Class: Webby::Filters::Cursor

Instances of this class handle processing a set of filters for a given renderer and page. Note: The instance is passed as the second argument to filters

      that require two parameters and can be used to access
      information on the renderer, page, or filters being
      processed.

Methods

_handle current_filter new remaining_filters start_for

Attributes

 filters
 page
 renderer

Public Class methods

new(renderer, page)

[Source]

# File lib/webby/filters.rb, line 36
      def initialize(renderer, page)
        @renderer, @page = renderer, page
        @filters = Array(page.filter)
        @log = Logging::Logger[Webby::Renderer]
        @processed = 0
        @prev_cursor = nil
      end

Public Instance methods

_handle(filter, handler, *args)

Process arguments through a single filter

[Source]

# File lib/webby/filters.rb, line 69
      def _handle(filter, handler, *args)
        result = handler.call(*args)
        @processed += 1
        result
      rescue StandardError => err
        raise ::Webby::Error, "#{filter} filter error: #{err.message.inspect}"
      end

current_filter()

The name of the current filter

[Source]

# File lib/webby/filters.rb, line 64
      def current_filter
        filters[@processed]
      end

remaining_filters()

The list of filters yet to be processed

[Source]

# File lib/webby/filters.rb, line 59
      def remaining_filters
        filters[@processed..-1]
      end

start_for(input)

[Source]

# File lib/webby/filters.rb, line 44
      def start_for(input)
        @prev_cursor = @renderer.instance_variable_get(:@_cursor)
        @renderer.instance_variable_set(:@_cursor, self)
        filters.inject(input) do |result, filter|
          handler = Filters[filter]
          raise ::Webby::Error, "unknown filter: #{filter.inspect}" if handler.nil?

          args = [result, self][0, handler.arity]
          _handle(filter, handler, *args)
        end
      ensure
        @renderer.instance_variable_set(:@_cursor, @prev_cursor)
      end