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/*******************************************************************************
* Copyright (c) 2015 protos software gmbh (http://www.protos.de).
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* CONTRIBUTORS:
* https://borisdevnotes.wordpress.com/2014/02/28/xtext-usability-hovers-on-keywords/
* Juergen Haug (initial contribution)
*
*******************************************************************************/
package org.eclipse.etrice.core.common.ui.hover;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.jface.text.IRegion;
import org.eclipse.jface.text.ITextViewer;
import org.eclipse.jface.text.Region;
import org.eclipse.xtext.Keyword;
import org.eclipse.xtext.nodemodel.ILeafNode;
import org.eclipse.xtext.nodemodel.util.NodeModelUtils;
import org.eclipse.xtext.parser.IParseResult;
import org.eclipse.xtext.resource.XtextResource;
import org.eclipse.xtext.ui.editor.hover.DispatchingEObjectTextHover;
import org.eclipse.xtext.ui.editor.hover.IEObjectHoverProvider;
import org.eclipse.xtext.util.Pair;
import org.eclipse.xtext.util.Tuples;
import com.google.inject.Inject;
public class KeywordEObjectTextHover extends DispatchingEObjectTextHover {
@Inject
protected IEObjectHoverProvider hoverProvider;
@Override
public Object getHoverInfo(EObject first, ITextViewer textViewer, IRegion hoverRegion) {
if (first instanceof Keyword) {
lastCreatorProvider = hoverProvider.getHoverInfo(first, textViewer, hoverRegion);
return lastCreatorProvider == null ? null : lastCreatorProvider.getInfo();
}
lastCreatorProvider = null;
return super.getHoverInfo(first, textViewer, hoverRegion);
}
@Override
protected Pair<EObject, IRegion> getXtextElementAt(XtextResource resource, int offset) {
Pair<EObject, IRegion> result = resolveKeywordAt(resource, offset);
if (result == null)
result = super.getXtextElementAt(resource, offset);
return result;
}
public Pair<EObject, IRegion> resolveKeywordAt(XtextResource resource, int offset) {
IParseResult parseResult = resource.getParseResult();
if (parseResult != null) {
ILeafNode leaf = NodeModelUtils.findLeafNodeAtOffset(parseResult.getRootNode(), offset);
if (leaf != null && leaf.isHidden() && leaf.getOffset() == offset) {
leaf = NodeModelUtils.findLeafNodeAtOffset(parseResult.getRootNode(), offset - 1);
}
if (leaf != null && leaf.getGrammarElement() instanceof Keyword) {
Keyword keyword = (Keyword) leaf.getGrammarElement();
return Tuples.create((EObject) keyword, (IRegion) new Region(leaf.getOffset(), leaf.getLength()));
}
}
return null;
}
}
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