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use crate::ty::{time_ty, Type};
use num::{traits::*, BigInt, BigRational};
use std::fmt::{Debug, Display};
#[derive(Clone, PartialOrd, Ord, PartialEq, Eq, Hash, Serialize, Deserialize)]
pub struct TimeValue {
pub time: BigRational,
pub delta: usize,
pub epsilon: usize,
}
impl TimeValue {
pub fn new(time: BigRational, delta: usize, epsilon: usize) -> Self {
TimeValue {
time,
delta,
epsilon,
}
}
pub fn zero() -> Self {
TimeValue {
time: BigRational::zero(),
delta: 0,
epsilon: 0,
}
}
pub fn ty(&self) -> Type {
time_ty()
}
pub fn time(&self) -> &BigRational {
&self.time
}
pub fn delta(&self) -> usize {
self.delta
}
pub fn epsilon(&self) -> usize {
self.epsilon
}
pub fn is_zero(&self) -> bool {
self.time.is_zero() && self.delta.is_zero() && self.epsilon.is_zero()
}
}
impl Display for TimeValue {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write_ratio_as_si(&self.time, f)?;
if !self.delta.is_zero() {
write!(f, " {}d", self.delta)?;
}
if !self.epsilon.is_zero() {
write!(f, " {}e", self.epsilon)?;
}
Ok(())
}
}
impl Debug for TimeValue {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}", self)
}
}
fn write_ratio_as_si(ratio: &BigRational, f: &mut std::fmt::Formatter) -> std::fmt::Result {
if ratio.is_zero() {
return write!(f, "0s");
}
let prefices = ["", "m", "u", "n", "p", "f", "a"];
let mut scaled = ratio.clone();
let mut prefix = 0;
let mut shift = 0;
while prefix + 1 < prefices.len() && shift < 9 {
if scaled >= One::one() {
if scaled.is_integer() {
break;
} else {
shift += 3;
}
} else {
prefix += 1;
}
scaled = scaled * BigRational::from_integer(BigInt::from(1000));
}
let rounded = format!("{}", scaled.round());
if shift > 0 {
write!(
f,
"{}.{}{}s",
&rounded[..rounded.len() - shift],
&rounded[rounded.len() - shift..],
prefices[prefix]
)?;
} else {
write!(f, "{}{}s", rounded, prefices[prefix])?;
}
Ok(())
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn time_formatting() {
let make = |num: usize, denom: usize, delta: usize, epsilon: usize| {
format!(
"{}",
TimeValue::new(
BigRational::new(num.into(), denom.into()),
delta.into(),
epsilon.into()
)
)
};
assert_eq!(make(0, 1, 0, 0), "0s");
assert_eq!(make(0, 1, 0, 1), "0s 1e");
assert_eq!(make(0, 1, 1, 0), "0s 1d");
assert_eq!(make(0, 1, 1, 1), "0s 1d 1e");
assert_eq!(make(1, 1, 0, 0), "1s");
assert_eq!(make(1, 1, 0, 1), "1s 1e");
assert_eq!(make(1, 1, 1, 0), "1s 1d");
assert_eq!(make(1, 1, 1, 1), "1s 1d 1e");
assert_eq!(make(1, 10, 0, 0), "100ms");
assert_eq!(make(1, 100, 0, 0), "10ms");
assert_eq!(make(1, 1000, 0, 0), "1ms");
assert_eq!(make(1, 10000, 0, 0), "100us");
assert_eq!(make(1, 100000, 0, 0), "10us");
assert_eq!(make(1, 1000000, 0, 0), "1us");
assert_eq!(make(1, 10000000, 0, 0), "100ns");
assert_eq!(make(1, 100000000, 0, 0), "10ns");
assert_eq!(make(1, 1000000000, 0, 0), "1ns");
assert_eq!(make(1, 10000000000, 0, 0), "100ps");
assert_eq!(make(1, 100000000000, 0, 0), "10ps");
assert_eq!(make(1, 1000000000000, 0, 0), "1ps");
assert_eq!(make(1, 10000000000000, 0, 0), "100fs");
assert_eq!(make(1, 100000000000000, 0, 0), "10fs");
assert_eq!(make(1, 1000000000000000, 0, 0), "1fs");
assert_eq!(make(1, 10000000000000000, 0, 0), "100as");
assert_eq!(make(1, 100000000000000000, 0, 0), "10as");
assert_eq!(make(1, 1000000000000000000, 0, 0), "1as");
assert_eq!(make(500, 1, 0, 0), "500s");
assert_eq!(make(50, 1, 0, 0), "50s");
assert_eq!(make(5, 1, 0, 0), "5s");
assert_eq!(make(5, 10, 0, 0), "500ms");
assert_eq!(make(5, 100, 0, 0), "50ms");
assert_eq!(make(5, 1000, 0, 0), "5ms");
assert_eq!(make(1, 3, 0, 0), "333.333333333ms");
}
}