Function declarationSourceWindow

src/resolution/frameworks/swift-objc.ts:157–164

* Read a small window of source ending at `node.startLine`, used to * inspect Swift attribute annotations attached to a declaration. Returns * an empty string if the source can't be read.

(node: Node, context: ResolutionContext)

 * an empty string if the source can't be read.
 */
function declarationSourceWindow(node: Node, context: ResolutionContext): string {
  const content = context.readFile(node.filePath);
  if (!content) return '';
  const lines = content.split(/\r?\n/);
  const startIdx = Math.max(0, node.startLine - 1 - SOURCE_PROBE_LINES);
  const endIdx = Math.min(lines.length, node.startLine);
  return lines.slice(startIdx, endIdx).join('\n');
}

/**
 * Try to resolve a Swift caller's bare reference to an ObjC implementation.