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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# This cop looks for use of the same name as outer local variables
# for block arguments or block local variables.
# This is a mimic of the warning
# "shadowing outer local variable - foo" from `ruby -cw`.
#
# @example
#
# # bad
#
# def some_method
# foo = 1
#
# 2.times do |foo| # shadowing outer `foo`
# do_something(foo)
# end
# end
#
# @example
#
# # good
#
# def some_method
# foo = 1
#
# 2.times do |bar|
# do_something(bar)
# end
# end
class ShadowingOuterLocalVariable < Cop
MSG = 'Shadowing outer local variable - `%<variable>s`.'.freeze
def join_force?(force_class)
force_class == VariableForce
end
def before_declaring_variable(variable, variable_table)
return if variable.should_be_unused?
outer_local_variable = variable_table.find_variable(variable.name)
return unless outer_local_variable
message = format(MSG, variable: variable.name)
add_offense(variable.declaration_node, message: message)
end
end
end
end
end
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