public ProcessorState(Stream source, Stream target, int bufferSize, int flushThreshold, IEngineConfig config, IReadOnlyList <IOperationProvider> operationProviders)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (target == null)
{
throw new ArgumentNullException(nameof(target));
}
if (config == null)
{
throw new ArgumentNullException(nameof(config));
}
if (operationProviders == null)
{
throw new ArgumentNullException(nameof(operationProviders));
}
if (source.CanSeek)
{
try
{
if (source.Length < bufferSize)
{
bufferSize = (int)source.Length;
}
}
catch
{
//The stream may not support getting the length property (in NetworkStream for instance, which throw a NotSupportedException), suppress any errors in
// accessing the property and continue with the specified buffer size
}
}
//Buffer has to be at least as large as the largest BOM we could expect
else if (bufferSize < 4)
{
bufferSize = 4;
}
_source = source;
_target = target;
Config = config;
_flushThreshold = flushThreshold;
CurrentBuffer = new byte[bufferSize];
CurrentBufferLength = ReadExactBytes(source, CurrentBuffer, 0, CurrentBuffer.Length);
Encoding encoding = EncodingUtil.Detect(CurrentBuffer, CurrentBufferLength, out byte[] bom);
EncodingConfig = new EncodingConfig(Config, encoding);
_bomSize = bom.Length;
CurrentBufferPosition = _bomSize;
CurrentSequenceNumber = _bomSize;
target.Write(bom, 0, _bomSize);
bool explicitOnConfigurationRequired = false;
Dictionary <Encoding, Trie <OperationTerminal> > byEncoding = TrieLookup.GetOrAdd(operationProviders, x => new Dictionary <Encoding, Trie <OperationTerminal> >());
List <string> turnOnByDefault = OperationsToExplicitlySetOnByDefault.GetOrAdd(operationProviders, x =>
{
explicitOnConfigurationRequired = true;
return(new List <string>());
});
if (!byEncoding.TryGetValue(encoding, out Trie <OperationTerminal> trie))
{
trie = new Trie <OperationTerminal>();
for (int i = 0; i < operationProviders.Count; ++i)
{
IOperation op = operationProviders[i].GetOperation(encoding, this);
if (op != null)
{
for (int j = 0; j < op.Tokens.Count; ++j)
{
if (op.Tokens[j] != null)
{
trie.AddPath(op.Tokens[j].Value, new OperationTerminal(op, j, op.Tokens[j].Length, op.Tokens[j].Start, op.Tokens[j].End));
}
}
if (explicitOnConfigurationRequired && op.IsInitialStateOn && !string.IsNullOrEmpty(op.Id))
{
turnOnByDefault.Add(op.Id);
}
}
}
byEncoding[encoding] = trie;
}
foreach (string state in turnOnByDefault)
{
config.Flags[state] = true;
}
_trie = new TrieEvaluator <OperationTerminal>(trie);
if (bufferSize < _trie.MaxLength + 1)
{
byte[] tmp = new byte[_trie.MaxLength + 1];
Buffer.BlockCopy(CurrentBuffer, CurrentBufferPosition, tmp, 0, CurrentBufferLength - CurrentBufferPosition);
int nRead = ReadExactBytes(_source, tmp, CurrentBufferLength - CurrentBufferPosition, tmp.Length - CurrentBufferLength);
CurrentBuffer = tmp;
CurrentBufferLength += nRead - _bomSize;
CurrentBufferPosition = 0;
CurrentSequenceNumber = 0;
}
}
