89 lines
2.5 KiB
Rust
89 lines
2.5 KiB
Rust
use core::fmt;
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use alloc::{
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borrow::ToOwned,
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string::{String, ToString},
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};
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use crate::{capitalize, transform};
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/// This trait defines an upper camel case conversion.
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///
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/// In UpperCamelCase, word boundaries are indicated by capital letters,
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/// including the first word.
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///
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/// ## Example:
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///
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/// ```rust
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/// use heck::ToUpperCamelCase;
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///
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/// let sentence = "We are not in the least afraid of ruins.";
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/// assert_eq!(sentence.to_upper_camel_case(), "WeAreNotInTheLeastAfraidOfRuins");
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/// ```
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pub trait ToUpperCamelCase: ToOwned {
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/// Convert this type to upper camel case.
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fn to_upper_camel_case(&self) -> Self::Owned;
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}
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impl ToUpperCamelCase for str {
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fn to_upper_camel_case(&self) -> String {
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AsUpperCamelCase(self).to_string()
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}
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}
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/// `ToPascalCase` is an alias for [`ToUpperCamelCase`]. See ToUpperCamelCase for more
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/// documentation.
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pub trait ToPascalCase: ToOwned {
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/// Convert this type to upper camel case.
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fn to_pascal_case(&self) -> Self::Owned;
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}
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impl<T: ?Sized + ToUpperCamelCase> ToPascalCase for T {
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fn to_pascal_case(&self) -> Self::Owned {
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self.to_upper_camel_case()
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}
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}
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/// This wrapper performs a upper camel case conversion in [`fmt::Display`].
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///
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/// ## Example:
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///
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/// ```
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/// use heck::AsUpperCamelCase;
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///
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/// let sentence = "We are not in the least afraid of ruins.";
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/// assert_eq!(format!("{}", AsUpperCamelCase(sentence)), "WeAreNotInTheLeastAfraidOfRuins");
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/// ```
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pub struct AsUpperCamelCase<T: AsRef<str>>(pub T);
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impl<T: AsRef<str>> fmt::Display for AsUpperCamelCase<T> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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transform(self.0.as_ref(), capitalize, |_| Ok(()), f)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::ToUpperCamelCase;
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macro_rules! t {
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($t:ident : $s1:expr => $s2:expr) => {
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#[test]
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fn $t() {
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assert_eq!($s1.to_upper_camel_case(), $s2)
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}
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};
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}
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t!(test1: "CamelCase" => "CamelCase");
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t!(test2: "This is Human case." => "ThisIsHumanCase");
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t!(test3: "MixedUP_CamelCase, with some Spaces" => "MixedUpCamelCaseWithSomeSpaces");
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t!(test4: "mixed_up_ snake_case, with some _spaces" => "MixedUpSnakeCaseWithSomeSpaces");
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t!(test5: "kebab-case" => "KebabCase");
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t!(test6: "SHOUTY_SNAKE_CASE" => "ShoutySnakeCase");
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t!(test7: "snake_case" => "SnakeCase");
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t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "ThisContainsAllKindsOfWordBoundaries");
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t!(test9: "XΣXΣ baffle" => "XσxςBaffle");
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t!(test10: "XMLHttpRequest" => "XmlHttpRequest");
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}
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