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use crate::common::ConvertCasing;
use convert_case::Case;
/// Types convertible to the letter casing corresponding to names of
/// [constant items](https://doc.rust-lang.org/reference/items/constant-items.html).
pub trait ToConstantName {
/// The resulting type, coming out of the conversion.
type Output;
/// Converts self to the letter casing of [constant
/// item](https://doc.rust-lang.org/reference/items/constant-items.html) names
/// (`SCREAMING_SNAKE_CASE`). Adheres to the [general conversion
/// rules](crate#general-rules-for-conversions).
///
/// # Examples
///
/// Usage with [`syn::Ident`]:
///
/// ```
/// # use caseidae::ToConstantName;
/// # use syn::Ident;
/// # use proc_macro2::Span;
/// let struct_name = Ident::new("SecondsToSelfDestruct", Span::call_site());
/// let constant_name = struct_name.to_constant_name();
/// assert_eq!(constant_name, "SECONDS_TO_SELF_DESTRUCT");
/// ```
///
/// Usage with strings:
///
/// ```
/// # use caseidae::ToConstantName;
/// assert_eq!("emperor_zurg_max_health".to_constant_name(), "EMPEROR_ZURG_MAX_HEALTH");
/// assert_eq!(String::from("AlexAndDerMurder").to_constant_name(), "ALEX_AND_DER_MURDER");
/// ```
///
/// # Panics
///
/// Whether this method panics depends on the implementator, see their documentation for that.
/// However, implementations from this crate never panic.
fn to_constant_name(&self) -> Self::Output;
}
impl ToConstantName for str {
type Output = <Self as ToOwned>::Owned;
fn to_constant_name(&self) -> Self::Output {
self.convert_casing(Case::Constant)
}
}
#[cfg(feature = "syn")]
impl ToConstantName for syn::Ident {
type Output = <Self as ToOwned>::Owned;
fn to_constant_name(&self) -> Self::Output {
use crate::common::ConstructRawHandled;
Self::Output::new_raw_handled(self.to_string().to_constant_name().as_str(), self.span())
}
}