<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source to the Rust file `/home/asaka/.cargo/registry/src/github.com-1ecc6299db9ec823/log-0.4.6/src/lib.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>lib.rs.html -- source</title><link rel="stylesheet" type="text/css" href="../../normalize.css"><link rel="stylesheet" type="text/css" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../../dark.css"><link rel="stylesheet" type="text/css" href="../../light.css" id="themeStyle"><script src="../../storage.js"></script><link rel="shortcut icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../../log/index.html'><img src='https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png' alt='logo' width='100'></a></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><a id="settings-menu" href="../../settings.html"><img src="../../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><pre class="line-numbers"><span id="1"> 1</span>
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</pre><pre class="rust ">
<span class="comment">// Copyright 2015 The Rust Project Developers. See the COPYRIGHT</span>
<span class="comment">// file at the top-level directory of this distribution and at</span>
<span class="comment">// http://rust-lang.org/COPYRIGHT.</span>
<span class="comment">//</span>
<span class="comment">// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or</span>
<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license</span>
<span class="comment">// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your</span>
<span class="comment">// option. This file may not be copied, modified, or distributed</span>
<span class="comment">// except according to those terms.</span>
<span class="doccomment">//! A lightweight logging facade.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The `log` crate provides a single logging API that abstracts over the</span>
<span class="doccomment">//! actual logging implementation. Libraries can use the logging API provided</span>
<span class="doccomment">//! by this crate, and the consumer of those libraries can choose the logging</span>
<span class="doccomment">//! implementation that is most suitable for its use case.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! If no logging implementation is selected, the facade falls back to a "noop"</span>
<span class="doccomment">//! implementation that ignores all log messages. The overhead in this case</span>
<span class="doccomment">//! is very small - just an integer load, comparison and jump.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! A log request consists of a _target_, a _level_, and a _body_. A target is a</span>
<span class="doccomment">//! string which defaults to the module path of the location of the log request,</span>
<span class="doccomment">//! though that default may be overridden. Logger implementations typically use</span>
<span class="doccomment">//! the target to filter requests based on some user configuration.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Use</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The basic use of the log crate is through the five logging macros: [`error!`],</span>
<span class="doccomment">//! [`warn!`], [`info!`], [`debug!`] and [`trace!`]</span>
<span class="doccomment">//! where `error!` represents the highest-priority log messages</span>
<span class="doccomment">//! and `trace!` the lowest. The log messages are filtered by configuring</span>
<span class="doccomment">//! the log level to exclude messages with a lower priority.</span>
<span class="doccomment">//! Each of these macros accept format strings similarly to [`println!`].</span>
<span class="doccomment">//!</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`error!`]: ./macro.error.html</span>
<span class="doccomment">//! [`warn!`]: ./macro.warn.html</span>
<span class="doccomment">//! [`info!`]: ./macro.info.html</span>
<span class="doccomment">//! [`debug!`]: ./macro.debug.html</span>
<span class="doccomment">//! [`trace!`]: ./macro.trace.html</span>
<span class="doccomment">//! [`println!`]: https://doc.rust-lang.org/stable/std/macro.println.html</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## In libraries</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Libraries should link only to the `log` crate, and use the provided</span>
<span class="doccomment">//! macros to log whatever information will be useful to downstream consumers.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ### Examples</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! # #![allow(unstable)]</span>
<span class="doccomment">//! #[macro_use]</span>
<span class="doccomment">//! extern crate log;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # #[derive(Debug)] pub struct Yak(String);</span>
<span class="doccomment">//! # impl Yak { fn shave(&mut self, _: u32) {} }</span>
<span class="doccomment">//! # fn find_a_razor() -> Result<u32, u32> { Ok(1) }</span>
<span class="doccomment">//! pub fn shave_the_yak(yak: &mut Yak) {</span>
<span class="doccomment">//! info!(target: "yak_events", "Commencing yak shaving for {:?}", yak);</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! loop {</span>
<span class="doccomment">//! match find_a_razor() {</span>
<span class="doccomment">//! Ok(razor) => {</span>
<span class="doccomment">//! info!("Razor located: {}", razor);</span>
<span class="doccomment">//! yak.shave(razor);</span>
<span class="doccomment">//! break;</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! Err(err) => {</span>
<span class="doccomment">//! warn!("Unable to locate a razor: {}, retrying", err);</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! # fn main() {}</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ## In executables</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Executables should choose a logging implementation and initialize it early in the</span>
<span class="doccomment">//! runtime of the program. Logging implementations will typically include a</span>
<span class="doccomment">//! function to do this. Any log messages generated before</span>
<span class="doccomment">//! the implementation is initialized will be ignored.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The executable itself may use the `log` crate to log as well.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ### Warning</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The logging system may only be initialized once.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Available logging implementations</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! In order to produce log output executables have to use</span>
<span class="doccomment">//! a logger implementation compatible with the facade.</span>
<span class="doccomment">//! There are many available implementations to choose from,</span>
<span class="doccomment">//! here are some of the most popular ones:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * Simple minimal loggers:</span>
<span class="doccomment">//! * [env_logger]</span>
<span class="doccomment">//! * [simple_logger]</span>
<span class="doccomment">//! * [simplelog]</span>
<span class="doccomment">//! * [pretty_env_logger]</span>
<span class="doccomment">//! * [stderrlog]</span>
<span class="doccomment">//! * [flexi_logger]</span>
<span class="doccomment">//! * Complex configurable frameworks:</span>
<span class="doccomment">//! * [log4rs]</span>
<span class="doccomment">//! * [fern]</span>
<span class="doccomment">//! * Adaptors for other facilities:</span>
<span class="doccomment">//! * [syslog]</span>
<span class="doccomment">//! * [slog-stdlog]</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Implementing a Logger</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Loggers implement the [`Log`] trait. Here's a very basic example that simply</span>
<span class="doccomment">//! logs all messages at the [`Error`][level_link], [`Warn`][level_link] or</span>
<span class="doccomment">//! [`Info`][level_link] levels to stdout:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! extern crate log;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! use log::{Record, Level, Metadata};</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! struct SimpleLogger;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! impl log::Log for SimpleLogger {</span>
<span class="doccomment">//! fn enabled(&self, metadata: &Metadata) -> bool {</span>
<span class="doccomment">//! metadata.level() <= Level::Info</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn log(&self, record: &Record) {</span>
<span class="doccomment">//! if self.enabled(record.metadata()) {</span>
<span class="doccomment">//! println!("{} - {}", record.level(), record.args());</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! fn flush(&self) {}</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # fn main() {}</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Loggers are installed by calling the [`set_logger`] function. The maximum</span>
<span class="doccomment">//! log level also needs to be adjusted via the [`set_max_level`] function. The</span>
<span class="doccomment">//! logging facade uses this as an optimization to improve performance of log</span>
<span class="doccomment">//! messages at levels that are disabled. It's important to set it, as it</span>
<span class="doccomment">//! defaults to [`Off`][filter_link], so no log messages will ever be captured!</span>
<span class="doccomment">//! In the case of our example logger, we'll want to set the maximum log level</span>
<span class="doccomment">//! to [`Info`][filter_link], since we ignore any [`Debug`][level_link] or</span>
<span class="doccomment">//! [`Trace`][level_link] level log messages. A logging implementation should</span>
<span class="doccomment">//! provide a function that wraps a call to [`set_logger`] and</span>
<span class="doccomment">//! [`set_max_level`], handling initialization of the logger:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! # extern crate log;</span>
<span class="doccomment">//! # use log::{Level, Metadata};</span>
<span class="doccomment">//! # struct SimpleLogger;</span>
<span class="doccomment">//! # impl log::Log for SimpleLogger {</span>
<span class="doccomment">//! # fn enabled(&self, _: &Metadata) -> bool { false }</span>
<span class="doccomment">//! # fn log(&self, _: &log::Record) {}</span>
<span class="doccomment">//! # fn flush(&self) {}</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! # fn main() {}</span>
<span class="doccomment">//! use log::{SetLoggerError, LevelFilter};</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! static LOGGER: SimpleLogger = SimpleLogger;</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! pub fn init() -> Result<(), SetLoggerError> {</span>
<span class="doccomment">//! log::set_logger(&LOGGER)</span>
<span class="doccomment">//! .map(|()| log::set_max_level(LevelFilter::Info))</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Implementations that adjust their configurations at runtime should take care</span>
<span class="doccomment">//! to adjust the maximum log level as well.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Use with `std`</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! `set_logger` requires you to provide a `&'static Log`, which can be hard to</span>
<span class="doccomment">//! obtain if your logger depends on some runtime configuration. The</span>
<span class="doccomment">//! `set_boxed_logger` function is available with the `std` Cargo feature. It is</span>
<span class="doccomment">//! identical to `set_logger` except that it takes a `Box<Log>` rather than a</span>
<span class="doccomment">//! `&'static Log`:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```rust</span>
<span class="doccomment">//! # extern crate log;</span>
<span class="doccomment">//! # use log::{Level, LevelFilter, Log, SetLoggerError, Metadata};</span>
<span class="doccomment">//! # struct SimpleLogger;</span>
<span class="doccomment">//! # impl log::Log for SimpleLogger {</span>
<span class="doccomment">//! # fn enabled(&self, _: &Metadata) -> bool { false }</span>
<span class="doccomment">//! # fn log(&self, _: &log::Record) {}</span>
<span class="doccomment">//! # fn flush(&self) {}</span>
<span class="doccomment">//! # }</span>
<span class="doccomment">//! # fn main() {}</span>
<span class="doccomment">//! # #[cfg(feature = "std")]</span>
<span class="doccomment">//! pub fn init() -> Result<(), SetLoggerError> {</span>
<span class="doccomment">//! log::set_boxed_logger(Box::new(SimpleLogger))</span>
<span class="doccomment">//! .map(|()| log::set_max_level(LevelFilter::Info))</span>
<span class="doccomment">//! }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Compile time filters</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! Log levels can be statically disabled at compile time via Cargo features. Log invocations at</span>
<span class="doccomment">//! disabled levels will be skipped and will not even be present in the resulting binary unless the</span>
<span class="doccomment">//! log level is specified dynamically. This level is configured separately for release and debug</span>
<span class="doccomment">//! builds. The features are:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * `max_level_off`</span>
<span class="doccomment">//! * `max_level_error`</span>
<span class="doccomment">//! * `max_level_warn`</span>
<span class="doccomment">//! * `max_level_info`</span>
<span class="doccomment">//! * `max_level_debug`</span>
<span class="doccomment">//! * `max_level_trace`</span>
<span class="doccomment">//! * `release_max_level_off`</span>
<span class="doccomment">//! * `release_max_level_error`</span>
<span class="doccomment">//! * `release_max_level_warn`</span>
<span class="doccomment">//! * `release_max_level_info`</span>
<span class="doccomment">//! * `release_max_level_debug`</span>
<span class="doccomment">//! * `release_max_level_trace`</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! These features control the value of the `STATIC_MAX_LEVEL` constant. The logging macros check</span>
<span class="doccomment">//! this value before logging a message. By default, no levels are disabled.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! For example, a crate can disable trace level logs in debug builds and trace, debug, and info</span>
<span class="doccomment">//! level logs in release builds with the following configuration:</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```toml</span>
<span class="doccomment">//! [dependencies]</span>
<span class="doccomment">//! log = { version = "0.4", features = ["max_level_debug", "release_max_level_warn"] }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//! # Crate Feature Flags</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The following crate feature flags are avaliable in addition to the filters. They are</span>
<span class="doccomment">//! configured in your `Cargo.toml`.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! * `std` allows use of `std` crate instead of the default `core`. Enables using `std::error` and</span>
<span class="doccomment">//! `set_boxed_logger` functionality.</span>
<span class="doccomment">//! * `serde` enables support for serialization and deserialization of `Level` and `LevelFilter`.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! ```toml</span>
<span class="doccomment">//! [dependencies]</span>
<span class="doccomment">//! log = { version = "0.4", features = ["std", "serde"] }</span>
<span class="doccomment">//! ```</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! # Version compatibility</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! The 0.3 and 0.4 versions of the `log` crate are almost entirely compatible. Log messages</span>
<span class="doccomment">//! made using `log` 0.3 will forward transparently to a logger implementation using `log` 0.4. Log</span>
<span class="doccomment">//! messages made using `log` 0.4 will forward to a logger implementation using `log` 0.3, but the</span>
<span class="doccomment">//! module path and file name information associated with the message will unfortunately be lost.</span>
<span class="doccomment">//!</span>
<span class="doccomment">//! [`Log`]: trait.Log.html</span>
<span class="doccomment">//! [level_link]: enum.Level.html</span>
<span class="doccomment">//! [filter_link]: enum.LevelFilter.html</span>
<span class="doccomment">//! [`set_logger`]: fn.set_logger.html</span>
<span class="doccomment">//! [`set_max_level`]: fn.set_max_level.html</span>
<span class="doccomment">//! [`try_set_logger_raw`]: fn.try_set_logger_raw.html</span>
<span class="doccomment">//! [`shutdown_logger_raw`]: fn.shutdown_logger_raw.html</span>
<span class="doccomment">//! [env_logger]: https://docs.rs/env_logger/*/env_logger/</span>
<span class="doccomment">//! [simple_logger]: https://github.com/borntyping/rust-simple_logger</span>
<span class="doccomment">//! [simplelog]: https://github.com/drakulix/simplelog.rs</span>
<span class="doccomment">//! [pretty_env_logger]: https://docs.rs/pretty_env_logger/*/pretty_env_logger/</span>
<span class="doccomment">//! [stderrlog]: https://docs.rs/stderrlog/*/stderrlog/</span>
<span class="doccomment">//! [flexi_logger]: https://docs.rs/flexi_logger/*/flexi_logger/</span>
<span class="doccomment">//! [syslog]: https://docs.rs/syslog/*/syslog/</span>
<span class="doccomment">//! [slog-stdlog]: https://docs.rs/slog-stdlog/*/slog_stdlog/</span>
<span class="doccomment">//! [log4rs]: https://docs.rs/log4rs/*/log4rs/</span>
<span class="doccomment">//! [fern]: https://docs.rs/fern/*/fern/</span>
<span class="attribute">#![<span class="ident">doc</span>(
<span class="ident">html_logo_url</span> <span class="op">=</span> <span class="string">"https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png"</span>,
<span class="ident">html_favicon_url</span> <span class="op">=</span> <span class="string">"https://www.rust-lang.org/favicon.ico"</span>,
<span class="ident">html_root_url</span> <span class="op">=</span> <span class="string">"https://docs.rs/log/0.4.6"</span>
)]</span>
<span class="attribute">#![<span class="ident">warn</span>(<span class="ident">missing_docs</span>)]</span>
<span class="attribute">#![<span class="ident">deny</span>(<span class="ident">missing_debug_implementations</span>)]</span>
<span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>), <span class="ident">no_std</span>)]</span>
<span class="comment">// When compiled for the rustc compiler itself we want to make sure that this is</span>
<span class="comment">// an unstable crate</span>
<span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">rustbuild</span>, <span class="ident">feature</span>(<span class="ident">staged_api</span>, <span class="ident">rustc_private</span>))]</span>
<span class="attribute">#![<span class="ident">cfg_attr</span>(<span class="ident">rustbuild</span>, <span class="ident">unstable</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"rustc_private"</span>, <span class="ident">issue</span> <span class="op">=</span> <span class="string">"27812"</span>))]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">not</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>))]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">core</span> <span class="kw">as</span> <span class="ident">std</span>;
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">cfg_if</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">cmp</span>;
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>)]</span>
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">error</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">fmt</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">mem</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">str</span>::<span class="ident">FromStr</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">sync</span>::<span class="ident">atomic</span>::{<span class="ident">AtomicUsize</span>, <span class="ident">Ordering</span>, <span class="ident">ATOMIC_USIZE_INIT</span>};
<span class="attribute">#[<span class="ident">macro_use</span>]</span>
<span class="kw">mod</span> <span class="ident">macros</span>;
<span class="kw">mod</span> <span class="ident">serde</span>;
<span class="comment">// The LOGGER static holds a pointer to the global logger. It is protected by</span>
<span class="comment">// the STATE static which determines whether LOGGER has been initialized yet.</span>
<span class="kw">static</span> <span class="kw-2">mut</span> <span class="ident">LOGGER</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">Log</span> <span class="op">=</span> <span class="kw-2">&</span><span class="ident">NopLogger</span>;
<span class="kw">static</span> <span class="ident">STATE</span>: <span class="ident">AtomicUsize</span> <span class="op">=</span> <span class="ident">ATOMIC_USIZE_INIT</span>;
<span class="comment">// There are three different states that we care about: the logger's</span>
<span class="comment">// uninitialized, the logger's initializing (set_logger's been called but</span>
<span class="comment">// LOGGER hasn't actually been set yet), or the logger's active.</span>
<span class="kw">const</span> <span class="ident">UNINITIALIZED</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">0</span>;
<span class="kw">const</span> <span class="ident">INITIALIZING</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">1</span>;
<span class="kw">const</span> <span class="ident">INITIALIZED</span>: <span class="ident">usize</span> <span class="op">=</span> <span class="number">2</span>;
<span class="kw">static</span> <span class="ident">MAX_LOG_LEVEL_FILTER</span>: <span class="ident">AtomicUsize</span> <span class="op">=</span> <span class="ident">ATOMIC_USIZE_INIT</span>;
<span class="kw">static</span> <span class="ident">LOG_LEVEL_NAMES</span>: [<span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span>; <span class="number">6</span>] <span class="op">=</span> [<span class="string">"OFF"</span>, <span class="string">"ERROR"</span>, <span class="string">"WARN"</span>, <span class="string">"INFO"</span>, <span class="string">"DEBUG"</span>, <span class="string">"TRACE"</span>];
<span class="kw">static</span> <span class="ident">SET_LOGGER_ERROR</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span> <span class="op">=</span> <span class="string">"attempted to set a logger after the logging system \
was already initialized"</span>;
<span class="kw">static</span> <span class="ident">LEVEL_PARSE_ERROR</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">str</span> <span class="op">=</span>
<span class="string">"attempted to convert a string that doesn't match an existing log level"</span>;
<span class="doccomment">/// An enum representing the available verbosity levels of the logger.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Typical usage includes: checking if a certain `Level` is enabled with</span>
<span class="doccomment">/// [`log_enabled!`](macro.log_enabled.html), specifying the `Level` of</span>
<span class="doccomment">/// [`log!`](macro.log.html), and comparing a `Level` directly to a</span>
<span class="doccomment">/// [`LevelFilter`](enum.LevelFilter.html).</span>
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">usize</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Eq</span>, <span class="ident">Debug</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">Level</span> {
<span class="doccomment">/// The "error" level.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Designates very serious errors.</span>
<span class="ident">Error</span> <span class="op">=</span> <span class="number">1</span>, <span class="comment">// This way these line up with the discriminants for LevelFilter below</span>
<span class="doccomment">/// The "warn" level.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Designates hazardous situations.</span>
<span class="ident">Warn</span>,
<span class="doccomment">/// The "info" level.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Designates useful information.</span>
<span class="ident">Info</span>,
<span class="doccomment">/// The "debug" level.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Designates lower priority information.</span>
<span class="ident">Debug</span>,
<span class="doccomment">/// The "trace" level.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Designates very low priority, often extremely verbose, information.</span>
<span class="ident">Trace</span>,
}
<span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">Level</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Level</span> {
<span class="kw-2">*</span><span class="self">self</span>
}
}
<span class="kw">impl</span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">Level</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Level</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">==</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
}
<span class="kw">impl</span> <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">LevelFilter</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Level</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">LevelFilter</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">==</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
}
<span class="kw">impl</span> <span class="ident">PartialOrd</span> <span class="kw">for</span> <span class="ident">Level</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Level</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">cmp</span>::<span class="ident">Ordering</span><span class="op">></span> {
<span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">cmp</span>(<span class="ident">other</span>))
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">lt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Level</span>) <span class="op">-></span> <span class="ident">bool</span> {
(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op"><</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">le</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Level</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op"><=</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">gt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Level</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">></span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">ge</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Level</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">>=</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
}
<span class="kw">impl</span> <span class="ident">PartialOrd</span><span class="op"><</span><span class="ident">LevelFilter</span><span class="op">></span> <span class="kw">for</span> <span class="ident">Level</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">LevelFilter</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">cmp</span>::<span class="ident">Ordering</span><span class="op">></span> {
<span class="prelude-val">Some</span>((<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">cmp</span>(<span class="kw-2">&</span>(<span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>)))
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">lt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">LevelFilter</span>) <span class="op">-></span> <span class="ident">bool</span> {
(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op"><</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">le</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">LevelFilter</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op"><=</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">gt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">LevelFilter</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">></span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">ge</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">LevelFilter</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">>=</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
}
<span class="kw">impl</span> <span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">Level</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Level</span>) <span class="op">-></span> <span class="ident">cmp</span>::<span class="ident">Ordering</span> {
(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">cmp</span>(<span class="kw-2">&</span>(<span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>))
}
}
<span class="kw">fn</span> <span class="ident">ok_or</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">></span>(<span class="ident">t</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">T</span><span class="op">></span>, <span class="ident">e</span>: <span class="ident">E</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">T</span>, <span class="ident">E</span><span class="op">></span> {
<span class="kw">match</span> <span class="ident">t</span> {
<span class="prelude-val">Some</span>(<span class="ident">t</span>) <span class="op">=></span> <span class="prelude-val">Ok</span>(<span class="ident">t</span>),
<span class="prelude-val">None</span> <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">e</span>),
}
}
<span class="comment">// Reimplemented here because std::ascii is not available in libcore</span>
<span class="kw">fn</span> <span class="ident">eq_ignore_ascii_case</span>(<span class="ident">a</span>: <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">b</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw">fn</span> <span class="ident">to_ascii_uppercase</span>(<span class="ident">c</span>: <span class="ident">u8</span>) <span class="op">-></span> <span class="ident">u8</span> {
<span class="kw">if</span> <span class="ident">c</span> <span class="op">>=</span> <span class="string">b'a'</span> <span class="op">&&</span> <span class="ident">c</span> <span class="op"><=</span> <span class="string">b'z'</span> {
<span class="ident">c</span> <span class="op">-</span> <span class="string">b'a'</span> <span class="op">+</span> <span class="string">b'A'</span>
} <span class="kw">else</span> {
<span class="ident">c</span>
}
}
<span class="kw">if</span> <span class="ident">a</span>.<span class="ident">len</span>() <span class="op">==</span> <span class="ident">b</span>.<span class="ident">len</span>() {
<span class="ident">a</span>.<span class="ident">bytes</span>()
.<span class="ident">zip</span>(<span class="ident">b</span>.<span class="ident">bytes</span>())
.<span class="ident">all</span>(<span class="op">|</span>(<span class="ident">a</span>, <span class="ident">b</span>)<span class="op">|</span> <span class="ident">to_ascii_uppercase</span>(<span class="ident">a</span>) <span class="op">==</span> <span class="ident">to_ascii_uppercase</span>(<span class="ident">b</span>))
} <span class="kw">else</span> {
<span class="bool-val">false</span>
}
}
<span class="kw">impl</span> <span class="ident">FromStr</span> <span class="kw">for</span> <span class="ident">Level</span> {
<span class="kw">type</span> <span class="prelude-val">Err</span> <span class="op">=</span> <span class="ident">ParseLevelError</span>;
<span class="kw">fn</span> <span class="ident">from_str</span>(<span class="ident">level</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">Level</span>, <span class="self">Self</span>::<span class="prelude-val">Err</span><span class="op">></span> {
<span class="ident">ok_or</span>(
<span class="ident">LOG_LEVEL_NAMES</span>
.<span class="ident">iter</span>()
.<span class="ident">position</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">name</span><span class="op">|</span> <span class="ident">eq_ignore_ascii_case</span>(<span class="ident">name</span>, <span class="ident">level</span>))
.<span class="ident">into_iter</span>()
.<span class="ident">filter</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">idx</span><span class="op">|</span> <span class="ident">idx</span> <span class="op">!=</span> <span class="number">0</span>)
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">idx</span><span class="op">|</span> <span class="ident">Level</span>::<span class="ident">from_usize</span>(<span class="ident">idx</span>).<span class="ident">unwrap</span>())
.<span class="ident">next</span>(),
<span class="ident">ParseLevelError</span>(()),
)
}
}
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">Level</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">fmt</span>.<span class="ident">pad</span>(<span class="ident">LOG_LEVEL_NAMES</span>[<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>])
}
}
<span class="kw">impl</span> <span class="ident">Level</span> {
<span class="kw">fn</span> <span class="ident">from_usize</span>(<span class="ident">u</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Level</span><span class="op">></span> {
<span class="kw">match</span> <span class="ident">u</span> {
<span class="number">1</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">Level</span>::<span class="ident">Error</span>),
<span class="number">2</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">Level</span>::<span class="ident">Warn</span>),
<span class="number">3</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">Level</span>::<span class="ident">Info</span>),
<span class="number">4</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">Level</span>::<span class="ident">Debug</span>),
<span class="number">5</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">Level</span>::<span class="ident">Trace</span>),
<span class="kw">_</span> <span class="op">=></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Returns the most verbose logging level.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">max</span>() <span class="op">-></span> <span class="ident">Level</span> {
<span class="ident">Level</span>::<span class="ident">Trace</span>
}
<span class="doccomment">/// Converts the `Level` to the equivalent `LevelFilter`.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_level_filter</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">LevelFilter</span> {
<span class="ident">LevelFilter</span>::<span class="ident">from_usize</span>(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">unwrap</span>()
}
}
<span class="doccomment">/// An enum representing the available verbosity level filters of the logger.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// A `LevelFilter` may be compared directly to a [`Level`]. Use this type</span>
<span class="doccomment">/// to get and set the maximum log level with [`max_level()`] and [`set_max_level`].</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`Level`]: enum.Level.html</span>
<span class="doccomment">/// [`max_level()`]: fn.max_level.html</span>
<span class="doccomment">/// [`set_max_level`]: fn.set_max_level.html</span>
<span class="attribute">#[<span class="ident">repr</span>(<span class="ident">usize</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Copy</span>, <span class="ident">Eq</span>, <span class="ident">Debug</span>, <span class="ident">Hash</span>)]</span>
<span class="kw">pub</span> <span class="kw">enum</span> <span class="ident">LevelFilter</span> {
<span class="doccomment">/// A level lower than all log levels.</span>
<span class="ident">Off</span>,
<span class="doccomment">/// Corresponds to the `Error` log level.</span>
<span class="ident">Error</span>,
<span class="doccomment">/// Corresponds to the `Warn` log level.</span>
<span class="ident">Warn</span>,
<span class="doccomment">/// Corresponds to the `Info` log level.</span>
<span class="ident">Info</span>,
<span class="doccomment">/// Corresponds to the `Debug` log level.</span>
<span class="ident">Debug</span>,
<span class="doccomment">/// Corresponds to the `Trace` log level.</span>
<span class="ident">Trace</span>,
}
<span class="comment">// Deriving generates terrible impls of these traits</span>
<span class="kw">impl</span> <span class="ident">Clone</span> <span class="kw">for</span> <span class="ident">LevelFilter</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">clone</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">LevelFilter</span> {
<span class="kw-2">*</span><span class="self">self</span>
}
}
<span class="kw">impl</span> <span class="ident">PartialEq</span> <span class="kw">for</span> <span class="ident">LevelFilter</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">LevelFilter</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">==</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
}
<span class="kw">impl</span> <span class="ident">PartialEq</span><span class="op"><</span><span class="ident">Level</span><span class="op">></span> <span class="kw">for</span> <span class="ident">LevelFilter</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">eq</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Level</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="ident">other</span>.<span class="ident">eq</span>(<span class="self">self</span>)
}
}
<span class="kw">impl</span> <span class="ident">PartialOrd</span> <span class="kw">for</span> <span class="ident">LevelFilter</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">LevelFilter</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">cmp</span>::<span class="ident">Ordering</span><span class="op">></span> {
<span class="prelude-val">Some</span>(<span class="self">self</span>.<span class="ident">cmp</span>(<span class="ident">other</span>))
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">lt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">LevelFilter</span>) <span class="op">-></span> <span class="ident">bool</span> {
(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op"><</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">le</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">LevelFilter</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op"><=</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">gt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">LevelFilter</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">></span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">ge</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">LevelFilter</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">>=</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
}
<span class="kw">impl</span> <span class="ident">PartialOrd</span><span class="op"><</span><span class="ident">Level</span><span class="op">></span> <span class="kw">for</span> <span class="ident">LevelFilter</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">partial_cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Level</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">cmp</span>::<span class="ident">Ordering</span><span class="op">></span> {
<span class="prelude-val">Some</span>((<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">cmp</span>(<span class="kw-2">&</span>(<span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>)))
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">lt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Level</span>) <span class="op">-></span> <span class="ident">bool</span> {
(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>) <span class="op"><</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">le</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Level</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op"><=</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">gt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Level</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">></span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">ge</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">Level</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span> <span class="op">>=</span> <span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>
}
}
<span class="kw">impl</span> <span class="ident">Ord</span> <span class="kw">for</span> <span class="ident">LevelFilter</span> {
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">fn</span> <span class="ident">cmp</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">other</span>: <span class="kw-2">&</span><span class="ident">LevelFilter</span>) <span class="op">-></span> <span class="ident">cmp</span>::<span class="ident">Ordering</span> {
(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>).<span class="ident">cmp</span>(<span class="kw-2">&</span>(<span class="kw-2">*</span><span class="ident">other</span> <span class="kw">as</span> <span class="ident">usize</span>))
}
}
<span class="kw">impl</span> <span class="ident">FromStr</span> <span class="kw">for</span> <span class="ident">LevelFilter</span> {
<span class="kw">type</span> <span class="prelude-val">Err</span> <span class="op">=</span> <span class="ident">ParseLevelError</span>;
<span class="kw">fn</span> <span class="ident">from_str</span>(<span class="ident">level</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span><span class="ident">LevelFilter</span>, <span class="self">Self</span>::<span class="prelude-val">Err</span><span class="op">></span> {
<span class="ident">ok_or</span>(
<span class="ident">LOG_LEVEL_NAMES</span>
.<span class="ident">iter</span>()
.<span class="ident">position</span>(<span class="op">|</span><span class="kw-2">&</span><span class="ident">name</span><span class="op">|</span> <span class="ident">eq_ignore_ascii_case</span>(<span class="ident">name</span>, <span class="ident">level</span>))
.<span class="ident">map</span>(<span class="op">|</span><span class="ident">p</span><span class="op">|</span> <span class="ident">LevelFilter</span>::<span class="ident">from_usize</span>(<span class="ident">p</span>).<span class="ident">unwrap</span>()),
<span class="ident">ParseLevelError</span>(()),
)
}
}
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">LevelFilter</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="macro">write</span><span class="macro">!</span>(<span class="ident">fmt</span>, <span class="string">"{}"</span>, <span class="ident">LOG_LEVEL_NAMES</span>[<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>])
}
}
<span class="kw">impl</span> <span class="ident">LevelFilter</span> {
<span class="kw">fn</span> <span class="ident">from_usize</span>(<span class="ident">u</span>: <span class="ident">usize</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">LevelFilter</span><span class="op">></span> {
<span class="kw">match</span> <span class="ident">u</span> {
<span class="number">0</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">LevelFilter</span>::<span class="ident">Off</span>),
<span class="number">1</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">LevelFilter</span>::<span class="ident">Error</span>),
<span class="number">2</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">LevelFilter</span>::<span class="ident">Warn</span>),
<span class="number">3</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">LevelFilter</span>::<span class="ident">Info</span>),
<span class="number">4</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">LevelFilter</span>::<span class="ident">Debug</span>),
<span class="number">5</span> <span class="op">=></span> <span class="prelude-val">Some</span>(<span class="ident">LevelFilter</span>::<span class="ident">Trace</span>),
<span class="kw">_</span> <span class="op">=></span> <span class="prelude-val">None</span>,
}
}
<span class="doccomment">/// Returns the most verbose logging level filter.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">max</span>() <span class="op">-></span> <span class="ident">LevelFilter</span> {
<span class="ident">LevelFilter</span>::<span class="ident">Trace</span>
}
<span class="doccomment">/// Converts `self` to the equivalent `Level`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Returns `None` if `self` is `LevelFilter::Off`.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">to_level</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">Level</span><span class="op">></span> {
<span class="ident">Level</span>::<span class="ident">from_usize</span>(<span class="kw-2">*</span><span class="self">self</span> <span class="kw">as</span> <span class="ident">usize</span>)
}
}
<span class="doccomment">/// The "payload" of a log message.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Use</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `Record` structures are passed as parameters to the [`log`][method.log]</span>
<span class="doccomment">/// method of the [`Log`] trait. Logger implementors manipulate these</span>
<span class="doccomment">/// structures in order to display log messages. `Record`s are automatically</span>
<span class="doccomment">/// created by the [`log!`] macro and so are not seen by log users.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that the [`level()`] and [`target()`] accessors are equivalent to</span>
<span class="doccomment">/// `self.metadata().level()` and `self.metadata().target()` respectively.</span>
<span class="doccomment">/// These methods are provided as a convenience for users of this structure.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The following example shows a simple logger that displays the level,</span>
<span class="doccomment">/// module path, and message of any `Record` that is passed to it.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// # extern crate log;</span>
<span class="doccomment">/// struct SimpleLogger;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl log::Log for SimpleLogger {</span>
<span class="doccomment">/// fn enabled(&self, metadata: &log::Metadata) -> bool {</span>
<span class="doccomment">/// true</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn log(&self, record: &log::Record) {</span>
<span class="doccomment">/// if !self.enabled(record.metadata()) {</span>
<span class="doccomment">/// return;</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// println!("{}:{} -- {}",</span>
<span class="doccomment">/// record.level(),</span>
<span class="doccomment">/// record.target(),</span>
<span class="doccomment">/// record.args());</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// fn flush(&self) {}</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [method.log]: trait.Log.html#tymethod.log</span>
<span class="doccomment">/// [`Log`]: trait.Log.html</span>
<span class="doccomment">/// [`log!`]: macro.log.html</span>
<span class="doccomment">/// [`level()`]: struct.Record.html#method.level</span>
<span class="doccomment">/// [`target()`]: struct.Record.html#method.target</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Record</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">metadata</span>: <span class="ident">Metadata</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>,
<span class="ident">args</span>: <span class="ident">fmt</span>::<span class="ident">Arguments</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>,
<span class="ident">module_path</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span><span class="op">></span>,
<span class="ident">file</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span><span class="op">></span>,
<span class="ident">line</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Record</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="doccomment">/// Returns a new builder.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">builder</span>() <span class="op">-></span> <span class="ident">RecordBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">RecordBuilder</span>::<span class="ident">new</span>()
}
<span class="doccomment">/// The message body.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">args</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">fmt</span>::<span class="ident">Arguments</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">args</span>
}
<span class="doccomment">/// Metadata about the log directive.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">metadata</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">Metadata</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="kw-2">&</span><span class="self">self</span>.<span class="ident">metadata</span>
}
<span class="doccomment">/// The verbosity level of the message.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">level</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Level</span> {
<span class="self">self</span>.<span class="ident">metadata</span>.<span class="ident">level</span>()
}
<span class="doccomment">/// The name of the target of the directive.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">target</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span> {
<span class="self">self</span>.<span class="ident">metadata</span>.<span class="ident">target</span>()
}
<span class="doccomment">/// The module path of the message.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">module_path</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">module_path</span>
}
<span class="doccomment">/// The source file containing the message.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">file</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">file</span>
}
<span class="doccomment">/// The line containing the message.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">line</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">line</span>
}
}
<span class="doccomment">/// Builder for [`Record`](struct.Record.html).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Typically should only be used by log library creators or for testing and "shim loggers".</span>
<span class="doccomment">/// The `RecordBuilder` can set the different parameters of `Record` object, and returns</span>
<span class="doccomment">/// the created object when `build` is called.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use log::{Level, Record};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let record = Record::builder()</span>
<span class="doccomment">/// .args(format_args!("Error!"))</span>
<span class="doccomment">/// .level(Level::Error)</span>
<span class="doccomment">/// .target("myApp")</span>
<span class="doccomment">/// .file(Some("server.rs"))</span>
<span class="doccomment">/// .line(Some(144))</span>
<span class="doccomment">/// .module_path(Some("server"))</span>
<span class="doccomment">/// .build();</span>
<span class="doccomment">/// ```</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Alternatively, use [`MetadataBuilder`](struct.MetadataBuilder.html):</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// use log::{Record, Level, MetadataBuilder};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let error_metadata = MetadataBuilder::new()</span>
<span class="doccomment">/// .target("myApp")</span>
<span class="doccomment">/// .level(Level::Error)</span>
<span class="doccomment">/// .build();</span>
<span class="doccomment">///</span>
<span class="doccomment">/// let record = Record::builder()</span>
<span class="doccomment">/// .metadata(error_metadata)</span>
<span class="doccomment">/// .args(format_args!("Error!"))</span>
<span class="doccomment">/// .line(Some(433))</span>
<span class="doccomment">/// .file(Some("app.rs"))</span>
<span class="doccomment">/// .module_path(Some("server"))</span>
<span class="doccomment">/// .build();</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">RecordBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">record</span>: <span class="ident">Record</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">RecordBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="doccomment">/// Construct new `RecordBuilder`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The default options are:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - `args`: [`format_args!("")`]</span>
<span class="doccomment">/// - `metadata`: [`Metadata::builder().build()`]</span>
<span class="doccomment">/// - `module_path`: `None`</span>
<span class="doccomment">/// - `file`: `None`</span>
<span class="doccomment">/// - `line`: `None`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`format_args!("")`]: https://doc.rust-lang.org/std/macro.format_args.html</span>
<span class="doccomment">/// [`Metadata::builder().build()`]: struct.MetadataBuilder.html#method.build</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-></span> <span class="ident">RecordBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">RecordBuilder</span> {
<span class="ident">record</span>: <span class="ident">Record</span> {
<span class="ident">args</span>: <span class="macro">format_args</span><span class="macro">!</span>(<span class="string">""</span>),
<span class="ident">metadata</span>: <span class="ident">Metadata</span>::<span class="ident">builder</span>().<span class="ident">build</span>(),
<span class="ident">module_path</span>: <span class="prelude-val">None</span>,
<span class="ident">file</span>: <span class="prelude-val">None</span>,
<span class="ident">line</span>: <span class="prelude-val">None</span>,
},
}
}
<span class="doccomment">/// Set [`args`](struct.Record.html#method.args).</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">args</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">args</span>: <span class="ident">fmt</span>::<span class="ident">Arguments</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">RecordBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">record</span>.<span class="ident">args</span> <span class="op">=</span> <span class="ident">args</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set [`metadata`](struct.Record.html#method.metadata). Construct a `Metadata` object with [`MetadataBuilder`](struct.MetadataBuilder.html).</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">metadata</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">metadata</span>: <span class="ident">Metadata</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">RecordBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">record</span>.<span class="ident">metadata</span> <span class="op">=</span> <span class="ident">metadata</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set [`Metadata::level`](struct.Metadata.html#method.level).</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">level</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">level</span>: <span class="ident">Level</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">RecordBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">record</span>.<span class="ident">metadata</span>.<span class="ident">level</span> <span class="op">=</span> <span class="ident">level</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set [`Metadata::target`](struct.Metadata.html#method.target)</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">target</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">target</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">RecordBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">record</span>.<span class="ident">metadata</span>.<span class="ident">target</span> <span class="op">=</span> <span class="ident">target</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set [`module_path`](struct.Record.html#method.module_path)</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">module_path</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">path</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span><span class="op">></span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">RecordBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">record</span>.<span class="ident">module_path</span> <span class="op">=</span> <span class="ident">path</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set [`file`](struct.Record.html#method.file)</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">file</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">file</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span><span class="op">></span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">RecordBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">record</span>.<span class="ident">file</span> <span class="op">=</span> <span class="ident">file</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Set [`line`](struct.Record.html#method.line)</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">line</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">line</span>: <span class="prelude-ty">Option</span><span class="op"><</span><span class="ident">u32</span><span class="op">></span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">RecordBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">record</span>.<span class="ident">line</span> <span class="op">=</span> <span class="ident">line</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Invoke the builder and return a `Record`</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">build</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Record</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">record</span>.<span class="ident">clone</span>()
}
}
<span class="doccomment">/// Metadata about a log message.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Use</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `Metadata` structs are created when users of the library use</span>
<span class="doccomment">/// logging macros.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// They are consumed by implementations of the `Log` trait in the</span>
<span class="doccomment">/// `enabled` method.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// `Record`s use `Metadata` to determine the log message's severity</span>
<span class="doccomment">/// and target.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Users should use the `log_enabled!` macro in their code to avoid</span>
<span class="doccomment">/// constructing expensive log messages.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// # #[macro_use]</span>
<span class="doccomment">/// # extern crate log;</span>
<span class="doccomment">/// #</span>
<span class="doccomment">/// use log::{Record, Level, Metadata};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct MyLogger;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl log::Log for MyLogger {</span>
<span class="doccomment">/// fn enabled(&self, metadata: &Metadata) -> bool {</span>
<span class="doccomment">/// metadata.level() <= Level::Info</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn log(&self, record: &Record) {</span>
<span class="doccomment">/// if self.enabled(record.metadata()) {</span>
<span class="doccomment">/// println!("{} - {}", record.level(), record.args());</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// fn flush(&self) {}</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn main(){}</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Clone</span>, <span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Ord</span>, <span class="ident">PartialOrd</span>, <span class="ident">Hash</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">Metadata</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">level</span>: <span class="ident">Level</span>,
<span class="ident">target</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">Metadata</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="doccomment">/// Returns a new builder.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">builder</span>() <span class="op">-></span> <span class="ident">MetadataBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">MetadataBuilder</span>::<span class="ident">new</span>()
}
<span class="doccomment">/// The verbosity level of the message.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">level</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Level</span> {
<span class="self">self</span>.<span class="ident">level</span>
}
<span class="doccomment">/// The name of the target of the directive.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">target</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span> {
<span class="self">self</span>.<span class="ident">target</span>
}
}
<span class="doccomment">/// Builder for [`Metadata`](struct.Metadata.html).</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Typically should only be used by log library creators or for testing and "shim loggers".</span>
<span class="doccomment">/// The `MetadataBuilder` can set the different parameters of a `Metadata` object, and returns</span>
<span class="doccomment">/// the created object when `build` is called.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Example</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// let target = "myApp";</span>
<span class="doccomment">/// use log::{Level, MetadataBuilder};</span>
<span class="doccomment">/// let metadata = MetadataBuilder::new()</span>
<span class="doccomment">/// .level(Level::Debug)</span>
<span class="doccomment">/// .target(target)</span>
<span class="doccomment">/// .build();</span>
<span class="doccomment">/// ```</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Eq</span>, <span class="ident">PartialEq</span>, <span class="ident">Ord</span>, <span class="ident">PartialOrd</span>, <span class="ident">Hash</span>, <span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">MetadataBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">metadata</span>: <span class="ident">Metadata</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span>,
}
<span class="kw">impl</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> <span class="ident">MetadataBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="doccomment">/// Construct a new `MetadataBuilder`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The default options are:</span>
<span class="doccomment">///</span>
<span class="doccomment">/// - `level`: `Level::Info`</span>
<span class="doccomment">/// - `target`: `""`</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">new</span>() <span class="op">-></span> <span class="ident">MetadataBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="ident">MetadataBuilder</span> {
<span class="ident">metadata</span>: <span class="ident">Metadata</span> {
<span class="ident">level</span>: <span class="ident">Level</span>::<span class="ident">Info</span>,
<span class="ident">target</span>: <span class="string">""</span>,
},
}
}
<span class="doccomment">/// Setter for [`level`](struct.Metadata.html#method.level).</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">level</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">arg</span>: <span class="ident">Level</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">MetadataBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">metadata</span>.<span class="ident">level</span> <span class="op">=</span> <span class="ident">arg</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Setter for [`target`](struct.Metadata.html#method.target).</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">target</span>(<span class="kw-2">&</span><span class="kw-2">mut</span> <span class="self">self</span>, <span class="ident">target</span>: <span class="kw-2">&</span><span class="lifetime">'a</span> <span class="ident">str</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">MetadataBuilder</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">metadata</span>.<span class="ident">target</span> <span class="op">=</span> <span class="ident">target</span>;
<span class="self">self</span>
}
<span class="doccomment">/// Returns a `Metadata` object.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">build</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="ident">Metadata</span><span class="op"><</span><span class="lifetime">'a</span><span class="op">></span> {
<span class="self">self</span>.<span class="ident">metadata</span>.<span class="ident">clone</span>()
}
}
<span class="doccomment">/// A trait encapsulating the operations required of a logger.</span>
<span class="kw">pub</span> <span class="kw">trait</span> <span class="ident">Log</span>: <span class="ident">Sync</span> <span class="op">+</span> <span class="ident">Send</span> {
<span class="doccomment">/// Determines if a log message with the specified metadata would be</span>
<span class="doccomment">/// logged.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is used by the `log_enabled!` macro to allow callers to avoid</span>
<span class="doccomment">/// expensive computation of log message arguments if the message would be</span>
<span class="doccomment">/// discarded anyway.</span>
<span class="kw">fn</span> <span class="ident">enabled</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">metadata</span>: <span class="kw-2">&</span><span class="ident">Metadata</span>) <span class="op">-></span> <span class="ident">bool</span>;
<span class="doccomment">/// Logs the `Record`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Note that `enabled` is *not* necessarily called before this method.</span>
<span class="doccomment">/// Implementations of `log` should perform all necessary filtering</span>
<span class="doccomment">/// internally.</span>
<span class="kw">fn</span> <span class="ident">log</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">record</span>: <span class="kw-2">&</span><span class="ident">Record</span>);
<span class="doccomment">/// Flushes any buffered records.</span>
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="self">self</span>);
}
<span class="comment">// Just used as a dummy initial value for LOGGER</span>
<span class="kw">struct</span> <span class="ident">NopLogger</span>;
<span class="kw">impl</span> <span class="ident">Log</span> <span class="kw">for</span> <span class="ident">NopLogger</span> {
<span class="kw">fn</span> <span class="ident">enabled</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="ident">Metadata</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="bool-val">false</span>
}
<span class="kw">fn</span> <span class="ident">log</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="kw">_</span>: <span class="kw-2">&</span><span class="ident">Record</span>) {}
<span class="kw">fn</span> <span class="ident">flush</span>(<span class="kw-2">&</span><span class="self">self</span>) {}
}
<span class="doccomment">/// Sets the global maximum log level.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Generally, this should only be called by the active logging implementation.</span>
<span class="attribute">#[<span class="ident">inline</span>]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_max_level</span>(<span class="ident">level</span>: <span class="ident">LevelFilter</span>) {
<span class="ident">MAX_LOG_LEVEL_FILTER</span>.<span class="ident">store</span>(<span class="ident">level</span> <span class="kw">as</span> <span class="ident">usize</span>, <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>)
}
<span class="doccomment">/// Returns the current maximum log level.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// The [`log!`], [`error!`], [`warn!`], [`info!`], [`debug!`], and [`trace!`] macros check</span>
<span class="doccomment">/// this value and discard any message logged at a higher level. The maximum</span>
<span class="doccomment">/// log level is set by the [`set_max_level`] function.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`log!`]: macro.log.html</span>
<span class="doccomment">/// [`error!`]: macro.error.html</span>
<span class="doccomment">/// [`warn!`]: macro.warn.html</span>
<span class="doccomment">/// [`info!`]: macro.info.html</span>
<span class="doccomment">/// [`debug!`]: macro.debug.html</span>
<span class="doccomment">/// [`trace!`]: macro.trace.html</span>
<span class="doccomment">/// [`set_max_level`]: fn.set_max_level.html</span>
<span class="attribute">#[<span class="ident">inline</span>(<span class="ident">always</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">max_level</span>() <span class="op">-></span> <span class="ident">LevelFilter</span> {
<span class="kw">unsafe</span> { <span class="ident">mem</span>::<span class="ident">transmute</span>(<span class="ident">MAX_LOG_LEVEL_FILTER</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">Relaxed</span>)) }
}
<span class="doccomment">/// Sets the global logger to a `Box<Log>`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This is a simple convenience wrapper over `set_logger`, which takes a</span>
<span class="doccomment">/// `Box<Log>` rather than a `&'static Log`. See the documentation for</span>
<span class="doccomment">/// [`set_logger`] for more details.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// Requires the `std` feature.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// An error is returned if a logger has already been set.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`set_logger`]: fn.set_logger.html</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_boxed_logger</span>(<span class="ident">logger</span>: <span class="ident">Box</span><span class="op"><</span><span class="ident">Log</span><span class="op">></span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">SetLoggerError</span><span class="op">></span> {
<span class="ident">set_logger_inner</span>(<span class="op">||</span> <span class="kw">unsafe</span> { <span class="kw-2">&</span><span class="kw-2">*</span><span class="ident">Box</span>::<span class="ident">into_raw</span>(<span class="ident">logger</span>) })
}
<span class="doccomment">/// Sets the global logger to a `&'static Log`.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function may only be called once in the lifetime of a program. Any log</span>
<span class="doccomment">/// events that occur before the call to `set_logger` completes will be ignored.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This function does not typically need to be called manually. Logger</span>
<span class="doccomment">/// implementations should provide an initialization method that installs the</span>
<span class="doccomment">/// logger internally.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Errors</span>
<span class="doccomment">///</span>
<span class="doccomment">/// An error is returned if a logger has already been set.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # Examples</span>
<span class="doccomment">///</span>
<span class="doccomment">/// ```rust</span>
<span class="doccomment">/// # #[macro_use]</span>
<span class="doccomment">/// # extern crate log;</span>
<span class="doccomment">/// #</span>
<span class="doccomment">/// use log::{Record, Level, Metadata, LevelFilter};</span>
<span class="doccomment">///</span>
<span class="doccomment">/// static MY_LOGGER: MyLogger = MyLogger;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// struct MyLogger;</span>
<span class="doccomment">///</span>
<span class="doccomment">/// impl log::Log for MyLogger {</span>
<span class="doccomment">/// fn enabled(&self, metadata: &Metadata) -> bool {</span>
<span class="doccomment">/// metadata.level() <= Level::Info</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// fn log(&self, record: &Record) {</span>
<span class="doccomment">/// if self.enabled(record.metadata()) {</span>
<span class="doccomment">/// println!("{} - {}", record.level(), record.args());</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// }</span>
<span class="doccomment">/// fn flush(&self) {}</span>
<span class="doccomment">/// }</span>
<span class="doccomment">///</span>
<span class="doccomment">/// # fn main(){</span>
<span class="doccomment">/// log::set_logger(&MY_LOGGER).unwrap();</span>
<span class="doccomment">/// log::set_max_level(LevelFilter::Info);</span>
<span class="doccomment">///</span>
<span class="doccomment">/// info!("hello log");</span>
<span class="doccomment">/// warn!("warning");</span>
<span class="doccomment">/// error!("oops");</span>
<span class="doccomment">/// # }</span>
<span class="doccomment">/// ```</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">set_logger</span>(<span class="ident">logger</span>: <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">Log</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">SetLoggerError</span><span class="op">></span> {
<span class="ident">set_logger_inner</span>(<span class="op">||</span> <span class="ident">logger</span>)
}
<span class="kw">fn</span> <span class="ident">set_logger_inner</span><span class="op"><</span><span class="ident">F</span><span class="op">></span>(<span class="ident">make_logger</span>: <span class="ident">F</span>) <span class="op">-></span> <span class="prelude-ty">Result</span><span class="op"><</span>(), <span class="ident">SetLoggerError</span><span class="op">></span>
<span class="kw">where</span>
<span class="ident">F</span>: <span class="ident">FnOnce</span>() <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">Log</span>,
{
<span class="kw">unsafe</span> {
<span class="kw">match</span> <span class="ident">STATE</span>.<span class="ident">compare_and_swap</span>(<span class="ident">UNINITIALIZED</span>, <span class="ident">INITIALIZING</span>, <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>) {
<span class="ident">UNINITIALIZED</span> <span class="op">=></span> {
<span class="ident">LOGGER</span> <span class="op">=</span> <span class="ident">make_logger</span>();
<span class="ident">STATE</span>.<span class="ident">store</span>(<span class="ident">INITIALIZED</span>, <span class="ident">Ordering</span>::<span class="ident">SeqCst</span>);
<span class="prelude-val">Ok</span>(())
}
<span class="ident">INITIALIZING</span> <span class="op">=></span> {
<span class="kw">while</span> <span class="ident">STATE</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">SeqCst</span>) <span class="op">==</span> <span class="ident">INITIALIZING</span> {}
<span class="prelude-val">Err</span>(<span class="ident">SetLoggerError</span>(()))
}
<span class="kw">_</span> <span class="op">=></span> <span class="prelude-val">Err</span>(<span class="ident">SetLoggerError</span>(())),
}
}
}
<span class="doccomment">/// The type returned by [`set_logger`] if [`set_logger`] has already been called.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`set_logger`]: fn.set_logger.html</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_copy_implementations</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">SetLoggerError</span>(());
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">SetLoggerError</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">fmt</span>.<span class="ident">write_str</span>(<span class="ident">SET_LOGGER_ERROR</span>)
}
}
<span class="comment">// The Error trait is not available in libcore</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>)]</span>
<span class="kw">impl</span> <span class="ident">error</span>::<span class="ident">Error</span> <span class="kw">for</span> <span class="ident">SetLoggerError</span> {
<span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">str</span> {
<span class="ident">SET_LOGGER_ERROR</span>
}
}
<span class="doccomment">/// The type returned by [`from_str`] when the string doesn't match any of the log levels.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`from_str`]: https://doc.rust-lang.org/std/str/trait.FromStr.html#tymethod.from_str</span>
<span class="attribute">#[<span class="ident">allow</span>(<span class="ident">missing_copy_implementations</span>)]</span>
<span class="attribute">#[<span class="ident">derive</span>(<span class="ident">Debug</span>, <span class="ident">PartialEq</span>)]</span>
<span class="kw">pub</span> <span class="kw">struct</span> <span class="ident">ParseLevelError</span>(());
<span class="kw">impl</span> <span class="ident">fmt</span>::<span class="ident">Display</span> <span class="kw">for</span> <span class="ident">ParseLevelError</span> {
<span class="kw">fn</span> <span class="ident">fmt</span>(<span class="kw-2">&</span><span class="self">self</span>, <span class="ident">fmt</span>: <span class="kw-2">&</span><span class="kw-2">mut</span> <span class="ident">fmt</span>::<span class="ident">Formatter</span>) <span class="op">-></span> <span class="ident">fmt</span>::<span class="prelude-ty">Result</span> {
<span class="ident">fmt</span>.<span class="ident">write_str</span>(<span class="ident">LEVEL_PARSE_ERROR</span>)
}
}
<span class="comment">// The Error trait is not available in libcore</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>)]</span>
<span class="kw">impl</span> <span class="ident">error</span>::<span class="ident">Error</span> <span class="kw">for</span> <span class="ident">ParseLevelError</span> {
<span class="kw">fn</span> <span class="ident">description</span>(<span class="kw-2">&</span><span class="self">self</span>) <span class="op">-></span> <span class="kw-2">&</span><span class="ident">str</span> {
<span class="ident">LEVEL_PARSE_ERROR</span>
}
}
<span class="doccomment">/// Returns a reference to the logger.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// If a logger has not been set, a no-op implementation is returned.</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">logger</span>() <span class="op">-></span> <span class="kw-2">&</span><span class="lifetime">'static</span> <span class="ident">Log</span> {
<span class="kw">unsafe</span> {
<span class="kw">if</span> <span class="ident">STATE</span>.<span class="ident">load</span>(<span class="ident">Ordering</span>::<span class="ident">SeqCst</span>) <span class="op">!=</span> <span class="ident">INITIALIZED</span> {
<span class="kw">static</span> <span class="ident">NOP</span>: <span class="ident">NopLogger</span> <span class="op">=</span> <span class="ident">NopLogger</span>;
<span class="kw-2">&</span><span class="ident">NOP</span>
} <span class="kw">else</span> {
<span class="ident">LOGGER</span>
}
}
}
<span class="comment">// WARNING: this is not part of the crate's public API and is subject to change at any time</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">__private_api_log</span>(
<span class="ident">args</span>: <span class="ident">fmt</span>::<span class="ident">Arguments</span>,
<span class="ident">level</span>: <span class="ident">Level</span>,
<span class="kw-2">&</span>(<span class="ident">target</span>, <span class="ident">module_path</span>, <span class="ident">file</span>, <span class="ident">line</span>): <span class="kw-2">&</span>(<span class="kw-2">&</span><span class="ident">str</span>, <span class="kw-2">&</span><span class="ident">str</span>, <span class="kw-2">&</span><span class="ident">str</span>, <span class="ident">u32</span>),
) {
<span class="ident">logger</span>().<span class="ident">log</span>(
<span class="kw-2">&</span><span class="ident">Record</span>::<span class="ident">builder</span>()
.<span class="ident">args</span>(<span class="ident">args</span>)
.<span class="ident">level</span>(<span class="ident">level</span>)
.<span class="ident">target</span>(<span class="ident">target</span>)
.<span class="ident">module_path</span>(<span class="prelude-val">Some</span>(<span class="ident">module_path</span>))
.<span class="ident">file</span>(<span class="prelude-val">Some</span>(<span class="ident">file</span>))
.<span class="ident">line</span>(<span class="prelude-val">Some</span>(<span class="ident">line</span>))
.<span class="ident">build</span>(),
);
}
<span class="comment">// WARNING: this is not part of the crate's public API and is subject to change at any time</span>
<span class="attribute">#[<span class="ident">doc</span>(<span class="ident">hidden</span>)]</span>
<span class="kw">pub</span> <span class="kw">fn</span> <span class="ident">__private_api_enabled</span>(<span class="ident">level</span>: <span class="ident">Level</span>, <span class="ident">target</span>: <span class="kw-2">&</span><span class="ident">str</span>) <span class="op">-></span> <span class="ident">bool</span> {
<span class="ident">logger</span>().<span class="ident">enabled</span>(<span class="kw-2">&</span><span class="ident">Metadata</span>::<span class="ident">builder</span>().<span class="ident">level</span>(<span class="ident">level</span>).<span class="ident">target</span>(<span class="ident">target</span>).<span class="ident">build</span>())
}
<span class="doccomment">/// The statically resolved maximum log level.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// See the crate level documentation for information on how to configure this.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This value is checked by the log macros, but not by the `Log`ger returned by</span>
<span class="doccomment">/// the [`logger`] function. Code that manually calls functions on that value</span>
<span class="doccomment">/// should compare the level against this value.</span>
<span class="doccomment">///</span>
<span class="doccomment">/// [`logger`]: fn.logger.html</span>
<span class="kw">pub</span> <span class="kw">const</span> <span class="ident">STATIC_MAX_LEVEL</span>: <span class="ident">LevelFilter</span> <span class="op">=</span> <span class="ident">MAX_LEVEL_INNER</span>;
<span class="macro">cfg_if</span><span class="macro">!</span> {
<span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">debug_assertions</span>), <span class="ident">feature</span> <span class="op">=</span> <span class="string">"release_max_level_off"</span>))]</span> {
<span class="kw">const</span> <span class="ident">MAX_LEVEL_INNER</span>: <span class="ident">LevelFilter</span> <span class="op">=</span> <span class="ident">LevelFilter</span>::<span class="ident">Off</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">debug_assertions</span>), <span class="ident">feature</span> <span class="op">=</span> <span class="string">"release_max_level_error"</span>))]</span> {
<span class="kw">const</span> <span class="ident">MAX_LEVEL_INNER</span>: <span class="ident">LevelFilter</span> <span class="op">=</span> <span class="ident">LevelFilter</span>::<span class="ident">Error</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">debug_assertions</span>), <span class="ident">feature</span> <span class="op">=</span> <span class="string">"release_max_level_warn"</span>))]</span> {
<span class="kw">const</span> <span class="ident">MAX_LEVEL_INNER</span>: <span class="ident">LevelFilter</span> <span class="op">=</span> <span class="ident">LevelFilter</span>::<span class="ident">Warn</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">debug_assertions</span>), <span class="ident">feature</span> <span class="op">=</span> <span class="string">"release_max_level_info"</span>))]</span> {
<span class="kw">const</span> <span class="ident">MAX_LEVEL_INNER</span>: <span class="ident">LevelFilter</span> <span class="op">=</span> <span class="ident">LevelFilter</span>::<span class="ident">Info</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">debug_assertions</span>), <span class="ident">feature</span> <span class="op">=</span> <span class="string">"release_max_level_debug"</span>))]</span> {
<span class="kw">const</span> <span class="ident">MAX_LEVEL_INNER</span>: <span class="ident">LevelFilter</span> <span class="op">=</span> <span class="ident">LevelFilter</span>::<span class="ident">Debug</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">all</span>(<span class="ident">not</span>(<span class="ident">debug_assertions</span>), <span class="ident">feature</span> <span class="op">=</span> <span class="string">"release_max_level_trace"</span>))]</span> {
<span class="kw">const</span> <span class="ident">MAX_LEVEL_INNER</span>: <span class="ident">LevelFilter</span> <span class="op">=</span> <span class="ident">LevelFilter</span>::<span class="ident">Trace</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"max_level_off"</span>)]</span> {
<span class="kw">const</span> <span class="ident">MAX_LEVEL_INNER</span>: <span class="ident">LevelFilter</span> <span class="op">=</span> <span class="ident">LevelFilter</span>::<span class="ident">Off</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"max_level_error"</span>)]</span> {
<span class="kw">const</span> <span class="ident">MAX_LEVEL_INNER</span>: <span class="ident">LevelFilter</span> <span class="op">=</span> <span class="ident">LevelFilter</span>::<span class="ident">Error</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"max_level_warn"</span>)]</span> {
<span class="kw">const</span> <span class="ident">MAX_LEVEL_INNER</span>: <span class="ident">LevelFilter</span> <span class="op">=</span> <span class="ident">LevelFilter</span>::<span class="ident">Warn</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"max_level_info"</span>)]</span> {
<span class="kw">const</span> <span class="ident">MAX_LEVEL_INNER</span>: <span class="ident">LevelFilter</span> <span class="op">=</span> <span class="ident">LevelFilter</span>::<span class="ident">Info</span>;
} <span class="kw">else</span> <span class="kw">if</span> <span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"max_level_debug"</span>)]</span> {
<span class="kw">const</span> <span class="ident">MAX_LEVEL_INNER</span>: <span class="ident">LevelFilter</span> <span class="op">=</span> <span class="ident">LevelFilter</span>::<span class="ident">Debug</span>;
} <span class="kw">else</span> {
<span class="kw">const</span> <span class="ident">MAX_LEVEL_INNER</span>: <span class="ident">LevelFilter</span> <span class="op">=</span> <span class="ident">LevelFilter</span>::<span class="ident">Trace</span>;
}
}
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">test</span>)]</span>
<span class="kw">mod</span> <span class="ident">tests</span> {
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">std</span>;
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">Level</span>, <span class="ident">LevelFilter</span>, <span class="ident">ParseLevelError</span>};
<span class="kw">use</span> <span class="ident">tests</span>::<span class="ident">std</span>::<span class="ident">string</span>::<span class="ident">ToString</span>;
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_levelfilter_from_str</span>() {
<span class="kw">let</span> <span class="ident">tests</span> <span class="op">=</span> [
(<span class="string">"off"</span>, <span class="prelude-val">Ok</span>(<span class="ident">LevelFilter</span>::<span class="ident">Off</span>)),
(<span class="string">"error"</span>, <span class="prelude-val">Ok</span>(<span class="ident">LevelFilter</span>::<span class="ident">Error</span>)),
(<span class="string">"warn"</span>, <span class="prelude-val">Ok</span>(<span class="ident">LevelFilter</span>::<span class="ident">Warn</span>)),
(<span class="string">"info"</span>, <span class="prelude-val">Ok</span>(<span class="ident">LevelFilter</span>::<span class="ident">Info</span>)),
(<span class="string">"debug"</span>, <span class="prelude-val">Ok</span>(<span class="ident">LevelFilter</span>::<span class="ident">Debug</span>)),
(<span class="string">"trace"</span>, <span class="prelude-val">Ok</span>(<span class="ident">LevelFilter</span>::<span class="ident">Trace</span>)),
(<span class="string">"OFF"</span>, <span class="prelude-val">Ok</span>(<span class="ident">LevelFilter</span>::<span class="ident">Off</span>)),
(<span class="string">"ERROR"</span>, <span class="prelude-val">Ok</span>(<span class="ident">LevelFilter</span>::<span class="ident">Error</span>)),
(<span class="string">"WARN"</span>, <span class="prelude-val">Ok</span>(<span class="ident">LevelFilter</span>::<span class="ident">Warn</span>)),
(<span class="string">"INFO"</span>, <span class="prelude-val">Ok</span>(<span class="ident">LevelFilter</span>::<span class="ident">Info</span>)),
(<span class="string">"DEBUG"</span>, <span class="prelude-val">Ok</span>(<span class="ident">LevelFilter</span>::<span class="ident">Debug</span>)),
(<span class="string">"TRACE"</span>, <span class="prelude-val">Ok</span>(<span class="ident">LevelFilter</span>::<span class="ident">Trace</span>)),
(<span class="string">"asdf"</span>, <span class="prelude-val">Err</span>(<span class="ident">ParseLevelError</span>(()))),
];
<span class="kw">for</span> <span class="kw-2">&</span>(<span class="ident">s</span>, <span class="kw-2">ref</span> <span class="ident">expected</span>) <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">tests</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">expected</span>, <span class="kw-2">&</span><span class="ident">s</span>.<span class="ident">parse</span>());
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_level_from_str</span>() {
<span class="kw">let</span> <span class="ident">tests</span> <span class="op">=</span> [
(<span class="string">"OFF"</span>, <span class="prelude-val">Err</span>(<span class="ident">ParseLevelError</span>(()))),
(<span class="string">"error"</span>, <span class="prelude-val">Ok</span>(<span class="ident">Level</span>::<span class="ident">Error</span>)),
(<span class="string">"warn"</span>, <span class="prelude-val">Ok</span>(<span class="ident">Level</span>::<span class="ident">Warn</span>)),
(<span class="string">"info"</span>, <span class="prelude-val">Ok</span>(<span class="ident">Level</span>::<span class="ident">Info</span>)),
(<span class="string">"debug"</span>, <span class="prelude-val">Ok</span>(<span class="ident">Level</span>::<span class="ident">Debug</span>)),
(<span class="string">"trace"</span>, <span class="prelude-val">Ok</span>(<span class="ident">Level</span>::<span class="ident">Trace</span>)),
(<span class="string">"ERROR"</span>, <span class="prelude-val">Ok</span>(<span class="ident">Level</span>::<span class="ident">Error</span>)),
(<span class="string">"WARN"</span>, <span class="prelude-val">Ok</span>(<span class="ident">Level</span>::<span class="ident">Warn</span>)),
(<span class="string">"INFO"</span>, <span class="prelude-val">Ok</span>(<span class="ident">Level</span>::<span class="ident">Info</span>)),
(<span class="string">"DEBUG"</span>, <span class="prelude-val">Ok</span>(<span class="ident">Level</span>::<span class="ident">Debug</span>)),
(<span class="string">"TRACE"</span>, <span class="prelude-val">Ok</span>(<span class="ident">Level</span>::<span class="ident">Trace</span>)),
(<span class="string">"asdf"</span>, <span class="prelude-val">Err</span>(<span class="ident">ParseLevelError</span>(()))),
];
<span class="kw">for</span> <span class="kw-2">&</span>(<span class="ident">s</span>, <span class="kw-2">ref</span> <span class="ident">expected</span>) <span class="kw">in</span> <span class="kw-2">&</span><span class="ident">tests</span> {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">expected</span>, <span class="kw-2">&</span><span class="ident">s</span>.<span class="ident">parse</span>());
}
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_level_show</span>() {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"INFO"</span>, <span class="ident">Level</span>::<span class="ident">Info</span>.<span class="ident">to_string</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"ERROR"</span>, <span class="ident">Level</span>::<span class="ident">Error</span>.<span class="ident">to_string</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_levelfilter_show</span>() {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"OFF"</span>, <span class="ident">LevelFilter</span>::<span class="ident">Off</span>.<span class="ident">to_string</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="string">"ERROR"</span>, <span class="ident">LevelFilter</span>::<span class="ident">Error</span>.<span class="ident">to_string</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_cross_cmp</span>() {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">Level</span>::<span class="ident">Debug</span> <span class="op">></span> <span class="ident">LevelFilter</span>::<span class="ident">Error</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">LevelFilter</span>::<span class="ident">Warn</span> <span class="op"><</span> <span class="ident">Level</span>::<span class="ident">Trace</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">LevelFilter</span>::<span class="ident">Off</span> <span class="op"><</span> <span class="ident">Level</span>::<span class="ident">Error</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_cross_eq</span>() {
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">Level</span>::<span class="ident">Error</span> <span class="op">==</span> <span class="ident">LevelFilter</span>::<span class="ident">Error</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">LevelFilter</span>::<span class="ident">Off</span> <span class="op">!=</span> <span class="ident">Level</span>::<span class="ident">Error</span>);
<span class="macro">assert</span><span class="macro">!</span>(<span class="ident">Level</span>::<span class="ident">Trace</span> <span class="op">==</span> <span class="ident">LevelFilter</span>::<span class="ident">Trace</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_to_level</span>() {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="ident">Level</span>::<span class="ident">Error</span>), <span class="ident">LevelFilter</span>::<span class="ident">Error</span>.<span class="ident">to_level</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">None</span>, <span class="ident">LevelFilter</span>::<span class="ident">Off</span>.<span class="ident">to_level</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="prelude-val">Some</span>(<span class="ident">Level</span>::<span class="ident">Debug</span>), <span class="ident">LevelFilter</span>::<span class="ident">Debug</span>.<span class="ident">to_level</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_to_level_filter</span>() {
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">LevelFilter</span>::<span class="ident">Error</span>, <span class="ident">Level</span>::<span class="ident">Error</span>.<span class="ident">to_level_filter</span>());
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">LevelFilter</span>::<span class="ident">Trace</span>, <span class="ident">Level</span>::<span class="ident">Trace</span>.<span class="ident">to_level_filter</span>());
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="attribute">#[<span class="ident">cfg</span>(<span class="ident">feature</span> <span class="op">=</span> <span class="string">"std"</span>)]</span>
<span class="kw">fn</span> <span class="ident">test_error_trait</span>() {
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">SetLoggerError</span>;
<span class="kw">use</span> <span class="ident">std</span>::<span class="ident">error</span>::<span class="ident">Error</span>;
<span class="kw">let</span> <span class="ident">e</span> <span class="op">=</span> <span class="ident">SetLoggerError</span>(());
<span class="macro">assert_eq</span><span class="macro">!</span>(
<span class="ident">e</span>.<span class="ident">description</span>(),
<span class="string">"attempted to set a logger after the logging system \
was already initialized"</span>
);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_metadata_builder</span>() {
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">MetadataBuilder</span>;
<span class="kw">let</span> <span class="ident">target</span> <span class="op">=</span> <span class="string">"myApp"</span>;
<span class="kw">let</span> <span class="ident">metadata_test</span> <span class="op">=</span> <span class="ident">MetadataBuilder</span>::<span class="ident">new</span>()
.<span class="ident">level</span>(<span class="ident">Level</span>::<span class="ident">Debug</span>)
.<span class="ident">target</span>(<span class="ident">target</span>)
.<span class="ident">build</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">metadata_test</span>.<span class="ident">level</span>(), <span class="ident">Level</span>::<span class="ident">Debug</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">metadata_test</span>.<span class="ident">target</span>(), <span class="string">"myApp"</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_metadata_convenience_builder</span>() {
<span class="kw">use</span> <span class="kw">super</span>::<span class="ident">Metadata</span>;
<span class="kw">let</span> <span class="ident">target</span> <span class="op">=</span> <span class="string">"myApp"</span>;
<span class="kw">let</span> <span class="ident">metadata_test</span> <span class="op">=</span> <span class="ident">Metadata</span>::<span class="ident">builder</span>()
.<span class="ident">level</span>(<span class="ident">Level</span>::<span class="ident">Debug</span>)
.<span class="ident">target</span>(<span class="ident">target</span>)
.<span class="ident">build</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">metadata_test</span>.<span class="ident">level</span>(), <span class="ident">Level</span>::<span class="ident">Debug</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">metadata_test</span>.<span class="ident">target</span>(), <span class="string">"myApp"</span>);
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_record_builder</span>() {
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">MetadataBuilder</span>, <span class="ident">RecordBuilder</span>};
<span class="kw">let</span> <span class="ident">target</span> <span class="op">=</span> <span class="string">"myApp"</span>;
<span class="kw">let</span> <span class="ident">metadata</span> <span class="op">=</span> <span class="ident">MetadataBuilder</span>::<span class="ident">new</span>().<span class="ident">target</span>(<span class="ident">target</span>).<span class="ident">build</span>();
<span class="kw">let</span> <span class="ident">fmt_args</span> <span class="op">=</span> <span class="macro">format_args</span><span class="macro">!</span>(<span class="string">"hello"</span>);
<span class="kw">let</span> <span class="ident">record_test</span> <span class="op">=</span> <span class="ident">RecordBuilder</span>::<span class="ident">new</span>()
.<span class="ident">args</span>(<span class="ident">fmt_args</span>)
.<span class="ident">metadata</span>(<span class="ident">metadata</span>)
.<span class="ident">module_path</span>(<span class="prelude-val">Some</span>(<span class="string">"foo"</span>))
.<span class="ident">file</span>(<span class="prelude-val">Some</span>(<span class="string">"bar"</span>))
.<span class="ident">line</span>(<span class="prelude-val">Some</span>(<span class="number">30</span>))
.<span class="ident">build</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">record_test</span>.<span class="ident">metadata</span>().<span class="ident">target</span>(), <span class="string">"myApp"</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">record_test</span>.<span class="ident">module_path</span>(), <span class="prelude-val">Some</span>(<span class="string">"foo"</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">record_test</span>.<span class="ident">file</span>(), <span class="prelude-val">Some</span>(<span class="string">"bar"</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">record_test</span>.<span class="ident">line</span>(), <span class="prelude-val">Some</span>(<span class="number">30</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_record_convenience_builder</span>() {
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">Metadata</span>, <span class="ident">Record</span>};
<span class="kw">let</span> <span class="ident">target</span> <span class="op">=</span> <span class="string">"myApp"</span>;
<span class="kw">let</span> <span class="ident">metadata</span> <span class="op">=</span> <span class="ident">Metadata</span>::<span class="ident">builder</span>().<span class="ident">target</span>(<span class="ident">target</span>).<span class="ident">build</span>();
<span class="kw">let</span> <span class="ident">fmt_args</span> <span class="op">=</span> <span class="macro">format_args</span><span class="macro">!</span>(<span class="string">"hello"</span>);
<span class="kw">let</span> <span class="ident">record_test</span> <span class="op">=</span> <span class="ident">Record</span>::<span class="ident">builder</span>()
.<span class="ident">args</span>(<span class="ident">fmt_args</span>)
.<span class="ident">metadata</span>(<span class="ident">metadata</span>)
.<span class="ident">module_path</span>(<span class="prelude-val">Some</span>(<span class="string">"foo"</span>))
.<span class="ident">file</span>(<span class="prelude-val">Some</span>(<span class="string">"bar"</span>))
.<span class="ident">line</span>(<span class="prelude-val">Some</span>(<span class="number">30</span>))
.<span class="ident">build</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">record_test</span>.<span class="ident">target</span>(), <span class="string">"myApp"</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">record_test</span>.<span class="ident">module_path</span>(), <span class="prelude-val">Some</span>(<span class="string">"foo"</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">record_test</span>.<span class="ident">file</span>(), <span class="prelude-val">Some</span>(<span class="string">"bar"</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">record_test</span>.<span class="ident">line</span>(), <span class="prelude-val">Some</span>(<span class="number">30</span>));
}
<span class="attribute">#[<span class="ident">test</span>]</span>
<span class="kw">fn</span> <span class="ident">test_record_complete_builder</span>() {
<span class="kw">use</span> <span class="kw">super</span>::{<span class="ident">Level</span>, <span class="ident">Record</span>};
<span class="kw">let</span> <span class="ident">target</span> <span class="op">=</span> <span class="string">"myApp"</span>;
<span class="kw">let</span> <span class="ident">record_test</span> <span class="op">=</span> <span class="ident">Record</span>::<span class="ident">builder</span>()
.<span class="ident">module_path</span>(<span class="prelude-val">Some</span>(<span class="string">"foo"</span>))
.<span class="ident">file</span>(<span class="prelude-val">Some</span>(<span class="string">"bar"</span>))
.<span class="ident">line</span>(<span class="prelude-val">Some</span>(<span class="number">30</span>))
.<span class="ident">target</span>(<span class="ident">target</span>)
.<span class="ident">level</span>(<span class="ident">Level</span>::<span class="ident">Error</span>)
.<span class="ident">build</span>();
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">record_test</span>.<span class="ident">target</span>(), <span class="string">"myApp"</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">record_test</span>.<span class="ident">level</span>(), <span class="ident">Level</span>::<span class="ident">Error</span>);
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">record_test</span>.<span class="ident">module_path</span>(), <span class="prelude-val">Some</span>(<span class="string">"foo"</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">record_test</span>.<span class="ident">file</span>(), <span class="prelude-val">Some</span>(<span class="string">"bar"</span>));
<span class="macro">assert_eq</span><span class="macro">!</span>(<span class="ident">record_test</span>.<span class="ident">line</span>(), <span class="prelude-val">Some</span>(<span class="number">30</span>));
}
}
</pre>
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