public override AST.Node ToAST(Env env)
{
if (Id.IsReservedIdentifier(id.symbol))
{
throw new EReservedIdentifier(Pos, id.symbol);
}
if (env.GetLable(id.symbol) != null)
{
throw new ERedfineLabel(Pos, id.symbol);
}
string transformed = env.AddLabel(id.symbol);
return(new AST.Labeled(transformed, stmt.ToAST(env)));
}
public override AST.Node ToAST(Env env)
{
if (Id.IsReservedIdentifier(label))
{
throw new EReservedIdentifier(Pos, label);
}
string rename = env.GetLable(label);
if (rename == null)
{
throw new EUndefinedIdentifier(Pos, label);
}
return(new AST.GoTo(rename));
}