mirror of
https://github.com/sile/hls_m3u8.git
synced 2024-05-24 03:08:23 +00:00
100 lines
2.8 KiB
Rust
100 lines
2.8 KiB
Rust
use crate::{Error, ErrorKind, Result};
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use std::fmt;
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use std::str::{self, FromStr};
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use std::time::Duration;
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use trackable::error::ErrorKindExt;
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/// Non-negative decimal floating-point number.
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///
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/// See: [4.2. Attribute Lists]
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///
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/// [4.2. Attribute Lists]: https://tools.ietf.org/html/rfc8216#section-4.2
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#[derive(Debug, Clone, Copy, PartialEq, PartialOrd)]
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pub struct DecimalFloatingPoint(f64);
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impl DecimalFloatingPoint {
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/// Makes a new `DecimalFloatingPoint` instance.
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///
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/// # Errors
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///
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/// The given value must have a positive sign and be finite,
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/// otherwise this function will return an error that has the kind `ErrorKind::InvalidInput`.
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pub fn new(n: f64) -> Result<Self> {
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track_assert!(n.is_sign_positive(), ErrorKind::InvalidInput);
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track_assert!(n.is_finite(), ErrorKind::InvalidInput);
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Ok(DecimalFloatingPoint(n))
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}
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/// Converts `DecimalFloatingPoint` to `f64`.
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pub fn as_f64(self) -> f64 {
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self.0
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}
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pub(crate) fn to_duration(self) -> Duration {
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let secs = self.0 as u64;
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let nanos = (self.0.fract() * 1_000_000_000.0) as u32;
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Duration::new(secs, nanos)
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}
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pub(crate) fn from_duration(duration: Duration) -> Self {
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let n =
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(duration.as_secs() as f64) + (f64::from(duration.subsec_nanos()) / 1_000_000_000.0);
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DecimalFloatingPoint(n)
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}
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}
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impl From<u32> for DecimalFloatingPoint {
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fn from(f: u32) -> Self {
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DecimalFloatingPoint(f64::from(f))
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}
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}
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impl Eq for DecimalFloatingPoint {}
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impl fmt::Display for DecimalFloatingPoint {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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self.0.fmt(f)
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}
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}
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impl FromStr for DecimalFloatingPoint {
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type Err = Error;
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fn from_str(s: &str) -> Result<Self> {
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track_assert!(
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s.chars().all(|c| c.is_digit(10) || c == '.'),
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ErrorKind::InvalidInput
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);
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let n = track!(s.parse().map_err(|e| ErrorKind::InvalidInput.cause(e)))?;
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Ok(DecimalFloatingPoint(n))
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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#[test]
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pub fn test_display() {
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let decimal_floating_point = DecimalFloatingPoint::new(22.0).unwrap();
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assert_eq!(decimal_floating_point.to_string(), "22".to_string());
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let decimal_floating_point = DecimalFloatingPoint::new(4.1).unwrap();
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assert_eq!(decimal_floating_point.to_string(), "4.1".to_string());
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}
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#[test]
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pub fn test_parse() {
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let decimal_floating_point = DecimalFloatingPoint::new(22.0).unwrap();
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assert_eq!(
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decimal_floating_point,
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"22".parse::<DecimalFloatingPoint>().unwrap()
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);
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let decimal_floating_point = DecimalFloatingPoint::new(4.1).unwrap();
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assert_eq!(
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decimal_floating_point,
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"4.1".parse::<DecimalFloatingPoint>().unwrap()
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);
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}
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}
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