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-rw-r--r--crates/stdx/src/lib.rs18
1 files changed, 15 insertions, 3 deletions
diff --git a/crates/stdx/src/lib.rs b/crates/stdx/src/lib.rs
index 011935cad..59d89f47d 100644
--- a/crates/stdx/src/lib.rs
+++ b/crates/stdx/src/lib.rs
@@ -28,20 +28,32 @@ pub fn timeit(label: &'static str) -> impl Drop {
28 Guard { label, start: Instant::now() } 28 Guard { label, start: Instant::now() }
29} 29}
30 30
31pub fn to_lower_snake_case(s: &str) -> String { 31fn to_snake_case<F: Fn(&char) -> char>(s: &str, change_case: F) -> String {
32 let mut buf = String::with_capacity(s.len()); 32 let mut buf = String::with_capacity(s.len());
33 let mut prev = false; 33 let mut prev = false;
34 for c in s.chars() { 34 for c in s.chars() {
35 // `&& prev` is required to not insert `_` before the first symbol.
35 if c.is_ascii_uppercase() && prev { 36 if c.is_ascii_uppercase() && prev {
36 buf.push('_') 37 // This check is required to not translate `Weird_Case` into `weird__case`.
38 if !buf.ends_with('_') {
39 buf.push('_')
40 }
37 } 41 }
38 prev = true; 42 prev = true;
39 43
40 buf.push(c.to_ascii_lowercase()); 44 buf.push(change_case(&c));
41 } 45 }
42 buf 46 buf
43} 47}
44 48
49pub fn to_lower_snake_case(s: &str) -> String {
50 to_snake_case(s, char::to_ascii_lowercase)
51}
52
53pub fn to_upper_snake_case(s: &str) -> String {
54 to_snake_case(s, char::to_ascii_uppercase)
55}
56
45pub fn replace(buf: &mut String, from: char, to: &str) { 57pub fn replace(buf: &mut String, from: char, to: &str) {
46 if !buf.contains(from) { 58 if !buf.contains(from) {
47 return; 59 return;