Class: ClOptions

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

Instance Method Summary collapse

Constructor Details

#initialize(obj, options) ⇒ ClOptions

Returns a new instance of ClOptions.



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# File 'lib/cloptions.rb', line 2

def initialize(obj, options)
  @obj = obj
  @options = options
end

Instance Method Details

#handle(args) ⇒ Object 



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# File 'lib/cloptions.rb', line 73

def handle(args)
  @args = [ ]
  i = 0
  while i < args.length
    arg = args[i]
    found = nil
    if arg.class != String
      @args.concat args[i...args.length]
      break
    elsif arg == '--'
      @args.concat args[i+1...args.length]
      break
    elsif m = arg.match(/\A--([a-z]+(-[a-z]+)*)/)
      name, attached = parse_longname(arg, m)
      found = :long_name
    elsif arg[0] == '-' 
      name, attached  = parse_shortname(arg)
      found = :short_name
    else
      @args.concat args[i...args.length]
      break
    end
    if found
      next_arg = (i+1 < args.length) ? args[i+1] : nil
      begin
        need_shift = handle_option found, name, attached, next_arg 
        if need_shift.class == String
          errmsg = need_shift
          return errmsg + ": " + arg.to_s
        end
      end
      i += 1 if need_shift == true
    end
    i += 1
  end
  @args
end

#handle_option(type, name, attached, nextarg) ⇒ Object 



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# File 'lib/cloptions.rb', line 21

def handle_option(type, name, attached, nextarg)
  need_shift = false
  valid_option = false
  value = attached.nil? ? nextarg : attached
  @options.each { |option|
    if option[type] == name
      valid_option = true
      if option[:takes_value]
        need_shift = attached.nil?
        if value
          validate(value, option)
          @obj.send(option[:method], value)
        else
          return "value required for option"
        end
      else
        if attached.nil?
          @obj.send(option[:method])
        else
          return "Invalid option"
        end
      end
      break
    end
  }
  return "Invalid option" unless valid_option 
  need_shift
end

#parse_longname(arg, m) ⇒ Object 



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# File 'lib/cloptions.rb', line 50

def parse_longname(arg, m)
  long_name = arg[m.begin(1)...m.end(1)]
  option_value = nil
  if arg[m.end(1)] == '='
    option_value = arg[m.end(1)+1...arg.length]
  end
  return long_name, option_value
end

#parse_shortname(arg) ⇒ Object 



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# File 'lib/cloptions.rb', line 59

def parse_shortname (arg)
  short_name = if arg.length > 1
                 arg[1]
               else
                 raise "no option given"
               end
  option_value = if arg.length > 2 
                   arg[2...arg.length]
                 else
                   nil
                 end
  return short_name, option_value
end

#validate(value, option) ⇒ Object 



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# File 'lib/cloptions.rb', line 7

def validate(value, option)
  validator = option[:takes_value]
  vclass = validator.class
  if vclass == Regexp
    if not value.full_match(validator)
      raise "Invalid format for option --#{option[:long_name]}"
    end
  elsif vclass == Array
    if not validator.include? value
      raise "Invalid choice for option --#{option[:long_name]}, must be one of #{validator}"
    end
  end
end