class Rack::Mount::RegexpWithNamedGroups

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]+)/

Public Class Methods

new(regexp) click to toggle source

Wraps Regexp with named capture support.

Calls superclass method
# File lib/rack/mount/regexp_with_named_groups.rb, line 30
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

Public Instance Methods

eql?(other) click to toggle source
Calls superclass method
# File lib/rack/mount/regexp_with_named_groups.rb, line 64
def eql?(other)
  super && @names.eql?(other.names)
end
named_captures() click to toggle source
# File lib/rack/mount/regexp_with_named_groups.rb, line 56
def named_captures
  named_captures = {}
  names.each_with_index { |n, i|
    named_captures[n] = [i+1] if n
  }
  named_captures
end
names() click to toggle source
# File lib/rack/mount/regexp_with_named_groups.rb, line 52
def names
  @names.dup
end