Enum Predicate 

pub enum Predicate {
    Always,
    Compare {
        attr: String,
        op: Comparison,
        value: Value,
    },
    AllOf {
        matchers: Vec<Predicate>,
    },
    AnyOf {
        matchers: Vec<Predicate>,
    },
    Not {
        matcher: Box<Predicate>,
    },
}

One node of the predicate tree. Tagged via kind for serde so the JSON stays readable.

Variants

Always

Always true. Useful as a default-match.

Compare

Look at subject.attrs[attr] and compare it to value with op.

Fields

attr: String

Attribute key (e.g. "country", "plan", "email").

op: Comparison

Comparison operator.

value: Value

Right-hand side.

AllOf

All children must match.

Fields

matchers: Vec<Predicate>

Children.

AnyOf

At least one child must match.

Fields

matchers: Vec<Predicate>

Children.

Not

Inverts the child.

Fields

matcher: Box<Predicate>

Child.

Implementations

impl Predicate

pub fn matches(&self, subject: &Subject) -> bool

Evaluate against a subject. Missing attrs make every comparison false (except NotIn against a list — that’s still true if the value isn’t there).

Trait Implementations

impl Clone for Predicate

fn clone(&self) -> Predicate

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Predicate

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Predicate

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for Predicate

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

where __S: Serializer,

Serialize this value into the given Serde serializer.