Enum cedar_policy_core::ast::Value

pub enum Value {
    Lit(Literal),
    Set(Set),
    Record(Arc<BTreeMap<SmolStr, Value>>),
    ExtensionValue(Arc<ExtensionValueWithArgs>),
}

This describes all the values which could be the dynamic result of evaluating an Expr. Cloning is O(1).

Variants

Lit(Literal)

anything that is a Literal can also be the dynamic result of evaluating an Expr

Set(Set)

Evaluating an Expr can result in a first-class set

Record(Arc<BTreeMap<SmolStr, Value>>)

Evaluating an Expr can result in a first-class anonymous record (keyed on String)

ExtensionValue(Arc<ExtensionValueWithArgs>)

Evaluating an Expr can result in an extension value

Implementations

impl Value

pub fn empty_set() -> Self

Create a new empty set

pub fn empty_record() -> Self

Create a new empty record

pub fn set(vals: impl IntoIterator<Item = Value>) -> Self

Create a set with the given Values as elements

pub fn set_of_lits(lits: impl IntoIterator<Item = Literal>) -> Self

Create a set with the given Literals as elements

Trait Implementations

impl Clone for Value

fn clone(&self) -> Value

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for Value

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Value

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Display for Value

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

Formats the value using the given formatter.

impl<S> From<BTreeMap<S, Value>> for Value

where S: Into<SmolStr>,

Create a Value::Record from a map of String to Value

fn from(map: BTreeMap<S, Value>) -> Self

Converts to this type from the input type.

impl<S> From<HashMap<S, Value>> for Value

where S: Into<SmolStr>,

As above, create a Value::Record from a map of SmolStr to Value. This implementation provides conversion from HashMap while the earlier implementation provides conversion from BTreeMap

fn from(map: HashMap<S, Value>) -> Self

Converts to this type from the input type.

impl<T: Into<Literal>> From<T> for Value

Create a Value directly from a Literal, or from anything that implements Into<Literal> (so i64, &str, EntityUID, etc)

fn from(lit: T) -> Self

Converts to this type from the input type.

impl From<Value> for Expr

fn from(v: Value) -> Self

Converts to this type from the input type.

impl From<Vec<(SmolStr, Value)>> for Value

Create a Value directly from a Vec of (String, Value) pairs, which will be interpreted as (field, value) pairs for a first-class record

fn from(v: Vec<(SmolStr, Value)>) -> Self

Converts to this type from the input type.

impl<T: Into<Value>> From<Vec<T>> for Value

Create a Value directly from a Vec<Value>, or Vec<T> where T: Into<Value> (so Vec<i64>, Vec<String>, etc)

fn from(v: Vec<T>) -> Self

Converts to this type from the input type.

impl FromIterator<Value> for Set

fn from_iter<T: IntoIterator<Item = Value>>(iter: T) -> Self

Creates a value from an iterator.

impl Ord for Value

fn cmp(&self, other: &Value) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized + PartialOrd,

Restrict a value to a certain interval.

impl PartialEq for Value

fn eq(&self, other: &Value) -> bool

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

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.

impl PartialOrd for Value

fn partial_cmp(&self, other: &Value) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

This method tests less than (for self and other) and is used by the < operator.

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

This method tests less than or equal to (for self and other) and is used by the <= operator.

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

This method tests greater than (for self and other) and is used by the > operator.

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

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl Serialize for Value

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StaticallyTyped for Value

fn type_of(&self) -> Type

Get the object’s type

impl TryFrom<Expr> for Value

type Error = NotValue

The type returned in the event of a conversion error.

fn try_from(value: Expr) -> Result<Self, Self::Error>

Performs the conversion.

impl TryFrom<PartialValue> for Value

type Error = NotValue

The type returned in the event of a conversion error.

fn try_from(value: PartialValue) -> Result<Self, Self::Error>

Performs the conversion.

impl Eq for Value