getCodecClasses function

Iterable<EnumeratedClass> getCodecClasses(Api api, Root root)

Given an Api, return the enumerated classes that must exist in the codec where the enumeration should be the key used in the buffer.

Implementation

Iterable<EnumeratedClass> getCodecClasses(Api api, Root root) sync* {
  final Set<String> enumNames = root.enums.map((Enum e) => e.name).toSet();
  final Map<TypeDeclaration, List<int>> referencedTypes =
      getReferencedTypes(<Api>[api], root.classes);
  final Iterable<String> allTypeNames =
      referencedTypes.keys.any(_isConcreteTypeAmbiguous)
          ? root.classes.map((Class aClass) => aClass.name)
          : referencedTypes.keys.map((TypeDeclaration e) => e.baseName);
  final List<String> sortedNames = allTypeNames
      .where((String element) =>
          element != 'void' &&
          !validTypes.contains(element) &&
          !enumNames.contains(element))
      .toList();
  sortedNames.sort();
  int enumeration = _minimumCodecFieldKey;
  const int maxCustomClassesPerApi = 255 - _minimumCodecFieldKey;
  if (sortedNames.length > maxCustomClassesPerApi) {
    throw Exception(
        "Pigeon doesn't support more than $maxCustomClassesPerApi referenced custom classes per API, try splitting up your APIs.");
  }
  for (final String name in sortedNames) {
    yield EnumeratedClass(name, enumeration);
    enumeration += 1;
  }
}