code: /*
   *
   * Copyright (c) 2008, All Rights Reserved.
   *
   * 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.
   *
   * Portions of the code may be copied from Google Collections
   * or Apache Commons projects.
   */
  
  package zemberek.core.io;
  
  
  /**
   * Most code is copied from Commons Lang 2.3
   */
  public class Words {
  
    private Words() {
    }
  
    // Wrapping
    //-----------------------------------------------------------------------
  
    /**
     * <p>Wraps a single line of text, identifying words by <code>' '</code>.</p>
     * <p/>
     * <p>New lines will be separated by the system property line separator. Very long words, such as
     * URLs will <i>not</i> be wrapped.</p>
     * <p/>
     * <p>Leading spaces on a new line are stripped. Trailing spaces are not stripped.</p>
     * <p/>
     * <pre>
     * WordUtils.wrap(null, *) = null
     * WordUtils.wrap("", *) = ""
     * </pre>
     *
     * @param str the String to be word wrapped, may be null
     * @param wrapLength the column to wrap the words at, less than 1 is treated as 1
     * @return a line with newlines inserted, <code>null</code> if null input
     */
    public static String wrap(String str, int wrapLength) {
      return wrap(str, wrapLength, null, false);
    }
  
    /**
     * <p>Wraps a single line of text, identifying words by <code>' '</code>.</p>
     * <p/>
     * <p>Leading spaces on a new line are stripped. Trailing spaces are not stripped.</p>
     * <p/>
     * <pre>
     * WordUtils.wrap(null, *, *, *) = null
     * WordUtils.wrap("", *, *, *) = ""
     * </pre>
     *
     * @param str the String to be word wrapped, may be null
     * @param wrapLength the column to wrap the words at, less than 1 is treated as 1
     * @param newLineStr the string to insert for a new line, <code>null</code> uses the system
     * property line separator
     * @param wrapLongWords true if long words (such as URLs) should be wrapped
     * @return a line with newlines inserted, <code>null</code> if null input
     */
    public static String wrap(String str, int wrapLength, String newLineStr, boolean wrapLongWords) {
      if (str == null) {
        return null;
      }
      if (newLineStr == null) {
        newLineStr = System.getProperty("line.separator");
      }
      if (wrapLength < 1) {
        wrapLength = 1;
      }
      int inputLineLength = str.length();
      int offset = 0;
      StringBuffer wrappedLine = new StringBuffer(inputLineLength + 32);
  
      while ((inputLineLength - offset) > wrapLength) {
        if (str.charAt(offset) == ' ') {
          offset++;
          continue;
        }
        int spaceToWrapAt = str.lastIndexOf(' ', wrapLength + offset);
  
        if (spaceToWrapAt >= offset) {
          // normal case
          wrappedLine.append(str.substring(offset, spaceToWrapAt));
          wrappedLine.append(newLineStr);
          offset = spaceToWrapAt + 1;
  
        } else {
          // really long word or URL
          if (wrapLongWords) {
            // wrap really long word one line at a time
            wrappedLine.append(str.substring(offset, wrapLength + offset));
            wrappedLine.append(newLineStr);
            offset += wrapLength;
          } else {
            // do not wrap really long word, just extend beyond limit
            spaceToWrapAt = str.indexOf(' ', wrapLength + offset);
            if (spaceToWrapAt >= 0) {
              wrappedLine.append(str.substring(offset, spaceToWrapAt));
              wrappedLine.append(newLineStr);
              offset = spaceToWrapAt + 1;
            } else {
              wrappedLine.append(str.substring(offset));
              offset = inputLineLength;
            }
          }
        }
      }
  
      // Whatever is left in line is short enough to just pass through
      wrappedLine.append(str.substring(offset));
  
      return wrappedLine.toString();
    }
  
    // Capitalizing
    //-----------------------------------------------------------------------
  
    /**
     * <p>Capitalizes all the whitespace separated words in a String. Only the first letter of each
     * word is changed. To convert the rest of each word to lowercase at the same time, use {@link
     * #capitalizeFully(String)}.</p>
     * <p/>
     * <p>Whitespace is defined by {@link Character#isWhitespace(char)}. A <code>null</code> input
     * String returns <code>null</code>. Capitalization uses the unicode title case, normally
     * equivalent to upper case.</p>
     * <p/>
     * <pre>
     * WordUtils.capitalize(null)        = null
     * WordUtils.capitalize("")          = ""
     * WordUtils.capitalize("i am FINE") = "I Am FINE"
     * </pre>
     *
     * @param str the String to capitalize, may be null
     * @return capitalized String, <code>null</code> if null String input
     * @see #uncapitalize(String)
     * @see #capitalizeFully(String)
     */
    public static String capitalize(String str) {
      return capitalize(str, null);
    }
  
    /**
     * <p>Capitalizes all the delimiter separated words in a String. Only the first letter of each
     * word is changed. To convert the rest of each word to lowercase at the same time, use {@link
     * #capitalizeFully(String, char[])}.</p>
     * <p/>
     * <p>The delimiters represent a set of characters understood to separate words. The first string
     * character and the first non-delimiter character after a delimiter will be capitalized. </p>
     * <p/>
     * <p>A <code>null</code> input String returns <code>null</code>. Capitalization uses the unicode
     * title case, normally equivalent to upper case.</p>
     * <p/>
     * <pre>
     * WordUtils.capitalize(null, *)            = null
     * WordUtils.capitalize("", *)              = ""
     * WordUtils.capitalize(*, new char[0])     = *
     * WordUtils.capitalize("i am fine", null)  = "I Am Fine"
     * WordUtils.capitalize("i aM.fine", {'.'}) = "I aM.Fine"
     * </pre>
     *
     * @param str the String to capitalize, may be null
     * @param delimiters set of characters to determine capitalization, null means whitespace
     * @return capitalized String, <code>null</code> if null String input
     * @see #uncapitalize(String)
     * @see #capitalizeFully(String)
     * @since 2.1
     */
    public static String capitalize(String str, char[] delimiters) {
      int delimLen = (delimiters == null ? -1 : delimiters.length);
      if (str == null || str.length() == 0 || delimLen == 0) {
        return str;
      }
      int strLen = str.length();
      StringBuffer buffer = new StringBuffer(strLen);
      boolean capitalizeNext = true;
      for (int i = 0; i < strLen; i++) {
        char ch = str.charAt(i);
  
        if (isDelimiter(ch, delimiters)) {
          buffer.append(ch);
          capitalizeNext = true;
        } else if (capitalizeNext) {
          buffer.append(Character.toTitleCase(ch));
          capitalizeNext = false;
        } else {
          buffer.append(ch);
        }
      }
      return buffer.toString();
    }
  
    //-----------------------------------------------------------------------
  
    /**
     * <p>Converts all the whitespace separated words in a String into capitalized words, that is each
     * word is made up of a titlecase character and then a series of lowercase characters.  </p>
     * <p/>
     * <p>Whitespace is defined by {@link Character#isWhitespace(char)}. A <code>null</code> input
     * String returns <code>null</code>. Capitalization uses the unicode title case, normally
     * equivalent to upper case.</p>
     * <p/>
     * <pre>
     * WordUtils.capitalizeFully(null)        = null
     * WordUtils.capitalizeFully("")          = ""
     * WordUtils.capitalizeFully("i am FINE") = "I Am Fine"
     * </pre>
     *
     * @param str the String to capitalize, may be null
     * @return capitalized String, <code>null</code> if null String input
     */
    public static String capitalizeFully(String str) {
      return capitalizeFully(str, null);
    }
  
    /**
     * <p>Converts all the delimiter separated words in a String into capitalized words, that is each
     * word is made up of a titlecase character and then a series of lowercase characters. </p>
     * <p/>
     * <p>The delimiters represent a set of characters understood to separate words. The first string
     * character and the first non-delimiter character after a delimiter will be capitalized. </p>
     * <p/>
     * <p>A <code>null</code> input String returns <code>null</code>. Capitalization uses the unicode
     * title case, normally equivalent to upper case.</p>
     * <p/>
     * <pre>
     * WordUtils.capitalizeFully(null, *)            = null
     * WordUtils.capitalizeFully("", *)              = ""
     * WordUtils.capitalizeFully(*, null)            = *
     * WordUtils.capitalizeFully(*, new char[0])     = *
     * WordUtils.capitalizeFully("i aM.fine", {'.'}) = "I am.Fine"
     * </pre>
     *
     * @param str the String to capitalize, may be null
     * @param delimiters set of characters to determine capitalization, null means whitespace
     * @return capitalized String, <code>null</code> if null String input
     * @since 2.1
     */
    public static String capitalizeFully(String str, char[] delimiters) {
      int delimLen = (delimiters == null ? -1 : delimiters.length);
      if (str == null || str.length() == 0 || delimLen == 0) {
        return str;
      }
      str = str.toLowerCase();
      return capitalize(str, delimiters);
    }
  
    //-----------------------------------------------------------------------
  
    /**
     * <p>Uncapitalizes all the whitespace separated words in a String. Only the first letter of each
     * word is changed.</p>
     * <p/>
     * <p>Whitespace is defined by {@link Character#isWhitespace(char)}. A <code>null</code> input
     * String returns <code>null</code>.</p>
     * <p/>
     * <pre>
     * WordUtils.uncapitalize(null)        = null
     * WordUtils.uncapitalize("")          = ""
     * WordUtils.uncapitalize("I Am FINE") = "i am fINE"
     * </pre>
     *
     * @param str the String to uncapitalize, may be null
     * @return uncapitalized String, <code>null</code> if null String input
     * @see #capitalize(String)
     */
    public static String uncapitalize(String str) {
      return uncapitalize(str, null);
    }
  
    /**
     * <p>Uncapitalizes all the whitespace separated words in a String. Only the first letter of each
     * word is changed.</p>
     * <p/>
     * <p>The delimiters represent a set of characters understood to separate words. The first string
     * character and the first non-delimiter character after a delimiter will be uncapitalized. </p>
     * <p/>
     * <p>Whitespace is defined by {@link Character#isWhitespace(char)}. A <code>null</code> input
     * String returns <code>null</code>.</p>
     * <p/>
     * <pre>
     * WordUtils.uncapitalize(null, *)            = null
     * WordUtils.uncapitalize("", *)              = ""
     * WordUtils.uncapitalize(*, null)            = *
     * WordUtils.uncapitalize(*, new char[0])     = *
     * WordUtils.uncapitalize("I AM.FINE", {'.'}) = "i AM.fINE"
     * </pre>
     *
     * @param str the String to uncapitalize, may be null
     * @param delimiters set of characters to determine uncapitalization, null means whitespace
     * @return uncapitalized String, <code>null</code> if null String input
     * @see #capitalize(String)
     * @since 2.1
     */
    public static String uncapitalize(String str, char[] delimiters) {
      int delimLen = (delimiters == null ? -1 : delimiters.length);
      if (str == null || str.length() == 0 || delimLen == 0) {
        return str;
      }
      int strLen = str.length();
      StringBuilder buffer = new StringBuilder(strLen);
      boolean uncapitalizeNext = true;
      for (int i = 0; i < strLen; i++) {
        char ch = str.charAt(i);
  
        if (isDelimiter(ch, delimiters)) {
          buffer.append(ch);
          uncapitalizeNext = true;
        } else if (uncapitalizeNext) {
          buffer.append(Character.toLowerCase(ch));
          uncapitalizeNext = false;
        } else {
          buffer.append(ch);
        }
      }
      return buffer.toString();
    }
  
    //-----------------------------------------------------------------------
  
    /**
     * <p>Extracts the initial letters from each word in the String.</p>
     * <p/>
     * <p>The first letter of the string and all first letters after whitespace are returned as a new
     * string. Their case is not changed.</p>
     * <p/>
     * <p>Whitespace is defined by {@link Character#isWhitespace(char)}. A <code>null</code> input
     * String returns <code>null</code>.</p>
     * <p/>
     * <pre>
     * WordUtils.initials(null)             = null
     * WordUtils.initials("")               = ""
     * WordUtils.initials("Ben John Lee")   = "BJL"
     * WordUtils.initials("Ben J.Lee")      = "BJ"
     * </pre>
     *
     * @param str the String to get initials from, may be null
     * @return String of initial letters, <code>null</code> if null String input
     * @see #initials(String, char[])
     * @since 2.2
     */
    public static String initials(String str) {
      return initials(str, null);
    }
  
    /**
     * <p>Extracts the initial letters from each word in the String.</p>
     * <p/>
     * <p>The first letter of the string and all first letters after the defined delimiters are
     * returned as a new string. Their case is not changed.</p>
     * <p/>
     * <p>If the delimiters array is null, then Whitespace is used. Whitespace is defined by {@link
     * Character#isWhitespace(char)}. A <code>null</code> input String returns <code>null</code>. An
     * empty delimiter array returns an empty String.</p>
     * <p/>
     * <pre>
     * WordUtils.initials(null, *)                = null
     * WordUtils.initials("", *)                  = ""
     * WordUtils.initials("Ben John Lee", null)   = "BJL"
     * WordUtils.initials("Ben J.Lee", null)      = "BJ"
     * WordUtils.initials("Ben J.Lee", [' ','.']) = "BJL"
     * WordUtils.initials(*, new char[0])         = ""
     * </pre>
     *
     * @param str the String to get initials from, may be null
     * @param delimiters set of characters to determine words, null means whitespace
     * @return String of initial letters, <code>null</code> if null String input
     * @see #initials(String)
     * @since 2.2
     */
    public static String initials(String str, char[] delimiters) {
      if (str == null || str.length() == 0) {
        return str;
      }
      if (delimiters != null && delimiters.length == 0) {
        return "";
      }
      int strLen = str.length();
      char[] buf = new char[strLen / 2 + 1];
      int count = 0;
      boolean lastWasGap = true;
      for (int i = 0; i < strLen; i++) {
        char ch = str.charAt(i);
  
        if (isDelimiter(ch, delimiters)) {
          lastWasGap = true;
        } else if (lastWasGap) {
          buf[count++] = ch;
          lastWasGap = false;
        } else {
          // ignore ch
        }
      }
      return new String(buf, 0, count);
    }
  
    //-----------------------------------------------------------------------
  
    /**
     * Is the character a delimiter.
     *
     * @param ch the character to check
     * @param delimiters the delimiters
     * @return true if it is a delimiter
     */
    private static boolean isDelimiter(char ch, char[] delimiters) {
      if (delimiters == null) {
        return Character.isWhitespace(ch);
      }
      for (char delimiter : delimiters) {
        if (ch == delimiter) {
          return true;
        }
      }
      return false;
    }
  
  }
  