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DemomakerDemomaker
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‎.gitignore

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‎CalculatorModel.js

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const DEFAULT_START_VALUE = 0;
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class CalculatorModel
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{
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static Numbers = [];
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static Operators = [];
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static MostRecentNumber = DEFAULT_START_VALUE;
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static MostRecentOperator = "";
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static MostRecentResult = DEFAULT_START_VALUE;
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static CalculateResult()
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{
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return this.Calculate(this.Numbers, this.Operators);
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}
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static Calculate(numbers, operators)
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{
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var tempNumbers = numbers.slice();
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var currentValue = tempNumbers[0];
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var currentOperator = "";
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tempNumbers.shift();
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for(var i = 0; i < operators.length && tempNumbers.length > 0; i++)
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{
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currentOperator = operators[i];
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switch(ElementEvaluator.EvaluateValue(currentOperator))
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{
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case ElementEnum.PLUS:
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currentValue += tempNumbers[0];
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break;
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case ElementEnum.MINUS:
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currentValue -= tempNumbers[0];
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break;
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case ElementEnum.MULTIPLICATION:
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currentValue *= tempNumbers[0];
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break;
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case ElementEnum.DIVISION:
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currentValue /= tempNumbers[0];
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break;
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default:
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currentValue = DEFAULT_START_VALUE;
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break;
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}
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tempNumbers.shift();
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}
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return currentValue;
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}
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static AddOperatorToCalculation(tempOperator)
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{
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this.Operators.push(tempOperator);
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this.MostRecentOperator = tempOperator;
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}
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static AddNumberToCalculation(number)
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{
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this.Numbers.push(number);
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this.MostRecentNumber = number;
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}
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static GetResult()
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{
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var result = 0;
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if (this.Numbers.length > this.Operators.length && this.Numbers.length > 1 && this.Operators.length > 0)
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result = this.CalculateResult();
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else
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result = DEFAULT_START_VALUE;
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this.MostRecentResult = result;
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return result;
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}
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static Clear()
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{
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this.Numbers = [];
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this.Operators = [];
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}
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static GetAmountOfNumbers()
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{
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return this.Numbers.length;
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}
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static GetAmountOfOperators()
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{
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return this.Operators.length;
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}
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}

‎Element.js

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const ZERO_VALUE = "0";
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const ONE_VALUE = "1";
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const TWO_VALUE = "2";
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const THREE_VALUE = "3";
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const FOUR_VALUE = "4";
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const FIVE_VALUE = "5";
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const SIX_VALUE = "6";
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const SEVEN_VALUE = "7";
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const EIGHT_VALUE = "8";
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const NINE_VALUE = "9";
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const DECIMAL_VALUE = ".";
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const SIGN_CHANGE_VALUE = "+/-";
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const PLUS_VALUE = "+";
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const MINUS_VALUE = "-";
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const MULTIPLICATION_VALUE = "*";
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const DIVISION_VALUE = "/";
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const DEFAULT_VALUE = "";
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const ElementEnum =
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{
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NONE: 0,
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ZERO: 1,
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ONE: 2,
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TWO: 3,
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THREE: 4,
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FOUR: 5,
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FIVE: 6,
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SIX: 7,
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SEVEN: 8,
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EIGHT: 9,
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NINE: 10,
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SIGN_CHANGE: 11,
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DECIMAL: 12,
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PLUS: 13,
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MINUS: 14,
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MULTIPLICATION: 15,
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DIVISION: 16
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}
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Object.freeze(ElementEnum);
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class ElementEvaluator
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{
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static EvaluateElement(element)
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{
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switch(element)
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{
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case ElementEnum.ZERO:
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return ZERO_VALUE;
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case ElementEnum.ONE:
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return ONE_VALUE;
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case ElementEnum.TWO:
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return TWO_VALUE;
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case ElementEnum.THREE:
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return THREE_VALUE;
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case ElementEnum.FOUR:
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return FOUR_VALUE;
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case ElementEnum.FIVE:
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return FIVE_VALUE;
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case ElementEnum.SIX:
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return SIX_VALUE;
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case ElementEnum.SEVEN:
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return SEVEN_VALUE;
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case ElementEnum.EIGHT:
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return EIGHT_VALUE;
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case ElementEnum.NINE:
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return NINE_VALUE;
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case ElementEnum.DECIMAL:
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return DECIMAL_VALUE;
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case ElementEnum.SIGN_CHANGE:
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return SIGN_CHANGE_VALUE;
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case ElementEnum.PLUS:
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return PLUS_VALUE;
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case ElementEnum.MINUS:
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return MINUS_VALUE;
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case ElementEnum.MULTIPLICATION:
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return MULTIPLICATION_VALUE;
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case ElementEnum.DIVISION:
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return DIVISION_VALUE;
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case ElementEnum.NONE:
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return DEFAULT_VALUE;
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default:
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return DEFAULT_VALUE;
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}
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}
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static EvaluateValue(value)
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{
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switch (value)
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{
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case ZERO_VALUE:
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return ElementEnum.ZERO;
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case ONE_VALUE:
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return ElementEnum.ONE;
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case TWO_VALUE:
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return ElementEnum.TWO;
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case THREE_VALUE:
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return ElementEnum.THREE;
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case FOUR_VALUE:
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return ElementEnum.FOUR;
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case FIVE_VALUE:
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return ElementEnum.FIVE;
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case SIX_VALUE:
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return ElementEnum.SIX;
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case SEVEN_VALUE:
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return ElementEnum.SEVEN;
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case EIGHT_VALUE:
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return ElementEnum.EIGHT;
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case NINE_VALUE:
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return ElementEnum.NINE;
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case DECIMAL_VALUE:
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return ElementEnum.DECIMAL;
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case SIGN_CHANGE_VALUE:
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return ElementEnum.SIGN_CHANGE;
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case PLUS_VALUE:
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return ElementEnum.PLUS;
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case MINUS_VALUE:
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return ElementEnum.MINUS;
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case MULTIPLICATION_VALUE:
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return ElementEnum.MULTIPLICATION;
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case DIVISION_VALUE:
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return ElementEnum.DIVISION;
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default:
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return ElementEnum.NONE;
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}
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}
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static ElementIsNumber(element)
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{
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return this.ValueIsNumber(EvaluateElement(element));
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}
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static ValueIsNumber(value)
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{
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return !isNaN(value);
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}
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static ElementIsOperator(element)
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{
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return this.ValueIsOperator(EvaluateElement(element));
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}
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static ValueIsOperator(value)
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{
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return !this.ValueIsNumber(value) && value !== DECIMAL_VALUE && value !== SIGN_CHANGE_VALUE;
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}
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}

‎NumberBuilder.js

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const DEFAULT_FLOAT_VALUE = 0;
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const DEFAULT_STRING_VALUE = "";
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class NumberBuilder
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{
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static NumberAsString = DEFAULT_STRING_VALUE;
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static NewNumber()
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{
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this.NumberAsString = DEFAULT_STRING_VALUE;
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}
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static GetNumberFromString()
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{
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var conversionPossible = ElementEvaluator.ValueIsNumber(this.NumberAsString);
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if (conversionPossible) return parseFloat(this.NumberAsString);
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var numberWithoutDecimal = this.NumberAsString.slice(0,this.NumberAsString.indexOf(ElementEvaluator.EvaluateElement(ElementEnum.DECIMAL)));
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conversionPossible = ElementEvaluator.ValueIsNumber(numberWithoutDecimal);
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if (conversionPossible) return parseFloat(numberWithoutDecimal);
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return DEFAULT_FLOAT_VALUE;
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}
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static Append(addedCharacters)
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{
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if (ElementEvaluator.ValueIsOperator(addedCharacters)) return;
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if (ElementEvaluator.EvaluateValue(addedCharacters) == ElementEnum.DECIMAL && this.NumberAsString.includes(ElementEvaluator.EvaluateElement(ElementEnum.DECIMAL)))
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return;
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var multiplication = 1;
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var tempAddedCharacters = addedCharacters;
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for(var i = 0; i < tempAddedCharacters.length; i++)
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{
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if(tempAddedCharacters.includes(ElementEvaluator.EvaluateElement(ElementEnum.SIGN_CHANGE)))
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{
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multiplication *= -1;
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var foundIndex = tempAddedCharacters.indexOf(ElementEvaluator.EvaluateElement(ElementEnum.SIGN_CHANGE));
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var foundLength = ElementEvaluator.EvaluateElement(ElementEnum.SIGN_CHANGE).length;
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tempAddedCharacters = tempAddedCharacters.slice(0,foundIndex);
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}
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}
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this.NumberAsString += tempAddedCharacters;
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var temp = this.NumberAsString;
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this.NumberAsString = (multiplication * this.GetNumberFromString()).toString();
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if (temp !== this.NumberAsString)
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{
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if (this.NumberAsString.includes("-"))
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{
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var signChanged = "-" + temp;
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if (signChanged !== this.NumberAsString)
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this.NumberAsString += ".";
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}
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else if (temp.includes("-"))
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{
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var tempNumberAsString = "-" + this.NumberAsString;
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if (temp !== tempNumberAsString)
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this.NumberAsString += ".";
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}
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else
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{
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this.NumberAsString += ".";
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}
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}
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}
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static BuildNumber()
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{
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return this.GetNumberFromString();
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}
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}

‎index.html

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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="UTF-8">
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<title>Calculator</title>
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<!-- https://electronjs.org/docs/tutorial/security#csp-meta-tag -->
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<meta http-equiv="Content-Security-Policy" content="script-src 'self' 'unsafe-inline';" />
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<link rel="stylesheet" href="styles.css">
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</head>
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<body>
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<p id="Result" class="resultSize resultFont resultMargin resultBackgroundColor resultAlignment defaultPosition resultBorder resultOverflow">0</p>
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<button id="SignChangeButton" class="defaultSize signChangeFont signChangeButtonMargin defaultAlignment defaultPosition">+/-</button>
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<button id="DecimalButton" class="defaultSize defaultFont decimalButtonMargin defaultAlignment defaultPosition">,</button>
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<button id="ZeroButton" class="defaultSize defaultFont zeroButtonMargin defaultAlignment defaultPosition">0</button>
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<button id="OneButton" class="defaultSize defaultFont oneButtonMargin defaultAlignment defaultPosition">1</button>
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<button id="TwoButton" class="defaultSize defaultFont twoButtonMargin defaultAlignment defaultPosition">2</button>
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<button id="ThreeButton" class="defaultSize defaultFont threeButtonMargin defaultAlignment defaultPosition">3</button>
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<button id="FourButton" class="defaultSize defaultFont fourButtonMargin defaultAlignment defaultPosition">4</button>
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<button id="FiveButton" class="defaultSize defaultFont fiveButtonMargin defaultAlignment defaultPosition">5</button>
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<button id="SixButton" class="defaultSize defaultFont sixButtonMargin defaultAlignment defaultPosition">6</button>
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<button id="SevenButton" class="defaultSize defaultFont sevenButtonMargin defaultAlignment defaultPosition">7</button>
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<button id="EightButton" class="defaultSize defaultFont eightButtonMargin defaultAlignment defaultPosition">8</button>
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<button id="NineButton" class="defaultSize defaultFont nineButtonMargin defaultAlignment defaultPosition">9</button>
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<button id="MinusButton" class="defaultSize defaultFont minusButtonMargin defaultAlignment defaultPosition">-</button>
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<button id="PlusButton" class="defaultSize defaultFont plusButtonMargin defaultAlignment defaultPosition">+</button>
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<button id="DivisionButton" class="defaultSize defaultFont divisionButtonMargin defaultAlignment defaultPosition">/</button>
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<button id="MultiplicationButton" class="defaultSize defaultFont multiplicationButtonMargin defaultAlignment defaultPosition">*</button>
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<button id="ClearButton" class="defaultSize signChangeFont clearButtonMargin defaultAlignment defaultPosition">CE</button>
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<button id="ClearAllButton" class="defaultSize signChangeFont clearAllButtonMargin defaultAlignment defaultPosition">C</button>
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<button id="EqualButton" class="defaultSize defaultFont equalButtonMargin defaultAlignment defaultPosition">=</button>
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<script src="mainWindow.js"></script>
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<script src="Element.js"></script>
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<script src="NumberBuilder.js"></script>
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<script src="CalculatorModel.js"></script>
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</body>
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</html>

‎main.js

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const electron = require('electron');
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const app = electron.app;
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const BrowserWindow = electron.BrowserWindow;
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function createWindow () {
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// Create the browser window.
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let win = new BrowserWindow({
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height: 640,
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width: 480,
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webPreferences: {
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nodeIntegration: true
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}
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})
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// and load the index.html of the app.
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win.loadFile('index.html');
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win.webContents.openDevTools();
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win.removeMenu();
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}
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app.whenReady().then(createWindow)

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