AS3 中文转拼音首字母(一级字库)

文章来自：网易博客-全球鷹

很多时候我们都会用到中文排序,可是在网上搜了一下,貌似没找到有关AS3的,于是自己写了一个.不过只针对一级字库里的字.后来在网上看到一个字符串,字符串长度为20902,太夸张了,居然将Unicode编码范围为19968至40869的汉字的拼音首字母按照顺序全部搞出来了

package 
{
 import flash.utils.ByteArray;

 /**
  * ...
  * @author Will Chen
  * @msn chenyouyou@live.cn
  * @email c_youyou@163.com
  * @version 1.0
  * @description Convert Chinese to abc.
  */
 
 public class ChineseConvert
 {  
  /**
   * 获取一串中文的拼音字母
   * @param chinese <string>Unicode格式的中文字符串
   * @return   <string>拼音声母字符串
   * @example 
   * var chinese:String = "中华人民共和国";
   * var py:String = Convert.convertString(chinese);
   * trace(py); //zhrmghg
   */
  public static function convertString(chinese:String):String 
  {
   var len:int = chinese.length;
   var ret:String = "";
   for (var i:int = 0; i < len; i++) 
   {
    ret += convertChar(chinese.charAt(i));
   }
   return ret;
  }
  
  /**
   * 
   * @param char <String>Unicode格式的一个中文字符
   * @return   <String>中文字符的声母
   * @example
   * var chineseChar:String = "我";
   * var py:String = Convert.convertChar(chineseChar);
   * trace(py); //w
   */
  public static function convertChar(chineseChar:String):String 
  {
   var bytes:ByteArray = new ByteArray();
   bytes.writeMultiByte(chineseChar.charAt(0), "cn-gb");
   var n:int = bytes[0] << 8;
   n += bytes[1];
   if (isIn(0xB0A1, 0xB0C4, n)) return "a";
   if (isIn(0XB0C5, 0XB2C0, n)) return "b";
   if (isIn(0xB2C1, 0xB4ED, n)) return "c";
   if (isIn(0xB4EE, 0xB6E9, n)) return "d";
   if (isIn(0xB6EA, 0xB7A1, n)) return "e";
   if (isIn(0xB7A2, 0xB8c0, n)) return "f";
   if (isIn(0xB8C1, 0xB9FD, n)) return "g";
   if (isIn(0xB9FE, 0xBBF6, n)) return "h";
   if (isIn(0xBBF7, 0xBFA5, n)) return "j";
   if (isIn(0xBFA6, 0xC0AB, n)) return "k";
   if (isIn(0xC0AC, 0xC2E7, n)) return "l";
   if (isIn(0xC2E8, 0xC4C2, n)) return "m";
   if (isIn(0xC4C3, 0xC5B5, n)) return "n";
   if (isIn(0xC5B6, 0xC5BD, n)) return "o";
   if (isIn(0xC5BE, 0xC6D9, n)) return "p";
   if (isIn(0xC6DA, 0xC8BA, n)) return "q";
   if (isIn(0xC8BB, 0xC8F5, n)) return "r";
   if (isIn(0xC8F6, 0xCBF0, n)) return "s";
   if (isIn(0xCBFA, 0xCDD9, n)) return "t";
   if (isIn(0xCDDA, 0xCEF3, n)) return "w";
   if (isIn(0xCEF4, 0xD188, n)) return "x";
   if (isIn(0xD1B9, 0xD4D0, n)) return "y";
   if (isIn(0xD4D1, 0xD7F9, n)) return "z";
   return "\0";
  }
  
  private static function isIn(from:int, to:int, value:int):Boolean
  {  
   return ((value >= from) && (value <= to));
  }
  
  /**
   * 
   * @param chineseChar <String>Unicode格式的一个中文字符
   * @return    <Boolean>是中文返回true,不是返回flase
   */
  public static function isChinese(chineseChar:String):Boolean 
  {
   if (convertChar(chineseChar) == "\0")
   {
    return false;
   }
   return true;
  }
 }
}