Class: RuboCop::Cop::Performance::BindCall

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain: self, TargetRubyVersion, AutoCorrector, Base
Instance Chain: self, RangeHelp, Base
Inherits:	Base Object Base RuboCop::Cop::Performance::BindCall
Defined in:	lib/rubocop/cop/performance/bind_call.rb

Overview

In Ruby 2.7, UnboundMethod#bind_call has been added.

This cop identifies places where bind(obj).call(args, …) can be replaced by bind_call(obj, args, …).

The bind_call(obj, args, …) method is faster than bind(obj).call(args, …).

Examples:

# bad
umethod.bind(obj).call(foo, bar)
umethod.bind(obj).(foo, bar)

# good
umethod.bind_call(obj, foo, bar)

Constant Summary

MSG =
# File 'lib/rubocop/cop/performance/bind_call.rb', line 29

'Use `bind_call(%<bind_arg>s%<comma>s%<call_args>s)` instead of `bind(%<bind_arg>s).call(%<call_args>s)`.'

RESTRICT_ON_SEND =
# File 'lib/rubocop/cop/performance/bind_call.rb', line 30
```
%i[call].freeze
```

Instance Method Summary

#on_send(node)
#build_call_args(call_args_node) private
#correction_range(receiver, node) private
#message(bind_arg, call_args) private

Instance Method Details

#build_call_args(call_args_node) (private)

[ GitHub ]

# File 'lib/rubocop/cop/performance/bind_call.rb', line 71


def build_call_args(call_args_node)
  call_args_node.map(&:source).join(', ')
end

#correction_range(receiver, node) (private)

[ GitHub ]

# File 'lib/rubocop/cop/performance/bind_call.rb', line 64


def correction_range(receiver, node)
  location_of_bind = receiver.loc.selector.begin_pos
  location_of_call = node.source_range.end.end_pos

  range_between(location_of_bind, location_of_call)
end

#message(bind_arg, call_args) (private)

[ GitHub ]

# File 'lib/rubocop/cop/performance/bind_call.rb', line 58


def message(bind_arg, call_args)
  comma = call_args.empty? ? '' : ', '

  format(MSG, bind_arg: bind_arg, comma: comma, call_args: call_args)
end

#on_send(node)

[ GitHub ]

# File 'lib/rubocop/cop/performance/bind_call.rb', line 40


def on_send(node)
  return unless (receiver, bind_arg, call_args_node = bind_with_call_method?(node))

  range = correction_range(receiver, node)
  call_args = build_call_args(call_args_node)
  message = message(bind_arg.source, call_args)

  add_offense(range, message: message) do |corrector|
    call_args = ", #{call_args}" unless call_args.empty?

    replacement_method = "bind_call(#{bind_arg.source}#{call_args})"

    corrector.replace(range, replacement_method)
  end
end