From: David Sainte-claire <dsainteclaire@...>
Date: 2009-12-01T03:58:28+09:00
Subject: Re: Odd puts behaviour with REXML

Robert Klemme wrote:
> On 30.11.2009 19:33, John W Higgins wrote:
>>> option that I can set on the puts method that will solve it.  Hopefully
>>> <prefix>Find related product support and help in</prefix>
>>>    puts "Did XPATH match any profile elements?"
>>> Did XPATH match any profile elements?
>>> Support but I don't have a clue where the _Link is coming from?
>>>
>>>
>> Rule one of anything like this is to remove each element from the XML file
>> one by one and see which one is breaking you. In this case you will find
>> that it's the link element because you are using ampersands in the URL. See
>> here
>> 
>> http://www.w3.org/TR/xhtml1/guidelines.html#C_12
> 
> One more hint: when posting things like this it is best to provide a
> _complete_ example.  From the XPath given it is clear that something
> must be missing (there are no "product" tags).  It's pretty easy with 
> REXML:
> 
> robert@fussel ~
> $ cat x.rb
> 
> require 'rexml/document'
> 
> data = REXML::Document.new <<'DOC'
> <product>
> <profile>
> <support>
> <title>eSupport</title>
> <prefix>Find related product support and help in</prefix>
> <link>
> http://www.somecompany.com/US/perl/model-home.pl?XID=M:products:crmportal&LOC=3&mdl=someModel
> </link>
> </support>
> </profile>
> </product>
> DOC
> 
> 
> data.elements.each("product/profile/support"){|element|
>    element.elements.each() do |child|
>      puts "Did XPATH match any profile elements?"
>      puts  child.text
>    end
> }
> 
> Which on my box produces:
> 
> robert@fussel ~
> $ ruby19 x.rb
> /usr/local/lib/ruby19/1.9.1/rexml/parsers/treeparser.rb:95:in `rescue in
> parse': #<RuntimeError: Illegal character '&' in raw string "
> (REXML::ParseException)
> http://www.somecompany.com/US/perl/model-home.pl?XID=M:products:crmportal&LOC=3&mdl=someModel
> ">
> /usr/local/lib/ruby19/1.9.1/rexml/text.rb:155:in `block in check'
> /usr/local/lib/ruby19/1.9.1/rexml/text.rb:153:in `scan'
> /usr/local/lib/ruby19/1.9.1/rexml/text.rb:153:in `check'
> /usr/local/lib/ruby19/1.9.1/rexml/text.rb:125:in `parent='
> /usr/local/lib/ruby19/1.9.1/rexml/parent.rb:19:in `add'
> /usr/local/lib/ruby19/1.9.1/rexml/parsers/treeparser.rb:45:in `parse'
> /usr/local/lib/ruby19/1.9.1/rexml/document.rb:228:in `build'
> /usr/local/lib/ruby19/1.9.1/rexml/document.rb:43:in `initialize'
> x.rb:4:in `new'
> x.rb:4:in `<main>'
> ...
> Illegal character '&' in raw string "
> http://www.somecompany.com/US/perl/model-home.pl?XID=M:products:crmportal&LOC=3&mdl=someModel
> "
> Line: 8
> Position: 221
> Last 80 unconsumed characters:
> </link>
>          from
> /usr/local/lib/ruby19/1.9.1/rexml/parsers/treeparser.rb:20:in `parse'
>          from /usr/local/lib/ruby19/1.9.1/rexml/document.rb:228:in 
> `build'
>          from /usr/local/lib/ruby19/1.9.1/rexml/document.rb:43:in
> `initialize'
>          from x.rb:4:in `new'
>          from x.rb:4:in `<main>'
> 
> robert@fussel ~
> $
> 
> How did you manage to get REXML parse this?
> 
> Kind regards
> 
>   robert

That's really interesting.  This works, but just gives that odd output 
like this:  ???Product_Support_Link_Title???

Here is exactly what I'm doing:

I have XML that looks like this:
<product>
<profile>
<support>
<title>eSupport</title>
<prefix>Find related product support and help in</prefix>
<link>
http://www.somecompany.com/US/perl/model-home.pl?XID=M:products:crmportal&LOC=3&mdl=someModel
</link>
</support>
</profile>
</product>

And I'm walking it using REXML like this:
data.elements.each("product/profile/support"){|element|
  element.elements.each() do |child|
    puts "Did XPATH match any profile elements?"
    puts  child.text
  end
}

Where data is the body of an HTTP GET request to a ReST-ish web service 
(I can't post the endpoint of the web service since it's an internal 
server)

I'm invoking the web service from a file called product.rb using the 
Rails command script/runner app/models/product.rb

Maybe if I had done it all from IRB I would have gotten the illegal 
character exception.

Is there any way that I can ignore the formatting rules for illegal 
character and just take the whole text as a string?  The article that 
the first person posted said that the webservice should return links in 
this format:
http://www.somecompany.com/US/perl/model-home.pl?XID=M:products:crmportal&amp;LOC=3&mdl=someModel

using &amp; instead of just & between arguments in the URL, which might 
fly with REXML, but I'm not sure how to strip all that back off to make 
it into a valid link since my browser doesn't know what to do with the 
URL that has &amp; between all the query parameters

Again, apologies if these are totally naive questions.  I'm pretty new 
at this...

Thanks,
David
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