build(ariadne): vendor clap

third_party/crates/heck-0.5.0/src/lower_camel.rs

@@ -0,0 +1,88 @@
+use core::fmt;
+
+use alloc::{
+    borrow::ToOwned,
+    string::{String, ToString},
+};
+
+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");
+    t!(test9: "XΣXΣ baffle" => "xσxςBaffle");
+    t!(test10: "XMLHttpRequest" => "xmlHttpRequest");
+}