// Returns NProgram
public Node Program()
{
NProgram nProgram = new NProgram();
NVarDefList nVarDefList = new NVarDefList();
NFunDefList nFunDefList = new NFunDefList();
while (firstOfProgram.Contains(CurrentToken))
{
if (CurrentToken == TokenCategory.VAR)
{
VarDef(nVarDefList);
}
else if (CurrentToken == TokenCategory.IDENTIFIER)
{
FunDef(nFunDefList);
}
else if (CurrentToken == TokenCategory.EOF)
{
break;
}
else
{
throw new SyntaxError(firstOfProgram, tokenStream.Current);
}
}
if (!firstOfProgram.Contains(CurrentToken))
{
throw new SyntaxError(new HashSet <TokenCategory>()
{
TokenCategory.IDENTIFIER,
TokenCategory.VAR,
TokenCategory.EOF
}
, tokenStream.Current);
}
nProgram.Add(nVarDefList);
nProgram.Add(nFunDefList);
return(nProgram);
}
