Struct fluent_syntax::ast::Variant

source ·

pub struct Variant<S> {
    pub key: VariantKey<S>,
    pub value: Pattern<S>,
    pub default: bool,
}

Expand description

Variant is a single branch of a value in a Select expression.

It’s a pair of VariantKey and Pattern. If the selector match the key, then the value of the variant is returned as the value of the expression.

§Example

use fluent_syntax::parser;
use fluent_syntax::ast;

let ftl = r#"

hello-world = { $var ->
    [key1] Value 1
   *[other] Value 2
}

"#;

let resource = parser::parse(ftl)
    .expect("Failed to parse an FTL resource.");

assert_eq!(
    resource,
    ast::Resource {
        body: vec![
            ast::Entry::Message(ast::Message {
                id: ast::Identifier {
                    name: "hello-world"
                },
                value: Some(ast::Pattern {
                    elements: vec![
                        ast::PatternElement::Placeable {
                            expression: ast::Expression::Select {
                                selector: ast::InlineExpression::VariableReference {
                                    id: ast::Identifier { name: "var" },
                                },
                                variants: vec![
                                    ast::Variant {
                                        key: ast::VariantKey::Identifier {
                                            name: "key1"
                                        },
                                        value: ast::Pattern {
                                            elements: vec![
                                                ast::PatternElement::TextElement {
                                                    value: "Value 1",
                                                }
                                            ]
                                        },
                                        default: false,
                                    },
                                    ast::Variant {
                                        key: ast::VariantKey::Identifier {
                                            name: "other"
                                        },
                                        value: ast::Pattern {
                                            elements: vec![
                                                ast::PatternElement::TextElement {
                                                    value: "Value 2",
                                                }
                                            ]
                                        },
                                        default: true,
                                    },
                                ]
                            }
                        }
                    ]
                }),
                attributes: vec![],
                comment: None,
            }),
        ]
    }
);