CompareXML is a fast, lightweight and feature-rich tool that will solve your XML/HTML comparison or diffing needs. its purpose is to compare two instances of Nokogiri::XML::Node or Nokogiri::XML::NodeSet for equality or equivalency.
License: MIT License
Thank you for this gem! I found it to be super helpful in tests.
One thing that was really unexpected for me is that options to ignore attributes require the attribute to be present in both elements.
For example, with ignore_attrs_by_name: ['class'] I expected the following two elements to be equivalent:
<div class="foo"></div>
<div></div>However, they are considered to be different.
For them to be equivalent the second element must have a [class] attribute, with any value:
<div class="foo"></div>
<div class></div>Maybe this is something that could be changed or documented.
Thanks again for the gem!
Consider this code:
require 'compare-xml'
left_s = <<EOS
<?xml version="1.0" encoding="UTF-8"?>
<project>
<keepDependencies>false</keepDependencies>
<properties>
<hudson.plugins.buildblocker.BuildBlockerProperty plugin="[email protected]">
<useBuildBlocker>false</useBuildBlocker>
<blockLevel>GLOBAL</blockLevel>
<scanQueueFor>DISABLED</scanQueueFor>
<blockingJobs/>
</hudson.plugins.buildblocker.BuildBlockerProperty>
<com.sonyericsson.rebuild.RebuildSettings plugin="[email protected]">
<autoRebuild>false</autoRebuild>
<rebuildDisabled>false</rebuildDisabled>
</com.sonyericsson.rebuild.RebuildSettings>
<hudson.model.ParametersDefinitionProperty>
<parameterDefinitions>
<hudson.model.StringParameterDefinition>
<name>approval_message</name>
<defaultValue/>
</hudson.model.StringParameterDefinition>
</parameterDefinitions>
</hudson.model.ParametersDefinitionProperty>
</properties>
</project>
EOS
right_s = <<EOS
<?xml version="1.0" encoding="UTF-8"?>
<project>
<keepDependencies>false</keepDependencies>
<properties>
<hudson.model.ParametersDefinitionProperty>
<parameterDefinitions>
<hudson.model.StringParameterDefinition>
<name>approval_message</name>
<defaultValue/>
</hudson.model.StringParameterDefinition>
</parameterDefinitions>
</hudson.model.ParametersDefinitionProperty>
</properties>
</project>
EOS
left = Nokogiri::XML left_s
right = Nokogiri::XML right_s
res = CompareXML.equivalent? left, right, verbose: true
pp res
produces
[{:node1=>
#(Element:0x3c {
name = "hudson.plugins.buildblocker.BuildBlockerProperty",
attributes = [
#(Attr:0x50 { name = "plugin", value = "[email protected]" })],
children = [
#(Text "\n" + " "),
#(Element:0x64 {
name = "useBuildBlocker",
children = [ #(Text "false")]
}),
#(Text "\n" + " "),
#(Element:0x78 { name = "blockLevel", children = [ #(Text "GLOBAL")] }),
#(Text "\n" + " "),
#(Element:0x8c {
name = "scanQueueFor",
children = [ #(Text "DISABLED")]
}),
#(Text "\n" + " "),
#(Element:0xa0 { name = "blockingJobs" }),
#(Text "\n" + " ")]
}),
:node2=>
#(Element:0xb4 {
name = "hudson.model.ParametersDefinitionProperty",
children = [
#(Text "\n" + " "),
#(Element:0xc8 {
name = "parameterDefinitions",
children = [
#(Text "\n" + " "),
#(Element:0xdc {
name = "hudson.model.StringParameterDefinition",
children = [
#(Text "\n" + " "),
#(Element:0xf0 {
name = "name",
children = [ #(Text "approval_message")]
}),
#(Text "\n" + " "),
#(Element:0x104 { name = "defaultValue" }),
#(Text "\n" + " ")]
}),
#(Text "\n" + " ")]
}),
#(Text "\n" + " ")]
}),
:diff1=>"hudson.plugins.buildblocker.BuildBlockerProperty",
:diff2=>"hudson.model.ParametersDefinitionProperty"}]
Since hudson.plugins.buildblocker.BuildBlockerProperty and com.sonyericsson.rebuild.RebuildSettings are added to the left XML blob but the XML blobs are otherwise the same, I'd expect node1 to show what it does but node2 to be empty. Instead, node2 seems to be showing what is at the spot in the XML tree where it found what is in node1. That doesn't seem right - it should just show the addition.
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