Merge pull request rails#50737 from skipkayhil/hm-further-optimize-tag-builder

Optimize TagBuilder tag generation

Author: byroot

actionview/lib/action_view/helpers/tag_helper.rb

@@ -52,7 +52,7 @@ def self.define_element(name, code_generator:, method_name: name.to_s.underscore
           code_generator.define_cached_method(method_name, namespace: :tag_builder) do |batch|
             batch.push(<<~RUBY) unless instance_methods.include?(method_name.to_sym)
               def #{method_name}(content = nil, escape: true, **options, &block)
-                tag_string(#{name.inspect}, content, escape: escape, **options, &block)
+                tag_string("#{name}", content, options, escape: escape, &block)
               end
             RUBY
           end
@@ -70,7 +70,7 @@ def #{method_name}(content = nil, escape: true, **options, &block)
                     positional argument will raise, and using a block will have
                     no effect.
                   TEXT
-                  tag_string("#{name}", content, escape: escape, **options, &block)
+                  tag_string("#{name}", content, options, escape: escape, &block)
                 else
                   self_closing_tag_string("#{name}", options, escape, ">")
                 end
@@ -84,7 +84,7 @@ def self.define_self_closing_element(name, code_generator:, method_name: name.to
             batch.push(<<~RUBY)
               def #{method_name}(content = nil, escape: true, **options, &block)
                 if content || block
-                  tag_string("#{name}", content, escape: escape, **options, &block)
+                  tag_string("#{name}", content, options, escape: escape, &block)
                 else
                   self_closing_tag_string("#{name}", options, escape)
                 end
@@ -239,7 +239,7 @@ def attributes(attributes)
           tag_options(attributes.to_h).to_s.strip.html_safe
         end
 
-        def tag_string(name, content = nil, escape: true, **options, &block)
+        def tag_string(name, content = nil, options, escape: true, &block)
           content = @view_context.capture(self, &block) if block
 
           content_tag_string(name, content, options, escape)
@@ -252,7 +252,7 @@ def self_closing_tag_string(name, options, escape = true, tag_suffix = " />")
         def content_tag_string(name, content, options, escape = true)
           tag_options = tag_options(options, escape) if options
 
-          if escape
+          if escape && content.present?
             content = ERB::Util.unwrapped_html_escape(content)
           end
           "<#{name}#{tag_options}>#{PRE_CONTENT_STRINGS[name]}#{content}</#{name}>".html_safe
@@ -334,12 +334,12 @@ def respond_to_missing?(*args)
             true
           end
 
-          def method_missing(called, ...)
+          def method_missing(called, *args, escape: true, **options, &block)
             name = called.name.dasherize
 
             TagHelper.ensure_valid_html5_tag_name(name)
 
-            tag_string(name, ...)
+            tag_string(name, *args, options, escape: escape, &block)
           end
       end
 

actionview/test/template/tag_helper_test.rb

@@ -45,7 +45,7 @@ def test_tag_builder_self_closing_tag
   end
 
   def test_tag_builder_self_closing_tag_with_content
-    assert_equal "<svg><circle><desc>A circle</desc></circle></svg>", tag.svg { tag.circle { tag.desc "A circle" } }
+    assert_equal "<svg><circle r=\"5\"><desc>A circle</desc></circle></svg>", tag.svg { tag.circle(r: "5") { tag.desc "A circle" } }
   end
 
   def test_tag_builder_defines_methods_to_build_html_elements