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Versions: 11
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Contents
module Pacer
class Route
class << self
# This method is useful for creating sideline routes that branch
# off of the current route.
#
# It creates a new route without any source based on the type,
# filters, function and extensions of the given route. The main
# thing about the returned route is that the pipeline that is
# built from it will not include any of the pipes that make up
# the route it's based on.
#
# @param [Route] back the route the new route is based on.
# @return [Route]
def empty(back)
back.chain_route :filter => :empty
end
def block_branch(back, block, branch_start = nil)
if block.arity == 0
route = block.call rescue nil
else
unless branch_start
if back.is_a? Pacer::Graph
branch_start = back
else
branch_start = Pacer::Route.empty(back)
end
end
route = block.call(branch_start) rescue nil
end
if route == branch_start
identity_branch(back).route
elsif route.is_a? Pacer::Route
route.route
else
empty(back).map(&block).route
end
end
def identity_branch(back)
Pacer::Route.empty(back).chain_route(:pipe_class => Pacer::Pipes::IdentityPipe,
:route_name => '@').route
end
end
end
module Filter
module EmptyFilter
protected
def after_initialize
@back = @source = nil
super
end
def build_pipeline
nil
end
def inspect_class_name
s = case element_type
when :vertex
'V'
when :edge
'E'
when :object
'Obj'
when :mixed
'Elem'
else
element_type.to_s.capitalize
end
s = "#{s} #{ @info }" if @info
s
end
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems