public override int eval(ImyDict <string, int> sym)
{
try
{
return(sym.get(name));
}
catch (Exception) {
throw new ExpException("Variable " + name + " is not in the sym table\n");
}
}
public void execute(PrgState state)
{
ImyDict <string, int> symTable = state.getSymTable();
ImyDict <int, Tuple <string, StreamReader> > fileTable = state.getFileTable();
int v;
StreamReader buffReader;
try {
v = exp_file_id.eval(symTable);
} catch (ExpException e) {
throw new StmtException("Expression \"" + exp_file_id + "\" in statement + \"" + this.ToString() + "\" is invalid: " + e.Message);
}
try {
buffReader = fileTable.get(v).Item2;
} catch (Exception) {
throw new StmtException("File does not exist or hasn't been open \"" + exp_file_id.ToString() + "\"");
}
try {
string readValue = buffReader.ReadLine();
int value;
if (readValue == null)
{
value = 0;
}
else
{
Int32.TryParse(readValue, out value);
}
symTable.add(var_name, value);
} catch (IOException e2) {
throw new StmtException("Statement \"" + this.ToString() + "\" encountered an exception: " + e2.Message);
}
}
public PrgState execute(PrgState state)
{
ImyDict <String, int> symTable = state.getSymTable();
ImyDict <int, Tuple <String, StreamReader> > fileTable = state.getFileTable();
int v;
StreamReader buffReader;
try {
v = exp_file_id.eval(symTable);
} catch (ExpException e) {
throw new StmtException("Expression \"" + exp_file_id + "\" in statement + \"" + this.ToString() + "\" is invalid: " + e.Message);
}
try {
buffReader = fileTable.get(v).Item2;
buffReader.Close();
fileTable.remove(v);
} catch (Exception) {
throw new StmtException("File does not exist or hasn't been open");
}
return(null);
}
