@orca-fe/tools/es/convertUnit.js

front-end tools

function _createForOfIteratorHelper(o, allowArrayLike) { var it = typeof Symbol !== "undefined" && o[Symbol.iterator] || o["@@iterator"]; if (!it) { if (Array.isArray(o) || (it = _unsupportedIterableToArray(o)) || allowArrayLike && o && typeof o.length === "number") { if (it) o = it; var i = 0; var F = function F() {}; return { s: F, n: function n() { if (i >= o.length) return { done: true }; return { done: false, value: o[i++] }; }, e: function e(_e) { throw _e; }, f: F }; } throw new TypeError("Invalid attempt to iterate non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); } var normalCompletion = true, didErr = false, err; return { s: function s() { it = it.call(o); }, n: function n() { var step = it.next(); normalCompletion = step.done; return step; }, e: function e(_e2) { didErr = true; err = _e2; }, f: function f() { try { if (!normalCompletion && it.return != null) it.return(); } finally { if (didErr) throw err; } } }; }
function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }
function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) arr2[i] = arr[i]; return arr2; }
function _defineProperty(obj, key, value) { key = _toPropertyKey(key); if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
function _toPropertyKey(arg) { var key = _toPrimitive(arg, "string"); return typeof key === "symbol" ? key : String(key); }
function _toPrimitive(input, hint) { if (typeof input !== "object" || input === null) return input; var prim = input[Symbol.toPrimitive]; if (prim !== undefined) { var res = prim.call(input, hint || "default"); if (typeof res !== "object") return res; throw new TypeError("@@toPrimitive must return a primitive value."); } return (hint === "string" ? String : Number)(input); }
export class UnitValue {
  constructor() {
    _defineProperty(this, "unit", '');
    _defineProperty(this, "strValue", '0');
    _defineProperty(this, "value", 0);
    _defineProperty(this, "originValue", 0);
  }
  toString() {
    return this.strValue + this.unit;
  }
}

/**
 * 带单位的数字
 * @param value 数字值
 * @param unit 单位
 * @param times 倍数
 */
export function createUnitValue(value, unit, originValue) {
  var uv = new UnitValue();
  uv.value = Number(value) || 0;
  uv.strValue = String(value);
  uv.unit = unit || '';
  uv.originValue = originValue !== null && originValue !== void 0 ? originValue : uv.value;
  return uv;
}
/**
 * 根据精度，计算出 num 需要保留的小数位数
 * @param num 数本身
 * @param precision 精度
 */
function getDecimalLengthByPrecision(num, precision) {
  var numStr = String(num);
  var dotIndex = numStr.indexOf('.');
  if (dotIndex < 0) {
    return 0;
  }
  // 计算得出小数的长度
  var decimalLength = numStr.length - 1 - dotIndex;
  if (precision === undefined) {
    return decimalLength;
  }

  // 在给出了精度的情况下，计算出整数部分的位数
  var intLength = Math.floor(Math.log10(num));

  // 计算得出剩余给小数部分的精度
  var p = precision - Math.min(Math.max(0, intLength), precision);
  // 剩余精度不能超过小数位数
  return Math.min(decimalLength, p);
}

/**
 * 根据转换规则，构造一个单位转换函数
 * @param rules 规则
 * @param options 其他配置
 */
export function createCovertUnitFn(rules, options = {}) {
  var _options$precisionMod = options.precisionMode,
    precisionMode = _options$precisionMod === void 0 ? 'auto' : _options$precisionMod;
  return (value, defaultPrecision, defaultUnit = '') => {
    var num = Number(value);
    var lastUnit = defaultUnit;
    var lastPrecision = defaultPrecision;
    var _iterator = _createForOfIteratorHelper(rules),
      _step;
    try {
      for (_iterator.s(); !(_step = _iterator.n()).done;) {
        var rule = _step.value;
        var divisor = rule.divisor,
          _rule$minValue = rule.minValue,
          minValue = _rule$minValue === void 0 ? divisor : _rule$minValue,
          unit = rule.unit,
          _rule$precision = rule.precision,
          precision = _rule$precision === void 0 ? 2 : _rule$precision;
        if (num < minValue) {
          break;
        }
        lastPrecision = precision;
        num /= divisor;
        lastUnit = unit;
      }
    } catch (err) {
      _iterator.e(err);
    } finally {
      _iterator.f();
    }
    var fixed = getDecimalLengthByPrecision(num, lastPrecision);
    return createUnitValue(num.toFixed(precisionMode === 'auto' ? fixed : lastPrecision), lastUnit, Number(value));
  };
}
export var chineseUnit = createCovertUnitFn([{
  divisor: 10000,
  unit: '万'
}, {
  divisor: 10000,
  unit: '亿'
}, {
  divisor: 10000,
  unit: '万亿'
}]);
export var byteUnit = createCovertUnitFn([{
  divisor: 1024,
  unit: 'K',
  minValue: 1000
}, {
  divisor: 1024,
  unit: 'M',
  minValue: 1000
}, {
  divisor: 1024,
  unit: 'G',
  minValue: 1000
}, {
  divisor: 1024,
  unit: 'T',
  minValue: 1000
}, {
  divisor: 1024,
  unit: 'P',
  minValue: 1000
}, {
  divisor: 1024,
  unit: 'E',
  minValue: 1000
}, {
  divisor: 1024,
  unit: 'Z',
  minValue: 1000
}, {
  divisor: 1024,
  unit: 'Y',
  minValue: 1000
}, {
  divisor: 1024,
  unit: 'B',
  minValue: 1000
}, {
  divisor: 1024,
  unit: 'N',
  minValue: 1000
}, {
  divisor: 1024,
  unit: 'D',
  minValue: 1000
}, {
  divisor: 1024,
  unit: 'C',
  minValue: 1000
}, {
  divisor: 1024,
  unit: 'X',
  minValue: 1000
}]);