From: Alberto Alberto <palberto@...>
Date: 2009-02-16T20:13:15+09:00
Subject: Re: Xpath

7stud -- wrote:
> 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']



I try this solution and it works, but now my question is after operation
parents << parent.name

over parents array can I obtain a value of attributes with someting like 
this?

        .attributes.each_attribute {|attr|
    p attr.expanded_name+" => "+attr.value
  }

Thank's a lot for quickly support.
Alberto
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