mago_casing/
pascal.rs

1use std::borrow::Cow;
2
3use crate::common::CamelLikeOptions;
4use crate::common::is_case_camel_like;
5use crate::common::to_case_camel_like;
6
7const OPTIONS: CamelLikeOptions = CamelLikeOptions {
8    new_word: true,
9    first_word: false,
10    separator: b' ',
11    has_separator: false,
12    inverted: false,
13    concat_num: true,
14};
15
16/// Converts input bytes to canonical ASCII `PascalCase`.
17///
18/// The function returns a borrowed slice when the input is already canonical,
19/// otherwise it returns an owned normalized buffer.
20#[inline]
21#[must_use]
22pub fn to_pascal_case<T>(input: &T) -> Cow<'_, [u8]>
23where
24    T: AsRef<[u8]> + ?Sized,
25{
26    to_case_camel_like(input.as_ref(), OPTIONS)
27}
28
29/// Returns `true` when input is canonical ASCII `PascalCase`.
30#[inline]
31#[must_use]
32pub fn is_pascal_case<T>(input: T) -> bool
33where
34    T: AsRef<[u8]>,
35{
36    is_case_camel_like(input.as_ref(), OPTIONS)
37}
38
39#[cfg(test)]
40mod tests {
41    use super::is_pascal_case;
42    use super::to_pascal_case;
43
44    #[test]
45    fn converts_examples() {
46        assert_eq!(to_pascal_case("fooBar").as_ref(), b"FooBar");
47        assert_eq!(to_pascal_case("FOO_BAR").as_ref(), b"FooBar");
48        assert_eq!(to_pascal_case("Foo Bar").as_ref(), b"FooBar");
49        assert_eq!(to_pascal_case("foo_bar").as_ref(), b"FooBar");
50        assert_eq!(to_pascal_case("Foo bar").as_ref(), b"FooBar");
51        assert_eq!(to_pascal_case("foo-bar").as_ref(), b"FooBar");
52        assert_eq!(to_pascal_case("FooBar").as_ref(), b"FooBar");
53        assert_eq!(to_pascal_case("FooBar3").as_ref(), b"FooBar3");
54    }
55
56    #[test]
57    fn checks_examples() {
58        assert!(is_pascal_case("Foo"));
59        assert!(is_pascal_case("FooBarIsAReallyReallyLongString"));
60        assert!(is_pascal_case("FooBarIsAReallyReally3LongString"));
61
62        assert!(!is_pascal_case("foo"));
63        assert!(!is_pascal_case("foo-bar-string-that-is-really-really-long"));
64        assert!(!is_pascal_case("FOO_BAR_STRING_THAT_IS_REALLY_REALLY_LONG"));
65        assert!(!is_pascal_case("foo_bar_string_that_is_really_really_long"));
66        assert!(!is_pascal_case("Foo bar string that is really really long"));
67        assert!(!is_pascal_case("Foo Bar Is A Really Really Long String"));
68    }
69
70    #[test]
71    fn supports_byte_input() {
72        assert_eq!(to_pascal_case(b"foo_bar").as_ref(), b"FooBar");
73        assert!(is_pascal_case(b"FooBar"));
74    }
75
76    #[test]
77    fn borrows_when_already_canonical() {
78        let input = b"FooBar";
79        assert!(matches!(to_pascal_case(input), std::borrow::Cow::Borrowed(_)));
80    }
81}
mago_casing/pascal.rs

mago_casing/
pascal.rs
