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//! The capability set an agent advertises in its hello.
wire_flags! {
/// What an agent implements, advertised in its hello as a `u32` bitmask.
/// The host refuses a request whose method needs a capability the agent
/// did not advertise ([`crate::message::Method::required_capability`]).
pub struct Capabilities;
/// Tree reads: `snapshot`.
TREE = 0, "tree";
/// Input injection: `tap`, `swipe`, `key`.
INPUT = 1, "input";
/// Screenshots: `screenshot`.
SCREENSHOT = 2, "screenshot";
/// Frame streaming: `frames_start`, `frames_stop`.
FRAMES = 3, "frames";
/// Change events on the tree, window and lifecycle streams, and `resync`.
EVENTS = 4, "events";
/// Direct text setting: `text_set`.
TEXT_SET = 5, "text_set";
/// Nodes' bounds read again past the platform's node cache: `bounds`.
BOUNDS = 6, "bounds";
}
impl Capabilities {
/// The empty set.
pub const NONE: Capabilities = Capabilities::EMPTY;
/// A human description of the capabilities in `self`, such as
/// `frame streaming`, for error messages.
pub fn label(self) -> String {
const LABELS: [(Capabilities, &str); 7] = [
(Capabilities::TREE, "tree reads"),
(Capabilities::INPUT, "input injection"),
(Capabilities::SCREENSHOT, "screenshots"),
(Capabilities::FRAMES, "frame streaming"),
(Capabilities::EVENTS, "change events"),
(Capabilities::TEXT_SET, "direct text setting"),
(Capabilities::BOUNDS, "bounds probes"),
];
let labels: Vec<&str> = LABELS
.iter()
.filter(|(cap, _)| self.contains(*cap))
.map(|(_, label)| *label)
.collect();
if labels.is_empty() {
self.to_string()
} else {
labels.join(" and ")
}
}
}