Mike Dalessio
e0c821f69b
and handles URLs with CGI params, recognizes more (and multiple) trailing punctuation marks including entity-encoded punctuation like `"`.
65 lines
1.9 KiB
Ruby
65 lines
1.9 KiB
Ruby
module HtmlHelper
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include ERB::Util
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EXCLUDE_PUNCTUATION = %(.?,:!;"'<>)
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EXCLUDE_PUNCTUATION_REGEX = /[#{Regexp.escape(EXCLUDE_PUNCTUATION)}]+\z/
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def format_html(html)
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fragment = Nokogiri::HTML5.fragment(html)
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auto_link(fragment)
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fragment.to_html.html_safe
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end
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private
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EXCLUDED_ELEMENTS = %w[ a figcaption pre code ]
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EMAIL_AUTOLINK_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/
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URL_REGEXP = URI::DEFAULT_PARSER.make_regexp(%w[http https])
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def auto_link(fragment)
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fragment.traverse do |node|
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next unless auto_linkable_node?(node)
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# Take care to escape the html text node, so that the subsequent Nokogiri re-parse doesn't
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# create tags where there aren't any.
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content = h(node.text)
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linked_content = content.dup
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auto_link_urls(linked_content)
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auto_link_emails(linked_content)
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if linked_content != content
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node.replace(Nokogiri::HTML5.fragment(linked_content))
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end
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end
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end
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def auto_linkable_node?(node)
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node.text? && node.ancestors.none? { |ancestor| EXCLUDED_ELEMENTS.include?(ancestor.name) }
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end
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def auto_link_urls(linked_content)
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linked_content.gsub!(URL_REGEXP) do |match|
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url, trailing_punct = extract_url_and_punctuation(match)
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%(<a href="#{url}" rel="noreferrer">#{url}</a>#{trailing_punct})
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end
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end
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def extract_url_and_punctuation(url_match)
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url_match = CGI.unescapeHTML(url_match)
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if match = url_match.match(EXCLUDE_PUNCTUATION_REGEX)
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len = match[0].length
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[ url_match[..-(len+1)], url_match[-len..] ]
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else
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[ url_match, "" ]
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end
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end
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def auto_link_emails(text)
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text.gsub!(EMAIL_AUTOLINK_REGEXP) do |match|
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%(<a href="mailto:#{match}">#{match}</a>)
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end
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end
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end
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