From: why the lucky stiff <ruby-talk@...>
Date: 2004-08-21T00:57:58+09:00
Subject: Re: YAML and line numbers

Jamis Buck wrote:

> 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(...)
>   ...
>
Well, yeah.  You'll never need the line number for every object, so 
here's what I'm thinkin:

  conf = YAML.load_file( "package.yml" )
  YAML.line_number_of( conf['id'] )

Which basically amounts to:

  parser = YAML::Parser.new
  conf = parser.load( "package.yml" )
  line = parser.line_number_of( conf['id'] )

The lookup table gets stored in the extension.

_why