Yes circular dependencies are possible and it works.
For example
message Tree {
message InnerNode {
Tree left = 1;
Tree right = 2;
}
oneof leaf_or_node {
int leaf = 1;
InnerNode node = 2;
}
}
is a valid and useful protobuf to store binary trees.
On Monday, July 18, 2016 at 10:25:41 AM UTC-7, Alan Thomas wrote:
>
> In the EBNF grammar for protocol buffers 3 (), there are circular
> references.
>
> For example, message refers to messageBody, but messageBody refers back to
> message. Unless I am missing something, this won`t work!
>
> I was trying to implement the grammar using the python pyparsing package
> and noticed this. Has someone already done this?
>
> message = "message" messageName messageBody
> messageBody = "{" { field | enum | message | option | oneof | mapField |
> reserved | emptyStatement } "}"
>
>
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