class PowerAssert::Context

def initialize(base_caller_length)
  @fired = false
  @target_thread = Thread.current
  method_id_set = nil
  @return_values = []
  @trace_return = TracePoint.new(:return, :c_return) do |tp|
    unless method_id_set
      next unless Thread.current == @target_thread
      method_id_set = @parser.method_id_set
    end
    method_id = tp.callee_id
    next if ! method_id_set[method_id]
    next if tp.event == :c_return and
            not (@parser.lineno == tp.lineno and @parser.path == tp.path)
    locs = PowerAssert.app_caller_locations
    diff = locs.length - base_caller_length
    if (tp.event == :c_return && diff == 1 || tp.event == :return && diff <= 2) and Thread.current == @target_thread
      idx = -(base_caller_length + 1)
      if @parser.path == locs[idx].path and @parser.lineno == locs[idx].lineno
        val = PowerAssert.configuration.lazy_inspection ?
          tp.return_value :
          InspectedValue.new(SafeInspectable.new(tp.return_value).inspect)
        @return_values << Value[method_id.to_s, val, locs[idx].lineno, nil]
      end
    end
  rescue Exception => e
    warn "power_assert: [BUG] Failed to trace: #{e.class}: #{e.message}"
    if e.respond_to?(:full_message)
      warn e.full_message.gsub(/^/, 'power_assert:     ')
    end
  end
end