public bool Define(Token name, VType type)
{
if (!Values.TryAdd(name.Lexeme, type))
{
string definedType = Enum.GetName(typeof(VType), Values[name.Lexeme]);
VenaError.ParseError(name, $"Variable '{name.Lexeme}' already defined with type '{definedType}'.");
return(false);
}
return(true);
}
public bool ValidAssignment(Token name, VType assignType)
{
// Check to see if the token has already been defined.
if (!Values.ContainsKey(name.Lexeme))
{
VenaError.ParseError(name, $"Undefined variable '{name.Lexeme}'.");
return(false);
}
// Check to see if the defined token matches the assignee type.
if (Values[name.Lexeme] == assignType)
{
return(true);
}
VenaError.ParseError(name,
$"Assigning type '{Enum.GetName(typeof(VType), assignType)}' to already defined type '{Enum.GetName(typeof(VType), Values[name.Lexeme])}'.");
return(false);
}
ParseError Error(Token token, String message)
{
VenaError.ParseError(token, message);
return(new ParseError());
}