1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
use convert_case::Case;
use crate::common::ConvertCasing;
/// Types convertible to the letter casing corresponding to names of
/// [enum](https://doc.rust-lang.org/rust-by-example/custom_types/enum.html) variants.
pub trait ToVariantName {
/// The resulting type, coming out of the conversion.
type Output;
/// Converts self to the letter casing of
/// [enum](https://doc.rust-lang.org/rust-by-example/custom_types/enum.html) variant names
/// (`PascalCase`). Adheres to the [general conversion
/// rules](crate#general-rules-for-conversions).
///
/// # Examples
///
/// Usage with [`syn::Ident`]:
///
/// ```
/// # use caseidae::ToVariantName;
/// # use syn::Ident;
/// # use proc_macro2::Span;
/// let function_name = Ident::new("paint_color", Span::call_site());
/// let variant_name = function_name.to_variant_name();
/// assert_eq!(variant_name, "PaintColor");
/// ```
///
/// Usage with strings:
///
/// ```
/// # use caseidae::ToVariantName;
/// assert_eq!("ONION_LAYER_COUNT".to_variant_name(), "OnionLayerCount");
/// assert_eq!(String::from("alex_and_der_murder").to_variant_name(), "AlexAndDerMurder");
/// ```
///
/// # Panics
///
/// Whether this method panics depends on the implementator, see their documentation for that.
/// However, implementations from this crate never panic.
fn to_variant_name(&self) -> Self::Output;
}
impl ToVariantName for str {
type Output = <Self as ToOwned>::Owned;
fn to_variant_name(&self) -> Self::Output {
self.convert_casing(Case::Pascal)
}
}
#[cfg(feature = "syn")]
impl ToVariantName for syn::Ident {
type Output = <Self as ToOwned>::Owned;
fn to_variant_name(&self) -> Self::Output {
use crate::common::ConstructRawHandled;
Self::Output::new_raw_handled(self.to_string().to_variant_name().as_str(), self.span())
}
}