Function extractGhs

export function extractGhs(data: unknown): PubChemGhs | undefined {
  const pictograms = new Map<string, { code: string; label: string; url: string }>();
  const statements = new Set<string>();
  let signal: string | undefined;

  for (const entry of collectInformation(data)) {
    const name = Reflect.get(entry, 'Name');
    for (const { text, markup } of markupItems(entry)) {
      if (name === 'Pictogram(s)') {
        for (const mark of markup) {
          const url = Reflect.get(mark, 'URL');
          const label = Reflect.get(mark, 'Extra');
          const code = typeof url === 'string' ? /(GHS\d{2})\.svg$/.exec(url)?.[1] : undefined;
          if (code !== undefined && typeof url === 'string') {
            pictograms.set(code, { code, label: typeof label === 'string' ? label : code, url });
          }
        }
      } else if (name === 'Signal') {
        signal ??= text.trim() || undefined;
      } else if (name === 'GHS Hazard Statements') {
        const statement = text.replace(/\s*\[.*\]\s*$/, '').trim();
        if (statement !== '') statements.add(statement);
      }
    }
  }

  if (pictograms.size === 0 && signal === undefined && statements.size === 0) return undefined;
  return {
    pictograms: [...pictograms.values()].sort((a, b) => a.code.localeCompare(b.code)),
    signal,
    hazardStatements: [...statements],
  };
}
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