import type * as RDF from '@rdfjs/types';
import { Parser as HtmlParser } from 'htmlparser2';
import { Transform } from 'readable-stream';
import type { IHtmlParseListener } from './IHtmlParseListener';
import type { IItemScope } from './IItemScope';
import type { IVocabRegistry } from './IVocabRegistry';
import EventEmitter = NodeJS.EventEmitter;
/**
 * A stream transformer that parses Microdata (text) streams to an {@link RDF.Stream}.
 */
export declare class MicrodataRdfParser extends Transform implements RDF.Sink<EventEmitter, RDF.Stream> {
    private static readonly ITEM_PROPERTY_HANDLERS;
    private readonly options;
    private readonly util;
    private readonly defaultGraph?;
    private readonly parser;
    private readonly htmlParseListener?;
    private readonly vocabRegistry;
    private itemScopeStack;
    private textBufferStack;
    private isEmittingReferences;
    private readonly pendingItemRefsDomain;
    private readonly pendingItemRefsRangeFinalized;
    private readonly pendingItemRefsRangeCollecting;
    private emittingReferencesItemScopeIdGenerator;
    constructor(options?: IMicrodataRdfParserOptions);
    /**
     * Parses the given text stream into a quad stream.
     * @param {NodeJS.EventEmitter} stream A text stream.
     * @return {RDF.Stream} A quad stream.
     */
    import(stream: EventEmitter): RDF.Stream;
    _transform(chunk: any, encoding: string, callback: (error?: Error | null, data?: any) => void): void;
    _flush(callback: (error?: Error | null, data?: any) => void): void;
    /**
     * Get the current item scope for the current depth.
     * This will skip all undefined item scopes.
     * @param parent If we should start looking one level higher in the stack.
     */
    protected getItemScope(parent?: boolean): IItemScope | undefined;
    /**
     * Get the current stack depth.
     */
    protected getDepth(): number;
    onTagOpen(name: string, attributes: Record<string, string>): void;
    onText(data: string): void;
    onTagClose(): void;
    onEnd(): void;
    /**
     * Initialize a new HtmlParser.
     * @param xmlMode If the parser should be setup in strict mode.
     */
    protected initializeParser(xmlMode: boolean): HtmlParser;
    /**
     * Handle the given item properties.
     * @param itempropValue The value of itemprop or itemprop-reverse.
     * @param reverse If the item properties are reversed (itemprop-reverse).
     * @param itemScope The current item scope.
     * @param tagName The current tag name.
     * @param tagAttributes The current tag attributes.
     */
    protected handleItemProperties(itempropValue: string, reverse: boolean, itemScope: IItemScope | undefined, tagName: string, tagAttributes: Record<string, string>): void;
    /**
     * Emit the given object for the given predicates.
     * @param itemScope The current item scope.
     * @param predicates An array of predicates.
     * @param object An object.
     * @param reverse If the triples should be reversed.
     */
    protected emitPredicateTriples(itemScope: IItemScope, predicates: RDF.NamedNode[], object: RDF.Quad_Object, reverse: boolean): void;
    /**
     * Emit the given triple to the stream.
     * @param {Quad_Subject} subject A subject term.
     * @param {Quad_Predicate} predicate A predicate term.
     * @param {Quad_Object} object An object term.
     */
    protected emitTriple(subject: RDF.Quad_Subject, predicate: RDF.Quad_Predicate, object: RDF.Quad_Object): void;
    /**
     * Attempt to emit all pending itemrefs for the given reference.
     * @param reference An item reference id.
     * @param itemScopeDomain An optional item scope. If defined, only refs from this scope will be emitted.
     */
    protected tryToEmitReferences(reference: string, itemScopeDomain?: IItemScope): void;
}
export interface IMicrodataRdfParserOptions {
    /**
     * A custom RDFJS DataFactory to construct terms and triples.
     */
    dataFactory?: RDF.DataFactory;
    /**
     * An initital default base IRI.
     */
    baseIRI?: string;
    /**
     * The default graph for constructing quads.
     */
    defaultGraph?: RDF.Quad_Graph;
    /**
     * An optional listener for the internal HTML parse events.
     */
    htmlParseListener?: IHtmlParseListener;
    /**
     * If the parser should assume strict X(HT)ML documents.
     */
    xmlMode?: boolean;
    /**
     * A vocabulary registry to define specific behaviour for given URI prefixes.
     */
    vocabRegistry?: IVocabRegistry;
}