udled_tokenizers/
bool.rs

1use udled::{
2    tokenizers::or, AsBytes, AsChar, Buffer, Error, Item, Reader, Tokenizer, TokenizerExt,
3};
4
5/// Match 'true' or 'false'
6#[derive(Debug, Clone, Copy, Default)]
7pub struct Bool;
8
9impl<'input, B> Tokenizer<'input, B> for Bool
10where
11    B: Buffer<'input>,
12    B::Item: AsChar,
13    B::Source: AsBytes<'input>,
14{
15    type Token = Item<bool>;
16
17    fn to_token<'a>(&self, reader: &mut Reader<'_, 'input, B>) -> Result<Self::Token, Error> {
18        let item = reader
19            .parse(or(
20                "true".map_ok(|m| m.map(|_| true)),
21                "false".map_ok(|m| m.map(|_| false)),
22            ))?
23            .unify();
24
25        Ok(item)
26    }
27
28    fn eat(&self, reader: &mut Reader<'_, 'input, B>) -> Result<(), Error> {
29        reader.eat(or("true", "false"))
30    }
31
32    fn peek<'a>(&self, reader: &mut Reader<'_, 'input, B>) -> bool {
33        reader.is(or("true", "false"))
34    }
35}
36
37#[cfg(test)]
38mod test {
39    use udled::{Input, EOF};
40
41    use super::Bool;
42
43    #[test]
44    fn bool() {
45        let mut input = Input::new("true false");
46
47        let (a, _, b) = input.parse((Bool, ' ', Bool)).unwrap();
48
49        assert_eq!(a.value, true);
50        assert_eq!(b.value, false);
51        assert!(input.is(EOF))
52    }
53}
udled_tokenizers/bool.rs

udled_tokenizers/
bool.rs
