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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_unicode_element_unicode_filter(content)
html = emoji_name_element_unicode_filter(html)
next if html == content
node.replace(html)
end
doc
end
# Replace :emoji: with corresponding gl-emoji unicode.
#
# text - String text to replace :emoji: in.
#
# Returns a String with :emoji: replaced with gl-emoji unicode.
def emoji_name_element_unicode_filter(text)
text.gsub(emoji_pattern) do |match|
name = $1
Gitlab::Emoji.gl_emoji_tag(name)
end
end
# Replace unicode emoji with corresponding gl-emoji unicode.
#
# text - String text to replace unicode emoji in.
#
# Returns a String with unicode emoji replaced with gl-emoji unicode.
def emoji_unicode_element_unicode_filter(text)
text.gsub(emoji_unicode_pattern) do |moji|
emoji_info = Gitlab::Emoji.emojis_by_moji[moji]
Gitlab::Emoji.gl_emoji_tag(emoji_info['name'])
end
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_pattern
self.class.emoji_pattern
end
def emoji_unicode_pattern
self.class.emoji_unicode_pattern
end
end
end
end
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