Function swiftBaseNamesForObjcSelector

src/resolution/swift-objc-bridge.ts:196–243

(selector: string)

 * `_` first label). The resolver tries each.
 */
export function swiftBaseNamesForObjcSelector(selector: string): string[] {
  if (!selector) return [];

  // Strip trailing colons and split into keywords.
  const keywords = selector.replace(/:+$/g, '').split(':');
  const firstKeyword = keywords[0];
  if (!firstKeyword) return [];

  const candidates: Set<string> = new Set();

  // Always a candidate: the raw first keyword. Covers
  //   `play:`           → `play`
  //   `play:by:`        → `play`
  //   `playWithSong:`   → `playWithSong` (a literal Swift name)
  //   `tableView:...:`  → `tableView`
  candidates.add(firstKeyword);

  // `initWith<X>:` and `initWith<X>:<more>:` always reduce to `init`.
  if (firstKeyword.startsWith('initWith')) {
    candidates.add('init');
  }

  // Preposition-prefix patterns: `<base>(With|For|By|In|On|At|From|To|Of|As)<Cap>:`
  // covers both Swift's @objc EXPORT rule (always "With") and Cocoa's
  // IMPORTED selectors which use other prepositions natively (e.g.
  // `objectForKey:`, `stringWithFormat:`, `compareTo:`,
  // `imageNamed:inBundle:`). Strip to recover the Swift base name a caller
  // would use (e.g. `object`, `string`, `compare`, `image`).
  const prepositionMatch = firstKeyword.match(
    /^([a-z][a-zA-Z0-9]*?)(?:With|For|By|In|On|At|From|To|Of|As)[A-Z]/
  );
  if (prepositionMatch && prepositionMatch[1]) {
    candidates.add(prepositionMatch[1]);
  }

  // `setX:` could be a property setter — the Swift property is `x` (lowercase).
  // Only fires for the obvious shape: `set` + capital letter + ':' (one param).
  if (
    keywords.length === 1 &&
    /^set[A-Z]/.test(firstKeyword) &&
    selector.endsWith(':')
  ) {
    const propName = lowerFirst(firstKeyword.slice(3));
    if (propName) candidates.add(propName);
  }

  return Array.from(candidates);
}

/**
 * Detect whether a Swift method `@objc` declaration uses the `@objc(custom:)`