Crate nom_locate
source ·Expand description
nom_locate, a special input type to locate tokens
The source code is available on Github
Features
This crate exposes two cargo feature flags, generic-simd
and runtime-dispatch-simd
.
These correspond to the features exposed by bytecount.
How to use it
The explanations are given in the README of the Github repository. You may also consult the FAQ.
use nom::bytes::complete::{tag, take_until};
use nom::IResult;
use nom_locate::{position, LocatedSpan};
type Span<'a> = LocatedSpan<&'a str>;
struct Token<'a> {
pub position: Span<'a>,
pub foo: &'a str,
pub bar: &'a str,
}
fn parse_foobar(s: Span) -> IResult<Span, Token> {
let (s, _) = take_until("foo")(s)?;
let (s, pos) = position(s)?;
let (s, foo) = tag("foo")(s)?;
let (s, bar) = tag("bar")(s)?;
Ok((
s,
Token {
position: pos,
foo: foo.fragment(),
bar: bar.fragment(),
},
))
}
fn main () {
let input = Span::new("Lorem ipsum \n foobar");
let output = parse_foobar(input);
let position = output.unwrap().1.position;
assert_eq!(position.location_offset(), 14);
assert_eq!(position.location_line(), 2);
assert_eq!(position.fragment(), &"");
assert_eq!(position.get_column(), 2);
}
Extra information
You can also add arbitrary extra information using the extra property of LocatedSpan
.
This property is not used when comparing two LocatedSpan
s.
ⓘ
use nom_locate::LocatedSpan;
type Span<'a> = LocatedSpan<&'a str, String>;
let input = Span::new_extra("Lorem ipsum \n foobar", "filename");
let output = parse_foobar(input);
let extra = output.unwrap().1.extra;
Macros
- impl_compareDeprecated
- impl_extend_intoDeprecated
- impl_hex_displayDeprecated
- impl_input_iterDeprecated
- impl_slice_rangeDeprecated
- impl_slice_rangesDeprecated
- Capture the position of the current fragment
Structs
- A LocatedSpan is a set of meta information about the location of a token, including extra information.
Functions
- Capture the position of the current fragment