Module: Webpacker::Routes

Defined in:
lib/webpacker/routes.rb,
lib/webpacker/routes/railtie.rb,
lib/webpacker/routes/version.rb

Defined Under Namespace

Classes: Engine

Constant Summary collapse

JAVASCRIPT_VARIABLE_NAME_REGEX = 
/\A[_$a-z][_$a-z0-9]*\z/i
IGNORED_OPTIONS = 
%i[controller action]
VERSION = 
'0.1.5'

Class Method Summary collapse

Class Method Details

.generate(app) ⇒ Object 



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# File 'lib/webpacker/routes.rb', line 16

def generate(app)
  config = app.config.webpacker.routes
  var_name = -> (name) { config.camel_case ? name.camelize(:lower) : name }

  default_url_options = app.default_url_options.dup
  default_url_options[:relative_url_root] = app.config.relative_url_root if app.config.relative_url_root
  default_url_options.merge!(config.default_url_options)
  default_url_options.except!(*IGNORED_OPTIONS)

  parent_spec_var = var_name.call('parent_spec')
  default_url_options_var = var_name.call('default_url_options')

  route_sets = [[app.routes, nil, Webpacker.config.routes_path]]
  visited_directories = []

  while (route_set, parent, directory = route_sets.shift)
    directory.mkpath
    visited_directories << directory
    js_file = directory.join('index.js')

    catch(:identical) do
      File.atomic_write(js_file) do |temp_file|
        parent_var_definition = if parent
          "import { #{parent} as #{parent_spec_var} } from '../'"
        else
          "const #{parent_spec_var} = null"
        end

        temp_file.write(<<-JAVASCRIPT.strip_heredoc)
          import { urlFor, pathFor } from 'webpacker-routes'
          #{parent_var_definition}
          const #{default_url_options_var} = #{js(default_url_options)}
        JAVASCRIPT

        route_set.named_routes.sort_by(&:first).each do |name, route|
          raise `Invalid route name for javascript: ${name}` unless JAVASCRIPT_VARIABLE_NAME_REGEX =~ name

          spec = route.path.spec.to_s
          segment_keys = route.segment_keys.uniq
          options = route.defaults.except(*IGNORED_OPTIONS)

          spec_var = var_name.call("#{name}_spec")
          url_var = var_name.call("#{name}_url")
          path_var = var_name.call("#{name}_path")

          temp_file.write(<<-JAVASCRIPT.strip_heredoc)
            export const #{spec_var} = [#{js(spec)}, #{js(segment_keys)}, { ...#{default_url_options_var}, ...#{js(options)} }, #{parent_spec_var}]
            export const #{url_var} = (...args) => urlFor(#{spec_var}, ...args)
            export const #{path_var} = (...args) => pathFor(#{spec_var}, ...args)
          JAVASCRIPT

          if engine?(route)
            engine = rack_app(route)
            engine_name = engine.railtie_name

            raise `Invalid engine name for javascript: ${engine_name}` unless JAVASCRIPT_VARIABLE_NAME_REGEX =~ engine_name

            engine_name_var = var_name.call(engine_name)

            route_sets << [engine.routes, spec_var, directory.join(engine_name_var)]
          end
        end

        temp_file.close
        if identical?(js_file.to_s, temp_file.path)
          temp_file.unlink
          throw :identical
        end
      end
    end
  end

  extra_directories = Webpacker.config.routes_path.glob('**/*').select(&:directory?) - visited_directories
  extra_directories.sort_by { |directory| directory.to_s.size }.reverse_each(&:rmtree)
end