This is a mini-framework fro defining DSLs to extract data in a convinient form from structures like Nokogiri::XML::Node.
Consider you have the following XML:
<entry>
<id>https://sites.google.com/feeds/content/domainName/siteName/1265948545471894517</id>
<updated>2009-08-03T19:35:32.488Z</updated>
<edited xmlns:app="http://www.w3.org/2007/app">2009-08-03T19:35:32.488Z</edited>
<title>files</title>
<content type="xhtml">
<div xmlns="http://www.w3.org/1999/xhtml">Page html content here</div>
</content>
<link rel="alternate" type="text"
href="https://sites.google.com/domainName/siteName/files"/>
<link rel="self" type="application/atom+xml"
href="https://sites.google.com/feeds/content/domainName/siteName/12671894517"/>
<link rel="edit" type="application/atom+xml"
href="https://sites.google.com/feeds/content/domainName/siteName/12671894517"/>
<feedLink href="httpn://sites.google.com/feeds/content/domainName/siteName?parent=12671894517"/>
<pageName>files</pageName>
<revision>1</revision>
</entry>
You may have following DSL to parse the above XML:
class GoogleSitesEntry
include ChildExtractors
apply_convention CamelCase
child_content {
id
title
page_name
feed_link
}
child_time {
updated
edited
}
child_inner_html { content }
child_link_href {
alternate
self
edit
}
child_attribute { feed_link(:href) }
end
module ChildExtractors
include BaseExtractor
define_extractor :child_content do |source_node, child_name|
source_node.at_xpath(child_name).try(:content)
end
define_extractor :child_time do |source_node, child_name|
str = child_content(source_node, child_name)
Time.parse(str) if str
end
...
end