//Mark Klara

//mak241@pitt.edu

//CS 1622 - Project 3

//BlockSymbolTable.java

package symboltable;

import helper.*;

import java.util.List;

import java.util.Hashtable;

import java.util.Set;

public class BlockSymbolTable implements Scope

{

protected Scope parent;

protected Hashtable<String, Variable> vars;

protected Hashtable<String, BlockSymbolTable> blocks;

public BlockSymbolTable(Scope parent)

{

this.parent = parent;

vars = new Hashtable<String, Variable>();

blocks = new Hashtable<String, BlockSymbolTable>();

}

public Scope enterScope(String name)

{

return blocks.get(name);

}

public Scope exitScope()

{

return parent;

}

public void addBlock(String name)

{

blocks.put(name, new BlockSymbolTable(this));

}

public void addVariable(String name, String type)

{

vars.put(name, new Variable(name, type));

}

public Variable localVarLookup(String name)

{

return vars.get(name);

}

public Variable lookupVariable(String name)

{

Variable var = localVarLookup(name);

if(var != null)

{

return var;

}

else

{

return parent.lookupVariable(name);

}

}

public boolean lookupMethod(String name, String[] paramNames, String[] paramTypes, String returnType)

{

return parent.lookupMethod(name, paramNames, paramTypes, returnType);

}

public void printIndentation(int indentLevel)

{

System.out.println("");

for(int i = 0; i < indentLevel; i++)

{

System.out.print("\t");

}

}

public void print(int indentLevel)

{

List<String> keys = Helper.keysToSortedList(vars.keySet());

for(int i = 0; i < keys.size(); i++)

{

printIndentation(indentLevel);

System.out.print(vars.get(keys.get(i)).getType() + " " + vars.get(keys.get(i)).getName() + ";");

}

keys = Helper.keysToSortedList(blocks.keySet());

for(int i = 0; i < keys.size(); i++)

{

blocks.get(keys.get(i)).print(indentLevel+1);

}

}

}