Class: Importmap::Map

Inherits:
Object
  • Object
show all
Defined in:
lib/importmap/map.rb

Defined Under Namespace

Classes: InvalidFile, MappedDir, MappedFile

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Map

Returns a new instance of Map.



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# File 'lib/importmap/map.rb', line 8

def initialize
  @packages, @directories = {}, {}
  @cache = {}
end

Instance Attribute Details

#directories ⇒ Object (readonly)

Returns the value of attribute directories.



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# File 'lib/importmap/map.rb', line 4

def directories
  @directories
end

#packages ⇒ Object (readonly)

Returns the value of attribute packages.



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# File 'lib/importmap/map.rb', line 4

def packages
  @packages
end

Instance Method Details

#cache_sweeper(watches: nil) ⇒ Object

Returns an instance of ActiveSupport::EventedFileUpdateChecker configured to clear the cache of the map when the directories passed on initialization via ‘watches:` have changes. This is used in development and test to ensure the map caches are reset when javascript files are changed.



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# File 'lib/importmap/map.rb', line 75

def cache_sweeper(watches: nil)
  if watches
    @cache_sweeper =
      Rails.application.config.file_watcher.new([], Array(watches).collect { |dir| [ dir.to_s, "js"] }.to_h) do
        clear_cache
      end
  else
    @cache_sweeper
  end
end

#digest(resolver:) ⇒ Object

Returns a SHA1 digest of the import map json that can be used as a part of a page etag to ensure that a html cache is invalidated when the import map is changed.

Example:

class ApplicationController < ActionController::Base
  etag { Rails.application.importmap.digest(resolver: helpers) if request.format&.html? }
end



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# File 'lib/importmap/map.rb', line 68

def digest(resolver:)
  Digest::SHA1.hexdigest(to_json(resolver: resolver).to_s)
end

#draw(path = nil, &block) ⇒ Object 



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# File 'lib/importmap/map.rb', line 13

def draw(path = nil, &block)
  if path && File.exist?(path)
    begin
      instance_eval(File.read(path), path.to_s)
    rescue StandardError => e
      Rails.logger.error "Unable to parse import map from #{path}: #{e.message}"
      raise InvalidFile, "Unable to parse import map from #{path}: #{e.message}"
    end
  elsif block_given?
    instance_eval(&block)
  end

  self
end

#pin(name, to: nil, preload: true) ⇒ Object 



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# File 'lib/importmap/map.rb', line 28

def pin(name, to: nil, preload: true)
  clear_cache
  @packages[name] = MappedFile.new(name: name, path: to || "#{name}.js", preload: preload)
end

#pin_all_from(dir, under: nil, to: nil, preload: true) ⇒ Object 



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# File 'lib/importmap/map.rb', line 33

def pin_all_from(dir, under: nil, to: nil, preload: true)
  clear_cache
  @directories[dir] = MappedDir.new(dir: dir, under: under, path: to, preload: preload)
end

#preloaded_module_paths(resolver:, entry_point: "application", cache_key: :preloaded_module_paths) ⇒ Object

Returns an array of all the resolved module paths of the pinned packages. The ‘resolver` must respond to `path_to_asset`, such as `ActionController::Base.helpers` or `ApplicationController.helpers`. You’ll want to use the resolver that has been configured for the ‘asset_host` you want these resolved paths to use. In case you need to resolve for different asset hosts, you can pass in a custom `cache_key` to vary the cache used by this method for the different cases.



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# File 'lib/importmap/map.rb', line 43

def preloaded_module_paths(resolver:, entry_point: "application", cache_key: :preloaded_module_paths)
  cache_as(cache_key) do
    resolve_asset_paths(expanded_preloading_packages_and_directories(entry_point:), resolver:).values
  end
end

#to_json(resolver:, cache_key: :json) ⇒ Object

Returns a JSON hash (as a string) of all the resolved module paths of the pinned packages in the import map format. The ‘resolver` must respond to `path_to_asset`, such as `ActionController::Base.helpers` or `ApplicationController.helpers`. You’ll want to use the resolver that has been configured for the ‘asset_host` you want these resolved paths to use. In case you need to resolve for different asset hosts, you can pass in a custom `cache_key` to vary the cache used by this method for the different cases.



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# File 'lib/importmap/map.rb', line 54

def to_json(resolver:, cache_key: :json)
  cache_as(cache_key) do
    JSON.pretty_generate({ "imports" => resolve_asset_paths(expanded_packages_and_directories, resolver: resolver) })
  end
end