use std::fmt; use std::str::FromStr; use crate::types::ProtocolVersion; use crate::utils::tag; use crate::Error; /// [4.3.1.2. EXT-X-VERSION] /// /// [4.3.1.2. EXT-X-VERSION]: https://tools.ietf.org/html/rfc8216#section-4.3.1.2 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)] pub struct ExtXVersion(ProtocolVersion); impl ExtXVersion { pub(crate) const PREFIX: &'static str = "#EXT-X-VERSION:"; /// Makes a new `ExtXVersion` tag. pub const fn new(version: ProtocolVersion) -> Self { Self(version) } /// Returns the protocol compatibility version of the playlist containing this tag. pub const fn version(&self) -> ProtocolVersion { self.0 } /// Returns the protocol compatibility version that this tag requires. pub const fn requires_version(&self) -> ProtocolVersion { ProtocolVersion::V1 } } impl fmt::Display for ExtXVersion { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "{}{}", Self::PREFIX, self.0) } } impl Default for ExtXVersion { fn default() -> Self { Self(ProtocolVersion::V1) } } impl From for ExtXVersion { fn from(value: ProtocolVersion) -> Self { Self(value) } } impl FromStr for ExtXVersion { type Err = Error; fn from_str(input: &str) -> Result { let version = tag(input, Self::PREFIX)?.parse()?; Ok(ExtXVersion::new(version)) } } #[cfg(test)] mod test { use super::*; #[test] fn test_display() { assert_eq!( ExtXVersion::new(ProtocolVersion::V6).to_string(), "#EXT-X-VERSION:6" ); } #[test] fn test_parser() { assert_eq!( "#EXT-X-VERSION:6".parse().ok(), Some(ExtXVersion::new(ProtocolVersion::V6)) ); } #[test] fn test_requires_version() { assert_eq!( ExtXVersion::new(ProtocolVersion::V6).requires_version(), ProtocolVersion::V1 ); } #[test] fn test_version() { assert_eq!( ExtXVersion::new(ProtocolVersion::V6).version(), ProtocolVersion::V6 ); } }