pg-rdf-to-json/dist/formatters/mergeMarcField.js

Transforms RDF files from rdf-files.tar.bz2 provided by Project Gutenberg into JS/JSON objects.

const sharedMarc = new WeakMap();
const marcMatcher = /^marc(?<id>\d{3})$/;
export default function mergeMarcField(key, value, path, original) {
    const matches = marcMatcher.exec(key);
    if (!matches || !matches.groups) {
        throw new Error(`Expected field to start with "marc". Got "${key}"`);
    }
    const marcFields = sharedMarc.get(original);
    if (!marcFields) {
        sharedMarc.set(original, { [matches.groups.id]: value });
    }
    else {
        marcFields[matches.groups.id] = value;
    }
    return value;
}
export function postProcessMarcFields(newObject, original) {
    const marcFields = sharedMarc.get(original);
    if (marcFields) {
        newObject.rdf.ebook.marc = marcFields;
        for (const key of Object.keys(marcFields)) {
            delete newObject.rdf.ebook[`marc${key}`];
        }
        sharedMarc.delete(original);
    }
    else {
        newObject.rdf.ebook.marc = {};
    }
}
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