package bookshop.util;

/**
 * <p>負責字符串的處理 </p>
 */
import java.lang.*;
import java.util.*;

public class dataFormat {
  public dataFormat() {  }
  /**
   * 把字符串轉換成適合于網頁顯示的文本
   * @param s
   * @return
   */
  public static String toHtml(String s) {
	 if (s==null) return s;
	 s=strReplace(s,"&","&amp;");
	 s=strReplace(s,"<","&lt;");
	 s=strReplace(s,">","&gt;");
	 s=strReplace(s,"\"","&quot;");
	 s=parseReturn(s,"<br>\n&nbsp;&nbsp;&nbsp;&nbsp;");
	 return s;
   }
   /**
	* 把字符串sBody中的sFrom用sTo替換
	* @param sBody
	* @param sFrom
	* @param sTo
	* @return
	*/
   public static String strReplace(String sBody, String sFrom, String sTo) {
	  int i,j,k,l;
	  if (sBody==null || sBody.equals("")) return "";
	  i = 0;
	  j = sFrom.length();
	  k = sTo.length();
	  StringBuffer sss = new StringBuffer(sBody.length());
	  boolean bFirst=true;
	  l = i;
	  while (sBody.indexOf(sFrom,i)!=-1) {
		i = sBody.indexOf(sFrom,i);
		sss.append(sBody.substring(l,i));
		sss.append(sTo);
		i += j;
		l = i;
	  }
	  sss.append(sBody.substring(l));
	  return sss.toString();
	}
	/**
	   * 把字符串中的"\r\n"轉換成"\n"
	   * @param String sBody  : 要進行替換操作的字符串
	   * @param String sEndwith : 要替換成為的字符串
	   */
	  public static String parseReturn(String sBody, String sEndwith) {
		StringTokenizer t = new StringTokenizer(sBody, "\r\n");
		StringBuffer sss = new StringBuffer(sBody.length());
		boolean bFirst=true;
		if (sEndwith.trim().equals("")) sEndwith="\n";
		while (t.hasMoreTokens()) {
		  String s=t.nextToken();
		  s=s.trim();
		  while (s.startsWith("　")) s=s.substring(2);
		  if (!s.equals("")) {
			 if (bFirst) {
			  bFirst=false;
			} else {
			  sss.append(sEndwith);
			}
			sss.append(s);
		 }
		}
		return sss.toString();
	  }
	  /**
		  * 將字符串格式化成 HTML 代碼輸出
		  * 只轉換特殊字符，適合于 HTML 中的表單區域
		  * @param str 要格式化的字符串
		  * @return 格式化后的字符串
		  */
		 public static String toHtmlInput(String str) {
			 if (str == null)    return null;
			 String html = new String(str);
			 html = strReplace(html, "&", "&amp;");
			 html = strReplace(html, "<", "&lt;");
			 html = strReplace(html, ">", "&gt;");
			 return html;
		 }
	  /**
	 * 將普通字符串格式化成數據庫認可的字符串格式
	 *
	 * @param str 要格式化的字符串
	 * @return 合法的數據庫字符串
	 */
	public static String toSql(String str) {
		String sql = new String(str);
		return strReplace(sql, "'", "''");
	}
}