rubyserif

module JavaScript
    class Object
        def initialize(hash={}, constants=[]) #Put keys into constants that you want to be read only
            @hash,@constants=hash,constants
        end
        def method_missing(name, *args, &block)
            if name.to_s =~ /=$/
                if @constants.include? name.to_s.sub(/=/,'').to_sym
                    raise Exception.new "Cannot modify object constant - #{name.to_s.sub(/=/,'')}"
                end
                @hash[name.to_s.sub(/=/,'').to_sym] = ((args==[]) ? ((block.nil?) ? nil : block) : args[0])
            elsif name =~ /^\/(.+?)$/
                method(:"/").call($1.to_sym) #/
            else
                return @hash[name]
            end
        end
        define_singleton_method(:"/") do |args=:elements|
            case args
            when :elements
                return @hash.keys
            when :constants
                return @constants
            else
                return nil
            end
        end
    end

    class Function
        def initialize(&code)
            @code = code
        end

        def [](*args)
            i='a'; string=''
            while(arg = args.shift)
                @temp = {}
                eval "@temp[:#{i}] = arg"
                string << ", @temp[:#{i}]"
                i.next!
            end
            string.sub!(/\,/,'')
            eval "@code.call #{string}"
            @temp = nil
        end
    end
end

__END__

[1] pry(main)> require 'rubyserif'
=> true
[2] pry(main)> k = JavaScript::Object.new({:foo => 'bar', :constant => 'not easily changed'}, [:constant])
=> #<JavaScript::Object:0x000000024536c8
 @constants=[:constant],
 @hash={:foo=>"bar", :constant=>"not easily changed"}>
[3] pry(main)> k.foo
=> "bar"
[4] pry(main)> k.foo = 'foobar'
=> "foobar"
[5] pry(main)> k.new_element = :hello
=> :hello
[6] pry(main)> k/:elements
=> [:foo, :constant, :new_element]
[7] pry(main)> k/:constants
=> [:constant]
[8] pry(main)> k.constant = 'lol'
Exception: Cannot modify object constant - constant
from /var/lib/gems/1.9.1/gems/rubyserif-0.1/lib/rubyserif.rb:11:in `method_missing'