diff --git a/version0.19/nasal_lexer.h b/version0.19/nasal_lexer.h
deleted file mode 100644
index dafcb02..0000000
--- a/version0.19/nasal_lexer.h
+++ /dev/null
@@ -1,525 +0,0 @@
-#ifndef __NASAL_LEXER_H__
-#define __NASAL_LEXER_H__
-
-#include <iostream>
-#include <fstream>
-#include <list>
-#include <cstring>
-
-#define OPERATOR     1  // operator
-#define IDENTIFIER   2  // id
-#define NUMBER       3  // number
-#define RESERVEWORD  4  // reserve word
-#define STRING       5  // string 
-#define DYNAMIC_ID   6 // id...
-#define FAIL        -1  //fail
-#define SCANEND     -2  //complete scanning
-#define ERRORFOUND  -3  //error occurred
-
-std::string reserve_word[15]=
-{
-	"for","foreach","forindex","while",
-	"var","func","break","continue","return",
-	"if","else","elsif","nil","and","or"
-};
-
-int isReserveWord(std::string &p)
-{
-	for(int i=0;i<15;++i)
-		if(reserve_word[i]==p)
-			return i+1;
-	return FAIL;
-}
-
-bool isLetter(char t)
-{
-	return (('a'<=t) && (t<='z') || ('A'<=t) && (t<='Z'));
-}
-
-bool isNumber(char t)
-{
-	return (('0'<=t) && (t<='9'));
-}
-
-bool isHex(char t)
-{
-	return ((('0'<=t) && (t<='9')) || (('a'<=t) && (t<='f')));
-}
-
-bool isOct(char t)
-{
-	return (('0'<=t) && (t<='7'));
-}
-
-class resource_programme_process
-{
-	private:
-		char *resource;
-	public:
-		resource_programme_process()
-		{
-			resource=NULL;
-			resource=new char[16777216];
-		}
-		~resource_programme_process()
-		{
-			if(resource)
-				delete []resource;
-		}
-		char* use_file()
-		{
-			return resource;
-		}
-		void input_file(std::string& filename)
-		{
-			std::ifstream fin(filename);
-			if(fin.fail())
-			{
-				std::cout<<">>[Error] Cannot load file: "<<filename<<" ."<<std::endl;
-				fin.close();
-				return;
-			}
-			memset(resource,0,sizeof(char));
-			int i=0;
-			bool findnote=false;// to find the note with # at the head of line.
-			while(!fin.eof())
-			{
-				resource[i]=fin.get();
-				if(resource[i]=='\n')
-					findnote=false;
-				//when meeting '\n' the findnote is set to false then the next statement can be executed.
-				if(resource[i]!='#' && !findnote)
-					++i;
-				else if(resource[i]=='#')
-					findnote=true;
-				if(fin.eof())
-					break;
-			}
-			resource[i]='\0';
-			fin.close();
-			return;
-		}
-		void print_file()
-		{
-			if(!resource[0])
-			{
-				std::cout<<"0	null"<<std::endl;
-				return;
-			}
-			int line=1;
-			std::cout<<line<<"	";
-			for(int i=0;i<16777216;++i)
-			{
-				if(!resource[i])
-					break;
-				std::cout<<resource[i];
-				if(resource[i]=='\n')
-				{
-					++line;
-					std::cout<<line<<"	";
-				}
-			}
-			std::cout<<std::endl;
-			return;
-		}
-		void del_file()
-		{
-			memset(resource,0,sizeof(char));
-			return;
-		}
-};
-
-struct token
-{
-	int line;
-	int type;
-	std::string content;
-};
-
-class nasal_lexer
-{
-	private:
-		std::list<token> lexer;
-	public:
-		void scanner(int &syn,const char* source,std::string &__token,int &ptr,int &line)
-		{
-			char temp;
-			temp=source[ptr];
-			while(temp==' ' || temp=='\n' || temp=='\t' || temp=='\r' || temp<0 || temp>127)
-			{
-				++ptr;
-				if(temp=='\n')
-					++line;
-				temp=source[ptr];
-			}
-			__token="";
-			if(isLetter(temp) || temp=='_')
-			{
-				__token+=temp;
-				++ptr;
-				temp=source[ptr];
-				while(isLetter(temp) || isNumber(temp) || temp=='_')
-				{
-					__token+=temp;
-					++ptr;
-					temp=source[ptr];
-				}
-				syn=isReserveWord(__token);
-				if(syn==FAIL)
-					syn=IDENTIFIER;
-				else
-					syn=RESERVEWORD;
-				if((syn==IDENTIFIER) && source[ptr]=='.' && source[ptr+1]=='.' && source[ptr+2]=='.')
-				{
-					__token+="...";
-					syn=DYNAMIC_ID;
-					ptr+=3;
-				}
-			}
-			else if(isNumber(temp))
-			{
-				if((source[ptr]=='0') && (source[ptr+1]=='x'))
-				{
-					__token+=source[ptr];
-					__token+=source[ptr+1];
-					ptr+=2;
-					temp=source[ptr];
-					while(isNumber(temp) || isHex(temp))
-					{
-						__token+=temp;
-						++ptr;
-						temp=source[ptr];
-					}
-				}
-				else if((source[ptr]=='0') && (source[ptr+1]=='o'))
-				{
-					__token+=source[ptr];
-					__token+=source[ptr+1];
-					ptr+=2;
-					temp=source[ptr];
-					while(isNumber(temp) || isOct(temp))
-					{
-						__token+=temp;
-						++ptr;
-						temp=source[ptr];
-					}
-				}
-				else
-				{
-					int PointCnt=0;
-					while(isNumber(temp))
-					{
-						__token+=temp;
-						++ptr;
-						temp=source[ptr];
-						if(temp=='.' && !PointCnt)
-						{
-							++PointCnt;
-							__token+=temp;
-							++ptr;
-							temp=source[ptr];
-						}
-					}
-				}
-				syn=NUMBER;
-			}
-			else if(temp=='(' || temp==')' || temp=='[' || temp==']' || temp=='{' ||
-					temp=='}' || temp==',' || temp==';' || temp=='|' || temp==':' ||
-					temp=='?' || temp=='.' || temp=='`' || temp=='&' || temp=='@' ||
-					temp=='%' || temp=='$' || temp=='^')
-			{
-				__token+=temp;
-				++ptr;
-				syn=OPERATOR;
-			}
-			else if(temp=='\'')
-			{
-				syn=STRING;
-				__token+=temp;
-				++ptr;
-				temp=source[ptr];
-				while(temp!='\'')
-				{
-					if(temp=='\\')
-					{
-						__token+=temp;
-						
-						++ptr;
-						temp=source[ptr];
-						__token+=temp;
-						
-						++ptr;
-						temp=source[ptr];
-					}
-					else
-					{
-						__token+=temp;
-						++ptr;
-						temp=source[ptr];
-					}
-					if(temp==0 || temp=='\n')
-						break;
-				}
-				//add the last char \"
-				if(temp=='\'')
-				{
-					__token+=temp;
-					++ptr;
-				}
-				else
-					__token+=" __missing_end_of_string";
-			}
-			else if(temp=='=' || temp=='+' || temp=='-' || temp=='*' || temp=='!' || temp=='/' || temp=='<' || temp=='>' || temp=='~')
-			{
-				syn=OPERATOR;
-				__token+=temp;
-				++ptr;
-				temp=source[ptr];
-				if(temp=='=')
-				{
-					__token+=temp;
-					++ptr;
-				}
-			}
-			else if(temp=='\\')
-			{
-				syn=OPERATOR;
-				__token+=temp;
-				++ptr;
-				temp=source[ptr];
-				if(temp=='=' || temp=='n' || temp=='t' || temp=='r' || temp=='\\' || temp=='\'' || temp=='\"')
-				{
-					__token+=temp;
-					++ptr;
-				}
-			}
-			else if(temp=='\"')
-			{
-				syn=STRING;
-				__token+=temp;
-				++ptr;
-				temp=source[ptr];
-				while(temp!='\"')
-				{
-					if(temp=='\\')
-					{
-						__token+=temp;
-						
-						++ptr;
-						temp=source[ptr];
-						__token+=temp;
-						
-						++ptr;
-						temp=source[ptr];
-					}
-					else
-					{
-						__token+=temp;
-						++ptr;
-						temp=source[ptr];
-					}
-					if(temp==0 || temp=='\n')
-						break;
-				}
-				//add the last char \"
-				if(temp=='\"')
-				{
-					__token+=temp;
-					++ptr;
-				}
-				else
-					__token+=" __missing_end_of_string";
-			}
-			else if(temp==0)
-			{
-				syn=SCANEND;
-				return;
-			}
-			else
-			{
-				syn=FAIL;
-				std::cout<<">>[Error] Unexpected error occurred: "<<temp<<std::endl;
-				system("pause");
-				++ptr;
-				return;
-			}
-			if(__token=="")
-			{
-				syn=ERRORFOUND;
-				std::cout<<">>[Error] Cannot identify "<<std::endl;
-			}
-			return;
-		}
-		void lexer_process(const char *source)
-		{
-			std::cout<<">>[Lexer] max size: "<<lexer.max_size()<<" ."<<std::endl;
-			lexer.clear();
-			int syn=0;//token type
-			int ptr=0;//pointer to one char in ResourcePrograme
-			int line=1;
-			std::string __token;
-			token temp;
-			while(syn!=SCANEND && syn!=ERRORFOUND)
-			{
-				scanner(syn,source,__token,ptr,line);
-				if(syn>0)//all Syn type is larger than zero
-				{
-					temp.line=line;
-					temp.type=syn;
-					temp.content=__token;
-					lexer.push_back(temp);
-				}
-			}
-			std::cout<<">>[Lexer] Complete scanning."<<std::endl;
-			return;
-		}
-		void print_lexer()
-		{
-			token temp;
-			for(std::list<token>::iterator i=lexer.begin();i!=lexer.end();++i)
-			{
-				temp=*i;
-				std::cout<<"line "<<temp.line<<": ";
-				if(temp.type==OPERATOR)
-					std::cout<<"( Operator       | ";
-				else if(temp.type==IDENTIFIER)
-					std::cout<<"( Identifier     | ";
-				else if(temp.type==NUMBER)
-					std::cout<<"( Number         | ";
-				else if(temp.type==RESERVEWORD)
-					std::cout<<"( ReserveWord    | ";
-				else if(temp.type==STRING)
-					std::cout<<"( String         | ";
-				else if(temp.type==DYNAMIC_ID)
-					std::cout<<"( Identifier     | ";
-				std::cout<<temp.content<<" )"<<std::endl;
-			}
-			return;
-		}
-		void token_list_type_detail_edit()
-		{
-			for(std::list<token>::iterator i=lexer.begin();i!=lexer.end();++i)
-			{
-				if((*i).type==RESERVEWORD)
-				{
-					if((*i).content=="var")
-						(*i).type=__var;
-					else if((*i).content=="func")
-						(*i).type=__func;
-					else if((*i).content=="return")
-						(*i).type=__return;
-					else if((*i).content=="nil")
-						(*i).type=__number;
-					else if((*i).content=="continue")
-						(*i).type=__continue;
-					else if((*i).content=="break")
-						(*i).type=__break;
-					else if((*i).content=="and")
-						(*i).type=__and_operator;
-					else if((*i).content=="or")
-						(*i).type=__or_operator;
-					else if((*i).content=="for")
-						(*i).type=__for;
-					else if((*i).content=="forindex")
-						(*i).type=__forindex;
-					else if((*i).content=="foreach")
-						(*i).type=__foreach;
-					else if((*i).content=="while")
-						(*i).type=__while;
-					else if((*i).content=="if")
-						(*i).type=__if;
-					else if((*i).content=="else")
-						(*i).type=__else;
-					else if((*i).content=="elsif")
-						(*i).type=__elsif;
-				}
-				else if(((*i).content=="==") || ((*i).content=="!=") || ((*i).content==">") || ((*i).content==">=") || ((*i).content=="<") || ((*i).content=="<="))
-				{
-					if((*i).content=="==")
-						(*i).type=__cmp_equal;
-					else if((*i).content=="!=")
-						(*i).type=__cmp_not_equal;
-					else if((*i).content==">")
-						(*i).type=__cmp_more;
-					else if((*i).content==">=")
-						(*i).type=__cmp_more_or_equal;
-					else if((*i).content=="<")
-						(*i).type=__cmp_less;
-					else if((*i).content=="<=")
-						(*i).type=__cmp_less_or_equal;
-				}
-				else if(((*i).content==";") || ((*i).content==",") || ((*i).content=="=") || ((*i).content==":") || ((*i).content==".") || ((*i).content=="?") || ((*i).content=="%") || ((*i).content=="$") || ((*i).content=="`") || ((*i).content=="^") || ((*i).content=="@"))
-				{
-					char c=(*i).content[0];
-					switch(c)
-					{
-						case ';':(*i).type=__semi;break;
-						case ',':(*i).type=__comma;break;
-						case '=':(*i).type=__equal;break;
-						case ':':(*i).type=__colon;break;
-						case '.':(*i).type=__dot;break;
-						default:(*i).type=__unknown_operator;break;
-					}
-				}
-				else if(((*i).type==NUMBER) || ((*i).type==STRING) || ((*i).type==IDENTIFIER) || ((*i).type==DYNAMIC_ID))
-				{
-					int t=(*i).type;
-					switch(t)
-					{
-						case NUMBER:(*i).type=__number;break;
-						case STRING:(*i).type=__string;break;
-						case IDENTIFIER:(*i).type=__id;break;
-						case DYNAMIC_ID:(*i).type=__dynamic_id;break;
-					}
-				}
-				else if(((*i).content=="+") || ((*i).content=="-") || ((*i).content=="*") || ((*i).content=="/") || ((*i).content=="~") || ((*i).content=="!"))
-				{
-					char c=(*i).content[0];
-					switch(c)
-					{
-						case '+':(*i).type=__add_operator;break;
-						case '-':(*i).type=__sub_operator;break;
-						case '*':(*i).type=__mul_operator;break;
-						case '/':(*i).type=__div_operator;break;
-						case '~':(*i).type=__link_operator;break;
-						case '!':(*i).type=__nor_operator;break;
-					}
-				}
-				else if(((*i).content=="+=") || ((*i).content=="-=") || ((*i).content=="*=") || ((*i).content=="/=") || ((*i).content=="~="))
-				{
-					char c=(*i).content[0];
-					switch(c)
-					{
-						case '+':(*i).type=__add_equal;break;
-						case '-':(*i).type=__sub_equal;break;
-						case '*':(*i).type=__mul_equal;break;
-						case '/':(*i).type=__div_equal;break;
-						case '~':(*i).type=__link_equal;break;
-					}
-				}
-				else if(((*i).content=="(") || ((*i).content==")") || ((*i).content=="[") || ((*i).content=="]") || ((*i).content=="{") || ((*i).content=="}"))
-				{
-					char c=(*i).content[0];
-					switch(c)
-					{
-						case '(':(*i).type=__left_curve;break;
-						case ')':(*i).type=__right_curve;break;
-						case '[':(*i).type=__left_bracket;break;
-						case ']':(*i).type=__right_bracket;break;
-						case '{':(*i).type=__left_brace;break;
-						case '}':(*i).type=__right_brace;break;
-					}
-				}
-			}
-			return;
-		}
-		std::list<token>& return_list()
-		{
-			return lexer;
-		}
-};
-		
-
-		
-
-#endif