roSequenceMatcher

This object is used to send roSequenceMatchEvent events when the specified byte sequence patterns are matched. Once a pattern has been matched and the event has been posted, all contributing bytes are discarded. As a result, if one pattern is a prefix of another pattern, then the second, longer pattern will never be matched by the object.

This object provides both a standard interface and an overloaded interface for sending events to a message port.

ifMessagePort

SetPort(port As roMessagePort)

Posts messages of type roSequenceMatchEvent to the attached message port.

ifSequenceMatcher

SetPort(a As Object)

Specifies the message port where roSequenceMatchEvent objects will be posted.

Add(pattern As Object, user_data As Object) As Boolean

Adds a pattern to be matched by the roSequenceMatcher object instance. The pattern should be specified as an object that is convertible to a byte sequence (e.g. roByteArray, roString). For the user data, pass the object that should be returned if the specified pattern is matched.

Example

Function FromHex(hex as String) as Object
    bytes = CreateObject("roByteArray")
    bytes.FromHexString(hex)
    return bytes
End Function
 
Sub Main()
    serial = CreateObject("roSerialPort", 1, 115200)
    mp = CreateObject("roMessagePort")
 
    button1_seq = FromHex("080a01040001e000")
    button2_seq = FromHex("080e01040001e000")
 
    matcher = CreateObject("roSequenceMatcher")
    matcher.SetMessagePort(mp)
    matcher.Add(button1_seq, { name: "button1" })
    matcher.Add(button2_seq, { name: "button2" })
    matcher.Add("flibbet", { name: "flibbet" })
    matcher.Add("flobbet", { name: "flobbet" })
 
    if not serial.SetMatcher(matcher) then
       stop
    end if
 
    finished = false
    while not finished
       ev = mp.WaitMessage(10000)
       if ev = invalid then
           finished = true
       else if type(ev) = "roSequenceMatchEvent" then
           print "Got button: "; ev.GetUserData().name
       else
           print "Unexpected event: "; type(ev)
       end if
    end while
End Sub