49 lines
1.7 KiB
Rust
49 lines
1.7 KiB
Rust
use std::usize;
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use nom::{bytes::complete::take_while_m_n, error::ParseError, IResult};
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use crate::parsers::eol;
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pub fn parse_rule(input: &str) -> Option<&str> {
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parse_rule_internal::<()>(input)
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.ok()
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.map(|(input, _)| input)
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}
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fn parse_rule_internal<'a, E: ParseError<&'a str>>(input: &'a str) -> IResult<&str, (), E> {
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let (input, _) = take_while_m_n(5, usize::MAX, |c| c == '-')(input)?;
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let (input, _) = eol(input)?;
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Ok((input, ()))
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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_internal::<VerboseError<&str>>("-----"),
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Ok(("", ()))
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);
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assert_eq!(
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parse_rule_internal::<VerboseError<&str>>("--------"),
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Ok(("", ()))
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);
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assert_eq!(
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parse_rule_internal::<VerboseError<&str>>("-----\n"),
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Ok(("", ()))
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);
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assert_eq!(
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parse_rule_internal::<VerboseError<&str>>("----- \n"),
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Ok(("", ()))
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);
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assert!(parse_rule_internal::<VerboseError<&str>>("").is_err());
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assert!(parse_rule_internal::<VerboseError<&str>>("----").is_err());
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assert!(parse_rule_internal::<VerboseError<&str>>("----").is_err());
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assert!(parse_rule_internal::<VerboseError<&str>>("None----").is_err());
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assert!(parse_rule_internal::<VerboseError<&str>>("None ----").is_err());
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assert!(parse_rule_internal::<VerboseError<&str>>("None------").is_err());
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assert!(parse_rule_internal::<VerboseError<&str>>("----None----").is_err());
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assert!(parse_rule_internal::<VerboseError<&str>>("\t\t----").is_err());
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assert!(parse_rule_internal::<VerboseError<&str>>("------None").is_err());
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assert!(parse_rule_internal::<VerboseError<&str>>("----- None").is_err());
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}
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