class RuboCop::Cop::Style::SingleLineBlockParams

parameters.
For instance one can configure ‘reduce`(`inject`) to use |a, e| as
method accepting a block match the names specified via configuration.
This cop checks whether the block parameters of a single-line

def args_match?(method_name, args) 

def args_match?(method_name, args)
  actual_args = args.to_a.flat_map(&:to_a)
  # Prepending an underscore to mark an unused parameter is allowed, so
  # we remove any leading underscores before comparing.
  actual_args_no_underscores = actual_args.map do |arg|
    arg.to_s.sub(/^_+/, '')
  end
  actual_args_no_underscores == target_args(method_name)
end

def eligible_arguments?(node) 

def eligible_arguments?(node)
  node.arguments? && node.arguments.to_a.all?(&:arg_type?)
end

def eligible_method?(node) 

def eligible_method?(node)
  node.send_node.receiver &&
    method_names.include?(node.send_node.method_name)
end

def message(node) 

def message(node)
  method_name = node.parent.send_node.method_name
  arguments   = target_args(method_name).join(', ')
  format(MSG, method_name, arguments)
end

def method_name(method) 

def method_name(method)
  method.keys.first
end

def method_names 

def method_names
  methods.map { |method| method_name(method).to_sym }
end

def methods 

def methods
  cop_config['Methods']
end

def on_block(node) 

def on_block(node)
  return unless node.single_line?
  return unless eligible_method?(node)
  return unless eligible_arguments?(node)
  return if args_match?(node.send_node.method_name, node.arguments)
  add_offense(node.arguments)
end

def target_args(method_name) 

def target_args(method_name)
  method_name = method_name.to_s
  method_hash = methods.find { |m| method_name(m) == method_name }
  method_hash[method_name]
end