Struct cel_interpreter::extractors::Identifier

pub struct Identifier(pub Arc<String>);

Identifier is an argument extractor that attempts to extract an identifier from an argument’s expression. It fails if the argument is not available, or if the argument cannot be converted into an expression.

Examples

Identifiers are useful for functions like .map or .filter where one of the arguments is the declaration of a variable. In this case, as noted below, the x is an identifier, and we want to be able to parse it automatically.

//        Identifier
//            ↓
[1, 2, 3].map(x, x * 2) == [2, 4, 6]

The function signature for the Rust implementation of map looks like this

pub fn map(
    ftx: &FunctionContext,
    This(this): This<Value>, // <- [1, 2, 3]
    ident: Identifier,       // <- x
    expr: Expression,        // <- x * 2
) -> Result<Value>;

Tuple Fields

0: Arc<String>

Trait Implementations

impl Clone for Identifier

fn clone(&self) -> Identifier

Returns a copy of the value.

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

Performs copy-assignment from source.

impl From<&Identifier> for String

fn from(value: &Identifier) -> Self

Converts to this type from the input type.

impl From<Identifier> for String

fn from(value: Identifier) -> Self

Converts to this type from the input type.