use std::borrow::Cow;
use nom::{
bytes::complete::{tag, take, take_until, take_while1},
sequence::{delimited, separated_pair},
IResult,
};
#[cfg_attr(test, derive(PartialEq))]
#[cfg_attr(feature = "ser", derive(serde::Serialize))]
#[derive(Debug, Clone)]
pub struct Snippet<'a> {
pub name: Cow<'a, str>,
pub value: Cow<'a, str>,
}
impl Snippet<'_> {
pub(crate) fn parse(input: &str) -> Option<(&str, Snippet)> {
parse_internal(input).ok()
}
pub fn into_owned(self) -> Snippet<'static> {
Snippet {
name: self.name.into_owned().into(),
value: self.value.into_owned().into(),
}
}
}
#[inline]
fn parse_internal(input: &str) -> IResult<&str, Snippet, ()> {
let (input, (name, value)) = delimited(
tag("@@"),
separated_pair(
take_while1(|c: char| c.is_ascii_alphanumeric() || c == '-'),
tag(":"),
take_until("@@"),
),
take(2usize),
)(input)?;
Ok((
input,
Snippet {
name: name.into(),
value: value.into(),
},
))
}
#[test]
fn parse() {
assert_eq!(
Snippet::parse("@@html:<b>@@"),
Some((
"",
Snippet {
name: "html".into(),
value: "<b>".into()
}
))
);
assert_eq!(
Snippet::parse("@@latex:any arbitrary LaTeX code@@"),
Some((
"",
Snippet {
name: "latex".into(),
value: "any arbitrary LaTeX code".into(),
}
))
);
assert_eq!(
Snippet::parse("@@html:@@"),
Some((
"",
Snippet {
name: "html".into(),
value: "".into(),
}
))
);
assert_eq!(
Snippet::parse("@@html:<p>@</p>@@"),
Some((
"",
Snippet {
name: "html".into(),
value: "<p>@</p>".into(),
}
))
);
assert!(Snippet::parse("@@html:<b>@").is_none());
assert!(Snippet::parse("@@html<b>@@").is_none());
assert!(Snippet::parse("@@:<b>@@").is_none());
}