This is a parser which accepts control-plane commands, for example insert_entry which should be executed by the switch. It's a complete rewrite of the old MatchActionConfig.cpp hand-written parser to be easier to understand and to extend, and less brittle.

Adding new commands

Adding new commands should be relatively straightforward.

• Create a new subclass of Command to represent your command
  • Don't forget to override the process function. For convenience this can be done with the OVERRIDE_PROCESS macro in the class declaration, and by the PROCESS macro in the .cpp file
• Register your command with the ControlPlaneAgent interface by adding a DECLARE_PROCESS line.
• In grammar.y:
  • Create a polymorphic type for your command in the main polymorphic section.
  • Create a token for your command and associate it to your type in the Terminal types section.
  • Create a production for your command. Follow the examples of insert_entry_command and the other pre-existing commands.
  • Add your command grammar rule to the overall command production.
• In tokens.l create a new reserved word for the command. Look at the insert_entry for an example.
• That's it.