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pub fn to_pascal_case(s: &str) -> String {
// we get the first item later so this is to make it impossible for that
// to error
if s.is_empty() {
return String::new();
}
let mut result = String::new();
let mut prev_was_underscore = true; // set to true by default so the first character is capitalized
if s.chars().next().unwrap().is_numeric() {
result.push('_');
}
for c in s.chars() {
if c == '_' {
prev_was_underscore = true;
} else if prev_was_underscore {
result.push(c.to_ascii_uppercase());
prev_was_underscore = false;
} else {
result.push(c);
}
}
result
}
pub fn to_snake_case(s: &str) -> String {
let mut result = String::new();
let mut prev_was_uppercase = true;
for c in s.chars() {
if c.is_ascii_uppercase() {
if !prev_was_uppercase {
result.push('_');
}
result.push(c.to_ascii_lowercase());
prev_was_uppercase = true;
} else {
result.push(c);
prev_was_uppercase = false;
}
}
result
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_snake_case() {
assert_eq!(to_snake_case("HelloWorld"), "hello_world");
assert_eq!(to_snake_case("helloWorld"), "hello_world");
assert_eq!(to_snake_case("hello_world"), "hello_world");
}
}
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