Enum Path 

pub enum Path {
    Id,
    Pred(NamedNode),
    Inverse(Box<Path>),
    Seq(Vec<Path>),
    Alt(Vec<Path>),
    Star(Box<Path>),
}

Variants

Id

id — the identity relation / empty word.

Pred(NamedNode)

q — a single predicate step.

Inverse(Box<Path>)

π⁻ — inverse.

Seq(Vec<Path>)

π · π′ · … — sequential composition.

Alt(Vec<Path>)

π ∪ π′ ∪ … — alternation (relational union).

Star(Box<Path>)

π* — reflexive-transitive closure.

Implementations

impl Path

pub fn seq(parts: Vec<Path>) -> Path

Compose paths, flattening nested Seq and dropping id (the unit of composition, π · id = π). An empty sequence is id.

pub fn alt(parts: Vec<Path>) -> Path

Alternate paths, flattening nested Alt. An empty alternation is the empty relation (kept explicit as Alt([]) — it matches nothing).

pub fn inverse(self) -> Path

Invert, using id⁻ = id and the involution (π⁻)⁻ = π.

pub fn star(self) -> Path

Reflexive-transitive closure, using id* = id and (π*)* = π*.

pub fn one_or_more(self) -> Path

π⁺ = π · π* — one-or-more sugar (gap-analysis P1).

pub fn zero_or_one(self) -> Path

π? = π ∪ id — zero-or-one sugar (gap-analysis P1).

Trait Implementations

impl Clone for Path

fn clone(&self) -> Path

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Path

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Path

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

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for Path

impl Hash for Path

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 PartialEq for Path

fn eq(&self, other: &Path) -> 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 Serialize for Path

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

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Path