Class: Usher::Grapher

Inherits:
Object
  • Object
show all
Defined in:
lib/usher/grapher.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(router) ⇒ Grapher

Returns a new instance of Grapher.



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# File 'lib/usher/grapher.rb', line 6

def initialize(router)
  @router = router
  reset!
end

Instance Attribute Details

#cache ⇒ Object (readonly)

Returns the value of attribute cache.



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# File 'lib/usher/grapher.rb', line 4

def cache
  @cache
end

#key_count ⇒ Object (readonly)

Returns the value of attribute key_count.



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# File 'lib/usher/grapher.rb', line 4

def key_count
  @key_count
end

#orders ⇒ Object (readonly)

Returns the value of attribute orders.



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# File 'lib/usher/grapher.rb', line 4

def orders
  @orders
end

#router ⇒ Object (readonly)

Returns the value of attribute router.



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# File 'lib/usher/grapher.rb', line 4

def router
  @router
end

#routes ⇒ Object (readonly)

Returns the value of attribute routes.



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# File 'lib/usher/grapher.rb', line 4

def routes
  @routes
end

Instance Method Details

#add_route(route) ⇒ Object 



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# File 'lib/usher/grapher.rb', line 19

def add_route(route)
  routes << route
end

#find_matching_path(params) ⇒ Object 



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# File 'lib/usher/grapher.rb', line 65

def find_matching_path(params)
  unless params.empty?
    process_routes
    set = params.keys & significant_keys
    if cached = cache[set] 
      return cached
    end
    set.size.downto(1) do |o|
      set.each do |k|
        orders[o][k].each do |r| 
          if r.can_generate_from_keys?(set)
            cache[set] = r
            return r
          elsif router.consider_destination_keys? && r.can_generate_from_params?(params)
            return r
          end
        end
      end
    end
  end
  nil
end

#process_routes ⇒ Object 



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# File 'lib/usher/grapher.rb', line 23

def process_routes
  return if @processed 
  routes.each do |route|
    route.paths.each do |path|
      if path.dynamic?
        path.dynamic_keys.each do |k|
          orders[path.dynamic_keys.size][k] << path
          key_count[k] += 1
        end

        dynamic_parts_with_defaults    = path.dynamic_parts.select{|part| part.default_value }.map{|dp| dp.name}
        dynamic_parts_without_defaults = path.dynamic_parts.select{|part| !part.default_value }.map{|dp| dp.name}

        (1...(2 ** (dynamic_parts_with_defaults.size))).each do |i|
          current_set = dynamic_parts_without_defaults.dup
          dynamic_parts_with_defaults.each_with_index do |dp, index|
            current_set << dp unless (index & i) == 0
          end

          current_set.each do |k|
            orders[current_set.size][k] << path
            key_count[k] += 1
          end
        end

      end

      if router.consider_destination_keys?
        path.route.destination_keys.each do |k|
          orders[path.route.destination_keys.size][k] << path
          key_count[k] += 1
        end
      end
    end
  end
  @processed = true
end

#reset! ⇒ Object 



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# File 'lib/usher/grapher.rb', line 11

def reset!
  @significant_keys = nil
  @orders = Hash.new{|h,k| h[k] = Hash.new{|h2, k2| h2[k2] = []}}
  @key_count = Hash.new(0)
  @cache = {}
  @routes = []
end

#significant_keys ⇒ Object 



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# File 'lib/usher/grapher.rb', line 61

def significant_keys
  @significant_keys ||= key_count.keys.uniq
end