codan - checker for comments

implement few code style rules for comments
- no line comments (sometimes enforced)
- no nested comments (no /* in block comment)

Change-Id: Ib4042a8ffab0dc1c5effd7b77ab6d2f51a1e6cae

codan/org.eclipse.cdt.codan.checkers/plugin.xml

@@ -398,5 +398,31 @@
             name="%problem.name.ClassMembersInitialization">
          </problem>
       </checker>
+      <checker
+            class="org.eclipse.cdt.codan.internal.checkers.CommentChecker"
+            id="org.eclipse.cdt.codan.internal.checkers.CommentChecker"
+            name="Comment Checks">
+         <problem
+               category="org.eclipse.cdt.codan.core.categories.CodeStyle"
+               defaultEnabled="false"
+               defaultSeverity="Error"
+               description="This rule will flag usage of // style comments. Only applicable for C code, not C++"
+               id="org.eclipse.cdt.codan.checkers.nolinecomment"
+               markerType="org.eclipse.cdt.codan.core.codanProblem"
+               messagePattern="Line comments are not allowed"
+               multiple="false"
+               name="Line comments // are not allowed">
+         </problem>
+         <problem
+               category="org.eclipse.cdt.codan.core.categories.CodeStyle"
+               defaultEnabled="false"
+               defaultSeverity="Error"
+               description="This rule will flag usage of /* inside another comment."
+               id="org.eclipse.cdt.codan.checkers.nocommentinside"
+               markerType="org.eclipse.cdt.codan.core.codanProblem"
+               messagePattern="Sequence  /* used inside the comment"
+               name="No nesting comments">
+         </problem>
+      </checker>
    </extension>
 </plugin>

codan/org.eclipse.cdt.codan.checkers/src/org/eclipse/cdt/codan/internal/checkers/CommentChecker.java

@@ -0,0 +1,63 @@
+/*******************************************************************************
+ * Copyright (c) 2015 QNX Software System and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Elena Laskavaia (QNX Software System) - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.codan.internal.checkers;
+
+import org.eclipse.cdt.codan.core.cxx.model.AbstractIndexAstChecker;
+import org.eclipse.cdt.codan.core.model.IProblemLocation;
+import org.eclipse.cdt.codan.core.model.IProblemLocationFactory;
+import org.eclipse.cdt.core.dom.ILinkage;
+import org.eclipse.cdt.core.dom.ast.IASTComment;
+import org.eclipse.cdt.core.dom.ast.IASTFileLocation;
+import org.eclipse.cdt.core.dom.ast.IASTTranslationUnit;
+
+/**
+ * Checker for some specific code style violations in comments
+ */
+public class CommentChecker extends AbstractIndexAstChecker {
+	public static final String COMMENT_NO_LINE = "org.eclipse.cdt.codan.checkers.nolinecomment"; //$NON-NLS-1$
+	public static final String COMMENT_NO_START = "org.eclipse.cdt.codan.checkers.nocommentinside"; //$NON-NLS-1$
+	private boolean conly;
+
+	@Override
+	public void processAst(IASTTranslationUnit ast) {
+		IASTComment[] comments = ast.getComments();
+		if (comments == null)
+			return;
+		conly = ast.getLinkage().getLinkageID() == ILinkage.C_LINKAGE_ID;
+		if (!conly && shouldProduceProblem(getProblemById(COMMENT_NO_START, getFile()), 
+				getFile().getFullPath())==false)
+			return; // c++ file and COMMENT_NO_START is disabled - optimize and bail
+		for (IASTComment comment : comments) {
+			processComment(comment);
+		}
+	}
+
+	protected void processComment(IASTComment comment) {
+		boolean blockComment = comment.isBlockComment();
+		if (blockComment) {
+			String commentStr = comment.getRawSignature();
+			int pos = commentStr.indexOf("/*", 2); //$NON-NLS-1$
+			if (pos >= 0) {
+				reportProblem(COMMENT_NO_START, getProblemLocation(comment.getFileLocation(), pos));
+			}
+		} else {
+			if (conly) {
+				reportProblem(COMMENT_NO_LINE, comment);
+			}
+		}
+	}
+
+	@SuppressWarnings("deprecation")
+	private IProblemLocation getProblemLocation(IASTFileLocation astLocation, int pos) {
+		IProblemLocationFactory locFactory = getRuntime().getProblemLocationFactory();
+		return locFactory.createProblemLocation(getFile(), astLocation.getNodeOffset() + pos, astLocation.getNodeOffset() + pos + 2);
+	}
+}

codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/core/internal/checkers/CommentCheckerLineTests.java

@@ -0,0 +1,81 @@
+/*******************************************************************************
+ * Copyright (c) 2015 QNX Software System and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Elena Laskavaia (QNX Software System) - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.codan.core.internal.checkers;
+
+import java.io.File;
+
+import org.eclipse.cdt.codan.core.test.CheckerTestCase;
+import org.eclipse.cdt.codan.internal.checkers.CommentChecker;
+import org.junit.Test;
+
+/**
+ * Tests for CommentChecker
+ */
+public class CommentCheckerLineTests extends CheckerTestCase {
+	@Override
+	public void setUp() throws Exception {
+		super.setUp();
+		enableProblems(CommentChecker.COMMENT_NO_LINE);
+	}
+
+	//	void foo() {
+	//	  return; // error
+	//	}
+	@Test
+	public void testLineComment() {
+		checkSampleAbove();
+	}
+
+	//	void foo() {
+	//	  return;
+	//	}
+	@Test
+	public void testNoLineComment() {
+		checkSampleAbove();
+	}
+
+	//	char * foo() {
+	//	  return "// this is a string";
+	//	}
+	@Test
+	public void testNoLineCommentInString() {
+		checkSampleAbove();
+	}
+
+	//	void foo() {
+	//	  return; // not an error in c++
+	//	}
+	@Test
+	public void testLineCommentCpp() {
+		checkSampleAboveCpp();
+	}
+
+	//	#define AAA // error even in prepro
+	@Test
+	public void testLineCommentInPrepro() {
+		checkSampleAbove();
+	}
+
+	// @file:test.h
+	// int foo();// error too
+
+
+	// @file:test.c
+	// #include "test.h"
+	// int bar() {
+	//    foo();
+	// }
+	public void testHeader() throws Exception {
+		loadcode(getContents(2));
+		runOnProject();
+		checkErrorLine(new File("test.h"), 1); //$NON-NLS-1$
+	}
+}

codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/core/internal/checkers/CommentCheckerNestedTests.java

@@ -0,0 +1,51 @@
+/*******************************************************************************
+ * Copyright (c) 2015 QNX Software System and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     Elena Laskavaia (QNX Software System) - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.codan.core.internal.checkers;
+
+import org.eclipse.cdt.codan.core.test.CheckerTestCase;
+import org.eclipse.cdt.codan.internal.checkers.CommentChecker;
+import org.junit.Test;
+
+/**
+ * Tests for CommentChecker
+ */
+public class CommentCheckerNestedTests extends CheckerTestCase {
+	@Override
+	public void setUp() throws Exception {
+		super.setUp();
+		enableProblems(CommentChecker.COMMENT_NO_START);
+	}
+
+	//	void foo() {
+	//	  return; /* /* */ // error
+	//	}
+	@Test
+	public void testLineComment() {
+		checkSampleAbove();
+	}
+	//	void foo() {
+	//	  return; /*
+	//    /* // error
+	//    */
+	//	}
+	@Test
+	public void testLineComment2() {
+		checkSampleAbove();
+	}
+
+	//	void foo() {
+	//	  return; /* */
+	//	}
+	@Test
+	public void testNoLineComment() {
+		checkSampleAbove();
+	}
+}

codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/core/test/AutomatedIntegrationSuite.java

@@ -21,6 +21,8 @@ import org.eclipse.cdt.codan.core.internal.checkers.AssignmentToItselfCheckerTes
 import org.eclipse.cdt.codan.core.internal.checkers.CaseBreakCheckerTest;
 import org.eclipse.cdt.codan.core.internal.checkers.CatchByReferenceTest;
 import org.eclipse.cdt.codan.core.internal.checkers.ClassMembersInitializationCheckerTest;
+import org.eclipse.cdt.codan.core.internal.checkers.CommentCheckerLineTests;
+import org.eclipse.cdt.codan.core.internal.checkers.CommentCheckerNestedTests;
 import org.eclipse.cdt.codan.core.internal.checkers.FormatStringCheckerTest;
 import org.eclipse.cdt.codan.core.internal.checkers.NonVirtualDestructorCheckerTest;
 import org.eclipse.cdt.codan.core.internal.checkers.ProblemBindingCheckerTest;
@@ -70,6 +72,8 @@ public class AutomatedIntegrationSuite extends TestSuite {
 		suite.addTestSuite(SuggestedParenthesisCheckerTest.class);
 		suite.addTestSuite(SuspiciousSemicolonCheckerTest.class);
 		suite.addTestSuite(UnusedSymbolInFileScopeCheckerTest.class);
+		suite.addTestSuite(CommentCheckerLineTests.class);
+		suite.addTestSuite(CommentCheckerNestedTests.class);
 		// framework
 		suite.addTest(CodanFastTestSuite.suite());
 		// quick fixes

codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/core/test/CheckerTestCase.java

@@ -220,6 +220,10 @@ public class CheckerTestCase extends CodanTestCase {
 		}
 	}
 
+	/**
+	 * Enable given problems and disable the rest
+	 * @param ids
+	 */
 	protected void enableProblems(String... ids) {
 		IProblemProfile profile = CodanRuntime.getInstance().getCheckersRegistry().getWorkspaceProfile();
 		IProblem[] problems = profile.getProblems();

codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/core/test/CodanTestCase.java

@@ -48,7 +48,7 @@ public class CodanTestCase extends BaseTestCase {
 	protected File currentFile;
 	protected ICElement currentCElem;
 	protected IFile currentIFile;
-	protected ArrayList<Integer> errLines= new ArrayList<Integer>();
+	protected ArrayList<Integer> errLines = new ArrayList<Integer>();
 
 	/**
 	 *
@@ -99,13 +99,17 @@ public class CodanTestCase extends BaseTestCase {
 	 * @throws CoreException
 	 */
 	private void removeLeftOverProjects() throws CoreException {
-		final IWorkspace workspace = ResourcesPlugin.getWorkspace();
+		try {
-		IProject[] projects = workspace.getRoot().getProjects();
+			final IWorkspace workspace = ResourcesPlugin.getWorkspace();
-		for (int i = 0; i < projects.length; i++) {
+			IProject[] projects = workspace.getRoot().getProjects();
-			IProject p = projects[i];
+			for (int i = 0; i < projects.length; i++) {
-			if (p.getName().startsWith("Codan")) {
+				IProject p = projects[i];
-				p.delete(IResource.FORCE | IResource.ALWAYS_DELETE_PROJECT_CONTENT, new NullProgressMonitor());
+				if (p.getName().startsWith("Codan")) {
+					p.delete(IResource.FORCE | IResource.ALWAYS_DELETE_PROJECT_CONTENT, new NullProgressMonitor());
+				}
 			}
+		} catch (Throwable e) {
+			// moving on...
 		}
 	}
 
@@ -175,8 +179,7 @@ public class CodanTestCase extends BaseTestCase {
 
 	protected StringBuilder[] getContents(int sections) {
 		try {
-			return TestSourceReader.getContentsForTest(getPlugin().getBundle(), getSourcePrefix(),
+			return TestSourceReader.getContentsForTest(getPlugin().getBundle(), getSourcePrefix(), getClass(), getName(), sections);
-					getClass(), getName(), sections);
 		} catch (IOException e) {
 			fail(e.getMessage());
 			return null;
@@ -215,11 +218,6 @@ public class CodanTestCase extends BaseTestCase {
 		return loadcode(code, testFile);
 	}
 
-	public File loadcode(String code, String filename) {
-		File testFile = new File(tmpDir, filename);
-		return loadcode(code, testFile);
-	}
-
 	private File loadcode(String code, File testFile) {
 		try {
 			tempFiles.add(testFile);
@@ -246,14 +244,14 @@ public class CodanTestCase extends BaseTestCase {
 			return null;
 		}
 	}
-
 	private static Pattern COMMENT_TAG_PATTERN = Pattern.compile("//\\s*(err|ERR|ERROR|error)\\b");
+
 	private void loadErrorComments(String trim) {
 		String[] lines = trim.split("\n");
 		for (int i = 0; i < lines.length; i++) {
 			String string = lines[i];
 			if (COMMENT_TAG_PATTERN.matcher(string).find()) {
-				errLines.add(i+1);
+				errLines.add(i + 1);
 			}
 		}
 	}
@@ -269,4 +267,12 @@ public class CodanTestCase extends BaseTestCase {
 	public File loadcode(String code) {
 		return loadcode(code, isCpp());
 	}
+
+	public File loadcode(CharSequence... more) {
+		File file = null;
+		for (CharSequence cseq : more) {
+			file = loadcode(cseq.toString(), isCpp());
+		}
+		return file;
+	}
 }