From: Sean Russell <ser@...>
Date: 2001-11-18T03:47:52+09:00
Subject: [ruby-talk:25719] Re: REXML: node.type, .parent, .name

Tobias Reif wrote:

> is something like the following possible in REXML (in a convenient way?)?
> 
> 
>    node.children.each do |node|
> 
>      if node.type == 'element'
> 
>        parent_name = node.parent.name
>        self_name   = node.name

Yes, but I don't know why you'd want to.

  element.elements.each do |elem_child|   
    # elem_child is guaranteed to be an Element
    parent_name = elem_child.parent.name
    name = elem_child.name
  end

> If not, these methods would be a useful addition to REXML for me:

These methods are described both in the API docs and the tutorial.

> node.type
> node.parent
> node.child
> node.name

If you really want to check arbitrary children types, do:

  parent.each do |child|
    case child.type
    when Element
      puts "Element"
    when Text
      puts "Text"
    when CData
      puts "CData"
    when Comment
      puts "Comment"
    end
    puts child.parent.type
  end

If you check the inheritance tree (in the documentation) you'll see a 
module called "Namespace".  All classes that include Namespace have a 
"name" method.  All subclasses of Child have a parent method.

The documentation is really helpful if you want to find out about these 
methods.

--- SER


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