205 lines
7.8 KiB
Ruby
205 lines
7.8 KiB
Ruby
module ActionController
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module Routing
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class RouteBuilder #:nodoc:
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attr_accessor :separators, :optional_separators
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def initialize
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self.separators = Routing::SEPARATORS
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self.optional_separators = %w( / )
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end
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def separator_pattern(inverted = false)
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"[#{'^' if inverted}#{Regexp.escape(separators.join)}]"
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end
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def interval_regexp
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Regexp.new "(.*?)(#{separators.source}|$)"
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end
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def multiline_regexp?(expression)
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expression.options & Regexp::MULTILINE == Regexp::MULTILINE
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end
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# Accepts a "route path" (a string defining a route), and returns the array
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# of segments that corresponds to it. Note that the segment array is only
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# partially initialized--the defaults and requirements, for instance, need
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# to be set separately, via the #assign_route_options method, and the
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# #optional? method for each segment will not be reliable until after
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# #assign_route_options is called, as well.
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def segments_for_route_path(path)
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rest, segments = path, []
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until rest.empty?
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segment, rest = segment_for rest
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segments << segment
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end
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segments
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end
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# A factory method that returns a new segment instance appropriate for the
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# format of the given string.
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def segment_for(string)
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segment = case string
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when /\A:(\w+)/
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key = $1.to_sym
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case key
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when :controller then ControllerSegment.new(key)
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else DynamicSegment.new key
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end
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when /\A\*(\w+)/ then PathSegment.new($1.to_sym, :optional => true)
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when /\A\?(.*?)\?/
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returning segment = StaticSegment.new($1) do
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segment.is_optional = true
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end
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when /\A(#{separator_pattern(:inverted)}+)/ then StaticSegment.new($1)
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when Regexp.new(separator_pattern) then
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returning segment = DividerSegment.new($&) do
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segment.is_optional = (optional_separators.include? $&)
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end
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end
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[segment, $~.post_match]
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end
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# Split the given hash of options into requirement and default hashes. The
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# segments are passed alongside in order to distinguish between default values
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# and requirements.
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def divide_route_options(segments, options)
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options = options.dup
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if options[:namespace]
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options[:controller] = "#{options[:path_prefix]}/#{options[:controller]}"
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options.delete(:path_prefix)
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options.delete(:name_prefix)
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options.delete(:namespace)
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end
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requirements = (options.delete(:requirements) || {}).dup
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defaults = (options.delete(:defaults) || {}).dup
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conditions = (options.delete(:conditions) || {}).dup
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path_keys = segments.collect { |segment| segment.key if segment.respond_to?(:key) }.compact
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options.each do |key, value|
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hash = (path_keys.include?(key) && ! value.is_a?(Regexp)) ? defaults : requirements
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hash[key] = value
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end
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[defaults, requirements, conditions]
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end
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# Takes a hash of defaults and a hash of requirements, and assigns them to
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# the segments. Any unused requirements (which do not correspond to a segment)
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# are returned as a hash.
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def assign_route_options(segments, defaults, requirements)
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route_requirements = {} # Requirements that do not belong to a segment
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segment_named = Proc.new do |key|
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segments.detect { |segment| segment.key == key if segment.respond_to?(:key) }
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end
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requirements.each do |key, requirement|
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segment = segment_named[key]
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if segment
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raise TypeError, "#{key}: requirements on a path segment must be regular expressions" unless requirement.is_a?(Regexp)
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if requirement.source =~ %r{\A(\\A|\^)|(\\Z|\\z|\$)\Z}
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raise ArgumentError, "Regexp anchor characters are not allowed in routing requirements: #{requirement.inspect}"
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end
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if multiline_regexp?(requirement)
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raise ArgumentError, "Regexp multiline option not allowed in routing requirements: #{requirement.inspect}"
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end
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segment.regexp = requirement
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else
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route_requirements[key] = requirement
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end
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end
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defaults.each do |key, default|
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segment = segment_named[key]
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raise ArgumentError, "#{key}: No matching segment exists; cannot assign default" unless segment
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segment.is_optional = true
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segment.default = default.to_param if default
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end
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assign_default_route_options(segments)
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ensure_required_segments(segments)
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route_requirements
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end
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# Assign default options, such as 'index' as a default for <tt>:action</tt>. This
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# method must be run *after* user supplied requirements and defaults have
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# been applied to the segments.
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def assign_default_route_options(segments)
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segments.each do |segment|
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next unless segment.is_a? DynamicSegment
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case segment.key
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when :action
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if segment.regexp.nil? || segment.regexp.match('index').to_s == 'index'
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segment.default ||= 'index'
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segment.is_optional = true
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end
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when :id
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if segment.default.nil? && segment.regexp.nil? || segment.regexp =~ ''
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segment.is_optional = true
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end
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end
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end
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end
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# Makes sure that there are no optional segments that precede a required
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# segment. If any are found that precede a required segment, they are
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# made required.
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def ensure_required_segments(segments)
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allow_optional = true
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segments.reverse_each do |segment|
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allow_optional &&= segment.optional?
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if !allow_optional && segment.optional?
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unless segment.optionality_implied?
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warn "Route segment \"#{segment.to_s}\" cannot be optional because it precedes a required segment. This segment will be required."
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end
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segment.is_optional = false
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elsif allow_optional && segment.respond_to?(:default) && segment.default
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# if a segment has a default, then it is optional
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segment.is_optional = true
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end
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end
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end
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# Construct and return a route with the given path and options.
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def build(path, options)
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# Wrap the path with slashes
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path = "/#{path}" unless path[0] == ?/
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path = "#{path}/" unless path[-1] == ?/
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path = "/#{options[:path_prefix].to_s.gsub(/^\//,'')}#{path}" if options[:path_prefix]
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segments = segments_for_route_path(path)
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defaults, requirements, conditions = divide_route_options(segments, options)
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requirements = assign_route_options(segments, defaults, requirements)
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route = Route.new
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route.segments = segments
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route.requirements = requirements
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route.conditions = conditions
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if !route.significant_keys.include?(:action) && !route.requirements[:action]
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route.requirements[:action] = "index"
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route.significant_keys << :action
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end
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# Routes cannot use the current string interpolation method
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# if there are user-supplied <tt>:requirements</tt> as the interpolation
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# code won't raise RoutingErrors when generating
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if options.key?(:requirements) || route.requirements.keys.to_set != Routing::ALLOWED_REQUIREMENTS_FOR_OPTIMISATION
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route.optimise = false
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end
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if !route.significant_keys.include?(:controller)
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raise ArgumentError, "Illegal route: the :controller must be specified!"
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end
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route
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end
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end
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end
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end
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