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Bug #3842 ยป rexmlbug.rb

example script to show a bug in REXML's xpath parsing when parentheses are used in selection criteria - halfgaar (Wiebe Cazemier), 09/17/2010 04:00 AM

 
#!/usr/bin/ruby

# example script to show a bug in REXML's xpath parsing when parentheses are used in selection criteria,
# at least on descendant::node()
#
# Author: wiebe@halfgaar.net

require 'rexml/document'

doc = "
<html>
<head>
<title>test</title>
</head>
<body>
<p>
A <a rel=\"sub\" href=\"/\">link</a>.
</p>
</body>
</html>
"

xmldoc = REXML::Document.new(doc)

puts "The Following xpath expressions works fine..."

# Works fine without parentheses
xmldoc.elements.each("descendant::node()[local-name()='link' or local-name()='a' and @rel='sub']") do |element|
puts "writing element: "
puts element.to_s
puts ""
end

puts "The following xpath expression is going to fail..."

# This gives "/usr/lib/ruby/1.9.1/rexml/xpath_parser.rb:437:in `expr': undefined method `inject' for true:TrueClass (NoMethodError)"
xmldoc.elements.each("descendant::node()[(local-name()='link' or local-name()='a') and @rel='sub']") do |element|
puts "writing element: "
puts element.to_s
puts ""
end
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