Class: Alf::Algebra::Signature

Inherits:
Object
  • Object
show all
Defined in:
lib/alf/shell/ext/signature.rb

Instance Method Summary collapse

Instance Method Details

#argv2args(argv) ⇒ Object

Converts commandline arguments to operator constructor arguments



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# File 'lib/alf/shell/ext/signature.rb', line 6

def argv2args(argv)
  # First split over --
  argv = Quickl.split_commandline_args(argv)

  # Parse the options and replace argv[0] by remaining arguments
  opts = {}
  argv[0] = option_parser(opts).parse!(argv[0])
  opts = default_options.merge(opts)

  # Operands are argv[0], and can be removed
  oper = argv.shift

  # Coerce each remaining argument according to the signature
  args = []
  with_each_arg(argv) do |name,dom,value|
    invalid_args!(args) if value.nil?
    args << Shell.from_argv(Array(value), dom)
  end

  [oper, args, opts]
end

#to_shell ⇒ Object

Returns a shell synopsis for this signature.

Example:

Alf::Algebra::Project.signature.to_shell
# => "alf project [--allbut] [OPERAND] -- ATTRIBUTES"



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# File 'lib/alf/shell/ext/signature.rb', line 34

def to_shell
  oper = operator.nullary? ? "" :
        (operator.unary? ? "[OPERAND]" : "[LEFT] RIGHT")
  opts =   options.map{|opt|   "[#{option_name(opt)}]" }.join(" ")
  args = arguments.map{|arg,_| "#{arg.to_s.upcase}"    }.join(" -- ")
  optargs = "#{opts} #{oper} " + (args.empty? ? "" : "-- #{args}")
  "alf #{operator.rubycase_name} #{optargs.strip}".strip
end