import java.util.*;
import java.io.*;
public class SymbolTable{
	//stack of symbols woman
	//stack of array list of symbols
	//ArrayList <Symbol> symbolList;
	private Stack<ArrayList<Symbol>> symbolTable;

	public SymbolTable(){

		//symbolList = new ArrayList<Symbol>();
		symbolTable = new Stack<ArrayList<Symbol>>();
	}

	public void pushScope(){
		ArrayList<Symbol> s = new ArrayList<Symbol>();
		symbolTable.push(s);

	}
	public ArrayList<Symbol> popScope(){

		return symbolTable.pop();

	}
	public boolean insertSymbol(Symbol s){
	//	boolean flag = false;
		//first check to see if the array list, peek on the top of stack
		//see if that array List contains the symbol

		ArrayList<Symbol> symbols = symbolTable.peek();

		for (Symbol s1 : symbols){
			if (s1.equals(s))
			return true;
		}
			symbols.add(s);
			return false;
		//redifined error


	}

	public void updateValue(Value val)
	{
		//save the pop of the stack

		ArrayList <Symbol> temp = symbolTable.pop();
		symbolTable.peek().get(symbolTable.peek().size()-1).updateValue(val);
		symbolTable.push(temp);

	}
	public void printTable(PrintStream outFile)
	{
		int depth = 0;
		for (ArrayList<Symbol> scope : symbolTable) {
		String indentation = new String();
		for (int i=0; i<depth; i++)
		indentation += "    ";
		for (Symbol symbol : scope)
		outFile.println( indentation + symbol );
		depth++;
		}


	}



}