protected bool TryMakeProxyFromAndToAddresses(TryMakeDelegate <string> @delegate, out IPAddress fromIp,
out IPAddress toIp)
{
fromIp = null;
toIp = null;
if (TryMake(@delegate, out var fromAddress) == false)
{
return(false);
}
if (!IPAddress.TryParse(fromAddress, out fromIp))
{
return(false);
}
Enumerator.Skip(TokenKind.Space);
if (TryMake(@delegate, out var toAddress) == false)
{
return(false);
}
if (!IPAddress.TryParse(toAddress, out toIp))
{
return(false);
}
return(true);
}
private static bool TryMake <T>(TokenEnumerator enumerator, TryMakeDelegate <T> make, out T found)
{
int index = enumerator.Index;
if (make(enumerator, out found))
{
return(true);
}
enumerator.Index = index;
return(false);
}
/// <summary>
/// Try to make a callback in a transactional way.
/// </summary>
/// <param name="delegate">The callback to perform the match.</param>
/// <returns>true if the match could be made, false if not.</returns>
protected bool TryMake(TryMakeDelegate @delegate)
{
var checkpoint = Enumerator.Checkpoint();
if (@delegate() == false)
{
checkpoint.Rollback();
return(false);
}
checkpoint.Dispose();
return(true);
}
/// <summary>
/// Try to make a callback in a transactional way.
/// </summary>
/// <param name="delegate">The callback to perform the match.</param>
/// <param name="found">The parameter that was returned from the matching function.</param>
/// <returns>true if the match could be made, false if not.</returns>
protected bool TryMake <TOut>(TryMakeDelegate <TOut> @delegate, out TOut found)
{
var checkpoint = Enumerator.Checkpoint();
if (@delegate(out found) == false)
{
checkpoint.Rollback();
return(false);
}
checkpoint.Dispose();
return(true);
}
/// <summary>
/// Try to match a function on the enumerator ensuring that the enumerator is restored on failure.
/// </summary>
/// <param name="enumerator">The enumerator to attempt to match on.</param>
/// <param name="make">The callback function to match on the enumerator.</param>
/// <param name="found">The out value that was found.</param>
/// <returns>true if the matching function successfully made a match, false if not.</returns>
static bool TryMake <T>(TokenEnumerator enumerator, TryMakeDelegate <T> make, out T found)
{
using (var checkpoint = enumerator.Checkpoint())
{
if (make(enumerator, out found))
{
return(true);
}
checkpoint.Rollback();
}
return(false);
}
/// <summary>
/// Try to make a callback in a transactional way.
/// </summary>
/// <param name="delegate">The callback to perform the match.</param>
/// <returns>true if the match could be made, false if not.</returns>
public bool TryMake(TryMakeDelegate @delegate)
{
var span = _span;
var spanIndex = _spanIndex;
var spanPosition = _spanPosition;
if (@delegate(ref this) == false)
{
_span = span;
_spanIndex = spanIndex;
_spanPosition = spanPosition;
_hasPeeked = false;
return(false);
}
return(true);
}
/// <summary>
/// Try to make a callback in a transactional way.
/// </summary>
/// <param name="delegate">The callback to perform the match.</param>
/// <param name="value1">The first out parameter that was found during the make operation.</param>
/// <param name="value2">The second out parameter that was found during the make operation.</param>
/// <returns>true if the match could be made, false if not.</returns>
public bool TryMake <TOut1, TOut2>(TryMakeDelegate <TOut1, TOut2> @delegate, out TOut1 value1, out TOut2 value2)
{
if (_buffer.IsSingleSegment)
{
var index = _spanIndex;
if (@delegate(ref this, out value1, out value2) == false)
{
_spanIndex = index;
_hasPeeked = false;
return(false);
}
return(true);
}
throw new NotImplementedException();
}
/// <summary>
/// Try to make a callback in a transactional way.
/// </summary>
/// <param name="delegate">The callback to perform the match.</param>
/// <param name="found">The parameter that was returned from the matching function.</param>
/// <returns>true if the match could be made, false if not.</returns>
public bool TryMake <TOut>(TryMakeDelegate <TOut> @delegate, out TOut found)
{
var span = _span;
var spanIndex = _spanIndex;
var spanPosition = _spanPosition;
if (@delegate(ref this, out found) == false)
{
_span = span;
_spanIndex = spanIndex;
_spanPosition = spanPosition;
_hasPeeked = false;
return(false);
}
return(true);
}
/// <summary>
/// Try to make a callback in a transactional way.
/// </summary>
/// <param name="delegate">The callback to perform the match.</param>
/// <param name="buffer">The buffer that was made.</param>
/// <returns>true if the match could be made, false if not.</returns>
public bool TryMake(TryMakeDelegate @delegate, out ReadOnlySequence <byte> buffer)
{
buffer = default;
var span = _span;
var spanIndex = _spanIndex;
var spanPosition = _spanPosition;
if (@delegate(ref this) == false)
{
_span = span;
_spanIndex = spanIndex;
_spanPosition = spanPosition;
_hasPeeked = false;
return(false);
}
buffer = _buffer.Slice(spanIndex, _spanIndex - spanIndex);
return(true);
}
/// <summary>
/// Constructor.
/// </summary>
/// <param name="delegate">The delegate to match the input.</param>
/// <param name="transition">The transition function to move from the previous state to the new state.</param>
public StateTransition(TryMakeDelegate @delegate, Func <SmtpSessionContext, SmtpState> transition)
{
Delegate = @delegate;
Transition = transition;
}
/// <summary>
/// Add a state action.
/// </summary>
/// <param name="command">The name of the SMTP command.</param>
/// <param name="tryMake">The function callback to create the command.</param>
/// <param name="transitionTo">The state to transition to.</param>
public void Replace(string command, TryMakeDelegate tryMake, SmtpState?transitionTo = null)
{
Remove(command);
Add(command, tryMake, transitionTo ?? StateId);
}
/// <summary>
/// Add a state action.
/// </summary>
/// <param name="command">The name of the SMTP command.</param>
/// <param name="tryMake">The function callback to create the command.</param>
/// <param name="transition">The function to determine the new state.</param>
public void Add(string command, TryMakeDelegate tryMake, Func <SmtpSessionContext, SmtpState> transition)
{
Transitions.Add(command, new StateTransition(tryMake, transition));
}
/// <summary>
/// Add a state action.
/// </summary>
/// <param name="command">The name of the SMTP command.</param>
/// <param name="tryMake">The function callback to create the command.</param>
/// <param name="transition">The state to transition to.</param>
public void Add(string command, TryMakeDelegate tryMake, SmtpState transition)
{
Add(command, tryMake, context => transition);
}
/// <summary>
/// Add a state action.
/// </summary>
/// <param name="command">The name of the SMTP command.</param>
/// <param name="tryMake">The function callback to create the command.</param>
public void Add(string command, TryMakeDelegate tryMake)
{
Add(command, tryMake, context => StateId);
}
/// <summary>
/// Add a state action.
/// </summary>
/// <param name="command">The name of the SMTP command.</param>
/// <param name="tryMake">The function callback to create the command.</param>
/// <param name="transitionTo">The state to transition to.</param>
public void Add(string command, TryMakeDelegate tryMake, SmtpState?transitionTo = null)
{
Actions.Add(command, Tuple.Create(tryMake, transitionTo ?? StateId));
}
/// <summary>
/// Add a state action.
/// </summary>
/// <param name="command">The name of the SMTP command.</param>
/// <param name="tryMake">The function callback to create the command.</param>
/// <param name="transitionTo">The state to transition to.</param>
public void Add(string command, TryMakeDelegate tryMake, SmtpState? transitionTo = null)
{
Actions.Add(command, Tuple.Create(tryMake, transitionTo ?? StateId));
}
