class Nokogiri::VersionInfo

def to_hash
  header_directory = File.expand_path(File.join(File.dirname(__FILE__), "../../../ext/nokogiri"))
  {}.tap do |vi|
    vi["warnings"] = []
    vi["nokogiri"] = {}.tap do |nokogiri|
      nokogiri["version"] = Nokogiri::VERSION
      unless jruby?
        #  enable gems to build against Nokogiri with the following in their extconf.rb:
        #
        #    append_cflags(Nokogiri::VERSION_INFO["nokogiri"]["cppflags"])
        #    append_ldflags(Nokogiri::VERSION_INFO["nokogiri"]["ldflags"])
        #
        #  though, this won't work on all platform and versions of Ruby, and won't be supported
        #  forever, see https://github.com/sparklemotion/nokogiri/discussions/2746 for context.
        #
        cppflags = ["-I#{header_directory.shellescape}"]
        ldflags = []
        if libxml2_using_packaged?
          cppflags << "-I#{File.join(header_directory, "include").shellescape}"
          cppflags << "-I#{File.join(header_directory, "include/libxml2").shellescape}"
        end
        if windows?
          # on windows, third party libraries that wish to link against nokogiri
          # should link against nokogiri.so to resolve symbols. see #2167
          lib_directory = File.expand_path(File.join(File.dirname(__FILE__), "../#{ruby_minor}"))
          unless File.exist?(lib_directory)
            lib_directory = File.expand_path(File.join(File.dirname(__FILE__), ".."))
          end
          ldflags << "-L#{lib_directory.shellescape}"
          ldflags << "-l:nokogiri.so"
        end
        nokogiri["cppflags"] = cppflags
        nokogiri["ldflags"] = ldflags
      end
    end
    vi["ruby"] = {}.tap do |ruby|
      ruby["version"] = ::RUBY_VERSION
      ruby["platform"] = ::RUBY_PLATFORM
      ruby["gem_platform"] = ::Gem::Platform.local.to_s
      ruby["description"] = ::RUBY_DESCRIPTION
      ruby["engine"] = engine
      ruby["jruby"] = jruby? if jruby?
    end
    if libxml2?
      vi["libxml"] = {}.tap do |libxml|
        if libxml2_using_packaged?
          libxml["source"] = "packaged"
          libxml["precompiled"] = libxml2_precompiled?
          libxml["patches"] = Nokogiri::LIBXML2_PATCHES
        else
          libxml["source"] = "system"
        end
        libxml["memory_management"] = Nokogiri::LIBXML_MEMORY_MANAGEMENT
        libxml["iconv_enabled"] = libxml2_has_iconv?
        libxml["compiled"] = compiled_libxml_version.to_s
        libxml["loaded"] = loaded_libxml_version.to_s
      end
      vi["libxslt"] = {}.tap do |libxslt|
        if libxml2_using_packaged?
          libxslt["source"] = "packaged"
          libxslt["precompiled"] = libxml2_precompiled?
          libxslt["patches"] = Nokogiri::LIBXSLT_PATCHES
        else
          libxslt["source"] = "system"
        end
        libxslt["datetime_enabled"] = libxslt_has_datetime?
        libxslt["compiled"] = compiled_libxslt_version.to_s
        libxslt["loaded"] = loaded_libxslt_version.to_s
      end
      vi["warnings"] = warnings
    end
    if defined?(Nokogiri::OTHER_LIBRARY_VERSIONS)
      # see extconf for how this string is assembled: "lib1name:lib1version,lib2name:lib2version"
      vi["other_libraries"] = Hash[*Nokogiri::OTHER_LIBRARY_VERSIONS.split(/[,:]/)]
    elsif jruby?
      vi["other_libraries"] = {}.tap do |ol|
        Nokogiri::JAR_DEPENDENCIES.each do |k, v|
          ol[k] = v
        end
      end
    end
  end
end