Function parseNumberOrPercent

src/ChartGPU.ts:391–407

(value: number | string, basis: number)

type HitTestMatch = CartesianHitTestMatch | PieHitTestMatch | CandlestickHitTestMatch;

const parseNumberOrPercent = (value: number | string, basis: number): number | null => {
  if (typeof value === 'number') return Number.isFinite(value) ? value : null;
  if (typeof value !== 'string') return null;

  const s = value.trim();
  if (s.length === 0) return null;

  if (s.endsWith('%')) {
    const pct = Number.parseFloat(s.slice(0, -1));
    if (!Number.isFinite(pct)) return null;
    return (pct / 100) * basis;
  }

  // Be permissive: allow numeric strings like "120" even though the public type primarily documents percent strings.
  const n = Number.parseFloat(s);
  return Number.isFinite(n) ? n : null;
};

const resolvePieCenterPlotCss = (
  center: PieCenter | undefined,