@opennetwork/rdf-data-model/esnext/quad.js

import { isBlankNode, isBlankNodeLike } from "./blank-node.js";
import { isNamedNode, isNamedNodeLike } from "./named-node.js";
import { isVariable, isVariableLike } from "./variable.js";
import { isLiteral, isLiteralLike } from "./literal.js";
import { isDefaultGraph, isDefaultGraphLike } from "./default-graph.js";
import { hasKey } from "./has-key.js";
export function isQuadLike(given) {
    return (hasKey(given, "subject") &&
        hasKey(given, "predicate") &&
        hasKey(given, "object") &&
        hasKey(given, "graph") &&
        isQuadSubjectLike(given.subject) &&
        isQuadPredicateLike(given.predicate) &&
        isQuadObjectLike(given.object) &&
        isQuadGraphLike(given.graph));
}
export function isQuad(given) {
    function isQuadInstance(given) {
        return typeof given === "object";
    }
    if (!isQuadInstance(given)) {
        return false;
    }
    return (isQuadSubject(given.subject) &&
        isQuadPredicate(given.predicate) &&
        isQuadObject(given.object) &&
        isQuadGraph(given.graph));
}
export function isQuadSubject(value) {
    return isNamedNode(value) || isBlankNode(value) || isVariable(value);
}
export function isQuadPredicate(value) {
    return isNamedNode(value) || isVariable(value);
}
export function isQuadObject(value) {
    return isNamedNode(value) || isLiteral(value) || isBlankNode(value) || isVariable(value);
}
export function isQuadGraph(value) {
    return isDefaultGraph(value) || isNamedNode(value) || isBlankNode(value) || isVariable(value);
}
export function isQuadSubjectLike(value) {
    return isNamedNodeLike(value) || isBlankNodeLike(value) || isVariableLike(value);
}
export function isQuadPredicateLike(value) {
    return isNamedNodeLike(value) || isVariableLike(value);
}
export function isQuadObjectLike(value) {
    return isNamedNodeLike(value) || isLiteralLike(value) || isBlankNodeLike(value) || isVariableLike(value);
}
export function isQuadGraphLike(value) {
    return isDefaultGraphLike(value) || isNamedNodeLike(value) || isBlankNodeLike(value) || isVariableLike(value);
}
export class Quad {
    constructor(subject, predicate, object, graph) {
        this.subject = subject;
        this.predicate = predicate;
        this.object = object;
        this.graph = graph;
    }
    equals(other) {
        return !!(isQuadLike(other) &&
            this.subject.equals(other.subject) &&
            this.predicate.equals(other.predicate) &&
            this.object.equals(other.object) &&
            this.graph.equals(other.graph));
    }
    toJSON() {
        return {
            subject: this.subject,
            predicate: this.predicate,
            object: this.object,
            graph: this.graph
        };
    }
}
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