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require 'rexml/document'
require 'rexml/streamlistener'
require 'set'
class LinkGrabber
include REXML::StreamListener
attr_reader :links
def initialize(interesting_tags = {'a' => %w{href}, 'img' => %w{src}}.freeze)
@tags = interesting_tags
@links = Set.new
end
def tag_start(name, attrs)
@tags[name].each do |uri_attr|
@links << attrs[uri_attr] if attrs[uri_attr]
end if @tags[name]
end
def parse(text)
REXML::Document.parse_stream(text, self)
end
end
text = %{"test
<a href="http://www.example.com/">http://www.example.com/</a>, http://www.example.com/blog/. Email me at <a
href="mailto:bob@example.com">b@e.com</a>.}
grabber = LinkGrabber.new
grabber.parse(text)
p grabber.links
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