Enum Binding

pub enum Binding {
    Attribute(AttributeBinding),
    Not(AntijoinBinding),
    Constant(ConstantBinding),
    BinaryPredicate(BinaryPredicateBinding),
}

Binding types supported by Hector.

Variants

Attribute(AttributeBinding)

Two variables bound by (e,v) pairs from an attribute.

Not(AntijoinBinding)

Variables that must not be bound by the wrapped binding.

Constant(ConstantBinding)

A variable bound by a constant value.

BinaryPredicate(BinaryPredicateBinding)

Two variables bound by a binary predicate.

Implementations

impl Binding

pub fn attribute(e: u32, name: &str, v: u32) -> Binding

Creates an AttributeBinding.

pub fn constant(variable: u32, value: Value) -> Binding

Creates a ConstantBinding.

pub fn binary_predicate(predicate: BinaryPredicate, x: u32, y: u32) -> Binding

Creates a BinaryPredicateBinding.

pub fn not(binding: Binding) -> Binding

Creates an AntijoinBinding.

Trait Implementations

impl AsBinding for Binding

fn variables(&self) -> Vec<u32>

All variables bound by this binding.

fn binds(&self, variable: u32) -> Option<usize>

Iff the binding has opinions about the given variable, this will return the offset, otherwise None.

fn ready_to_extend(&self, prefix: &dyn AsBinding) -> Option<u32>

Returns an optional variable by which this binding could extend the given prefix.

fn required_to_extend( &self, prefix: &dyn AsBinding, target: u32, ) -> Option<Option<u32>>

Returns an optional variable which must be bound by the prefix in order for this binding to extend the prefix. If None, then this binding can never be used to extend the prefix to the specified variable (e.g. because it doesn’t even bind it).

fn can_extend(&self, prefix: &dyn AsBinding, target: u32) -> bool

Returns true iff the binding is ready to participate in the extension of a set of prefix variables to a new variable.

impl Clone for Binding

fn clone(&self) -> Binding

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Binding

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Binding

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Hash for Binding

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for Binding

fn cmp(&self, other: &Binding) -> 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,

Restrict a value to a certain interval.

impl PartialEq for Binding

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Binding

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

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

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

Tests less than (for self and other) and is used by the < operator.

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

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

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

Tests greater than (for self and other) and is used by the > operator.

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

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

impl Serialize for Binding

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl Eq for Binding

impl StructuralPartialEq for Binding