| /*=============================================================================# |
| # Copyright (c) 2007, 2020 Stephan Wahlbrink and others. |
| # |
| # This program and the accompanying materials are made available under the |
| # terms of the Eclipse Public License 2.0 which is available at |
| # https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0 |
| # which is available at https://www.apache.org/licenses/LICENSE-2.0. |
| # |
| # SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 |
| # |
| # Contributors: |
| # Stephan Wahlbrink <sw@wahlbrink.eu> - initial API and implementation |
| #=============================================================================*/ |
| |
| package org.eclipse.statet.ltk.ui.sourceediting; |
| |
| import org.eclipse.core.commands.AbstractHandler; |
| import org.eclipse.core.commands.ExecutionEvent; |
| import org.eclipse.core.commands.ExecutionException; |
| import org.eclipse.core.runtime.NullProgressMonitor; |
| import org.eclipse.jface.text.IRegion; |
| import org.eclipse.jface.text.ITextSelection; |
| import org.eclipse.jface.text.Region; |
| |
| import org.eclipse.statet.ltk.ast.core.AstInfo; |
| import org.eclipse.statet.ltk.ast.core.AstNode; |
| import org.eclipse.statet.ltk.ast.core.util.AstSelection; |
| import org.eclipse.statet.ltk.model.core.element.SourceUnit; |
| |
| |
| /** |
| * Command handler to expand the text selection according the AST. |
| */ |
| public abstract class StructureSelectHandler extends AbstractHandler { |
| |
| |
| public static class Enclosing extends StructureSelectHandler { |
| |
| public Enclosing(final ISourceEditor editor, final StructureSelectionHistory history) { |
| super(editor, history); |
| } |
| |
| @Override |
| IRegion concreteNewSelectionRange(final AstSelection selection) { |
| final AstNode covering= selection.getCovering(); |
| return createRegion(covering.getStartOffset(), covering.getEndOffset()); |
| } |
| |
| } |
| |
| public static class Next extends StructureSelectHandler { |
| |
| public Next(final ISourceEditor editor, final StructureSelectionHistory history) { |
| super(editor, history); |
| } |
| |
| @Override |
| IRegion concreteNewSelectionRange(final AstSelection selection) { |
| final AstNode covering= selection.getCovering(); |
| AstNode child= selection.getChildLastTouching(); |
| if (child == null || selection.getStopOffset() >= child.getEndOffset()) { |
| child= selection.getChildAfter(); |
| } |
| if (child != null) { |
| return createRegion(selection.getStartOffset(), child.getEndOffset()); |
| } |
| return createRegion(covering.getStartOffset(), covering.getEndOffset()); |
| } |
| |
| } |
| |
| public static class Previous extends StructureSelectHandler { |
| |
| public Previous(final ISourceEditor editor, final StructureSelectionHistory history) { |
| super(editor, history); |
| } |
| |
| @Override |
| IRegion concreteNewSelectionRange(final AstSelection selection) { |
| final AstNode covering= selection.getCovering(); |
| AstNode child= selection.getChildFirstTouching(); |
| if (child == null || selection.getStartOffset() <= child.getStartOffset()) { |
| child= selection.getChildBefore(); |
| } |
| if (child != null) { |
| return createRegion(selection.getStopOffset(), child.getStartOffset()); |
| } |
| return createRegion(covering.getEndOffset(), covering.getStartOffset()); |
| } |
| |
| } |
| |
| |
| private final ISourceEditor sourceEditor; |
| private final StructureSelectionHistory selectionHistory; |
| |
| |
| protected StructureSelectHandler(final ISourceEditor editor, final StructureSelectionHistory history) { |
| super(); |
| assert (editor != null); |
| assert (history != null); |
| this.sourceEditor= editor; |
| this.selectionHistory= history; |
| } |
| |
| |
| @Override |
| public Object execute(final ExecutionEvent event) throws ExecutionException { |
| final SourceUnit su= this.sourceEditor.getSourceUnit(); |
| if (su == null) { |
| return null; |
| } |
| final AstInfo astInfo= su.getAstInfo(null, true, new NullProgressMonitor()); |
| if (astInfo == null) { |
| return null; |
| } |
| |
| final ITextSelection selection= getTextSelection(); |
| final IRegion newRange= getNewSelectionRange(selection.getOffset(), selection.getOffset()+selection.getLength(), astInfo); |
| if (newRange != null) { |
| this.selectionHistory.remember(new Region(selection.getOffset(), selection.getLength())); |
| try { |
| this.selectionHistory.ignoreSelectionChanges(); |
| this.sourceEditor.selectAndReveal(newRange.getOffset(), newRange.getLength()); |
| } |
| finally { |
| this.selectionHistory.listenToSelectionChanges(); |
| } |
| } |
| return null; |
| } |
| |
| public final IRegion getNewSelectionRange(final int oldStart, final int oldStop, final AstInfo ast) { |
| final AstSelection selection= AstSelection.search(ast.getRoot(), |
| oldStart, oldStop, AstSelection.MODE_COVERING_GREATER ); |
| if (selection.getCovering() == null) { |
| return null; |
| } |
| return concreteNewSelectionRange(selection); |
| } |
| |
| /** |
| * Subclasses determine the actual new selection. |
| */ |
| abstract IRegion concreteNewSelectionRange(AstSelection selection); |
| |
| protected final ITextSelection getTextSelection() { |
| return (ITextSelection) this.sourceEditor.getViewer().getSelectionProvider().getSelection(); |
| } |
| |
| protected final IRegion createRegion(int start, final int stop) { |
| if (start < 0) { |
| start= 0; |
| } |
| return new Region(start, stop-start); |
| } |
| |
| } |