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use crate::body::Body;
use crate::Fragment;
use std::convert::TryFrom;
use thiserror::Error;
#[derive(Debug, PartialEq, Clone, Eq, Hash)]
pub struct Trailer {
key: String,
value: String,
}
impl Trailer {
#[must_use]
pub fn new(key: &str, value: &str) -> Trailer {
Trailer {
key: String::from(key),
value: String::from(value),
}
}
#[must_use]
pub fn get_key(&self) -> String {
self.key.clone()
}
#[must_use]
pub fn get_value(&self) -> String {
self.value.clone()
}
}
impl From<Trailer> for String {
fn from(trailer: Trailer) -> Self {
format!("{}: {}", trailer.key, trailer.value)
}
}
impl From<Trailer> for Fragment {
fn from(trailer: Trailer) -> Self {
let trailer: String = trailer.into();
Fragment::Body(Body::from(trailer))
}
}
impl TryFrom<Body> for Trailer {
type Error = Error;
fn try_from(body: Body) -> Result<Self, Self::Error> {
let body_value = String::from(body.clone());
let value_and_key: Vec<&str> = body_value.split(": ").collect();
let key = value_and_key
.get(0)
.ok_or_else(|| Error::NotATrailer(body.clone()))?;
let value = value_and_key.get(1).ok_or(Error::NotATrailer(body))?;
Ok(Trailer::new(key, value))
}
}
#[derive(Error, Debug)]
pub enum Error {
#[error("no colon in body line, {0} is not a trailer")]
NotATrailer(Body),
}
#[cfg(test)]
mod tests {
use super::Trailer;
use crate::body::Body;
use crate::Fragment;
use pretty_assertions::assert_eq;
use std::convert::TryFrom;
#[test]
fn it_can_tell_me_its_key() {
let trailer = Trailer::new("Relates-to", "#128");
assert_eq!(trailer.get_key(), String::from("Relates-to"))
}
#[test]
fn it_can_tell_me_its_value() {
let trailer = Trailer::new("Relates-to", "#128");
assert_eq!(trailer.get_value(), String::from("#128"))
}
#[test]
fn it_can_give_me_itself_as_a_string() {
let trailer = Trailer::new("Relates-to", "#128");
assert_eq!(String::from(trailer), String::from("Relates-to: #128"))
}
#[test]
fn can_generate_itself_from_body() {
let trailer = Trailer::try_from(Body::from("Relates-to: #128"));
assert_eq!(
String::from(trailer.expect("Could not parse from string")),
String::from("Relates-to: #128")
)
}
#[test]
fn can_generate_from_body() {
let trailer = Trailer::new("Relates-to", "#128");
let body: Fragment = Fragment::from(trailer);
assert_eq!(body, Fragment::Body(Body::from("Relates-to: #128")))
}
}