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