public SymbolsScope AddChild(string key = "")
{
var newScope = new SymbolsScope();
newScope.Parent = this;
if (this.Childs.Count == 0)
{
if (key == "")
{
key = "0";
}
this.Childs.Add(key, newScope);
return newScope;
}
var lastChild = this.Childs.Last();
lastChild.Value.Next = newScope;
if (key == "")
{
key = (Convert.ToInt16(lastChild.Key) + 1).ToString();
}
this.Childs.Add(key, newScope);
return newScope;
}
public void UseNamedChildScope(string id)
{
try
{
currScope = currScope.Childs[id];
}
catch (KeyNotFoundException)
{
currScope = currScope.AddChild(id);
}
}
public void UseChildScope()
{
if (currScope.Childs.Count == 0)
{
currScope = currScope.AddChild();
}
else
{
currScope = currScope.Childs.First().Value;
}
}
public void UseParentScope()
{
if (currScope.Parent == null)
{
throw new InvalidOperationException("parent scope does not exist");
}
currScope = currScope.Parent;
}
public void UseGlobalScope()
{
currScope = globalScope;
}
public SymbolTable()
{
globalScope = new SymbolsScope();
UseGlobalScope();
}
