rails--rails/actionpack/lib/action_view/template.rb

module ActionView #:nodoc:
  class Template #:nodoc:
    extend TemplateHandlers
    include Renderable

    attr_reader :path, :extension

    def initialize(view, path, use_full_path = nil, locals = {})
      unless use_full_path == nil
        ActiveSupport::Deprecation.warn("use_full_path option has been deprecated and has no affect.", caller)
      end

      @view = view
      @paths = view.view_paths

      @original_path = path
      @path = TemplateFile.from_path(path)
      @view.first_render ||= @path.to_s

      set_extension_and_file_name

      @method_segment = compiled_method_name_file_path_segment
      @locals = (locals && locals.dup) || {}
      @handler = self.class.handler_class_for_extension(@extension).new(@view)
    end

    def render_template
      render
    rescue Exception => e
      raise e unless filename
      if TemplateError === e
        e.sub_template_of(filename)
        raise e
      else
        raise TemplateError.new(self, @view.assigns, e)
      end
    end

    def source
      @source ||= File.read(@filename)
    end

    def base_path_for_exception
      (@paths.find_load_path_for_path(@path) || @paths.first).to_s
    end

    private
      def set_extension_and_file_name
        @extension = @path.extension

        unless @extension
          @path = @view.send(:template_file_from_name, @path)
          raise_missing_template_exception unless @path
          @extension = @path.extension
        end

        if p = @paths.find_template_file_for_path(path)
          @path = p
          @filename = @path.full_path
          @extension = @path.extension
          raise_missing_template_exception if @filename.blank?
        else
          @filename = @original_path
          raise_missing_template_exception unless File.exist?(@filename)
        end
      end

      def raise_missing_template_exception
        full_template_path = @original_path.include?('.') ? @original_path : "#{@original_path}.#{@view.template_format}.erb"
        display_paths = @paths.join(':')
        template_type = (@original_path =~ /layouts/i) ? 'layout' : 'template'
        raise MissingTemplate, "Missing #{template_type} #{full_template_path} in view path #{display_paths}"
      end

      def compiled_method_name_file_path_segment
        s = File.expand_path(@filename)
        s.sub!(/^#{Regexp.escape(File.expand_path(RAILS_ROOT))}/, '') if defined?(RAILS_ROOT)
        s.gsub!(/([^a-zA-Z0-9_])/) { $1.ord }
        s
      end
  end
end