/projects/eclipse_SDK-3.7.1/plugins/org.eclipse.jdt.ui.source_3.7.1.r371_v20110824-0800/org/eclipse/jdt/internal/corext/refactoring/util/StatementAnalyzer.java
Java | 277 lines | 211 code | 26 blank | 40 comment | 65 complexity | e4e84e53c10baf0385295310eaa804b3 MD5 | raw file
- /*******************************************************************************
- * Copyright (c) 2000, 2011 IBM Corporation 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:
- * IBM Corporation - initial API and implementation
- *******************************************************************************/
- package org.eclipse.jdt.internal.corext.refactoring.util;
- import java.util.ArrayList;
- import java.util.Iterator;
- import java.util.List;
- import org.eclipse.core.runtime.Assert;
- import org.eclipse.core.runtime.CoreException;
- import org.eclipse.ltk.core.refactoring.RefactoringStatus;
- import org.eclipse.ltk.core.refactoring.RefactoringStatusContext;
- import org.eclipse.jdt.core.ICompilationUnit;
- import org.eclipse.jdt.core.ISourceRange;
- import org.eclipse.jdt.core.SourceRange;
- import org.eclipse.jdt.core.compiler.IScanner;
- import org.eclipse.jdt.core.dom.ASTNode;
- import org.eclipse.jdt.core.dom.CatchClause;
- import org.eclipse.jdt.core.dom.CompilationUnit;
- import org.eclipse.jdt.core.dom.DoStatement;
- import org.eclipse.jdt.core.dom.Expression;
- import org.eclipse.jdt.core.dom.ForStatement;
- import org.eclipse.jdt.core.dom.Statement;
- import org.eclipse.jdt.core.dom.SwitchCase;
- import org.eclipse.jdt.core.dom.SwitchStatement;
- import org.eclipse.jdt.core.dom.SynchronizedStatement;
- import org.eclipse.jdt.core.dom.TryStatement;
- import org.eclipse.jdt.core.dom.WhileStatement;
- import org.eclipse.jdt.internal.corext.dom.ASTNodes;
- import org.eclipse.jdt.internal.corext.dom.Selection;
- import org.eclipse.jdt.internal.corext.dom.SelectionAnalyzer;
- import org.eclipse.jdt.internal.corext.dom.TokenScanner;
- import org.eclipse.jdt.internal.corext.refactoring.RefactoringCoreMessages;
- import org.eclipse.jdt.internal.corext.refactoring.base.JavaStatusContext;
- /**
- * Analyzer to check if a selection covers a valid set of statements of an abstract syntax
- * tree. The selection is valid iff
- * <ul>
- * <li>it does not start or end in the middle of a comment.</li>
- * <li>no extract characters except the empty statement ";" is included in the selection.</li>
- * </ul>
- */
- public class StatementAnalyzer extends SelectionAnalyzer {
- protected ICompilationUnit fCUnit;
- private TokenScanner fScanner;
- private RefactoringStatus fStatus;
- public StatementAnalyzer(ICompilationUnit cunit, Selection selection, boolean traverseSelectedNode) throws CoreException {
- super(selection, traverseSelectedNode);
- Assert.isNotNull(cunit);
- fCUnit= cunit;
- fStatus= new RefactoringStatus();
- fScanner= new TokenScanner(fCUnit);
- }
- protected void checkSelectedNodes() {
- ASTNode[] nodes= getSelectedNodes();
- if (nodes.length == 0)
- return;
- ASTNode node= nodes[0];
- int selectionOffset= getSelection().getOffset();
- try {
- int start= fScanner.getNextStartOffset(selectionOffset, true);
- if (start == node.getStartPosition()) {
- int lastNodeEnd= ASTNodes.getExclusiveEnd(nodes[nodes.length - 1]);
- int pos= fScanner.getNextStartOffset(lastNodeEnd, true);
- int selectionEnd= getSelection().getInclusiveEnd();
- if (pos <= selectionEnd) {
- IScanner scanner= fScanner.getScanner();
- char[] token= scanner.getCurrentTokenSource(); //see https://bugs.eclipse.org/324237
- if (start < lastNodeEnd && token.length == 1 && (token[0] == ';' || token[0] == ',')) {
- setSelection(Selection.createFromStartEnd(start, lastNodeEnd - 1));
- } else {
- ISourceRange range= new SourceRange(lastNodeEnd, pos - lastNodeEnd);
- invalidSelection(RefactoringCoreMessages.StatementAnalyzer_end_of_selection, JavaStatusContext.create(fCUnit, range));
- }
- }
- return; // success
- }
- } catch (CoreException e) {
- // fall through
- }
- ISourceRange range= new SourceRange(selectionOffset, node.getStartPosition() - selectionOffset + 1);
- invalidSelection(RefactoringCoreMessages.StatementAnalyzer_beginning_of_selection, JavaStatusContext.create(fCUnit, range));
- }
- public RefactoringStatus getStatus() {
- return fStatus;
- }
- protected ICompilationUnit getCompilationUnit() {
- return fCUnit;
- }
- protected TokenScanner getTokenScanner() {
- return fScanner;
- }
- /* (non-Javadoc)
- * Method declared in ASTVisitor
- */
- @Override
- public void endVisit(CompilationUnit node) {
- if (!hasSelectedNodes()) {
- super.endVisit(node);
- return;
- }
- ASTNode selectedNode= getFirstSelectedNode();
- Selection selection= getSelection();
- if (node != selectedNode) {
- ASTNode parent= selectedNode.getParent();
- fStatus.merge(CommentAnalyzer.perform(selection, fScanner.getScanner(), parent.getStartPosition(), parent.getLength()));
- }
- if (!fStatus.hasFatalError())
- checkSelectedNodes();
- super.endVisit(node);
- }
- /* (non-Javadoc)
- * Method declared in ASTVisitor
- */
- @Override
- public void endVisit(DoStatement node) {
- ASTNode[] selectedNodes= getSelectedNodes();
- if (doAfterValidation(node, selectedNodes)) {
- if (contains(selectedNodes, node.getBody()) && contains(selectedNodes, node.getExpression())) {
- invalidSelection(RefactoringCoreMessages.StatementAnalyzer_do_body_expression);
- }
- }
- super.endVisit(node);
- }
- /* (non-Javadoc)
- * Method declared in ASTVisitor
- */
- @Override
- public void endVisit(ForStatement node) {
- ASTNode[] selectedNodes= getSelectedNodes();
- if (doAfterValidation(node, selectedNodes)) {
- boolean containsExpression= contains(selectedNodes, node.getExpression());
- boolean containsUpdaters= contains(selectedNodes, node.updaters());
- if (contains(selectedNodes, node.initializers()) && containsExpression) {
- invalidSelection(RefactoringCoreMessages.StatementAnalyzer_for_initializer_expression);
- } else if (containsExpression && containsUpdaters) {
- invalidSelection(RefactoringCoreMessages.StatementAnalyzer_for_expression_updater);
- } else if (containsUpdaters && contains(selectedNodes, node.getBody())) {
- invalidSelection(RefactoringCoreMessages.StatementAnalyzer_for_updater_body);
- }
- }
- super.endVisit(node);
- }
- /* (non-Javadoc)
- * Method declared in ASTVisitor
- */
- @Override
- public void endVisit(SwitchStatement node) {
- ASTNode[] selectedNodes= getSelectedNodes();
- if (doAfterValidation(node, selectedNodes)) {
- List<SwitchCase> cases= getSwitchCases(node);
- for (int i= 0; i < selectedNodes.length; i++) {
- ASTNode topNode= selectedNodes[i];
- if (cases.contains(topNode)) {
- invalidSelection(RefactoringCoreMessages.StatementAnalyzer_switch_statement);
- break;
- }
- }
- }
- super.endVisit(node);
- }
- /* (non-Javadoc)
- * Method declared in ASTVisitor
- */
- @Override
- public void endVisit(SynchronizedStatement node) {
- ASTNode firstSelectedNode= getFirstSelectedNode();
- if (getSelection().getEndVisitSelectionMode(node) == Selection.SELECTED) {
- if (firstSelectedNode == node.getBody()) {
- invalidSelection(RefactoringCoreMessages.StatementAnalyzer_synchronized_statement);
- }
- }
- super.endVisit(node);
- }
- /* (non-Javadoc)
- * Method declared in ASTVisitor
- */
- @Override
- public void endVisit(TryStatement node) {
- ASTNode firstSelectedNode= getFirstSelectedNode();
- if (getSelection().getEndVisitSelectionMode(node) == Selection.AFTER) {
- if (firstSelectedNode == node.getBody() || firstSelectedNode == node.getFinally()) {
- invalidSelection(RefactoringCoreMessages.StatementAnalyzer_try_statement);
- } else {
- List<CatchClause> catchClauses= node.catchClauses();
- for (Iterator<CatchClause> iterator= catchClauses.iterator(); iterator.hasNext();) {
- CatchClause element= iterator.next();
- if (element == firstSelectedNode || element.getBody() == firstSelectedNode) {
- invalidSelection(RefactoringCoreMessages.StatementAnalyzer_try_statement);
- } else if (element.getException() == firstSelectedNode) {
- invalidSelection(RefactoringCoreMessages.StatementAnalyzer_catch_argument);
- }
- }
- }
- }
- super.endVisit(node);
- }
- /* (non-Javadoc)
- * Method declared in ASTVisitor
- */
- @Override
- public void endVisit(WhileStatement node) {
- ASTNode[] selectedNodes= getSelectedNodes();
- if (doAfterValidation(node, selectedNodes)) {
- if (contains(selectedNodes, node.getExpression()) && contains(selectedNodes, node.getBody())) {
- invalidSelection(RefactoringCoreMessages.StatementAnalyzer_while_expression_body);
- }
- }
- super.endVisit(node);
- }
- private boolean doAfterValidation(ASTNode node, ASTNode[] selectedNodes) {
- return selectedNodes.length > 0 && node == selectedNodes[0].getParent() && getSelection().getEndVisitSelectionMode(node) == Selection.AFTER;
- }
- protected void invalidSelection(String message) {
- fStatus.addFatalError(message);
- reset();
- }
- protected void invalidSelection(String message, RefactoringStatusContext context) {
- fStatus.addFatalError(message, context);
- reset();
- }
- private static List<SwitchCase> getSwitchCases(SwitchStatement node) {
- List<SwitchCase> result= new ArrayList<SwitchCase>();
- for (Iterator<Statement> iter= node.statements().iterator(); iter.hasNext(); ) {
- Object element= iter.next();
- if (element instanceof SwitchCase)
- result.add((SwitchCase) element);
- }
- return result;
- }
- protected static boolean contains(ASTNode[] nodes, ASTNode node) {
- for (int i = 0; i < nodes.length; i++) {
- if (nodes[i] == node)
- return true;
- }
- return false;
- }
- protected static boolean contains(ASTNode[] nodes, List<Expression> list) {
- for (int i = 0; i < nodes.length; i++) {
- if (list.contains(nodes[i]))
- return true;
- }
- return false;
- }
- }