Mike Dalessio
56 lines
1.5 KiB
Ruby
56 lines
1.5 KiB
Ruby
module HtmlHelper
|
|
def format_html(html)
|
|
fragment = Nokogiri::HTML.fragment(html)
|
|
|
|
auto_link(fragment)
|
|
|
|
fragment.to_html.html_safe
|
|
end
|
|
|
|
private
|
|
EXCLUDED_ELEMENTS = %w[ a figcaption pre code ]
|
|
EMAIL_REGEXP = /\b[a-zA-Z0-9.!#$%&'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*\b/
|
|
URL_REGEXP = URI::DEFAULT_PARSER.make_regexp(%w[http https])
|
|
|
|
def auto_link(fragment)
|
|
fragment.traverse do |node|
|
|
next unless auto_linkable_node?(node)
|
|
|
|
content = node.text
|
|
linked_content = content.dup
|
|
|
|
auto_link_urls(linked_content)
|
|
auto_link_emails(linked_content)
|
|
|
|
if linked_content != content
|
|
node.replace(Nokogiri::HTML.fragment(linked_content))
|
|
end
|
|
end
|
|
end
|
|
|
|
def auto_linkable_node?(node)
|
|
node.text? && node.ancestors.none? { |ancestor| EXCLUDED_ELEMENTS.include?(ancestor.name) }
|
|
end
|
|
|
|
def auto_link_urls(linked_content)
|
|
linked_content.gsub!(URL_REGEXP) do |match|
|
|
url, trailing_punct = extract_url_and_punctuation(match)
|
|
%(<a href="#{url}" rel="noreferrer">#{url}</a>#{trailing_punct})
|
|
end
|
|
end
|
|
|
|
def extract_url_and_punctuation(url_match)
|
|
if url_match.end_with?(".", "?", ",", ":")
|
|
[ url_match[..-2], url_match[-1] ]
|
|
else
|
|
[ url_match, "" ]
|
|
end
|
|
end
|
|
|
|
def auto_link_emails(text)
|
|
text.gsub!(EMAIL_REGEXP) do |match|
|
|
%(<a href="mailto:#{match}">#{match}</a>)
|
|
end
|
|
end
|
|
end
|