Bug 383576 - Ability to ignore codan errors using line comments

Change-Id: I806e1787fb6cc3be8865cee1d397d581ae4acd8e
Signed-off-by: Alena Laskavaia <elaskavaia.cdt@gmail.com>

10 files changed, 176 insertions, 22 deletions

diff --git a/codan/org.eclipse.cdt.codan.core.cxx/META-INF/MANIFEST.MF b/codan/org.eclipse.cdt.codan.core.cxx/META-INF/MANIFEST.MF
index 880142e5045..dcabf55fa1a 100644
--- a/codan/org.eclipse.cdt.codan.core.cxx/META-INF/MANIFEST.MF
+++ b/codan/org.eclipse.cdt.codan.core.cxx/META-INF/MANIFEST.MF
@@ -2,7 +2,7 @@ Manifest-Version: 1.0
 Bundle-ManifestVersion: 2
 Bundle-Name: %Bundle-Name
 Bundle-SymbolicName: org.eclipse.cdt.codan.core.cxx;singleton:=true
-Bundle-Version: 3.3.0.qualifier
+Bundle-Version: 3.4.0.qualifier
 Bundle-Activator: org.eclipse.cdt.codan.core.cxx.Activator
 Require-Bundle: org.eclipse.core.runtime,
  org.eclipse.cdt.core,
diff --git a/codan/org.eclipse.cdt.codan.core.cxx/pom.xml b/codan/org.eclipse.cdt.codan.core.cxx/pom.xml
index 869b140852b..f5159870bd5 100644
--- a/codan/org.eclipse.cdt.codan.core.cxx/pom.xml
+++ b/codan/org.eclipse.cdt.codan.core.cxx/pom.xml
@@ -11,7 +11,7 @@
 		<relativePath>../../pom.xml</relativePath>
 	</parent>
 
-	<version>3.3.0-SNAPSHOT</version>
+	<version>3.4.0-SNAPSHOT</version>
 	<artifactId>org.eclipse.cdt.codan.core.cxx</artifactId>
 	<packaging>eclipse-plugin</packaging>
 </project>
diff --git a/codan/org.eclipse.cdt.codan.core.cxx/src/org/eclipse/cdt/codan/core/cxx/model/AbstractIndexAstChecker.java b/codan/org.eclipse.cdt.codan.core.cxx/src/org/eclipse/cdt/codan/core/cxx/model/AbstractIndexAstChecker.java
index 64b5fcc8ddd..9fe1930d64d 100644
--- a/codan/org.eclipse.cdt.codan.core.cxx/src/org/eclipse/cdt/codan/core/cxx/model/AbstractIndexAstChecker.java
+++ b/codan/org.eclipse.cdt.codan.core.cxx/src/org/eclipse/cdt/codan/core/cxx/model/AbstractIndexAstChecker.java
@@ -11,6 +11,9 @@
  *******************************************************************************/
 package org.eclipse.cdt.codan.core.cxx.model;
 
+import java.util.ArrayList;
+import java.util.List;
+
 import org.eclipse.cdt.codan.core.cxx.Activator;
 import org.eclipse.cdt.codan.core.model.AbstractCheckerWithProblemPreferences;
 import org.eclipse.cdt.codan.core.model.ICheckerInvocationContext;
@@ -18,6 +21,7 @@ import org.eclipse.cdt.codan.core.model.IProblem;
 import org.eclipse.cdt.codan.core.model.IProblemLocation;
 import org.eclipse.cdt.codan.core.model.IProblemLocationFactory;
 import org.eclipse.cdt.codan.core.model.IRunnableInEditorChecker;
+import org.eclipse.cdt.core.dom.ast.IASTComment;
 import org.eclipse.cdt.core.dom.ast.IASTFileLocation;
 import org.eclipse.cdt.core.dom.ast.IASTImageLocation;
 import org.eclipse.cdt.core.dom.ast.IASTMacroExpansionLocation;
@@ -35,7 +39,8 @@ import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.OperationCanceledException;
 
 /**
- * Convenience implementation of checker that works on index-based AST of a C/C++
+ * Convenience implementation of checker that works on index-based AST of a
+ * C/C++
  * program.
  * 
  * Clients may extend this class.
@@ -50,7 +55,6 @@ public abstract class AbstractIndexAstChecker extends AbstractCheckerWithProblem
 			return false;
 		if (!(resource instanceof IFile))
 			return true;
-			
 		processFile((IFile) resource);
 		return false;
 	}
@@ -68,7 +72,6 @@ public abstract class AbstractIndexAstChecker extends AbstractCheckerWithProblem
 				context.add(modelCache);
 			}
 		}
-
 		try {
 			// Run the checker only if the index is fully initialized. Otherwise it may produce
 			// false positives.
@@ -87,8 +90,11 @@ public abstract class AbstractIndexAstChecker extends AbstractCheckerWithProblem
 		}
 	}
 
-	/* (non-Javadoc)
-	 * @see IRunnableInEditorChecker#processModel(Object, ICheckerInvocationContext)
+	/*
+	 * (non-Javadoc)
+	 * 
+	 * @see IRunnableInEditorChecker#processModel(Object,
+	 * ICheckerInvocationContext)
 	 */
 	@Override
 	public synchronized void processModel(Object model, ICheckerInvocationContext context) {
@@ -98,7 +104,6 @@ public abstract class AbstractIndexAstChecker extends AbstractCheckerWithProblem
 			// Otherwise the checker may produce false positives.
 			if (ast.isBasedOnIncompleteIndex())
 				return;
-
 			setContext(context);
 			synchronized (context) {
 				modelCache = context.get(CxxModelsCache.class);
@@ -110,7 +115,7 @@ public abstract class AbstractIndexAstChecker extends AbstractCheckerWithProblem
 			try {
 				processAst(ast);
 			} finally {
-				modelCache = null; 
+				modelCache = null;
 				setContext(null);
 			}
 		}
@@ -133,6 +138,49 @@ public abstract class AbstractIndexAstChecker extends AbstractCheckerWithProblem
 			reportProblem(problem, loc, args);
 	}
 
+	/**
+	 * Checks if problem should be reported, in this case it will check line
+	 * comments, later can add filters or what not.
+	 * 
+	 * @param problem - problem kind
+	 * @param loc - location
+	 * @param args - arguments
+	 * @since 3.4
+	 */
+	@Override
+	protected boolean shouldProduceProblem(IProblem problem, IProblemLocation loc, Object... args) {
+		String suppressionComment = (String) getSuppressionCommentPreference(problem).getValue();
+		if (suppressionComment.isEmpty())
+			return true;
+		List<IASTComment> lineComments = getLineCommentsForLocation(loc);
+		for (IASTComment astComment : lineComments) {
+			if (astComment.getRawSignature().contains(suppressionComment))
+				return false;
+		}
+		return true;
+	}
+
+	protected List<IASTComment> getLineCommentsForLocation(IProblemLocation loc) {
+		ArrayList<IASTComment> lineComments = new ArrayList<>();
+		try {
+			IASTComment[] commentsArray = modelCache.getAST().getComments();
+			for (IASTComment comm : commentsArray) {
+				IASTFileLocation fileLocation = comm.getFileLocation();
+				if (fileLocation.getStartingLineNumber() == loc.getLineNumber()) {
+					//XXX check on windows portable or os?
+					String problemFile = loc.getFile().getLocation().toPortableString();
+					String commentFile = fileLocation.getFileName();
+					if (problemFile.equals(commentFile)) {
+						lineComments.add(comm);
+					}
+				}
+			}
+		} catch (OperationCanceledException | CoreException e) {
+			Activator.log(e);
+		}
+		return lineComments;
+	}
+
 	protected IProblemLocation getProblemLocation(IASTNode astNode) {
 		IASTFileLocation astLocation = astNode.getFileLocation();
 		return getProblemLocation(astNode, astLocation);
diff --git a/codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/core/internal/checkers/AssignmentInConditionCheckerTest.java b/codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/core/internal/checkers/AssignmentInConditionCheckerTest.java
index 8b7be0ecb62..f3efc03bc2b 100644
--- a/codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/core/internal/checkers/AssignmentInConditionCheckerTest.java
+++ b/codan/org.eclipse.cdt.codan.core.test/src/org/eclipse/cdt/codan/core/internal/checkers/AssignmentInConditionCheckerTest.java
@@ -107,4 +107,44 @@ public class AssignmentInConditionCheckerTest extends CheckerTestCase {
 		String arg = CodanProblemMarker.getProblemArgument(marker, 0);
 		assertEquals("a=b", arg); //$NON-NLS-1$
 	}
+
+	//	main() {
+	//      int i;
+	//	    while (i=b()) { // @suppress("Assignment in condition")
+	//	    }
+	//	}
+	public void test_while2supp() {
+		loadCodeAndRun(getAboveComment());
+		checkNoErrors();
+	}
+
+	//	main() {
+	//      int i;
+	//	    while (i=b()) { /* @suppress("Assignment in condition") */
+	//	    }
+	//	}
+	public void test_while3supp() {
+		loadCodeAndRun(getAboveComment());
+		checkNoErrors();
+	}
+
+	//	#define LOOP() while (i=b() /* @suppress("Assignment in condition") */ ) {  }
+	//  main() {
+	//      int i;
+	//	    LOOP();
+	//	}
+	public void test_whileMacroSupp() {
+		loadCodeAndRun(getAboveComment());
+		checkErrorLine(4); // TODO: suppression does not work in macro body now
+	}
+
+	//	#define LOOP() while (i=b()) { }
+	//  main() {
+	//      int i;
+	//	    LOOP(); // err
+	//	}
+	public void test_whileMacro() {
+		loadCodeAndRun(getAboveComment());
+		checkErrorLine(4);
+	}
 }
diff --git a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/model/AbstractChecker.java b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/model/AbstractChecker.java
index 871611809bb..eaf81ce1a2e 100644
--- a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/model/AbstractChecker.java
+++ b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/model/AbstractChecker.java
@@ -50,7 +50,7 @@ public abstract class AbstractChecker implements IChecker {
 	 *        internationalization)
 	 */
 	public void reportProblem(String id, IFile file, int lineNumber, Object... args) {
-		getProblemReporter().reportProblem(id, createProblemLocation(file, lineNumber), args);
+		reportProblem(id, createProblemLocation(file, lineNumber), args);
 	}
 
 	/**
@@ -103,7 +103,7 @@ public abstract class AbstractChecker implements IChecker {
 	 *        - line
 	 */
 	public void reportProblem(String id, IFile file, int lineNumber) {
-		getProblemReporter().reportProblem(id, createProblemLocation(file, lineNumber), EMPTY_OBJECT_ARRAY);
+		reportProblem(id, createProblemLocation(file, lineNumber), EMPTY_OBJECT_ARRAY);
 	}
 
 	/**
diff --git a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/model/AbstractCheckerWithProblemPreferences.java b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/model/AbstractCheckerWithProblemPreferences.java
index c18a124ade3..7518bb52b3e 100644
--- a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/model/AbstractCheckerWithProblemPreferences.java
+++ b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/model/AbstractCheckerWithProblemPreferences.java
@@ -22,6 +22,7 @@ import org.eclipse.cdt.codan.core.param.LaunchModeProblemPreference;
 import org.eclipse.cdt.codan.core.param.ListProblemPreference;
 import org.eclipse.cdt.codan.core.param.MapProblemPreference;
 import org.eclipse.cdt.codan.core.param.RootProblemPreference;
+import org.eclipse.cdt.codan.core.param.SuppressionCommentProblemPreference;
 import org.eclipse.core.resources.IResource;
 import org.eclipse.core.runtime.IPath;
 
@@ -43,6 +44,7 @@ public abstract class AbstractCheckerWithProblemPreferences extends AbstractChec
 				CheckerLaunchMode.RUN_ON_DEMAND,
 				CheckerLaunchMode.RUN_ON_FULL_BUILD,
 				CheckerLaunchMode.RUN_ON_INC_BUILD);
+		getSuppressionCommentPreference(problem).setValue(SuppressionCommentProblemPreference.generateDefaultComment(problem));
 	}
 
 	/**
@@ -66,9 +68,18 @@ public abstract class AbstractCheckerWithProblemPreferences extends AbstractChec
 	}
 
 	/**
+	 * @param problem - problem for which preference is extracted
+	 * @return suppression comment preference
+	 * @since 4.0
+	 */
+	public SuppressionCommentProblemPreference getSuppressionCommentPreference(IProblem problem) {
+		return getTopLevelPreference(problem).getSuppressionCommentPreference();
+	}
+
+	/**
 	 * User can scope out some resources for this checker. Checker can use this
 	 * call to test if it should run on this resource at all or not. Test should
-	 * be done within processResource method not in enabledInContext.
+	 * be done within processResource method.
 	 * This test uses user "scope" preference for the all problems that this
 	 * checker can produce.
 	 *
@@ -109,10 +120,7 @@ public abstract class AbstractCheckerWithProblemPreferences extends AbstractChec
 
 	@Override
 	public void reportProblem(String problemId, IProblemLocation loc, Object... args) {
-		if (shouldProduceProblem(getProblemById(problemId, loc.getFile()),
-				loc.getFile().getFullPath())) {
-			super.reportProblem(problemId, loc, args);
-		}
+		reportProblem(getProblemById(problemId, loc.getFile()), loc, args);
 	}
 
 	/**
@@ -125,11 +133,26 @@ public abstract class AbstractCheckerWithProblemPreferences extends AbstractChec
 	 * @since 2.0
 	 */
 	public void reportProblem(IProblem pr, IProblemLocation loc, Object... args) {
-		if (shouldProduceProblem(pr, loc.getFile().getFullPath()))
+		if (shouldProduceProblem(pr, loc, args))
 			super.reportProblem(pr.getId(), loc, args);
 	}
 
 	/**
+	 * Checks if problem should be reported, this implementation only checks
+	 * suppression by scope, but subclass should override,
+	 * to implement any other filtering, such as suppression by filter or by comment.
+	 * Call super to check for scope suppression as well.
+	 *
+	 * @param problem - problem kind
+	 * @param loc - location
+	 * @param args - arguments
+	 * @since 4.0
+	 */
+	protected boolean shouldProduceProblem(IProblem problem, IProblemLocation loc, Object... args) {
+		return shouldProduceProblem(problem, loc.getFile().getFullPath());
+	}
+
+	/**
 	 * Adds a parameter
 	 *
 	 * @param problem
diff --git a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/param/Messages.java b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/param/Messages.java
index 4591d288546..bf8a1982f18 100644
--- a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/param/Messages.java
+++ b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/param/Messages.java
@@ -18,6 +18,7 @@ import org.eclipse.osgi.util.NLS;
  */
 class Messages extends NLS {
 	public static String FileScopeProblemPreference_Label;
+	public static String SuppressionCommentProblemPreference_Label;
 
 	static {
 		NLS.initializeMessages(Messages.class.getName(), Messages.class);
diff --git a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/param/Messages.properties b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/param/Messages.properties
index 04c64faf740..c6675dda2b5 100644
--- a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/param/Messages.properties
+++ b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/param/Messages.properties
@@ -10,3 +10,4 @@
 #	  IBM Corporation
 ###############################################################################
 FileScopeProblemPreference_Label=Exclusion and Inclusion
+SuppressionCommentProblemPreference_Label=Suppression Comment
diff --git a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/param/RootProblemPreference.java b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/param/RootProblemPreference.java
index 7dcf2965135..bab72b6ce74 100644
--- a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/param/RootProblemPreference.java
+++ b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/param/RootProblemPreference.java
@@ -10,7 +10,6 @@
  *******************************************************************************/
 package org.eclipse.cdt.codan.core.param;
 
-
 /**
  * Common problem preference root for most of the codan problems
  *
@@ -24,26 +23,34 @@ public class RootProblemPreference extends MapProblemPreference {
 	public static final String KEY = PARAM;
 
 	/**
-	 *  Default constructor
+	 * Default constructor
 	 */
 	public RootProblemPreference() {
 		super(KEY, ""); //$NON-NLS-1$
 		addChildDescriptor(new FileScopeProblemPreference());
 		addChildDescriptor(new LaunchModeProblemPreference());
+		addChildDescriptor(new SuppressionCommentProblemPreference());
 	}
 
 	/**
 	 * @return scope preference
 	 */
 	public FileScopeProblemPreference getScopePreference() {
-		return (FileScopeProblemPreference) getChildDescriptor(
-				FileScopeProblemPreference.KEY);
+		return (FileScopeProblemPreference) getChildDescriptor(FileScopeProblemPreference.KEY);
 	}
+
 	/**
-	 * @return launch mode
+	 * @return launch mode preference
 	 */
 	public LaunchModeProblemPreference getLaunchModePreference() {
 		return (LaunchModeProblemPreference) getChildDescriptor(LaunchModeProblemPreference.KEY);
+	}
 
+	/**
+	 * @return suppression comment preference
+	 * @since 4.0
+	 */
+	public SuppressionCommentProblemPreference getSuppressionCommentPreference() {
+		return (SuppressionCommentProblemPreference) getChildDescriptor(SuppressionCommentProblemPreference.KEY);
 	}
 }
diff --git a/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/param/SuppressionCommentProblemPreference.java b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/param/SuppressionCommentProblemPreference.java
new file mode 100644
index 00000000000..8506b974cdd
--- /dev/null
+++ b/codan/org.eclipse.cdt.codan.core/src/org/eclipse/cdt/codan/core/param/SuppressionCommentProblemPreference.java
@@ -0,0 +1,34 @@
+/*******************************************************************************
+ * Copyright (c) 2016 Alena Laskavaia
+ * 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:
+ *    Alena Laskavaia  - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.cdt.codan.core.param;
+
+import java.text.MessageFormat;
+
+import org.eclipse.cdt.codan.core.model.IProblemWorkingCopy;
+
+/**
+ * Preference for suppressing a problem using code comments. Automatically added to all problems.
+ * @since 4.0
+ */
+public class SuppressionCommentProblemPreference extends BasicProblemPreference implements IProblemPreference {
+	public static final String KEY = "suppression_comment"; //$NON-NLS-1$;
+	// Even if using English name it is really a keyword, so no externalizable.
+	public static final String KEYWORD = "@suppress(\"{0}\")"; //$NON-NLS-1$;
+
+	public SuppressionCommentProblemPreference() {
+		super(KEY, Messages.SuppressionCommentProblemPreference_Label, PreferenceType.TYPE_STRING);
+	}
+
+	public static String generateDefaultComment(IProblemWorkingCopy problem) {
+		String name = problem.getName();
+		return MessageFormat.format(KEYWORD, name);
+	}
+}