class RuboCop::Cop::Style::UnpackFirst
Checks for accessing the first element of `String#unpack` which can be replaced with the shorter method `unpack1`.
@example
# bad 'foo'.unpack('h*').first 'foo'.unpack('h*')[0] 'foo'.unpack('h*').slice(0) 'foo'.unpack('h*').at(0) # good 'foo'.unpack1('h*')
Constants
- MSG
- RESTRICT_ON_SEND
Public Instance Methods
on_send(node)
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# File lib/rubocop/cop/style/unpack_first.rb, line 38 def on_send(node) unpack_and_first_element?(node) do |unpack_call, unpack_arg| range = first_element_range(node, unpack_call) message = format(MSG, receiver: unpack_call.receiver.source, format: unpack_arg.source, method: range.source) add_offense(node, message: message) do |corrector| corrector.remove(first_element_range(node, unpack_call)) corrector.replace(unpack_call.loc.selector, 'unpack1') end end end
Private Instance Methods
first_element_range(node, unpack_call)
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# File lib/rubocop/cop/style/unpack_first.rb, line 54 def first_element_range(node, unpack_call) Parser::Source::Range.new(node.loc.expression.source_buffer, unpack_call.loc.expression.end_pos, node.loc.expression.end_pos) end