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//! [`Layer`]s that control which spans and events are enabled by the wrapped
//! subscriber.
//!
//! This module contains a number of types that provide implementations of
//! various strategies for filtering which spans and events are enabled. For
//! details on filtering spans and events using [`Layer`]s, see the
//! [`layer` module's documentation].
//!
//! [`layer` module's documentation]: crate::layer#filtering-with-layers
//! [`Layer`]: crate::layer
mod filter_fn;
feature! {
#![all(feature = "env-filter", feature = "std")]
mod env;
pub use self::env::*;
}
feature! {
#![all(feature = "registry", feature = "std")]
mod layer_filters;
pub use self::layer_filters::*;
}
mod level;
pub use self::filter_fn::*;
pub use self::level::{LevelFilter, ParseError as LevelParseError};
#[cfg(not(all(feature = "registry", feature = "std")))]
pub(crate) use self::has_plf_stubs::*;
feature! {
#![any(feature = "std", feature = "alloc")]
pub mod targets;
pub use self::targets::Targets;
mod directive;
pub use self::directive::ParseError;
}
/// Stub implementations of the per-layer-fitler detection functions for when the
/// `registry` feature is disabled.
#[cfg(not(all(feature = "registry", feature = "std")))]
mod has_plf_stubs {
pub(crate) fn is_plf_downcast_marker(_: core::any::TypeId) -> bool {
false
}
/// Does a type implementing `Subscriber` contain any per-layer filters?
pub(crate) fn subscriber_has_plf<S>(_: &S) -> bool
where
S: tracing_core::Subscriber,
{
false
}
/// Does a type implementing `Layer` contain any per-layer filters?
pub(crate) fn layer_has_plf<L, S>(_: &L) -> bool
where
L: crate::Layer<S>,
S: tracing_core::Subscriber,
{
false
}
}
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