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

.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/java,intellij,gradle
+# Edit at https://www.toptal.com/developers/gitignore?templates=java,intellij,gradle
+
+### Intellij ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+.idea/**/workspace.xml
+.idea/**/tasks.xml
+.idea/**/usage.statistics.xml
+.idea/**/dictionaries
+.idea/**/shelf
+
+# AWS User-specific
+.idea/**/aws.xml
+
+# Generated files
+.idea/**/contentModel.xml
+
+# Sensitive or high-churn files
+.idea/**/dataSources/
+.idea/**/dataSources.ids
+.idea/**/dataSources.local.xml
+.idea/**/sqlDataSources.xml
+.idea/**/dynamic.xml
+.idea/**/uiDesigner.xml
+.idea/**/dbnavigator.xml
+
+# Gradle
+.idea/**/gradle.xml
+.idea/**/libraries
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+.idea
+gradle
+gradlew
+gradlew.bat
+
+# CMake
+cmake-build-*/
+
+# Mongo Explorer plugin
+.idea/**/mongoSettings.xml
+
+# File-based project format
+*.iws
+
+# IntelliJ
+out/
+
+# mpeltonen/sbt-idea plugin
+.idea_modules/
+
+# JIRA plugin
+atlassian-ide-plugin.xml
+
+# Cursive Clojure plugin
+.idea/replstate.xml
+
+# SonarLint plugin
+.idea/sonarlint/
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+com_crashlytics_export_strings.xml
+crashlytics.properties
+crashlytics-build.properties
+fabric.properties
+
+# Editor-based Rest Client
+.idea/httpRequests
+
+# Android studio 3.1+ serialized cache file
+.idea/caches/build_file_checksums.ser
+
+### Intellij Patch ###
+# Comment Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-215987721
+
+# *.iml
+# modules.xml
+# .idea/misc.xml
+# *.ipr
+
+# Sonarlint plugin
+# https://plugins.jetbrains.com/plugin/7973-sonarlint
+.idea/**/sonarlint/
+
+# SonarQube Plugin
+# https://plugins.jetbrains.com/plugin/7238-sonarqube-community-plugin
+.idea/**/sonarIssues.xml
+
+# Markdown Navigator plugin
+# https://plugins.jetbrains.com/plugin/7896-markdown-navigator-enhanced
+.idea/**/markdown-navigator.xml
+.idea/**/markdown-navigator-enh.xml
+.idea/**/markdown-navigator/
+
+# Cache file creation bug
+# See https://youtrack.jetbrains.com/issue/JBR-2257
+.idea/$CACHE_FILE$
+
+# CodeStream plugin
+# https://plugins.jetbrains.com/plugin/12206-codestream
+.idea/codestream.xml
+
+# Azure Toolkit for IntelliJ plugin
+# https://plugins.jetbrains.com/plugin/8053-azure-toolkit-for-intellij
+.idea/**/azureSettings.xml
+
+### Java ###
+# Compiled class file
+*.class
+
+# Log file
+*.log
+
+# BlueJ files
+*.ctxt
+
+# Mobile Tools for Java (J2ME)
+.mtj.tmp/
+
+# Package Files #
+*.jar
+*.war
+*.nar
+*.ear
+*.zip
+*.tar.gz
+*.rar
+
+# virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
+hs_err_pid*
+replay_pid*
+
+### Gradle ###
+.gradle
+**/build/
+!src/**/build/
+
+# Ignore Gradle GUI config
+gradle-app.setting
+
+# Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
+!gradle-wrapper.jar
+
+# Avoid ignore Gradle wrappper properties
+!gradle-wrapper.properties
+
+# Cache of project
+.gradletasknamecache
+
+# Eclipse Gradle plugin generated files
+# Eclipse Core
+.project
+# JDT-specific (Eclipse Java Development Tools)
+.classpath
+
+### Gradle Patch ###
+# Java heap dump
+*.hprof
+
+# End of https://www.toptal.com/developers/gitignore/api/java,intellij,gradle

build.gradle

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

settings.gradle

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+rootProject.name = 'JavaCalculator'
+

src/main/java/org/programmers/java/App.java

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

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

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

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

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

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

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