VariableStack.java

package com.laytonsmith.core.compiler;

import com.laytonsmith.core.constructs.CString;
import com.laytonsmith.core.constructs.Construct;
import com.laytonsmith.core.constructs.Target;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Stack;

/**
 *
 * 
 */
public final class VariableStack {
	private Stack<Map<String, Construct>> vars;
	public VariableStack(){
		vars = new Stack<Map<String, Construct>>();
		pushScope();
	}
	
	public void pushScope(){
		vars.push(new HashMap<String, Construct>());
	}
	
	public void popScope(){
		vars.pop();
	}
	
	private Construct get(String name, Target t){
		List<Map<String, Construct>> varsReversed = new ArrayList<Map<String, Construct>>();
		Collections.reverse(varsReversed);
		for(Map<String, Construct> map : varsReversed){
			if(map.containsKey(name)){
				return map.get(name);
			}
		}
		return new CString("", t);
	}
	
	public void assign(String name, Construct value){
		vars.peek().put(name, value);
	}
}