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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Rails
# This cop checks that ActiveSupport aliases to core ruby methods
# are not used.
#
# @example
# # good
# 'some_string'.start_with?('prefix')
# 'some_string'.end_with?('suffix')
# [1, 2, 'a'] << 'b'
# [1, 2, 'a'].unshift('b')
#
# # bad
# 'some_string'.starts_with?('prefix')
# 'some_string'.ends_with?('suffix')
# [1, 2, 'a'].append('b')
# [1, 2, 'a'].prepend('b')
#
class ActiveSupportAliases < Cop
MSG = 'Use `%<prefer>s` instead of `%<current>s`.'.freeze
ALIASES = {
starts_with?: {
original: :start_with?, matcher: '(send str :starts_with? _)'
},
ends_with?: {
original: :end_with?, matcher: '(send str :ends_with? _)'
},
append: { original: :<<, matcher: '(send array :append _)' },
prepend: { original: :unshift, matcher: '(send array :prepend _)' }
}.freeze
ALIASES.each do |aliased_method, options|
def_node_matcher aliased_method, options[:matcher]
end
def on_send(node)
ALIASES.each_key do |aliased_method|
register_offense(node, aliased_method) if
public_send(aliased_method, node)
end
end
def autocorrect(node)
return false if append(node)
lambda do |corrector|
method_name = node.loc.selector.source
replacement = ALIASES[method_name.to_sym][:original]
corrector.replace(node.loc.selector, replacement.to_s)
end
end
private
def register_offense(node, method_name)
add_offense(
node,
message: format(MSG, prefer: ALIASES[method_name][:original],
current: method_name)
)
end
end
end
end
end
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