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neon
d719c4ee5b
Carry ISBN-10 and ISBN-13 independently from accepted providers through Auto-fill previews, saves and background refreshes. Preserve existing identifiers and field locks, validate provider checksums and avoid combining different editions. Classify embedded ISBNs correctly and support ISBN-10 fallback in search, Book Dock confidence and file naming.
54 lines
1.9 KiB
TypeScript
54 lines
1.9 KiB
TypeScript
import { isValidIsbn10, isValidIsbn13, normalizeIsbn } from '../../../common/text-match/isbn-normalize';
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export interface IsbnHit {
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value: string;
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kind: 10 | 13;
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labeled: boolean;
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}
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const LABEL_LOOKBACK = 25;
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export { isValidIsbn10, isValidIsbn13, normalizeIsbn };
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/**
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* Find checksum-valid ISBN-10/13 strings inside free text. Each hit records whether
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* an "ISBN" label sits just before it. De-duplicates by value, upgrading to labeled
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* if any occurrence of the same value was labeled.
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*/
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export function findIsbnInText(text: string): IsbnHit[] {
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const candidate = /[0-9][0-9\s-]{7,16}[0-9Xx]/g;
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const byValue = new Map<string, IsbnHit>();
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for (const match of text.matchAll(candidate)) {
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const norm = normalizeIsbn(match[0]);
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let kind: 10 | 13 | null = null;
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if (norm.length === 13 && isValidIsbn13(norm)) kind = 13;
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else if (norm.length === 10 && isValidIsbn10(norm)) kind = 10;
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if (kind === null) continue;
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const idx = match.index ?? 0;
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const before = text.slice(Math.max(0, idx - LABEL_LOOKBACK), idx).toLowerCase();
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const labeled = before.includes('isbn');
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const existing = byValue.get(norm);
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if (!existing) byValue.set(norm, { value: norm, kind, labeled });
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else if (labeled && !existing.labeled) existing.labeled = true;
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}
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return [...byValue.values()];
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}
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/**
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* Pick the most trustworthy ISBN from a set of hits. Only labeled hits are eligible
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* (precision); prefers ISBN-13 over ISBN-10. Returns a single form, mirroring the
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* OPF parser's parseIsbn (no ISBN-10 -> 13 conversion).
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*/
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export function pickBestIsbn(hits: IsbnHit[]): { isbn10: string | null; isbn13: string | null } {
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const labeled = hits.filter((h) => h.labeled);
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const best13 = labeled.find((h) => h.kind === 13);
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if (best13) return { isbn10: null, isbn13: best13.value };
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const best10 = labeled.find((h) => h.kind === 10);
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if (best10) return { isbn10: best10.value, isbn13: null };
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return { isbn10: null, isbn13: null };
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}
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