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.

Attributes

filters[R]

page[R]

renderer[R]

Public Class Methods

new(renderer, page) click to toggle 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) click to toggle source

Process arguments through a single filter

# 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() click to toggle source

The name of the current filter

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

remaining_filters() click to toggle source

The list of filters yet to be processed

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

start_for(input) click to toggle 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