| /* |
| * Copyright 2013, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| package org.jf.util; |
| |
| import javax.annotation.Nonnull; |
| import javax.annotation.Nullable; |
| import java.io.PrintStream; |
| import java.text.BreakIterator; |
| import java.util.Iterator; |
| |
| public class StringWrapper { |
| /** |
| * Splits the given string into lines of maximum width maxWidth. The splitting is done using the current locale's |
| * rules for splitting lines. |
| * |
| * @param string The string to split |
| * @param maxWidth The maximum length of any line |
| * @return An iterable of Strings containing the wrapped lines |
| */ |
| public static Iterable<String> wrapStringOnBreaks(@Nonnull final String string, final int maxWidth) { |
| // TODO: should we strip any trailing newlines? |
| final BreakIterator breakIterator = BreakIterator.getLineInstance(); |
| breakIterator.setText(string); |
| |
| return new Iterable<String>() { |
| @Override |
| public Iterator<String> iterator() { |
| return new Iterator<String>() { |
| private int currentLineStart = 0; |
| private boolean nextLineSet = false; |
| private String nextLine; |
| |
| @Override |
| public boolean hasNext() { |
| if (!nextLineSet) { |
| calculateNext(); |
| } |
| return nextLine != null; |
| } |
| |
| private void calculateNext() { |
| int lineEnd = currentLineStart; |
| while (true) { |
| lineEnd = breakIterator.following(lineEnd); |
| if (lineEnd == BreakIterator.DONE) { |
| lineEnd = breakIterator.last(); |
| if (lineEnd <= currentLineStart) { |
| nextLine = null; |
| nextLineSet = true; |
| return; |
| } |
| break; |
| } |
| |
| if (lineEnd - currentLineStart > maxWidth) { |
| lineEnd = breakIterator.preceding(lineEnd); |
| if (lineEnd <= currentLineStart) { |
| lineEnd = currentLineStart + maxWidth; |
| } |
| break; |
| } |
| |
| if (string.charAt(lineEnd-1) == '\n') { |
| nextLine = string.substring(currentLineStart, lineEnd-1); |
| nextLineSet = true; |
| currentLineStart = lineEnd; |
| return; |
| } |
| } |
| nextLine = string.substring(currentLineStart, lineEnd); |
| nextLineSet = true; |
| currentLineStart = lineEnd; |
| } |
| |
| @Override |
| public String next() { |
| String ret = nextLine; |
| nextLine = null; |
| nextLineSet = false; |
| return ret; |
| } |
| |
| @Override |
| public void remove() { |
| throw new UnsupportedOperationException(); |
| } |
| }; |
| } |
| }; |
| } |
| |
| /** |
| * Splits the given string into lines using on any embedded newlines, and wrapping the text as needed to conform to |
| * the given maximum line width. |
| * |
| * This uses and assumes unix-style newlines |
| * |
| * @param str The string to split |
| * @param maxWidth The maximum length of any line |
| * @param output If given, try to use this array as the return value. If there are more values than will fit |
| * into the array, a new array will be allocated and returned, while the given array will be filled |
| * with as many lines as would fit. |
| * @return The split lines from the original, as an array of Strings. The returned array may be larger than the |
| * number of lines. If this is the case, the end of the split lines will be denoted by a null entry in the |
| * array. If there is no null entry, then the size of the array exactly matches the number of lines. |
| * The returned lines will not contain an ending newline |
| */ |
| public static String[] wrapString(@Nonnull String str, int maxWidth, @Nullable String[] output) { |
| if (output == null) { |
| output = new String[(int)((str.length() / maxWidth) * 1.5d + 1)]; |
| } |
| |
| int lineStart = 0; |
| int arrayIndex = 0; |
| int i; |
| for (i=0; i<str.length(); i++) { |
| char c = str.charAt(i); |
| |
| if (c == '\n') { |
| output = addString(output, str.substring(lineStart, i), arrayIndex++); |
| lineStart = i+1; |
| } else if (i - lineStart == maxWidth) { |
| output = addString(output, str.substring(lineStart, i), arrayIndex++); |
| lineStart = i; |
| } |
| } |
| if (lineStart != i || i == 0) { |
| output = addString(output, str.substring(lineStart), arrayIndex++, output.length+1); |
| } |
| |
| if (arrayIndex < output.length) { |
| output[arrayIndex] = null; |
| } |
| return output; |
| } |
| |
| private static String[] addString(@Nonnull String[] arr, String str, int index) { |
| if (index >= arr.length) { |
| arr = enlargeArray(arr, (int)(Math.ceil((arr.length + 1) * 1.5))); |
| } |
| |
| arr[index] = str; |
| return arr; |
| } |
| |
| private static String[] addString(@Nonnull String[] arr, String str, int index, int newLength) { |
| if (index >= arr.length) { |
| arr = enlargeArray(arr, newLength); |
| } |
| |
| arr[index] = str; |
| return arr; |
| } |
| |
| private static String[] enlargeArray(String[] arr, int newLength) { |
| String[] newArr = new String[newLength]; |
| System.arraycopy(arr, 0, newArr, 0, arr.length); |
| return newArr; |
| } |
| |
| public static void printWrappedString(@Nonnull PrintStream stream, @Nonnull String string) { |
| printWrappedString(stream, string, ConsoleUtil.getConsoleWidth()); |
| } |
| |
| public static void printWrappedString(@Nonnull PrintStream stream, @Nonnull String string, int maxWidth) { |
| for (String str: wrapStringOnBreaks(string, maxWidth)) { |
| stream.println(str); |
| } |
| } |
| } |