1 files changed, 56 insertions, 0 deletions
diff --git a/heck/src/mixed.rs b/heck/src/mixed.rs
new file mode 100644
index 0000000..7736684
--- /dev/null
+++ b/heck/src/mixed.rs
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+/// This trait defines a mixed case conversion.
+///
+/// In mixedCase, word boundaries are indicated by capital letters, excepting
+/// the first word.
+///
+/// ## Example:
+///
+/// ```rust
+/// extern crate heck;
+/// fn main() {
+///     
+///     use heck::MixedCase;
+///
+///     let sentence = "It is we who built these palaces and cities.";
+///     assert_eq!(sentence.to_mixed_case(), "itIsWeWhoBuiltThesePalacesAndCities");
+/// }
+/// ```
+pub trait MixedCase: ToOwned {
+    /// Convert this type to mixed case.
+    fn to_mixed_case(&self) -> Self::Owned;
+}
+
+impl MixedCase for str {
+    fn to_mixed_case(&self) -> String {
+        ::transform(self, |s, out| {
+            if out.is_empty() { ::lowercase(s, out); }
+            else { ::capitalize(s, out) }
+        }, |_| {})
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::MixedCase;
+
+    macro_rules! t {
+        ($t:ident : $s1:expr => $s2:expr) => {
+            #[test]
+            fn $t() {
+                assert_eq!($s1.to_mixed_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");
+    t!(test9: "XΣXΣ baﬄe" => "xσxςBaﬄe");
+    t!(test10: "XMLHttpRequest" => "xmlHttpRequest");
+    // TODO unicode tests
+}