package gboat2.base.core.util;
   
   /*
    * 处理javascript中的特殊字符:中文、回车、换行、制表符、双引号。
    * 注：原类处理了单引号，在本地会引起问题，故重写了此类，去掉了对单引号的转义
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
   * to you 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.    
   */
  
  import gboat2.base.bridge.exception.DefaultGboatNestedException;
  
  import java.io.IOException;
  import java.io.StringWriter;
  import java.io.Writer;
  import java.util.Locale;
  
  import org.apache.velocity.app.event.implement.EscapeReference;
  
  /**
   * Escapes the characters in a String to be suitable for use in JavaScript.
   * @see <a href="http://jakarta.apache.org/commons/lang/api/org/apache/commons/lang/StringEscapeUtils.html#escapeJavaScript(java.lang.String)">StringEscapeUtils</a>
   * @author wglass
   * @since 1.5
   */
  public class EscapeJavaScriptReference extends EscapeReference
  {
  
      /**
       * Escapes the characters in a String to be suitable for use in JavaScript.
       * 
       * @param text
       * @return An escaped String.
       * @see <a href="http://jakarta.apache.org/commons/lang/api/org/apache/commons/lang/StringEscapeUtils.html#escapeJavaScript(java.lang.String)">StringEscapeUtils</a>
       */
      protected String escape(Object text)
      {
          return this.escapeJavaScriptString(text.toString());
      }
  
      /**
       * @return attribute "eventhandler.escape.javascript.match"
       */
      protected String getMatchAttribute()
      {
          return "eventhandler.escape.javascript.match";
      }
      
      
      private String escapeJavaScriptString(String str){
      	 if (str == null) {
               return null;
           }
           try {
               StringWriter writer = new StringWriter(str.length() * 2);
               escapeJavaStyleString(writer, str, true, true);
               return writer.toString();
           } catch (IOException ioe) {
               // this should never ever happen while writing to a StringWriter
               throw new DefaultGboatNestedException(ioe);
           }
      	
      }
      
      private static void escapeJavaStyleString(Writer out, String str, boolean escapeSingleQuote,
              boolean escapeForwardSlash) throws IOException {
          if (out == null) {
              throw new IllegalArgumentException("The Writer must not be null");
          }
          if (str == null) {
              return;
          }
          int sz;
          sz = str.length();
          for (int i = 0; i < sz; i++) {
              char ch = str.charAt(i);
  
              // handle unicode
              if (ch > 0xfff) {
              	//某些情况下 velocity会对content中的中文进行一次转义为例如\u5DE5填充值时再对\转义为\\u5DE5
              	//因此会出现问题，此处注释掉对中文的处理,中文字符原样输出
                 // out.write("\\u" + hex(ch));
              	out.write(ch);
              } else if (ch > 0xff) {
                  out.write("\\u0" + hex(ch));
              } else if (ch > 0x7f) {
                 out.write("\\u00" + hex(ch));
             } else if (ch < 32) {
                 switch (ch) {
                     case '\b' :
                         out.write('\\');
                         out.write('b');
                         break;
                     case '\n' :
                         out.write('\\');
                         out.write('n');
                         break;
                     case '\t' :
                         out.write('\\');
                         out.write('t');
                         break;
                     case '\f' :
                         out.write('\\');
                         out.write('f');
                         break;
                     case '\r' :
                         out.write('\\');
                         out.write('r');
                         break;
                     default :
                         if (ch > 0xf) {
                             out.write("\\u00" + hex(ch));
                         } else {
                             out.write("\\u000" + hex(ch));
                         }
                         break;
                 }
             } else {
                 switch (ch) {
                     case '\'' :
                         if (escapeSingleQuote) {
                           out.write('\\');
                         }
                         out.write('\'');
                         //out.write('‘');
                         break;
                     case '"' :
                         out.write('\\');
                         out.write('"');
                         break;
                     case '\\' :
                         out.write('\\');
                         out.write('\\');
                         break;
                         //有些情况下会在velocity值中加入html标签,例如<strong></strong>转义/会出现extjs decode错误
                         //因此注释掉此段逻辑
 //                    case '/' :
 //                        if (escapeForwardSlash) {
 //                            out.write('\\');
 //                        }
 //                        out.write('/');
 //                        break;
                     default :
                         out.write(ch);
                         break;
                 }
             }
         }
     }
     
     private static String hex(char ch) {
         return Integer.toHexString(ch).toUpperCase(Locale.ENGLISH);
     }
     
 
 }