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-rw-r--r--third_party/rust/heck/src/title.rs71
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diff --git a/third_party/rust/heck/src/title.rs b/third_party/rust/heck/src/title.rs
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+use std::fmt;
+
+use crate::{capitalize, transform};
+
+/// This trait defines a title case conversion.
+///
+/// In Title Case, word boundaries are indicated by spaces, and every word is
+/// capitalized.
+///
+/// ## Example:
+///
+/// ```rust
+/// use heck::ToTitleCase;
+///
+/// let sentence = "We have always lived in slums and holes in the wall.";
+/// assert_eq!(sentence.to_title_case(), "We Have Always Lived In Slums And Holes In The Wall");
+/// ```
+pub trait ToTitleCase: ToOwned {
+ /// Convert this type to title case.
+ fn to_title_case(&self) -> Self::Owned;
+}
+
+impl ToTitleCase for str {
+ fn to_title_case(&self) -> String {
+ AsTitleCase(self).to_string()
+ }
+}
+
+/// This wrapper performs a title case conversion in [`fmt::Display`].
+///
+/// ## Example:
+///
+/// ```
+/// use heck::AsTitleCase;
+///
+/// let sentence = "We have always lived in slums and holes in the wall.";
+/// assert_eq!(format!("{}", AsTitleCase(sentence)), "We Have Always Lived In Slums And Holes In The Wall");
+/// ```
+pub struct AsTitleCase<T: AsRef<str>>(pub T);
+
+impl<T: AsRef<str>> fmt::Display for AsTitleCase<T> {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ transform(self.0.as_ref(), capitalize, |f| write!(f, " "), f)
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use super::ToTitleCase;
+
+ macro_rules! t {
+ ($t:ident : $s1:expr => $s2:expr) => {
+ #[test]
+ fn $t() {
+ assert_eq!($s1.to_title_case(), $s2)
+ }
+ };
+ }
+
+ t!(test1: "CamelCase" => "Camel Case");
+ t!(test2: "This is Human case." => "This Is Human Case");
+ t!(test3: "MixedUP CamelCase, with some Spaces" => "Mixed Up Camel Case With Some Spaces");
+ t!(test4: "mixed_up_ snake_case, with some _spaces" => "Mixed Up Snake Case With Some Spaces");
+ t!(test5: "kebab-case" => "Kebab Case");
+ t!(test6: "SHOUTY_SNAKE_CASE" => "Shouty Snake Case");
+ t!(test7: "snake_case" => "Snake Case");
+ t!(test8: "this-contains_ ALLKinds OfWord_Boundaries" => "This Contains All Kinds Of Word Boundaries");
+ #[cfg(feature = "unicode")]
+ t!(test9: "XΣXΣ baffle" => "Xσxς Baffle");
+ t!(test10: "XMLHttpRequest" => "Xml Http Request");
+}