如何在不丢失HTML实体的情况下使用nokogiri解析XML

Question

如果您在后面的部分看到下面的输出，ruby正在删除所有html实体。如何在不丢失HTML实体的情况下使用nokogiri解析XML？

--- BEFORE ---
<blog:entryFull>
&lt;p&gt;&lt;iframe src="http://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Ftracks%2F39858946&amp;amp;show_artwork=true" width="100%" height="166" frameborder="no" scrolling="no"&gt;&lt;/iframe&gt;&lt;/p&gt;</blog:entryFull>
--- AFTER --- 
<blog:entryFull>
piframe src="http://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Ftracks%2F39858946amp;show_artwork=true" width="100%" height="166" frameborder="no" scrolling="no"/iframe/p</blog:entryFull>
  </blog:example>

这是代码：

f = File.open(item)
contents = ""
f.each {|line|
  contents << line
}
puts "--- BEFORE ---"
puts contents
puts "--- AFTER ---"
doc = Nokogiri::XML::DocumentFragment.parse(contents) 
puts doc
f.close 

Answer 1

您的测试文件可能包含一些无效的HTML实体。

nokogiri.rb：

require 'nokogiri'
puts "--- INVALID ---"
invalid_xml = <<-XML
<blog:entryFull>invalid M&Ms</blog:entryFull><!-- invalid M and M's -->
<blog:entryFull>
&lt;p&gt;&lt;iframe src="http://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Ftracks%2F39858946&amp;amp;show_artwork=true" width="100%" height="166" frameborder="no" scrolling="no"&gt;&lt;/iframe&gt;&lt;/p&gt;</blog:entryFull>
XML
doc = Nokogiri::XML::DocumentFragment.parse(invalid_xml)
puts doc
puts "--- VALID ---"
valid_xml = <<-XML
<blog:entryFull>valid M&amp;Ms</blog:entryFull><!-- valid M and M's -->
<blog:entryFull>
&lt;p&gt;&lt;iframe src="http://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Ftracks%2F39858946&amp;amp;show_artwork=true" width="100%" height="166" frameborder="no" scrolling="no"&gt;&lt;/iframe&gt;&lt;/p&gt;</blog:entryFull>
XML
doc = Nokogiri::XML::DocumentFragment.parse(valid_xml)
puts doc

结果：

$ ruby nokogiri.rb
--- INVALID ---
<blog:entryFull>invalid M</blog:entryFull><!-- invalid M and M's -->
<blog:entryFull>
piframe src="http://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Ftracks%2F39858946amp;show_artwork=true" width="100%" height="166" frameborder="no" scrolling="no"/iframe/p</blog:entryFull>
--- VALID ---
<blog:entryFull>valid M&amp;Ms</blog:entryFull><!-- valid M and M's -->
<blog:entryFull>
&lt;p&gt;&lt;iframe src="http://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Ftracks%2F39858946&amp;amp;show_artwork=true" width="100%" height="166" frameborder="no" scrolling="no"&gt;&lt;/iframe&gt;&lt;/p&gt;</blog:entryFull>

所以，

1. 修复输入XML
2. 使用STRICT ParseOptions

严格解析示例：

invalid_xml = <<-XML
<?xml version="1.0" encoding="UTF-8"?>
<root>
  <blog:entryFull>invalid M&Ms</blog:entryFull>
  <blog:entryFull>
  &lt;p&gt;&lt;iframe src="http://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Ftracks%2F39858946&amp;amp;show_artwork=true" width="100%" height="166" frameborder="no" scrolling="no"&gt;&lt;/iframe&gt;&lt;/p&gt;</blog:entryFull>
</root>
XML
begin
  doc = Nokogiri::XML(invalid_xml) do |configure|
    configure.strict # strict parsing
  end
  puts doc
rescue => e
  puts 'INVALID XML'
end

Answer 2

Qambar，我无法重新创建您的问题。然而，给定这些文件/输入，我能够产生您想要的输出：

test.xml

<blog:entryFull> &lt;p&gt;&lt;iframe src="https://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Ftracks%2F39858946&amp;amp;show_artwork=true%22" width="100%" height="166" frameborder="no" scrolling="no"&gt;&lt;/iframe&gt;&lt;/p&gt;</blog:entryFull>

nokogiri.rb

require 'nokogiri'
f = File.open("./test.html")
contents = ""
f.each {|line|
  contents << line
}
puts "--- BEFORE ---"
puts contents
puts "--- AFTER ---"
doc = Nokogiri::XML::DocumentFragment.parse(contents) 
puts doc.inner_html
f.close

控制台

Development/Code » ruby nokogiri.rb
--- BEFORE ---
<blog:entryFull> &lt;p&gt;&lt;iframe src="https://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Ftracks%2F39858946&amp;amp;show_artwork=true%22" width="100%" height="166" frameborder="no" scrolling="no"&gt;&lt;/iframe&gt;&lt;/p&gt;</blog:entryFull>
--- AFTER ---
<blog:entryFull> &lt;p&gt;&lt;iframe src="https://w.soundcloud.com/player/?url=http%3A%2F%2Fapi.soundcloud.com%2Ftracks%2F39858946&amp;amp;show_artwork=true%22" width="100%" height="166" frameborder="no" scrolling="no"&gt;&lt;/iframe&gt;&lt;/p&gt;</blog:entryFull>

Answer 3

我所做的工作是通过regex获取xml标记，然后使用html实体转换html实体。然后使用nokogiri html解析器进行解析。