101 lines
3.1 KiB
Ruby
101 lines
3.1 KiB
Ruby
require 'html/pipeline/filter'
|
|
require 'uri'
|
|
|
|
module Gitlab
|
|
module Markdown
|
|
# HTML Filter for auto-linking URLs in HTML.
|
|
#
|
|
# Based on HTML::Pipeline::AutolinkFilter
|
|
#
|
|
# Context options:
|
|
# :autolink - Boolean, skips all processing done by this filter when false
|
|
# :link_attr - Hash of attributes for the generated links
|
|
#
|
|
class AutolinkFilter < HTML::Pipeline::Filter
|
|
include ActionView::Helpers::TagHelper
|
|
|
|
# Pattern to match text that should be autolinked.
|
|
#
|
|
# A URI scheme begins with a letter and may contain letters, numbers,
|
|
# plus, period and hyphen. Schemes are case-insensitive but we're being
|
|
# picky here and allowing only lowercase for autolinks.
|
|
#
|
|
# See http://en.wikipedia.org/wiki/URI_scheme
|
|
#
|
|
# The negative lookbehind ensures that users can paste a URL followed by a
|
|
# period or comma for punctuation without those characters being included
|
|
# in the generated link.
|
|
#
|
|
# Rubular: http://rubular.com/r/cxjPyZc7Sb
|
|
LINK_PATTERN = %r{([a-z][a-z0-9\+\.-]+://\S+)(?<!,|\.)}
|
|
|
|
# Text matching LINK_PATTERN inside these elements will not be linked
|
|
IGNORE_PARENTS = %w(a code kbd pre script style).to_set
|
|
|
|
def call
|
|
return doc if context[:autolink] == false
|
|
|
|
rinku_parse
|
|
text_parse
|
|
end
|
|
|
|
private
|
|
|
|
# Run the text through Rinku as a first pass
|
|
#
|
|
# This will quickly autolink http(s) and ftp links.
|
|
#
|
|
# `@doc` will be re-parsed with the HTML String from Rinku.
|
|
def rinku_parse
|
|
# Convert the options from a Hash to a String that Rinku expects
|
|
options = tag_options(link_options)
|
|
|
|
# NOTE: We don't parse email links because it will erroneously match
|
|
# external Commit and CommitRange references.
|
|
#
|
|
# The final argument tells Rinku to link short URLs that don't include a
|
|
# period (e.g., http://localhost:3000/)
|
|
rinku = Rinku.auto_link(html, :urls, options, IGNORE_PARENTS.to_a, 1)
|
|
|
|
# Rinku returns a String, so parse it back to a Nokogiri::XML::Document
|
|
# for further processing.
|
|
@doc = parse_html(rinku)
|
|
end
|
|
|
|
# Autolinks any text matching LINK_PATTERN that Rinku didn't already
|
|
# replace
|
|
def text_parse
|
|
search_text_nodes(doc).each do |node|
|
|
content = node.to_html
|
|
|
|
next if has_ancestor?(node, IGNORE_PARENTS)
|
|
next unless content.match(LINK_PATTERN)
|
|
|
|
# If Rinku didn't link this, there's probably a good reason, so we'll
|
|
# skip it too
|
|
next if content.start_with?(*%w(http https ftp))
|
|
|
|
html = autolink_filter(content)
|
|
|
|
next if html == content
|
|
|
|
node.replace(html)
|
|
end
|
|
|
|
doc
|
|
end
|
|
|
|
def autolink_filter(text)
|
|
text.gsub(LINK_PATTERN) do |match|
|
|
options = link_options.merge(href: match)
|
|
content_tag(:a, match, options)
|
|
end
|
|
end
|
|
|
|
def link_options
|
|
@link_options ||= context[:link_attr] || {}
|
|
end
|
|
end
|
|
end
|
|
end
|