From: 7stud -- <bbxx789_05ss@...>
Date: 2009-02-14T02:46:27+09:00
Subject: Re: Xpath

Alberto Alberto wrote:
>
> I would like to know if it is possible, using REXML, get full path from
> root, of document XML, to leaf node, through a XPath query?
> 
> 
> example with l'XML:
> 
> <primo>
>    <secondo>
>        <terzo id='3'>
>        <terzo/>
>    <secondo/>
>    <quarto>
>    ...
>    <quarto/>
> <primo>
> 
> 
> Xpath: //terzo[@id='3']
> 
> Output:
>       //primo/secondo/terzo[id='3']
> 

Is that really considered XML?

require "rexml/document"
include REXML

xml = <<TO_END_OF_XML
<primo>
   <secondo>
       <terzo id='3'>
       </terzo>
   </secondo>
   <quarto>
   ...
   </quarto>

   <terzo id='3'>
   </terzo>

</primo>
TO_END_OF_XML

doc = Document.new xml

target = "//terzo[@id='3']"
paths = []

XPath.each(doc, target) do |element|
  parents = []

  while true
    parent = element.parent
    break if parent.name == ""

    parents << parent.name
    element = parent
  end

  path = parents.reverse.join('/')
  paths << "//#{path}#{target[1..-1]}"
end

puts *paths

--output:--
//primo/secondo/terzo[@id='3']
//primo/terzo[@id='3']

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