mirror of
https://github.com/sile/hls_m3u8.git
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126 lines
3.4 KiB
Rust
126 lines
3.4 KiB
Rust
use std::borrow::Cow;
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use std::convert::TryFrom;
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use std::fmt;
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use crate::types::Float;
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use crate::utils::{quote, unquote};
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use crate::Error;
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/// A `Value`.
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#[non_exhaustive]
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#[derive(Debug, Clone, PartialEq, PartialOrd, Eq, Ord, Hash)]
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pub enum Value<'a> {
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/// A `String`.
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String(Cow<'a, str>),
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/// A sequence of bytes.
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Hex(Vec<u8>),
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/// A floating point number, that's neither NaN nor infinite.
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Float(Float),
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}
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impl<'a> Value<'a> {
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/// Makes the struct independent of its lifetime, by taking ownership of all
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/// internal [`Cow`]s.
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///
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/// # Note
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///
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/// This is a relatively expensive operation.
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#[must_use]
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pub fn into_owned(self) -> Value<'static> {
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match self {
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Self::String(value) => Value::String(Cow::Owned(value.into_owned())),
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Self::Hex(value) => Value::Hex(value),
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Self::Float(value) => Value::Float(value),
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}
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}
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}
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impl<'a> fmt::Display for Value<'a> {
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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match &self {
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Self::String(value) => write!(f, "{}", quote(value)),
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Self::Hex(value) => write!(f, "0x{}", hex::encode_upper(value)),
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Self::Float(value) => write!(f, "{}", value),
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}
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}
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}
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impl<'a> TryFrom<&'a str> for Value<'a> {
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type Error = Error;
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fn try_from(input: &'a str) -> Result<Self, Self::Error> {
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if input.starts_with("0x") || input.starts_with("0X") {
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Ok(Self::Hex(
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hex::decode(input.trim_start_matches("0x").trim_start_matches("0X"))
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.map_err(Error::hex)?,
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))
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} else {
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match input.parse() {
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Ok(value) => Ok(Self::Float(value)),
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Err(_) => Ok(Self::String(unquote(input))),
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}
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}
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}
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}
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impl<T: Into<Float>> From<T> for Value<'static> {
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fn from(value: T) -> Self { Self::Float(value.into()) }
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}
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impl From<Vec<u8>> for Value<'static> {
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fn from(value: Vec<u8>) -> Self { Self::Hex(value) }
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}
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impl From<String> for Value<'static> {
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fn from(value: String) -> Self { Self::String(Cow::Owned(unquote(&value).into_owned())) }
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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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#[test]
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fn test_display() {
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assert_eq!(Value::Float(Float::new(1.1)).to_string(), "1.1".to_string());
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assert_eq!(
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Value::String("&str".into()).to_string(),
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"\"&str\"".to_string()
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);
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assert_eq!(
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Value::Hex(vec![1, 2, 3]).to_string(),
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"0x010203".to_string()
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);
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}
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#[test]
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fn test_parser() {
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assert_eq!(
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Value::Float(Float::new(1.1)),
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Value::try_from("1.1").unwrap()
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);
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assert_eq!(
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Value::String("&str".into()),
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Value::try_from("\"&str\"").unwrap()
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);
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assert_eq!(
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Value::Hex(vec![1, 2, 3]),
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Value::try_from("0x010203").unwrap()
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);
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assert_eq!(
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Value::Hex(vec![1, 2, 3]),
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Value::try_from("0X010203").unwrap()
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);
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assert!(Value::try_from("0x010203Z").is_err());
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}
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#[test]
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fn test_from() {
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assert_eq!(Value::from(1_u8), Value::Float(Float::new(1.0)));
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assert_eq!(
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Value::from("&str".to_string()),
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Value::String("&str".into())
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);
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assert_eq!(Value::from(vec![1, 2, 3]), Value::Hex(vec![1, 2, 3]));
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}
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}
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