1 files changed, 187 insertions, 0 deletions
diff --git a/actionpack/lib/action_view/template/template.rb b/actionpack/lib/action_view/template/template.rb
new file mode 100644
index 0000000000..0d2f201458
--- /dev/null
+++ b/actionpack/lib/action_view/template/template.rb
@@ -0,0 +1,187 @@
+require "action_view/template/path"
+
+module ActionView #:nodoc:
+  class Template
+    extend TemplateHandlers
+    extend ActiveSupport::Memoizable
+    
+    module Loading
+      def load!
+        @cached = true
+        # freeze
+      end    
+    end
+    include Loading    
+    
+    include Renderable
+
+    # Templates that are exempt from layouts
+    @@exempt_from_layout = Set.new([/\.rjs$/])
+
+    # Don't render layouts for templates with the given extensions.
+    def self.exempt_from_layout(*extensions)
+      regexps = extensions.collect do |extension|
+        extension.is_a?(Regexp) ? extension : /\.#{Regexp.escape(extension.to_s)}$/
+      end
+      @@exempt_from_layout.merge(regexps)
+    end
+
+    attr_accessor :template_path, :filename, :load_path, :base_path
+    attr_accessor :locale, :name, :format, :extension
+    delegate :to_s, :to => :path
+
+    def initialize(template_path, load_paths = [])
+      template_path = template_path.dup
+      @load_path, @filename = find_full_path(template_path, load_paths)
+      @base_path, @name, @locale, @format, @extension = split(template_path)
+      @base_path.to_s.gsub!(/\/$/, '') # Push to split method
+
+      # Extend with partial super powers
+      extend RenderablePartial if @name =~ /^_/
+    end
+    
+    def accessible_paths
+      paths = []
+
+      if valid_extension?(extension)
+        paths << path
+        paths << path_without_extension
+        if multipart?
+          formats = format.split(".")
+          paths << "#{path_without_format_and_extension}.#{formats.first}"
+          paths << "#{path_without_format_and_extension}.#{formats.second}"
+        end
+      else
+        # template without explicit template handler should only be reachable through its exact path
+        paths << template_path
+      end
+
+      paths
+    end
+    
+    def relative_path
+      path = File.expand_path(filename)
+      path.sub!(/^#{Regexp.escape(File.expand_path(RAILS_ROOT))}\//, '') if defined?(RAILS_ROOT)
+      path
+    end
+    memoize :relative_path
+    
+    def source
+      File.read(filename)
+    end
+    memoize :source
+    
+    def exempt_from_layout?
+      @@exempt_from_layout.any? { |exempted| path =~ exempted }
+    end    
+    
+    def path_without_extension
+      [base_path, [name, locale, format].compact.join('.')].compact.join('/')
+    end
+    memoize :path_without_extension    
+
+    def path_without_format_and_extension
+      [base_path, [name, locale].compact.join('.')].compact.join('/')
+    end
+    memoize :path_without_format_and_extension
+    
+    def path
+      [base_path, [name, locale, format, extension].compact.join('.')].compact.join('/')
+    end
+    memoize :path
+    
+    def mime_type
+      Mime::Type.lookup_by_extension(format) if format && defined?(::Mime)
+    end
+    memoize :mime_type      
+    
+    def multipart?
+      format && format.include?('.')
+    end    
+    
+    def content_type
+      format.gsub('.', '/')
+    end    
+    
+  private
+    
+    def format_and_extension
+      (extensions = [format, extension].compact.join(".")).blank? ? nil : extensions
+    end
+    memoize :format_and_extension
+
+    def mtime
+      File.mtime(filename)
+    end
+    memoize :mtime
+
+    def method_segment
+      relative_path.to_s.gsub(/([^a-zA-Z0-9_])/) { $1.ord }
+    end
+    memoize :method_segment
+
+    def stale?
+      File.mtime(filename) > mtime
+    end
+
+    def recompile?
+      !@cached
+    end
+
+    def valid_extension?(extension)
+      !Template.registered_template_handler(extension).nil?
+    end
+
+    def valid_locale?(locale)
+      I18n.available_locales.include?(locale.to_sym)
+    end
+
+    def find_full_path(path, load_paths)
+      load_paths = Array(load_paths) + [nil]
+      load_paths.each do |load_path|
+        file = load_path ? "#{load_path.to_str}/#{path}" : path
+        return load_path, file if File.file?(file)
+      end
+      raise MissingTemplate.new(load_paths, path)
+    end
+
+    # Returns file split into an array
+    #   [base_path, name, locale, format, extension]
+    def split(file)
+      if m = file.to_s.match(/^(.*\/)?([^\.]+)\.(.*)$/)
+        base_path = m[1]
+        name = m[2]
+        extensions = m[3]
+      else
+        return
+      end
+
+      locale = nil
+      format = nil
+      extension = nil
+
+      if m = extensions.split(".")
+        if valid_locale?(m[0]) && m[1] && valid_extension?(m[2]) # All three
+          locale = m[0]
+          format = m[1]
+          extension = m[2]
+        elsif m[0] && m[1] && valid_extension?(m[2]) # Multipart formats
+          format = "#{m[0]}.#{m[1]}"
+          extension = m[2]
+        elsif valid_locale?(m[0]) && valid_extension?(m[1]) # locale and extension
+          locale = m[0]
+          extension = m[1]
+        elsif valid_extension?(m[1]) # format and extension
+          format = m[0]
+          extension = m[1]
+        elsif valid_extension?(m[0]) # Just extension
+          extension = m[0]
+        else # No extension
+          format = m[0]
+        end
+      end
+
+      [base_path, name, locale, format, extension]
+    end
+  end
+end