import { JsonLdContextNormalized } from "jsonld-context-parser";
import * as RDF from "@rdfjs/types";
import { AnnotationsBufferEntry, ParsingContext } from "./ParsingContext";
/**
 * Utility functions and methods.
 */
export declare class Util {
    static readonly XSD: string;
    static readonly XSD_BOOLEAN: string;
    static readonly XSD_INTEGER: string;
    static readonly XSD_DOUBLE: string;
    static readonly RDF: string;
    readonly dataFactory: RDF.DataFactory<RDF.BaseQuad>;
    readonly rdfFirst: RDF.NamedNode;
    readonly rdfRest: RDF.NamedNode;
    readonly rdfNil: RDF.NamedNode;
    readonly rdfType: RDF.NamedNode;
    readonly rdfJson: RDF.NamedNode;
    private readonly parsingContext;
    constructor(options: {
        parsingContext: ParsingContext;
        dataFactory?: RDF.DataFactory<RDF.BaseQuad>;
    });
    /**
     * Helper function to get the value of a context entry,
     * or fallback to a certain value.
     * @param {JsonLdContextNormalized} context A JSON-LD context.
     * @param {string} contextKey A pre-defined JSON-LD key in context entries.
     * @param {string} key A context entry key.
     * @param {string} fallback A fallback value for when the given contextKey
     *                          could not be found in the value with the given key.
     * @return {string} The value of the given contextKey in the entry behind key in the given context,
     *                  or the given fallback value.
     */
    static getContextValue<FB>(context: JsonLdContextNormalized, contextKey: string, key: string, fallback: FB): string | any | FB;
    /**
     * Get the container type of the given key in the context.
     *
     * Should any context-scoping bugs should occur related to this in the future,
     * it may be required to increase the offset from the depth at which the context is retrieved by one (to 2).
     * This is because containers act 2 levels deep.
     *
     * @param {JsonLdContextNormalized} context A JSON-LD context.
     * @param {string} key A context entry key.
     * @return {string} The container type.
     */
    static getContextValueContainer(context: JsonLdContextNormalized, key: string): {
        [typeName: string]: boolean;
    };
    /**
     * Get the value type of the given key in the context.
     * @param {JsonLdContextNormalized} context A JSON-LD context.
     * @param {string} key A context entry key.
     * @return {string} The node type.
     */
    static getContextValueType(context: JsonLdContextNormalized, key: string): string | null;
    /**
     * Get the language of the given key in the context.
     * @param {JsonLdContextNormalized} context A JSON-LD context.
     * @param {string} key A context entry key.
     * @return {string} The node type.
     */
    static getContextValueLanguage(context: JsonLdContextNormalized, key: string): string | null;
    /**
     * Get the direction of the given key in the context.
     * @param {JsonLdContextNormalized} context A JSON-LD context.
     * @param {string} key A context entry key.
     * @return {string} The node type.
     */
    static getContextValueDirection(context: JsonLdContextNormalized, key: string): string;
    /**
     * Check if the given key in the context is a reversed property.
     * @param {JsonLdContextNormalized} context A JSON-LD context.
     * @param {string} key A context entry key.
     * @return {boolean} If the context value has a @reverse key.
     */
    static isContextValueReverse(context: JsonLdContextNormalized, key: string): boolean;
    /**
     * Get the @index of the given key in the context.
     * @param {JsonLdContextNormalized} context A JSON-LD context.
     * @param {string} key A context entry key.
     * @return {string} The index.
     */
    static getContextValueIndex(context: JsonLdContextNormalized, key: string): any | null;
    /**
     * Check if the given key refers to a reversed property.
     * @param {JsonLdContextNormalized} context A JSON-LD context.
     * @param {string} key The property key.
     * @param {string} parentKey The parent key.
     * @return {boolean} If the property must be reversed.
     */
    static isPropertyReverse(context: JsonLdContextNormalized, key: string, parentKey: string): boolean;
    /**
     * Check if the given key exists inside an embedded node as direct child.
     * @param {string} parentKey The parent key.
     * @return {boolean} If the property is embedded.
     */
    static isPropertyInEmbeddedNode(parentKey: string): boolean;
    /**
     * Check if the given key exists inside an annotation object as direct child.
     * @param {string} parentKey The parent key.
     * @return {boolean} If the property is an annotation.
     */
    static isPropertyInAnnotationObject(parentKey: string): boolean;
    /**
     * Check if the given IRI is valid.
     * @param {string} iri A potential IRI.
     * @return {boolean} If the given IRI is valid.
     */
    static isValidIri(iri: string | null): boolean;
    /**
     * Check if the given first array (needle) is a prefix of the given second array (haystack).
     * @param needle An array to check if it is a prefix.
     * @param haystack An array to look in.
     */
    static isPrefixArray(needle: string[], haystack: string[]): boolean;
    /**
     * Make sure that @id-@index pairs are equal over all array values.
     * Reject otherwise.
     * @param {any[]} value An array value.
     * @return {Promise<void>} A promise rejecting if conflicts are present.
     */
    validateValueIndexes(value: any[]): Promise<void>;
    /**
     * Convert a given JSON value to an RDF term.
     * @param {JsonLdContextNormalized} context A JSON-LD context.
     * @param {string} key The current JSON key.
     * @param value A JSON value.
     * @param {number} depth The depth the value is at.
     * @param {string[]} keys The path of keys.
     * @return {Promise<RDF.Term[]>} An RDF term array.
     */
    valueToTerm(context: JsonLdContextNormalized, key: string, value: any, depth: number, keys: string[]): Promise<RDF.Term[]>;
    /**
     * If the context defines a property-scoped context for the given key,
     * that context will be returned.
     * Otherwise, the given context will be returned as-is.
     *
     * This should be used for valueToTerm cases that are not objects.
     * @param context A context.
     * @param key A JSON key.
     */
    getContextSelfOrPropertyScoped(context: JsonLdContextNormalized, key: string): Promise<JsonLdContextNormalized>;
    /**
     * If the given term is null, return an empty array, otherwise return an array with the single given term.
     * @param term A term.
     */
    nullableTermToArray(term: RDF.Term | null): RDF.Term[];
    /**
     * Convert a given JSON key to an RDF predicate term,
     * based on @vocab.
     * @param {JsonLdContextNormalized} context A JSON-LD context.
     * @param key A JSON key.
     * @return {RDF.NamedNode} An RDF named node.
     */
    predicateToTerm(context: JsonLdContextNormalized, key: string): RDF.Term | null;
    /**
     * Convert a given JSON key to an RDF resource term or blank node,
     * based on @base.
     * @param {JsonLdContextNormalized} context A JSON-LD context.
     * @param key A JSON key.
     * @return {RDF.NamedNode} An RDF named node or null.
     */
    resourceToTerm(context: JsonLdContextNormalized, key: string): RDF.NamedNode | RDF.BlankNode | null;
    /**
     * Convert a given JSON key to an RDF resource term.
     * It will do this based on the @vocab,
     * and fallback to @base.
     * @param {JsonLdContextNormalized} context A JSON-LD context.
     * @param key A JSON key.
     * @return {RDF.NamedNode} An RDF named node or null.
     */
    createVocabOrBaseTerm(context: JsonLdContextNormalized, key: string): RDF.Term | null;
    /**
     * Ensure that the given value becomes a string.
     * @param {string | number} value A string or number.
     * @param {NamedNode} datatype The intended datatype.
     * @return {string} The returned string.
     */
    intToString(value: string | number, datatype: RDF.NamedNode | null): string;
    /**
     * Convert a given JSON string value to an RDF term.
     * @param {number} depth The current stack depth.
     * @param {JsonLdContextNormalized} context A JSON-LD context.
     * @param {string} key The current JSON key.
     * @param {string} value A JSON value.
     * @param {NamedNode} defaultDatatype The default datatype for the given value.
     * @return {RDF.Term} An RDF term or null.
     */
    stringValueToTerm(depth: number, context: JsonLdContextNormalized, key: string, value: string | number, defaultDatatype: RDF.NamedNode | null): RDF.Term | null;
    /**
     * Create a literal for the given value with the given language and direction.
     * Auxiliary quads may be emitted.
     * @param {number} depth The current stack depth.
     * @param {string} value A string value.
     * @param {string} language A language tag.
     * @param {string} direction A direction.
     * @return {Term} An RDF term.
     */
    createLanguageDirectionLiteral(depth: number, value: string, language: string | null, direction: string): RDF.Term;
    /**
     * Stringify the given JSON object to a canonical JSON string.
     * @param value Any valid JSON value.
     * @return {string} A canonical JSON string.
     */
    valueToJsonString(value: any): string;
    /**
     * If the key is not a keyword, try to check if it is an alias for a keyword,
     * and if so, un-alias it.
     * @param {string} key A key, can be falsy.
     * @param {string[]} keys The path of keys.
     * @param {number} depth The depth to
     * @param {boolean} disableCache If the cache should be disabled
     * @param {JsonLdContextNormalized} context A context to unalias with,
     *                                           will fallback to retrieving the context for the given keys.
     * @return {Promise<string>} A promise resolving to the key itself, or another key.
     */
    unaliasKeyword(key: any, keys: string[], depth: number, disableCache?: boolean, context?: JsonLdContextNormalized): Promise<any>;
    /**
     * Unalias the keyword of the parent.
     * This adds a safety check if no parent exist.
     * @param {any[]} keys A stack of keys.
     * @param {number} depth The current depth.
     * @return {Promise<any>} A promise resolving to the parent key, or another key.
     */
    unaliasKeywordParent(keys: any[], depth: number): Promise<any>;
    /**
     * Un-alias all keywords in the given hash.
     * @param {{[p: string]: any}} hash A hash object.
     * @param {string[]} keys The path of keys.
     * @param {number} depth The depth.
     * @param {JsonLdContextNormalized} context A context to unalias with,
     *                                           will fallback to retrieving the context for the given keys.
     * @return {Promise<{[p: string]: any}>} A promise resolving to the new hash.
     */
    unaliasKeywords(hash: {
        [id: string]: any;
    }, keys: string[], depth: number, context?: JsonLdContextNormalized): Promise<{
        [id: string]: any;
    }>;
    /**
     * Check if we are processing a literal (including JSON literals) at the given depth.
     * This will also check higher levels,
     * because if a parent is a literal,
     * then the deeper levels are definitely a literal as well.
     * @param {any[]} keys The keys.
     * @param {number} depth The depth.
     * @return {boolean} If we are processing a literal.
     */
    isLiteral(keys: any[], depth: number): Promise<boolean>;
    /**
     * Check how many parents should be skipped for checking the @graph for the given node.
     *
     * @param {number} depth The depth of the node.
     * @param {any[]} keys An array of keys.
     * @return {number} The graph depth offset.
     */
    getDepthOffsetGraph(depth: number, keys: any[]): Promise<number>;
    /**
     * Check if the given subject is of a valid type.
     * This should be called when applying @reverse'd properties.
     * @param {Term} subject A subject.
     */
    validateReverseSubject(subject: RDF.Term): void;
    /**
     * Get the default graph.
     * @return {Term} An RDF term.
     */
    getDefaultGraph(): RDF.NamedNode | RDF.BlankNode | RDF.DefaultGraph;
    /**
     * Get the current graph, while taking into account a graph that can be defined via @container: @graph.
     * If not within a graph container, the default graph will be returned.
     * @param keys The current keys.
     * @param depth The current depth.
     */
    getGraphContainerValue(keys: any[], depth: number): Promise<RDF.NamedNode | RDF.BlankNode | RDF.DefaultGraph>;
    /**
     * Get the properties depth for retrieving properties.
     *
     * Typically, the properties depth will be identical to the given depth.
     *
     * The following exceptions apply:
     * * When the parent is @reverse, the depth is decremented by one.
     * * When @nest parents are found, the depth is decremented by the number of @nest parents.
     * If in combination with the exceptions above an intermediary array is discovered,
     * the depth is also decremented by this number of arrays.
     *
     * @param keys The current key chain.
     * @param depth The current depth.
     */
    getPropertiesDepth(keys: any[], depth: number): Promise<number>;
    /**
     * Get the key for the current container entry.
     * @param key A key, can be falsy.
     * @param keys The key chain.
     * @param depth The current depth to get the key from.
     * @return Promise resolving to the key.
     *         Null will be returned for @none entries, with aliasing taken into account.
     */
    getContainerKey(key: any, keys: string[], depth: number): Promise<any>;
    /**
     * Check if no reverse properties are present in embedded nodes.
     * @param key The current key.
     * @param reverse If a reverse property is active.
     * @param isEmbedded If we're in an embedded node.
     */
    validateReverseInEmbeddedNode(key: string, reverse: boolean, isEmbedded: boolean): void;
    /**
     * Emit a quad, with checks.
     * @param depth The current depth.
     * @param subject S
     * @param predicate P
     * @param object O
     * @param graph G
     * @param reverse If a reverse property is active.
     * @param isEmbedded If we're in an embedded node.
     */
    emitQuadChecked(depth: number, subject: RDF.Term, predicate: RDF.Term, object: RDF.Term, graph: RDF.Term, reverse: boolean, isEmbedded: boolean): void;
    protected emitAnnotation(depth: number, quad: RDF.BaseQuad, annotation: AnnotationsBufferEntry): void;
}