Crate bern_macros 

Procedural macros for Bern declarations.

The macros parse with bern-syntax, the same parser the build tool uses, check declarations against the shared component specifications and expand them into Rust that rustc type-checks. They never generate UI code: targets do that from the collected description.

Macros

style

The application’s style overrides and motion tokens. The build tool reads and checks them; for rustc the declaration only has to parse.

tr

Localized text. Only valid inside ui! and #[label(...)].

ui

The UI declaration grammar. Only valid as the body of a #[component].

Attribute Macros

component

Declare an exportable component whose body is one ui! declaration. #[component(features = X)] makes the component the scope of the feature contract X.

features

Declare a feature contract: what users can do within a component’s scope, and the commands each feature is implemented by.

players

Declare the media players owned by the application. Every field is a Player; its name is the stable player_id all entries use.

protocol

Declare an application protocol: value types, a read-only state struct and a command trait.

session

Declare typed session state owned by the window hosting a component.

value

Declare an enum or record used by UI declarations outside a protocol.