[4기 - 배준일] 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

calculator/build.gradle

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+plugins {
+    id 'java'
+}
+
+group 'com.programmers'
+version '1.0-SNAPSHOT'
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation 'org.junit.jupiter:junit-jupiter:5.8.1'
+    testImplementation 'org.junit.jupiter:junit-jupiter-api:5.8.1'
+    testRuntimeOnly 'org.junit.jupiter:junit-jupiter-engine:5.8.1'
+
+    compileOnly 'org.projectlombok:lombok:1.18.28'
+    annotationProcessor 'org.projectlombok:lombok:1.18.28'
+    testCompileOnly 'org.projectlombok:lombok:1.18.28'
+    testAnnotationProcessor 'org.projectlombok:lombok:1.18.28'
+
+    implementation "org.assertj:assertj-core:3.11.1"
+}
+
+test {
+    useJUnitPlatform()
+}

calculator/settings.gradle

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+rootProject.name = 'calculator'
+

calculator/src/main/java/com/programmers/App.java

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+package com.programmers;
+
+import com.programmers.engine.model.CalculationFormula;
+import com.programmers.engine.model.Menu;
+
+public class App {
+
+  public static void main(String[] args) {
+    Menu menu = new Menu();
+    CalculationFormula calculationFormula = new CalculationFormula();
+    Calculator calculator = new Calculator(menu, menu, calculationFormula, menu);
+
+    calculator.run();
+  }
+}

calculator/src/main/java/com/programmers/Calculator.java

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+package com.programmers;
+
+import com.programmers.engine.io.Input;
+import com.programmers.engine.io.Output;
+import com.programmers.engine.model.CalculationFormula;
+import com.programmers.engine.model.Menu;
+import lombok.AllArgsConstructor;
+
+@AllArgsConstructor
+public class Calculator implements Runnable {
+
+  public static final int HISTORY = 1;
+  public static final int CALCULATE = 2;
+  public static final int EXIT = 3;
+  private final Input input;
+  private final Output output;
+  private final CalculationFormula calculationFormula;
+  private final Menu menu;
+
+  @Override
+  public void run() {
+    while (true) {
+      output.showMenu();
+
+      switch (input.selectOption()) {
+        case HISTORY:
+          calculationFormula.showResult();
+          continue;
+        case CALCULATE:
+          String formula = menu.getInfix();
+          calculationFormula.calculate(formula);
+          continue;
+        case EXIT:
+          output.exit();
+          return;
+        default:
+          output.incorrectOption();
+      }
+    }
+  }
+}

calculator/src/main/java/com/programmers/engine/converter/InfixToPostfix.java

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+package com.programmers.engine.converter;
+
+import java.util.Stack;
+
+public class InfixToPostfix {
+
+  private static int getPriority(char operator) {
+    switch (operator) {
+      case '+':
+      case '-':
+        return 1;
+      case '*':
+      case '/':
+        return 2;
+    }
+    return -1;
+  }
+
+  public static String InfixToPostfix(String infix) {
+    StringBuilder postfixStringBuilder = new StringBuilder();
+    Stack<Character> operatorStack = new Stack<>();
+
+    for (int i = 0; i < infix.length(); i++) {
+      char ch = infix.charAt(i);
+
+      if (ch == ' ') {
+        continue;
+      }
+
+      if (isDigit(ch)) {
+        postfixStringBuilder.append(ch);
+      } else {
+        while (isPriority(operatorStack, ch)) {
+          postfixStringBuilder.append(operatorStack.pop());
+        }
+        operatorStack.push(ch);
+      }
+    }
+
+    while (!operatorStack.isEmpty()) {
+      postfixStringBuilder.append(operatorStack.pop());
+    }
+    return postfixStringBuilder.toString();
+  }
+
+  private static boolean isDigit(char ch) {
+    return Character.isDigit(ch);
+  }
+
+  private static boolean isPriority(Stack<Character> operatorStack, char ch) {
+    return !operatorStack.isEmpty() && getPriority(ch) <= getPriority(
+        operatorStack.peek());
+  }
+}

calculator/src/main/java/com/programmers/engine/converter/PostfixToAnswer.java

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+package com.programmers.engine.converter;
+
+import com.programmers.engine.model.Operator;
+import java.util.Stack;
+
+public class PostfixToAnswer {
+
+  public static double PostfixToAnswer(String postfix) {
+    Stack<Double> operandStack = new Stack<>();
+
+    for (int i = 0; i < postfix.length(); i++) {
+      char ch = postfix.charAt(i);
+
+      if (ch == ' ') {
+        continue;
+      }
+
+      if (isDigit(ch)) {
+        operandStack.push((double) (ch - '0'));
+      } else {
+        Operator operator = Operator.fromSymbol(ch);
+        double rightOperand = operandStack.pop();
+        double leftOperand = operandStack.pop();
+        double result = operator.calculate(leftOperand, rightOperand);
+
+        operandStack.push(result);
+      }
+    }
+    return operandStack.pop();
+  }
+
+  private static boolean isDigit(char ch) {
+    return Character.isDigit(ch);
+  }
+}
+

calculator/src/main/java/com/programmers/engine/io/Input.java

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+package com.programmers.engine.io;
+
+public interface Input {
+
+  int selectOption();
+
+  String getInfix();
+
+  String getReplacedInfix(String infix);
+}

calculator/src/main/java/com/programmers/engine/io/Output.java

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+package com.programmers.engine.io;
+
+public interface Output {
+
+  void showMenu();
+
+  void exit();
+
+  void incorrectOption();
+}