| use std::fmt; |
| |
| use crate::{capitalize, lowercase, transform}; |
| |
| /// This trait defines a lower camel case conversion. |
| /// |
| /// In lowerCamelCase, word boundaries are indicated by capital letters, |
| /// excepting the first word. |
| /// |
| /// ## Example: |
| /// |
| /// ```rust |
| /// use heck::ToLowerCamelCase; |
| /// |
| /// let sentence = "It is we who built these palaces and cities."; |
| /// assert_eq!(sentence.to_lower_camel_case(), "itIsWeWhoBuiltThesePalacesAndCities"); |
| /// ``` |
| pub trait ToLowerCamelCase: ToOwned { |
| /// Convert this type to lower camel case. |
| fn to_lower_camel_case(&self) -> Self::Owned; |
| } |
| |
| impl ToLowerCamelCase for str { |
| fn to_lower_camel_case(&self) -> String { |
| AsLowerCamelCase(self).to_string() |
| } |
| } |
| |
| /// This wrapper performs a lower camel case conversion in [`fmt::Display`]. |
| /// |
| /// ## Example: |
| /// |
| /// ``` |
| /// use heck::AsLowerCamelCase; |
| /// |
| /// let sentence = "It is we who built these palaces and cities."; |
| /// assert_eq!(format!("{}", AsLowerCamelCase(sentence)), "itIsWeWhoBuiltThesePalacesAndCities"); |
| /// ``` |
| pub struct AsLowerCamelCase<T: AsRef<str>>(pub T); |
| |
| impl<T: AsRef<str>> fmt::Display for AsLowerCamelCase<T> { |
| fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { |
| let mut first = true; |
| transform( |
| self.0.as_ref(), |
| |s, f| { |
| if first { |
| first = false; |
| lowercase(s, f) |
| } else { |
| capitalize(s, f) |
| } |
| }, |
| |_| Ok(()), |
| f, |
| ) |
| } |
| } |
| |
| #[cfg(test)] |
| mod tests { |
| use super::ToLowerCamelCase; |
| |
| macro_rules! t { |
| ($t:ident : $s1:expr => $s2:expr) => { |
| #[test] |
| fn $t() { |
| assert_eq!($s1.to_lower_camel_case(), $s2) |
| } |
| }; |
| } |
| |
| t!(test1: "CamelCase" => "camelCase"); |
| t!(test2: "This is Human case." => "thisIsHumanCase"); |
| t!(test3: "MixedUP CamelCase, with some Spaces" => "mixedUpCamelCaseWithSomeSpaces"); |
| t!(test4: "mixed_up_ snake_case, with some _spaces" => "mixedUpSnakeCaseWithSomeSpaces"); |
| t!(test5: "kebab-case" => "kebabCase"); |
| t!(test6: "SHOUTY_SNAKE_CASE" => "shoutySnakeCase"); |
| t!(test7: "snake_case" => "snakeCase"); |
| t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "thisContainsAllKindsOfWordBoundaries"); |
| #[cfg(feature = "unicode")] |
| t!(test9: "XΣXΣ baffle" => "xσxςBaffle"); |
| t!(test10: "XMLHttpRequest" => "xmlHttpRequest"); |
| // TODO unicode tests |
| } |