diff --git a/lexer(useless).h b/lexer(useless).h
deleted file mode 100644
index d5cb091..0000000
--- a/lexer(useless).h
+++ /dev/null
@@ -1,183 +0,0 @@
-#ifndef __LEXER_H__
-#define __LEXER_H__
-
-
-#include <iostream>
-#include <fstream>
-#include <cstring>
-#include "nasal.h"
-#include "process_stack.h"
-
-using namespace nasal;
-
-std::string text;
-process_stack _test;
-process_stack_unit _unit;
-
-void PrintProcess(std::string content)
-{
-	std::string Sentence="";
-	int len=(int)content.length();
-	for(int i=0;i<len;++i)
-	{
-		if(content[i]==',')
-			Sentence="";
-		else if(content[i]=='\"')//string mode
-		{
-			Sentence="";
-			for(int j=i+1;j<len;++j)
-			{
-				if(content[j]=='\\' && j+1<len)
-				{
-					Sentence+=content[j];
-					Sentence+=content[j+1];
-					++j;
-				}
-				else if(content[j]=='\"')
-				{
-					i=j;
-					break;
-				}
-				else
-					Sentence+=content[j];
-			}
-			PrintString(Sentence);
-		}
-		else if(content[i]!=' ' && content[i]!='\"' && content[i]!=',')//check var
-		{
-			Sentence="";
-			for(int j=i;j<len;++j)
-			{
-				if(content[j]!=' ' && content[j]!='\"' && content[j]!=',')
-					Sentence+=content[j];
-				if(content[j]==',' || content[j]==' ' || j==len-1)
-				{
-					i=j;
-					break;
-				}
-			}
-			if(_test.check_stack(Sentence))
-			{
-				_test.stack_content_print(Sentence);
-			}
-			else
-				std::cout<<std::endl<<"[Error] "<<Sentence<<" is not declared in this scope."<<std::endl;
-		}
-	}
-	std::cout<<std::endl;
-	return;
-}
-
-void FileProcess(const char *FileName)
-{
-	std::ifstream fin(FileName);
-	
-	fin.close();
-	return;
-}
-
-void CommandProcess()
-{
-	while(1)
-	{
-		std::cout<<">> ";
-		std::getline(std::cin,text);
-		int len=(int)text.length();
-		
-		int sharpDetected=0;
-		for(int i=len-1;i>=0;--i)
-		{
-			if(text[i]=='#')
-			{
-				//ignore sharp
-				len=i;
-				sharpDetected=i;
-			}
-			if(text[i]==';')
-			{
-				len=i+1;
-				//find the real end of the sentence
-				if(sharpDetected)
-				{
-					for(int j=sharpDetected-1;j>=len;--j)
-						if(text[j]!=' ')
-						{
-							len=j+1;
-							break;
-						}
-				}
-				else
-				{
-					for(int j=(int)text.length()-1;j>=len;--j)
-						if(text[j]!=' ')
-						{
-							len=j+1;
-							break;
-						}
-				}
-				break;
-			}
-		}
-		
-		if(text[len-1]==';')
-		{
-			for(int i=0;i<len;++i)
-			{
-				if(text[i]=='p' && i+1<len && text[i+1]=='r' && i+2<len && text[i+2]=='i' && i+3<len && text[i+3]=='n' && i+4<len && text[i+4]=='t')
-				{
-					//In this part every error leads to an error information and breaks the loop!
-					
-					//check the first char after print is '(' or not
-					int string_beg=len-1;
-					for(int j=i+5;j<len;++j)
-						if(text[j]!=' ')
-						{
-							string_beg=j;
-							break;
-						}
-						
-					if(text[string_beg]!='(')
-					{
-						std::cout<<std::endl<<"[Error] Missing \'(\' ."<<std::endl;
-						break;
-					}
-					
-					//check the ')' and the place 
-					int string_end=len-1;
-					for(int j=len-2;j>=0;--j)
-						if(text[j]!=' ')
-						{
-							string_end=j;
-							break;
-						}
-					if(text[string_end]!=')')
-					{
-						std::cout<<std::endl<<"[Error] Missing \')\' ."<<std::endl;
-						break;
-					}
-					
-					std::string content="";
-					for(int j=string_beg+1;j<string_end;++j)
-						content+=text[j];
-					
-					std::cout<<std::endl<<"Target string: "<<content<<std::endl;
-					PrintProcess(content);
-					break;
-				}
-				else if(text[i]=='v' && i+1<len && text[i+1]=='a' && i+2<len && text[i+2]=='r')
-				{
-					;
-				}
-				else if(i==len-1)
-					std::cout<<std::endl<<"[Error] Incorrect command."<<std::endl;
-			}
-		}
-		else
-		{
-			std::cout<<std::endl<<"[Error] Expected \';\' after this line."<<std::endl;
-		}
-	}
-	return;
-}
-
-#endif