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use std::cmp;
// Turns an `if let` into an expression so that it is possible to do
// things like:
//
// ```rust,nocompile
// if destructures_to(Foo::Bar(_) = value)
// || destructures_to(Foo::Bam(_) = value) { ... }
// ```
macro_rules! destructures_to {
( $error: pat = $expr:expr ) => {
{
let x = $expr;
if let $error = x {
true
} else {
false
}
}
};
}
macro_rules! trace {
( $TRACE:expr, $fmt:expr, $($pargs:expr),* ) => {
if $TRACE {
eprintln!($fmt, $($pargs),*);
}
};
( $TRACE:expr, $fmt:expr ) => {
trace!($TRACE, $fmt, );
};
}
// Converts an indentation level to whitespace.
pub(crate) fn indent(i: usize) -> &'static str {
let s = " ";
&s[0..cmp::min(i, s.len())]
}
macro_rules! tracer {
( $TRACE:expr, $func:expr ) => {
tracer!($TRACE, $func, 0)
};
( $TRACE:expr, $func:expr, $indent:expr ) => {
// Currently, Rust doesn't support $( ... ) in a nested
// macro's definition. See:
// https://users.rust-lang.org/t/nested-macros-issue/8348/2
macro_rules! t {
( $fmt:expr ) =>
{ trace!($TRACE, "{}{}: {}", crate::macros::indent($indent as usize), $func, $fmt) };
( $fmt:expr, $a:expr ) =>
{ trace!($TRACE, "{}{}: {}", crate::macros::indent($indent as usize), $func, format!($fmt, $a)) };
( $fmt:expr, $a:expr, $b:expr ) =>
{ trace!($TRACE, "{}{}: {}", crate::macros::indent($indent as usize), $func, format!($fmt, $a, $b)) };
( $fmt:expr, $a:expr, $b:expr, $c:expr ) =>
{ trace!($TRACE, "{}{}: {}", crate::macros::indent($indent as usize), $func, format!($fmt, $a, $b, $c)) };
( $fmt:expr, $a:expr, $b:expr, $c:expr, $d:expr ) =>
{ trace!($TRACE, "{}{}: {}", crate::macros::indent($indent as usize), $func, format!($fmt, $a, $b, $c, $d)) };
( $fmt:expr, $a:expr, $b:expr, $c:expr, $d:expr, $e:expr ) =>
{ trace!($TRACE, "{}{}: {}", crate::macros::indent($indent as usize), $func, format!($fmt, $a, $b, $c, $d, $e)) };
( $fmt:expr, $a:expr, $b:expr, $c:expr, $d:expr, $e:expr, $f:expr ) =>
{ trace!($TRACE, "{}{}: {}", crate::macros::indent($indent as usize), $func, format!($fmt, $a, $b, $c, $d, $e, $f)) };
( $fmt:expr, $a:expr, $b:expr, $c:expr, $d:expr, $e:expr, $f:expr, $g:expr ) =>
{ trace!($TRACE, "{}{}: {}", crate::macros::indent($indent as usize), $func, format!($fmt, $a, $b, $c, $d, $e, $f, $g)) };
( $fmt:expr, $a:expr, $b:expr, $c:expr, $d:expr, $e:expr, $f:expr, $g:expr, $h:expr ) =>
{ trace!($TRACE, "{}{}: {}", crate::macros::indent($indent as usize), $func, format!($fmt, $a, $b, $c, $d, $e, $f, $g, $h)) };
( $fmt:expr, $a:expr, $b:expr, $c:expr, $d:expr, $e:expr, $f:expr, $g:expr, $h:expr, $i:expr ) =>
{ trace!($TRACE, "{}{}: {}", crate::macros::indent($indent as usize), $func, format!($fmt, $a, $b, $c, $d, $e, $f, $g, $h, $i)) };
( $fmt:expr, $a:expr, $b:expr, $c:expr, $d:expr, $e:expr, $f:expr, $g:expr, $h:expr, $i:expr, $j:expr ) =>
{ trace!($TRACE, "{}{}: {}", crate::macros::indent($indent as usize), $func, format!($fmt, $a, $b, $c, $d, $e, $f, $g, $h, $i, $j)) };
( $fmt:expr, $a:expr, $b:expr, $c:expr, $d:expr, $e:expr, $f:expr, $g:expr, $h:expr, $i:expr, $j:expr, $k:expr ) =>
{ trace!($TRACE, "{}{}: {}", crate::macros::indent($indent as usize), $func, format!($fmt, $a, $b, $c, $d, $e, $f, $g, $h, $i, $j, $k)) };
}
}
}
/// A very simple profiling tool.
///
/// Note: don't ever profile code that has not been compiled in
/// release mode. There can be orders of magnitude difference in
/// execution time between it and debug mode!
///
/// This macro measures the wall time it takes to execute the block.
/// If the time is at least $ms_threshold (in milli-seconds), then it
/// displays the output on stderr. The output is prefixed with label,
/// if it is provided.
///
/// ```
/// let result = time_it!("Some code", 10, {
/// // Some code.
/// 5
/// });
/// assert_eq!(result, 5);
/// ```
#[allow(unused_macros)]
macro_rules! time_it {
( $label:expr, $ms_threshold:expr, $body:expr ) => {{
use std::time::{SystemTime, Duration};
// We use drop so that code that uses non-local exits (e.g.,
// using break 'label) still works.
struct Timer {
start: SystemTime,
};
impl Drop for Timer {
fn drop(&mut self) {
let elapsed = self.start.elapsed();
if elapsed.clone().unwrap_or(Duration::from_millis($ms_threshold))
>= Duration::from_millis($ms_threshold)
{
if $label.len() > 0 {
eprint!("{}:", $label);
}
eprintln!("{}:{}: {:?}", file!(), line!(), elapsed);
}
}
}
let _start = Timer { start: SystemTime::now() };
$body
}};
( $label:expr, $body:expr ) => {
time_it!($label, 0, $body)
};
( $body:expr ) => {
time_it!("", $body)
};
}
|
