javascript_practice/calc-gui.js_bak at master · beaver84/javascript_practice · GitHub

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//JS calculator
//by ktbae
//2020.04.29

// input object
// 입력을 담당하는 object
var input= {
    'array': []
};

input.getInput = function() {
    return this.array.join("");
}

input.removeAll = function(str){
    this.array = [];
};

input.empty = function() {
    return this.array.length === 0;
};

input.getValue = function() {
    var str = this.array.shift();
    var n = Number(str);
    return n;
};

input.getOperator = function(){
    var op = this.array.shift();
    if (op === "+" || op === "-" || op === "*" || op === "/") {
        return op;
    } else {
        return "$";
    }
};

// output object
// 출력을 담당한다.
var output = {};
output.text = document.getElementById('output');

//calculator 객체
//계산을 담당
var calculator = {};
calculator.calculate = function(first, second, op){
    var ret;
    switch(op){
        case "+":
        ret = first + second;
        break;
        case "-":
        ret = first - second;
        case "*":
        ret = first * second;
        break;
        case "/":
        ret = first / second;
        break;
        default:
        return NaN;
    }
    return ret;
}

var clickNumbers = function(event){
    var str = event.target.innerHTML;
    console.log(str);

    switch (str) {
        case 'BS':
        input.array.pop();
        break;
        case '+':
        case '-':
        case '*':
        case '/':
        input.array.push(' ' + str + ' ');
        break;
        default:
        input.array.push(str);
    }
    // console.log(input.getInput());

    if (input.array.length === 0){
        output.text.innerHTML = input.getInput();
    } else {
        output.text.innerHTML = input.getInput();
    }
}

var showResult = function(event){
    var result = input.getValue();
    while (!input.empty()){
        var op = input.getOperator();
        var second = input.getValue();
        result = calculator.calculate(result, second, op);
    }
    output.print(result);
}
// var = input = {};

// input.init = function(str) {
//     this.list = str.split(" ");
// };

// input.empty = function(){
//     return this.list.length == 0;
// };

// input.getValue = function() {
//     var str = this.list.shift();
//     var n = Number(str);
//     return n;
// };

// input.getOperator = function(){
//     var op = this.list.shift();
//     if (op === "+" || op === "-" || op === "*" || op === "/"){
//         return op;
//     } else {
//         return "$";
//     }
// };