pub fn to_pascal_case(s: &str) -> String {
let mut result = String::new();
let mut capitalize_next = true;
for c in s.chars() {
if c == '_' {
capitalize_next = true;
} else if capitalize_next {
result.push(c.to_ascii_uppercase());
capitalize_next = false;
} else {
result.push(c);
}
}
result
}
pub fn to_snake_case(s: &str) -> String {
let mut result = String::new();
for (i, c) in s.chars().enumerate() {
if c.is_uppercase() {
if i > 0 {
result.push('_');
}
result.push(c.to_ascii_lowercase());
} else {
result.push(c);
}
}
result
}
pub fn to_screaming_snake_case(s: &str) -> String {
let bytes = s.as_bytes();
let mut result = String::with_capacity(s.len() + 4);
for (i, &b) in bytes.iter().enumerate() {
if b.is_ascii_uppercase() && i > 0 && bytes[i - 1].is_ascii_lowercase() {
result.push('_');
}
result.push(b.to_ascii_uppercase() as char);
}
result
}
pub fn is_snake_case(s: &str) -> bool {
if s.is_empty() {
return true;
}
let s = s.strip_prefix('_').unwrap_or(s);
s.chars()
.all(|c| c.is_lowercase() || c.is_ascii_digit() || c == '_')
}
pub fn is_screaming_snake_case(s: &str) -> bool {
if s.is_empty() {
return true;
}
let s = s.strip_prefix('_').unwrap_or(s);
s.chars()
.all(|c| c.is_uppercase() || c.is_ascii_digit() || c == '_')
}