jump to definition on break/continue

org.eclipse.jdt.ls.core/src/org/eclipse/jdt/ls/core/internal/handlers/NavigateToDefinitionHandler.java

@@ -15,6 +15,7 @@
 import java.util.List;
 
 import org.apache.commons.lang3.StringUtils;
+import org.eclipse.core.runtime.CoreException;
 import org.eclipse.core.runtime.IProgressMonitor;
 import org.eclipse.jdt.core.IClassFile;
 import org.eclipse.jdt.core.ICompilationUnit;
@@ -24,6 +25,23 @@
 import org.eclipse.jdt.core.ITypeRoot;
 import org.eclipse.jdt.core.JavaCore;
 import org.eclipse.jdt.core.JavaModelException;
+import org.eclipse.jdt.core.dom.ASTNode;
+import org.eclipse.jdt.core.dom.BreakStatement;
+import org.eclipse.jdt.core.dom.CompilationUnit;
+import org.eclipse.jdt.core.dom.ContinueStatement;
+import org.eclipse.jdt.core.dom.DoStatement;
+import org.eclipse.jdt.core.dom.EnhancedForStatement;
+import org.eclipse.jdt.core.dom.ForStatement;
+import org.eclipse.jdt.core.dom.Initializer;
+import org.eclipse.jdt.core.dom.LabeledStatement;
+import org.eclipse.jdt.core.dom.MethodDeclaration;
+import org.eclipse.jdt.core.dom.NodeFinder;
+import org.eclipse.jdt.core.dom.SimpleName;
+import org.eclipse.jdt.core.dom.SwitchExpression;
+import org.eclipse.jdt.core.dom.SwitchStatement;
+import org.eclipse.jdt.core.dom.WhileStatement;
+import org.eclipse.jdt.core.manipulation.SharedASTProviderCore;
+import org.eclipse.jdt.internal.corext.dom.TokenScanner;
 import org.eclipse.jdt.ls.core.internal.JDTUtils;
 import org.eclipse.jdt.ls.core.internal.JavaLanguageServerPlugin;
 import org.eclipse.jdt.ls.core.internal.managers.ProjectsManager;
@@ -52,14 +70,83 @@ public List<? extends Location> definition(TextDocumentPositionParams position,
 	private Location computeDefinitionNavigation(ITypeRoot unit, int line, int column, IProgressMonitor monitor) {
 		try {
 			IJavaElement element = JDTUtils.findElementAtSelection(unit, line, column, this.preferenceManager, monitor);
+			if (element == null) {
+				return computeBreakContinue(unit, line, column);
+			}
 			return computeDefinitionNavigation(element, unit.getJavaProject());
-		} catch (JavaModelException e) {
+		} catch (CoreException e) {
 			JavaLanguageServerPlugin.logException("Problem computing definition for" + unit.getElementName(), e);
 		}
 
 		return null;
 	}
 
+	private Location computeBreakContinue(ITypeRoot typeRoot, int line, int column) throws CoreException {
+		int offset = JsonRpcHelpers.toOffset(typeRoot.getBuffer(), line, column);
+		if (offset >= 0) {
+			CompilationUnit unit = SharedASTProviderCore.getAST(typeRoot, SharedASTProviderCore.WAIT_YES, null);
+			if (unit == null) {
+				return null;
+			}
+			ASTNode selectedNode = NodeFinder.perform(unit, offset, 0);
+			ASTNode node = null;
+			SimpleName label = null;
+			if (selectedNode instanceof BreakStatement) {
+				node = selectedNode;
+				label = ((BreakStatement) node).getLabel();
+			} else if (selectedNode instanceof ContinueStatement) {
+				node = selectedNode;
+				label = ((ContinueStatement) node).getLabel();
+			} else if (selectedNode instanceof SimpleName && selectedNode.getParent() instanceof BreakStatement) {
+				node = selectedNode.getParent();
+				label = ((BreakStatement) node).getLabel();
+			} else if (selectedNode instanceof SimpleName && selectedNode.getParent() instanceof ContinueStatement) {
+				node = selectedNode.getParent();
+				label = ((ContinueStatement) node).getLabel();
+			}
+			if (node != null) {
+				ASTNode parent = node.getParent();
+				ASTNode target = null;
+				while (parent != null) {
+					if (parent instanceof MethodDeclaration || parent instanceof Initializer) {
+						break;
+					}
+					if (label == null) {
+						if (parent instanceof ForStatement || parent instanceof EnhancedForStatement || parent instanceof WhileStatement || parent instanceof DoStatement) {
+							target = parent;
+							break;
+						}
+						if (node instanceof BreakStatement) {
+							if (parent instanceof SwitchStatement || parent instanceof SwitchExpression) {
+								target = parent;
+								break;
+							}
+						}
+						if (node instanceof LabeledStatement) {
+							target = parent;
+							break;
+						}
+					} else if (LabeledStatement.class.isInstance(parent)) {
+						LabeledStatement ls = (LabeledStatement) parent;
+						if (ls.getLabel().getIdentifier().equals(label.getIdentifier())) {
+							target = ls;
+							break;
+						}
+					}
+					parent = parent.getParent();
+				}
+				if (target != null) {
+					int start = target.getStartPosition();
+					int end = new TokenScanner(unit.getTypeRoot()).getNextEndOffset(node.getStartPosition(), true) - start;
+					if (start >= 0 && end >= 0) {
+						return JDTUtils.toLocation((ICompilationUnit) typeRoot, start, end);
+					}
+				}
+			}
+		}
+		return null;
+	}
+
 	public static Location computeDefinitionNavigation(IJavaElement element, IJavaProject javaProject) throws JavaModelException {
 		if (element == null) {
 			return null;

org.eclipse.jdt.ls.tests/projects/maven/salut/src/main/java/org/sample/TestBreakContinue.java

@@ -0,0 +1,26 @@
+package org.sample;
+
+public class TestBreakContinue {
+
+	public static void main(String[] args) {
+		int i = 0;
+		outer: while (true) {
+			System.out.println(i);
+			while (true) {
+				i++;
+				if (i == 1) {
+					continue; // inner
+				}
+				if (i == 3) {
+					continue outer;
+				}
+				if (i == 5) {
+					break; //inner
+				}
+				if (i == 7) {
+					break outer;
+				}
+			}
+		}
+	}
+}

org.eclipse.jdt.ls.tests/src/org/eclipse/jdt/ls/core/internal/handlers/NavigateToDefinitionHandlerTest.java

@@ -85,6 +85,40 @@ public void testJdkClasses() throws Exception {
 		testClass("org.apache.commons.lang3.stringutils", 6579, 20);
 	}
 
+	@Test
+	public void testBreakContinue() throws JavaModelException {
+		String uri = ClassFileUtil.getURI(project, "org.sample.TestBreakContinue");
+		TextDocumentIdentifier identifier = new TextDocumentIdentifier(uri);
+		// continue
+		List<? extends Location> definitions = handler.definition(new TextDocumentPositionParams(identifier, new Position(11, 5)), monitor);
+		assertNotNull(definitions);
+		assertEquals(1, definitions.size());
+		Location definition = definitions.get(0);
+		assertEquals(8, definition.getRange().getStart().getLine());
+		assertEquals(3, definition.getRange().getStart().getCharacter());
+		// outer continue
+		definitions = handler.definition(new TextDocumentPositionParams(identifier, new Position(14, 5)), monitor);
+		assertNotNull(definitions);
+		assertEquals(1, definitions.size());
+		definition = definitions.get(0);
+		assertEquals(6, definition.getRange().getStart().getLine());
+		assertEquals(2, definition.getRange().getStart().getCharacter());
+		// break
+		definitions = handler.definition(new TextDocumentPositionParams(identifier, new Position(17, 5)), monitor);
+		assertNotNull(definitions);
+		assertEquals(1, definitions.size());
+		definition = definitions.get(0);
+		assertEquals(8, definition.getRange().getStart().getLine());
+		assertEquals(3, definition.getRange().getStart().getCharacter());
+		// outer break
+		definitions = handler.definition(new TextDocumentPositionParams(identifier, new Position(20, 5)), monitor);
+		assertNotNull(definitions);
+		assertEquals(1, definitions.size());
+		definition = definitions.get(0);
+		assertEquals(6, definition.getRange().getStart().getLine());
+		assertEquals(2, definition.getRange().getStart().getCharacter());
+	}
+
 	private void testClass(String className, int line, int column) throws JavaModelException {
 		String uri = ClassFileUtil.getURI(project, className);
 		TextDocumentIdentifier identifier = new TextDocumentIdentifier(uri);