evictionCount++;
      this.afterRemoval(true, this.cache.keys(), this.cache.values(), null);
    }
  }
}

class LRUCache {
  private cache: Map<Object | undefined, Object | undefined>;
  // Default current size
  private maxSize: number = 64;
  // Default maximum size
  private maxNumber: number = 2147483647;
  private putCount: number = 0;
  private createCount: number = 0;
  private evictionCount: number = 0;
  private hitCount: number = 0;
  private missCount: number = 0;
  public length: number = 0;

  public constructor(capacity?: number) {
    if (capacity !== undefined && capacity !== null) {
      if (capacity <= 0 || capacity % 1 !== 0 || capacity > this.maxNumber) {
        let error = new BusinessError(`Parameter error. The type of ${capacity} must be small integer`);
        throw error;
      }
      this.maxSize = capacity;
    }
    this.cache = new Map();
  }

  private changeCapacity(newCapacity: number): void {
    while (this.cache.size > newCapacity) {
      this.cache.delete(this.cache.keys().next().value);
      this.evictionCount++;
      this.afterRemoval(true, this.cache.keys(), this.cache.values(), null);
    }
  }

  protected afterRemoval(isEvict: boolean, key: Object | undefined | null, value: Object | undefined | null,
    newValue: Object | undefined | null): void {
  }

  protected createDefault(key: Object): Object {
    if (typeof (key as Object) === 'undefined') {
      let error = new BusinessError(`Parameter error. The type of ${key} must be Object`);
      throw error;
    }
    return undefined;
  }

  public updateCapacity(newCapacity: number): void {
    if (typeof newCapacity !== 'number') {
      let error = new BusinessError(`Parameter error. The type of ${newCapacity} must be number`);
      throw error;
    }
    if (newCapacity <= 0 || newCapacity % 1 !== 0 || newCapacity > this.maxNumber) {
      let error = new BusinessError(`Parameter error. The type of ${newCapacity} must be small integer`);
      throw error;
    } else if (this.cache.size > newCapacity) {
      this.changeCapacity(newCapacity);
    }
    this.length = this.cache.size;
    this.maxSize = newCapacity;
  }

  public get(key: Object): Object {
    if (typeof (key as Object) === 'undefined' || key === null) {
      let error = new BusinessError(`Parameter error. The type of ${key} must be Object`);
      throw error;
    }
    let value: Object;
    if (this.cache.has(key)) {
      value = this.cache.get(key);
      this.hitCount++;
      this.cache.delete(key);
      this.cache.set(key, value);
      return value;
    }

    this.missCount++;
    let createValue: Object = this.createDefault(key);
    if (createValue === undefined) {
      return undefined;
    } else {
      value = this.put(key, createValue);
      this.createCount++;
      if (value !== undefined) {
        this.put(key, value);
        this.afterRemoval(false, key, createValue, value);
        return value;
      }
      return createValue;
    }
  }

  public put(key: Object, value: Object): Object {
    if (typeof (key as Object) === 'undefined') {
      let error = new BusinessError(`Parameter error. The type of ${key} must be Object`);
      throw error;
    }
    if (typeof (value as Object) === 'undefined') {
      let error = new BusinessError(`Parameter error. The type of ${value} must be Object`);
      throw error;
    }
    if (key === null || value === null) {
      let error = new BusinessError(`Parameter error. The type of key and value must be Object`);
      throw error;
    }
    let former: Object = undefined;
    this.putCount++;
    if (this.cache.has(key)) {
      former = this.cache.get(key);
      this.cache.delete(key);
      this.afterRemoval(false, key, former, value);
    } else if (this.cache.size >= this.maxSize) {
      this.afterRemoval(true, this.cache.keys().next().value, this.cache.values().next().value, null);
      this.cache.delete(this.cache.keys().next().value);
      this.evictionCount++;
    }
    this.cache.set(key, value);
    this.length = this.cache.size;
    former = this.cache.get(key);
    return former;
  }

  public remove(key: Object): Object {
    if (typeof (key as Object) === 'undefined' || key === null) {
      let error = new BusinessError(`Parameter error. The type of ${key} must be Object`);
      throw error;
    }
    if (this.cache.has(key)) {
      let former: Object = this.cache.get(key);
      this.cache.delete(key);
      if (former !== null) {
        this.afterRemoval(false, key, former, null);
        this.length = this.cache.size;
        return former;
      }
    }
    this.length = this.cache.size;
    return undefined;
  }

  public contains(key: Object): boolean {
    if (typeof (key as Object) === 'undefined') {
      let error = new BusinessError(`Parameter error. The type of ${key} must be Object`);
      throw error;
    }
    let flag: boolean = false;
    if (this.cache.has(key)) {
      flag = true;
      this.hitCount++;
      let value: Object = this.cache.get(key);
      this.cache.delete(key);
      this.cache.set(key, value);
      this.length = this.cache.size;
      return flag;
    }
    this.missCount++;
    return flag;
  }

  public getCreateCount(): number {
    return this.createCount;
  }

  public getMissCount(): number {
    return this.missCount;
  }

  public getRemovalCount(): number {
    return this.evictionCount;
  }

  public getMatchCount(): number {
    return this.hitCount;
  }

  public getPutCount(): number {
    return this.putCount;
  }

  public getCapacity(): number {
    return this.maxSize;
  }

  public clear(): void {
    this.afterRemoval(false, this.cache.keys(), this.cache.values(), null);
    this.cache.clear();
    this.length = this.cache.size;
  }

  public isEmpty(): boolean {
    return this.cache.size === 0;
  }

  public toString(): string {
    let peek: number = 0;
    let hitRate: number = 0;
    peek = this.hitCount + this.missCount;
    if (peek !== 0) {
      // The value is 100 times larger
      hitRate = 100 * this.hitCount / peek;
    }
    let str: string = '';
    str = 'LRUCache[ maxSize = ' + this.maxSize + ', hits = ' + this.hitCount +
      ', misses = ' + this.missCount + ', hitRate = ' + hitRate + '% ]';
    return str;
  }

  public values(): Object[] {
    let arr: Array<Object> = [];
    for (let value of this.cache.values()) {
      arr.push(value);
    }
    return arr;
  }

  public keys(): Object[] {
    let arr: Array<Object> = [];
    for (let key of this.cache.keys()) {
      arr.push(key);
    }
    return arr;
  }

  public entries(): IterableIterator<[Object, Object]> {
    return this.cache.entries();
  }

  public [Symbol.iterator](): IterableIterator<[Object, Object]> {
    return this.cache.entries();
  }
}

class RationalNumber {
  private mnum: number = 0;
  private mden: number = 0;

  public constructor();
  public constructor(num: number, den: number);
  public constructor(num?: number, den?: number) {
    if (num || den) {
      num = den < 0 ? num * (-1) : num;
      den = den < 0 ? den * (-1) : den;
      if (den === 0) {
        if (num > 0) {
          this.mnum = 1;
          this.mden = 0;
        } else if (num < 0) {
          this.mnum = -1;
          this.mden = 0;
        } else {
          this.mnum = 0;
          this.mden = 0;
        }
      } else if (num === 0) {
        this.mnum = 0;
        this.mden = 1;
      } else {
        let gnum: number = 0;
        gnum = this.getCommonDivisor(num, den);
        if (gnum !== 0) {
          this.mnum = num / gnum;
          this.mden = den / gnum;
        }
      }
    }
  }

  static isNumeric(str: string): boolean {
    return !isNaN(parseFloat(str)) && isFinite(+str);
  }

  static parseRationalNumber(num: number, den: number): RationalNumber {
    if (typeof num !== 'number') {
      let error = new BusinessError(`Parameter error. The type of ${num} must be number`);
      throw error;
    }
    if (typeof den !== 'number') {
      let error = new BusinessError(`Parameter error. The type of ${den} must be number`);
      throw error;
    }
    if (!Number.isInteger(num) || !Number.isInteger(den)) {
      console.error('parseRationalNumber: The type of Parameter must be integer');
    }
    num = den < 0 ? num * (-1) : num;
    den = den < 0 ? den * (-1) : den;
    let ratNum = new RationalNumber();
    if (den === 0) {
      if (num > 0) {
        ratNum.mnum = 1;
        ratNum.mden = 0;
      } else if (num < 0) {
        ratNum.mnum = -1;
        ratNum.mden = 0;
      } else {
        ratNum.mnum = 0;
        ratNum.mden = 0;
      }
    } else if (num === 0) {
      ratNum.mnum = 0;
      ratNum.mden = 1;
    } else {
      let gnum: number = 0;
      gnum = this.getCommonFactor(num, den);
      if (gnum !== 0) {
        ratNum.mnum = num / gnum;
        ratNum.mden = den / gnum;
      }
    }
    return ratNum;
  }

  static createRationalFromString(str: string): RationalNumber {
    if (typeof str !== 'string' || str === null) {
      let error = new BusinessError(`Parameter error. The type of ${str} must be string`);
      throw error;
    }
    let colon: number = str.indexOf(':');
    let semicolon: number = str.indexOf('/');
    if ((colon < 0 && semicolon < 0) || (colon > 0 && semicolon > 0)) {
      let error = new BusinessError(`Parameter error. The type of ${str} must be effective string`);
      throw error;
    }
    let index: number = (colon > 0) ? colon : semicolon;
    let str1: string = str.substr(0, index);
    let str2: string = str.substr(index + 1, str.length);
    if (RationalNumber.isNumeric(str1) && RationalNumber.isNumeric(str2)) {
      let num1: number = Number(str1);
      let num2: number = Number(str2);
      if (!Number.isInteger(num1) || !Number.isInteger(num2)) {
        console.error('createRationalFromString: The type of Parameter must be integer string');
      }
      return RationalNumber.parseRationalNumber(num1, num2);
    } else {
      let error = new BusinessError(`Parameter error. The type of ${str} must be character string`);
      throw error;
    }
  }

  public compareTo(other: RationalNumber): number {
    if (this.mnum === other.mnum && this.mden === other.mden) {
      return 0;
    } else if (this.mnum === 0 && this.mden === 0) {
      return 1;
    } else if ((other.mnum === 0) && (other.mden === 0)) {
      return -1;
    } else if ((this.mden === 0 && this.mnum > 0) || (other.mden === 0 && other.mnum < 0)) {
      return 1;
    } else if ((this.mden === 0 && this.mnum < 0) || (other.mden === 0 && other.mnum > 0)) {
      return -1;
    }
    let thisnum: number = this.mnum * other.mden;
    let othernum: number = other.mnum * this.mden;
    if (thisnum < othernum) {
      return -1;
    } else if (thisnum > othernum) {
      return 1;
    } else {
      return 0;
    }
  }

  public compare(other: RationalNumber): number {
    if (!(other instanceof RationalNumber)) {
      let error = new BusinessError(`Parameter error. The type of ${other} must be RationalNumber`);
      throw error;
    }
    if (this.mnum === other.mnum && this.mden === other.mden) {
      return 0;
    } else if (this.mnum === 0 && this.mden === 0) {
      return 1;
    } else if ((other.mnum === 0) && (other.mden === 0)) {
      return -1;
    } else if ((this.mden === 0 && this.mnum > 0) || (other.mden === 0 && other.mnum < 0)) {
      return 1;
    } else if ((this.mden === 0 && this.mnum < 0) || (other.mden === 0 && other.mnum > 0)) {
      return -1;
    }
    let thisnum: number = this.mnum * other.mden;
    let othernum: number = other.mnum * this.mden;
    if (thisnum < othernum) {
      return -1;
    } else if (thisnum > othernum) {
      return 1;
    } else {
      return 0;
    }
  }

  public equals(obj: object): boolean {
    if (!(obj instanceof RationalNumber)) {
      return false;
    }
    let thisnum: number = this.mnum * obj.mden;
    let objnum: number = obj.mnum * this.mden;
    if (this.mnum === obj.mnum && this.mden === obj.mden) {
      return true;
    } else if ((thisnum === objnum) && (this.mnum !== 0 && this.mden !== 0) && (obj.mnum !== 0 && obj.mden !== 0)) {
      return true;
    } else if ((this.mnum === 0 && this.mden !== 0) && (obj.mnum === 0 && obj.mden !== 0)) {
      return true;
    } else if ((this.mnum > 0 && this.mden === 0) && (obj.mnum > 0 && obj.mden === 0)) {
      return true;
    } else if ((this.mnum < 0 && this.mden === 0) && (obj.mnum < 0 && obj.mden === 0)) {
      return true;
    } else {
      return false;
    }
  }

  public valueOf(): number {
    if (this.mnum > 0 && this.mden === 0) {
      return Number.POSITIVE_INFINITY;
    } else if (this.mnum < 0 && this.mden === 0) {
      return Number.NEGATIVE_INFINITY;
    } else if ((this.mnum === 0) && (this.mden === 0)) {
      return Number.NaN;
    } else {
      return this.mnum / this.mden;
    }
  }

  public getCommonDivisor(number1: number, number2: number): number {
    if (number1 === 0 || number2 === 0) {
      throw new Error('Parameter cannot be zero!');
    }
    let temp: number = 0;
    if (number1 < number2) {
      temp = number1;
      number1 = number2;
      number2 = temp;
    }
    while (number1 % number2 !== 0) {
      temp = number1 % number2;
      number1 = number2;
      number2 = temp;
    }
    return number2;
  }

  static getCommonFactor(firNum: number, SecNum: number): number {
    if (typeof firNum !== 'number') {
      let error = new BusinessError(`Parameter error. The type of ${firNum} must be number`);
      throw error;
    }
    if (typeof SecNum !== 'number') {
      let error = new BusinessError(`Parameter error. The type of ${SecNum} must be number`);
      throw error;
    }
    if (firNum === 0 || SecNum === 0) {
      let error = new BusinessError(`Parameter error. The Parameter cannot be zero`);
      throw error;
    }
    if (!Number.isInteger(firNum) || !Number.isInteger(SecNum) ) {
      console.error('getCommonFactor: The type of Parameter must be integer');
    }

    let temp: number = 0;
    if (firNum < SecNum) {
      temp = firNum;
      firNum = SecNum;
      SecNum = temp;
    }
    while (firNum % SecNum !== 0) {
      temp = firNum % SecNum;
      firNum = SecNum;
      SecNum = temp;
    }
    return SecNum;
  }

  public getDenominator(): number {
    return this.mden;
  }

  public getNumerator(): number {
    return this.mnum;
  }

  public isFinite(): boolean {
    return this.mden !== 0;
  }

  public isNaN(): boolean {
    return this.mnum === 0 && this.mden === 0;
  }

  public isZero(): boolean {
    return this.mnum === 0 && this.mden !== 0;
  }

  public toString(): string {
    let buf: string;
    if (this.mnum === 0 && this.mden === 0) {
      buf = 'NaN';
    } else if (this.mnum > 0 && this.mden === 0) {
      buf = 'Infinity';
    } else if (this.mnum < 0 && this.mden === 0) {
      buf = '-Infinity';
    } else {
      buf = String(this.mnum) + '/' + String(this.mden);
    }
    return buf;
  }
}

interface ScopeComparable {
  compareTo(other: ScopeComparable): boolean;
}

type ScopeType = ScopeComparable;

class Scope {
  private readonly _lowerLimit: ScopeType;
  private readonly _upperLimit: ScopeType;

  public constructor(readonly lowerObj: ScopeType, readonly upperObj: ScopeType) {
    this.checkNull(lowerObj, 'lower limit not be null');
    this.checkNull(upperObj, 'upper limit not be null');

    if (lowerObj.compareTo(upperObj)) {
      throw new Error('lower limit must be less than or equal to upper limit');
    }
    this._lowerLimit = lowerObj;
    this._upperLimit = upperObj;
  }

  public getLower(): ScopeType {
    return this._lowerLimit;
  }

  public getUpper(): ScopeType {
    return this._upperLimit;
  }

  public compareTo(): boolean {
    return false;
  }

  public contains(value: ScopeType): boolean;
  public contains(scope: Scope): boolean;
  public contains(x: Scope | ScopeType): boolean {
    let resLower: boolean;
    let resUpper: boolean;
    this.checkNull(x, 'value must not be null');
    if (x instanceof Scope) {
      resLower = x._lowerLimit.compareTo(this._lowerLimit);
      resUpper = this._upperLimit.compareTo(x._upperLimit);
    } else {
      resLower = x.compareTo(this._lowerLimit);
      resUpper = this._upperLimit.compareTo(x);
    }
    return resLower && resUpper;
  }

  public clamp(value: ScopeType): ScopeType {
    this.checkNull(value, 'value must not be null');
    if (!value.compareTo(this._lowerLimit)) {
      return this._lowerLimit;
    } else if (value.compareTo(this._upperLimit)) {
      return this._upperLimit;
    } else {
      return value;
    }
  }

  public intersect(scope: Scope): Scope;
  public intersect(lowerObj: ScopeType, upperObj: ScopeType): Scope;
  public intersect(x: Scope, y?: Scope | ScopeType): Scope {
    let reLower: boolean;
    let reUpper: boolean;
    let mLower: ScopeType;
    let mUpper: ScopeType;
    if (y) {
      this.checkNull(x, 'lower limit must not be null');
      this.checkNull(y, 'upper limit must not be null');
      reLower = this._lowerLimit.compareTo(x);
      reUpper = y.compareTo(this._upperLimit);
      if (reLower && reUpper) {
        return this;
      } else {
        mLower = reLower ? this._lowerLimit : x;
        mUpper = reUpper ? this._upperLimit : y;
        return new Scope(mLower, mUpper);
      }
    } else {
      this.checkNull(x, 'scope must not be null');
      reLower = this._lowerLimit.compareTo(x._lowerLimit);
      reUpper = x._upperLimit.compareTo(this._upperLimit);
      if (!reLower && !reUpper) {
        return x;
      } else if (reLower && reUpper) {
        return this;
      } else {
        mLower = reLower ? this._lowerLimit : x._lowerLimit;
        mUpper = reUpper ? this._upperLimit : x._upperLimit;
        return new Scope(mLower, mUpper);
      }
    }
  }

  public expand(obj: ScopeType): Scope;
  public expand(scope: Scope): Scope;
  public expand(lowerObj: ScopeType, upperObj: ScopeType): Scope;
  public expand(x: ScopeType, y?: ScopeType): Scope {
    let reLower: boolean;
    let reUpper: boolean;
    let mLower: ScopeType;
    let mUpper: ScopeType;
    if (!y) {
      this.checkNull(x, 'value must not be null');
      if (!(x instanceof Scope)) {
        this.checkNull(x, 'value must not be null');
        return this.expand(x, x);
      }
      reLower = x._lowerLimit.compareTo(this._lowerLimit);
      reUpper = this._upperLimit.compareTo(x._upperLimit);
      if (reLower && reUpper) {
        return this;
      } else if (!reLower && !reUpper) {
        return x;
      } else {
        mLower = reLower ? this._lowerLimit : x._lowerLimit;
        mUpper = reUpper ? this._upperLimit : x._upperLimit;
        return new Scope(mLower, mUpper);
      }

    } else {
      this.checkNull(x, 'lower limit must not be null');
      this.checkNull(y, 'upper limit must not be null');
      reLower = x.compareTo(this._lowerLimit);
      reUpper = this._upperLimit.compareTo(y);
      if (reLower && reUpper) {
        return this;
      }
      mLower = reLower ? this._lowerLimit : x;
      mUpper = reUpper ? this._upperLimit : y;
      return new Scope(mLower, mUpper);
    }
  }

  public toString(): string {
    let strLower: string = this._lowerLimit.toString();
    let strUpper: string = this._upperLimit.toString();
    return `[${strLower}, ${strUpper}]`;
  }

  public checkNull(o: ScopeType, str: string): void {
    if (o === null) {
      throw new Error(str);
    }
  }
}

class ScopeHelper {
  private readonly _lowerLimit: ScopeType;
  private readonly _upperLimit: ScopeType;
  public constructor(readonly lowerObj: ScopeType, readonly upperObj: ScopeType) {
    if (typeof lowerObj !== 'object') {
      let error = new BusinessError(`Parameter error. The type of ${lowerObj} must be object`);
      throw error;
    }
    if (typeof upperObj !== 'object') {
      let error = new BusinessError(`Parameter error. The type of ${upperObj} must be object`);
      throw error;
    }

    this.checkNull(lowerObj, 'lower limit not be null');
    this.checkNull(upperObj, 'upper limit not be null');

    if (lowerObj.compareTo(upperObj)) {
      throw new Error('lower limit must be less than or equal to upper limit');
    }
    this._lowerLimit = lowerObj;
    this._upperLimit = upperObj;
  }

  public getLower(): ScopeType {
    return this._lowerLimit;
  }

  public getUpper(): ScopeType {
    return this._upperLimit;
  }

  public compareTo(): boolean {
    return false;
  }

  public contains(value: ScopeType): boolean;
  public contains(scope: ScopeHelper): boolean;
  public contains(x: ScopeHelper | ScopeType): boolean {
    this.checkNull(x, 'value must not be null');
    if (typeof x !== 'object') {
      let error = new BusinessError(`Parameter error. The type of ${x} must be object or ScopeHelper`);
      throw error;
    }
    let resLower: boolean;
    let resUpper: boolean;
    if (x instanceof ScopeHelper) {
      resLower = x._lowerLimit.compareTo(this._lowerLimit);
      resUpper = this._upperLimit.compareTo(x._upperLimit);
    } else {
      resLower = x.compareTo(this._lowerLimit);
      resUpper = this._upperLimit.compareTo(x);
    }
    return resLower && resUpper;
  }

  public clamp(value: ScopeType): ScopeType {
    this.checkNull(value, 'value must not be null');
    if (typeof value !== 'object') {
      let error = new BusinessError(`Parameter error. The type of ${value} must be object`);
      throw error;
    }

    if (!value.compareTo(this._lowerLimit)) {
      return this._lowerLimit;
    } else if (value.compareTo(this._upperLimit)) {
      return this._upperLimit;
    } else {
      return value;
    }
  }

  public intersect(scope: ScopeHelper): ScopeHelper;
  public intersect(lowerObj: ScopeType, upperObj: ScopeType): ScopeHelper;
  public intersect(x: ScopeHelper, y?: ScopeType): ScopeHelper {
    if (typeof x !== 'object') {
      let error = new BusinessError(`Parameter error. The type of ${x} must be ScopeHelper or ScopeType`);
      throw error;
    }
    let reLower: boolean;
    let reUpper: boolean;
    let mLower: ScopeType;
    let mUpper: ScopeType;
    if (y) {
      this.checkNull(x, 'lower limit must not be null');
      this.checkNull(y, 'upper limit must not be null');
      if (typeof y !== 'object') {
        let error = new BusinessError(`Parameter error. The type of ${y} must be ScopeType`);
        throw error;
      }
      reLower = this._lowerLimit.compareTo(x);
      reUpper = y.compareTo(this._upperLimit);
      if (reLower && reUpper) {
        return this;
      } else {
        mLower = reLower ? this._lowerLimit : x;
        mUpper = reUpper ? this._upperLimit : y;
        return new ScopeHelper(mLower, mUpper);
      }
    } else {
      this.checkNull(x, 'scope must not be null');
      reLower = this._lowerLimit.compareTo(x._lowerLimit);
      reUpper = x._upperLimit.compareTo(this._upperLimit);
      if (!reLower && !reUpper) {
        return x;
      } else if (reLower && reUpper) {
        return this;
      } else {
        mLower = reLower ? this._lowerLimit : x._lowerLimit;
        mUpper = reUpper ? this._upperLimit : x._upperLimit;
        return new ScopeHelper(mLower, mUpper);
      }
    }
  }

  public expand(obj: ScopeType): ScopeHelper;
  public expand(scope: ScopeHelper): ScopeHelper;
  public expand(lowerObj: ScopeType, upperObj: ScopeType): ScopeHelper;
  public expand(x: ScopeType, y?: ScopeType): ScopeHelper {
    if (typeof x !== 'object') {
      let error = new BusinessError(`Parameter error. The type of ${x} must be ScopeHelper or ScopeType`);
      throw error;
    }
    let reLower: boolean;
    let reUpper: boolean;
    let mLower: ScopeType;
    let mUpper: ScopeType;
    if (!y) {
      this.checkNull(x, 'value must not be null');
      if (!(x instanceof ScopeHelper)) {
        this.checkNull(x, 'value must not be null');
        return this.expand(x, x);
      }
      reLower = x._lowerLimit.compareTo(this._lowerLimit);
      reUpper = this._upperLimit.compareTo(x._upperLimit);
      if (reLower && reUpper) {
        return this;
      } else if (!reLower && !reUpper) {
        return x;
      } else {
        mLower = reLower ? this._lowerLimit : x._lowerLimit;
        mUpper = reUpper ? this._upperLimit : x._upperLimit;
        return new ScopeHelper(mLower, mUpper);
      }

    } else {
      if (typeof y !== 'object') {
        let error = new BusinessError(`Parameter error. The type of ${y} must be ScopeType`);
        throw error;
      }

      this.checkNull(x, 'lower limit must not be null');
      this.checkNull(y, 'upper limit must not be null');
      reLower = x.compareTo(this._lowerLimit);
      reUpper = this._upperLimit.compareTo(y);
      if (reLower && reUpper) {
        return this;
      }
      mLower = reLower ? this._lowerLimit : x;
      mUpper = reUpper ? this._upperLimit : y;
      return new ScopeHelper(mLower, mUpper);
    }
  }

  public toString(): string {
    let strLower: string = this._lowerLimit.toString();
    let strUpper: string = this._upperLimit.toString();
    return `[${strLower}, ${strUpper}]`;
  }

  public checkNull(o: ScopeType, str: string): void {
    if (o === null) {
      throw new Error(str);
    }
  }
}

class Aspect {
  private static checkMethodType(func: Function, methodName: string): boolean {
    if (typeof func !== 'function') {
      let error = new BusinessError(`Parameter error. The type of ${methodName} must be a method of targetClass`);
      throw error;
    }
    return func.constructor.name === 'AsyncFunction';
  }

  private static checkParameters(targetClass: Object, methodName: string, isStatic: boolean): void {
    if (!(targetClass instanceof Object)) {
      let error = new BusinessError(`Parameter error. The type of ${targetClass} must be Object`);
      throw error;
    }
    if (typeof methodName !== 'string') {
      let error = new BusinessError(`Parameter error. The type of ${methodName} must be string`);
      throw error;
    }
    if (typeof isStatic !== 'boolean') {
      let error = new BusinessError(`Parameter error. The type of ${isStatic} must be boolean`);
      throw error;
    }
  }

  static addBefore(targetClass: Object, methodName: string, isStatic: boolean, before: Function): void {
    Aspect.checkParameters(targetClass, methodName, isStatic);
    if (typeof before !== 'function') {
      let error = new BusinessError(`Parameter error. The type of ${before} must be function`);
      throw error;
    }
    let obj = isStatic ? targetClass : Reflect.get(targetClass, 'prototype');
    if (!obj) {
      return;
    }
    let oldFunc = obj[methodName];
    if (!Aspect.checkMethodType(oldFunc, methodName)) {
      let newFunc = function(...args : AnyType[]): AnyType {
        before(this, ...args);
        let ret = oldFunc.bind(this)(...args);
        return ret;
      };
      obj[methodName] = newFunc;
    } else {
      let newFunc = async function (...args : AnyType[]): Promise<AnyType> {
        before(this, ...args);
        let ret = oldFunc.bind(this)(...args);
        return ret;
      };
      obj[methodName] = newFunc;
    }
  }

  static addAfter(targetClass: Object, methodName: string, isStatic: boolean, after: Function): void {
    Aspect.checkParameters(targetClass, methodName, isStatic);
    if (typeof after !== 'function') {
      let error = new BusinessError(`Parameter error. The type of ${after} should be function.`);
      throw error;
    }
    let obj = isStatic ? targetClass : Reflect.get(targetClass, 'prototype');
    if (!obj) {
      return;
    }
    let oldFunc = obj[methodName];
    if (!Aspect.checkMethodType(oldFunc, methodName)) {
      let newFunc = function(...args : AnyType[]): AnyType {
        let ret1 = oldFunc.bind(this)(...args);
        let ret2 = after(this, ret1, ...args);
        return ret2;
      };
      obj[methodName] = newFunc;
    } else {
      let newFunc = async function (...args : AnyType[]): Promise<AnyType> {
        let ret1 = oldFunc.bind(this)(...args);
        let ret2 = after(this, ret1, ...args);
        return ret2;
      };
      obj[methodName] = newFunc;
    }
  }

  static replace(targetClass: Object, methodName: string, isStatic: boolean, instead: Function) : void {
    Aspect.checkParameters(targetClass, methodName, isStatic);
    if (typeof instead !== 'function') {
      let error = new BusinessError(`Parameter error. The type of ${instead} should be function.`);
      throw error;
    }
    let obj = isStatic ? targetClass : Reflect.get(targetClass, 'prototype');
    if (!obj) {
      return;
    }
    let oldFunc = obj[methodName];
    if (!Aspect.checkMethodType(oldFunc, methodName)) {
      let func = function(...args : AnyType[]): AnyType {
        let ret = instead(this, ...args);
        return ret;
      };
      obj[methodName] = func;
    } else {
      let func = async function (...args : AnyType[]): Promise<AnyType> {
        let ret = instead(this, ...args);
        return ret;
      };
      obj[methodName] = func;
    }
  }
}

export default {
  printf: printf,
  format: format,
  getErrorString: getErrorString,
  errnoToString: errnoToString,
  callbackWrapper: callbackWrapper,
  promiseWrapper: promiseWrapper,
  promisify: promisify,
  randomUUID: randomUUID,
  randomBinaryUUID: randomBinaryUUID,
  generateRandomUUID: randomUUID,
  generateRandomBinaryUUID: randomBinaryUUID,
  parseUUID: parseUUID,
  getHash: getHash,
  TextEncoder: textEncoder,
  TextDecoder: TextDecoder,
  Base64: base64,
  Base64Helper: Base64Helper,
  types: types,
  LruBuffer: LruBuffer,
  LRUCache: LRUCache,
  RationalNumber: RationalNumber,
  Scope: Scope,
  ScopeHelper: ScopeHelper,
  Type: Type,
  Aspect: Aspect,
  StringDecoder: stringdecoder,
};