Class: Mothership::Parser

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(command, given = {}) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/mothership/parser.rb', line 5

def initialize(command, given = {})
  @command = command
  @given = given
end

Instance Attribute Details

#given ⇒ Object (readonly)

Returns the value of attribute given.



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# File 'lib/mothership/parser.rb', line 3

def given
  @given
end

Instance Method Details

#parse_arguments(args) ⇒ Object

FOO
BAR

FIZZ BUZZ:

1 2 => :fizz => 1, :buzz => 2
1 2 3 => :foo => 1, :fizz => 2, :buzz => 3
1 2 3 4 => :foo => 1, :bar => 2, :fizz => 3, :buzz => 4

Raises:



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# File 'lib/mothership/parser.rb', line 93

def parse_arguments(args)
  total = @command.arguments.size
  required = 0
  optional = 0
  @command.arguments.each do |arg|
    case arg[:type]
    when :optional
      optional += 1
    when :splat
      break
    else
      required += 1
    end
  end

  parse_optionals = args.size - required

  @command.arguments.each do |arg|
    name = arg[:name]
    next if @given.key? name

    input = @command.inputs[name]

    case arg[:type]
    when :splat
      @given[name] = []

      until args.empty?
        @given[name] << args.shift
      end

    when :optional
      if parse_optionals > 0 && val = args.shift
        @given[name] = val
        parse_optionals -= 1
      end

    else
      if val = args.shift
        @given[name] = val
      elsif !input[:default] && !input[:interact]
        raise MissingArgument.new(@command, name)
      end
    end
  end

  raise ExtraArguments.new(@command, args) unless args.empty?
end

#parse_argv(argv) ⇒ Object 



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# File 'lib/mothership/parser.rb', line 10

def parse_argv(argv)
  args = parse_flags(argv.dup)

  parse_arguments(args)

  @given
end

#parse_flags(argv, find_in = nil) ⇒ Object 



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# File 'lib/mothership/parser.rb', line 18

def parse_flags(argv, find_in = nil)
  local = nil
  args = []

  until argv.empty?
    flag = normalize_flag(argv.shift, argv)

    name = local && local.flags[flag] || @command.flags[flag]
    unless name
      # assume first argument is subcommand
      if args.empty? && find_in && !local
        local = find_in[flag.gsub("-", "_").to_sym]
      end

      args << flag
      next
    end

    # skip flags defined by the local cmd
    if local && local.inputs[name]
      args << flag
      next
    end

    input = @command.inputs[name]

    if argv.first == "--ask"
      @given[name] = :interact
      argv.shift
      next
    end

    case input[:type]
    when :bool, :boolean
      if argv.first == "false" || argv.first == "true"
        @given[name] = argv.shift
      else
        @given[name] = "true"
      end
    when :float, :floating
      if !argv.empty? && argv.first =~ /^[0-9]+(\.[0-9]*)?$/
        @given[name] = argv.shift
      else
        raise TypeMismatch.new(@command, name, "floating")
      end
    when :integer, :number, :numeric
      if !argv.empty? && argv.first =~ /^[0-9]+$/
        @given[name] = argv.shift
      else
        raise TypeMismatch.new(@command, name, "numeric")
      end
    else
      arg =
        if argv.empty? || argv.first.start_with?("-")
          ""
        else
          argv.shift
        end

      @given[name] =
        if input[:argument] == :splat
          arg.split(",")
        else
          arg
        end
    end
  end

  args
end