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module Banzai
module Filter
# HTML filter that replaces :emoji: and unicode 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 if has_ancestor?(node, IGNORED_ANCESTOR_TAGS)
next unless content.include?(':') || node.text.match(emoji_unicode_pattern)
html = emoji_name_image_filter(content)
html = emoji_unicode_image_filter(html)
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_name_image_filter(text)
text.gsub(emoji_pattern) do |match|
name = $1
emoji_image_tag(name, emoji_url(name))
end
end
# Replace unicode emoji with corresponding images if they exist.
#
# text - String text to replace unicode emoji in.
#
# Returns a String with unicode emoji replaced with images.
def emoji_unicode_image_filter(text)
text.gsub(emoji_unicode_pattern) do |moji|
emoji_image_tag(Gitlab::Emoji.emojis_by_moji[moji]['name'], emoji_unicode_url(moji))
end
end
def emoji_image_tag(emoji_name, emoji_url)
"<img class='emoji' title=':#{emoji_name}:' alt=':#{emoji_name}:' src='#{emoji_url}' height='20' width='20' align='absmiddle' />"
end
# Build a regexp that matches all valid :emoji: names.
def self.emoji_pattern
@emoji_pattern ||= /:(#{Gitlab::Emoji.emojis_names.map { |name| Regexp.escape(name) }.join('|')}):/
end
# Build a regexp that matches all valid unicode emojis names.
def self.emoji_unicode_pattern
@emoji_unicode_pattern ||= /(#{Gitlab::Emoji.emojis_unicodes.map { |moji| Regexp.escape(moji) }.join('|')})/
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 emoji_unicode_url(moji)
emoji_unicode_path = emoji_unicode_filename(moji)
if context[:asset_host]
url_to_image(emoji_unicode_path)
elsif context[:asset_root]
File.join(context[:asset_root], url_to_image(emoji_unicode_path))
else
url_to_image(emoji_unicode_path)
end
end
def url_to_image(image)
ActionController::Base.helpers.url_to_image(image)
end
def emoji_pattern
self.class.emoji_pattern
end
def emoji_filename(name)
"#{Gitlab::Emoji.emoji_filename(name)}.png"
end
def emoji_unicode_pattern
self.class.emoji_unicode_pattern
end
def emoji_unicode_filename(name)
"#{Gitlab::Emoji.emoji_unicode_filename(name)}.png"
end
end
end
end
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