package kata.wordwrap.a20110716;

/**
  * Word Wrap Kata.
  * Copyright (c) 2011, Peter Kofler, licensed under BSD License.
  */
public class WordWrapRegex {

   private static final char NEWLINE = '\n';

   public static String wrap(String line, int maxLineLen) {
      return line.replaceAll("([^ ]{" + maxLineLen + "})" + // force split after exact maxLineLen of non spaces
            "(?=[^ ])" + //                                    which must be followed by a non space
            "|" + //                                           or
            "(?=.{" + maxLineLen + "}.)" + //                  if we have more than maxLineLen characters here, then
            "(.{1," + maxLineLen + "})" + //                   wrap at most after maxLineLen characters
            " ", //                                            and drop the space afterwards
            "$1$2" + NEWLINE);
   }

}