mirror of
https://github.com/sile/hls_m3u8.git
synced 2024-06-02 05:02:43 +00:00
138 lines
3.7 KiB
Rust
138 lines
3.7 KiB
Rust
use core::str::FromStr;
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use derive_more::{Deref, Display};
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use crate::Error;
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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]:
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/// https://tools.ietf.org/html/draft-pantos-hls-rfc8216bis-05#section-4.2
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#[derive(Deref, Default, Debug, Clone, Copy, PartialEq, PartialOrd, Display)]
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pub(crate) 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
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/// `ErrorKind::InvalidInput`.
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pub fn new(value: f64) -> crate::Result<Self> {
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if value.is_sign_negative() || value.is_infinite() || value.is_nan() {
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return Err(Error::invalid_input());
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}
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Ok(Self(value))
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}
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pub(crate) const fn from_f64_unchecked(value: f64) -> Self { Self(value) }
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/// Converts [`DecimalFloatingPoint`] to [`f64`].
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pub const fn as_f64(self) -> f64 { self.0 }
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}
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// this trait is implemented manually, so it doesn't construct a
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// [`DecimalFloatingPoint`], with a negative value.
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impl FromStr for DecimalFloatingPoint {
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type Err = Error;
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fn from_str(input: &str) -> Result<Self, Self::Err> {
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Self::new(input.parse().map_err(Error::parse_float)?)
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}
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}
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#[doc(hidden)]
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impl From<f64> for DecimalFloatingPoint {
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fn from(value: f64) -> Self {
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let mut result = value;
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// guard against the unlikely case of an infinite value...
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if result.is_infinite() || result.is_nan() {
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result = 0.0;
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}
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Self(result.abs())
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}
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}
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#[doc(hidden)]
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impl From<f32> for DecimalFloatingPoint {
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fn from(value: f32) -> Self { f64::from(value).into() }
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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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use pretty_assertions::assert_eq;
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macro_rules! test_from {
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( $($input:expr),* ) => {
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use ::core::convert::From;
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#[test]
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fn test_from() {
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$(
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assert_eq!(
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DecimalFloatingPoint::from($input),
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DecimalFloatingPoint::new(1.0).unwrap(),
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);
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)*
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}
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}
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}
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test_from![1_u8, 1_u16, 1_u32, 1.0_f32, -1.0_f32, 1.0_f64, -1.0_f64];
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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_parser() {
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assert_eq!(
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DecimalFloatingPoint::new(22.0).unwrap(),
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"22".parse::<DecimalFloatingPoint>().unwrap()
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);
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assert_eq!(
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DecimalFloatingPoint::new(4.1).unwrap(),
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"4.1".parse::<DecimalFloatingPoint>().unwrap()
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);
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assert!("1#".parse::<DecimalFloatingPoint>().is_err());
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assert!("-1.0".parse::<DecimalFloatingPoint>().is_err());
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}
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#[test]
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fn test_new() {
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assert!(DecimalFloatingPoint::new(::std::f64::INFINITY).is_err());
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assert!(DecimalFloatingPoint::new(-1.0).is_err());
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}
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#[test]
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fn test_as_f64() {
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assert_eq!(DecimalFloatingPoint::new(1.0).unwrap().as_f64(), 1.0);
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}
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#[test]
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fn test_from_inf() {
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assert_eq!(
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DecimalFloatingPoint::from(::std::f64::INFINITY),
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DecimalFloatingPoint::new(0.0).unwrap()
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);
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}
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#[test]
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fn test_deref() {
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assert_eq!(DecimalFloatingPoint::from(0.1).floor(), 0.0);
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}
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}
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