public ProgramState Execute(ProgramState programState) { MyIDictionary <string, int> symbolTable = programState.SymbolTable; int value = expression.Evaluate(symbolTable); if (symbolTable.ContainsKey(id)) { symbolTable.Update(id, value); } else { symbolTable.Add(id, value); } return(programState); }
public ProgramState Execute(ProgramState programState) { MyIDictionary <string, int> symbolTable = programState.SymbolTable; int fileDescriptor = expFileId.Evaluate(symbolTable); if (!programState.FileTable.TryGetValue(fileDescriptor, out Tuple <string, TextReader> value)) { throw new StatementException("Invalid file id provided!"); } TextReader reader = value.Item2; string line; try { line = reader.ReadLine(); }catch (Exception) { throw new StatementException("Error while reading from file!"); } int intValue = 0; if (line != null && !int.TryParse(line, out intValue)) { throw new StatementException("File contains non-numeric values!"); } if (symbolTable.ContainsKey(varName)) { symbolTable.Update(varName, intValue); } else { symbolTable.Add(varName, intValue); } return(programState); }