Fact

interface Fact: Rule, Any

Fields

Name Description
open body: Term
open isFact: Boolean

Checks whether the current term is a fact. This method is guaranteed to return true if and only if the current term is an instance of Fact.

Methods

freshCopy

abstract fun freshCopy(): Fact

Returns a fresh copy of this Term, that is, an instance of Term which is equal to the current one in any aspect, except variables directly or indirectly contained into this Term, which are refreshed. This means that it could return itself, if no variable is present (ground term), or a new Term with freshly generated variables.

Variables are refreshed consistently, meaning that, if more variables exists within this Term having the same name, all fresh copies of such variables will have the same complete name.

Example: "f(X, g(X))".freshCopy() returns something like "f(X_1, g(X_1))" instead of "f(X_1, g(X_2))"

Notice that, if the current term is ground, the same object may be returned as a result by this method.

ReturnValue

Name Description
Fact

a fresh copy of the current term which is different because variables are consistently renamed

freshCopy

abstract fun freshCopy(scope: Scope): Fact

Returns a fresh copy of this Term, similarly to freshCopy, possibly reusing variables from the provided scope, if any

Parameters

Name Description
scope: Scope

the Scope containing variables to be used in copying

ReturnValue

Name Description
Fact

a fresh copy of the current term which is different because variables are consistently renamed

asFact

open fun asFact(): Fact

Casts the current Term to Fact, if possible, or returns null otherwise

ReturnValue

Name Description
Fact

the current Term, casted to Fact, or null, if the current term is not an instance of Fact

setHeadFunctor

abstract fun setHeadFunctor(functor: String): Fact

Parameters

Name Description
functor: String

ReturnValue

Name Description
Fact

setHeadArgs

abstract fun setHeadArgs(vararg arguments: Term): Fact

Parameters

Name Description
vararg arguments: Term

ReturnValue

Name Description
Fact

setHeadArgs

abstract fun setHeadArgs(arguments: Iterable<Term>): Fact

Parameters

Name Description
arguments: Iterable<Term>

ReturnValue

Name Description
Fact

setHeadArgs

abstract fun setHeadArgs(arguments: Sequence<Term>): Fact

Parameters

Name Description
arguments: Sequence<Term>

ReturnValue

Name Description
Fact

insertHeadArg

abstract fun insertHeadArg(index: Int, argument: Term): Fact

Parameters

Name Description
index: Int
argument: Term

ReturnValue

Name Description
Fact

addFirstHeadArg

abstract fun addFirstHeadArg(argument: Term): Fact

Parameters

Name Description
argument: Term

ReturnValue

Name Description
Fact

addLastHeadArg

abstract fun addLastHeadArg(argument: Term): Fact

Parameters

Name Description
argument: Term

ReturnValue

Name Description
Fact

appendHeadArg

abstract fun appendHeadArg(argument: Term): Fact

Parameters

Name Description
argument: Term

ReturnValue

Name Description
Fact

Extensions

prepareForExecution

fun Clause.prepareForExecution(): Clause

Prepares the receiver Clause for execution, using the provided visitor

For example, the Clause product(A) :- A, A is transformed, after preparation for execution, as the Term: product(A) :- call(A), call(A)

Receiver

Name Description
Clause

ReturnValue

Name Description
Clause

prepareForExecution

fun Clause.prepareForExecution(unifier: Unifier): Clause

Receiver

Name Description
Clause

Parameters

Name Description
unifier: Unifier

ReturnValue

Name Description
Clause

toClause

fun Term.toClause(source: Any?, line: Int, column: Int): Clause

Receiver

Name Description
Term

Parameters

Name Description
source: Any?
line: Int
column: Int

ReturnValue

Name Description
Clause

unfoldGoals

fun Term.unfoldGoals(): Sequence<Term>

Receiver

Name Description
Term

ReturnValue

Name Description
Sequence<Term>

toGoals

fun Term.toGoals(): Cursor<Term>

Receiver

Name Description
Term

ReturnValue

Name Description
Cursor<Term>

isWellFormed

fun Term.isWellFormed(): Boolean

Check whether the receiver term is a well-formed predication

Receiver

Name Description
Term

ReturnValue

Name Description
Boolean

prepareForExecutionAsGoal

fun Term.prepareForExecutionAsGoal(): Struct

Prepares the receiver Goal for execution

For example, the goal A is transformed, after preparation for execution, as the Term: call(A)

Receiver

Name Description
Term

ReturnValue

Name Description
Struct

extractSignature

fun Struct.extractSignature(): Signature

Extracts this Struct indicator and converts it to Signature

Receiver

Name Description
Struct

ReturnValue

Name Description
Signature

evalAsExpression

fun Term.evalAsExpression(request: Request<*>, index: Int?): Term

Receiver

Name Description
Term

Parameters

Name Description
request: Request<*>
index: Int?

ReturnValue

Name Description
Term

evalAsArithmeticExpression

fun Term.evalAsArithmeticExpression(request: Request<*>, index: Int?): Numeric

Receiver

Name Description
Term

Parameters

Name Description
request: Request<*>
index: Int?

ReturnValue

Name Description
Numeric

eq

infix fun Term.eq(that: Term): Equation

Creates an equation with this and that terms

Receiver

Name Description
Term

Parameters

Name Description
that: Term

ReturnValue

Name Description
Equation

CompanionObject

Fact

interface Fact: Rule, Any

Fields

Name Description
const FUNCTOR: String

Methods

of

fun of(head: Struct): Fact

Parameters

Name Description
head: Struct

ReturnValue

Name Description
Fact

template

fun template(functor: String, arity: Int): Fact

Parameters

Name Description
functor: String
arity: Int

ReturnValue

Name Description
Fact