| /*=============================================================================# |
| # 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.r.ui.sourceediting; |
| |
| import org.eclipse.core.commands.AbstractHandler; |
| import org.eclipse.core.commands.ExecutionEvent; |
| import org.eclipse.core.commands.ExecutionException; |
| import org.eclipse.jface.text.BadLocationException; |
| import org.eclipse.jface.text.IDocument; |
| import org.eclipse.jface.text.ITextSelection; |
| import org.eclipse.jface.text.source.ISourceViewer; |
| |
| import org.eclipse.statet.jcommons.lang.NonNullByDefault; |
| import org.eclipse.statet.jcommons.lang.Nullable; |
| |
| import org.eclipse.statet.internal.r.ui.RUIPlugin; |
| import org.eclipse.statet.ltk.model.core.elements.ISourceUnit; |
| import org.eclipse.statet.ltk.ui.sourceediting.ISourceEditor; |
| import org.eclipse.statet.r.core.IRCoreAccess; |
| import org.eclipse.statet.r.core.RCodeStyleSettings; |
| import org.eclipse.statet.r.core.RCore; |
| import org.eclipse.statet.r.core.model.IRSourceUnit; |
| import org.eclipse.statet.r.core.rlang.RTokens; |
| |
| |
| /** |
| * Inserts the R assignment <- |
| */ |
| @NonNullByDefault |
| public class InsertAssignmentHandler extends AbstractHandler { |
| |
| |
| private final ISourceEditor editor; |
| |
| |
| public InsertAssignmentHandler(final ISourceEditor editor) { |
| this.editor= editor; |
| } |
| |
| |
| @Override |
| public void setEnabled(final @Nullable Object evaluationContext) { |
| setBaseEnabled(this.editor.isEditable(false)); |
| } |
| |
| @Override |
| public @Nullable Object execute(final ExecutionEvent event) throws ExecutionException { |
| if (this.editor.isEditable(true)) { |
| insertSequence(); |
| } |
| return null; |
| } |
| |
| private RCodeStyleSettings getCodeStyle() { |
| final ISourceUnit sourceUnit= this.editor.getSourceUnit(); |
| final IRCoreAccess coreAccess= (sourceUnit instanceof IRSourceUnit) ? |
| ((IRSourceUnit) sourceUnit).getRCoreAccess() : RCore.getWorkbenchAccess(); |
| return coreAccess.getRCodeStyle(); |
| } |
| |
| /** |
| * Inserts the assignment char sequence. |
| */ |
| private void insertSequence() { |
| final ISourceViewer sourceViewer= this.editor.getViewer(); |
| final IDocument document= sourceViewer.getDocument(); |
| final ITextSelection selection= (ITextSelection) sourceViewer.getSelectionProvider().getSelection(); |
| final int offset= selection.getOffset(); |
| final int selectionLength= selection.getLength(); |
| |
| final StringBuilder sequence= new StringBuilder("<-"); //$NON-NLS-1$ |
| try { |
| final RCodeStyleSettings codeStyle= getCodeStyle(); |
| if ((offset == 0 || !RTokens.isWhitespace(document.getChar(offset - 1))) |
| && codeStyle.getWhitespaceAssignBefore() ) { |
| sequence.insert(0, ' '); |
| } |
| if (codeStyle.getWhitespaceAssignAfter()) { |
| sequence.append(' '); |
| } |
| document.replace(offset, selectionLength, sequence.toString()); |
| } |
| catch (final BadLocationException e) { |
| RUIPlugin.logError(RUIPlugin.INTERNAL_ERROR, "An error occurred while inserting assignment.", e); //$NON-NLS-1$ |
| } |
| final int targetOffset= offset + sequence.length(); |
| |
| sourceViewer.setSelectedRange(targetOffset, 0); |
| sourceViewer.revealRange(targetOffset, 0); |
| } |
| |
| } |