Extract TextFieldTag

actionpack/lib/action_view/helpers/form_helper.rb

@@ -677,7 +677,7 @@ def label(object_name, method, content_or_options = nil, options = nil, &block)
       #   # => <input type="text" id="snippet_code" name="snippet[code]" size="20" value="#{@snippet.code}" class="code_input" />
       #
       def text_field(object_name, method, options = {})
-        InstanceTag.new(object_name, method, self, options.delete(:object)).to_input_field_tag("text", options)
+        ActionView::Helpers::Tags::TextFieldTag.new(object_name, method, self, options).render
       end
 
       # Returns an input tag of the "password" type tailored for accessing a specified attribute (identified by +method+) on an object

actionpack/lib/action_view/helpers/tags.rb

 module ActionView
   module Helpers
     module Tags
-      autoload :LabelTag, 'action_view/helpers/tags/label_tag'
+      autoload :LabelTag,     'action_view/helpers/tags/label_tag'
+      autoload :TextFieldTag, 'action_view/helpers/tags/text_field_tag'
     end
   end
 end

actionpack/lib/action_view/helpers/tags/text_field_tag.rb

+module ActionView
+  module Helpers
+    module Tags
+      class TextFieldTag
+        include Helpers::ActiveModelInstanceTag, Helpers::TagHelper, Helpers::FormTagHelper
+
+        DEFAULT_FIELD_OPTIONS = { "size" => 30 }
+
+        attr_reader :object
+
+        def initialize(object_name, method_name, template_object, options = {})
+          @object_name, @method_name = object_name.to_s.dup, method_name.to_s.dup
+          @template_object = template_object
+
+          @object_name.sub!(/\[\]$/,"") || @object_name.sub!(/\[\]\]$/,"]")
+          @object = retrieve_object(options.delete(:object))
+          @options = options
+          @auto_index = retrieve_autoindex(Regexp.last_match.pre_match) if Regexp.last_match
+        end
+
+        def render(&block)
+          options = @options.stringify_keys
+          options["size"] = options["maxlength"] || DEFAULT_FIELD_OPTIONS["size"] unless options.key?("size")
+          options = DEFAULT_FIELD_OPTIONS.merge(options)
+          options["type"]  ||= "text"
+          options["value"] = options.fetch("value"){ value_before_type_cast(object) }
+          options["value"] &&= ERB::Util.html_escape(options["value"])
+          add_default_name_and_id(options)
+          tag("input", options)
+        end
+
+        private
+
+        def value_before_type_cast(object)
+          unless object.nil?
+            object.respond_to?(@method_name + "_before_type_cast") ?
+            object.send(@method_name + "_before_type_cast") :
+            object.send(@method_name)
+          end
+        end
+
+        def retrieve_object(object)
+          if object
+            object
+          elsif @template_object.instance_variable_defined?("@#{@object_name}")
+            @template_object.instance_variable_get("@#{@object_name}")
+          end
+        rescue NameError
+          # As @object_name may contain the nested syntax (item[subobject]) we need to fallback to nil.
+          nil
+        end
+
+        def retrieve_autoindex(pre_match)
+          object = self.object || @template_object.instance_variable_get("@#{pre_match}")
+          if object && object.respond_to?(:to_param)
+            object.to_param
+          else
+            raise ArgumentError, "object[] naming but object param and @object var don't exist or don't respond to to_param: #{object.inspect}"
+          end
+        end
+
+        def add_default_name_and_id_for_value(tag_value, options)
+          unless tag_value.nil?
+            pretty_tag_value = tag_value.to_s.gsub(/\s/, "_").gsub(/[^-\w]/, "").downcase
+            specified_id = options["id"]
+            add_default_name_and_id(options)
+            options["id"] += "_#{pretty_tag_value}" if specified_id.blank? && options["id"].present?
+          else
+            add_default_name_and_id(options)
+          end
+        end
+
+        def add_default_name_and_id(options)
+          if options.has_key?("index")
+            options["name"] ||= tag_name_with_index(options["index"])
+            options["id"] = options.fetch("id"){ tag_id_with_index(options["index"]) }
+            options.delete("index")
+          elsif defined?(@auto_index)
+            options["name"] ||= tag_name_with_index(@auto_index)
+            options["id"] = options.fetch("id"){ tag_id_with_index(@auto_index) }
+          else
+            options["name"] ||= tag_name + (options['multiple'] ? '[]' : '')
+            options["id"] = options.fetch("id"){ tag_id }
+          end
+          options["id"] = [options.delete('namespace'), options["id"]].compact.join("_").presence
+        end
+
+        def tag_name
+          "#{@object_name}[#{sanitized_method_name}]"
+        end
+
+        def tag_name_with_index(index)
+          "#{@object_name}[#{index}][#{sanitized_method_name}]"
+        end
+
+        def tag_id
+          "#{sanitized_object_name}_#{sanitized_method_name}"
+        end
+
+        def tag_id_with_index(index)
+          "#{sanitized_object_name}_#{index}_#{sanitized_method_name}"
+        end
+
+        def sanitized_object_name
+          @sanitized_object_name ||= @object_name.gsub(/\]\[|[^-a-zA-Z0-9:.]/, "_").sub(/_$/, "")
+        end
+
+        def sanitized_method_name
+          @sanitized_method_name ||= @method_name.sub(/\?$/,"")
+        end
+      end
+    end
+  end
+end