package TP2.asd;
import java.util.Stack;


import org.pcollections.*;
import TP2.asd.Interface.Type;

public class SymTable {
    private Stack<PMap<String,Type>> stackMap;

    public SymTable(){
        this.stackMap= new Stack<>();
    }

    public void next_layer(){
        stackMap.push(HashTreePMap.empty());
    }

    public void quit_layer() throws Exception{
        if(stackMap.isEmpty()){
            throw new Exception();
        }
        stackMap.pop();
    }
    public PMap<String,Type> peppapeek(){
        return stackMap.peek();
    }

    public void addVar(String s, Type t){
        //Save temporary if not PMap wont save
        PMap<String, Type> pmap = this.peppapeek();
        pmap= pmap.plus(s,t);
        //Delete old ones
        stackMap.pop();
        //Push the new one
        stackMap.push(pmap);
    }
    
    //Usually look for var in highest level , if not found research.
    public boolean searchVar(String s){
        for(int i= stackMap.size()-1; i>=0; i--){
            if(stackMap.get(i).containsKey(s)){
                return true;
            }
        }
        return false;
    }
}