1 files changed, 56 insertions, 0 deletions
diff --git a/actionview/lib/action_view/renderer/renderer.rb b/actionview/lib/action_view/renderer/renderer.rb
new file mode 100644
index 0000000000..3f3a97529d
--- /dev/null
+++ b/actionview/lib/action_view/renderer/renderer.rb
@@ -0,0 +1,56 @@
+# frozen_string_literal: true
+
+module ActionView
+  # This is the main entry point for rendering. It basically delegates
+  # to other objects like TemplateRenderer and PartialRenderer which
+  # actually renders the template.
+  #
+  # The Renderer will parse the options from the +render+ or +render_body+
+  # method and render a partial or a template based on the options. The
+  # +TemplateRenderer+ and +PartialRenderer+ objects are wrappers which do all
+  # the setup and logic necessary to render a view and a new object is created
+  # each time +render+ is called.
+  class Renderer
+    attr_accessor :lookup_context
+
+    def initialize(lookup_context)
+      @lookup_context = lookup_context
+    end
+
+    # Main render entry point shared by Action View and Action Controller.
+    def render(context, options)
+      if options.key?(:partial)
+        render_partial(context, options)
+      else
+        render_template(context, options)
+      end
+    end
+
+    # Render but returns a valid Rack body. If fibers are defined, we return
+    # a streaming body that renders the template piece by piece.
+    #
+    # Note that partials are not supported to be rendered with streaming,
+    # so in such cases, we just wrap them in an array.
+    def render_body(context, options)
+      if options.key?(:partial)
+        [render_partial(context, options)]
+      else
+        StreamingTemplateRenderer.new(@lookup_context).render(context, options)
+      end
+    end
+
+    # Direct access to template rendering.
+    def render_template(context, options) #:nodoc:
+      TemplateRenderer.new(@lookup_context).render(context, options)
+    end
+
+    # Direct access to partial rendering.
+    def render_partial(context, options, &block) #:nodoc:
+      PartialRenderer.new(@lookup_context).render(context, options, block)
+    end
+
+    def cache_hits # :nodoc:
+      @cache_hits ||= {}
+    end
+  end
+end