class RuboCop::AST::ProcessedSource

def create_parser(ruby_version, parser_engine, prism_result)
  builder = builder_class(parser_engine).new
  parser_class = parser_class(ruby_version, parser_engine)
  parser_instance = if prism_result
                      # NOTE: Since it is intended for use with Ruby LSP, it targets only Prism.
                      # If there is no reuse of a pre-parsed result, such as in Ruby LSP,
                      # regular parsing with Prism occurs, and `else` branch will be executed.
                      prism_reparsed = PrismPreparsed.new(prism_result)
                      parser_class.new(builder, parser: prism_reparsed)
                    else
                      parser_class.new(builder)
                    end
  parser_instance.tap do |parser|
    # On JRuby there's a risk that we hang in tokenize() if we
    # don't set the all errors as fatal flag. The problem is caused by a bug
    # in Racc that is discussed in issue #93 of the whitequark/parser
    # project on GitHub.
    parser.diagnostics.all_errors_are_fatal = (RUBY_ENGINE != 'ruby')
    parser.diagnostics.ignore_warnings = false
    parser.diagnostics.consumer = lambda do |diagnostic|
      @diagnostics << diagnostic
    end
  end
end