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main
api/server/utils/math.js
47 строк
2 KB
Danny Avila
refactor(api): Central Logging 📜 (#1348)
14 дек 2023, 15:49
Не верифицирован
14 дек 2023, 15:49
ea1dd59
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/** * Evaluates a mathematical expression provided as a string and returns the result. * * If the input is already a number, it returns the number as is. * If the input is not a string or contains invalid characters, an error is thrown. * If the evaluated result is not a number, an error is thrown. * * @param {string|number} str - The mathematical expression to evaluate, or a number. * @param {number} [fallbackValue] - The default value to return if the input is not a string or number, or if the evaluated result is not a number. * * @returns {number} The result of the evaluated expression or the input number. * * @throws {Error} Throws an error if the input is not a string or number, contains invalid characters, or does not evaluate to a number. */ function math(str, fallbackValue) { const fallback = typeof fallbackValue !== 'undefined' && typeof fallbackValue === 'number'; if (typeof str !== 'string' && typeof str === 'number') { return str; } else if (typeof str !== 'string') { if (fallback) { return fallbackValue; } throw new Error(`str is ${typeof str}, but should be a string`); } const validStr = /^[+\-\d.\s*/%()]+$/.test(str); if (!validStr) { if (fallback) { return fallbackValue; } throw new Error('Invalid characters in string'); } const value = eval(str); if (typeof value !== 'number') { if (fallback) { return fallbackValue; } throw new Error(`[math] str did not evaluate to a number but to a ${typeof value}`); } return value; } module.exports = math;