function _typeof(o) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (o) { return typeof o; } : function (o) { return o && "function" == typeof Symbol && o.constructor === Symbol && o !== Symbol.prototype ? "symbol" : typeof o; }, _typeof(o); }
function _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }
function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }
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 _iterableToArrayLimit(r, l) { var t = null == r ? null : "undefined" != typeof Symbol && r[Symbol.iterator] || r["@@iterator"]; if (null != t) { var e, n, i, u, a = [], f = !0, o = !1; try { if (i = (t = t.call(r)).next, 0 === l) { if (Object(t) !== t) return; f = !1; } else for (; !(f = (e = i.call(t)).done) && (a.push(e.value), a.length !== l); f = !0); } catch (r) { o = !0, n = r; } finally { try { if (!f && null != t["return"] && (u = t["return"](), Object(u) !== u)) return; } finally { if (o) throw n; } } return a; } }
function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }
function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, _toPropertyKey(descriptor.key), descriptor); } }
function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); Object.defineProperty(Constructor, "prototype", { writable: false }); return Constructor; }
function _toPropertyKey(t) { var i = _toPrimitive(t, "string"); return "symbol" == _typeof(i) ? i : i + ""; }
function _toPrimitive(t, r) { if ("object" != _typeof(t) || !t) return t; var e = t[Symbol.toPrimitive]; if (void 0 !== e) { var i = e.call(t, r || "default"); if ("object" != _typeof(i)) return i; throw new TypeError("@@toPrimitive must return a primitive value."); } return ("string" === r ? String : Number)(t); }
var MULTIPLY_OR_DIVIDE_REGEX = /(-?\d+(?:\.\d+)?[a-zA-Z%]*)([*/])(-?\d+(?:\.\d+)?[a-zA-Z%]*)/;
var ADD_OR_SUBTRACT_REGEX = /(-?\d+(?:\.\d+)?[a-zA-Z%]*)([+-])(-?\d+(?:\.\d+)?[a-zA-Z%]*)/;
var CSS_LENGTH_UNIT_REGEX = /^px|cm|vh|vw|em|rem|%|mm|in|pt|pc|ex|ch|vmin|vmax|Q$/;
var NUM_SPLIT_REGEX = /(-?\d+(?:\.\d+)?)([a-zA-Z%]+)?/;
var CONVERSION_RATES = {
  cm: 96 / 2.54,
  mm: 96 / 25.4,
  pt: 96 / 72,
  pc: 96 / 6,
  "in": 96,
  Q: 96 / (2.54 * 40),
  px: 1
};
var FIXED_CSS_LENGTH_UNITS = Object.keys(CONVERSION_RATES);
var STR_NAN = 'NaN';
function convertToPx(value, unit) {
  return value * CONVERSION_RATES[unit];
}
var DecimalCSS = /*#__PURE__*/function () {
  function DecimalCSS(num, unit) {
    _classCallCheck(this, DecimalCSS);
    this.num = num;
    this.unit = unit;
    this.num = num;
    this.unit = unit;
    if (Number.isNaN(num)) {
      this.unit = '';
    }
    if (unit !== '' && !CSS_LENGTH_UNIT_REGEX.test(unit)) {
      this.num = NaN;
      this.unit = '';
    }
    if (FIXED_CSS_LENGTH_UNITS.includes(unit)) {
      this.num = convertToPx(num, unit);
      this.unit = 'px';
    }
  }
  return _createClass(DecimalCSS, [{
    key: "add",
    value: function add(other) {
      if (this.unit !== other.unit) {
        return new DecimalCSS(NaN, '');
      }
      return new DecimalCSS(this.num + other.num, this.unit);
    }
  }, {
    key: "subtract",
    value: function subtract(other) {
      if (this.unit !== other.unit) {
        return new DecimalCSS(NaN, '');
      }
      return new DecimalCSS(this.num - other.num, this.unit);
    }
  }, {
    key: "multiply",
    value: function multiply(other) {
      if (this.unit !== '' && other.unit !== '' && this.unit !== other.unit) {
        return new DecimalCSS(NaN, '');
      }
      return new DecimalCSS(this.num * other.num, this.unit || other.unit);
    }
  }, {
    key: "divide",
    value: function divide(other) {
      if (this.unit !== '' && other.unit !== '' && this.unit !== other.unit) {
        return new DecimalCSS(NaN, '');
      }
      return new DecimalCSS(this.num / other.num, this.unit || other.unit);
    }
  }, {
    key: "toString",
    value: function toString() {
      return "".concat(this.num).concat(this.unit);
    }
  }, {
    key: "isNaN",
    value: function isNaN() {
      return Number.isNaN(this.num);
    }
  }], [{
    key: "parse",
    value: function parse(str) {
      var _NUM_SPLIT_REGEX$exec;
      var _ref = (_NUM_SPLIT_REGEX$exec = NUM_SPLIT_REGEX.exec(str)) !== null && _NUM_SPLIT_REGEX$exec !== void 0 ? _NUM_SPLIT_REGEX$exec : [],
        _ref2 = _slicedToArray(_ref, 3),
        numStr = _ref2[1],
        unit = _ref2[2];
      return new DecimalCSS(parseFloat(numStr), unit !== null && unit !== void 0 ? unit : '');
    }
  }]);
}();
function calculateArithmetic(expr) {
  if (expr.includes(STR_NAN)) {
    return STR_NAN;
  }
  var newExpr = expr;
  while (newExpr.includes('*') || newExpr.includes('/')) {
    var _MULTIPLY_OR_DIVIDE_R;
    var _ref3 = (_MULTIPLY_OR_DIVIDE_R = MULTIPLY_OR_DIVIDE_REGEX.exec(newExpr)) !== null && _MULTIPLY_OR_DIVIDE_R !== void 0 ? _MULTIPLY_OR_DIVIDE_R : [],
      _ref4 = _slicedToArray(_ref3, 4),
      leftOperand = _ref4[1],
      operator = _ref4[2],
      rightOperand = _ref4[3];
    var lTs = DecimalCSS.parse(leftOperand !== null && leftOperand !== void 0 ? leftOperand : '');
    var rTs = DecimalCSS.parse(rightOperand !== null && rightOperand !== void 0 ? rightOperand : '');
    var result = operator === '*' ? lTs.multiply(rTs) : lTs.divide(rTs);
    if (result.isNaN()) {
      return STR_NAN;
    }
    newExpr = newExpr.replace(MULTIPLY_OR_DIVIDE_REGEX, result.toString());
  }
  while (newExpr.includes('+') || /.-\d+(?:\.\d+)?/.test(newExpr)) {
    var _ADD_OR_SUBTRACT_REGE;
    var _ref5 = (_ADD_OR_SUBTRACT_REGE = ADD_OR_SUBTRACT_REGEX.exec(newExpr)) !== null && _ADD_OR_SUBTRACT_REGE !== void 0 ? _ADD_OR_SUBTRACT_REGE : [],
      _ref6 = _slicedToArray(_ref5, 4),
      _leftOperand = _ref6[1],
      _operator = _ref6[2],
      _rightOperand = _ref6[3];
    var _lTs = DecimalCSS.parse(_leftOperand !== null && _leftOperand !== void 0 ? _leftOperand : '');
    var _rTs = DecimalCSS.parse(_rightOperand !== null && _rightOperand !== void 0 ? _rightOperand : '');
    var _result = _operator === '+' ? _lTs.add(_rTs) : _lTs.subtract(_rTs);
    if (_result.isNaN()) {
      return STR_NAN;
    }
    newExpr = newExpr.replace(ADD_OR_SUBTRACT_REGEX, _result.toString());
  }
  return newExpr;
}
var PARENTHESES_REGEX = /\(([^()]*)\)/;
function calculateParentheses(expr) {
  var newExpr = expr;
  while (newExpr.includes('(')) {
    var _PARENTHESES_REGEX$ex = PARENTHESES_REGEX.exec(newExpr),
      _PARENTHESES_REGEX$ex2 = _slicedToArray(_PARENTHESES_REGEX$ex, 2),
      parentheticalExpression = _PARENTHESES_REGEX$ex2[1];
    newExpr = newExpr.replace(PARENTHESES_REGEX, calculateArithmetic(parentheticalExpression));
  }
  return newExpr;
}
function evaluateExpression(expression) {
  var newExpr = expression.replace(/\s+/g, '');
  newExpr = calculateParentheses(newExpr);
  newExpr = calculateArithmetic(newExpr);
  return newExpr;
}
export function safeEvaluateExpression(expression) {
  try {
    return evaluateExpression(expression);
  } catch (e) {
    /* istanbul ignore next */
    return STR_NAN;
  }
}
export function reduceCSSCalc(expression) {
  var result = safeEvaluateExpression(expression.slice(5, -1));
  if (result === STR_NAN) {
    // notify the user
    return '';
  }
  return result;
}