parser

type Field struct {
	Name string
	Type *Type
	Num  int
}

type Message struct {
	Name   string
	Fields []*Field
}

type RPC struct {
	Name         string
	Request      *Message
	Response     *Message
	Descriptions []string
}

type Service struct {
	Name         string
	RPCs         []*RPC
	Descriptions []string
}

type Type struct {
	Name     string
	Repeated bool     // true for slice: []Type
	MapKey   string   // non-empty for map: map[key]Type
	Fields   []*Field // non-empty for struct
}