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#[cfg(feature = "serde")]
use serde::{Deserialize, Serialize};
use super::{Pattern, VariantKey};
#[cfg(feature = "walker")]
use crate::walker::{Visitor, Walkable, Walker};
/// [Variant](crate::ast::Variant) ::= line_end blank? [VariantKey](crate::ast::VariantKey) blank_inline? [Pattern](crate::ast::Pattern)
#[derive(Clone, Debug, PartialEq)]
#[cfg_attr(feature = "hash", derive(Eq, PartialOrd, Ord, Hash))]
#[cfg_attr(feature = "serde", derive(Deserialize, Serialize))]
pub struct Variant {
variant_key: VariantKey,
pattern: Pattern,
}
impl Variant {
/// Constructs a new non-default `Variant` for use in a Fluent select expression.
///
/// # Arguments
/// * `variant_key` - The key (selector value) for this variant. Typically a literal string,
// number, or plural category (e.g., `"one"`, `"few"`, `"many"`).
/// * `pattern` - The message pattern displayed when this variant is selected.
pub fn new(variant_key: VariantKey, pattern: Pattern) -> Self {
Self {
variant_key,
pattern,
}
}
/// Returns a reference to the variant key of this variant.
pub fn variant_key(&self) -> &VariantKey {
&self.variant_key
}
/// Returns a string representation of the variant key as it appears in Fluent source
/// (without the asterisk), e.g., `[one]`, `[few]`.
///
/// This is useful when serializing or pretty-printing the variant.
/// Note that default variants include a leading `*` — use `DefaultVariant::variant_key_name`
/// for those.
pub fn variant_key_name(&self) -> String {
format!("[{}]", self.variant_key)
}
/// Returns a reference to the pattern of this variant.
pub fn pattern(&self) -> &Pattern {
&self.pattern
}
}
#[cfg(feature = "walker")]
impl Walkable for Variant {
fn walk(&self, visitor: &mut dyn Visitor) {
visitor.visit_variant(self);
Walker::walk(&self.variant_key, visitor);
Walker::walk(&self.pattern, visitor);
}
}
impl std::fmt::Display for Variant {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "\n {} {}", self.variant_key_name(), self.pattern)
}
}