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JoosungKwonJoosungKwon
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[4기 - 황창현] 1~2주차 과제 : 계산기 구현 미션 제출합니다.
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‎.gitignore

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# Created by https://www.toptal.com/developers/gitignore/api/java,intellij,gradle
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# Edit at https://www.toptal.com/developers/gitignore?templates=java,intellij,gradle
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### Intellij ###
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# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
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# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
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# User-specific stuff
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# AWS User-specific
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# Gradle
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# *.iml
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# *.ipr
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gradle
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# End of https://www.toptal.com/developers/gitignore/api/java,intellij,gradle

‎build.gradle

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plugins {
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id 'java'
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}
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group = 'org.programmers.java'
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version = '1.0-SNAPSHOT'
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repositories {
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mavenCentral()
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}
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dependencies {
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testImplementation platform('org.junit:junit-bom:5.9.1')
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testImplementation 'org.junit.jupiter:junit-jupiter'
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}
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test {
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useJUnitPlatform()
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}

‎settings.gradle

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rootProject.name = 'JavaCalculator'
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‎src/main/java/org/programmers/java/App.java

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package org.programmers.java;
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import org.programmers.java.calculation.Calculation;
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import org.programmers.java.repository.FormulaRepository;
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import org.programmers.java.repository.FormulaMemoryRepository;
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public class App {
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public static void main(String[] args){
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Calculation calculation = new Calculation();
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FormulaRepository formulaRepository = new FormulaMemoryRepository();
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Calculator calculator = new Calculator(calculation, formulaRepository);
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calculator.run();
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}
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}

‎src/main/java/org/programmers/java/Calculator.java

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package org.programmers.java;
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import org.programmers.java.calculation.Calculation;
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import org.programmers.java.console.Console;
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import org.programmers.java.console.Input;
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import org.programmers.java.console.Output;
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import org.programmers.java.message.Error;
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import org.programmers.java.message.FunctionSelect;
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import org.programmers.java.repository.FormulaRepository;
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import org.programmers.java.validator.Validator;
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public class Calculator {
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private boolean programStatus = true;
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private final Input input;
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private final Output output;
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private final Calculation calculation;
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private final FormulaRepository formulaRepository;
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public Calculator(Calculation calculation, FormulaRepository formulaRepository){
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this.input = Console.getInstance();
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this.output = Console.getInstance();
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this.calculation = calculation;
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this.formulaRepository = formulaRepository;
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}
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void run() {
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while (programStatus) {
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output.menuMsg();
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String selectNum = input.selectNumInput();
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output.selectMsg(selectNum);
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FunctionSelect selectMenu = getFunctionSelectNumber(selectNum);
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switch (selectMenu) {
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case CHECK:
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output.getCalculationValues(formulaRepository.getFormulaList());
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break;
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case CALCULATION:
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formulaCalculate();
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break;
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case EXIT:
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output.exitMsg();
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programStatus = false;
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break;
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case WRONGINPUT:
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output.errorMsg(Error.SELECT_VALIDATION.getMsg());
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break;
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}
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}
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}
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private FunctionSelect getFunctionSelectNumber(String selectNum) {
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return FunctionSelect.findSelect(selectNum).orElse(FunctionSelect.WRONGINPUT);
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}
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private void formulaCalculate() {
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String inputFormula = input.formulaInput();
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Validator.formulaValidate(inputFormula);
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String result = calculation.requestCalculate(inputFormula);
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output.calculationValue(result);
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String formulaAndResult = formattingFormula(inputFormula, result);
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formulaRepository.save(formulaAndResult);
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}
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private String formattingFormula(String inputFormula, String result){
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StringBuilder stringBuilder = new StringBuilder();
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return stringBuilder
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.append(inputFormula)
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.append("=")
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.append(result)
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.toString();
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}
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}

‎src/main/java/org/programmers/java/calculation/Calculation.java

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package org.programmers.java.calculation;
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import java.util.*;
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public class Calculation {
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private final InfixToPostfixConverter infixToPostfixConverter;
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private final PostfixCalculation postfixCalculation;
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public Calculation() {
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this.infixToPostfixConverter = new InfixToPostfixConverter();
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this.postfixCalculation = new PostfixCalculation();
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}
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public String requestCalculate(String inputFormula){
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String[] formulaList = inputFormula.split(" ");
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List<String> postfixOperator = infixToPostfixConverter.convert(formulaList);
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String result = postfixCalculation.calculate(postfixOperator);
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return result;
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}
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}

‎src/main/java/org/programmers/java/calculation/InfixToPostfixConverter.java

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package org.programmers.java.calculation;
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import java.util.ArrayDeque;
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import java.util.ArrayList;
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import java.util.Deque;
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import java.util.List;
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public class InfixToPostfixConverter {
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List<String> postfixOperator = new ArrayList<>();
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Deque<String> operatorDeque = new ArrayDeque<>();
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public List<String> convert(String[] formulaList){
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for(String operatorOrOperand : formulaList){
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operandAddInPostfix(operatorOrOperand);
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checkOperatorToAddPostfix(operatorOrOperand);
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}
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while(operatorDeque.size() > 0){
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postfixOperator.add(operatorDeque.removeLast());
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}
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return postfixOperator;
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}
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private void operandAddInPostfix(String operatorOrOperand){
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if(Operator.isNumber(operatorOrOperand)){
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postfixOperator.add(operatorOrOperand);
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}
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}
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private void checkOperatorToAddPostfix(String operatorOrOperand) {
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if (Operator.findSymbol(operatorOrOperand).isPresent()) {
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checkOperatorStackAndCompare(operatorOrOperand);
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}
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}
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private void checkOperatorStackAndCompare(String operatorOrOperand){
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while (!operatorDeque.isEmpty() && comparePriorities(operatorOrOperand)) {
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postfixOperator.add(operatorDeque.removeLast());
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}
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operatorDeque.add(operatorOrOperand);
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}
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private boolean comparePriorities(String operatorOrOperand){
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return Operator.comparePriorities(operatorDeque.peekLast(), operatorOrOperand);
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}
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}

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