Class: ArgvParser

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

Instance Method Summary collapse

Constructor Details

#initialize ⇒ ArgvParser

Returns a new instance of ArgvParser.



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# File 'lib/argv_parser.rb', line 3

def initialize
  @args = Hash.new
  @aliases = Hash.new
  @l_short = 0
  @l_long = 0
end

Instance Method Details

#help ⇒ Object 



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# File 'lib/argv_parser.rb', line 23

def help
  puts "Help:"
  @args.each do |k,v|
    spaces = ""
    (@l_short-k.length).times { spaces << " " }
    spaces2 = ""
    (@l_long-v[:long].length).times { spaces2 << " " }
    puts "#{k}#{spaces} #{v[:long]}#{spaces2} mandatory: #{v[:opts][:mandatory] == true}"
  end
end

#hook(short, long, type, options) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/argv_parser.rb', line 10

def hook(short, long, type, options)
  raise ArgumentError.new("short is nil") if not short

  @args[short.downcase] = {
    :long => long,
    :type => type,
    :opts => options,
    :yield => Proc.new {|p, v| yield(p, v) }
  }
  @l_short = short.length + 1 if @l_short < short.length + 1
  @l_long = long.length + 1 if @l_long < long.length + 1
end

#parse!(args) ⇒ Object 



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# File 'lib/argv_parser.rb', line 34

def parse!(args)
  begin
  executor = Array.new
  i = 0

  @mandatory = Array.new
  @args.each do |k,v|
    @mandatory.push k if v[:opts][:mandatory]
  end

  while i < args.length
    if v = @args[args[i].downcase]
      @mandatory.delete args[i].downcase

      n = nil
      if v[:type]
        raise ArgumentError.new("argument for #{args[i].downcase} missing") if i+1 >= args.length
        i += 1
        case v[:type].to_s
          when "Array"
            n = args[i].split ','
          when "Float"
            n = args[i].to_f
          when "Integer"
            n = args[i].to_i
          else
            n = $1 if args[i] =~ /^\"?(.*)\"?$/
          end
      end
      executor.push [v[:yield], n]
    else
      raise ArgumentError.new("argument #{args[i].downcase} unknown")
    end
    i += 1
  end

  if not @mandatory.empty?
    raise ArgumentError.new("mandatory #{@mandatory[0]} is missing")
  end

  if executor.empty?
    help
  else
    executor.each do |e|
      e[0].call(self, e[1])
    end
  end
  rescue Exception => e
    puts "#{e.class}: #{e.message}\n"
    help
  end
end