| /******************************************************************************* |
| * Copyright (c) 2007 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.debug.ui.actions; |
| |
| import org.eclipse.jdt.core.ICodeAssist; |
| import org.eclipse.jdt.core.IJavaElement; |
| import org.eclipse.jdt.core.IMethod; |
| import org.eclipse.jdt.core.JavaCore; |
| import org.eclipse.jdt.core.JavaModelException; |
| import org.eclipse.jdt.core.ToolFactory; |
| import org.eclipse.jdt.core.compiler.IScanner; |
| import org.eclipse.jdt.core.compiler.ITerminalSymbols; |
| import org.eclipse.jdt.core.compiler.InvalidInputException; |
| import org.eclipse.jdt.ui.JavaUI; |
| import org.eclipse.jface.text.BadLocationException; |
| import org.eclipse.jface.text.IDocument; |
| import org.eclipse.jface.text.IRegion; |
| import org.eclipse.jface.text.ITextSelection; |
| import org.eclipse.ui.IEditorInput; |
| import org.eclipse.ui.IEditorPart; |
| import org.eclipse.ui.texteditor.IDocumentProvider; |
| import org.eclipse.ui.texteditor.ITextEditor; |
| |
| /** |
| * Utility class for aiding step into selection actions and hyper-linking |
| * |
| * @see StepIntoSelectionActionDelegate |
| * @see StepIntoSelectionHyperlinkDetector |
| * |
| * @since 3.3 |
| */ |
| public class StepIntoSelectionUtils { |
| |
| |
| /** |
| * gets the <code>IJavaElement</code> from the editor input |
| * @param input the current editor input |
| * @return the corresponding <code>IJavaElement</code> |
| */ |
| public static IJavaElement getJavaElement(IEditorInput input) { |
| IJavaElement je = JavaUI.getEditorInputJavaElement(input); |
| if(je != null) { |
| return je; |
| } |
| return JavaUI.getWorkingCopyManager().getWorkingCopy(input); |
| } |
| |
| /** |
| * Returns the <code>IMethod</code> from the given selection within the given <code>IJavaElement</code>, |
| * or <code>null</code> if the selection does not container or is not an <code>IMethod</code> |
| * @param selection |
| * @param element |
| * @return the corresponding <code>IMethod</code> from the selection within the provided <code>IJavaElement</code> |
| * @throws JavaModelException |
| */ |
| public static IMethod getMethod(ITextSelection selection, IJavaElement element) throws JavaModelException { |
| if(element != null && element instanceof ICodeAssist) { |
| return resolveMethod(selection.getOffset(), selection.getLength(), (ICodeAssist)element); |
| } |
| return null; |
| } |
| |
| /** |
| * @param offset selection offset |
| * @param length selection length |
| * @param codeAssist context |
| * @return the method at the given position, or <code>null</code> if no method could be resolved |
| * @throws JavaModelException |
| */ |
| private static IMethod resolveMethod(int offset, int length, ICodeAssist codeAssist) throws JavaModelException { |
| IJavaElement[] elements = codeAssist.codeSelect(offset, length); |
| for (int i = 0; i < elements.length; i++) { |
| if (elements[i] instanceof IMethod) { |
| return (IMethod)elements[i]; |
| } |
| } |
| return null; |
| } |
| |
| /** |
| * @param offset |
| * @param activeEditor |
| * @param element |
| * @return the first method found at or after <code>offset</code> on the same line |
| * @throws JavaModelException |
| */ |
| public static IMethod getFirstMethodOnLine(int offset, IEditorPart activeEditor, IJavaElement element) throws JavaModelException { |
| if (! (activeEditor instanceof ITextEditor) || ! (element instanceof ICodeAssist)) { |
| return null; |
| } |
| ITextEditor editor = (ITextEditor)activeEditor; |
| IDocumentProvider documentProvider = editor.getDocumentProvider(); |
| if (documentProvider == null) { |
| return null; |
| } |
| IDocument document = documentProvider.getDocument(editor.getEditorInput()); |
| if (document == null) { |
| return null; |
| } |
| try { |
| IRegion lineInfo = document.getLineInformationOfOffset(offset); |
| String line = document.get(lineInfo.getOffset(), lineInfo.getLength()); |
| IScanner scanner = ToolFactory.createScanner(false, false, false, null, JavaCore.VERSION_1_5); |
| scanner.setSource(line.toCharArray()); |
| scanner.resetTo(offset - lineInfo.getOffset(), lineInfo.getLength()); |
| int token = scanner.getNextToken(); |
| while (token != ITerminalSymbols.TokenNameEOF) { |
| if (token == ITerminalSymbols.TokenNameIdentifier) { |
| int methodStart = scanner.getCurrentTokenStartPosition(); |
| token = scanner.getNextToken(); |
| if (token == ITerminalSymbols.TokenNameLPAREN) { |
| return resolveMethod(lineInfo.getOffset() + methodStart, 0, (ICodeAssist)element); |
| } |
| } |
| else { |
| token = scanner.getNextToken(); |
| } |
| } |
| } |
| catch (BadLocationException e) { |
| return null; |
| } |
| catch (InvalidInputException e) { |
| return null; |
| } |
| return null; |
| } |
| |
| } |