stripSharedSwiftPreamble function

String stripSharedSwiftPreamble(String content)

Strips the shared public-type preamble from a Swift bridge file.

When multiple specs compile into the same Swift module each generated .bridge.g.swift file starts with shared declarations (NitroEncodable, NitroNullableInt, NitroRecordWriter, …). Keeping those in 2nd+ files causes an invalid redeclaration Swift compiler error. This function removes everything from the public protocol NitroEncodable line up to (but not including) the /** doc-comment that begins the spec-specific protocol, leaving only the file-private string helpers and the spec-specific protocol/registry/stubs.

Implementation

String stripSharedSwiftPreamble(String content) {
  final lines = content.split('\n');
  final result = <String>[];
  var inSharedBlock = false;

  for (final line in lines) {
    if (!inSharedBlock && line.startsWith('public protocol NitroEncodable')) {
      inSharedBlock = true;
      continue;
    }
    if (inSharedBlock) {
      if (line.startsWith('/**')) {
        inSharedBlock = false;
        result.add(line);
      }
      continue;
    }
    result.add(line);
  }

  return result.join('\n');
}