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The DiffUtils library for computing diffs, applying patches, generationg side-by-side view in Java.

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/*-
 * #%L
 * java-diff-utils
 * %%
 * Copyright (C) 2009 - 2017 java-diff-utils
 * %%
 * 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.
 * #L%
 */
package com.github.difflib.text;

import java.util.List;
import static java.util.stream.Collectors.toList;

final class StringUtils {

    /**
     * Replaces all opening an closing tags with < or >.
     *
     * @param str
     * @return
     */
    public static String htmlEntites(String str) {
        return str.replace("<", "<").replace(">", ">");
    }

    public static String normalize(String str) {
        return htmlEntites(str).replace("\t", "    ");
    }

    public static List normalize(List list) {
        return list.stream()
                .map(StringUtils::normalize)
                .collect(toList());
    }

    public static List wrapText(List list, int columnWidth) {
        return list.stream()
                .map(line -> wrapText(line, columnWidth))
                .collect(toList());
    }

    /**
     * Wrap the text with the given column width
     *
     * @param line the text
     * @param columnWidth the given column
     * @return the wrapped text
     */
    public static String wrapText(String line, int columnWidth) {
        if (columnWidth < 0) {
            throw new IllegalArgumentException("columnWidth may not be less 0");
        }
        if (columnWidth == 0) {
            return line;
        }
        int length = line.length();
        int delimiter = "
".length();
        int widthIndex = columnWidth;

        StringBuilder b = new StringBuilder(line);

        for (int count = 0; length > widthIndex; count++) {
            b.insert(widthIndex + delimiter * count, "
");
            widthIndex += columnWidth;
        }

        return b.toString();
    }

    private StringUtils() {
    }
}