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import { isNan } from './DataUtils';
const MULTIPLY_OR_DIVIDE_REGEX = /(-?\d+(?:\.\d+)?[a-zA-Z%]*)([*/])(-?\d+(?:\.\d+)?[a-zA-Z%]*)/;
const ADD_OR_SUBTRACT_REGEX = /(-?\d+(?:\.\d+)?[a-zA-Z%]*)([+-])(-?\d+(?:\.\d+)?[a-zA-Z%]*)/;
const CSS_LENGTH_UNIT_REGEX = /^px|cm|vh|vw|em|rem|%|mm|in|pt|pc|ex|ch|vmin|vmax|Q$/;
const NUM_SPLIT_REGEX = /(-?\d+(?:\.\d+)?)([a-zA-Z%]+)?/;
const CONVERSION_RATES: Record<string, number> = {
cm: 96 / 2.54,
mm: 96 / 25.4,
pt: 96 / 72,
pc: 96 / 6,
in: 96,
Q: 96 / (2.54 * 40),
px: 1,
};
const FIXED_CSS_LENGTH_UNITS: Array<keyof typeof CONVERSION_RATES> = Object.keys(CONVERSION_RATES);
const STR_NAN = 'NaN';
function convertToPx(value: number, unit: string): number {
return value * CONVERSION_RATES[unit];
}
class DecimalCSS {
static parse(str: string) {
const [, numStr, unit] = NUM_SPLIT_REGEX.exec(str) ?? [];
return new DecimalCSS(parseFloat(numStr), unit ?? '');
}
constructor(
public num: number,
public unit: string,
) {
this.num = num;
this.unit = unit;
if (isNan(num)) {
this.unit = '';
}
if (unit !== '' && !CSS_LENGTH_UNIT_REGEX.test(unit)) {
this.num = NaN;
this.unit = '';
}
if (FIXED_CSS_LENGTH_UNITS.includes(unit)) {
this.num = convertToPx(num, unit);
this.unit = 'px';
}
}
add(other: DecimalCSS) {
if (this.unit !== other.unit) {
return new DecimalCSS(NaN, '');
}
return new DecimalCSS(this.num + other.num, this.unit);
}
subtract(other: DecimalCSS) {
if (this.unit !== other.unit) {
return new DecimalCSS(NaN, '');
}
return new DecimalCSS(this.num - other.num, this.unit);
}
multiply(other: DecimalCSS) {
if (this.unit !== '' && other.unit !== '' && this.unit !== other.unit) {
return new DecimalCSS(NaN, '');
}
return new DecimalCSS(this.num * other.num, this.unit || other.unit);
}
divide(other: DecimalCSS) {
if (this.unit !== '' && other.unit !== '' && this.unit !== other.unit) {
return new DecimalCSS(NaN, '');
}
return new DecimalCSS(this.num / other.num, this.unit || other.unit);
}
toString() {
return `${this.num}${this.unit}`;
}
isNaN() {
return isNan(this.num);
}
}
function calculateArithmetic(expr: string): string {
if (expr.includes(STR_NAN)) {
return STR_NAN;
}
let newExpr = expr;
while (newExpr.includes('*') || newExpr.includes('/')) {
const [, leftOperand, operator, rightOperand] = MULTIPLY_OR_DIVIDE_REGEX.exec(newExpr) ?? [];
const lTs = DecimalCSS.parse(leftOperand ?? '');
const rTs = DecimalCSS.parse(rightOperand ?? '');
const 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)) {
const [, leftOperand, operator, rightOperand] = ADD_OR_SUBTRACT_REGEX.exec(newExpr) ?? [];
const lTs = DecimalCSS.parse(leftOperand ?? '');
const rTs = DecimalCSS.parse(rightOperand ?? '');
const 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;
}
const PARENTHESES_REGEX = /\(([^()]*)\)/;
function calculateParentheses(expr: string): string {
let newExpr = expr;
let match: ReturnType<typeof RegExp.prototype.exec> | null;
// eslint-disable-next-line no-cond-assign
while ((match = PARENTHESES_REGEX.exec(newExpr)) != null) {
const [, parentheticalExpression] = match;
newExpr = newExpr.replace(PARENTHESES_REGEX, calculateArithmetic(parentheticalExpression));
}
return newExpr;
}
function evaluateExpression(expression: string): string {
let newExpr = expression.replace(/\s+/g, '');
newExpr = calculateParentheses(newExpr);
newExpr = calculateArithmetic(newExpr);
return newExpr;
}
export function safeEvaluateExpression(expression: string): string {
try {
return evaluateExpression(expression);
} catch {
return STR_NAN;
}
}
export function reduceCSSCalc(expression: string): string {
const result = safeEvaluateExpression(expression.slice(5, -1));
if (result === STR_NAN) {
return '';
}
return result;
}
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