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pub fn change(pct: f64, signed: bool) -> String {
if signed {
format!("{:>+6}%", signed_short(pct * 1e2))
} else {
format!("{:>6}%", short(pct * 1e2))
}
}
pub fn time(ns: f64) -> String {
if ns < 1.0 {
format!("{:>6} ps", short(ns * 1e3))
} else if ns < 10f64.powi(3) {
format!("{:>6} ns", short(ns))
} else if ns < 10f64.powi(6) {
format!("{:>6} us", short(ns / 1e3))
} else if ns < 10f64.powi(9) {
format!("{:>6} ms", short(ns / 1e6))
} else {
format!("{:>6} s", short(ns / 1e9))
}
}
pub fn short(n: f64) -> String {
if n < 10.0 {
format!("{:.4}", n)
} else if n < 100.0 {
format!("{:.3}", n)
} else if n < 1000.0 {
format!("{:.2}", n)
} else if n < 10000.0 {
format!("{:.1}", n)
} else {
format!("{:.0}", n)
}
}
fn signed_short(n: f64) -> String {
let n_abs = n.abs();
if n_abs < 10.0 {
format!("{:+.4}", n)
} else if n_abs < 100.0 {
format!("{:+.3}", n)
} else if n_abs < 1000.0 {
format!("{:+.2}", n)
} else if n_abs < 10000.0 {
format!("{:+.1}", n)
} else {
format!("{:+.0}", n)
}
}
pub fn iter_count(iterations: u64) -> String {
if iterations < 10_000 {
format!("{} iterations", iterations)
} else if iterations < 1_000_000 {
format!("{:.0}k iterations", (iterations as f64) / 1000.0)
} else if iterations < 10_000_000 {
format!("{:.1}M iterations", (iterations as f64) / (1000.0 * 1000.0))
} else if iterations < 1_000_000_000 {
format!("{:.0}M iterations", (iterations as f64) / (1000.0 * 1000.0))
} else if iterations < 10_000_000_000 {
format!(
"{:.1}B iterations",
(iterations as f64) / (1000.0 * 1000.0 * 1000.0)
)
} else {
format!(
"{:.0}B iterations",
(iterations as f64) / (1000.0 * 1000.0 * 1000.0)
)
}
}
pub fn integer(n: f64) -> String {
format!("{}", n as u64)
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn short_max_len() {
let mut float = 1.0;
while float < 999_999.9 {
let string = short(float);
println!("{}", string);
assert!(string.len() <= 6);
float *= 2.0;
}
}
#[test]
fn signed_short_max_len() {
let mut float = -1.0;
while float > -999_999.9 {
let string = signed_short(float);
println!("{}", string);
assert!(string.len() <= 7);
float *= 2.0;
}
}
}
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