public MalType Get(MalSymbol key)
{
if (DictHasSymbol(key))
{
return(_dict[key]);
}
if (_outer != null)
{
return(_outer.Get(key));
}
return(null);
}
public MalType Apply(MalSymbol firstItem, MalList <MalType> restItems)
{
if (FuncsHasSymbol(firstItem))
{
return(_funcs[firstItem](restItems));
}
if (_outer != null)
{
return(_outer.Apply(firstItem, restItems));
}
return(null);
}
internal MalType GetSymbol(MalSymbol symbol)
{
if (DictHasSymbol(symbol))
{
return(_dict[symbol]);
}
if (FuncsHasSymbol(symbol))
{
return(symbol);
}
if (_outer != null && _outer.HasSymbol(symbol))
{
return(_outer.GetSymbol(symbol));
}
throw new SymbolNotFoundException("attempted to Environment with invalid symbol", null);
}
internal bool FuncsHasSymbol(MalSymbol symbol)
{
return(_funcs.ContainsKey(symbol));
}
internal bool DictHasSymbol(MalSymbol symbol)
{
return(_dict.ContainsKey(symbol));
}
internal bool HasSymbol(MalSymbol symbol)
{
return(DictHasSymbol(symbol) || FuncsHasSymbol(symbol) || (_outer != null && _outer.HasSymbol(symbol)));
}
public MalType Set(MalSymbol key, MalType value)
{
_dict[key] = value;
return(value);
}