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# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# Checks uses of lambda without a literal block.
# It emulates the following warning in Ruby 3.0:
#
# % ruby -vwe 'lambda(&proc {})'
# ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin19]
# -e:1: warning: lambda without a literal block is deprecated; use the proc without
# lambda instead
#
# This way, proc object is never converted to lambda.
# Autocorrection replaces with compatible proc argument.
#
# @example
#
# # bad
# lambda(&proc { do_something })
# lambda(&Proc.new { do_something })
#
# # good
# proc { do_something }
# Proc.new { do_something }
# lambda { do_something } # If you use lambda.
#
class LambdaWithoutLiteralBlock < Base
extend AutoCorrector
MSG = 'lambda without a literal block is deprecated; use the proc without lambda instead.'
RESTRICT_ON_SEND = %i[lambda].freeze
# @!method lambda_with_symbol_proc?(node)
def_node_matcher :lambda_with_symbol_proc?, <<~PATTERN
(send nil? :lambda (block_pass (sym _)))
PATTERN
def on_send(node)
if node.parent&.block_type? || !node.first_argument || lambda_with_symbol_proc?(node)
return
end
add_offense(node) do |corrector|
corrector.replace(node, node.first_argument.source.delete('&'))
end
end
end
end
end
end
Version data entries
45 entries across 41 versions & 6 rubygems