remove commented block in xml ruby - ruby

Question

I'm required to write a script that can remove a commented block in xml file, and save it back to its directory.
<Configure id="Server" class="org.eclipse.jetty.server.Server">
<!-- =========================================================== -->
<!-- Server Thread Pool -->
<!-- =========================================================== -->
<Set name="ThreadPool">
<!-- Default queued blocking threadpool -->
<New class="org.eclipse.jetty.util.thread.QueuedThreadPool">
<Set name="minThreads">10</Set>
<Set name="maxThreads">10000</Set>
<Set name="detailedDump">false</Set>
</New>
</Set>
<!-- =========================================================== -->
<!-- Set connectors -->
<!-- =========================================================== -->
<!--
<Call name="addConnector">
<Arg>
<New class="org.eclipse.jetty.server.nio.SelectChannelConnector">
<Set name="host"><SystemProperty name="jetty.host" /></Set>
<Set name="port"><SystemProperty name="jetty.port" default="8983"/></Set>
<Set name="maxIdleTime">50000</Set>
<Set name="Acceptors">2</Set>
<Set name="statsOn">false</Set>
<Set name="confidentialPort">8443</Set>
<Set name="lowResourcesConnections">5000</Set>
<Set name="lowResourcesMaxIdleTime">5000</Set>
</New>
</Arg>
</Call>
-->
<Call name="addConnector">
<Arg>
<New class="org.eclipse.jetty.server.bio.SocketConnector">
<Set name="host"><SystemProperty name="jetty.host" /></Set>
<Set name="port"><SystemProperty name="jetty.port" default="8983"/></Set>
<Set name="maxIdleTime">50000</Set>
<Set name="lowResourceMaxIdleTime">1500</Set>
<Set name="statsOn">false</Set>
</New>
</Arg>
</Call>
</Configure>
on this xml
How can I comment out this block only?
<!--
<Call name="addConnector">
<Arg>
<New class="org.eclipse.jetty.server.nio.SelectChannelConnector">
<Set name="host"><SystemProperty name="jetty.host" /></Set>
<Set name="port"><SystemProperty name="jetty.port" default="8983"/></Set>
<Set name="maxIdleTime">50000</Set>
<Set name="Acceptors">2</Set>
<Set name="statsOn">false</Set>
<Set name="confidentialPort">8443</Set>
<Set name="lowResourcesConnections">5000</Set>
<Set name="lowResourcesMaxIdleTime">5000</Set>
</New>
</Arg>
</Call>
-->
I have tried it with this but
require 'nokogiri'
file = File.read("jetty.xml")
xml = Nokogiri::XML(file)
#replace <!-- --> with a space
xml.xpath("//comment()").each do |node|
node.content =node.content.gsub!(/(^\D\W[<!\-\-}]\W[\-\->])/,' ')
end
File.open("newjetty.xml","w") do |f|
f.write xml.to_xml
end
this code only remove the text within the comment
Output:
<!---->
<!---->
<!---->
<Set name="ThreadPool">
<!---->
<New class="org.eclipse.jetty.util.thread.QueuedThreadPool">
<Set name="minThreads">10</Set>
<Set name="maxThreads">10000</Set>
<Set name="detailedDump">false</Set>
</New>
</Set>
<!---->
<!---->
<!---->
<!---->
<!---->

Answer 1

You should delete the node, as it is a comment node. You can use the inner text to parse it and add it again.
require 'nokogiri'
file = File.read("jetty.xml")
xml = Nokogiri::XML(file)
#replace <!-- --> with a space
xml.xpath("//comment()").each do |node|
t = Nokogiri::XML::DocumentFragment.parse(node.content)
node.add_next_sibling(t)
node.remove
end
File.open("newjetty.xml","w") do |f|
f.write xml.to_xml
end
Here you are parsing the comments content, add it as the next sibling and remove the node itself.
This basically works, however the string-only contents are also added as nodes, making this a mixed content document, which you most certainly do not want for a jetty configuration file.
So there should also be some logic included that checks for the node type (text versus element) and only includes elements.