class RuboCop::Cop::Performance::Caller
This cop identifies places where `caller` can be replaced by `caller(n..n).first`.
@example
# bad caller[1] caller.first caller_locations[1] caller_locations.first # good caller(2..2).first caller(1..1).first caller_locations(2..2).first caller_locations(1..1).first
Constants
- MSG
- RESTRICT_ON_SEND
Public Instance Methods
on_send(node)
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# File lib/rubocop/cop/performance/caller.rb, line 41 def on_send(node) return unless caller_with_scope_method?(node) method_name = node.receiver.method_name caller_arg = node.receiver.first_argument n = caller_arg ? int_value(caller_arg) : 1 if node.method?(:[]) m = int_value(node.first_argument) n += m end preferred_method = "#{method_name}(#{n}..#{n}).first" message = format(MSG, preferred_method: preferred_method, current_method: node.source) add_offense(node, message: message) do |corrector| corrector.replace(node, preferred_method) end end
Private Instance Methods
int_value(node)
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# File lib/rubocop/cop/performance/caller.rb, line 62 def int_value(node) node.children[0] end