xpath searching in fragments is inconsistent

[tnt]

In the following session I'd expect three text nodes"

[1] pry(main)> require 'nokogiri'
=> true
[2] pry(main)> Nokogiri::VERSION
=> "1.6.7.2"
[3] pry(main)> doc = Nokogiri::HTML.fragment 'some text <p>more text</p> excess text'
=> #(DocumentFragment:0x2acb9d91fc60 {
  name = "#document-fragment",
  children = [
    #(Text "some text "),
    #(Element:0x2acb9d91f7b0 { name = "p", children = [ #(Text "more text")] }),
    #(Text " excess text")]
  })
[4] pry(main)> doc.xpath('//text()')
=> []
[5] pry(main)> doc.xpath('text()')
=> [#<Nokogiri::XML::Text:0x2acb9d91f8a0 "some text ">, #<Nokogiri::XML::Text:0x2acb9d91f65c " excess text">]
[6] pry(main)> RUBY_VERSION
=> "2.1.5"
[7] pry(main)> RUBY_PLATFORM
=> "x86_64-linux"

I didn't do any special. Just gem install.

[flavorjones]

There are some known edge cases around xpath-searching fragments; the workaround is to search with ".//" as the prefix:

2.3.1 :007 > doc.xpath ".//text()"
 => [#<Nokogiri::XML::Text:0x86e1d8 "some text ">, #<Nokogiri::XML::Text:0xadd950 "more text">, #<Nokogiri::XML::Text:0xaddf7c " excess text">] 

We should really fix this. Leaving open.

[flavorjones]

This is the same issue described in #572, closing.