Macro esp_idf_svc::hal::sys::const_format::str_replace
source · macro_rules! str_replace { ($input:expr, $pattern:expr, $replace_with:expr $(,)*) => { ... }; }
Expand description
Replaces all the instances of $pattern
in $input
(a &'static str
constant) with $replace_with
(a &'static str
constant).
§Signature
This macro acts like a function of this signature:
fn str_replace(
input: &'static str,
pattern: impl Pattern,
replace_with: &'static str,
) -> &'static str
and is evaluated at compile-time.
Where pattern
can be any of these types:
-
&'static str
-
char
-
u8
: required to be ascii (0
up to127
inclusive).
§Example
use const_format::str_replace;
// Passing a string pattern
assert_eq!(
str_replace!("The incredible shrinking man.", "i", "eee"),
"The eeencredeeeble shreeenkeeeng man.",
);
// Passing a char pattern
assert_eq!(
str_replace!("The incredible shrinking man.", ' ', "---"),
"The---incredible---shrinking---man.",
);
// Passing an ascii u8 pattern.
assert_eq!(
str_replace!("The incredible shrinking man.", b'i', "eee"),
"The eeencredeeeble shreeenkeeeng man.",
);
// Removing all instances of the pattern
assert_eq!(
str_replace!("remove haire", "re", ""),
"move hai",
);
// This shows that all the arguments can be `const`s, they don't have to be literals.
{
const IN: &str = "Foo Boo Patoo";
const REPLACING: &str = "oo";
const REPLACE_WITH: &str = "uh";
assert_eq!(str_replace!(IN, REPLACING, REPLACE_WITH), "Fuh Buh Patuh");
}