| <!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 of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/log-0.4.18/src/macros.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>macros.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="icon" href="https://www.rust-lang.org/favicon.ico"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../log/index.html"><div class="logo-container"> |
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| </pre><pre class="rust"><code><span class="comment">// Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT |
| // file at the top-level directory of this distribution and at |
| // http://rust-lang.org/COPYRIGHT. |
| // |
| // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or |
| // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license |
| // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your |
| // option. This file may not be copied, modified, or distributed |
| // except according to those terms. |
| |
| </span><span class="doccomment">/// The standard logging macro. |
| /// |
| /// This macro will generically log with the specified `Level` and `format!` |
| /// based argument list. |
| /// |
| /// # Examples |
| /// |
| /// ```edition2018 |
| /// use log::{log, Level}; |
| /// |
| /// # fn main() { |
| /// let data = (42, "Forty-two"); |
| /// let private_data = "private"; |
| /// |
| /// log!(Level::Error, "Received errors: {}, {}", data.0, data.1); |
| /// log!(target: "app_events", Level::Warn, "App warning: {}, {}, {}", |
| /// data.0, data.1, private_data); |
| /// # } |
| /// ``` |
| </span><span class="attribute">#[macro_export(local_inner_macros)] |
| </span><span class="macro">macro_rules! </span>log { |
| <span class="comment">// log!(target: "my_target", Level::Info, key1 = 42, key2 = true; "a {} event", "log"); |
| </span>(target: <span class="macro-nonterminal">$target</span>:expr, <span class="macro-nonterminal">$lvl</span>:expr, $(<span class="macro-nonterminal">$key</span>:tt = <span class="macro-nonterminal">$value</span>:expr),+; $(<span class="macro-nonterminal">$arg</span>:tt)+) => ({ |
| <span class="kw">let </span>lvl = <span class="macro-nonterminal">$lvl</span>; |
| <span class="kw">if </span>lvl <= <span class="macro-nonterminal">$crate::STATIC_MAX_LEVEL </span>&& lvl <= <span class="macro-nonterminal">$crate::max_level</span>() { |
| <span class="macro-nonterminal">$crate::__private_api_log</span>( |
| <span class="macro">__log_format_args!</span>($(<span class="macro-nonterminal">$arg</span>)+), |
| lvl, |
| <span class="kw-2">&</span>(<span class="macro-nonterminal">$target</span>, <span class="macro">__log_module_path!</span>(), <span class="macro">__log_file!</span>(), <span class="macro">__log_line!</span>()), |
| <span class="macro-nonterminal">$crate::__private_api::Option::Some</span>(<span class="kw-2">&</span>[$((<span class="macro">__log_key!</span>(<span class="macro-nonterminal">$key</span>), <span class="kw-2">&</span><span class="macro-nonterminal">$value</span>)),+]) |
| ); |
| } |
| }); |
| |
| <span class="comment">// log!(target: "my_target", Level::Info, "a {} event", "log"); |
| </span>(target: <span class="macro-nonterminal">$target</span>:expr, <span class="macro-nonterminal">$lvl</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) => ({ |
| <span class="kw">let </span>lvl = <span class="macro-nonterminal">$lvl</span>; |
| <span class="kw">if </span>lvl <= <span class="macro-nonterminal">$crate::STATIC_MAX_LEVEL </span>&& lvl <= <span class="macro-nonterminal">$crate::max_level</span>() { |
| <span class="macro-nonterminal">$crate::__private_api_log</span>( |
| <span class="macro">__log_format_args!</span>($(<span class="macro-nonterminal">$arg</span>)+), |
| lvl, |
| <span class="kw-2">&</span>(<span class="macro-nonterminal">$target</span>, <span class="macro">__log_module_path!</span>(), <span class="macro">__log_file!</span>(), <span class="macro">__log_line!</span>()), |
| <span class="macro-nonterminal">$crate::__private_api::Option::None</span>, |
| ); |
| } |
| }); |
| |
| <span class="comment">// log!(Level::Info, "a log event") |
| </span>(<span class="macro-nonterminal">$lvl</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro">log!</span>(target: <span class="macro">__log_module_path!</span>(), <span class="macro-nonterminal">$lvl</span>, $(<span class="macro-nonterminal">$arg</span>)+)); |
| } |
| |
| <span class="doccomment">/// Logs a message at the error level. |
| /// |
| /// # Examples |
| /// |
| /// ```edition2018 |
| /// use log::error; |
| /// |
| /// # fn main() { |
| /// let (err_info, port) = ("No connection", 22); |
| /// |
| /// error!("Error: {} on port {}", err_info, port); |
| /// error!(target: "app_events", "App Error: {}, Port: {}", err_info, 22); |
| /// # } |
| /// ``` |
| </span><span class="attribute">#[macro_export(local_inner_macros)] |
| </span><span class="macro">macro_rules! </span>error { |
| <span class="comment">// error!(target: "my_target", key1 = 42, key2 = true; "a {} event", "log") |
| // error!(target: "my_target", "a {} event", "log") |
| </span>(target: <span class="macro-nonterminal">$target</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro">log!</span>(target: <span class="macro-nonterminal">$target</span>, <span class="macro-nonterminal">$crate::Level::Error</span>, $(<span class="macro-nonterminal">$arg</span>)+)); |
| |
| <span class="comment">// error!("a {} event", "log") |
| </span>($(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro">log!</span>(<span class="macro-nonterminal">$crate::Level::Error</span>, $(<span class="macro-nonterminal">$arg</span>)+)) |
| } |
| |
| <span class="doccomment">/// Logs a message at the warn level. |
| /// |
| /// # Examples |
| /// |
| /// ```edition2018 |
| /// use log::warn; |
| /// |
| /// # fn main() { |
| /// let warn_description = "Invalid Input"; |
| /// |
| /// warn!("Warning! {}!", warn_description); |
| /// warn!(target: "input_events", "App received warning: {}", warn_description); |
| /// # } |
| /// ``` |
| </span><span class="attribute">#[macro_export(local_inner_macros)] |
| </span><span class="macro">macro_rules! </span>warn { |
| <span class="comment">// warn!(target: "my_target", key1 = 42, key2 = true; "a {} event", "log") |
| // warn!(target: "my_target", "a {} event", "log") |
| </span>(target: <span class="macro-nonterminal">$target</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro">log!</span>(target: <span class="macro-nonterminal">$target</span>, <span class="macro-nonterminal">$crate::Level::Warn</span>, $(<span class="macro-nonterminal">$arg</span>)+)); |
| |
| <span class="comment">// warn!("a {} event", "log") |
| </span>($(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro">log!</span>(<span class="macro-nonterminal">$crate::Level::Warn</span>, $(<span class="macro-nonterminal">$arg</span>)+)) |
| } |
| |
| <span class="doccomment">/// Logs a message at the info level. |
| /// |
| /// # Examples |
| /// |
| /// ```edition2018 |
| /// use log::info; |
| /// |
| /// # fn main() { |
| /// # struct Connection { port: u32, speed: f32 } |
| /// let conn_info = Connection { port: 40, speed: 3.20 }; |
| /// |
| /// info!("Connected to port {} at {} Mb/s", conn_info.port, conn_info.speed); |
| /// info!(target: "connection_events", "Successful connection, port: {}, speed: {}", |
| /// conn_info.port, conn_info.speed); |
| /// # } |
| /// ``` |
| </span><span class="attribute">#[macro_export(local_inner_macros)] |
| </span><span class="macro">macro_rules! </span>info { |
| <span class="comment">// info!(target: "my_target", key1 = 42, key2 = true; "a {} event", "log") |
| // info!(target: "my_target", "a {} event", "log") |
| </span>(target: <span class="macro-nonterminal">$target</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro">log!</span>(target: <span class="macro-nonterminal">$target</span>, <span class="macro-nonterminal">$crate::Level::Info</span>, $(<span class="macro-nonterminal">$arg</span>)+)); |
| |
| <span class="comment">// info!("a {} event", "log") |
| </span>($(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro">log!</span>(<span class="macro-nonterminal">$crate::Level::Info</span>, $(<span class="macro-nonterminal">$arg</span>)+)) |
| } |
| |
| <span class="doccomment">/// Logs a message at the debug level. |
| /// |
| /// # Examples |
| /// |
| /// ```edition2018 |
| /// use log::debug; |
| /// |
| /// # fn main() { |
| /// # struct Position { x: f32, y: f32 } |
| /// let pos = Position { x: 3.234, y: -1.223 }; |
| /// |
| /// debug!("New position: x: {}, y: {}", pos.x, pos.y); |
| /// debug!(target: "app_events", "New position: x: {}, y: {}", pos.x, pos.y); |
| /// # } |
| /// ``` |
| </span><span class="attribute">#[macro_export(local_inner_macros)] |
| </span><span class="macro">macro_rules! </span>debug { |
| <span class="comment">// debug!(target: "my_target", key1 = 42, key2 = true; "a {} event", "log") |
| // debug!(target: "my_target", "a {} event", "log") |
| </span>(target: <span class="macro-nonterminal">$target</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro">log!</span>(target: <span class="macro-nonterminal">$target</span>, <span class="macro-nonterminal">$crate::Level::Debug</span>, $(<span class="macro-nonterminal">$arg</span>)+)); |
| |
| <span class="comment">// debug!("a {} event", "log") |
| </span>($(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro">log!</span>(<span class="macro-nonterminal">$crate::Level::Debug</span>, $(<span class="macro-nonterminal">$arg</span>)+)) |
| } |
| |
| <span class="doccomment">/// Logs a message at the trace level. |
| /// |
| /// # Examples |
| /// |
| /// ```edition2018 |
| /// use log::trace; |
| /// |
| /// # fn main() { |
| /// # struct Position { x: f32, y: f32 } |
| /// let pos = Position { x: 3.234, y: -1.223 }; |
| /// |
| /// trace!("Position is: x: {}, y: {}", pos.x, pos.y); |
| /// trace!(target: "app_events", "x is {} and y is {}", |
| /// if pos.x >= 0.0 { "positive" } else { "negative" }, |
| /// if pos.y >= 0.0 { "positive" } else { "negative" }); |
| /// # } |
| /// ``` |
| </span><span class="attribute">#[macro_export(local_inner_macros)] |
| </span><span class="macro">macro_rules! </span>trace { |
| <span class="comment">// trace!(target: "my_target", key1 = 42, key2 = true; "a {} event", "log") |
| // trace!(target: "my_target", "a {} event", "log") |
| </span>(target: <span class="macro-nonterminal">$target</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro">log!</span>(target: <span class="macro-nonterminal">$target</span>, <span class="macro-nonterminal">$crate::Level::Trace</span>, $(<span class="macro-nonterminal">$arg</span>)+)); |
| |
| <span class="comment">// trace!("a {} event", "log") |
| </span>($(<span class="macro-nonterminal">$arg</span>:tt)+) => (<span class="macro">log!</span>(<span class="macro-nonterminal">$crate::Level::Trace</span>, $(<span class="macro-nonterminal">$arg</span>)+)) |
| } |
| |
| <span class="doccomment">/// Determines if a message logged at the specified level in that module will |
| /// be logged. |
| /// |
| /// This can be used to avoid expensive computation of log message arguments if |
| /// the message would be ignored anyway. |
| /// |
| /// # Examples |
| /// |
| /// ```edition2018 |
| /// use log::Level::Debug; |
| /// use log::{debug, log_enabled}; |
| /// |
| /// # fn foo() { |
| /// if log_enabled!(Debug) { |
| /// let data = expensive_call(); |
| /// debug!("expensive debug data: {} {}", data.x, data.y); |
| /// } |
| /// if log_enabled!(target: "Global", Debug) { |
| /// let data = expensive_call(); |
| /// debug!(target: "Global", "expensive debug data: {} {}", data.x, data.y); |
| /// } |
| /// # } |
| /// # struct Data { x: u32, y: u32 } |
| /// # fn expensive_call() -> Data { Data { x: 0, y: 0 } } |
| /// # fn main() {} |
| /// ``` |
| </span><span class="attribute">#[macro_export(local_inner_macros)] |
| </span><span class="macro">macro_rules! </span>log_enabled { |
| (target: <span class="macro-nonterminal">$target</span>:expr, <span class="macro-nonterminal">$lvl</span>:expr) => {{ |
| <span class="kw">let </span>lvl = <span class="macro-nonterminal">$lvl</span>; |
| lvl <= <span class="macro-nonterminal">$crate::STATIC_MAX_LEVEL |
| </span>&& lvl <= <span class="macro-nonterminal">$crate::max_level</span>() |
| && <span class="macro-nonterminal">$crate::__private_api_enabled</span>(lvl, <span class="macro-nonterminal">$target</span>) |
| }}; |
| (<span class="macro-nonterminal">$lvl</span>:expr) => { |
| <span class="macro">log_enabled!</span>(target: <span class="macro">__log_module_path!</span>(), <span class="macro-nonterminal">$lvl</span>) |
| }; |
| } |
| |
| <span class="comment">// The log macro above cannot invoke format_args directly because it uses |
| // local_inner_macros. A format_args invocation there would resolve to |
| // $crate::format_args which does not exist. Instead invoke format_args here |
| // outside of local_inner_macros so that it resolves (probably) to |
| // core::format_args or std::format_args. Same for the several macros that |
| // follow. |
| // |
| // This is a workaround until we drop support for pre-1.30 compilers. At that |
| // point we can remove use of local_inner_macros, use $crate:: when invoking |
| // local macros, and invoke format_args directly. |
| </span><span class="attribute">#[doc(hidden)] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>__log_format_args { |
| ($(<span class="macro-nonterminal">$args</span>:tt)<span class="kw-2">*</span>) => { |
| <span class="macro">format_args!</span>($(<span class="macro-nonterminal">$args</span>)<span class="kw-2">*</span>) |
| }; |
| } |
| |
| <span class="attribute">#[doc(hidden)] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>__log_module_path { |
| () => { |
| <span class="macro">module_path!</span>() |
| }; |
| } |
| |
| <span class="attribute">#[doc(hidden)] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>__log_file { |
| () => { |
| <span class="macro">file!</span>() |
| }; |
| } |
| |
| <span class="attribute">#[doc(hidden)] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>__log_line { |
| () => { |
| <span class="macro">line!</span>() |
| }; |
| } |
| |
| <span class="attribute">#[doc(hidden)] |
| #[macro_export] |
| </span><span class="macro">macro_rules! </span>__log_key { |
| <span class="comment">// key1 = 42 |
| </span>($(<span class="macro-nonterminal">$args</span>:ident)<span class="kw-2">*</span>) => { |
| <span class="macro">stringify!</span>($(<span class="macro-nonterminal">$args</span>)<span class="kw-2">*</span>) |
| }; |
| <span class="comment">// "key1" = 42 |
| </span>($(<span class="macro-nonterminal">$args</span>:expr)<span class="kw-2">*</span>) => { |
| $(<span class="macro-nonterminal">$args</span>)* |
| }; |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="log" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |