From: Robert Klemme <bob.news@...>
Date: 2003-12-01T16:57:09+09:00
Subject: Re: Need library for parsing configuration files


"Gavri Savio Fernandez" <Gavri_F@infosys.com> schrieb im Newsbeitrag
news:557E17BE74D22143B7BE70EB60E33E9909196571@shlmsg01.ad.infosys.com...
> > -----Original Message-----
> > From: T. Onoma [mailto:transami@runbox.com]
> > Subject: Re: Need library for parsing configuration files
>
> > > hi,
> > > i'm writing an application which needs to parse a
> > configuration file on
> > > program startup. is there a prefered format for
> > configuration files in
> > > ruby? is there a library for such a purpose? i suppose i
> > could do the
> > > parsing myself, but i was just wondering if there is a
> > sophisticated way
> > > out there.
> > >
> > > thank you
> >
> > I would consider Yaml.
>
> Yaml is human-readable-and-writable, agreed, but only if the human is a
programmer  :-)
> Actually the problem is that i want configuration values segregated into
different groups.
> Users would find the Yaml syntax which requires indentation esoteric.
>
> how feasible is it to use Kernel::load()  ?
> maybe i should let the user modify a ruby source-file, which looks kind
of like this
>
> application.ui = true        #true, false
> window.size = 1000                                                 #
250 - 3000
> images.max = 10                                                      #
1 - 50
>
> and then load this file at an appropriate  time.
> is this a feasible way to do things?

Like this?


class Config
  def initialize
    @values = {}
  end

  def method_missing(sym,*args)
    s = sym.to_s.freeze

    if s[-1] == ?=
      # setter
      @values[s] = args.size == 1 ? args[0] : args
    else
      # getter
      @values[s] ||= self.class.new
    end
  end

  def load(file)
    instance_eval File.readlines(file, nil).shift
  end

  def self.load(file)
    conf = self.new
    conf.load file
    conf
  end
end

conf = Config.new

conf.load "conf.rc"
p conf

conf = Config.load "conf.rc"
p conf


Regards

    robert