1 files changed, 88 insertions, 0 deletions
diff --git a/actionpack/lib/action_view/template_file.rb b/actionpack/lib/action_view/template_file.rb
new file mode 100644
index 0000000000..dd66482b3c
--- /dev/null
+++ b/actionpack/lib/action_view/template_file.rb
@@ -0,0 +1,88 @@
+module ActionView #:nodoc:
+  # TemplateFile abstracts the pattern of querying a file path for its
+  # path with or without its extension. The path is only the partial path
+  # from the load path root e.g. "hello/index.html.erb" not
+  # "app/views/hello/index.html.erb"
+  class TemplateFile
+    def self.from_path(path, use_full_path = false)
+      path.is_a?(self) ? path : new(path, use_full_path)
+    end
+
+    def self.from_full_path(load_path, full_path)
+      file = new(full_path.split(load_path).last)
+      file.load_path = load_path
+      file.freeze
+    end
+
+    attr_accessor :load_path, :base_path, :name, :format, :extension
+    delegate :to_s, :inspect, :to => :path
+
+    def initialize(path, use_full_path = false)
+      path = path.dup
+
+      # Clear the forward slash in the beginning unless using full path
+      trim_forward_slash!(path) unless use_full_path
+
+      @base_path, @name, @format, @extension = split(path)
+    end
+
+    def freeze
+      @load_path.freeze
+      @base_path.freeze
+      @name.freeze
+      @format.freeze
+      @extension.freeze
+      super
+    end
+
+    def format_and_extension
+      extensions = [format, extension].compact.join(".")
+      extensions.blank? ? nil : extensions
+    end
+
+    def full_path
+      if load_path
+        "#{load_path}/#{path}"
+      else
+        path
+      end
+    end
+
+    def path
+      base_path.to_s + [name, format, extension].compact.join(".")
+    end
+
+    def path_without_extension
+      base_path.to_s + [name, format].compact.join(".")
+    end
+
+    def path_without_format_and_extension
+      "#{base_path}#{name}"
+    end
+
+    def dup_with_extension(extension)
+      file = dup
+      file.extension = extension ? extension.to_s : nil
+      file
+    end
+
+    private
+      def trim_forward_slash!(path)
+        path.sub!(/^\//, '')
+      end
+
+      # Returns file split into an array
+      #   [base_path, name, format, extension]
+      def split(file)
+        if m = file.match(/^(.*\/)?(\w+)\.?(\w+)?\.?(\w+)?\.?(\w+)?$/)
+          if m[5] # Mulipart formats
+            [m[1], m[2], "#{m[3]}.#{m[4]}", m[5]]
+          elsif m[4] # Single format
+            [m[1], m[2], m[3], m[4]]
+          else # No format
+            [m[1], m[2], nil, m[3]]
+          end
+        end
+      end
+  end
+end