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# frozen_string_literal: true
module Banzai
module Filter
class CustomEmojiFilter < HTML::Pipeline::Filter
include Gitlab::Utils::StrongMemoize
IGNORED_ANCESTOR_TAGS = %w(pre code tt).to_set
def call
return doc unless resource_parent
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?(':')
next unless has_custom_emoji?
html = custom_emoji_name_element_filter(content)
node.replace(html) unless html == content
end
doc
end
def custom_emoji_pattern
@emoji_pattern ||=
/(?<=[^[:alnum:]:]|\n|^)
:(#{CustomEmoji::NAME_REGEXP}):
(?=[^[:alnum:]:]|$)/x
end
def custom_emoji_name_element_filter(text)
text.gsub(custom_emoji_pattern) do |match|
name = Regexp.last_match[1]
custom_emoji = all_custom_emoji[name]
if custom_emoji
Gitlab::Emoji.custom_emoji_tag(custom_emoji.name, custom_emoji.url)
else
match
end
end
end
private
def has_custom_emoji?
strong_memoize(:has_custom_emoji) do
CustomEmoji.for_resource(resource_parent).any?
end
end
def resource_parent
context[:project] || context[:group]
end
def custom_emoji_candidates
doc.to_html.scan(/:(#{CustomEmoji::NAME_REGEXP}):/).flatten
end
def all_custom_emoji
@all_custom_emoji ||=
CustomEmoji.for_resource(resource_parent).by_name(custom_emoji_candidates).index_by(&:name)
end
end
end
end
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