Class: KnapsackSolver::CliOptionParser

Inherits:
Object
  • Object
show all
Defined in:
lib/knapsack_solver/cli_option_parser.rb

Overview

This class parses command line arguments provided to the knapsack_solver binary.

Constant Summary collapse

USAGE_MESSAGE =

Message that describes how to use this CLI utility.

'Usage: knapsack_solver OPTIONS DATASET_FILE...'.freeze

Class Method Summary collapse

Class Method Details

.parse(arguments) ⇒ Hash

Parses command-line arguments and removes them from the array of arguments.

rubocop:disable Metrics/AbcSize, Metric/MethodLength, Metric/BlockLength

Parameters:

  • arguments (Array) —

    the command-line arguments.

Returns:

  • (Hash) —

    hash of recognized options.



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# File 'lib/knapsack_solver/cli_option_parser.rb', line 18

def self.parse(arguments)
  options = {}
  parser = OptionParser.new do |opts|
    opts.banner = USAGE_MESSAGE
    opts.on('-b', '--branch-and-bound', 'Use branch and boung method of solving') do
      options[:branch_and_bound] = true
    end
    opts.on('-d', '--dynamic-programming', 'Use dynamic programming for solving') do
      options[:dynamic_programming] = true
    end
    opts.on('-f', '--fptas', 'Use FPTAS for solving') do
      options[:fptas] = true
    end
    opts.on('-r', '--heuristic', 'Use brute force method of solving') do
      options[:heuristic] = true
    end
    opts.on('-e', '--fptas-epsilon EPS', 'Relative error for FPTAS from range (0,1)') do |eps|
      options[:fptas_epsilon] = eps
    end
    opts.on('-o', '--output DIR', 'Directory for output log files') do |dir|
      options[:output_dir] = dir
    end
    opts.on('-g', '--graphs DIR', 'Directory for graphs') do |dir|
      options[:graphs_dir] = dir
    end
    opts.on('-v', '--version', 'Show program version') do
      options[:version] = true
    end
    opts.on_tail('-h', '--help', 'Show this help message') do
      options[:help] = true
    end
  end
  parser.parse!(arguments)
  process_help_and_version_opts(options, arguments, parser.to_s)
end

.process_help_and_version_opts(options, arguments, usage_msg) ⇒ Object

rubocop:enable Metrics/AbcSize, Metric/MethodLength, Metric/BlockLength



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# File 'lib/knapsack_solver/cli_option_parser.rb', line 55

def self.process_help_and_version_opts(options, arguments, usage_msg)
  if !options[:help] && !options[:version]
    CliOptionChecker.check(options, arguments)
    return options
  end
  if options[:help]
    puts usage_msg
  elsif options[:version]
    puts "knapsack_solver #{KnapsackSolver::VERSION}"
  end
  nil
end