From: 7stud -- <bbxx789_05ss@...>
Date: 2009-03-19T05:09:02+09:00
Subject: Re: REXML get specific element

Phlip wrote:
> 7stud -- wrote:
> 
>> That doesn't work for me.  And I couldn't figure out the escaping 
>> necessary to handle both a name entered with a single quote or a double 
>> quote.  I thought I understood ruby escaping, but not anymore.
> 
> You understand Ruby escaping - just not XPath escaping. There is none. 

Ah.  Ok.


> If you
> use ' to delimit a string, you cannot use ' inside it. I would love to 
> be proven
> wrong, but I did research this for quite a while.
> 


> Why didn't my $name substitution work? It's in the rdocs...
> 
>> f = File.new('xml4.xml')
>> doc = Document.new(f)
>> 
>> input_name = gets
>> input_name = input_name.chomp
>> 
>> target = XPath.match(doc, "//programmer[text() = 'John']")
>> puts target[0].attributes["age"]
> 
> Wouldn't this work?
> 
> target = XPath.match(doc, "//programmer[text() = $name]", :name => 
> $john)
> 

I don't know what you are trying to do there.  What is $john?  This 
doesn't work for me:

<xml version="1.0" encoding="ISO-8859-1"?>
<programmers>
        <programmer age="50">Joh'n</programmer>
        <programmer age="30">Sally</programmer>
</programmers>


require 'rexml/document'
include REXML

f = File.new('xml4.xml')
doc = Document.new(f)

input_name = gets
input_name = input_name.chomp
p input_name

target = XPath.match(doc, "//programmer[text() = $name]", :name => 
$input_name)
p target

puts target[0].attributes["age"]


--output:--
$ ruby r1test.rb
Joh'n
"Joh'n"
[]
r1test.rb:14: undefined method `attributes' for nil:NilClass 
(NoMethodError)


I thought the question you presented was how are you going to be able to 
handle all these cases in the xml:

<programmer age="50">John</programmer>
<programmer age="50">Joh'n</programmer>
<programmer age="50">Joh"n</programmer>

The user may type in: John, or Joh'n, or Joh"n.
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