public PrgState execute(PrgState state)
{
MyIFileDictionary <int, KeyValuePair <string, StreamReader> > dict = state.getFileTable();
try
{
for (int i = 0; i < dict.size(); i++)
{
if (dict.lookup(i).Key == filename)
{
throw new MyException("Filename already exists!");
}
}
StreamReader br = null;
FileStream fr = null;
try
{
fr = new FileStream(filename, FileMode.Open);
br = new StreamReader(fr);
KeyValuePair <string, StreamReader> p = new KeyValuePair <string, StreamReader>(filename, br);
int uniqKey = this.key.getGeneratedKey();
dict.add(uniqKey, p);
//int lastKey = dict.getKey();
MyIDictionary <string, int> symTbl = state.getSymTable();
symTbl.add(var_file_id, uniqKey);
}
catch (IOException e)
{
throw new IOException(e.ToString());
}
}
catch (MyException ex)
{
throw new MyException("" + ex);
}
return(state);
}
public PrgState execute(PrgState state)
{
MyIDictionary <string, int> symTbl = state.getSymTable();
MyIFileDictionary <int, KeyValuePair <string, StreamReader> > fileTable = state.getFileTable();
try
{
int val = exp_file_id.eval(symTbl);
fileTable.lookup(val);
StreamReader br = fileTable.get(val).Value;
String line = br.ReadLine();
int value, x;
if (line == null)
{
value = 0;
}
else
{
value = int.Parse(line);
}
if (symTbl.isDefined(var_name))
{
symTbl.update(var_name, value);
}
else
{
symTbl.add(var_name, value);
}
}
catch (MyException e)
{
throw new MyException("" + e);
}
return(state);
}
public PrgState execute(PrgState state)
{
MyIDictionary <string, int> symTbl = state.getSymTable();
MyIFileDictionary <int, KeyValuePair <string, StreamReader> > fileTable = state.getFileTable();
try
{
int val = exp_file_id.eval(symTbl);
KeyValuePair <string, StreamReader> p = fileTable.lookup(val);
StreamReader br = p.Value;
br.Close();
fileTable.remove(val); //not Sure
}
catch (MyException ex)
{
throw new MyException("" + ex);
}
return(state);
}