/// <summary>
/// Queries the Reserve Table to determine if the current token is a reserve word.
/// If it is then the proper token code is returned from the table.
/// If it is not a reserve word it is given the identifier token code.
/// </summary>
/// <returns></returns>
private int GetIdentifierCode()
{
int code = ReserveTable.LookupName(NextToken.ToUpper());
if (code == -1)
{
return(IDENTIFIER);
}
return(code);
}
/// <summary>
/// Checks if the token is already in the symbol table.
/// If it is not then it is added, otherwise it does nothing.
/// </summary>
private void AddTokenToSymbolTable()
{
string tokenToAdd;
if (TokenCode == IDENTIFIER)
{
tokenToAdd = NextToken.ToUpper();
}
else
{
tokenToAdd = NextToken;
}
int symbolIndex = SymbolTable.LookupSymbol(tokenToAdd);
if (symbolIndex == -1)
{
switch (TokenCode)
{
case IDENTIFIER:
SymbolTable.AddSymbol(tokenToAdd, SymbolKind.Variable, 0);
break;
case INTEGER:
SymbolTable.AddSymbol(tokenToAdd, SymbolKind.Constant, Int64.Parse(tokenToAdd));
break;
case FLOATING_POINT:
SymbolTable.AddSymbol(tokenToAdd, SymbolKind.Constant, Double.Parse(tokenToAdd));
break;
case STRING:
SymbolTable.AddSymbol(tokenToAdd, SymbolKind.Constant, tokenToAdd);
break;
}
}
}