public void PrintMenu()
{
foreach (Command com in commands.Values())
{
String line = " " + com.GetKey() + ": " + com.GetDescription();
Console.WriteLine(line);
}
}
public ProgramState Execute(ProgramState state)
{
MyIDictionary <int, MyPair <string, StreamReader> > fileTable = state.GetFileTab();
MyIDictionary <string, int> symTable = state.GetSymTab();
// 1. check whether the filename is not already in the file table
// If it exists stop the execution with an appropiate error message
foreach (MyPair <string, StreamReader> pair in fileTable.Values())
{
if (pair.GetFirst().Equals(filename))
{
throw new MyStatementExecutionException("File " + filename + " already open.");
}
}
// 2. open the file filename. If the file does not exists or other IO error occurs,
// stop the execution with an appropiate error message
StreamReader sr;
try
{
sr = new StreamReader(filename);
}
catch (FileNotFoundException)
{
throw new MyStatementExecutionException("File " + filename + " does not exist");
}
catch (IOException e)
{
throw new MyStatementExecutionException(e.ToString());
}
// 3. create a new entrance into the file table which maps a new unique integer id
// to the (filename, StreamReader class created before) pair
fileTable.Put(++fd, new MyPair <string, StreamReader>(filename, sr));
// 4. set the var_file_id to that new unique integer key into the sym-table.
symTable.Put(var_file_id, fd);
// 5. return
return(null);
}
public PrgState Execute(PrgState state)
{
MyIDictionary <int, MyPair <String, StreamReader> > fileTable = state.GetFileTable();
foreach (MyIPair <String, StreamReader> ff in fileTable.Values())
{
if (ff.GetFirst().Equals(this.filename))
{
throw new MyException("File already used");
}
}
MyIDictionary <String, int> symTable = state.GetSymTable();
StreamReader streamReader = new StreamReader(this.filename);
int unq = ran++;
MyPair <String, StreamReader> tup = new MyPair <String, StreamReader>(this.filename, streamReader);
fileTable.Add(unq, tup);
symTable.Add(var_file_id, unq);
return(state);
}
