shelving/extract/ThroughExtractor.js

Toolkit for using data in JavaScript.

import { Extractor } from "./Extractor.js";
/**
 * Base class for an extractor that wraps another extractor.
 * - Subclasses delegate to `source` and (optionally) transform the input before or the output after.
 * - Composes the same way `Through*Provider` chains do — chain multiple `ThroughExtractor`s to build up behaviour.
 */
export class ThroughExtractor extends Extractor {
    source;
    constructor(source) {
        super();
        this.source = source;
    }
    /** Default implementation forwards to `source.extract()`. Subclasses override to do work before or after. */
    extract(input) {
        return this.source.extract(input);
    }
}