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use std::borrow::Cow;
use nom::{
bytes::complete::{tag, take_while1},
character::complete::space0,
sequence::delimited,
IResult,
};
use crate::parse::combinators::{blank_lines_count, eol, lines_till};
#[derive(Debug, Default, Clone)]
#[cfg_attr(test, derive(PartialEq))]
#[cfg_attr(feature = "ser", derive(serde::Serialize))]
pub struct Drawer<'a> {
pub name: Cow<'a, str>,
pub pre_blank: usize,
pub post_blank: usize,
}
impl Drawer<'_> {
pub(crate) fn parse(input: &str) -> Option<(&str, (Drawer, &str))> {
parse_drawer(input).ok()
}
pub fn into_owned(self) -> Drawer<'static> {
Drawer {
name: self.name.into_owned().into(),
pre_blank: self.pre_blank,
post_blank: self.post_blank,
}
}
}
#[inline]
pub fn parse_drawer(input: &str) -> IResult<&str, (Drawer, &str), ()> {
let (input, (mut drawer, content)) = parse_drawer_without_blank(input)?;
let (content, blank) = blank_lines_count(content)?;
drawer.pre_blank = blank;
let (input, blank) = blank_lines_count(input)?;
drawer.post_blank = blank;
Ok((input, (drawer, content)))
}
pub fn parse_drawer_without_blank(input: &str) -> IResult<&str, (Drawer, &str), ()> {
let (input, _) = space0(input)?;
let (input, name) = delimited(
tag(":"),
take_while1(|c: char| c.is_ascii_alphabetic() || c == '-' || c == '_'),
tag(":"),
)(input)?;
let (input, _) = eol(input)?;
let (input, contents) = lines_till(|line| line.trim().eq_ignore_ascii_case(":END:"))(input)?;
Ok((
input,
(
Drawer {
name: name.into(),
pre_blank: 0,
post_blank: 0,
},
contents,
),
))
}
#[test]
fn parse() {
assert_eq!(
parse_drawer(
r#":PROPERTIES:
:CUSTOM_ID: id
:END:"#
),
Ok((
"",
(
Drawer {
name: "PROPERTIES".into(),
pre_blank: 0,
post_blank: 0
},
" :CUSTOM_ID: id\n"
)
))
);
assert_eq!(
parse_drawer(
r#":PROPERTIES:
:END:
"#
),
Ok((
"",
(
Drawer {
name: "PROPERTIES".into(),
pre_blank: 2,
post_blank: 1,
},
""
)
))
);
assert!(parse_drawer(":SPAGHETTI:\n").is_err());
}