oni_comb_parser/text/
identifier.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 Identifier;
8
9pub fn identifier() -> Identifier {
10  Identifier
11}
12
13impl<'a> Parser<StrInput<'a>> for Identifier {
14  type Error = ParseError;
15  type Output = &'a str;
16
17  #[inline]
18  fn parse_next(&mut self, input: &mut StrInput<'a>) -> PResult<&'a str, ParseError> {
19    let pos = input.offset();
20    let remaining = input.as_str();
21    let mut chars = remaining.chars();
22
23    match chars.next() {
24      Some(c) if c.is_ascii_alphabetic() || c == '_' => {}
25      _ => {
26        return Err(Fail::Backtrack(ParseError::expected_description(pos, "identifier")));
27      }
28    }
29
30    let mut consumed = remaining.chars().next().unwrap().len_utf8();
31    for c in chars {
32      if c.is_ascii_alphanumeric() || c == '_' {
33        consumed += c.len_utf8();
34      } else {
35        break;
36      }
37    }
38
39    input.advance(consumed);
40    Ok(&remaining[..consumed])
41  }
42}
oni_comb_parser/text/identifier.rs

oni_comb_parser/text/
identifier.rs
