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module Rack::Mount
if Regin.regexp_supports_named_captures?
RegexpWithNamedGroups = Regexp
else
require 'strscan'
# A wrapper that adds shim named capture support to older
# versions of Ruby.
#
# Because the named capture syntax causes a parse error, an
# alternate syntax is used to indicate named captures.
#
# Ruby 1.9+ named capture syntax:
#
# /(?<foo>[a-z]+)/
#
# Ruby 1.8 shim syntax:
#
# /(?:<foo>[a-z]+)/
class RegexpWithNamedGroups < Regexp
def self.new(regexp) #:nodoc:
if regexp.is_a?(RegexpWithNamedGroups)
regexp
else
super
end
end
# Wraps Regexp with named capture support.
def initialize(regexp)
regexp = Regexp.compile(regexp) unless regexp.is_a?(Regexp)
source, options = regexp.source, regexp.options
@names, scanner = [], StringScanner.new(source)
while scanner.skip_until(/\(/)
if scanner.scan(/\?:<([^>]+)>/)
@names << scanner[1]
elsif scanner.scan(/\?(i?m?x?\-?i?m?x?)?:/)
# ignore noncapture
else
@names << nil
end
end
source.gsub!(/\?:<([^>]+)>/, '')
@names = [] unless @names.any?
@names.freeze
super(source, options)
end
def names
@names.dup
end
def named_captures
named_captures = {}
names.each_with_index { |n, i|
named_captures[n] = [i+1] if n
}
named_captures
end
def eql?(other)
super && @names.eql?(other.names)
end
end
end
end
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