shelving/extract/Extractor.js

Toolkit for using data in JavaScript.

import { mergeElements } from "../util/element.js";
/**
 * Base class for an extractor that converts input into a tree element.
 * - Extractors are composable: outer extractors delegate to inner extractors.
 * - The output type is always a `TreeElement` (or a more specific subtype).
 */
export class Extractor {
}
export function mergeTreeElements(primary, secondary) {
    return {
        ...primary,
        type: primary.type,
        key: primary.key,
        props: {
            ...primary.props,
            title: primary.props.title ?? secondary.props.title,
            description: primary.props.description ?? secondary.props.description,
            content: _mergeContent(primary.props.content, secondary.props.content),
            children: mergeElements(primary.props.children, secondary.props.children),
        },
    };
}
/** Merge two markup content strings — primary first, secondary appended after a blank line. Returns `undefined` if both are empty. */
function _mergeContent(a, b) {
    if (!a)
        return b;
    if (!b)
        return a;
    return `${a}\n\n${b}`;
}