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# frozen_string_literal: true
require 'benchmark/memory/helpers'
require 'benchmark/memory/job/io_output/metric_formatter'
module Benchmark
module Memory
class Job
class IOOutput
# Format a comparison for use with the IOOutput.
class ComparisonFormatter
include Helpers
# Instantiate a formatter to output an comparison into an IO.
#
# @param comparison [Report::Comparison] The comparison to format.
def initialize(comparison)
@comparison = comparison
end
# @return [Report::Comparison] The comparison to format.
attr_reader :comparison
# Format comparison to a string to put on the output.
#
# @return [String]
def to_s
return '' unless comparison.possible?
output = StringIO.new
best, *rest = comparison.entries
rest = Array(rest)
add_best_summary(best, output)
rest.each do |entry|
add_comparison(entry, best, output)
end
output.string
end
private
def add_best_summary(best, output)
output << summary_message("%20s: %10i %s\n", best)
end
def add_comparison(entry, best, output)
output << summary_message('%20s: %10i %s - ', entry)
output << comparison_between(entry, best)
output << "\n"
end
def comparison_between(entry, best)
ratio = entry.compared_metric(comparison).to_f / best.compared_metric(comparison)
if ratio.abs > 1
format('%<ratio>.2fx more', ratio: ratio)
else
'same'
end
end
def summary_message(message, entry)
format(message, entry.label, entry.compared_metric(comparison), comparison.value)
end
end
end
end
end
end
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