gitlab-org--gitlab-foss/lib/gitlab/utils/nokogiri.rb

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# frozen_string_literal: true
module Gitlab
module Utils
class Nokogiri
class << self
# Use Nokogiri to convert a css selector into an xpath selector.
# Nokogiri can use css selectors with `doc.search()`. However
# for large node trees, it is _much_ slower than using xpath,
# by several orders of magnitude.
# https://gitlab.com/gitlab-org/gitlab/-/issues/329186
def css_to_xpath(css)
xpath = ::Nokogiri::CSS.xpath_for(css)
# Due to https://github.com/sparklemotion/nokogiri/issues/572,
# we remove the leading `//` and add `descendant-or-self::`
# in order to ensure we're searching from this node and all
# descendants.
xpath.map { |t| "descendant-or-self::#{t[2..-1]}" }.join('|')
end
end
end
end
end