// parseGroup parses information about a group from a message
// received at /g_queryTree
// it *does not* recursively query for child groups
func parseGroup(msg *osc.Message) (*Group, error) {
// return an error if msg.Address is not right
if msg.Address() != gQueryTreeReply {
return nil, fmt.Errorf("msg.Address should be %s, got %s", gQueryTreeReply, msg.Address())
}
// g_queryTree replies should have at least 3 arguments
g, numArgs := new(Group), msg.CountArguments()
if numArgs < 3 {
return nil, fmt.Errorf("expected 3 arguments for message, got %d", numArgs)
}
// get the id of the group this reply is for
nodeID, err := msg.ReadInt32()
if err != nil {
return nil, err
}
g.Node.id = nodeID
// initialize the children array
numChildren, err := msg.ReadInt32()
if err != nil {
return nil, err
}
if numChildren < 0 {
return nil, fmt.Errorf("expected numChildren >= 0, got %d", numChildren)
}
g.children = make([]*Node, numChildren)
// get the childrens' ids
var numControls, numSubChildren int32
for i := 3; i < numArgs; {
nodeID, err = msg.ReadInt32()
if err != nil {
return nil, err
}
g.children[i-3] = &Node{nodeID}
// get the number of children of this node
// if -1 this is a synth, if >= 0 this is a group
numSubChildren, err = msg.ReadInt32()
if err != nil {
return nil, err
}
if numSubChildren == -1 {
// synth
i += 3
numControls, err = msg.ReadInt32()
if err != nil {
return nil, err
}
i += 1 + int(numControls*2)
} else if numSubChildren >= 0 {
// group
i += 2
}
}
return g, nil
}
