package com.jdon.cms.content.filter;

import java.util.*;
import com.jdon.cms.content.ContentFilter;

import com.jdon.util.StringUtil;

/**
 *
 * <p>Title: </p>
 * <p>Description: </p>
 * <p>Copyright: Jdon.com Copyright (c) 2003</p>
 * <p>Company: </p>
 * @author banq
 * @version 1.0
 */

public class HTMLFilter implements ContentFilter {

  public String change(String content) {

     content = toHtml(content);

     return content;

  }

  public String unchange(String content) {

    content = unHtml(content);

    return content;


  }

  //特殊字符轉(zhuǎn)為Html
  private static String toHtml(String s) {
    s = StringUtil.replace(s, "&", "&amp;");
//    s = StringUtil.replace(s, "<", "&lt;");
//    s = StringUtil.replace(s, ">", "&gt;");
    s = StringUtil.replace(s, "\t", "    ");
    s = StringUtil.replace(s, "\r\n", "\n");
    s = StringUtil.replace(s, "\n", "<br>");
    s = StringUtil.replace(s, "  ", " &nbsp;");
    s = StringUtil.replace(s, "'", "&#39;");
    s = StringUtil.replace(s, "\\", "&#92;");
    return s;
  }

  //逆
  public static String unHtml(String s) {
    s = StringUtil.replace(s, "<br>", "\n");
    s = StringUtil.replace(s, "&nbsp;", " ");
    return s;
  }

}