org.jnario.xbase.richstring.util.TextLines.java Source code

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Here is the source code for org.jnario.xbase.richstring.util.TextLines.java

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/*******************************************************************************
 * Copyright (c) 2011 itemis AG (http://www.itemis.eu) 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
 *******************************************************************************/
package org.jnario.xbase.richstring.util;

import java.util.Collections;
import java.util.List;

import com.google.common.collect.Lists;

/**
 * @author Sebastian Zarnekow - Initial contribution and API
 */
public class TextLines {

    public static List<TextLine> splitString(String text) {
        List<TextLine> result = Lists.newArrayList();
        appendLines(text, result);
        return Collections.unmodifiableList(result);
    }

    /**
     * adapted from org.eclipse.jface.text.DefaultLineTracker.nextDelimiterInfo(String, int)
     */
    public static void appendLines(String text, List<TextLine> result) {
        if (text == null)
            return;
        int length = text.length();
        int nextLineOffset = 0;
        int idx = 0;
        while (idx < length) {
            char currentChar = text.charAt(idx);
            // check for \r or \r\n
            if (currentChar == '\r') {
                int delimiterLength = 1;
                if (idx + 1 < length && text.charAt(idx + 1) == '\n') {
                    delimiterLength++;
                    idx++;
                }
                int lineLength = idx - delimiterLength - nextLineOffset + 1;
                TextLine line = new TextLine(text, nextLineOffset, lineLength, delimiterLength);
                result.add(line);
                nextLineOffset = idx + 1;
            } else if (currentChar == '\n') {
                int lineLength = idx - nextLineOffset;
                TextLine line = new TextLine(text, nextLineOffset, lineLength, 1);
                result.add(line);
                nextLineOffset = idx + 1;
            }
            idx++;
        }
        if (nextLineOffset != length) {
            int lineLength = length - nextLineOffset;
            TextLine line = new TextLine(text, nextLineOffset, lineLength, 0);
            result.add(line);
        }
    }

}