Class: Clive::Parser

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

Defined Under Namespace

Classes: MissingArgumentError, MissingOptionError

Constant Summary collapse

DEFAULTS =
{
  :state => ::Clive::StructHash
}

Instance Method Summary collapse

Constructor Details

#initialize(base, config) ⇒ Parser

Returns a new instance of Parser.

Parameters:

Options Hash (config):

  • :state (.new, #[], #[]=, #alias)

    What class the state should be



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# File 'lib/clive/parser.rb', line 22

def initialize(base, config)
  @base = base
  @config = DEFAULTS.merge(config)
end

Instance Method Details

#parse(argv, pre_state) ⇒ Object

The parser should work how you expect. It allows you to put global options before and after a command section (if it exists, which it doesn’t), so you have something like.

app [global] [command] [global]

Where the [global] sections are made of options and arguments and

command

is made of

command
options/args

Only one command can be run, if you attempt to use two the other will be caught as an argument.

Parameters:

  • argv (Array)

    The input to parse from the command line, usually ARGV.

  • pre_state (Hash)

    A pre-populated state to be used.



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# File 'lib/clive/parser.rb', line 47

def parse(argv, pre_state)
  @argv = argv
  @i    = 0

  @state = @config[:state].new(pre_state)
  @state.store :args, []

  # Pull out 'help' command immediately if found
  if @argv[0] == 'help'
    if @argv[1]
      if @base.has?(@argv[1])
        command = @base.find(@argv[1])
        command.run_block({})
        puts command.help
      else
        puts "Error: command #{@argv[1]} could not be found. Try `help` to see the available commands."
      end
    else
      puts @base.help
    end
    Kernel.exit 0
  end

  until ended?
    # does +curr+ exist? (and also check that if it is a command a command hasn't been run yet
    if @base.has?(curr) && ((@base.find(curr).kind_of?(Command) && !command_ran?) || @base.find(curr).kind_of?(Option))

      found = @base.find(curr)

      # is it a command?
      if found.kind_of?(Command)
        @command_ran = true
        @state.store found.names, found.run_block(@config[:state].new)

        inc
        args = []

        until ended?
          if found.has?(curr)
            run_option found.find(curr), found
          else
            break unless found.args.possible?(args + [curr])
            args << curr
          end
          inc
        end
        dec

        found.run @state, validate_arguments(found, args), found

      # otherwise it is an option
      else
        run_option found
      end

    # it's a no- option
    elsif curr[0..4] == '--no-' && @base.find("--#{curr[5..-1]}").config[:boolean] == true
      @base.find("--#{curr[5..-1]}").run @state, [false]

    # it's one (or more) short options
    elsif curr[0..0] == '-' && curr.size > 2 && @base.has?("-#{curr[1..1]}")
      currs = curr[1..-1].split('').map {|i| "-#{i}" }

      currs.each do |c|
        opt = @base.find(c)
        raise MissingOptionError.new(c) unless opt

        if c == currs.last
          run_option opt
        else
          # can't take any arguments as an option is next to it
          if opt.args.min > 0
            raise MissingArgumentError.new(opt, [], opt.args)
          else
            opt.run @state, [true]
          end
        end
      end

    # otherwise it is an argument
    else
      @state.args << curr
    end

    inc
  end

  @state
end