fluent4rs 2.3.1

Parser / codec for [Fluent FTL files](https://github.com/projectfluent/fluent/blob/master/spec/fluent.ebnf), written for [lingora](https://github.com/nigeleke/lingora) (a localization management program), and may be found to be useful outside of that context. It is not intended to replace any aspects of the [fluent-rs](https://github.com/projectfluent/fluent-rs) crate implemented by [Project Fluent](https://projectfluent.org/), and, for the majority of language translation needs, the reader is referred back to that crate.
Documentation 
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#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};

use super::{Identifier, NumberLiteral};
#[cfg(feature = "walker")]
use crate::walker::{Visitor, Walkable, Walker};

/// [VariantKey](crate::ast::VariantKey) ::= "[" blank? ([NumberLiteral](crate::ast::NumberLiteral) | [Identifier](crate::ast::Identifier)) blank? "]"
#[derive(Clone, Debug, PartialEq)]
#[cfg_attr(feature = "hash", derive(Eq, PartialOrd, Ord, Hash))]
#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
pub enum VariantKey {
    #[doc(hidden)]
    NumberLiteral(NumberLiteral),

    #[doc(hidden)]
    Identifier(Identifier),
}

#[cfg(feature = "walker")]
impl Walkable for VariantKey {
    fn walk(&self, visitor: &mut dyn Visitor) {
        visitor.visit_variant_key(self);
        match self {
            Self::NumberLiteral(literal) => Walker::walk(literal, visitor),
            Self::Identifier(identifier) => Walker::walk(identifier, visitor),
        }
    }
}

impl std::fmt::Display for VariantKey {
    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
        let value = match self {
            Self::NumberLiteral(literal) => literal.to_string(),
            Self::Identifier(identifier) => identifier.to_string(),
        };
        write!(f, "{value}")
    }
}