public ProgState execute(ProgState programState)
{
try
{
int descriptor = fileDescriptor.evaluate(programState.getSymbolTable);
FileTable <int, FileData> fileTable = programState.getFileTable;
StreamReader bufferedReader = fileTable.getValue(descriptor).Buffer;
string line = bufferedReader.ReadLine();
ConstExpr value;
if (line == null)
{
value = new ConstExpr(0);
}
else
{
value = new ConstExpr(int.Parse(line));
}
Statement assignment = new AssignStmt(variable, value);
return(assignment.execute(programState));
}
catch (IOException)
{
throw (new InterpreterException("error: file could not be read"));
}
}
public ProgState execute(ProgState state)
{
SymbolTable <string, int> table = state.getSymbolTable;
Output <int> outs = state.getOutput;
outs.add(exp.evaluate(table));
return(state);
}
public ProgState execute(ProgState state)
{
ExeStack <Statement> stack = state.getExeStack;
stack.push(stm2);
stack.push(stm1);
return(state);
}
public ProgState execute(ProgState state)
{
SymbolTable <string, int> table = state.getSymbolTable;
int val = exp.evaluate(table);
table.add(name, val);
return(state);
}
public ProgState execute(ProgState state)
{
ExeStack <Statement> stack = state.getExeStack;
SymbolTable <string, int> table = state.getSymbolTable;
int val = exp.evaluate(table);
if (val != 0)
{
stack.push(stm1);
}
else
{
stack.push(stm2);
}
return(state);
}
public ProgState execute(ProgState programState)
{
try
{
int descriptor = fileDescriptor.evaluate(programState.getSymbolTable);
FileTable <int, FileData> fileTable = programState.getFileTable;
StreamReader bufferedReader = fileTable.getValue(descriptor).Buffer;
bufferedReader.Close();
fileTable.remove(descriptor);
return(programState);
}
catch (IOException)
{
throw (new InterpreterException("error: file could not be closed"));
}
}
public ProgState execute(ProgState state)
{
FileTable <int, FileData> fileT = state.getFileTable;
if (isOpen(fileName, fileT))
{
throw new InterpreterException("error: file could not be open");
}
try
{
StreamReader bufferedReader = new StreamReader(fileName);
FileData fd = new FileData(fileName, bufferedReader);
int id = Generator.generator();
SymbolTable <string, int> symT = state.getSymbolTable;
fileT.add(id, fd);
symT.add(fileId, id);
}
catch (IOException e)
{
throw new InterpreterException("error: file could not be open");
}
return(state);
}