Function regex_automata::util::interpolate::bytes
source · pub fn bytes(
replacement: &[u8],
append: impl FnMut(usize, &mut Vec<u8>),
name_to_index: impl FnMut(&str) -> Option<usize>,
dst: &mut Vec<u8>,
)
Expand description
Accepts a replacement byte string and interpolates capture references with their corresponding values.
append
should be a function that appends the byte string value of a
capture group at a particular index to the byte string given. If the
capture group index is invalid, then nothing should be appended.
name_to_index
should be a function that maps a capture group name to a
capture group index. If the given name doesn’t exist, then None
should
be returned.
Finally, dst
is where the final interpolated contents should be written.
If replacement
contains no capture group references, then dst
will be
equivalent to replacement
.
See the module documentation for details about the format supported.
§Example
use regex_automata::util::interpolate;
let mut dst = vec![];
interpolate::bytes(
b"foo $bar baz",
|index, dst| {
if index == 0 {
dst.extend_from_slice(b"BAR");
}
},
|name| {
if name == "bar" {
Some(0)
} else {
None
}
},
&mut dst,
);
assert_eq!(&b"foo BAR baz"[..], dst);