From: "Ara.T.Howard" <ahoward@...>
Date: 2004-08-21T00:45:56+09:00
Subject: Re: YAML and line numbers

On Sat, 21 Aug 2004, Jamis Buck wrote:

> Perhaps something like this:
>
>   conf = YAML.load( File.read( "package.yml" ) )
>   p conf['id'] #-> "my.package.id"
>   p conf['id'].line_number #-> 2
>
> The above approach would give you the number of the first line on which
> the requested value was defined. To find the line number on which the
> key was defined, maybe something like this:
>
>   conf.keys.each do { |key| p key.line_number }
>
> Because dynamically adding a line_number attribute to every object read
> by the YAML parser would be prohibitively expensive for some
> applications, you may even want to make it optional:
>
>   YAML.line_numbers = true
>   conf = YAML.load(...)
>   ...
>
> Anyway, something like that would be sufficient for my needs. :)


but how would that work with something like this:

   yaml = <<-yaml
   ---
     - array element 0
     - array element 1
     - array element 2
   yaml

   array = YAML.load yaml

   p array.line_number  # => 1

so each object returns would have the method 'line_number' added?  guess that
could work.  perhaps something like

   obj.yaml_lineno

though, since 'line_number' is a bit generic.

cheers.

-a
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