bc518174
 王天杨
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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.reduceCSSCalc = reduceCSSCalc;
exports.safeEvaluateExpression = safeEvaluateExpression;
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;
}
function safeEvaluateExpression(expression) {
try {
return evaluateExpression(expression);
} catch (e) {
/* istanbul ignore next */
return STR_NAN;
}
}
function reduceCSSCalc(expression) {
var result = safeEvaluateExpression(expression.slice(5, -1));
if (result === STR_NAN) {
// notify the user
return '';
}
return result;
}
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