jison-calculator/src/app.test.js

const calculator = require('./calculator.js');
const tests = require('./test_cases.js');
const {handlePrecision} = require('./utils.js');

const parser = new calculator.Parser();

function calc(exp, isDeg = false) {
    exp = exp.replace(/E/g, 'e');
    exp = exp.replace(/\be\b/g, 'Math.E');

    parser.parse(`isDeg(${isDeg * 1})`);

    const stack = [];
    let res = [];
    for (let i = 0; i < exp.length; i++) {
        const val = exp[i];
        if (val !== ')') {
            stack.push(val);
        } else {
            let v = stack.pop();
            while (v !== '(') {
                res.unshift(v);
                v = stack.pop();
            }
            stack.push(' ');
            const resNum = res.join('');
            if (res.length === 1 || !isNaN(resNum)) {
                stack.push(resNum);
            } else {
                stack.push(parser.parse(resNum) + '');
            }
            res = [];
        }
    }

    return handlePrecision(parser.parse(stack.join('')));
}

tests.forEach(v => {
    test(`isDeg=${v.isDeg ? 1: 0} ${v.value} = ${v.result}`, () => {
        expect(calc(v.value, v.isDeg)).toBe(String(v.result));
    });
});