[4기 - 한희나] 1~2주차 과제 : 계산기 미션 제출합니다.

.gitignore

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+# Ignore Gradle project-specific cache directory
+.gradle
+
+# Ignore Gradle build output directory
+build
+### Java template
+# 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*
+
+### JetBrains template
+# 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
+
+# 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
+
+# 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
+
+# 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
+
+### Java template
+# 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*
+
+### JetBrains template
+# 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
+
+# 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
+
+# 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
+
+# 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
+
+### Gradle template
+.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
+
+# Cache of project
+.gradletasknamecache
+
+# # Work around https://youtrack.jetbrains.com/issue/IDEA-116898
+# gradle/wrapper/gradle-wrapper.properties
+

app/build.gradle

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+/*
+ * This file was generated by the Gradle 'init' task.
+ *
+ * This generated file contains a sample Java application project to get you started.
+ * For more details take a look at the 'Building Java & JVM projects' chapter in the Gradle
+ * User Manual available at https://docs.gradle.org/8.1.1/userguide/building_java_projects.html
+ * This project uses @Incubating APIs which are subject to change.
+ */
+
+plugins {
+    // Apply the application plugin to add support for building a CLI application in Java.
+    id 'application'
+}
+
+repositories {
+    // Use Maven Central for resolving dependencies.
+    mavenCentral()
+}
+
+dependencies {
+    // This dependency is used by the application.
+    implementation 'com.google.guava:guava:31.1-jre'
+
+    // https://mvnrepository.com/artifact/org.assertj/assertj-core
+    testImplementation 'org.assertj:assertj-core:3.24.2'
+}
+
+testing {
+    suites {
+        // Configure the built-in test suite
+        test {
+            // Use JUnit Jupiter test framework
+            useJUnitJupiter('5.9.1')
+        }
+    }
+}
+
+// Apply a specific Java toolchain to ease working on different environments.
+java {
+    toolchain {
+        languageVersion = JavaLanguageVersion.of(11)
+    }
+}
+
+application {
+    // Define the main class for the application.
+    mainClass = 'com.programmers.App'
+}

app/src/main/java/com/programmers/CalculatorApplication.java

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+/*
+ * This Java source file was generated by the Gradle 'init' task.
+ */
+package com.programmers;
+
+import com.programmers.controller.CalculatorController;
+
+public class CalculatorApplication {
+
+    public static void main(String[] args) {
+	    CalculatorController calculatorController = new CalculatorController();
+		calculatorController.run();
+    }
+
+}

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

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+package com.programmers.calculator;
+
+import java.util.List;
+
+public class Calculator {
+
+	private final PostfixConversion postfixConversion;
+	private final PostfixCalculator postfixCalculator;
+
+	public Calculator() {
+		postfixConversion = new PostfixConversion();
+		postfixCalculator = new PostfixCalculator();
+	}
+
+	public Integer calculate(Formula formula) {
+		List<String> postfix = postfixConversion.changeInfixToPostfix(formula.getInfixListFormula());
+		return postfixCalculator.calculatePostfix(postfix);
+	}
+
+}

app/src/main/java/com/programmers/calculator/Formula.java

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+package com.programmers.calculator;
+
+import com.programmers.exception.InvalidFormulaException;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.regex.Pattern;
+import java.util.stream.Collectors;
+
+public class Formula {
+
+	private static final Pattern FORMULA_REGEX = Pattern.compile("([0-9] [+|\\-|*|/] )+[0-9]");
+	private static final String EQUAL = " = ";
+
+	private final Calculator calculator;
+
+	private String formula;
+	private Integer result;
+
+	public Formula(String formula) {
+		isValid(formula);
+		this.formula = formula;
+		this.calculator = new Calculator();
+	}
+
+	public List<String> getInfixListFormula() {
+		return Arrays.stream(formula.split(" "))
+			         .collect(Collectors.toList());
+	}
+
+	public void isValid(String formula) {
+		if (!FORMULA_REGEX.matcher(formula).matches()) throw new InvalidFormulaException("유효하지 않은 수식 입력입니다.");
+	}
+
+	public Integer calcualteFormula() {
+		result = calculator.calculate(this);
+		return result;
+	}
+
+	public String toString() {
+		return formula + EQUAL + result;
+	}
+
+}

app/src/main/java/com/programmers/calculator/PostfixCalculator.java

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+package com.programmers.calculator;
+
+import com.programmers.util.Operator;
+
+import java.util.ArrayDeque;
+import java.util.Deque;
+import java.util.List;
+import java.util.regex.Pattern;
+
+public class PostfixCalculator {
+
+	private static final Pattern NUMBER = Pattern.compile("\\d+");
+
+	public Integer calculatePostfix(List<String> postfix) {
+		Deque<Integer> deque = new ArrayDeque<>();
+
+		postfix.stream()
+				.forEach(s -> { calculatePostfixWithDeque(s, deque); });
+
+		return deque.pollLast();
+	}
+
+	private void calculatePostfixWithDeque(String s, Deque<Integer> deque) {
+		if (NUMBER.matcher(s).matches()) {
+			deque.addLast(Integer.parseInt(s));
+			return;
+		}
+		// 연산자 일 경우
+		Integer op1 = deque.pollLast();
+		Integer op2 = deque.pollLast();
+
+		Operator calc = Operator.of(s);
+		Integer result = calc.calculateOperation(op2, op1);
+
+		deque.addLast(result);
+	}
+
+}