From: Rob Burrowes <rob@...>
Date: 2006-05-20T18:04:41+09:00
Subject: Re: Parsing XML into a complete domain object

If you just want to walk the tree from any entry point, through all  
the sub-levels, you can use the standard each_recurse method.

		#Recurse end to end, printing the tags
		@doc.elements.each("definitions/src") do |element|
			print "<", element.name.to_s, ">"
			element.each_recursive do |childElement|
				print "<", childElement.name.to_s, ">"
			end
		end

If you just want the next level of children, but no deeper, I'm not  
sure what you call.  I did this when I played with REXML, and the  
obvious each_child doesn't give you an REXML::Element. It gives a  
REXML::Text element at the first iteration, then the next  
REXML::Element, then another REXML::Text object, etc. Not quite what  
you want. But adding this to your code will work.

module REXML
	# Visit all children of  this node, but don't recurse to their children
	def each_child_element(&block)
		self.elements.each {|node|
			block.call(node)
		}
	end
end

It probably  exists in some form in the REXML module, but I can't  
find it, so I recreated it (by a little hacking of the modules  
each_recurse).

You can then
		#printing the tags of the immediate children.
		@doc = Document.new(File.new(format_file))
		@doc.elements.each("definitions") do |element|		
			element.each_child_element do |childElement|
				print "<", childElement.name.to_s, ">"
			end
		end

or recursively walk the tree by calling each_child_element for each  
returned childElement (as with the first example)

	def recurse(the_element)
			the_element.each_child_element do |childElement|
				print "<", childElement.name.to_s, ">"
				recurse(childElement)
			end
	end

	@doc.elements.each("definitions/src") do |element|		
		recurse(element)
	end





On 20/05/2006, at 9:06 AM, Brian Cowdery wrote:

> Recently at work we've decided to attempt to build a basic XML driven
> automation framework to work with Watir (a web development testing
> library for ruby).
>
> I cant figure out how to loop through each level of the REXML document
> to extract the data needed to build the complete object.
>
> It seems that if i try to use any iterators on a root.elements[]  
> object
> it converts it to text so i can't nest another iterator or loop to
> access the innards.
>
> my only recourse has been to resort to a ton of nested while loops  
> which
> is ugly when compared to most other ruby loops.
>
> eg.
> i = 1
> while root.elements['cases'].elements[i] != nil
>
>  n = 1
>  while root.elements['cases'].elements['test-case'] != nil
>
>    #more loops here. continue down the chain until i can build the
>    #object from the inside out.
>
>  i = i+i
>  end
>
> i = i+i
> end
>
>
>
> my xml looks like this
> <script>
> <project-name></project-name>
> <start-url></start-url>
>
>  <test-case id="1">
>   <test-step id="1">
>    <test>
>     <interaction>double click</interaction>
>     <element>
>      <name>button 1</type>
>      <type>button</type>
>     <element>
>    </test>
>    <check>
>     <element>
>      <name>Page title</type>
>      <type>text</type>
>     <element>
>    </check>
>   </test-step>
>
>   <test-step id="2">
>     ...
>   </test-step>
>  </test-case>
>
>  <test-case id="2">
>   ...
>  </test-case>
> </script>
>
> somehow i have to get THAT modeled into an object
> script object contains test-cases, test-cases contain test-steps  
> etc....
>
> Any thoughts? (sorry for the long post... its kinda hard to explain
> without showing EVERYTHING.
>
> -- 
> Posted via http://www.ruby-forum.com/.
>