internal Expression Build(Expression source)
{
var parameterType = source.Type.GetGenericArguments()[0];
if (parameterType != typeof(Message))
{
source = Expression.Call(typeof(Parse), nameof(Convert), null, source);
}
var address = Address;
if (!string.IsNullOrEmpty(address))
{
source = Expression.Call(typeof(Parse), nameof(Filter), null, source, Expression.Constant(address));
}
var typeTag = TypeTag;
if (string.IsNullOrEmpty(typeTag))
{
return(source);
}
else
{
var readerParameter = Expression.Parameter(typeof(BinaryReader));
var parseMessage = MessageParser.Content(typeTag, readerParameter);
var messageParser = Expression.Lambda(parseMessage, readerParameter);
return(Expression.Call(typeof(Parse), nameof(Process), new[] { messageParser.ReturnType }, source, messageParser));
}
}
protected override Expression BuildSelector(Expression expression)
{
var readerParameter = Expression.Parameter(typeof(BinaryReader));
var builder = Expression.Constant(this);
if (string.IsNullOrEmpty(TypeTag))
{
return(expression);
}
else
{
var parseMessage = MessageParser.Content(TypeTag, readerParameter);
var messageParser = Expression.Lambda(parseMessage, readerParameter);
return(Expression.Call(builder, "Process", new[] { messageParser.ReturnType }, expression, messageParser));
}
}
protected override Expression BuildCombinator(IEnumerable <Expression> arguments)
{
var readerParameter = Expression.Parameter(typeof(BinaryReader));
var builder = Expression.Constant(this);
if (string.IsNullOrEmpty(TypeTag))
{
return(Expression.Call(builder, "Generate", null));
}
else
{
var parseMessage = MessageParser.Content(TypeTag, readerParameter);
var messageParser = Expression.Lambda(parseMessage, readerParameter);
return(Expression.Call(builder, "Generate", new[] { messageParser.ReturnType }, messageParser));
}
}