hls_m3u8/src/tags/basic/version.rs

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 FromStr for ExtXVersion {
    type Err = Error;

    fn from_str(input: &str) -> Result<Self, Self::Err> {
        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
        );
    }
}