/usr/lib/ruby/vendor_ruby/action_controller/routing/optimisations.rb is in ruby-actionpack-2.3 2.3.14-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 | module ActionController
module Routing
# Much of the slow performance from routes comes from the
# complexity of expiry, <tt>:requirements</tt> 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
# <tt>:requirements</tt>, we can just build up a string and return it.
#
# To support building optimisations for other common cases, the
# generation code is separated 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
GLOBAL_GUARD_CONDITIONS = [
"(!defined?(default_url_options) || default_url_options.blank?)",
"(!defined?(controller.default_url_options) || controller.default_url_options.blank?)",
"defined?(request)",
"request"
]
def initialize(route, kind)
@route = route
@kind = kind
end
def guard_conditions
["false"]
end
def generation_code
'nil'
end
def source_code
if applicable?
guard_condition = (GLOBAL_GUARD_CONDITIONS + guard_conditions).join(" && ")
"return #{generation_code} if #{guard_condition}\n"
else
"\n"
end
end
# Temporarily disabled <tt>:url</tt> optimisation pending proper solution to
# Issues around request.host etc.
def applicable?
true
end
end
# Given a route
#
# map.person '/people/:id'
#
# If the user calls <tt>person_url(@person)</tt>, 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_conditions
number_of_arguments = route.required_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
elements << '#{ActionController::Base.relative_url_root if ActionController::Base.relative_url_root}'
# The last entry in <tt>route.segments</tt> 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 ? 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_conditions
["args.size == #{route.segment_keys.size + 1}"] +
UrlRewriter::RESERVED_OPTIONS.collect{ |key| "!args.last.has_key?(:#{key})" }
end
# This case uses almost the same code as positional arguments,
# but add a question mark and args.last.to_query on the end,
# unless the last arg is empty
def generation_code
super.insert(-2, '#{\'?\' + args.last.to_query unless args.last.empty?}')
end
# To avoid generating "http://localhost/?host=foo.example.com" we
# can't use this optimisation on routes without any segments
def applicable?
super && route.segment_keys.size > 0
end
end
OPTIMISERS = [PositionalArguments, PositionalArgumentsWithAdditionalParams]
end
end
end
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