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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# This cop checks for colons and commas in %i, e.g. `%i(:foo, :bar)`
#
# It is more likely that the additional characters are unintended (for
# example, mistranslating an array of literals to percent string notation)
# rather than meant to be part of the resulting symbols.
#
# @example
#
# # bad
#
# %i(:foo, :bar)
#
# @example
#
# # good
#
# %i(foo bar)
class PercentSymbolArray < Cop
include PercentLiteral
MSG = "Within `%i`/`%I`, ':' and ',' are unnecessary and may be " \
'unwanted in the resulting symbols.'.freeze
def on_array(node)
process(node, '%i', '%I')
end
def on_percent_literal(node)
return unless contains_colons_or_commas?(node)
add_offense(node)
end
def autocorrect(node)
lambda do |corrector|
node.children.each do |child|
range = child.loc.expression
corrector.remove_trailing(range, 1) if range.source.end_with?(',')
corrector.remove_leading(range, 1) if
range.source.start_with?(':')
end
end
end
private
def contains_colons_or_commas?(node)
node.children.any? do |child|
literal = child.children.first.to_s
next if non_alphanumeric_literal?(literal)
literal.start_with?(':') || literal.end_with?(',')
end
end
def non_alphanumeric_literal?(literal)
literal !~ /[[:alnum:]]/
end
end
end
end
end
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