Added support C++ in the projects (#144)

* Added CheckLibraryVersion class for check library version

* Fixed CheckLibraryVersion class

* deleted non-usable dependencies

* Fixed exception

* Fixed exception

* Fixed exception/omit catch block

* improvement for CheckLibraryVersion

* added cpp executor and cpp searcher (#143)

* added cpp executor and cpp searcher

* improved regular expression for cpp_searcher.java

* Update CppExecutor.java

reformat compilation command

src/main/java/org/hyperskill/hstest/checker/CheckLibraryVersion.java

@@ -0,0 +1,108 @@
+package org.hyperskill.hstest.checker;
+
+import com.google.gson.Gson;
+import com.google.gson.reflect.TypeToken;
+
+import java.io.*;
+import java.lang.reflect.Type;
+import java.net.HttpURLConnection;
+import java.net.SocketTimeoutException;
+import java.net.URL;
+import java.time.LocalDate;
+import java.util.Map;
+import java.util.stream.Collectors;
+
+/**
+* Checks if the current version of the library is the latest one on GitHub releases page of the library.
+* If not, throws an exception.
+ */
+public class CheckLibraryVersion {
+
+    private String VERSION_FILE = "src/main/java/org/hyperskill/hstest/resources/version.txt";
+    private String LAST_CHECKED_FILE = "lastCheckedHSTestLibrary.txt";
+    private String GITHUB_API = "https://api.github.com/repos/hyperskill/hs-test/releases/latest";
+    private String currentVersion;
+    private String latestVersion;
+    public boolean isLatestVersion = true;
+
+    public CheckLibraryVersion() {
+    }
+
+    /**
+     * Checks if the current version of the library is the latest one on GitHub releases page of the library.
+     * If not, throws an exception.
+     */
+    public void checkVersion() throws IOException {
+        LocalDate lastChecked = null;
+        String tempDirectoryPath = System.getProperty("java.io.tmpdir");
+        File lastCheckedFile = new File(tempDirectoryPath + File.separator + LAST_CHECKED_FILE);
+        if (lastCheckedFile.exists()) {
+            try (BufferedReader reader = new BufferedReader(new FileReader(lastCheckedFile))) {
+                lastChecked = LocalDate.parse(reader.readLine());
+            }
+        }
+        if (LocalDate.now().equals(lastChecked)) {
+            return;
+        }
+        InputStream inputStream = getClass().getClassLoader().getResourceAsStream(VERSION_FILE);
+        if (inputStream != null) {
+            currentVersion = new BufferedReader(new InputStreamReader(inputStream)).readLine();
+        } else return;
+        latestVersion = getLatestHsTestVersionFromGitHub();
+        if (!currentVersion.equals(latestVersion)) {
+            isLatestVersion = false;
+        }
+        lastChecked = LocalDate.now();
+        try (FileWriter writer = new FileWriter(lastCheckedFile)) {
+            writer.write(lastChecked.toString());
+        }
+    }
+
+    /**
+     * Returns latest version of the library from GitHub releases page of the library.
+     * @return String latest version of the library
+     */
+    private String getLatestHsTestVersionFromGitHub() {
+        HttpURLConnection connection = null;
+        int responseCode = -1;
+        try {
+            URL url = new URL(GITHUB_API);
+            connection = (HttpURLConnection) url.openConnection();
+            connection.setRequestMethod("GET");
+            connection.setRequestProperty("Accept", "application/vnd.github+json");
+            connection.setConnectTimeout(100);
+            connection.setReadTimeout(500);
+            responseCode = connection.getResponseCode();
+        } catch (IOException e) {
+            return currentVersion;
+        }
+        if (responseCode != 200) {
+            return currentVersion;
+        }
+
+        try (BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()))) {
+            String response = in.lines().collect(Collectors.joining());
+            Gson gson = new Gson();
+            Type type = new TypeToken<Map<String, Object>>(){}.getType();
+            Map<String,Object> map = gson.fromJson(response, type);
+            return map.get("tag_name").toString().replace("v", "");
+        } catch (IOException e) {
+            return currentVersion;
+        }
+    }
+
+    /**
+     * Returns feedback for the user if the current version of the library is not the latest one.
+     * @return String feedback for the user
+     */
+    public String getFeedback() {
+        return "\nThe installed hs-test version (" + currentVersion + ") is not the latest version (" + latestVersion + "). " +
+                "Update the library by following the instructions below:\n\n" +
+                "1. Open your project's dependency file build.gradle.\n" +
+                "2. Find the hs-test dependency and change its version to the latest one (" + latestVersion + ").\n" +
+                "3. Sync the dependencies in your development environment or run the following commands in the terminal:\n" +
+                "   For Gradle:\n" +
+                "   gradle clean build --refresh-dependencies\n\n" +
+                "4. Restart the tests.\n\n";
+    }
+}

src/main/java/org/hyperskill/hstest/resources/version.txt

@@ -0,0 +1 @@
+10.0.3

src/main/java/org/hyperskill/hstest/stage/StageTest.java

@@ -1,6 +1,7 @@
 package org.hyperskill.hstest.stage;
 
 import lombok.Getter;
+import org.hyperskill.hstest.checker.CheckLibraryVersion;
 import org.hyperskill.hstest.common.FileUtils;
 import org.hyperskill.hstest.common.ReflectionUtils;
 import org.hyperskill.hstest.dynamic.ClassSearcher;
@@ -14,10 +15,7 @@
 import org.hyperskill.hstest.testcase.TestCase;
 import org.hyperskill.hstest.testing.TestRun;
 import org.hyperskill.hstest.testing.execution.MainMethodExecutor;
-import org.hyperskill.hstest.testing.execution.process.GoExecutor;
-import org.hyperskill.hstest.testing.execution.process.JavascriptExecutor;
-import org.hyperskill.hstest.testing.execution.process.PythonExecutor;
-import org.hyperskill.hstest.testing.execution.process.ShellExecutor;
+import org.hyperskill.hstest.testing.execution.process.*;
 import org.hyperskill.hstest.testing.runner.AsyncDynamicTestingRunner;
 import org.hyperskill.hstest.testing.runner.TestRunner;
 import org.junit.Test;
@@ -84,6 +82,9 @@ private TestRunner initRunner() {
 
         for (var folder : walkUserFiles(FileUtils.cwd())) {
             for (var file : folder.getFiles()) {
+                if (file.getName().endsWith(".cpp")) {
+                    return new AsyncDynamicTestingRunner(CppExecutor.class);
+                }
                 if (file.getName().endsWith(".go")) {
                     return new AsyncDynamicTestingRunner(GoExecutor.class);
                 }
@@ -162,10 +163,14 @@ public final void start() {
 
                 currTestRun = testRun;
                 CheckResult result = testRun.test();
-
                 if (!result.isCorrect()) {
+                    CheckLibraryVersion checkLibraryVersion = new CheckLibraryVersion();
+                    checkLibraryVersion.checkVersion();
                     String fullFeedback = result.getFeedback() + "\n\n"
                         + testRun.getTestCase().getFeedback();
+                    if (!checkLibraryVersion.isLatestVersion) {
+                        fullFeedback += checkLibraryVersion.getFeedback();
+                    }
                     throw new WrongAnswer(fullFeedback.trim());
                 }
 

src/main/java/org/hyperskill/hstest/testing/execution/process/CppExecutor.java

@@ -0,0 +1,70 @@
+package org.hyperskill.hstest.testing.execution.process;
+
+import org.hyperskill.hstest.testing.execution.ProcessExecutor;
+import org.hyperskill.hstest.testing.execution.searcher.CppSearcher;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+
+import static org.hyperskill.hstest.common.FileUtils.abspath;
+import static org.hyperskill.hstest.common.OsUtils.isWindows;
+
+/**
+ * Executes C++ runnable files
+ * (files with main function)
+ * in the given directory.
+ *
+ */
+public class CppExecutor extends ProcessExecutor {
+    private final String executable;
+    private final String filename;
+
+    public CppExecutor(String sourceName) {
+        super(new CppSearcher().find(sourceName));
+
+        var fileName = runnable.getFile().getName();
+
+        var withoutCpp = fileName
+                .substring(0, fileName.length() - new CppSearcher().extension().length());
+
+        if (isWindows()) {
+            executable = withoutCpp;
+            filename = executable + ".exe";
+        } else {
+            executable = "./" + withoutCpp;
+            filename = withoutCpp;
+        }
+    }
+
+    @Override
+    protected List<String> compilationCommand() {
+        return List.of("g++", "-std", "c++20", "-pipe", "-O2", "-static", "-o", filename, runnable.getFile().getName());
+    }
+
+    @Override
+    protected String filterCompilationError(String error) {
+        // Adapt error filtering if needed
+        return error;
+    }
+
+    @Override
+    protected List<String> executionCommand(List<String> args) {
+        List<String> fullArgs = new ArrayList<>();
+        fullArgs.add(executable);
+        fullArgs.addAll(args);
+
+        return fullArgs;
+    }
+
+    @Override
+    protected void cleanup() {
+        try {
+            Files.deleteIfExists(Paths.get(abspath(filename)));
+        } catch (IOException ignored) { }
+    }
+}
+

src/main/java/org/hyperskill/hstest/testing/execution/searcher/CppSearcher.java

@@ -0,0 +1,24 @@
+package org.hyperskill.hstest.testing.execution.searcher;
+
+import org.hyperskill.hstest.testing.execution.runnable.RunnableFile;
+
+/**
+ * Searches for C++ runnable files
+ * (files with main function)
+ * in the given directory
+ * and returns the first one found.
+ */
+public class CppSearcher extends BaseSearcher {
+    @Override
+    public String extension() {
+        return ".cpp";
+    }
+
+    @Override
+    public RunnableFile search(String whereToSearch) {
+        return simpleSearch(whereToSearch,
+                "int main()",
+                "(^|\\n)\\s*int\\s+main\\s*\\(.*\\)"
+        );
+    }
+}