/// <summary>
/// Registers a scanner that scans received strings.
/// If a string matches the given pattern, the callback is invoked.
/// </summary>
/// <param name="pattern"></param>
/// <param name="callback"></param>
/// <returns></returns>
public CommandRegistry AddScanner(RegexString pattern, ScannerDelegate callback)
{
ThrowIfDisposed();
_queue.AddScanner(pattern, callback);
return(this);
}
private void PipeThreadCallback(string[] inputs, InputResultDelegate callback, IContextObject ctx)
{
object output = null;
for (int i = 0; i < inputs.Length; i++)
{
string input = $"{inputs[i]}".Trim();
CommandMetadata metadata;
lock (_lock)
{
//Lock the metadata collection, and grab the first metadata that has a matching executor
List <CommandMetadata> metadatas = _metadata.Where(m => m.GetFirstOrDefaultExecutorData(input) != null).ToList();
metadata = metadatas.FirstOrDefault();
}
if (metadata == null)
{
//No command matches, so ignore this entire piped input
callback.Invoke(InputResult.Unhandled, null);
break;
}
CommandExecutorData exeData = metadata.GetFirstOrDefaultExecutorData(input);
RegexString trigger = exeData.ExecutorAttribute.CommandMatcher;
input = trigger.RemoveMatchedString(input);
object[] arguments = null;
if (output != null)
{
//If there's output from a previous command, append it to the arguments for this command
arguments = new[] { output };
}
AbstractParser parser;
if (i == inputs.Length - 1)
{
//We only want the final parsing to invoke the parser callback
parser = _registry.GetParser(_registry, input, arguments, metadata, exeData, ctx, callback);
}
else
{
parser = _registry.GetParser(_registry, input, arguments, metadata, exeData, ctx, null);
}
//Threads are joined for synchronous behaviour. Running each command concurrently (and thus potentially out of order) will not work here.
Thread thread = parser.GetThread();
thread.Start();
thread.Join();
//Set output so that it's appended to the end of the next input
output = parser.Output;
}
}
internal ScannerData(RegexString pattern, ScannerDelegate callback)
{
Pattern = pattern;
Callback = callback;
}
private void ParserThreadCallback()
{
while (!_tokenSource.Token.IsCancellationRequested)
{
//Check if the MRE has been set
if (!_mre.WaitOne(100))
{
continue;
}
if (!_queue.TryDequeue(out QueueData data))
{
_mre.Reset();
continue;
}
//The vertical bar is a pipe character. inputA | inputB = run command B with the output of command A
string[] inputs = data.Input.Split('|');
if (inputs.Length > 1)
{
//If we have a piped command, send it off to a new thread to be handled,
//As each command needs to be handled in order
Thread pipeThread = new Thread(() => PipeThreadCallback(inputs, data.Callback, data.Context));
pipeThread.Start();
_mre.Set();
continue;
}
string input = data.Input; //We don't lower the data because case sensitivity is an option for command matching
CommandMetadata metadata;
lock (_lock)
{
//Lock the metadata collection, and grab the first metadata that has a matching executor
List <CommandMetadata> metadatas = _metadata.Where(m => m.GetFirstOrDefaultExecutorData(input) != null).ToList();
metadata = metadatas.FirstOrDefault();
}
if (metadata == null)
{
data.Callback?.Invoke(InputResult.Unhandled, null);
//No command matches, so ignore this input
_mre.Set();
continue;
}
CommandExecutorData exeData = metadata.GetFirstOrDefaultExecutorData(input);
RegexString trigger = exeData.ExecutorAttribute.CommandMatcher;
input = trigger.RemoveMatchedString(input).TrimStart();
AbstractParser parser = _registry.GetParser(_registry, input, null, metadata, exeData, data.Context, data.Callback);
try
{
parser.Start();
}
finally
{
//Our job is done, so prepare for the next input
_mre.Set();
}
}
_mre.Dispose();
}
/// <summary>
/// Adds a new scanner
/// </summary>
/// <param name="pattern">The scanner's pattern</param>
/// <param name="callback">The scanner's callback</param>
public void AddScanner(RegexString pattern, ScannerDelegate callback)
{
ThrowIfDisposed();
_scanners.Add(new ScannerData(pattern, callback));
}