#[cfg(test)]
mod tests {
use super::*;
#[test]
fn case_recogniser() {
use Case::*;
assert_eq!(Case::compute("snakecase"), SnakeCase);
assert_eq!(Case::compute("snake_case"), SnakeCase);
assert_eq!(Case::compute("PascalCase"), PascalCase);
assert_eq!(Case::compute("camelCase"), CamelCase);
assert_eq!(Case::compute("Pascal_Snake_Case"), PascalSnakeCase);
assert_eq!(Case::compute("UPPERCASE"), UpperCase);
assert_eq!(Case::compute("SCREAMING_SNAKE_CASE"), ScreamingSnakeCase);
assert_eq!(Case::compute(""), Other);
assert_eq!(Case::compute("__"), Other);
assert_eq!(Case::compute("fake snake case"), Other);
}
}
#[derive(Debug, PartialEq, Eq)]
#[allow(clippy::enum_variant_names)]
pub enum Case {
SnakeCase,
PascalCase,
CamelCase,
PascalSnakeCase,
UpperCase,
ScreamingSnakeCase,
Other,
}
impl Case {
pub fn compute(string: &str) -> Self {
if string.is_empty() {
return Self::Other;
}
let mut contains_underscore = false;
let mut first_is_capital = false;
let mut contains_small = false;
let mut contains_capital = false;
let mut contains_non_alphanumeric = false;
let mut first_alpha = true;
for c in string.chars() {
if c == '_' {
contains_underscore = true;
} else if c.is_ascii_uppercase() {
contains_capital = true;
if first_alpha {
first_is_capital = true;
}
first_alpha = false;
} else if c.is_ascii_lowercase() {
contains_small = true;
first_alpha = false;
} else {
contains_non_alphanumeric = true;
}
}
if first_alpha || contains_non_alphanumeric {
Self::Other
} else if !contains_capital {
Self::SnakeCase
} else if !first_is_capital {
Self::CamelCase
} else if contains_small {
if contains_underscore {
Self::PascalSnakeCase
} else {
Self::PascalCase
}
} else if contains_underscore {
Self::ScreamingSnakeCase
} else {
Self::UpperCase
}
}
}
pub trait CaseProcess {
fn case(&self) -> Case;
}
impl CaseProcess for &str {
fn case(&self) -> Case {
Case::compute(self)
}
}
impl CaseProcess for String {
fn case(&self) -> Case {
Case::compute(self.as_str())
}
}