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//! Trace verbosity level filtering.
//!
//! # Compile time filters
//!
//! Trace verbosity levels can be statically disabled at compile time via Cargo
//! features, similar to the [`log` crate]. Trace instrumentation at disabled
//! levels will be skipped and will not even be present in the resulting binary
//! unless the verbosity level is specified dynamically. This level is
//! configured separately for release and debug builds. The features are:
//!
//! * `max_level_off`
//! * `max_level_error`
//! * `max_level_warn`
//! * `max_level_info`
//! * `max_level_debug`
//! * `max_level_trace`
//! * `release_max_level_off`
//! * `release_max_level_error`
//! * `release_max_level_warn`
//! * `release_max_level_info`
//! * `release_max_level_debug`
//! * `release_max_level_trace`
//!
//! These features control the value of the `STATIC_MAX_LEVEL` constant. The
//! instrumentation macros macros check this value before recording an event or
//! constructing a span. By default, no levels are disabled.
//!
//! For example, a crate can disable trace level instrumentation in debug builds
//! and trace, debug, and info level instrumentation in release builds with the
//! following configuration:
//!
//! ```toml
//! [dependencies]
//! tracing = { version = "0.1", features = ["max_level_debug", "release_max_level_warn"] }
//! ```
//!
//! *Compiler support: requires rustc 1.39+*
//!
//! [`log` crate]: https://docs.rs/log/0.4.6/log/#compile-time-filters
pub use tracing_core::{metadata::ParseLevelFilterError, LevelFilter};

/// The statically configured maximum trace level.
///
/// See the [module-level documentation] for information on how to configure
/// this.
///
/// This value is checked by the `event!` and `span!` macros. Code that
/// manually constructs events or spans via the `Event::record` function or
/// `Span` constructors should compare the level against this value to
/// determine if those spans or events are enabled.
///
/// [module-level documentation]: ../index.html#compile-time-filters
pub const STATIC_MAX_LEVEL: LevelFilter = MAX_LEVEL;

cfg_if! {
    if #[cfg(all(not(debug_assertions), feature = "release_max_level_off"))] {
        const MAX_LEVEL: LevelFilter = LevelFilter::OFF;
    } else if #[cfg(all(not(debug_assertions), feature = "release_max_level_error"))] {
        const MAX_LEVEL: LevelFilter = LevelFilter::ERROR;
    } else if #[cfg(all(not(debug_assertions), feature = "release_max_level_warn"))] {
        const MAX_LEVEL: LevelFilter = LevelFilter::WARN;
    } else if #[cfg(all(not(debug_assertions), feature = "release_max_level_info"))] {
        const MAX_LEVEL: LevelFilter = LevelFilter::INFO;
    } else if #[cfg(all(not(debug_assertions), feature = "release_max_level_debug"))] {
        const MAX_LEVEL: LevelFilter = LevelFilter::DEBUG;
    } else if #[cfg(all(not(debug_assertions), feature = "release_max_level_trace"))] {
        const MAX_LEVEL: LevelFilter = LevelFilter::TRACE;
    } else if #[cfg(feature = "max_level_off")] {
        const MAX_LEVEL: LevelFilter = LevelFilter::OFF;
    } else if #[cfg(feature = "max_level_error")] {
        const MAX_LEVEL: LevelFilter = LevelFilter::ERROR;
    } else if #[cfg(feature = "max_level_warn")] {
        const MAX_LEVEL: LevelFilter = LevelFilter::WARN;
    } else if #[cfg(feature = "max_level_info")] {
        const MAX_LEVEL: LevelFilter = LevelFilter::INFO;
    } else if #[cfg(feature = "max_level_debug")] {
        const MAX_LEVEL: LevelFilter = LevelFilter::DEBUG;
    } else {
        const MAX_LEVEL: LevelFilter = LevelFilter::TRACE;
    }
}