@sroussey/parse-address/dist/maps/_eu/localityChain.js

International street address parser for 220 jurisdictions (US, CA + 218 countries and territories), with SEC EDGAR country-code resolution

// Shared `postNormalize` helper for the many countries whose grammar captures a
// whole locality chain in the single `city` slot ("Suburb, District, City").
//
// The routing city is the LAST locality; everything before it is a
// neighbourhood/sector/area with no output field of its own. Those earlier
// values are reported through `__dropped` so the token-preservation guard does
// not score them as lost street tokens.
//
// Without this helper the same eight lines were copy-pasted verbatim into ~30
// country configs (plus five that only prepend a number-label word), so a fix
// to the drop bookkeeping had to be made in thirty places.
/**
 * Collapse a comma-separated locality chain in `parsed.city` down to its last
 * element and record the earlier ones as dropped.
 *
 * @param parsed  the in-progress parse result, mutated in place
 * @param labels  number-label words the grammar consumes but never emits
 *                ("Plot", "House"); always reported as dropped
 */
export function keepLastLocality(parsed, labels = []) {
    const dropped = [...labels];
    if (typeof parsed.city === "string" && parsed.city.includes(",")) {
        const parts = parsed.city
            .split(",")
            .map((s) => s.trim())
            .filter(Boolean);
        if (parts.length) {
            parsed.city = parts[parts.length - 1];
            dropped.push(...parts.slice(0, -1));
        }
    }
    if (dropped.length)
        parsed.__dropped = dropped;
}
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