Add List#[] method for checking whether a rule exists in the list

[postmodern]

I would like to query the default list to determine if a domain wildcard rule is actually a public suffix rule.

list['*.wired.com']
# => nil

list['*.com']
# => #<PublicSuffix::Rule::Normal:0x007f9870738bc8 @name="com", @value="com", @type=:normal, @labels=["com"]>

[weppos]

This is tricky, as the list is not stored in a simple Hash (to increase the lookup performance). However, the request makes sense.

I'll see what I can do.

[gam3]

It is not quite clear to me what the API you are looking for, but this is close. Maybe you could tell me more.

#!/usr/bin/env ruby

require 'public_suffix'

module PublicSuffix
  class List
    def [](x)
      myhash = Hash.new
      x.split(DOT).reverse[0..0].each do |p|
        if @indexes.include?(p)
          @indexes[p].each do |r|
            if @rules[r].wildcard?
              myhash['*.' + @rules[r].value] = @rules[r]
            else
              myhash['' + @rules[r].value] = @rules[r]
            end
          end
        end
      end
      myhash[x] || nil
    end
  end
end


list = PublicSuffix::List.default

%w(as com wired.com *.api.githubcloud.com compute.amazonaws.com).each do |name|
  puts "#{name} #{list[name].inspect}"
end

[weppos]

Closing, as you can currently take advantage of the Rule#each returning an Enumerator.

PublicSuffix::List.default.each.find { |r| r.rule == "*.wired.com" }
# => nil
PublicSuffix::List.default.each.find { |r| r.rule == "com" }
# => #<PublicSuffix::Rule::Normal:0x00007fe049034040 @value="com", @length=1, @private=false>