# The RustOwl LSP specification `rustowl`, is an LSP server which provides RustOwl information. To display various types of decorations, RustOwl supports some custom methods from the client. Here, we describe the specifications of those custom methods. ## Types Here, we describe the types we will use in this document. ### `OprType` ```typescript "lifetime" | "imm_borrow" | "mut_borrow" | "move" | "call" | "outlive" | "shared_mut" ``` ### `Decoration`

{
    "type": OprType,
    "range": Range,
    "hover_text": Option<String>,
    "overlapped": bool
}

`overlapped` field indicates that the decoration is overlapped and should be hidden. ## Methods We describe the custom methods used in RustOwl. ### `rustowl/cursor` #### Request payload

{
    "position": Position,
    "document": {
        "uri": DocumentUri
    }
}

#### Response payload

{
    "is_analyzed": bool,
    "decorations": [Decoration]
}