Comments (3)
Hello @frenetisch-applaudierend.
I think the fifth chapter of the article The Nom Guide (Nominomicon) be able to address your question.
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Hi @coalooball
Thanks for the Link, I haven't seen that one before!
However I don't think it applies to my use case, since the mentioned parsers all only allow a predicate on single characters. I would need predicate on different parsers (i.e. take_until(tag("<#").or(tag("(*")))
), but this does not seem handled (or I did not see it).
from nom.
Hi @coalooball
Thanks for the Link, I haven't seen that one before!
However I don't think it applies to my use case, since the mentioned parsers all only allow a predicate on single characters. I would need predicate on different parsers (i.e.
take_until(tag("<#").or(tag("(*")))
), but this does not seem handled (or I did not see it).
Hello again!
The take_until
really doesn't work that way, since it's the equivalent of a terminal node in BNF. I suppose you could use terminated
to extract arbitrary text.
Here is my method which is a bit more cumbersome, I don't know if there are any other concise methods:
use nom::{
branch::alt,
bytes::complete::{tag, take_till, take_while1},
character::{is_alphanumeric, is_space},
sequence::{delimited, terminated},
IResult,
};
fn is_delimiter(s: u8) -> bool {
s == 0x2a || s == 0x23
}
fn embedded_sequence(s: &[u8]) -> IResult<&[u8], &[u8]> {
delimited(
alt((tag(b"<"), tag(b"("))),
delimited(
alt((tag(b"#"), tag(b"*"))),
take_till(is_delimiter),
alt((tag(b"#"), tag(b"*"))),
),
alt((tag(b">"), tag(b")"))),
)(s)
}
fn parse(s: &[u8]) -> IResult<&[u8], &[u8]> {
terminated(
take_while1(|x| is_alphanumeric(x) || is_space(x)),
embedded_sequence,
)(s)
}
fn main() {}
#[test]
fn test_embedded_sequence() {
assert_eq!(
embedded_sequence(b"<#embedded sequence 1#>111").unwrap(),
(b"111".as_ref(), b"embedded sequence 1".as_ref())
);
assert_eq!(
parse(b"Test <#embedded sequence 1#> and (*embedded sequence 2*)").unwrap(),
(b" and (*embedded sequence 2*)".as_ref(), b"Test ".as_ref())
)
}
from nom.
Related Issues (20)
- alt short circuits with Incomplete return HOT 3
- unsigned integer underflow HOT 3
- using `.clone()` on a double reference HOT 1
- Nom's error is referencing data owned by the calling function
- Any other approach to handle left recursion
- Mention difference between is_not and take_until in their respective docs.
- I was going to complain about an issue in the function take_while_m_n, but [update : and I will do] ...
- Add u48 number parser HOT 1
- I want to implement `separated_tuple` for 8.0 HOT 7
- `tag_no_case` panicks while matching certain unicode capitalized characters.
- Ergonomics of `alt()` taking tuple versus slice HOT 3
- A new release for 8.0?
- FromStr-esque parsing trait HOT 1
- Float parsing with trailing `e` broken
- A fix has to be implemented by those dependencies HOT 7
- FlatMap does not properly implement Parser HOT 2
- Feature Request: Add branching parser combinator for `exclude()` and `depend()` HOT 1
- Document (or fix?) the fact that escaped() succeeds on empty inputs HOT 7
- Stack overflow before parsing HOT 1
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