private boolean processMixLetter(AnalyzeContext context){
		boolean needLock = false;
		
		if(this.start == -1){//当前的分词器尚未开始处理字符
			if(CharacterUtil.CHAR_ARABIC == context.getCurrentCharType()
					|| CharacterUtil.CHAR_ENGLISH == context.getCurrentCharType()){
				//记录起始指针的位置,标明分词器进入处理状态
				this.start = context.getCursor();
				this.end = start;
			}
			
		}else{//当前的分词器正在处理字符			
			if(CharacterUtil.CHAR_ARABIC == context.getCurrentCharType()
					|| CharacterUtil.CHAR_ENGLISH == context.getCurrentCharType()){
				//记录下可能的结束位置
				this.end = context.getCursor();
				
			}else if(CharacterUtil.CHAR_USELESS == context.getCurrentCharType()
						&& this.isLetterConnector(context.getCurrentChar())){
				//记录下可能的结束位置
				this.end = context.getCursor();
			}else{
				//遇到非Letter字符，输出词元
				Lexeme newLexeme = new Lexeme(context.getBufferOffset() , this.start , this.end - this.start + 1 , Lexeme.TYPE_LETTER);
				context.addLexeme(newLexeme);
				this.start = -1;
				this.end = -1;
			}			
		}
		
		//判断缓冲区是否已经读完
		if(context.isBufferConsumed() && (this.start != -1 && this.end != -1)){
            //缓冲以读完，输出词元
            Lexeme newLexeme = new Lexeme(context.getBufferOffset() , this.start , this.end - this.start + 1 , Lexeme.TYPE_LETTER);
            context.addLexeme(newLexeme);
            this.start = -1;
            this.end = -1;
		}
		
		//判断是否锁定缓冲区
		if(this.start == -1 && this.end == -1){
			//对缓冲区解锁
			needLock = false;
		}else{
			needLock = true;
		}
		return needLock;
	}