76 lines
2.2 KiB
Rust
76 lines
2.2 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 a title case conversion.
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///
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/// In Title Case, word boundaries are indicated by spaces, and every word is
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/// capitalized.
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///
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/// ## Example:
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///
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/// ```rust
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/// use heck::ToTitleCase;
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///
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/// let sentence = "We have always lived in slums and holes in the wall.";
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/// assert_eq!(sentence.to_title_case(), "We Have Always Lived In Slums And Holes In The Wall");
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/// ```
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pub trait ToTitleCase: ToOwned {
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/// Convert this type to title case.
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fn to_title_case(&self) -> Self::Owned;
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}
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impl ToTitleCase for str {
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fn to_title_case(&self) -> String {
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AsTitleCase(self).to_string()
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}
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}
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/// This wrapper performs a title 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::AsTitleCase;
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///
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/// let sentence = "We have always lived in slums and holes in the wall.";
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/// assert_eq!(format!("{}", AsTitleCase(sentence)), "We Have Always Lived In Slums And Holes In The Wall");
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/// ```
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pub struct AsTitleCase<T: AsRef<str>>(pub T);
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impl<T: AsRef<str>> fmt::Display for AsTitleCase<T> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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transform(self.0.as_ref(), capitalize, |f| write!(f, " "), 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::ToTitleCase;
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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_title_case(), $s2)
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}
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};
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}
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t!(test1: "CamelCase" => "Camel Case");
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t!(test2: "This is Human case." => "This Is Human Case");
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t!(test3: "MixedUP CamelCase, with some Spaces" => "Mixed Up Camel Case With Some Spaces");
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t!(test4: "mixed_up_ snake_case, with some _spaces" => "Mixed Up Snake Case With Some Spaces");
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t!(test5: "kebab-case" => "Kebab Case");
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t!(test6: "SHOUTY_SNAKE_CASE" => "Shouty Snake Case");
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t!(test7: "snake_case" => "Snake Case");
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t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "This Contains All Kinds Of Word Boundaries");
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t!(test9: "XΣXΣ baffle" => "Xσxς Baffle");
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t!(test10: "XMLHttpRequest" => "Xml Http Request");
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}
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