def container_context()

in bindings/scripts/v8_union.py [0:0]

• 80 lines of code
• 25 McCabe index (conditional complexity)

def container_context(union_type, info_provider):
    cpp_includes.clear()
    header_forward_decls.clear()
    header_includes.clear()
    cpp_includes.update(UNION_CPP_INCLUDES)
    header_includes.update(UNION_H_INCLUDES)
    members = []

    # These variables refer to member contexts if the given union type has
    # corresponding types. They are used for V8 -> impl conversion.
    array_buffer_type = None
    array_buffer_view_type = None
    array_or_sequence_type = None
    boolean_type = None
    dictionary_type = None
    interface_types = []
    numeric_type = None
    object_type = None
    record_type = None
    string_type = None
    for member in sorted(union_type.flattened_member_types, key=lambda m: m.name):
        context = member_context(member, info_provider)
        members.append(context)
        if member.base_type == 'ArrayBuffer':
            if array_buffer_type:
                raise Exception('%s is ambiguous.' % union_type.name)
            array_buffer_type = context
        elif member.base_type == 'ArrayBufferView':
            if array_buffer_view_type:
                raise Exception('%s is ambiguous.' % union_type.name)
            array_buffer_view_type = context
        elif member.is_dictionary:
            if dictionary_type:
                raise Exception('%s is ambiguous.' % union_type.name)
            dictionary_type = context
        elif member.is_array_or_sequence_type:
            if array_or_sequence_type:
                raise Exception('%s is ambiguous.' % union_type.name)
            array_or_sequence_type = context
        # "Dictionary" is an object, rather than an IDL dictionary.
        elif member.base_type == 'Dictionary':
            if object_type or record_type:
                raise Exception('%s is ambiguous.' % union_type.name)
            object_type = context
        elif member.is_record_type:
            if object_type or record_type:
                raise Exception('%s is ambiguous.' % union_type.name)
            record_type = context
        elif member.is_interface_type:
            interface_types.append(context)
        elif member is union_type.boolean_member_type:
            boolean_type = context
        elif member is union_type.numeric_member_type:
            numeric_type = context
        elif member is union_type.string_member_type:
            string_type = context
        else:
            raise Exception('%s is not supported as an union member.' % member.name)

    # Nullable restriction checks
    nullable_members = union_type.number_of_nullable_member_types
    if nullable_members > 1:
        raise Exception('%s contains more than one nullable members' % union_type.name)
    if dictionary_type and nullable_members == 1:
        raise Exception('%s has a dictionary and a nullable member' % union_type.name)

    cpp_class = union_type.cpp_type
    return {
        'array_buffer_type': array_buffer_type,
        'array_buffer_view_type': array_buffer_view_type,
        'array_or_sequence_type': array_or_sequence_type,
        'boolean_type': boolean_type,
        'cpp_class': cpp_class,
        'cpp_includes': sorted(cpp_includes),
        'dictionary_type': dictionary_type,
        'header_includes': sorted(header_includes),
        'header_forward_decls': sorted(header_forward_decls),
        'includes_nullable_type': union_type.includes_nullable_type,
        'interface_types': interface_types,
        'members': members,
        'numeric_type': numeric_type,
        'object_type': object_type,
        'record_type': record_type,
        'string_type': string_type,
        'type_string': str(union_type),
        'v8_class': v8_types.v8_type(cpp_class),
    }