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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# This cop checks for variable interpolation (like "#@ivar").
#
# @example
# # bad
# "His name is #$name"
# /check #$pattern/
# "Let's go to the #@store"
#
# # good
# "His name is #{$name}"
# /check #{$pattern}/
# "Let's go to the #{@store}"
class VariableInterpolation < Cop
MSG = 'Replace interpolated variable `%<variable>s` ' \
'with expression `#{%<variable>s}`.'.freeze
def on_dstr(node)
check_for_interpolation(node)
end
def on_regexp(node)
check_for_interpolation(node)
end
def on_xstr(node)
check_for_interpolation(node)
end
def autocorrect(node)
lambda do |corrector|
corrector.replace(node.source_range, "{#{node.source}}")
end
end
private
def check_for_interpolation(node)
var_nodes(node.children).each do |var_node|
add_offense(var_node)
end
end
def message(node)
format(MSG, variable: node.source)
end
def var_nodes(nodes)
nodes.select { |n| n.variable? || n.reference? }
end
end
end
end
end
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