class RuboCop::Cop::Style::LambdaCall

This cop checks for use of the lambda.(args) syntax.

@example

# bad
lambda.(x, y)

# good
lambda.call(x, y)

Public Instance Methods

on_send(node) click to toggle source
# File lib/rubocop/cop/style/lambda_call.rb, line 17
def on_send(node)
  return unless node.receiver && node.method?(:call)

  if offense?(node)
    add_offense(node) { opposite_style_detected }
  else
    correct_style_detected
  end
end

Private Instance Methods

add_parentheses(node, corrector) click to toggle source
# File lib/rubocop/cop/style/lambda_call.rb, line 48
def add_parentheses(node, corrector)
  if node.arguments.empty?
    corrector.insert_after(node.source_range, '()')
  else
    corrector.replace(args_begin(node), '(')
    corrector.insert_after(args_end(node), ')')
  end
end
args_begin(node) click to toggle source
# File lib/rubocop/cop/style/lambda_call.rb, line 57
def args_begin(node)
  loc = node.loc
  selector =
    node.super_type? || node.yield_type? ? loc.keyword : loc.selector
  selector.end.resize(1)
end
args_end(node) click to toggle source
# File lib/rubocop/cop/style/lambda_call.rb, line 64
def args_end(node)
  node.loc.expression.end
end
autocorrect(node) click to toggle source
# File lib/rubocop/cop/style/lambda_call.rb, line 34
def autocorrect(node)
  lambda do |corrector|
    if explicit_style?
      receiver = node.receiver.source
      replacement = node.source.sub("#{receiver}.", "#{receiver}.call")

      corrector.replace(node.source_range, replacement)
    else
      add_parentheses(node, corrector) unless node.parenthesized?
      corrector.remove(node.loc.selector)
    end
  end
end
explicit_style?() click to toggle source
# File lib/rubocop/cop/style/lambda_call.rb, line 80
def explicit_style?
  style == :call
end
implicit_style?() click to toggle source
# File lib/rubocop/cop/style/lambda_call.rb, line 76
def implicit_style?
  style == :braces
end
message(_node) click to toggle source
# File lib/rubocop/cop/style/lambda_call.rb, line 68
def message(_node)
  if explicit_style?
    'Prefer the use of `lambda.call(...)` over `lambda.(...)`.'
  else
    'Prefer the use of `lambda.(...)` over `lambda.call(...)`.'
  end
end
offense?(node) click to toggle source
# File lib/rubocop/cop/style/lambda_call.rb, line 29
def offense?(node)
  explicit_style? && node.implicit_call? ||
    implicit_style? && !node.implicit_call?
end