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# frozen_string_literal: true
# Generated HTML is transformed back to GFM by app/assets/javascripts/behaviors/markdown/nodes/emoji.js
module Banzai
module Filter
# HTML filter that replaces :emoji: and unicode with images.
#
# Based on HTML::Pipeline::EmojiFilter
class EmojiFilter < HTML::Pipeline::Filter
IGNORED_ANCESTOR_TAGS = %w(pre code tt).to_set
def call
doc.xpath('descendant-or-self::text()').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 = Regexp.last_match(1)
emoji = TanukiEmoji.find_by_alpha_code(name)
Gitlab::Emoji.gl_emoji_tag(emoji)
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 = TanukiEmoji.find_by_codepoints(moji)
Gitlab::Emoji.gl_emoji_tag(emoji)
end
end
# Build a regexp that matches all valid :emoji: names.
def self.emoji_pattern
@emoji_pattern ||= TanukiEmoji.index.alpha_code_pattern
end
# Build a regexp that matches all valid unicode emojis names.
def self.emoji_unicode_pattern
@emoji_unicode_pattern ||= TanukiEmoji.index.codepoints_pattern
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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