#ifndef __ABSTRACT_SYNTAX_TREE_CPP__
#define __ABSTRACT_SYNTAX_TREE_CPP__
#include "abstract_syntax_tree.h"


int exit_type=0;
std::stack<var> ret_stack; // for function ret use(especially the recursion)
int recursion_depth=0;     // avoid deep recursion to sigsegv 
std::string str_for_input; // avoid stack overflow
var* append_addr;          // used in append function

var abstract_syntax_tree::calculation()
{
	++recursion_depth;
	if(recursion_depth>512)
	{
		exit_type=__sigsegv_segmentation_error;
		std::cout<<">>[Runtime-error] line "<<line<<":[SIGSEGV] too deep recursion(calc)."<<std::endl;
		return error_var;
	}
	var temp;
	temp.set_type(__null_type);
	if(this->type==__number)
	{
		temp.set_type(__var_number);
		temp.set_number(number);
		--recursion_depth;
		return temp;
	}
	else if(this->type==__string)
	{
		temp.set_type(__var_string);
		temp.set_string(str);
		--recursion_depth;
		return temp;
	}
	else if(this->type==__id)
	{
		temp=this->call_identifier();
		--recursion_depth;
		return temp;
	}
	else if(this->type==__array)
	{
		temp.set_type(__var_array);
		if(!children.empty())
			for(std::list<abstract_syntax_tree>::iterator i=children.begin();i!=children.end();++i)
				temp.append_array(i->calculation());
		--recursion_depth;
		return temp;
	}
	else if(this->type==__hash)
	{
		temp.set_type(__var_hash);
		if(!children.empty())
			for(std::list<abstract_syntax_tree>::iterator i=children.begin();i!=children.end();++i)
			{
				var t;
				t=i->children.front().calculation();
				t.set_name(i->name);
				temp.append_hash(t);
			}
		--recursion_depth;
		return temp;
	}
	else if(this->type==__function)
	{
		temp.set_type(__var_function);
		temp.set_function(*this);
		--recursion_depth;
		return temp;
	}
	if(this->type==__nor_operator)
	{
		temp.set_type(__var_number);
		temp=children.front().calculation();
		if(temp.get_type()!=__var_number)
		{
			exit_type=__error_value_type;
			std::cout<<">>[Runtime-error] line "<<line<<": must use a number to use \'!\' but use \'";
			print_scalar(temp.get_type());
			std::cout<<"\'."<<std::endl;
		}
		else
		{
			if(temp.get_number())
				temp.set_number(0);
			else
				temp.set_number(1);
		}
		--recursion_depth;
		return temp;
	}
	else if(this->type==__add_operator)
	{
		temp.set_type(__var_number);
		var left_child=children.front().calculation();
		var right_child=children.back().calculation();
		if(left_child.get_type()==__var_number && right_child.get_type()==__var_number)
			temp.set_number(left_child.get_number()+right_child.get_number());
		else
		{
			exit_type=__error_value_type;
			std::cout<<">>[Runtime-error] line "<<line<<": must use a number to use \'+\' but use \'";
			print_scalar(left_child.get_type());
			std::cout<<"\' and \'";
			print_scalar(right_child.get_type());
			std::cout<<"\'."<<std::endl;
		}
	}
	else if(this->type==__sub_operator)
	{
		temp.set_type(__var_number);
		std::list<abstract_syntax_tree>::iterator i=children.begin();
		++i;
		if(i==children.end())
		{
			temp=children.front().calculation();
			if(temp.get_type()==__var_number)
				temp.set_number(temp.get_number()*(-1));
			else
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<line<<": must use a number to use \'-\' but use \'";
				print_scalar(temp.get_type());
				std::cout<<"\'."<<std::endl;
			}
		}
		else
		{
			var left_child=children.front().calculation();
			var right_child=children.back().calculation();
			if(left_child.get_type()==__var_number && right_child.get_type()==__var_number)
				temp.set_number(left_child.get_number()-right_child.get_number());
			else
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<line<<": must use a number to use \'-\' but use \'";
				print_scalar(left_child.get_type());
				std::cout<<"\' and \'";
				print_scalar(right_child.get_type());
				std::cout<<"\'."<<std::endl;
			}
		}
	}
	else if(this->type==__mul_operator)
	{
		temp.set_type(__var_number);
		var left_child=children.front().calculation();
		var right_child=children.back().calculation();
		if(left_child.get_type()==__var_number && right_child.get_type()==__var_number)
			temp.set_number(left_child.get_number()*right_child.get_number());
		else
		{
			exit_type=__error_value_type;
			std::cout<<">>[Runtime-error] line "<<line<<": must use a number to use \'*\' but use \'";
			print_scalar(left_child.get_type());
			std::cout<<"\' and \'";
			print_scalar(right_child.get_type());
			std::cout<<"\'."<<std::endl;
		}
	}
	else if(this->type==__div_operator)
	{
		temp.set_type(__var_number);
		var left_child=children.front().calculation();
		var right_child=children.back().calculation();
		if(left_child.get_type()==__var_number && right_child.get_type()==__var_number)
		{
			temp.set_number(left_child.get_number()/right_child.get_number());
			if(std::isnan(temp.get_number()) || std::isinf(temp.get_number()))
			{
				exit_type=__sigfpe_arithmetic_exception;
				std::cout<<">>[Runtime-error] line "<<line<<": get number \'NaN\' or \'Inf\'."<<std::endl;
			}
		}
		else
		{
			exit_type=__error_value_type;
			std::cout<<">>[Runtime-error] line "<<line<<": must use a number to use \'/\' but use \'";
			print_scalar(left_child.get_type());
			std::cout<<"\' and \'";
			print_scalar(right_child.get_type());
			std::cout<<"\'."<<std::endl;
		}
	}
	else if(this->type==__link_operator)
	{
		temp.set_type(__var_string);
		var left_child=children.front().calculation();
		var right_child=children.back().calculation();
		if(left_child.get_type()==__var_string && right_child.get_type()==__var_string)
			temp.set_string(left_child.get_string()+right_child.get_string());
		else
		{
			exit_type=__error_value_type;
			std::cout<<">>[Runtime-error] line "<<line<<": must use a string to use \'~\' but use \'";
			print_scalar(left_child.get_type());
			std::cout<<"\' and \'";
			print_scalar(right_child.get_type());
			std::cout<<"\'."<<std::endl;
		}
	}
	else if(this->type==__cmp_equal)
	{
		temp.set_type(__var_number);
		var left_child=children.front().calculation();
		var right_child=children.back().calculation();
		if(left_child.get_type()==right_child.get_type())
		{
			if(left_child.get_type()==__var_number)
				temp.set_number((double)(left_child.get_number()==right_child.get_number()));
			else if(left_child.get_type()==__var_string)
				temp.set_number((double)(left_child.get_string()==right_child.get_string()));
			else
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<line<<": must use number or string to use \'==\' but use \'";
				print_scalar(left_child.get_type());
				std::cout<<"\'."<<std::endl;
			}
		}
		else
		{
			exit_type=__error_value_type;
			std::cout<<">>[Runtime-error] line "<<line<<": must use same type to use \'==\' but use \'";
			print_scalar(left_child.get_type());
			std::cout<<"\' and \'";
			print_scalar(right_child.get_type());
			std::cout<<"\'."<<std::endl;
		}
	}
	else if(this->type==__cmp_not_equal)
	{
		temp.set_type(__var_number);
		var left_child=children.front().calculation();
		var right_child=children.back().calculation();
		if(left_child.get_type()==right_child.get_type())
		{
			if(left_child.get_type()==__var_number)
				temp.set_number((double)(left_child.get_number()!=right_child.get_number()));
			else if(left_child.get_type()==__var_string)
				temp.set_number((double)(left_child.get_string()!=right_child.get_string()));
			else
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<line<<": must use number or string to use \'!=\' but use \'";
				print_scalar(left_child.get_type());
				std::cout<<"\'."<<std::endl;
			}
		}
		else
		{
			exit_type=__error_value_type;
			std::cout<<">>[Runtime-error] line "<<line<<": must use same type to use \'!=\' but use \'";
			print_scalar(left_child.get_type());
			std::cout<<"\' and \'";
			print_scalar(right_child.get_type());
			std::cout<<"\'."<<std::endl;
		}
	}
	else if(this->type==__cmp_less)
	{
		temp.set_type(__var_number);
		var left_child=children.front().calculation();
		var right_child=children.back().calculation();
		if(left_child.get_type()==right_child.get_type())
		{
			if(left_child.get_type()==__var_number)
				temp.set_number((double)(left_child.get_number()<right_child.get_number()));
			else if(left_child.get_type()==__var_string)
				temp.set_number((double)(left_child.get_string()<right_child.get_string()));
			else
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<line<<": must use number or string to use \'<\' but use \'";
				print_scalar(left_child.get_type());
				std::cout<<"\'."<<std::endl;
			}
		}
		else
		{
			exit_type=__error_value_type;
			std::cout<<">>[Runtime-error] line "<<line<<": must use same type to use \'<\' but use \'";
			print_scalar(left_child.get_type());
			std::cout<<"\' and \'";
			print_scalar(right_child.get_type());
			std::cout<<"\'."<<std::endl;
		}
	}
	else if(this->type==__cmp_more)
	{
		temp.set_type(__var_number);
		var left_child=children.front().calculation();
		var right_child=children.back().calculation();
		if(left_child.get_type()==right_child.get_type())
		{
			if(left_child.get_type()==__var_number)
				temp.set_number((double)(left_child.get_number()>right_child.get_number()));
			else if(left_child.get_type()==__var_string)
				temp.set_number((double)(left_child.get_string()>right_child.get_string()));
			else
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<line<<": must use number or string to use \'>\' but use \'";
				print_scalar(left_child.get_type());
				std::cout<<"\'."<<std::endl;
			}
		}
		else
		{
			exit_type=__error_value_type;
			std::cout<<">>[Runtime-error] line "<<line<<": must use same type to use \'>\' but use \'";
			print_scalar(left_child.get_type());
			std::cout<<"\' and \'";
			print_scalar(right_child.get_type());
			std::cout<<"\'."<<std::endl;
		}
	}
	else if(this->type==__cmp_less_or_equal)
	{
		temp.set_type(__var_number);
		var left_child=children.front().calculation();
		var right_child=children.back().calculation();
		if(left_child.get_type()==right_child.get_type())
		{
			if(left_child.get_type()==__var_number)
				temp.set_number((double)(left_child.get_number()<=right_child.get_number()));
			else if(left_child.get_type()==__var_string)
				temp.set_number((double)(left_child.get_string()<=right_child.get_string()));
			else
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<line<<": must use number or string to use \'<=\' but use \'";
				print_scalar(left_child.get_type());
				std::cout<<"\'."<<std::endl;
			}
		}
		else
		{
			exit_type=__error_value_type;
			std::cout<<">>[Runtime-error] line "<<line<<": must use same type to use \'<=\' but use \'";
			print_scalar(left_child.get_type());
			std::cout<<"\' and \'";
			print_scalar(right_child.get_type());
			std::cout<<"\'."<<std::endl;
		}
	}
	else if(this->type==__cmp_more_or_equal)
	{
		temp.set_type(__var_number);
		var left_child=children.front().calculation();
		var right_child=children.back().calculation();
		if(left_child.get_type()==right_child.get_type())
		{
			if(left_child.get_type()==__var_number)
				temp.set_number((double)(left_child.get_number()>=right_child.get_number()));
			else if(left_child.get_type()==__var_string)
				temp.set_number((double)(left_child.get_string()>=right_child.get_string()));
			else
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<line<<": must use number or string to use \'>=\' but use \'";
				print_scalar(left_child.get_type());
				std::cout<<"\'."<<std::endl;
			}
		}
		else
		{
			exit_type=__error_value_type;
			std::cout<<">>[Runtime-error] line "<<line<<": must use same type to use \'>=\' but use \'";
			print_scalar(left_child.get_type());
			std::cout<<"\' and \'";
			print_scalar(right_child.get_type());
			std::cout<<"\'."<<std::endl;
		}
	}
	else if(this->type==__or_operator)
	{
		temp.set_type(__var_number);
		var left_child=children.front().calculation();
		var right_child=children.back().calculation();
		if(left_child.get_type()==__var_number && right_child.get_type()==__var_number)
			temp.set_number((double)(left_child.get_number() || right_child.get_number()));
		else
		{
			exit_type=__error_value_type;
			std::cout<<">>[Runtime-error] line "<<line<<": must use same type to use \'or\' but use \'";
			print_scalar(left_child.get_type());
			std::cout<<"\' and \'";
			print_scalar(right_child.get_type());
			std::cout<<"\'."<<std::endl;
		}
	}
	else if(this->type==__and_operator)
	{
		temp.set_type(__var_number);
		var left_child=children.front().calculation();
		var right_child=children.back().calculation();
		if(left_child.get_type()==__var_number && right_child.get_type()==__var_number)
			temp.set_number((double)(left_child.get_number() && right_child.get_number()));
		else
		{
			exit_type=__error_value_type;
			std::cout<<">>[Runtime-error] line "<<line<<": must use same type to use \'and\' but use \'";
			print_scalar(left_child.get_type());
			std::cout<<"\' and \'";
			print_scalar(right_child.get_type());
			std::cout<<"\'."<<std::endl;
		}
	}
	else
	{
		exit_type=__error_value_type;
		std::cout<<">>[Runtime-error] line "<<line<<": error type \'";
		print_detail_token(this->type);
		std::cout<<"\' occurred when doing calculation."<<std::endl;
	}
	--recursion_depth;
	return temp;
}

bool abstract_syntax_tree::condition_check()
{
	++recursion_depth;
	if(recursion_depth>512)
	{
		exit_type=__sigsegv_segmentation_error;
		std::cout<<">>[Runtime-error] line "<<line<<":[SIGSEGV] too deep recursion(check)."<<std::endl;
		return false;
	}
	if(type==__null_node) // this is set for "for(;;)"
	{
		--recursion_depth;
		return true;
	}
	bool ret=false;
	var temp=calculation();
	if(temp.get_type()==__var_number)
	{
		if(temp.get_number())
			ret=true;
	}
	else
	{
		exit_type=__error_value_type;
		std::cout<<">>[Runtime-error] line "<<line<<": must use a number to make a choice but use \'";
		print_scalar(temp.get_type());
		std::cout<<"\'."<<std::endl;
	}
	--recursion_depth;
	return ret;
}

var abstract_syntax_tree::call_identifier()
{
	++recursion_depth;
	if(recursion_depth>512)
	{
		exit_type=__sigsegv_segmentation_error;
		std::cout<<">>[Runtime-error] line "<<line<<":[SIGSEGV] too deep recursion(call)."<<std::endl;
		return error_var;
	}
	var temp;
	temp.set_type(__null_type);
	if(scope.search_var(name))
		temp=scope.get_var(name);
	else
	{
		std::cout<<">>[Runtime-error] line "<<line<<": cannot find a var named \'"<<name<<"\'."<<std::endl;
		exit_type=__find_var_failure;
		--recursion_depth;
		return temp;
	}
	if(!children.empty())
	{
		for(std::list<abstract_syntax_tree>::iterator i=children.begin();i!=children.end();++i)
		{
			if(i->type==__call_array && temp.get_type()==__var_array)
			{
				var place=i->children.front().calculation();
				if(place.get_type()==__var_number)
				{
					if(place.get_number()>=0)
						temp=temp.get_array_member((int)place.get_number());
					else
					{
						exit_type=__get_value_failure;
						std::cout<<">>[Runtime-error] line"<<i->line<<": number shouldn't be less than 0 when calling an array."<<std::endl;
						break;
					}
				}
				else
				{
					exit_type=__error_value_type;
					std::cout<<">>[Runtime-error] line "<<i->line<<": ";
					print_detail_token(i->type);
					std::cout<<": incorrect type \'";
					print_scalar(temp.get_type());
					std::cout<<"\'."<<std::endl;
					break;
				}
			}
			else if(i->type==__call_hash && temp.get_type()==__var_hash)
			{
				temp=temp.get_hash_member(i->name);
				if(temp.get_type()==__null_type)
				{
					exit_type=__get_value_failure;
					std::cout<<">>[Runtime-error] line "<<i->line<<": cannot find a hash-member named \'"<<i->name<<"\' or this value is set to __null_type. detail: ";
					temp.print_var();
					std::cout<<"."<<std::endl;
					break;
				}
			}
			else if(i->type==__call_function && temp.get_type()==__var_function)
			{
				var self;
				self.set_type(__var_function);
				self.set_name(temp.get_name());
				self.set_function(temp.get_function());
				if(temp.get_name()=="append")
				{
					append_addr=NULL;
					if(!i->children.empty())
						append_addr=i->children.begin()->get_var_addr();
				}
				std::list<var> parameter;
				if(!i->children.empty())
					for(std::list<abstract_syntax_tree>::iterator j=i->children.begin();j!=i->children.end();++j)
						parameter.push_back(j->calculation());
				temp=temp.get_function().run_func(parameter,self);
			}
			else
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<i->line<<": ";
				print_detail_token(i->type);
				std::cout<<": incorrect type \'";
				print_scalar(temp.get_type());
				std::cout<<"\'."<<std::endl;
				break;
			}
		}
	}
	--recursion_depth;
	return temp;
}

var* abstract_syntax_tree::get_var_addr()
{
	++recursion_depth;
	if(recursion_depth>512)
	{
		exit_type=__sigsegv_segmentation_error;
		std::cout<<">>[Runtime-error] line "<<line<<":[SIGSEGV] too deep recursion(addr)."<<std::endl;
		return &error_var;
	}
	var* addr=&error_var;
	if(scope.search_var(name))
		addr=scope.get_addr(name);
	else
	{
		std::cout<<">>[Runtime-error] line "<<line<<": cannot find a var named \'"<<name<<"\'."<<std::endl;
		exit_type=__find_var_failure;
		return addr;
	}
	if(!children.empty())
	{
		for(std::list<abstract_syntax_tree>::iterator i=children.begin();i!=children.end();++i)
		{
			if(i->type==__call_array && addr->get_type()==__var_array)
			{
				var place=i->children.front().calculation();
				if(place.get_type()==__var_number)
				{
					if(place.get_number()>=0)
						addr=addr->get_array_member_addr((int)place.get_number());
					else
					{
						exit_type=__get_value_failure;
						std::cout<<">>[Runtime-error] line"<<i->line<<": number shouldn't be less than 0 when calling an array."<<std::endl;
						break;
					}
				}
				else
				{
					exit_type=__error_value_type;
					std::cout<<">>[Runtime-error] line "<<i->line<<": ";
					print_detail_token(i->type);
					std::cout<<": incorrect type \'";
					print_scalar(addr->get_type());
					std::cout<<"\'."<<std::endl;
					break;
				}
			}
			else if(i->type==__call_hash && addr->get_type()==__var_hash)
			{
				addr=addr->get_hash_member_addr(i->name);
				if(addr->get_type()==__null_type)
				{
					exit_type=__get_value_failure;
					std::cout<<">>[Runtime-error] line "<<i->line<<": cannot find a hash-member named \'"<<i->name<<"\'."<<std::endl;
					break;
				}
			}
			else if(i->type==__call_function && addr->get_type()==__var_function)
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<i->line<<": function-returned value cannot be assigned."<<std::endl;
				break;
			}
			else
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<i->line<<": ";
				print_detail_token(i->type);
				std::cout<<": incorrect type \'";
				print_scalar(addr->get_type());
				std::cout<<"\'."<<std::endl;
				break;
			}
		}
	}
	--recursion_depth;
	return addr;
}

var abstract_syntax_tree::assignment()
{
	++recursion_depth;
	if(recursion_depth>512)
	{
		exit_type=__sigsegv_segmentation_error;
		std::cout<<">>[Runtime-error] line "<<line<<":[SIGSEGV] too deep recursion(assignment)."<<std::endl;
		return error_var;
	}
	var ret,temp;
	abstract_syntax_tree id=children.front();
	abstract_syntax_tree value=children.back();
	var* addr=id.get_var_addr();
	if(value.type==__equal || value.type==__add_equal || value.type==__sub_equal || value.type==__mul_equal || value.type==__div_equal || value.type==__link_equal)
		temp=value.assignment();
	else
		temp=value.calculation();
	if(type==__equal)
	{
		std::string tname=addr->get_name();
		*addr=temp;
		addr->set_name(tname);
	}
	else if(type==__add_equal || type==__sub_equal || type==__mul_equal || type==__div_equal)
	{
		if(addr->get_type()==__var_number && temp.get_type()==__var_number)
		{
			switch(type)
			{
				case __add_equal:addr->set_number(addr->get_number()+temp.get_number());break;
				case __sub_equal:addr->set_number(addr->get_number()-temp.get_number());break;
				case __mul_equal:addr->set_number(addr->get_number()*temp.get_number());break;
				case __div_equal:addr->set_number(addr->get_number()/temp.get_number());break;
			}
			if(std::isnan(addr->get_number()) || std::isinf(addr->get_number()))
			{
				exit_type=__sigfpe_arithmetic_exception;
				std::cout<<">>[Runtime-error] line "<<line<<": get number \'NaN\' or \'Inf\'."<<std::endl;
			}
		}
		else
		{
			exit_type=__error_value_type;
			std::cout<<">>[Runtime-error] line "<<line<<": incorrect type \'";
			print_scalar(addr->get_type());
			std::cout<<"\' and \'";
			print_scalar(temp.get_type());
			std::cout<<"\' but this operator ";
			print_detail_token(type);
			std::cout<<" must use \'number\' and \'number\'."<<std::endl;
		}
	}
	else if(type==__link_equal)
	{
		if(addr->get_type()==__var_string && temp.get_type()==__var_string)
			addr->set_string(addr->get_string()+temp.get_string());
		else
		{
			exit_type=__error_value_type;
			std::cout<<">>[Runtime-error] line "<<line<<": incorrect type \'";
			print_scalar(addr->get_type());
			std::cout<<"\' and \'";
			print_scalar(temp.get_type());
			std::cout<<"\' but this operator ~ must use \'string\' and \'string\'."<<std::endl;
		}
	}
	
	ret=*addr;
	--recursion_depth;
	return ret;
}

void abstract_syntax_tree::run_root()
{
	recursion_depth=0;
	++recursion_depth;
	
	// before running initializing
	while(!ret_stack.empty())ret_stack.pop();
	scope.set_clear();
	srand(unsigned(time(NULL)));
	int beg_time,end_time;
	exit_type=__process_exited_successfully;
	
	beg_time=time(NULL);
	for(std::list<abstract_syntax_tree>::iterator i=children.begin();i!=children.end();++i)
	{
		if(i->type==__definition)
		{
			var new_var;
			std::list<abstract_syntax_tree>::iterator j=i->children.begin();
			std::string _name=j->name;
			if(!scope.check_redefine(_name))
			{
				++j;
				if(j!=i->children.end())
					new_var=j->calculation();
				new_var.set_name(_name);
				scope.add_new_var(new_var);
			}
			else
			{
				std::cout<<">>[Runtime-error] line "<<i->line<<": redeclaration of \'"<<_name<<"\'."<<std::endl;
				exit_type=__redeclaration;
				break;
			}
		}
		else if(i->type==__equal || i->type==__add_equal || i->type==__sub_equal || i->type==__mul_equal || i->type==__div_equal || i->type==__link_equal)
			i->assignment();
		else if(i->type==__add_operator || i->type==__sub_operator || i->type==__mul_operator || i->type==__div_operator || i->type==__link_operator || i->type==__or_operator || i->type==__and_operator || i->type==__nor_operator)
			var t=i->calculation();
		else if(i->type==__number || i->type==__string)
			;
		else if(i->type==__id)
			i->call_identifier();
		else if(i->type==__while || i->type==__for)
		{
			scope.add_new_block_scope();
			int ret_type=i->run_loop();
			if(ret_type==__return)
			{
				std::cout<<"[Runtime-error] line "<<i->line<<": incorrect use of break/continue."<<std::endl;
				exit_type=__error_command_use;
			}
			scope.pop_last_block_scope();
		}
		else if(i->type==__ifelse)
		{
			scope.add_new_block_scope();
			int ret_type=i->run_ifelse();
			if(ret_type==__continue || ret_type==__break || ret_type==__return)
			{
				std::cout<<"[Runtime-error] line "<<i->line<<": incorrect use of break/continue."<<std::endl;
				exit_type=__error_command_use;
			}
			scope.pop_last_block_scope();
		}
		if(exit_type!=__process_exited_successfully)
			break;
	}
	end_time=time(NULL);
	std::cout<<std::endl<<"------------------------------------------------------------------------------"<<std::endl;
	if(exit_type!=__process_exited_successfully)
		alert_sound();
	std::cout<<">>[Runtime] process exited after "<<end_time-beg_time<<" sec(s) with returned state \'";
	print_exit_type(exit_type);
	std::cout<<"\'."<<std::endl;
	scope.set_clear();
	return;
}

int abstract_syntax_tree::run_loop()
{
	++recursion_depth;
	if(recursion_depth>512)
	{
		exit_type=__sigsegv_segmentation_error;
		std::cout<<">>[Runtime-error] line "<<line<<":[SIGSEGV] too deep recursion(loop)."<<std::endl;
		return 0;
	}
	int ret=0;
	if(type==__while)
	{
		abstract_syntax_tree condition=children.front();
		abstract_syntax_tree blk=children.back();
		while(condition.condition_check())
		{
			int type=blk.run_block();
			if(type==__break)
				break;
			else if(type==__return)
			{
				ret=__return;
				break;
			}
			if(exit_type!=__process_exited_successfully)
				break;
		}
	}
	else if(type==__for)
	{
		std::list<abstract_syntax_tree>::iterator iter=children.begin();
		abstract_syntax_tree def=*iter;
		++iter;
		abstract_syntax_tree condition=*iter;
		++iter;
		abstract_syntax_tree var_changement=*iter;
		abstract_syntax_tree blk=children.back();
		
		scope.add_new_local_scope();
		if(def.type==__definition)
		{
			var new_var;
			std::list<abstract_syntax_tree>::iterator j=def.children.begin();
			std::string _name=j->name;
			if(!scope.check_redefine(_name))
			{
				++j;
				if(j!=def.children.end())
					new_var=j->calculation();
				new_var.set_name(_name);
				scope.add_new_var(new_var);
			}
			else
			{
				std::cout<<">>[Runtime-error] line "<<line<<": redeclaration of \'"<<_name<<"\'."<<std::endl;
				exit_type=__redeclaration;
			}
		}
		else if(def.type==__equal || def.type==__add_equal || def.type==__sub_equal || def.type==__mul_equal || def.type==__div_equal || def.type==__link_equal)
			def.assignment();
		else if(def.type==__id)
			def.call_identifier();
		
		while(condition.condition_check())
		{
			int type=blk.run_block();
			if(type==__break)
				break;
			else if(type==__return)
			{
				ret=__return;
				break;
			}
			if(exit_type!=__process_exited_successfully)
				break;
			if(var_changement.type==__equal || var_changement.type==__add_equal || var_changement.type==__sub_equal || var_changement.type==__mul_equal || var_changement.type==__div_equal || var_changement.type==__link_equal)
				var_changement.assignment();
			else if(var_changement.type==__id)
				var_changement.call_identifier();
		}
		scope.pop_last_local_scope();
	}
	--recursion_depth;
	return ret;
}

int abstract_syntax_tree::run_ifelse()
{
	++recursion_depth;
	if(recursion_depth>512)
	{
		exit_type=__sigsegv_segmentation_error;
		std::cout<<">>[Runtime-error] line "<<line<<":[SIGSEGV] too deep recursion(choose)."<<std::endl;
		return 0;
	}
	int ret=0;
	for(std::list<abstract_syntax_tree>::iterator i=children.begin();i!=children.end();++i)
	{
		if((i->type==__if || i->type==__elsif) && i->children.front().condition_check())
		{
			ret=i->children.back().run_block();
			break;
		}
		else if(i->type==__else)
		{
			ret=i->children.back().run_block();
			break;
		}
	}
	--recursion_depth;
	return ret;
}

var abstract_syntax_tree::run_func(std::list<var> parameter,var self_func)
{
	++recursion_depth;
	if(recursion_depth>512)
	{
		exit_type=__sigsegv_segmentation_error;
		std::cout<<">>[Runtime-error] line "<<line<<":[SIGSEGV] too deep recursion(function)."<<std::endl;
		return error_var;
	}
	
	var ret;
	// ret is used to return function's value
	// ret must be pushed into stack:ret_stack
	// ret_stack is used for recursion
	// before each function ends,a var will be poped from stack
	// and the ret will be set as this poped var.
	scope.add_new_block_scope();
	scope.add_new_local_scope();
	
	scope.add_new_var(self_func);
	
	abstract_syntax_tree para=children.front();// get parameter name(declared in function)
	abstract_syntax_tree blk=children.back();  // get block
	std::list<abstract_syntax_tree>::iterator para_name=para.children.begin();
	std::list<var>::iterator para_value=parameter.begin();
	
	
	if(self_func.get_name()=="print")
	{
		std::string temp_str;
		for(std::list<var>::iterator i=parameter.begin();i!=parameter.end();++i)
		{
			switch(i->get_type())
			{
				case __null_type:std::cout<<">>[Runtime-error] cannot print null value."<<std::endl;exit_type=__error_value_type;break;
				case __var_number:std::cout<<i->get_number();break;
				case __var_string:
					temp_str=i->get_string();
					for(int j=0;j<temp_str.length();++j)
					{
						if(temp_str[j]!='\\')
							std::cout<<temp_str[j];
						else
						{
							++j;
							switch(temp_str[j])
							{
								case 'n':std::cout<<'\n';break;
								case 't':std::cout<<'\t';break;
								case 'r':std::cout<<'\r';break;
								case '\\':std::cout<<'\\';break;
								case '\'':std::cout<<'\'';break;
								case '\"':std::cout<<'\"';break;
								default:--j;break;
							}
						}
					}
					break;
				case __var_array:std::cout<<">>[Runtime-error] cannot print array value."<<std::endl;exit_type=__error_value_type;break;
				case __var_hash:std::cout<<">>[Runtime-error] cannot print hash value."<<std::endl;exit_type=__error_value_type;break;
				case __var_function:std::cout<<">>[Runtime-error] cannot print function."<<std::endl;exit_type=__error_value_type;break;
				default:std::cout<<">>[Runtime-error] cannot print unknown value."<<std::endl;exit_type=__error_value_type;break;
			}
			if(exit_type==__error_value_type)
				break;
		}
		// this must be added when running a function
		ret.set_type(__var_number);
		if(exit_type!=__error_value_type)
			ret.set_number(1);
		else
			ret.set_number(0);
		ret_stack.push(ret);
	}
	else if(self_func.get_name()=="append")
	{
		if(append_addr)
		{
			std::list<var>::iterator i=parameter.begin();
			if(append_addr->get_type()==__var_array)
			{
				++i;
				for(;i!=parameter.end();++i)
					append_addr->append_array(*i);
			}
			else if(append_addr->get_type()==__null_type)
			{
				std::cout<<">>[Runtime-error] line "<<line<<": cannot find a var named \'"<<parameter.begin()->get_name()<<"\'."<<std::endl;
				exit_type=__find_var_failure;
			}
			else
			{
				std::cout<<">>[Runtime-error] line "<<line<<": called var's type is not an array."<<std::endl;
				exit_type=__error_value_type;
			}
		}
		else
		{
			exit_type=__lack_parameter;
			std::cout<<">>[Runtime-error] line "<<line<<": lack parameter(s)."<<std::endl;
		}
		// this must be added when running a function
		ret.set_type(__var_number);
		if(exit_type!=__find_var_failure)
			ret.set_number(1);
		else
			ret.set_number(0);
		ret_stack.push(ret);
	}
	else if(self_func.get_name()=="int")
	{
		if(!parameter.empty())
		{
			std::list<var>::iterator i=parameter.begin();
			if(i->get_type()==__var_number)
			{
				int temp;
				temp=(int)(i->get_number());
				ret.set_type(__var_number);
				ret.set_number((double)temp);
			}
			else
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<this->line<<": incorrect value type.must use a number."<<std::endl;
			}
		}
		else
		{
			exit_type=__lack_parameter;
			std::cout<<">>[Runtime-error] line "<<this->line<<": lack parameter(s)."<<std::endl;
		}
		// this must be added when running a function
		if(exit_type!=__process_exited_successfully)
			ret.set_type(__null_type);
		ret_stack.push(ret);
	}
	else if(self_func.get_name()=="num")
	{
		if(!parameter.empty())
		{
			std::list<var>::iterator i=parameter.begin();
			if(i->get_type()==__var_string && check_number(i->get_string()))
			{
				std::string str=i->get_string();
				ret.set_type(__var_number);
				// use this->set_number to help trans the str to number
				this->set_number(str);
				ret.set_number(this->number);
			}
			else
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<this->line<<": incorrect value type.must use a string that can be put into a number."<<std::endl;
			}
		}
		else
		{
			exit_type=__lack_parameter;
			std::cout<<">>[Runtime-error] line "<<this->line<<": lack parameter(s)."<<std::endl;
		}
		// this must be added when running a function
		if(exit_type!=__process_exited_successfully)
			ret.set_type(__null_type);
		ret_stack.push(ret);
	}
	else if(self_func.get_name()=="input")
	{
		ret.set_type(__var_string);
		str_for_input="";
		std::cin>>str_for_input;
		ret.set_string(str_for_input);
		ret_stack.push(ret);
	}
	else if(self_func.get_name()=="size")
	{
		if(!parameter.empty())
		{
			std::list<var>::iterator i=parameter.begin();
			if(i->get_type()==__var_array)
			{
				int cnt=0;
				cnt=i->get_array_size();
				ret.set_type(__var_number);
				ret.set_number((double)cnt);
			}
			else
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<this->line<<": incorrect value type.must use an array."<<std::endl;
			}
		}
		else
		{
			exit_type=__lack_parameter;
			std::cout<<">>[Runtime-error] line "<<this->line<<": lack parameter(s)."<<std::endl;
		}
		// this must be added when running a function
		if(exit_type!=__process_exited_successfully)
			ret.set_type(__null_type);
		ret_stack.push(ret);
	}
	else if(self_func.get_name()=="rand")
	{
		ret.set_type(__var_number);
		double content=rand();
		while(content>=1)content/=10;
		ret.set_number(content);
		// this must be added when running a function
		ret_stack.push(ret);
	}
	else if(self_func.get_name()=="chars")
	{
		if(!parameter.empty())
		{
			std::list<var>::iterator i=parameter.begin();
			if(i->get_type()==__var_string)
			{
				std::string str=i->get_string();
				ret.set_type(__var_array);
				std::string temp="";
				for(int j=0;j<str.length();++j)
				{
					temp="";
					temp+=str[j];
					var new_var;
					new_var.set_type(__var_string);
					new_var.set_string(temp);
					ret.append_array(new_var);
				}
			}
			else
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<this->line<<": incorrect value type.must use a string."<<std::endl;
			}
		}
		else
		{
			exit_type=__lack_parameter;
			std::cout<<">>[Runtime-error] line "<<this->line<<": lack parameter(s)."<<std::endl;
		}
		// this must be added when running a function
		if(exit_type!=__process_exited_successfully)
			ret.set_type(__null_type);
		ret_stack.push(ret);
	}
	else if(self_func.get_name()=="read")
	{
		if(!parameter.empty())
		{
			std::list<var>::iterator i=parameter.begin();
			if(i->get_type()==__var_string)
			{
				std::string str=i->get_string();
				ret.set_type(__var_array);
				std::ifstream fin(str);
				if(fin.fail())
				{
					exit_type=__open_file_failed;
					std::cout<<">>[Runtime-error] line "<<this->line<<": cannot open file named \'"<<str<<"\' ."<<std::endl;
				}
				if(exit_type==__process_exited_successfully)
				{
					while(!fin.eof())
					{
						fin>>str;
						var new_str;
						new_str.set_type(__var_string);
						new_str.set_string(str);
						ret.append_array(new_str);
					}
				}
				fin.close();
			}
			else
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<this->line<<": incorrect value type.filename is a string."<<std::endl;
			}
		}
		else
		{
			exit_type=__lack_parameter;
			std::cout<<">>[Runtime-error] line "<<this->line<<": lack parameter(s)."<<std::endl;
		}
		// this must be added when running a function
		if(exit_type!=__process_exited_successfully)
			ret.set_type(__null_type);
		ret_stack.push(ret);
	}
	else if(self_func.get_name()=="write")
	{
		ret.set_type(__null_type);
		if(!parameter.empty())
		{
			std::list<var>::iterator i=parameter.begin();
			if(i->get_type()==__var_string)
			{
				std::string str=i->get_string();
				std::ofstream fout(str);
				if(fout.fail())
				{
					exit_type=__open_file_failed;
					std::cout<<">>[Runtime-error] line "<<this->line<<": cannot open file named \'"<<str<<"\' ."<<std::endl;
					fout.close();
				}
				if(exit_type==__process_exited_successfully)
				{
					++i;
					if(i!=parameter.end())
					{
						if(i->get_type()==__var_array)
						{
							int size=i->get_array_size();
							for(int j=0;j<size;++j)
							{
								var temp=i->get_array_member(j);
								if(temp.get_type()==__var_number)
									fout<<temp.get_number()<<(j<size-1? ' ':'\n');
								else if(temp.get_type()==__var_string)
									fout<<temp.get_string()<<(j<size-1? ' ':'\n');
								else
									std::cout<<">>[Runtime] warning: line "<<this->line<<": cannot put array/hash/function into a file."<<std::endl;
							}
						}
						else
						{
							exit_type=__error_value_type;
							std::cout<<">>[Runtime-error] line "<<this->line<<": output must use an array."<<std::endl;
						}
					}
					else
					{
						exit_type=__lack_parameter;
						std::cout<<">>[Runtime-error] line "<<this->line<<": lack parameter(s)."<<std::endl;
					}	
					fout.close();
				}
			}
			else
			{
				exit_type=__error_value_type;
				std::cout<<">>[Runtime-error] line "<<this->line<<": incorrect value type.filename is a string."<<std::endl;
			}
		}
		else
		{
			exit_type=__lack_parameter;
			std::cout<<">>[Runtime-error] line "<<this->line<<": lack parameter(s)."<<std::endl;
		}
		// this must be added when running a function
		ret_stack.push(ret);
	}
	else
	{
		for(;para_name!=para.children.end();++para_name,++para_value)
		{
			if(para_value==parameter.end() && para_name!=para.children.end())
			{
				exit_type=__lack_parameter;
				std::cout<<">>[Runtime-error] line "<<line<<": lack parameter(s)."<<std::endl;
				break;
			}
			var new_var;
			new_var=*para_value;
			new_var.set_name(para_name->name);
			scope.add_new_var(new_var);
		}
		// this must be added when running a function
		if(exit_type==__process_exited_successfully)
		{
			int _t=blk.run_block();
			// in case the exit_type is not __process_exited_successfully in run_block
			// or the function does not have return value;
			if(_t!=__return)
				ret_stack.push(error_var);
		}
		else
			ret_stack.push(error_var);
	}
	
	//get return
	scope.pop_last_block_scope();
	ret=ret_stack.top();
	ret_stack.pop();
	--recursion_depth;
	return ret;
}

int abstract_syntax_tree::run_block()
{
	++recursion_depth;
	if(recursion_depth>512)
	{
		exit_type=__sigsegv_segmentation_error;
		std::cout<<">>[Runtime-error] line "<<line<<":[SIGSEGV] too deep recursion(block)."<<std::endl;
		return 0;
	}
	scope.add_new_local_scope();
	int ret=0;
	for(std::list<abstract_syntax_tree>::iterator i=children.begin();i!=children.end();++i)
	{
		if(i->type==__definition)
		{
			var new_var;
			std::list<abstract_syntax_tree>::iterator j=i->children.begin();
			std::string _name=j->name;
			if(!scope.check_redefine(_name))
			{
				++j;
				if(j!=i->children.end())
					new_var=j->calculation();
				new_var.set_name(_name);
				scope.add_new_var(new_var);
			}
			else
			{
				std::cout<<">>[Runtime-error] line "<<i->line<<": redeclaration of \'"<<_name<<"\'."<<std::endl;
				exit_type=__redeclaration;
			}
		}
		else if(i->type==__number || i->type==__string)
			;
		else if(i->type==__id)
			i->call_identifier();
		else if(i->type==__equal || i->type==__add_equal || i->type==__sub_equal || i->type==__mul_equal || i->type==__div_equal || i->type==__link_equal)
			i->assignment();
		else if(i->type==__add_operator || i->type==__sub_operator || i->type==__mul_operator || i->type==__div_operator || i->type==__link_operator || i->type==__or_operator || i->type==__and_operator || i->type==__nor_operator)
			i->calculation();
		else if(i->type==__while || i->type==__for)
		{
			int type=i->run_loop();
			if(type)
			{
				if(type==__return)
				{
					ret=type;
					break;
				}
				else
				{
					std::cout<<"[Runtime-error] line "<<i->line<<": incorrect use of break/continue."<<std::endl;
					exit_type=__error_command_use;
				}
			}
		}
		else if(i->type==__ifelse)
		{
			int type=i->run_ifelse();
			if(type)
			{
				ret=type;
				break;
			}
		}
		else if(i->type==__continue || i->type==__break)
		{
			ret=i->type;
			break;
		}
		else if(i->type==__return)
		{
			var temp;
			temp.set_type(__null_type);
			if(!(i->children.empty()))
				temp=i->children.front().calculation();
			ret_stack.push(temp);
			ret=__return;
			break;
		}
		if(exit_type!=__process_exited_successfully)
			break;
	}
	scope.pop_last_local_scope();
	--recursion_depth;
	return ret;
}


#endif