NonRuleBasedDamagerRepairer.java

/*
 * DBeaver - Universal Database Manager
 * Copyright (C) 2010-2017 Serge Rider (serge@jkiss.org)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.jkiss.dbeaver.ui.editors.xml;

import org.jkiss.dbeaver.Log;
import org.eclipse.jface.text.*;
import org.eclipse.jface.text.presentation.IPresentationDamager;
import org.eclipse.jface.text.presentation.IPresentationRepairer;
import org.eclipse.swt.custom.StyleRange;

public class NonRuleBasedDamagerRepairer implements IPresentationDamager, IPresentationRepairer {

    private static final Log log = Log.getLog(NonRuleBasedDamagerRepairer.class);

	/** The document this object works on */
	protected IDocument fDocument;
	/** The default text attribute if non is returned as data by the current token */
	protected TextAttribute fDefaultTextAttribute;
	
	public NonRuleBasedDamagerRepairer(TextAttribute defaultTextAttribute) {
		fDefaultTextAttribute = defaultTextAttribute;
	}

	/**
	 * @see IPresentationRepairer#setDocument(IDocument)
	 */
	@Override
    public void setDocument(IDocument document) {
		fDocument = document;
	}

	/**
	 * Returns the end offset of the line that contains the specified offset or
	 * if the offset is inside a line delimiter, the end offset of the next line.
	 *
	 * @param offset the offset whose line end offset must be computed
	 * @return the line end offset for the given offset
	 * @exception BadLocationException if offset is invalid in the current document
	 */
	protected int endOfLineOf(int offset) throws BadLocationException {

		IRegion info = fDocument.getLineInformationOfOffset(offset);
		if (offset <= info.getOffset() + info.getLength())
			return info.getOffset() + info.getLength();

		int line = fDocument.getLineOfOffset(offset);
		try {
			info = fDocument.getLineInformation(line + 1);
			return info.getOffset() + info.getLength();
		} catch (BadLocationException x) {
			return fDocument.getLength();
		}
	}

	/**
	 * @see IPresentationDamager#getDamageRegion(ITypedRegion, DocumentEvent, boolean)
	 */
	@Override
    public IRegion getDamageRegion(
		ITypedRegion partition,
		DocumentEvent event,
		boolean documentPartitioningChanged) {
		if (!documentPartitioningChanged) {
			try {

				IRegion info =
					fDocument.getLineInformationOfOffset(event.getOffset());
				int start = Math.max(partition.getOffset(), info.getOffset());

				int end =
					event.getOffset()
						+ (event.getText() == null
							? event.getLength()
							: event.getText().length());

				if (info.getOffset() <= end
					&& end <= info.getOffset() + info.getLength()) {
					// optimize the case of the same line
					end = info.getOffset() + info.getLength();
				} else
					end = endOfLineOf(end);

				end =
					Math.min(
						partition.getOffset() + partition.getLength(),
						end);
				return new Region(start, end - start);

			} catch (BadLocationException e) {
                log.debug(e);
			}
		}

		return partition;
	}

	/**
	 * @see IPresentationRepairer#createPresentation(TextPresentation, ITypedRegion)
	 */
	@Override
    public void createPresentation(
		TextPresentation presentation,
		ITypedRegion region) {
		addRange(
			presentation,
			region.getOffset(),
			region.getLength(),
			fDefaultTextAttribute);
	}

	/**
	 * Adds style information to the given text presentation.
	 *
	 * @param presentation the text presentation to be extended
	 * @param offset the offset of the range to be styled
	 * @param length the length of the range to be styled
	 * @param attr the attribute describing the style of the range to be styled
	 */
	protected void addRange(
		TextPresentation presentation,
		int offset,
		int length,
		TextAttribute attr) {
		if (attr != null)
			presentation.addStyleRange(
				new StyleRange(
					offset,
					length,
					attr.getForeground(),
					attr.getBackground(),
					attr.getStyle()));
	}
}