push kwargs up to the user facing API

this lets us leverage Ruby's kwarg handling (exceptions for missing
params, etc) ASAP which allows us to skip active support method calls
and make sure the exception stack is closer to where the user called the
methods.

actionview/lib/action_view/digestor.rb

@@ -22,23 +22,23 @@ class << self
       # * <tt>finder</tt>  - An instance of <tt>ActionView::LookupContext</tt>
       # * <tt>dependencies</tt>  - An array of dependent views
       # * <tt>partial</tt>  - Specifies whether the template is a partial
-      def digest(options)
-        options.assert_valid_keys(:name, :finder, :dependencies, :partial)
+      def digest(name:, finder:, **options)
+        options.assert_valid_keys(:dependencies, :partial)
 
-        cache_key = ([ options[:name], options[:finder].details_key.hash ].compact + Array.wrap(options[:dependencies])).join('.')
+        cache_key = ([ name, finder.details_key.hash ].compact + Array.wrap(options[:dependencies])).join('.')
 
         # this is a correctly done double-checked locking idiom
         # (Concurrent::Map's lookups have volatile semantics)
         @@cache[cache_key] || @@digest_monitor.synchronize do
           @@cache.fetch(cache_key) do # re-check under lock
-            compute_and_store_digest(cache_key, options)
+            compute_and_store_digest(cache_key, name, finder, options)
           end
         end
       end
 
       private
-        def compute_and_store_digest(cache_key, options) # called under @@digest_monitor lock
-          klass = if options[:partial] || options[:name].include?("/_")
+        def compute_and_store_digest(cache_key, name, finder, options) # called under @@digest_monitor lock
+          klass = if options[:partial] || name.include?("/_")
             # Prevent re-entry or else recursive templates will blow the stack.
             # There is no need to worry about other threads seeing the +false+ value,
             # as they will then have to wait for this thread to let go of the @@digest_monitor lock.
@@ -48,7 +48,7 @@ def compute_and_store_digest(cache_key, options) # called under @@digest_monitor
             Digestor
           end
 
-          @@cache[cache_key] = stored_digest = klass.new(options).digest
+          @@cache[cache_key] = stored_digest = klass.new(name, finder, options).digest
         ensure
           # something went wrong or ActionView::Resolver.caching? is false, make sure not to corrupt the @@cache
           @@cache.delete_pair(cache_key, false) if pre_stored && !stored_digest
@@ -57,7 +57,7 @@ def compute_and_store_digest(cache_key, options) # called under @@digest_monitor
 
     attr_reader :name, :finder, :options
 
-    def initialize(name:, finder:, **options)
+    def initialize(name, finder, options = {})
       @name, @finder = name, finder
       @options = options
     end
@@ -80,7 +80,7 @@ def dependencies
 
     def nested_dependencies
       dependencies.collect do |dependency|
-        dependencies = PartialDigestor.new(name: dependency, finder: finder).nested_dependencies
+        dependencies = PartialDigestor.new(dependency, finder).nested_dependencies
         dependencies.any? ? { dependency => dependencies } : dependency
       end
     end

actionview/lib/action_view/tasks/dependencies.rake

@@ -2,13 +2,13 @@ namespace :cache_digests do
   desc 'Lookup nested dependencies for TEMPLATE (like messages/show or comments/_comment.html)'
   task :nested_dependencies => :environment do
     abort 'You must provide TEMPLATE for the task to run' unless ENV['TEMPLATE'].present?
-    puts JSON.pretty_generate ActionView::Digestor.new(name: CacheDigests.template_name, finder: CacheDigests.finder).nested_dependencies
+    puts JSON.pretty_generate ActionView::Digestor.new(CacheDigests.template_name, CacheDigests.finder).nested_dependencies
   end
 
   desc 'Lookup first-level dependencies for TEMPLATE (like messages/show or comments/_comment.html)'
   task :dependencies => :environment do
     abort 'You must provide TEMPLATE for the task to run' unless ENV['TEMPLATE'].present?
-    puts JSON.pretty_generate ActionView::Digestor.new(name: CacheDigests.template_name, finder: CacheDigests.finder).dependencies
+    puts JSON.pretty_generate ActionView::Digestor.new(CacheDigests.template_name, CacheDigests.finder).dependencies
   end
 
   class CacheDigests

actionview/test/template/digestor_test.rb

@@ -308,11 +308,11 @@ def digest(template_name, options = {})
     end
 
     def dependencies(template_name)
-      ActionView::Digestor.new({ name: template_name, finder: finder }).dependencies
+      ActionView::Digestor.new(template_name, finder).dependencies
     end
 
     def nested_dependencies(template_name)
-      ActionView::Digestor.new({ name: template_name, finder: finder }).nested_dependencies
+      ActionView::Digestor.new(template_name, finder).nested_dependencies
     end
 
     def finder