57 lines
2 KiB
Rust
57 lines
2 KiB
Rust
use nom::{bytes::complete::take_while_m_n, error::ParseError, IResult};
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use crate::parsers::{blank_lines, eol};
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#[derive(Debug, Default)]
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#[cfg_attr(test, derive(PartialEq))]
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#[cfg_attr(feature = "ser", derive(serde::Serialize))]
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pub struct Rule {
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/// Numbers of blank lines between rule line and next non-blank line or
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/// buffer's end
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pub post_blank: usize,
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}
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impl Rule {
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pub(crate) fn parse(input: &str) -> Option<(&str, Rule)> {
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parse_rule::<()>(input).ok()
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}
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}
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fn parse_rule<'a, E: ParseError<&'a str>>(input: &'a str) -> IResult<&str, Rule, E> {
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let (input, _) = take_while_m_n(5, usize::max_value(), |c| c == '-')(input)?;
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let (input, _) = eol(input)?;
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let (input, blank) = blank_lines(input);
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Ok((input, Rule { post_blank: blank }))
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}
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#[test]
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fn parse() {
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use nom::error::VerboseError;
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assert_eq!(
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parse_rule::<VerboseError<&str>>("-----"),
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Ok(("", Rule { post_blank: 0 }))
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);
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assert_eq!(
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parse_rule::<VerboseError<&str>>("--------"),
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Ok(("", Rule { post_blank: 0 }))
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);
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assert_eq!(
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parse_rule::<VerboseError<&str>>("-----\n\n\n"),
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Ok(("", Rule { post_blank: 2 }))
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);
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assert_eq!(
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parse_rule::<VerboseError<&str>>("----- \n"),
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Ok(("", Rule { post_blank: 0 }))
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);
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assert!(parse_rule::<VerboseError<&str>>("").is_err());
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assert!(parse_rule::<VerboseError<&str>>("----").is_err());
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assert!(parse_rule::<VerboseError<&str>>("----").is_err());
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assert!(parse_rule::<VerboseError<&str>>("None----").is_err());
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assert!(parse_rule::<VerboseError<&str>>("None ----").is_err());
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assert!(parse_rule::<VerboseError<&str>>("None------").is_err());
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assert!(parse_rule::<VerboseError<&str>>("----None----").is_err());
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assert!(parse_rule::<VerboseError<&str>>("\t\t----").is_err());
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assert!(parse_rule::<VerboseError<&str>>("------None").is_err());
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assert!(parse_rule::<VerboseError<&str>>("----- None").is_err());
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}
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