#include "LSystem.h"

/*Default Constructor*/
LSystem::LSystem()
{
	init = "";
	
	iterations = 0;
}

/*sets the initial string */
void LSystem::setInit(string s)
{
	init = s;
}

/* adds a ruled to the L-System*/
void LSystem::addRule(char c, string s)
{
	
	rules.insert(map<char,string>::value_type(c,s));
}

/* sets the number of times the grammar will regenerate */
void LSystem::setIterations(int i)
{
	iterations = i;
}

/* returns the output of the L-System */
string LSystem::output()
{
	string out = init;
	for(int i =0; i<iterations;i++)
	{
		out = replace(out,rules);
	}
	
	return out;
}

/*used to rewrite a string for one iteration*/
string LSystem::replace(string s, map<char,string> m)
{
	char c;
	string out = "";
	
	string temp = "";
	for(int i = 0 ; i<s.length() ; i++)
	{
		c = s[i];
		temp = c;
		map<char,string>::iterator itr = m.find(c);
		if(itr != m.end())
			out += (*itr).second;
		else
			out += c;
		
	}
	
	return out;
}

/* returns a Rules String for the Win32 dialog box */
string LSystem::getRulesString()
{
	string value = "";
	map<char,string>::iterator itr;
	
	/* go through all the rules and print them */
	for(itr = rules.begin() ; itr != rules.end() ; itr++)
	{
		value += (*itr).first;
		value += "=";
		value += (*itr).second;
		value += "\r\r\n";
	}
	
	return value;
	
}

/* clears out the rules */
void LSystem::emptyRules()
{
	rules.clear();
}

void LSystem::setRules(string s)
{
	emptyRules();
	int index=0;
	
	
	while((index =s.find('=',index+1)) > 0)
	{
		addRule(s[index-1],s.substr(index+1,(s.find_first_of("\r\0",index)-1)));
	}
}