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use std::borrow::Cow;
use nom::{
error::{make_error, ErrorKind},
Err, IResult,
};
use crate::parse::combinators::{blank_lines_count, lines_while};
#[derive(Debug, Default, Clone)]
#[cfg_attr(test, derive(PartialEq))]
#[cfg_attr(feature = "ser", derive(serde::Serialize))]
pub struct FixedWidth<'a> {
pub value: Cow<'a, str>,
pub post_blank: usize,
}
impl FixedWidth<'_> {
pub(crate) fn parse(input: &str) -> Option<(&str, FixedWidth)> {
parse_internal(input).ok()
}
pub fn into_owned(self) -> FixedWidth<'static> {
FixedWidth {
value: self.value.into_owned().into(),
post_blank: self.post_blank,
}
}
}
fn parse_internal(input: &str) -> IResult<&str, FixedWidth, ()> {
let (input, value) = lines_while(|line| {
let line = line.trim_start();
line == ":" || line.starts_with(": ")
})(input)?;
if value.is_empty() {
return Err(Err::Error(make_error(input, ErrorKind::Many0)));
}
let (input, post_blank) = blank_lines_count(input)?;
Ok((
input,
FixedWidth {
value: value.into(),
post_blank,
},
))
}
#[test]
fn parse() {
assert_eq!(
FixedWidth::parse(
r#": A
:
: B
: C
"#
),
Some((
"",
FixedWidth {
value: r#": A
:
: B
: C
"#
.into(),
post_blank: 1
}
))
);
}