Function patternToSegments

packages/fresh/src/router.ts:300–333

(
  path: string,
  root: string,
  includeLast: boolean = false,
)

}

export function patternToSegments(
  path: string,
  root: string,
  includeLast: boolean = false,
): string[] {
  const out: string[] = [root];

  if (path === "/" || path === "*" || path === "/*") return out;

  // Strip optional groups like {/:param}? before segmenting, so that
  // /api{/:opt}?/endpoint produces the same segments as /api/endpoint.
  // This ensures middleware registered at /api applies to routes with
  // optional parameters under /api.
  const cleaned = path.replace(/\{[^}]*\}\??/g, "");

  let start = -1;
  for (let i = 0; i < cleaned.length; i++) {
    const ch = cleaned[i];

    if (ch === "/") {
      if (i > 0) {
        const raw = cleaned.slice(start + 1, i);
        out.push(raw);
      }
      start = i;
    }
  }

  if (includeLast && start < cleaned.length - 1) {
    out.push(cleaned.slice(start + 1));
  }

  return out;
}

export function mergePath(
  basePath: string,