Enum Term 

pub enum Term {
    Atom(AtomId),
    Var(VarId),
    Integer(i64),
    Float(f64),
    Compound {
        functor: AtomId,
        args: Vec<Term>,
    },
    List {
        head: Box<Term>,
        tail: Box<Term>,
    },
}

Prolog term representation.

Variants

Atom(AtomId)

Var(VarId)

Integer(i64)

Float(f64)

Compound

Fields

functor: AtomId

args: Vec<Term>

List

Fields

head: Box<Term>

tail: Box<Term>

Implementations

impl Term

pub fn functor_arity(&self) -> Option<(AtomId, usize)>

Extract functor AtomId and arity for a term used as a goal/head.

• Atom: (atom_id, 0)
• Compound: (functor, len(args))
• Others: None

pub fn first_arg_key(&self) -> Option<FirstArgKey>

Extract the first-argument indexing key from a term used as a clause head.

pub fn is_var(&self) -> bool

Check if this term is a variable.

Trait Implementations

impl Clone for Term

fn clone(&self) -> Term

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Term

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

Formats the value using the given formatter.

impl PartialEq for Term

fn eq(&self, other: &Term) -> 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 StructuralPartialEq for Term