Function objcSelectorForSwiftMethod

src/resolution/swift-objc-bridge.ts:76–100

(
  baseName: string,
  externalLabels: (string | null)[],
  explicitObjcName?: string | null
)

 * Initializer rules are handled by `objcSelectorForSwiftInit`.
 */
export function objcSelectorForSwiftMethod(
  baseName: string,
  externalLabels: (string | null)[],
  explicitObjcName?: string | null
): string | null {
  if (!baseName) return null;
  if (explicitObjcName) return explicitObjcName;

  if (externalLabels.length === 0) {
    return baseName;
  }

  const [first, ...rest] = externalLabels;
  // Single param: "_" → "base:" ; "label" → "baseWithLabel:"
  // Multi-param mirrors the same first-keyword formation, then appends each
  // subsequent label as its own keyword. A `null` later label is invalid
  // ObjC (no way to express unlabeled middle params) — keep as `:` to be safe.
  const firstKeyword =
    first === null || first === undefined || first === '_' || first === ''
      ? `${baseName}:`
      : `${baseName}With${capFirst(first)}:`;

  const restKeywords = rest.map((l) => `${l ?? ''}:`).join('');
  return firstKeyword + restKeywords;
}

/**
 * Compute the bridged ObjC selector for a Swift `init(...)` declaration.