@phema/cql-execution/lib/datatypes/quantity.js

An execution framework for the Clinical Quality Language (CQL)

"use strict";

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(arr, i) { if (typeof Symbol === "undefined" || !(Symbol.iterator in Object(arr))) return; var _arr = []; var _n = true; var _d = false; var _e = undefined; try { for (var _i = arr[Symbol.iterator](), _s; !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }

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, descriptor.key, descriptor); } }

function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }

var _require = require('../util/math'),
    decimalAdjust = _require.decimalAdjust,
    isValidDecimal = _require.isValidDecimal,
    overflowsOrUnderflows = _require.overflowsOrUnderflows;

var _require2 = require('../util/units'),
    checkUnit = _require2.checkUnit,
    _convertUnit = _require2.convertUnit,
    normalizeUnitsWhenPossible = _require2.normalizeUnitsWhenPossible,
    convertToCQLDateUnit = _require2.convertToCQLDateUnit,
    getProductOfUnits = _require2.getProductOfUnits,
    getQuotientOfUnits = _require2.getQuotientOfUnits;

var Quantity = /*#__PURE__*/function () {
  function Quantity(value, unit) {
    _classCallCheck(this, Quantity);

    this.value = value;
    this.unit = unit;

    if (this.value == null || isNaN(this.value)) {
      throw new Error('Cannot create a quantity with an undefined value');
    } else if (!isValidDecimal(this.value)) {
      throw new Error('Cannot create a quantity with an invalid decimal value');
    } // Attempt to parse the unit with UCUM. If it fails, throw a friendly error.


    if (this.unit != null) {
      var validation = checkUnit(this.unit);

      if (!validation.valid) {
        throw new Error(validation.message);
      }
    }
  }

  _createClass(Quantity, [{
    key: "isQuantity",
    get: function get() {
      return true;
    }
  }, {
    key: "clone",
    value: function clone() {
      return new Quantity(this.value, this.unit);
    }
  }, {
    key: "toString",
    value: function toString() {
      return "".concat(this.value, " '").concat(this.unit, "'");
    }
  }, {
    key: "sameOrBefore",
    value: function sameOrBefore(other) {
      if (other != null && other.isQuantity) {
        var otherVal = _convertUnit(other.value, other.unit, this.unit);

        if (otherVal == null) {
          return null;
        } else {
          return this.value <= otherVal;
        }
      }
    }
  }, {
    key: "sameOrAfter",
    value: function sameOrAfter(other) {
      if (other != null && other.isQuantity) {
        var otherVal = _convertUnit(other.value, other.unit, this.unit);

        if (otherVal == null) {
          return null;
        } else {
          return this.value >= otherVal;
        }
      }
    }
  }, {
    key: "after",
    value: function after(other) {
      if (other != null && other.isQuantity) {
        var otherVal = _convertUnit(other.value, other.unit, this.unit);

        if (otherVal == null) {
          return null;
        } else {
          return this.value > otherVal;
        }
      }
    }
  }, {
    key: "before",
    value: function before(other) {
      if (other != null && other.isQuantity) {
        var otherVal = _convertUnit(other.value, other.unit, this.unit);

        if (otherVal == null) {
          return null;
        } else {
          return this.value < otherVal;
        }
      }
    }
  }, {
    key: "equals",
    value: function equals(other) {
      if (other != null && other.isQuantity) {
        if (!this.unit && other.unit || this.unit && !other.unit) {
          return false;
        } else if (!this.unit && !other.unit) {
          return this.value === other.value;
        } else {
          var otherVal = _convertUnit(other.value, other.unit, this.unit);

          if (otherVal == null) {
            return null;
          } else {
            return decimalAdjust('round', this.value, -8) === otherVal;
          }
        }
      }
    }
  }, {
    key: "convertUnit",
    value: function convertUnit(toUnit) {
      var value = _convertUnit(this.value, this.unit, toUnit); // Need to pass through constructor again to catch invalid units


      return new Quantity(value, toUnit);
    }
  }, {
    key: "dividedBy",
    value: function dividedBy(other) {
      if (other == null || other === 0 || other.value === 0) {
        return null;
      } else if (!other.isQuantity) {
        // convert it to a quantity w/ unit 1
        other = new Quantity(other, '1');
      }

      var _normalizeUnitsWhenPo = normalizeUnitsWhenPossible(this.value, this.unit, other.value, other.unit),
          _normalizeUnitsWhenPo2 = _slicedToArray(_normalizeUnitsWhenPo, 4),
          val1 = _normalizeUnitsWhenPo2[0],
          unit1 = _normalizeUnitsWhenPo2[1],
          val2 = _normalizeUnitsWhenPo2[2],
          unit2 = _normalizeUnitsWhenPo2[3];

      var resultValue = val1 / val2;
      var resultUnit = getQuotientOfUnits(unit1, unit2); // Check for invalid unit or value

      if (resultUnit == null || overflowsOrUnderflows(resultValue)) {
        return null;
      }

      return new Quantity(decimalAdjust('round', resultValue, -8), resultUnit);
    }
  }, {
    key: "multiplyBy",
    value: function multiplyBy(other) {
      if (other == null) {
        return null;
      } else if (!other.isQuantity) {
        // convert it to a quantity w/ unit 1
        other = new Quantity(other, '1');
      }

      var _normalizeUnitsWhenPo3 = normalizeUnitsWhenPossible(this.value, this.unit, other.value, other.unit),
          _normalizeUnitsWhenPo4 = _slicedToArray(_normalizeUnitsWhenPo3, 4),
          val1 = _normalizeUnitsWhenPo4[0],
          unit1 = _normalizeUnitsWhenPo4[1],
          val2 = _normalizeUnitsWhenPo4[2],
          unit2 = _normalizeUnitsWhenPo4[3];

      var resultValue = val1 * val2;
      var resultUnit = getProductOfUnits(unit1, unit2); // Check for invalid unit or value

      if (resultUnit == null || overflowsOrUnderflows(resultValue)) {
        return null;
      }

      return new Quantity(decimalAdjust('round', resultValue, -8), resultUnit);
    }
  }]);

  return Quantity;
}();

function parseQuantity(str) {
  var components = /([+|-]?\d+\.?\d*)\s*('(.+)')?/.exec(str);

  if (components != null && components[1] != null) {
    var value = parseFloat(components[1]);

    if (!isValidDecimal(value)) {
      return null;
    }

    var unit;

    if (components[3] != null) {
      unit = components[3].trim();
    } else {
      unit = '';
    }

    return new Quantity(value, unit);
  } else {
    return null;
  }
}

function doScaledAddition(a, b, scaleForB) {
  if (a != null && a.isQuantity && b != null && b.isQuantity) {
    var _normalizeUnitsWhenPo5 = normalizeUnitsWhenPossible(a.value, a.unit, b.value * scaleForB, b.unit),
        _normalizeUnitsWhenPo6 = _slicedToArray(_normalizeUnitsWhenPo5, 4),
        val1 = _normalizeUnitsWhenPo6[0],
        unit1 = _normalizeUnitsWhenPo6[1],
        val2 = _normalizeUnitsWhenPo6[2],
        unit2 = _normalizeUnitsWhenPo6[3];

    if (unit1 !== unit2) {
      // not compatible units, so we can't do addition
      return null;
    }

    var sum = val1 + val2;

    if (overflowsOrUnderflows(sum)) {
      return null;
    }

    return new Quantity(sum, unit1);
  } else if (a.copy && a.add) {
    // Date / DateTime require a CQL time unit
    var cqlUnitB = convertToCQLDateUnit(b.unit) || b.unit;
    return a.copy().add(b.value * scaleForB, cqlUnitB);
  } else {
    throw new Error('Unsupported argument types.');
  }
}

function doAddition(a, b) {
  return doScaledAddition(a, b, 1);
}

function doSubtraction(a, b) {
  return doScaledAddition(a, b, -1);
}

function doDivision(a, b) {
  if (a != null && a.isQuantity) {
    return a.dividedBy(b);
  }
}

function doMultiplication(a, b) {
  if (a != null && a.isQuantity) {
    return a.multiplyBy(b);
  } else {
    return b.multiplyBy(a);
  }
}

module.exports = {
  Quantity: Quantity,
  parseQuantity: parseQuantity,
  doAddition: doAddition,
  doSubtraction: doSubtraction,
  doDivision: doDivision,
  doMultiplication: doMultiplication
};