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,
            }),
        ]
    }
);

Fields§

§key: VariantKey<S>§value: Pattern<S>§default: bool

Trait Implementations§

source§

impl<S: Clone> Clone for Variant<S>

source§

fn clone(&self) -> Variant<S>

Returns a copy of the value. Read more
1.0.0 · source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
source§

impl<S: Debug> Debug for Variant<S>

source§

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
source§

impl<S: PartialEq> PartialEq for Variant<S>

source§

fn eq(&self, other: &Variant<S>) -> bool

This method tests for self and other values to be equal, and is used by ==.
1.0.0 · source§

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
source§

impl<S> StructuralPartialEq for Variant<S>

Auto Trait Implementations§

§

impl<S> Freeze for Variant<S>
where S: Freeze,

§

impl<S> RefUnwindSafe for Variant<S>
where S: RefUnwindSafe,

§

impl<S> Send for Variant<S>
where S: Send,

§

impl<S> Sync for Variant<S>
where S: Sync,

§

impl<S> Unpin for Variant<S>
where S: Unpin,

§

impl<S> UnwindSafe for Variant<S>
where S: UnwindSafe,

Blanket Implementations§

source§

impl<T> Any for T
where T: 'static + ?Sized,

source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
source§

impl<T> Borrow<T> for T
where T: ?Sized,

source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
source§

impl<T> From<T> for T

source§

fn from(t: T) -> T

Returns the argument unchanged.

source§

impl<T, U> Into<U> for T
where U: From<T>,

source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

source§

impl<T> ToOwned for T
where T: Clone,

§

type Owned = T

The resulting type after obtaining ownership.
source§

fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
source§

fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

§

type Error = Infallible

The type returned in the event of a conversion error.
source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.