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module ActionController
module Routing
# Much of the slow performance from routes comes from the
# complexity of expiry, :requirements matching, defaults providing
# and figuring out which url pattern to use. With named routes
# we can avoid the expense of finding the right route. So if
# they've provided the right number of arguments, and have no
# :requirements, we can just build up a string and return it.
#
# To support building optimisations for other common cases, the
# generation code is seperated into several classes
module Optimisation
def generate_optimisation_block(route, kind)
return "" unless route.optimise?
OPTIMISERS.inject("") do |memo, klazz|
memo << klazz.new(route, kind).source_code
memo
end
end
class Optimiser
attr_reader :route, :kind
def initialize(route, kind)
@route = route
@kind = kind
end
def guard_condition
'false'
end
def generation_code
'nil'
end
def source_code
if applicable?
"return #{generation_code} if #{guard_condition}\n"
else
"\n"
end
end
def applicable?
true
end
end
# Given a route:
# map.person '/people/:id'
#
# If the user calls person_url(@person), we can simply
# return a string like "/people/#{@person.to_param}"
# rather than triggering the expensive logic in url_for
class PositionalArguments < Optimiser
def guard_condition
number_of_arguments = route.segment_keys.size
# if they're using foo_url(:id=>2) it's one
# argument, but we don't want to generate /foos/id2
if number_of_arguments == 1
"args.size == 1 && !args.first.is_a?(Hash)"
else
"args.size == #{number_of_arguments}"
end
end
def generation_code
elements = []
idx = 0
if kind == :url
elements << '#{request.protocol}'
elements << '#{request.host_with_port}'
end
# The last entry in route.segments appears to # *always* be a
# 'divider segment' for '/' but we have assertions to ensure that
# we don't include the trailing slashes, so skip them.
((route.segments.size == 1 && kind == :path) ? route.segments : route.segments[0..-2]).each do |segment|
if segment.is_a?(DynamicSegment)
elements << segment.interpolation_chunk("args[#{idx}].to_param")
idx += 1
else
elements << segment.interpolation_chunk
end
end
%("#{elements * ''}")
end
end
# This case is mostly the same as the positional arguments case
# above, but it supports additional query parameters as the last
# argument
class PositionalArgumentsWithAdditionalParams < PositionalArguments
def guard_condition
"args.size == #{route.segment_keys.size + 1}"
end
# This case uses almost the Use the same code as positional arguments,
# but add an args.last.to_query on the end
def generation_code
super.insert(-2, '?#{args.last.to_query}')
end
# To avoid generating http://localhost/?host=foo.example.com we
# can't use this optimisation on routes without any segments
def applicable?
route.segment_keys.size > 0
end
end
OPTIMISERS = [PositionalArguments, PositionalArgumentsWithAdditionalParams]
end
end
end
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