/usr/lib/ruby/vendor_ruby/merb-core/dispatch/router/route.rb is in ruby-merb-core 1.1.3+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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class Router
# This entire class is private and should never be accessed outside of
# Merb::Router and Behavior
class Route #:nodoc:
SEGMENT_REGEXP = /(:([a-z](_?[a-z0-9])*))/
OPTIONAL_SEGMENT_REGEX = /^.*?([\(\)])/i
SEGMENT_REGEXP_WITH_BRACKETS = /(:[a-z_]+)(\[(\d+)\])?/
JUST_BRACKETS = /\[(\d+)\]/
SEGMENT_CHARACTERS = "[^\/.,;?]".freeze
# :api: private
attr_reader :conditions, :params, :segments
# :api: private
attr_reader :index, :variables, :name
# :api: private
attr_accessor :fixation, :resource_identifiers
# :api: private
def initialize(conditions, params, deferred_procs, options = {})
@conditions, @params = conditions, params
if options[:redirects]
@redirects = true
@redirect_status = @params[:status]
@redirect_url = @params[:url]
@defaults = {}
else
@generatable = true
@defaults = options[:defaults] || {}
end
@identifiers = options[:identifiers]
@deferred_procs = deferred_procs
@segments = []
@symbol_conditions = {}
@placeholders = {}
compile
end
# :api: private
def regexp?
@regexp
end
# :api: private
def generatable?
@generatable && !regexp?
end
# :api: private
def allow_fixation?
@fixation
end
# :api: private
def to_s
regexp? ?
"/#{conditions[:path].source}/" :
segment_level_to_s(segments)
end
alias_method :inspect, :to_s
# Appends self to Merb::Router.routes
# :api: private
def register
@index = Merb::Router.routes.size
Merb::Router.routes << self
self
end
# Inserts self to Merb::Router.routes at the specified index.
# :api: private
def register_at(index)
@index = index
Merb::Router.routes.insert(index, self)
self
end
# Sets the route as a resource route with the given key as the
# lookup key.
# :api: private
def resource=(key)
Router.resource_routes[key] = self
key
end
# :api: private
def name=(name)
@name = name.to_sym
Router.named_routes[@name] = self
@name
end
# Generates the URL for the route given the passed arguments. The
# method will first match the anonymous parameters to route params
# and will convert all the parameters according to the specifed
# object identifiers.
#
# Then the named parameters are passed to a compiled generation proc.
#
# ==== Parameters
# args<Array>::
# The arguments passed to the public #url method with the name
# of the route removed. This is an array of the anonymous parameters
# followed by a hash containing the named parameters.
#
# defaults<Hash>::
# A hash of parameters to use to generate the route if there are
# any missing required parameters. This is usually the parameters
# for the current request
#
# ==== Returns
# String:: The generated URL.
#
# :api: private
def generate(args = [], defaults = {}, resource = false)
unless generatable?
raise GenerationError, "Cannot generate regexp Routes" if regexp?
raise GenerationError, "Cannot generate this route"
end
params = extract_options_from_args!(args) || { }
# Duplicating to avoid mutating arguments
params = params ? params.dup : {}
params.each do |k, v|
params[k] = identify(v, k)
end
# Support for anonymous params
unless args.empty?
# First, let's determine which variables are missing
variables = (resource ? @resource_identifiers : @variables) - params.keys
args.each do |param|
raise GenerationError, "The route has #{@variables.length} variables: #{@variables.inspect}" if variables.empty?
if identifier = identifier_for(param) and identifier.is_a?(Array)
identifier.each { |ident| params[variables.shift] = param.send(ident) }
else
params[variables.shift] ||= identify(param)
end
end
end
uri = @generator[params, defaults] or raise GenerationError, "Named route #{name} could not be generated with #{params.inspect}"
uri = Merb::Config[:path_prefix] + uri if Merb::Config[:path_prefix]
uri
end
# Identifies the object according to the identifiers set while building
# the routes. Identifying an object means picking an instance method to
# call on the object that will return a string representation of the
# object for the route being generated. If the identifier is an array,
# then a param_key must be present and match one of the elements of the
# identifier array.
#
# param_keys that end in _id are treated slightly differently in order
# to get nested resources to work correctly.
#
# :api: private
def identify(obj, param_key = nil)
identifier = identifier_for(obj)
if identifier.is_a?(Array)
# First check if the param_key exists as an identifier
return obj.send(param_key) if identifier.include?(param_key)
# If the param_key ends in _id, just return the object id
return obj.id if "#{param_key}" =~ /_id$/
# Otherwise, raise an error
raise GenerationError, "The object #{obj.inspect} cannot be identified with #{identifier.inspect} for #{param_key}"
else
identifier ? obj.send(identifier) : obj
end
end
# Returns the identifier for the passed object. Built in core ruby classes are
# always identified with to_s. The method will return nil in that case (since
# to_s is the default for objects that do not have identifiers.)
#
# :api: private
def identifier_for(obj)
return if obj.is_a?(String) || obj.is_a?(Symbol) || obj.is_a?(Numeric) ||
obj.is_a?(TrueClass) || obj.is_a?(FalseClass) || obj.is_a?(NilClass) ||
obj.is_a?(Array) || obj.instance_of?(Hash)
@identifiers.each do |klass, identifier|
return identifier if obj.is_a?(klass)
end
return nil
end
# Returns the if statement and return value for for the main
# Router.match compiled method.
#
# :api: private
def compiled_statement(first)
els_if = first ? ' if ' : ' elsif '
code = ""
code << els_if << condition_statements.join(" && ") << "\n"
# First, we need to always return the value of the
# deferred block if it explicitly matched the route
if @redirects
code << " return [#{@index.inspect}, block_result] if request.matched?" << "\n" if @deferred_procs.any?
code << " [#{@index.inspect}, Merb::Rack::Helpers.redirect(#{@redirect_url.inspect}, :status => #{@redirect_status.inspect})]" << "\n"
elsif @deferred_procs.any?
code << " [#{@index.inspect}, block_result]" << "\n"
else
code << " [#{@index.inspect}, #{params_as_string}]" << "\n"
end
end
private
# === Compilation ===
# :api: private
def compile
compile_conditions
compile_params
@generator = Generator.new(@segments, @symbol_conditions, @identifiers).compiled
end
# The Generator class handles compiling the route down to a lambda that
# can generate the URL from a params hash and a default params hash.
class Generator #:nodoc:
# :api: private
def initialize(segments, symbol_conditions, identifiers)
@segments = segments
@symbol_conditions = symbol_conditions
@identifiers = identifiers
@stack = []
@opt_segment_count = 0
@opt_segment_stack = [[]]
end
#
# :api: private
def compiled
ruby = ""
ruby << "lambda do |params, defaults|\n"
ruby << " fragment = params.delete(:anchor) || params.delete(:fragment)\n"
ruby << " query_params = params.dup\n"
with(@segments) do
ruby << " include_defaults = true\n"
ruby << " return unless url = #{block_for_level}\n"
end
ruby << " query_params.delete_if { |key, value| value.nil? }\n"
ruby << " unless query_params.empty?\n"
ruby << ' url << "?#{Merb::Parse.params_to_query_string(query_params)}"' << "\n"
ruby << " end\n"
ruby << ' url << "##{fragment}" if fragment' << "\n"
ruby << " url\n"
ruby << "end\n"
eval(ruby)
end
private
# Cleans up methods a bunch. We don't need to pass the current segment
# level around everywhere anymore. It's kept track for us in the stack.
#
# :api: private
def with(segments, &block)
@stack.push(segments)
retval = yield
@stack.pop
retval
end
# :api: private
def segments
@stack.last || []
end
# :api: private
def symbol_segments
segments.flatten.select { |s| s.is_a?(Symbol) }
end
# :api: private
def current_segments
segments.select { |s| s.is_a?(Symbol) }
end
# :api: private
def nested_segments
segments.select { |s| s.is_a?(Array) }.flatten.select { |s| s.is_a?(Symbol) }
end
# :api: private
def block_for_level
ruby = ""
ruby << "if #{segment_level_matches_conditions}\n"
ruby << " #{remove_used_segments_in_query_path}\n"
ruby << " #{generate_optional_segments}\n"
ruby << %{ "#{combine_required_and_optional_segments}"\n}
ruby << "end"
end
# :api: private
def check_if_defaults_should_be_included
ruby = ""
ruby << "include_defaults = "
symbol_segments.each { |s| ruby << "params[#{s.inspect}] || " }
ruby << "false"
end
# --- Not so pretty ---
# :api: private
def segment_level_matches_conditions
conditions = current_segments.map do |segment|
condition = "(cached_#{segment} = params[#{segment.inspect}] || include_defaults && defaults[#{segment.inspect}])"
if @symbol_conditions[segment] && @symbol_conditions[segment].is_a?(Regexp)
condition << " && cached_#{segment}.to_s =~ #{@symbol_conditions[segment].inspect}"
elsif @symbol_conditions[segment]
condition << " && cached_#{segment}.to_s == #{@symbol_conditions[segment].inspect}"
end
condition
end
conditions << "true" if conditions.empty?
conditions.join(" && ")
end
# :api: private
def remove_used_segments_in_query_path
"#{current_segments.inspect}.each { |s| query_params.delete(s) }"
end
# :api: private
def generate_optional_segments
optionals = []
segments.each_with_index do |segment, i|
if segment.is_a?(Array) && segment.any? { |s| !s.is_a?(String) }
with(segment) do
@opt_segment_stack.last << (optional_name = "_optional_segments_#{@opt_segment_count += 1}")
@opt_segment_stack.push []
optionals << "#{check_if_defaults_should_be_included}\n"
optionals << "#{optional_name} = #{block_for_level}"
@opt_segment_stack.pop
end
end
end
optionals.join("\n")
end
# :api: private
def combine_required_and_optional_segments
bits = ""
segments.each_with_index do |segment, i|
bits << case
when segment.is_a?(String) then segment
when segment.is_a?(Symbol) then '#{cached_' + segment.to_s + '}'
when segment.is_a?(Array) && segment.any? { |s| !s.is_a?(String) } then "\#{#{@opt_segment_stack.last.shift}}"
else ""
end
end
bits
end
end
# === Conditions ===
# :api: private
def compile_conditions
@original_conditions = conditions.dup
if conditions[:path] && !conditions[:path].empty?
path = conditions[:path].flatten.compact
if path = compile_path(path)
conditions[:path] = Regexp.new("^#{path}$")
else
conditions.delete(:path)
end
else
# If there is no path, we can't generate it
@generatable = false
end
end
# The path is passed in as an array of different parts. We basically have
# to concat all the parts together, then parse the path and extract the
# variables. However, if any of the parts are a regular expression, then
# we abort the parsing and just convert it to a regexp.
#
# :api: private
def compile_path(path)
@segments = []
compiled = ""
return nil if path.nil? || path.empty?
path.each do |part|
case part
when Regexp
@regexp = true
@segments = []
compiled << part.source.sub(/^\^/, '').sub(/\$$/, '')
when String
segments = segments_with_optionals_from_string(part.dup)
compile_path_segments(compiled, segments)
# Concat the segments
unless regexp?
if @segments[-1].is_a?(String) && segments[0].is_a?(String)
@segments[-1] << segments.shift
end
@segments.concat segments
end
else
raise ArgumentError.new("A route path can only be specified as a String or Regexp")
end
end
unless regexp?
@variables = @segments.flatten.select { |s| s.is_a?(Symbol) }
compiled.gsub!(%r[/+], '/')
compiled.gsub!(%r[(.+)/$], '\1')
end
compiled
end
# Simple nested parenthesis parser
#
# :api: private
def segments_with_optionals_from_string(path, nest_level = 0)
segments = []
# Extract all the segments at this parenthesis level
while segment = path.slice!(OPTIONAL_SEGMENT_REGEX)
# Append the segments that we came across so far
# at this level
segments.concat segments_from_string(segment[0..-2]) if segment.length > 1
# If the parenthesis that we came across is an opening
# then we need to jump to the higher level
if segment[-1,1] == '('
segments << segments_with_optionals_from_string(path, nest_level + 1)
else
# Throw an error if we can't actually go back down (aka syntax error)
raise "There are too many closing parentheses" if nest_level == 0
return segments
end
end
# Save any last bit of the string that didn't match the original regex
segments.concat segments_from_string(path) unless path.empty?
# Throw an error if the string should not actually be done (aka syntax error)
raise "You have too many opening parentheses" unless nest_level == 0
segments
end
# :api: private
def segments_from_string(path)
segments = []
while match = (path.match(SEGMENT_REGEXP))
segments << match.pre_match unless match.pre_match.empty?
segments << match[2].intern
path = match.post_match
end
raise Router::Behavior::Error, "cannot use :path as a route placeholder" if segments.include?(:path)
segments << path unless path.empty?
segments
end
# --- Yeah, this could probably be refactored
# :api: private
def compile_path_segments(compiled, segments)
segments.each do |segment|
case segment
when String
compiled << Regexp.escape(segment)
when Symbol
condition = (@symbol_conditions[segment] ||= @conditions.delete(segment))
compiled << compile_segment_condition(condition)
# Create a param for the Symbol segment if none already exists
@params[segment] = "#{segment.inspect}" unless @params.has_key?(segment)
@placeholders[segment] ||= capturing_parentheses_count(compiled)
when Array
compiled << "(?:"
compile_path_segments(compiled, segment)
compiled << ")?"
else
raise ArgumentError, "conditions[:path] segments can only be a Strings, Symbols, or Arrays"
end
end
end
# Handles anchors in Regexp conditions
# :api: private
def compile_segment_condition(condition)
return "(#{SEGMENT_CHARACTERS}+)" unless condition
return "(#{condition})" unless condition.is_a?(Regexp)
condition = condition.source
# Handle the start anchor
condition = if condition =~ /^\^/
condition[1..-1]
else
"#{SEGMENT_CHARACTERS}*#{condition}"
end
# Handle the end anchor
condition = if condition =~ /\$$/
condition[0..-2]
else
"#{condition}#{SEGMENT_CHARACTERS}*"
end
"(#{condition})"
end
# :api: private
def compile_params
# Loop through each param and compile it
@defaults.merge(@params).each do |key, value|
if value.nil?
@params.delete(key)
elsif value.is_a?(String)
@params[key] = compile_param(value)
else
@params[key] = value.inspect
end
end
end
# This was pretty much a copy / paste from the old router
# :api: private
def compile_param(value)
result = []
match = true
while match
if match = SEGMENT_REGEXP_WITH_BRACKETS.match(value)
result << match.pre_match.inspect unless match.pre_match.empty?
placeholder_key = match[1][1..-1].intern
if match[2] # has brackets, e.g. :path[2]
result << "#{placeholder_key}#{match[3]}"
else # no brackets, e.g. a named placeholder such as :controller
if place = @placeholders[placeholder_key]
# result << "(path#{place} || )" # <- Defaults
with_defaults = ["(path#{place}"]
with_defaults << " || #{@defaults[placeholder_key].inspect}" if @defaults[placeholder_key]
with_defaults << ")"
result << with_defaults.join
else
raise GenerationError, "Placeholder not found while compiling routes: #{placeholder_key.inspect}. Add it to the conditions part of the route."
end
end
value = match.post_match
elsif match = JUST_BRACKETS.match(value)
result << match.pre_match.inspect unless match.pre_match.empty?
result << "path#{match[1]}"
value = match.post_match
else
result << value.inspect unless value.empty?
end
end
result.join(' + ').gsub("\\_", "_")
end
# :api: private
def condition_statements
statements = []
# First, let's build the conditions for the regular
conditions.each_pair do |key, value|
statements << case value
when Regexp
captures = ""
if (max = capturing_parentheses_count(value)) > 0
captures << (1..max).to_a.map { |n| "#{key}#{n} = $#{n}" }.join("; ")
end
# Note: =~ is slightly faster than .match
%{(#{value.inspect} =~ cached_#{key} #{' && ((' + captures + ') || true)' unless captures.empty?})}
when Array
%{(#{arrays_to_regexps(value).inspect} =~ cached_#{key})}
else
%{(cached_#{key} == #{value.inspect})}
end
end
# The first one is special, so let's extract it
if first = @deferred_procs.first
deferred = ""
deferred << "(block_result = "
deferred << "request._process_block_return("
deferred << "#{first}.call(request, #{params_as_string})"
deferred << ")"
deferred << ")"
# Let's build the rest of them now
if @deferred_procs.length > 1
deferred << deferred_condition_statement(@deferred_procs[1..-1])
end
statements << deferred
end
statements
end
# (request.matched? || ((block_result = process(proc.call))))
# :api: private
def deferred_condition_statement(deferred)
if current = deferred.first
html = " && (request.matched? || ("
html << "(block_result = "
html << "request._process_block_return("
html << "#{current}.call(request, block_result)"
html << ")"
html << ")"
html << "#{deferred_condition_statement(deferred[1..-1])}"
html << "))"
end
end
# :api: private
def params_as_string
elements = params.keys.map do |k|
"#{k.inspect} => #{params[k]}"
end
"{#{elements.join(', ')}}"
end
# ---------- Utilities ----------
# :api: private
def arrays_to_regexps(condition)
return condition unless condition.is_a?(Array)
source = condition.map do |value|
value = if value.is_a?(Regexp)
value.source
else
"^#{Regexp.escape(value.to_s)}$"
end
"(?:#{value})"
end
Regexp.compile(source.join('|'))
end
# :api: private
def segment_level_to_s(segments)
(segments || []).inject('') do |str, seg|
str << case seg
when String then seg
when Symbol then ":#{seg}"
when Array then "(#{segment_level_to_s(seg)})"
end
end
end
# :api: private
def capturing_parentheses_count(regexp)
regexp = regexp.source if regexp.is_a?(Regexp)
regexp.scan(/(?!\\)[(](?!\?[#=:!>-imx])/).length
end
end
end
end
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