meyfa/selena-ide

@top Sequence { (ObjectDefinition | Message)* }

ObjectDefinition {
  ObjectKeyword options? ObjectName "=" String
}
ObjectName { identifier }
Outside { outsideIdentifier }

options { "(" Option* ")" }
Option { identifier }

Message {
  Outside? Arrow options? (Outside | ObjectName) String? MessageBlock?
}

ReturnStatement {
  ReturnKeyword String?
}

MessageBlock { "{" Message* ReturnStatement? "}" }

@tokens {
  String { '"' !["\r\n]* '"' }

  identifier { $[a-zA-Z_0-9]+ }
  outsideIdentifier { "*" }

  LineComment { "#" ![\n]* }

  Arrow { "->" }

  ObjectKeyword { "object" }
  ReturnKeyword { "return" }

  whitespace { @whitespace+ }

  "(" ")"

  "{" "}"

  "="
}

@skip { whitespace | LineComment }

@detectDelim