blob: e5ccf98602404fc39fc8c641b3dc5082f76e75ad [file] [log] [blame]
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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 &lt;LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0&gt; or the MIT license
// &lt;LICENSE-MIT or http://opensource.org/licenses/MIT&gt;, 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, &quot;Forty-two&quot;);
/// let private_data = &quot;private&quot;;
///
/// log!(Level::Error, &quot;Received errors: {}, {}&quot;, data.0, data.1);
/// log!(target: &quot;app_events&quot;, Level::Warn, &quot;App warning: {}, {}, {}&quot;,
/// 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: &quot;my_target&quot;, Level::Info, key1 = 42, key2 = true; &quot;a {} event&quot;, &quot;log&quot;);
</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)+) =&gt; ({
<span class="kw">let </span>lvl = <span class="macro-nonterminal">$lvl</span>;
<span class="kw">if </span>lvl &lt;= <span class="macro-nonterminal">$crate::STATIC_MAX_LEVEL </span>&amp;&amp; lvl &lt;= <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">&amp;</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">&amp;</span>[$((<span class="macro">__log_key!</span>(<span class="macro-nonterminal">$key</span>), <span class="kw-2">&amp;</span><span class="macro-nonterminal">$value</span>)),+])
);
}
});
<span class="comment">// log!(target: &quot;my_target&quot;, Level::Info, &quot;a {} event&quot;, &quot;log&quot;);
</span>(target: <span class="macro-nonterminal">$target</span>:expr, <span class="macro-nonterminal">$lvl</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) =&gt; ({
<span class="kw">let </span>lvl = <span class="macro-nonterminal">$lvl</span>;
<span class="kw">if </span>lvl &lt;= <span class="macro-nonterminal">$crate::STATIC_MAX_LEVEL </span>&amp;&amp; lvl &lt;= <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">&amp;</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, &quot;a log event&quot;)
</span>(<span class="macro-nonterminal">$lvl</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) =&gt; (<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) = (&quot;No connection&quot;, 22);
///
/// error!(&quot;Error: {} on port {}&quot;, err_info, port);
/// error!(target: &quot;app_events&quot;, &quot;App Error: {}, Port: {}&quot;, 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: &quot;my_target&quot;, key1 = 42, key2 = true; &quot;a {} event&quot;, &quot;log&quot;)
// error!(target: &quot;my_target&quot;, &quot;a {} event&quot;, &quot;log&quot;)
</span>(target: <span class="macro-nonterminal">$target</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) =&gt; (<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!(&quot;a {} event&quot;, &quot;log&quot;)
</span>($(<span class="macro-nonterminal">$arg</span>:tt)+) =&gt; (<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 = &quot;Invalid Input&quot;;
///
/// warn!(&quot;Warning! {}!&quot;, warn_description);
/// warn!(target: &quot;input_events&quot;, &quot;App received warning: {}&quot;, warn_description);
/// # }
/// ```
</span><span class="attribute">#[macro_export(local_inner_macros)]
</span><span class="macro">macro_rules! </span>warn {
<span class="comment">// warn!(target: &quot;my_target&quot;, key1 = 42, key2 = true; &quot;a {} event&quot;, &quot;log&quot;)
// warn!(target: &quot;my_target&quot;, &quot;a {} event&quot;, &quot;log&quot;)
</span>(target: <span class="macro-nonterminal">$target</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) =&gt; (<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!(&quot;a {} event&quot;, &quot;log&quot;)
</span>($(<span class="macro-nonterminal">$arg</span>:tt)+) =&gt; (<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!(&quot;Connected to port {} at {} Mb/s&quot;, conn_info.port, conn_info.speed);
/// info!(target: &quot;connection_events&quot;, &quot;Successful connection, port: {}, speed: {}&quot;,
/// 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: &quot;my_target&quot;, key1 = 42, key2 = true; &quot;a {} event&quot;, &quot;log&quot;)
// info!(target: &quot;my_target&quot;, &quot;a {} event&quot;, &quot;log&quot;)
</span>(target: <span class="macro-nonterminal">$target</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) =&gt; (<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!(&quot;a {} event&quot;, &quot;log&quot;)
</span>($(<span class="macro-nonterminal">$arg</span>:tt)+) =&gt; (<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!(&quot;New position: x: {}, y: {}&quot;, pos.x, pos.y);
/// debug!(target: &quot;app_events&quot;, &quot;New position: x: {}, y: {}&quot;, 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: &quot;my_target&quot;, key1 = 42, key2 = true; &quot;a {} event&quot;, &quot;log&quot;)
// debug!(target: &quot;my_target&quot;, &quot;a {} event&quot;, &quot;log&quot;)
</span>(target: <span class="macro-nonterminal">$target</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) =&gt; (<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!(&quot;a {} event&quot;, &quot;log&quot;)
</span>($(<span class="macro-nonterminal">$arg</span>:tt)+) =&gt; (<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!(&quot;Position is: x: {}, y: {}&quot;, pos.x, pos.y);
/// trace!(target: &quot;app_events&quot;, &quot;x is {} and y is {}&quot;,
/// if pos.x &gt;= 0.0 { &quot;positive&quot; } else { &quot;negative&quot; },
/// if pos.y &gt;= 0.0 { &quot;positive&quot; } else { &quot;negative&quot; });
/// # }
/// ```
</span><span class="attribute">#[macro_export(local_inner_macros)]
</span><span class="macro">macro_rules! </span>trace {
<span class="comment">// trace!(target: &quot;my_target&quot;, key1 = 42, key2 = true; &quot;a {} event&quot;, &quot;log&quot;)
// trace!(target: &quot;my_target&quot;, &quot;a {} event&quot;, &quot;log&quot;)
</span>(target: <span class="macro-nonterminal">$target</span>:expr, $(<span class="macro-nonterminal">$arg</span>:tt)+) =&gt; (<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!(&quot;a {} event&quot;, &quot;log&quot;)
</span>($(<span class="macro-nonterminal">$arg</span>:tt)+) =&gt; (<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!(&quot;expensive debug data: {} {}&quot;, data.x, data.y);
/// }
/// if log_enabled!(target: &quot;Global&quot;, Debug) {
/// let data = expensive_call();
/// debug!(target: &quot;Global&quot;, &quot;expensive debug data: {} {}&quot;, data.x, data.y);
/// }
/// # }
/// # struct Data { x: u32, y: u32 }
/// # fn expensive_call() -&gt; 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) =&gt; {{
<span class="kw">let </span>lvl = <span class="macro-nonterminal">$lvl</span>;
lvl &lt;= <span class="macro-nonterminal">$crate::STATIC_MAX_LEVEL
</span>&amp;&amp; lvl &lt;= <span class="macro-nonterminal">$crate::max_level</span>()
&amp;&amp; <span class="macro-nonterminal">$crate::__private_api_enabled</span>(lvl, <span class="macro-nonterminal">$target</span>)
}};
(<span class="macro-nonterminal">$lvl</span>:expr) =&gt; {
<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">$args</span>:tt)<span class="kw-2">*</span>) =&gt; {
<span class="macro">format_args!</span>($(<span class="macro-nonterminal">$args</span>)<span class="kw-2">*</span>)
};
}
<span class="attribute">#[doc(hidden)]
#[macro_export]
</span><span class="macro">macro_rules! </span>__log_module_path {
() =&gt; {
<span class="macro">module_path!</span>()
};
}
<span class="attribute">#[doc(hidden)]
#[macro_export]
</span><span class="macro">macro_rules! </span>__log_file {
() =&gt; {
<span class="macro">file!</span>()
};
}
<span class="attribute">#[doc(hidden)]
#[macro_export]
</span><span class="macro">macro_rules! </span>__log_line {
() =&gt; {
<span class="macro">line!</span>()
};
}
<span class="attribute">#[doc(hidden)]
#[macro_export]
</span><span class="macro">macro_rules! </span>__log_key {
<span class="comment">// key1 = 42
</span>($(<span class="macro-nonterminal">$args</span>:ident)<span class="kw-2">*</span>) =&gt; {
<span class="macro">stringify!</span>($(<span class="macro-nonterminal">$args</span>)<span class="kw-2">*</span>)
};
<span class="comment">// &quot;key1&quot; = 42
</span>($(<span class="macro-nonterminal">$args</span>:expr)<span class="kw-2">*</span>) =&gt; {
$(<span class="macro-nonterminal">$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>