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, lowercase, transform};
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/// This trait defines a lower camel case conversion.
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///
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/// In lowerCamelCase, word boundaries are indicated by capital letters,
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/// excepting 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::ToLowerCamelCase;
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///
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/// let sentence = "It is we who built these palaces and cities.";
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/// assert_eq!(sentence.to_lower_camel_case(), "itIsWeWhoBuiltThesePalacesAndCities");
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/// ```
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pub trait ToLowerCamelCase: ToOwned {
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/// Convert this type to lower camel case.
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fn to_lower_camel_case(&self) -> Self::Owned;
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}
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impl ToLowerCamelCase for str {
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fn to_lower_camel_case(&self) -> String {
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AsLowerCamelCase(self).to_string()
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}
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}
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/// This wrapper performs a lower 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::AsLowerCamelCase;
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///
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/// let sentence = "It is we who built these palaces and cities.";
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/// assert_eq!(format!("{}", AsLowerCamelCase(sentence)), "itIsWeWhoBuiltThesePalacesAndCities");
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/// ```
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pub struct AsLowerCamelCase<T: AsRef<str>>(pub T);
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impl<T: AsRef<str>> fmt::Display for AsLowerCamelCase<T> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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let mut first = true;
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transform(
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self.0.as_ref(),
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|s, f| {
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if first {
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first = false;
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lowercase(s, f)
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} else {
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capitalize(s, f)
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}
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},
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|_| Ok(()),
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f,
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)
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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::ToLowerCamelCase;
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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_lower_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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