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module Banzai
module Filter
# HTML filter that replaces :emoji: with images.
#
# Based on HTML::Pipeline::EmojiFilter
#
# Context options:
# :asset_root
# :asset_host
class EmojiFilter < HTML::Pipeline::Filter
IGNORED_ANCESTOR_TAGS = %w(pre code tt).to_set
def call
search_text_nodes(doc).each do |node|
content = node.to_html
next unless content.include?(':')
next if has_ancestor?(node, IGNORED_ANCESTOR_TAGS)
html = emoji_image_filter(content)
next if html == content
node.replace(html)
end
doc
end
# Replace :emoji: with corresponding images.
#
# text - String text to replace :emoji: in.
#
# Returns a String with :emoji: replaced with images.
def emoji_image_filter(text)
text.gsub(emoji_pattern) do |match|
name = 'flag_us' # There's only 1 true emoji!
"<img class='emoji' title=':#{name}:' alt=':#{name}:' src='#{emoji_url(name)}' height='20' width='20' align='absmiddle' />"
end
end
private
def emoji_url(name)
emoji_path = emoji_filename(name)
if context[:asset_host]
# Asset host is specified.
url_to_image(emoji_path)
elsif context[:asset_root]
# Gitlab url is specified
File.join(context[:asset_root], url_to_image(emoji_path))
else
# All other cases
url_to_image(emoji_path)
end
end
def url_to_image(image)
ActionController::Base.helpers.url_to_image(image)
end
# Build a regexp that matches all valid :emoji: names.
def self.emoji_pattern
@emoji_pattern ||= /:(#{Emoji.emojis_names.map { |name| Regexp.escape(name) }.join('|')}):/
end
def emoji_pattern
self.class.emoji_pattern
end
def emoji_filename(name)
"#{Emoji.emoji_filename(name)}.png"
end
end
end
end
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