oni_comb_parser/text/
char.rs

1use crate::error::ParseError;
2use crate::fail::{Fail, PResult};
3use crate::input::Input;
4use crate::parser::Parser;
5use crate::str_input::StrInput;
6
7pub struct Char(char);
8
9pub fn char(c: char) -> Char {
10  Char(c)
11}
12
13impl Parser<StrInput<'_>> for Char {
14  type Error = ParseError;
15  type Output = char;
16
17  #[inline]
18  fn parse_next(&mut self, input: &mut StrInput<'_>) -> PResult<Self::Output, Self::Error> {
19    let pos = input.offset();
20    let remaining = input.remaining();
21    match remaining.chars().next() {
22      Some(c) if c == self.0 => {
23        input.advance(c.len_utf8());
24        Ok(c)
25      }
26      _ => Err(Fail::Backtrack(ParseError::expected_char(pos, self.0))),
27    }
28  }
29}

oni_comb_parser/text/char.rs

oni_comb_parser/text/
char.rs