Struct Predicate 

pub struct Predicate {
    pub name: String,
    pub required_key: String,
    pub expected_value: Option<String>,
}

A predicate that guards combinator execution.

Fields

name: String

Name of the predicate (for tracing).

required_key: String

The key in the input that must exist and be truthy.

expected_value: Option<String>

Expected value (if None, just check existence).

Implementations

impl Predicate

pub fn evaluate(&self, input: &CombinatorInput) -> bool

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.